1 //===-- SelectionDAG.cpp - Implement the SelectionDAG data structures -----===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This implements the SelectionDAG class.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/CodeGen/SelectionDAG.h"
15 #include "SDNodeOrdering.h"
16 #include "SDNodeDbgValue.h"
17 #include "llvm/Constants.h"
18 #include "llvm/Analysis/DebugInfo.h"
19 #include "llvm/Analysis/ValueTracking.h"
20 #include "llvm/Function.h"
21 #include "llvm/GlobalAlias.h"
22 #include "llvm/GlobalVariable.h"
23 #include "llvm/Intrinsics.h"
24 #include "llvm/DerivedTypes.h"
25 #include "llvm/Assembly/Writer.h"
26 #include "llvm/CallingConv.h"
27 #include "llvm/CodeGen/MachineBasicBlock.h"
28 #include "llvm/CodeGen/MachineConstantPool.h"
29 #include "llvm/CodeGen/MachineFrameInfo.h"
30 #include "llvm/CodeGen/MachineModuleInfo.h"
31 #include "llvm/CodeGen/PseudoSourceValue.h"
32 #include "llvm/Target/TargetRegisterInfo.h"
33 #include "llvm/Target/TargetData.h"
34 #include "llvm/Target/TargetLowering.h"
35 #include "llvm/Target/TargetSelectionDAGInfo.h"
36 #include "llvm/Target/TargetOptions.h"
37 #include "llvm/Target/TargetInstrInfo.h"
38 #include "llvm/Target/TargetIntrinsicInfo.h"
39 #include "llvm/Target/TargetMachine.h"
40 #include "llvm/Support/CommandLine.h"
41 #include "llvm/Support/Debug.h"
42 #include "llvm/Support/ErrorHandling.h"
43 #include "llvm/Support/ManagedStatic.h"
44 #include "llvm/Support/MathExtras.h"
45 #include "llvm/Support/raw_ostream.h"
46 #include "llvm/Support/Mutex.h"
47 #include "llvm/ADT/SetVector.h"
48 #include "llvm/ADT/SmallPtrSet.h"
49 #include "llvm/ADT/SmallSet.h"
50 #include "llvm/ADT/SmallVector.h"
51 #include "llvm/ADT/StringExtras.h"
56 /// makeVTList - Return an instance of the SDVTList struct initialized with the
57 /// specified members.
58 static SDVTList makeVTList(const EVT *VTs, unsigned NumVTs) {
59 SDVTList Res = {VTs, NumVTs};
63 static const fltSemantics *EVTToAPFloatSemantics(EVT VT) {
64 switch (VT.getSimpleVT().SimpleTy) {
65 default: llvm_unreachable("Unknown FP format");
66 case MVT::f32: return &APFloat::IEEEsingle;
67 case MVT::f64: return &APFloat::IEEEdouble;
68 case MVT::f80: return &APFloat::x87DoubleExtended;
69 case MVT::f128: return &APFloat::IEEEquad;
70 case MVT::ppcf128: return &APFloat::PPCDoubleDouble;
74 SelectionDAG::DAGUpdateListener::~DAGUpdateListener() {}
76 //===----------------------------------------------------------------------===//
77 // ConstantFPSDNode Class
78 //===----------------------------------------------------------------------===//
80 /// isExactlyValue - We don't rely on operator== working on double values, as
81 /// it returns true for things that are clearly not equal, like -0.0 and 0.0.
82 /// As such, this method can be used to do an exact bit-for-bit comparison of
83 /// two floating point values.
84 bool ConstantFPSDNode::isExactlyValue(const APFloat& V) const {
85 return getValueAPF().bitwiseIsEqual(V);
88 bool ConstantFPSDNode::isValueValidForType(EVT VT,
90 assert(VT.isFloatingPoint() && "Can only convert between FP types");
92 // PPC long double cannot be converted to any other type.
93 if (VT == MVT::ppcf128 ||
94 &Val.getSemantics() == &APFloat::PPCDoubleDouble)
97 // convert modifies in place, so make a copy.
98 APFloat Val2 = APFloat(Val);
100 (void) Val2.convert(*EVTToAPFloatSemantics(VT), APFloat::rmNearestTiesToEven,
105 //===----------------------------------------------------------------------===//
107 //===----------------------------------------------------------------------===//
109 /// isBuildVectorAllOnes - Return true if the specified node is a
110 /// BUILD_VECTOR where all of the elements are ~0 or undef.
111 bool ISD::isBuildVectorAllOnes(const SDNode *N) {
112 // Look through a bit convert.
113 if (N->getOpcode() == ISD::BITCAST)
114 N = N->getOperand(0).getNode();
116 if (N->getOpcode() != ISD::BUILD_VECTOR) return false;
118 unsigned i = 0, e = N->getNumOperands();
120 // Skip over all of the undef values.
121 while (i != e && N->getOperand(i).getOpcode() == ISD::UNDEF)
124 // Do not accept an all-undef vector.
125 if (i == e) return false;
127 // Do not accept build_vectors that aren't all constants or which have non-~0
129 SDValue NotZero = N->getOperand(i);
130 if (isa<ConstantSDNode>(NotZero)) {
131 if (!cast<ConstantSDNode>(NotZero)->isAllOnesValue())
133 } else if (isa<ConstantFPSDNode>(NotZero)) {
134 if (!cast<ConstantFPSDNode>(NotZero)->getValueAPF().
135 bitcastToAPInt().isAllOnesValue())
140 // Okay, we have at least one ~0 value, check to see if the rest match or are
142 for (++i; i != e; ++i)
143 if (N->getOperand(i) != NotZero &&
144 N->getOperand(i).getOpcode() != ISD::UNDEF)
150 /// isBuildVectorAllZeros - Return true if the specified node is a
151 /// BUILD_VECTOR where all of the elements are 0 or undef.
152 bool ISD::isBuildVectorAllZeros(const SDNode *N) {
153 // Look through a bit convert.
154 if (N->getOpcode() == ISD::BITCAST)
155 N = N->getOperand(0).getNode();
157 if (N->getOpcode() != ISD::BUILD_VECTOR) return false;
159 unsigned i = 0, e = N->getNumOperands();
161 // Skip over all of the undef values.
162 while (i != e && N->getOperand(i).getOpcode() == ISD::UNDEF)
165 // Do not accept an all-undef vector.
166 if (i == e) return false;
168 // Do not accept build_vectors that aren't all constants or which have non-0
170 SDValue Zero = N->getOperand(i);
171 if (isa<ConstantSDNode>(Zero)) {
172 if (!cast<ConstantSDNode>(Zero)->isNullValue())
174 } else if (isa<ConstantFPSDNode>(Zero)) {
175 if (!cast<ConstantFPSDNode>(Zero)->getValueAPF().isPosZero())
180 // Okay, we have at least one 0 value, check to see if the rest match or are
182 for (++i; i != e; ++i)
183 if (N->getOperand(i) != Zero &&
184 N->getOperand(i).getOpcode() != ISD::UNDEF)
189 /// isScalarToVector - Return true if the specified node is a
190 /// ISD::SCALAR_TO_VECTOR node or a BUILD_VECTOR node where only the low
191 /// element is not an undef.
192 bool ISD::isScalarToVector(const SDNode *N) {
193 if (N->getOpcode() == ISD::SCALAR_TO_VECTOR)
196 if (N->getOpcode() != ISD::BUILD_VECTOR)
198 if (N->getOperand(0).getOpcode() == ISD::UNDEF)
200 unsigned NumElems = N->getNumOperands();
203 for (unsigned i = 1; i < NumElems; ++i) {
204 SDValue V = N->getOperand(i);
205 if (V.getOpcode() != ISD::UNDEF)
211 /// getSetCCSwappedOperands - Return the operation corresponding to (Y op X)
212 /// when given the operation for (X op Y).
213 ISD::CondCode ISD::getSetCCSwappedOperands(ISD::CondCode Operation) {
214 // To perform this operation, we just need to swap the L and G bits of the
216 unsigned OldL = (Operation >> 2) & 1;
217 unsigned OldG = (Operation >> 1) & 1;
218 return ISD::CondCode((Operation & ~6) | // Keep the N, U, E bits
219 (OldL << 1) | // New G bit
220 (OldG << 2)); // New L bit.
223 /// getSetCCInverse - Return the operation corresponding to !(X op Y), where
224 /// 'op' is a valid SetCC operation.
225 ISD::CondCode ISD::getSetCCInverse(ISD::CondCode Op, bool isInteger) {
226 unsigned Operation = Op;
228 Operation ^= 7; // Flip L, G, E bits, but not U.
230 Operation ^= 15; // Flip all of the condition bits.
232 if (Operation > ISD::SETTRUE2)
233 Operation &= ~8; // Don't let N and U bits get set.
235 return ISD::CondCode(Operation);
239 /// isSignedOp - For an integer comparison, return 1 if the comparison is a
240 /// signed operation and 2 if the result is an unsigned comparison. Return zero
241 /// if the operation does not depend on the sign of the input (setne and seteq).
242 static int isSignedOp(ISD::CondCode Opcode) {
244 default: llvm_unreachable("Illegal integer setcc operation!");
246 case ISD::SETNE: return 0;
250 case ISD::SETGE: return 1;
254 case ISD::SETUGE: return 2;
258 /// getSetCCOrOperation - Return the result of a logical OR between different
259 /// comparisons of identical values: ((X op1 Y) | (X op2 Y)). This function
260 /// returns SETCC_INVALID if it is not possible to represent the resultant
262 ISD::CondCode ISD::getSetCCOrOperation(ISD::CondCode Op1, ISD::CondCode Op2,
264 if (isInteger && (isSignedOp(Op1) | isSignedOp(Op2)) == 3)
265 // Cannot fold a signed integer setcc with an unsigned integer setcc.
266 return ISD::SETCC_INVALID;
268 unsigned Op = Op1 | Op2; // Combine all of the condition bits.
270 // If the N and U bits get set then the resultant comparison DOES suddenly
271 // care about orderedness, and is true when ordered.
272 if (Op > ISD::SETTRUE2)
273 Op &= ~16; // Clear the U bit if the N bit is set.
275 // Canonicalize illegal integer setcc's.
276 if (isInteger && Op == ISD::SETUNE) // e.g. SETUGT | SETULT
279 return ISD::CondCode(Op);
282 /// getSetCCAndOperation - Return the result of a logical AND between different
283 /// comparisons of identical values: ((X op1 Y) & (X op2 Y)). This
284 /// function returns zero if it is not possible to represent the resultant
286 ISD::CondCode ISD::getSetCCAndOperation(ISD::CondCode Op1, ISD::CondCode Op2,
288 if (isInteger && (isSignedOp(Op1) | isSignedOp(Op2)) == 3)
289 // Cannot fold a signed setcc with an unsigned setcc.
290 return ISD::SETCC_INVALID;
292 // Combine all of the condition bits.
293 ISD::CondCode Result = ISD::CondCode(Op1 & Op2);
295 // Canonicalize illegal integer setcc's.
299 case ISD::SETUO : Result = ISD::SETFALSE; break; // SETUGT & SETULT
300 case ISD::SETOEQ: // SETEQ & SETU[LG]E
301 case ISD::SETUEQ: Result = ISD::SETEQ ; break; // SETUGE & SETULE
302 case ISD::SETOLT: Result = ISD::SETULT ; break; // SETULT & SETNE
303 case ISD::SETOGT: Result = ISD::SETUGT ; break; // SETUGT & SETNE
310 //===----------------------------------------------------------------------===//
311 // SDNode Profile Support
312 //===----------------------------------------------------------------------===//
314 /// AddNodeIDOpcode - Add the node opcode to the NodeID data.
316 static void AddNodeIDOpcode(FoldingSetNodeID &ID, unsigned OpC) {
320 /// AddNodeIDValueTypes - Value type lists are intern'd so we can represent them
321 /// solely with their pointer.
322 static void AddNodeIDValueTypes(FoldingSetNodeID &ID, SDVTList VTList) {
323 ID.AddPointer(VTList.VTs);
326 /// AddNodeIDOperands - Various routines for adding operands to the NodeID data.
328 static void AddNodeIDOperands(FoldingSetNodeID &ID,
329 const SDValue *Ops, unsigned NumOps) {
330 for (; NumOps; --NumOps, ++Ops) {
331 ID.AddPointer(Ops->getNode());
332 ID.AddInteger(Ops->getResNo());
336 /// AddNodeIDOperands - Various routines for adding operands to the NodeID data.
338 static void AddNodeIDOperands(FoldingSetNodeID &ID,
339 const SDUse *Ops, unsigned NumOps) {
340 for (; NumOps; --NumOps, ++Ops) {
341 ID.AddPointer(Ops->getNode());
342 ID.AddInteger(Ops->getResNo());
346 static void AddNodeIDNode(FoldingSetNodeID &ID,
347 unsigned short OpC, SDVTList VTList,
348 const SDValue *OpList, unsigned N) {
349 AddNodeIDOpcode(ID, OpC);
350 AddNodeIDValueTypes(ID, VTList);
351 AddNodeIDOperands(ID, OpList, N);
354 /// AddNodeIDCustom - If this is an SDNode with special info, add this info to
356 static void AddNodeIDCustom(FoldingSetNodeID &ID, const SDNode *N) {
357 switch (N->getOpcode()) {
358 case ISD::TargetExternalSymbol:
359 case ISD::ExternalSymbol:
360 llvm_unreachable("Should only be used on nodes with operands");
361 default: break; // Normal nodes don't need extra info.
362 case ISD::TargetConstant:
364 ID.AddPointer(cast<ConstantSDNode>(N)->getConstantIntValue());
366 case ISD::TargetConstantFP:
367 case ISD::ConstantFP: {
368 ID.AddPointer(cast<ConstantFPSDNode>(N)->getConstantFPValue());
371 case ISD::TargetGlobalAddress:
372 case ISD::GlobalAddress:
373 case ISD::TargetGlobalTLSAddress:
374 case ISD::GlobalTLSAddress: {
375 const GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(N);
376 ID.AddPointer(GA->getGlobal());
377 ID.AddInteger(GA->getOffset());
378 ID.AddInteger(GA->getTargetFlags());
381 case ISD::BasicBlock:
382 ID.AddPointer(cast<BasicBlockSDNode>(N)->getBasicBlock());
385 ID.AddInteger(cast<RegisterSDNode>(N)->getReg());
389 ID.AddPointer(cast<SrcValueSDNode>(N)->getValue());
391 case ISD::FrameIndex:
392 case ISD::TargetFrameIndex:
393 ID.AddInteger(cast<FrameIndexSDNode>(N)->getIndex());
396 case ISD::TargetJumpTable:
397 ID.AddInteger(cast<JumpTableSDNode>(N)->getIndex());
398 ID.AddInteger(cast<JumpTableSDNode>(N)->getTargetFlags());
400 case ISD::ConstantPool:
401 case ISD::TargetConstantPool: {
402 const ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(N);
403 ID.AddInteger(CP->getAlignment());
404 ID.AddInteger(CP->getOffset());
405 if (CP->isMachineConstantPoolEntry())
406 CP->getMachineCPVal()->AddSelectionDAGCSEId(ID);
408 ID.AddPointer(CP->getConstVal());
409 ID.AddInteger(CP->getTargetFlags());
413 const LoadSDNode *LD = cast<LoadSDNode>(N);
414 ID.AddInteger(LD->getMemoryVT().getRawBits());
415 ID.AddInteger(LD->getRawSubclassData());
419 const StoreSDNode *ST = cast<StoreSDNode>(N);
420 ID.AddInteger(ST->getMemoryVT().getRawBits());
421 ID.AddInteger(ST->getRawSubclassData());
424 case ISD::ATOMIC_CMP_SWAP:
425 case ISD::ATOMIC_SWAP:
426 case ISD::ATOMIC_LOAD_ADD:
427 case ISD::ATOMIC_LOAD_SUB:
428 case ISD::ATOMIC_LOAD_AND:
429 case ISD::ATOMIC_LOAD_OR:
430 case ISD::ATOMIC_LOAD_XOR:
431 case ISD::ATOMIC_LOAD_NAND:
432 case ISD::ATOMIC_LOAD_MIN:
433 case ISD::ATOMIC_LOAD_MAX:
434 case ISD::ATOMIC_LOAD_UMIN:
435 case ISD::ATOMIC_LOAD_UMAX: {
436 const AtomicSDNode *AT = cast<AtomicSDNode>(N);
437 ID.AddInteger(AT->getMemoryVT().getRawBits());
438 ID.AddInteger(AT->getRawSubclassData());
441 case ISD::VECTOR_SHUFFLE: {
442 const ShuffleVectorSDNode *SVN = cast<ShuffleVectorSDNode>(N);
443 for (unsigned i = 0, e = N->getValueType(0).getVectorNumElements();
445 ID.AddInteger(SVN->getMaskElt(i));
448 case ISD::TargetBlockAddress:
449 case ISD::BlockAddress: {
450 ID.AddPointer(cast<BlockAddressSDNode>(N)->getBlockAddress());
451 ID.AddInteger(cast<BlockAddressSDNode>(N)->getTargetFlags());
454 } // end switch (N->getOpcode())
457 /// AddNodeIDNode - Generic routine for adding a nodes info to the NodeID
459 static void AddNodeIDNode(FoldingSetNodeID &ID, const SDNode *N) {
460 AddNodeIDOpcode(ID, N->getOpcode());
461 // Add the return value info.
462 AddNodeIDValueTypes(ID, N->getVTList());
463 // Add the operand info.
464 AddNodeIDOperands(ID, N->op_begin(), N->getNumOperands());
466 // Handle SDNode leafs with special info.
467 AddNodeIDCustom(ID, N);
470 /// encodeMemSDNodeFlags - Generic routine for computing a value for use in
471 /// the CSE map that carries volatility, temporalness, indexing mode, and
472 /// extension/truncation information.
474 static inline unsigned
475 encodeMemSDNodeFlags(int ConvType, ISD::MemIndexedMode AM, bool isVolatile,
476 bool isNonTemporal) {
477 assert((ConvType & 3) == ConvType &&
478 "ConvType may not require more than 2 bits!");
479 assert((AM & 7) == AM &&
480 "AM may not require more than 3 bits!");
484 (isNonTemporal << 6);
487 //===----------------------------------------------------------------------===//
488 // SelectionDAG Class
489 //===----------------------------------------------------------------------===//
491 /// doNotCSE - Return true if CSE should not be performed for this node.
492 static bool doNotCSE(SDNode *N) {
493 if (N->getValueType(0) == MVT::Glue)
494 return true; // Never CSE anything that produces a flag.
496 switch (N->getOpcode()) {
498 case ISD::HANDLENODE:
500 return true; // Never CSE these nodes.
503 // Check that remaining values produced are not flags.
504 for (unsigned i = 1, e = N->getNumValues(); i != e; ++i)
505 if (N->getValueType(i) == MVT::Glue)
506 return true; // Never CSE anything that produces a flag.
511 /// RemoveDeadNodes - This method deletes all unreachable nodes in the
513 void SelectionDAG::RemoveDeadNodes() {
514 // Create a dummy node (which is not added to allnodes), that adds a reference
515 // to the root node, preventing it from being deleted.
516 HandleSDNode Dummy(getRoot());
518 SmallVector<SDNode*, 128> DeadNodes;
520 // Add all obviously-dead nodes to the DeadNodes worklist.
521 for (allnodes_iterator I = allnodes_begin(), E = allnodes_end(); I != E; ++I)
523 DeadNodes.push_back(I);
525 RemoveDeadNodes(DeadNodes);
527 // If the root changed (e.g. it was a dead load, update the root).
528 setRoot(Dummy.getValue());
531 /// RemoveDeadNodes - This method deletes the unreachable nodes in the
532 /// given list, and any nodes that become unreachable as a result.
533 void SelectionDAG::RemoveDeadNodes(SmallVectorImpl<SDNode *> &DeadNodes,
534 DAGUpdateListener *UpdateListener) {
536 // Process the worklist, deleting the nodes and adding their uses to the
538 while (!DeadNodes.empty()) {
539 SDNode *N = DeadNodes.pop_back_val();
542 UpdateListener->NodeDeleted(N, 0);
544 // Take the node out of the appropriate CSE map.
545 RemoveNodeFromCSEMaps(N);
547 // Next, brutally remove the operand list. This is safe to do, as there are
548 // no cycles in the graph.
549 for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ) {
551 SDNode *Operand = Use.getNode();
554 // Now that we removed this operand, see if there are no uses of it left.
555 if (Operand->use_empty())
556 DeadNodes.push_back(Operand);
563 void SelectionDAG::RemoveDeadNode(SDNode *N, DAGUpdateListener *UpdateListener){
564 SmallVector<SDNode*, 16> DeadNodes(1, N);
565 RemoveDeadNodes(DeadNodes, UpdateListener);
568 void SelectionDAG::DeleteNode(SDNode *N) {
569 // First take this out of the appropriate CSE map.
570 RemoveNodeFromCSEMaps(N);
572 // Finally, remove uses due to operands of this node, remove from the
573 // AllNodes list, and delete the node.
574 DeleteNodeNotInCSEMaps(N);
577 void SelectionDAG::DeleteNodeNotInCSEMaps(SDNode *N) {
578 assert(N != AllNodes.begin() && "Cannot delete the entry node!");
579 assert(N->use_empty() && "Cannot delete a node that is not dead!");
581 // Drop all of the operands and decrement used node's use counts.
587 void SelectionDAG::DeallocateNode(SDNode *N) {
588 if (N->OperandsNeedDelete)
589 delete[] N->OperandList;
591 // Set the opcode to DELETED_NODE to help catch bugs when node
592 // memory is reallocated.
593 N->NodeType = ISD::DELETED_NODE;
595 NodeAllocator.Deallocate(AllNodes.remove(N));
597 // Remove the ordering of this node.
600 // If any of the SDDbgValue nodes refer to this SDNode, invalidate them.
601 SmallVector<SDDbgValue*, 2> &DbgVals = DbgInfo->getSDDbgValues(N);
602 for (unsigned i = 0, e = DbgVals.size(); i != e; ++i)
603 DbgVals[i]->setIsInvalidated();
606 /// RemoveNodeFromCSEMaps - Take the specified node out of the CSE map that
607 /// correspond to it. This is useful when we're about to delete or repurpose
608 /// the node. We don't want future request for structurally identical nodes
609 /// to return N anymore.
610 bool SelectionDAG::RemoveNodeFromCSEMaps(SDNode *N) {
612 switch (N->getOpcode()) {
613 case ISD::HANDLENODE: return false; // noop.
615 assert(CondCodeNodes[cast<CondCodeSDNode>(N)->get()] &&
616 "Cond code doesn't exist!");
617 Erased = CondCodeNodes[cast<CondCodeSDNode>(N)->get()] != 0;
618 CondCodeNodes[cast<CondCodeSDNode>(N)->get()] = 0;
620 case ISD::ExternalSymbol:
621 Erased = ExternalSymbols.erase(cast<ExternalSymbolSDNode>(N)->getSymbol());
623 case ISD::TargetExternalSymbol: {
624 ExternalSymbolSDNode *ESN = cast<ExternalSymbolSDNode>(N);
625 Erased = TargetExternalSymbols.erase(
626 std::pair<std::string,unsigned char>(ESN->getSymbol(),
627 ESN->getTargetFlags()));
630 case ISD::VALUETYPE: {
631 EVT VT = cast<VTSDNode>(N)->getVT();
632 if (VT.isExtended()) {
633 Erased = ExtendedValueTypeNodes.erase(VT);
635 Erased = ValueTypeNodes[VT.getSimpleVT().SimpleTy] != 0;
636 ValueTypeNodes[VT.getSimpleVT().SimpleTy] = 0;
641 // Remove it from the CSE Map.
642 assert(N->getOpcode() != ISD::DELETED_NODE && "DELETED_NODE in CSEMap!");
643 assert(N->getOpcode() != ISD::EntryToken && "EntryToken in CSEMap!");
644 Erased = CSEMap.RemoveNode(N);
648 // Verify that the node was actually in one of the CSE maps, unless it has a
649 // flag result (which cannot be CSE'd) or is one of the special cases that are
650 // not subject to CSE.
651 if (!Erased && N->getValueType(N->getNumValues()-1) != MVT::Glue &&
652 !N->isMachineOpcode() && !doNotCSE(N)) {
655 llvm_unreachable("Node is not in map!");
661 /// AddModifiedNodeToCSEMaps - The specified node has been removed from the CSE
662 /// maps and modified in place. Add it back to the CSE maps, unless an identical
663 /// node already exists, in which case transfer all its users to the existing
664 /// node. This transfer can potentially trigger recursive merging.
667 SelectionDAG::AddModifiedNodeToCSEMaps(SDNode *N,
668 DAGUpdateListener *UpdateListener) {
669 // For node types that aren't CSE'd, just act as if no identical node
672 SDNode *Existing = CSEMap.GetOrInsertNode(N);
674 // If there was already an existing matching node, use ReplaceAllUsesWith
675 // to replace the dead one with the existing one. This can cause
676 // recursive merging of other unrelated nodes down the line.
677 ReplaceAllUsesWith(N, Existing, UpdateListener);
679 // N is now dead. Inform the listener if it exists and delete it.
681 UpdateListener->NodeDeleted(N, Existing);
682 DeleteNodeNotInCSEMaps(N);
687 // If the node doesn't already exist, we updated it. Inform a listener if
690 UpdateListener->NodeUpdated(N);
693 /// FindModifiedNodeSlot - Find a slot for the specified node if its operands
694 /// were replaced with those specified. If this node is never memoized,
695 /// return null, otherwise return a pointer to the slot it would take. If a
696 /// node already exists with these operands, the slot will be non-null.
697 SDNode *SelectionDAG::FindModifiedNodeSlot(SDNode *N, SDValue Op,
702 SDValue Ops[] = { Op };
704 AddNodeIDNode(ID, N->getOpcode(), N->getVTList(), Ops, 1);
705 AddNodeIDCustom(ID, N);
706 SDNode *Node = CSEMap.FindNodeOrInsertPos(ID, InsertPos);
710 /// FindModifiedNodeSlot - Find a slot for the specified node if its operands
711 /// were replaced with those specified. If this node is never memoized,
712 /// return null, otherwise return a pointer to the slot it would take. If a
713 /// node already exists with these operands, the slot will be non-null.
714 SDNode *SelectionDAG::FindModifiedNodeSlot(SDNode *N,
715 SDValue Op1, SDValue Op2,
720 SDValue Ops[] = { Op1, Op2 };
722 AddNodeIDNode(ID, N->getOpcode(), N->getVTList(), Ops, 2);
723 AddNodeIDCustom(ID, N);
724 SDNode *Node = CSEMap.FindNodeOrInsertPos(ID, InsertPos);
729 /// FindModifiedNodeSlot - Find a slot for the specified node if its operands
730 /// were replaced with those specified. If this node is never memoized,
731 /// return null, otherwise return a pointer to the slot it would take. If a
732 /// node already exists with these operands, the slot will be non-null.
733 SDNode *SelectionDAG::FindModifiedNodeSlot(SDNode *N,
734 const SDValue *Ops,unsigned NumOps,
740 AddNodeIDNode(ID, N->getOpcode(), N->getVTList(), Ops, NumOps);
741 AddNodeIDCustom(ID, N);
742 SDNode *Node = CSEMap.FindNodeOrInsertPos(ID, InsertPos);
747 /// VerifyNodeCommon - Sanity check the given node. Aborts if it is invalid.
748 static void VerifyNodeCommon(SDNode *N) {
749 switch (N->getOpcode()) {
752 case ISD::BUILD_PAIR: {
753 EVT VT = N->getValueType(0);
754 assert(N->getNumValues() == 1 && "Too many results!");
755 assert(!VT.isVector() && (VT.isInteger() || VT.isFloatingPoint()) &&
756 "Wrong return type!");
757 assert(N->getNumOperands() == 2 && "Wrong number of operands!");
758 assert(N->getOperand(0).getValueType() == N->getOperand(1).getValueType() &&
759 "Mismatched operand types!");
760 assert(N->getOperand(0).getValueType().isInteger() == VT.isInteger() &&
761 "Wrong operand type!");
762 assert(VT.getSizeInBits() == 2 * N->getOperand(0).getValueSizeInBits() &&
763 "Wrong return type size");
766 case ISD::BUILD_VECTOR: {
767 assert(N->getNumValues() == 1 && "Too many results!");
768 assert(N->getValueType(0).isVector() && "Wrong return type!");
769 assert(N->getNumOperands() == N->getValueType(0).getVectorNumElements() &&
770 "Wrong number of operands!");
771 EVT EltVT = N->getValueType(0).getVectorElementType();
772 for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ++I)
773 assert((I->getValueType() == EltVT ||
774 (EltVT.isInteger() && I->getValueType().isInteger() &&
775 EltVT.bitsLE(I->getValueType()))) &&
776 "Wrong operand type!");
782 /// VerifySDNode - Sanity check the given SDNode. Aborts if it is invalid.
783 static void VerifySDNode(SDNode *N) {
784 // The SDNode allocators cannot be used to allocate nodes with fields that are
785 // not present in an SDNode!
786 assert(!isa<MemSDNode>(N) && "Bad MemSDNode!");
787 assert(!isa<ShuffleVectorSDNode>(N) && "Bad ShuffleVectorSDNode!");
788 assert(!isa<ConstantSDNode>(N) && "Bad ConstantSDNode!");
789 assert(!isa<ConstantFPSDNode>(N) && "Bad ConstantFPSDNode!");
790 assert(!isa<GlobalAddressSDNode>(N) && "Bad GlobalAddressSDNode!");
791 assert(!isa<FrameIndexSDNode>(N) && "Bad FrameIndexSDNode!");
792 assert(!isa<JumpTableSDNode>(N) && "Bad JumpTableSDNode!");
793 assert(!isa<ConstantPoolSDNode>(N) && "Bad ConstantPoolSDNode!");
794 assert(!isa<BasicBlockSDNode>(N) && "Bad BasicBlockSDNode!");
795 assert(!isa<SrcValueSDNode>(N) && "Bad SrcValueSDNode!");
796 assert(!isa<MDNodeSDNode>(N) && "Bad MDNodeSDNode!");
797 assert(!isa<RegisterSDNode>(N) && "Bad RegisterSDNode!");
798 assert(!isa<BlockAddressSDNode>(N) && "Bad BlockAddressSDNode!");
799 assert(!isa<EHLabelSDNode>(N) && "Bad EHLabelSDNode!");
800 assert(!isa<ExternalSymbolSDNode>(N) && "Bad ExternalSymbolSDNode!");
801 assert(!isa<CondCodeSDNode>(N) && "Bad CondCodeSDNode!");
802 assert(!isa<CvtRndSatSDNode>(N) && "Bad CvtRndSatSDNode!");
803 assert(!isa<VTSDNode>(N) && "Bad VTSDNode!");
804 assert(!isa<MachineSDNode>(N) && "Bad MachineSDNode!");
809 /// VerifyMachineNode - Sanity check the given MachineNode. Aborts if it is
811 static void VerifyMachineNode(SDNode *N) {
812 // The MachineNode allocators cannot be used to allocate nodes with fields
813 // that are not present in a MachineNode!
814 // Currently there are no such nodes.
820 /// getEVTAlignment - Compute the default alignment value for the
823 unsigned SelectionDAG::getEVTAlignment(EVT VT) const {
824 const Type *Ty = VT == MVT::iPTR ?
825 PointerType::get(Type::getInt8Ty(*getContext()), 0) :
826 VT.getTypeForEVT(*getContext());
828 return TLI.getTargetData()->getABITypeAlignment(Ty);
831 // EntryNode could meaningfully have debug info if we can find it...
832 SelectionDAG::SelectionDAG(const TargetMachine &tm)
833 : TM(tm), TLI(*tm.getTargetLowering()), TSI(*tm.getSelectionDAGInfo()),
834 EntryNode(ISD::EntryToken, DebugLoc(), getVTList(MVT::Other)),
835 Root(getEntryNode()), Ordering(0) {
836 AllNodes.push_back(&EntryNode);
837 Ordering = new SDNodeOrdering();
838 DbgInfo = new SDDbgInfo();
841 void SelectionDAG::init(MachineFunction &mf) {
843 Context = &mf.getFunction()->getContext();
846 SelectionDAG::~SelectionDAG() {
852 void SelectionDAG::allnodes_clear() {
853 assert(&*AllNodes.begin() == &EntryNode);
854 AllNodes.remove(AllNodes.begin());
855 while (!AllNodes.empty())
856 DeallocateNode(AllNodes.begin());
859 void SelectionDAG::clear() {
861 OperandAllocator.Reset();
864 ExtendedValueTypeNodes.clear();
865 ExternalSymbols.clear();
866 TargetExternalSymbols.clear();
867 std::fill(CondCodeNodes.begin(), CondCodeNodes.end(),
868 static_cast<CondCodeSDNode*>(0));
869 std::fill(ValueTypeNodes.begin(), ValueTypeNodes.end(),
870 static_cast<SDNode*>(0));
872 EntryNode.UseList = 0;
873 AllNodes.push_back(&EntryNode);
874 Root = getEntryNode();
879 SDValue SelectionDAG::getSExtOrTrunc(SDValue Op, DebugLoc DL, EVT VT) {
880 return VT.bitsGT(Op.getValueType()) ?
881 getNode(ISD::SIGN_EXTEND, DL, VT, Op) :
882 getNode(ISD::TRUNCATE, DL, VT, Op);
885 SDValue SelectionDAG::getZExtOrTrunc(SDValue Op, DebugLoc DL, EVT VT) {
886 return VT.bitsGT(Op.getValueType()) ?
887 getNode(ISD::ZERO_EXTEND, DL, VT, Op) :
888 getNode(ISD::TRUNCATE, DL, VT, Op);
891 SDValue SelectionDAG::getZeroExtendInReg(SDValue Op, DebugLoc DL, EVT VT) {
892 assert(!VT.isVector() &&
893 "getZeroExtendInReg should use the vector element type instead of "
895 if (Op.getValueType() == VT) return Op;
896 unsigned BitWidth = Op.getValueType().getScalarType().getSizeInBits();
897 APInt Imm = APInt::getLowBitsSet(BitWidth,
899 return getNode(ISD::AND, DL, Op.getValueType(), Op,
900 getConstant(Imm, Op.getValueType()));
903 /// getNOT - Create a bitwise NOT operation as (XOR Val, -1).
905 SDValue SelectionDAG::getNOT(DebugLoc DL, SDValue Val, EVT VT) {
906 EVT EltVT = VT.getScalarType();
908 getConstant(APInt::getAllOnesValue(EltVT.getSizeInBits()), VT);
909 return getNode(ISD::XOR, DL, VT, Val, NegOne);
912 SDValue SelectionDAG::getConstant(uint64_t Val, EVT VT, bool isT) {
913 EVT EltVT = VT.getScalarType();
914 assert((EltVT.getSizeInBits() >= 64 ||
915 (uint64_t)((int64_t)Val >> EltVT.getSizeInBits()) + 1 < 2) &&
916 "getConstant with a uint64_t value that doesn't fit in the type!");
917 return getConstant(APInt(EltVT.getSizeInBits(), Val), VT, isT);
920 SDValue SelectionDAG::getConstant(const APInt &Val, EVT VT, bool isT) {
921 return getConstant(*ConstantInt::get(*Context, Val), VT, isT);
924 SDValue SelectionDAG::getConstant(const ConstantInt &Val, EVT VT, bool isT) {
925 assert(VT.isInteger() && "Cannot create FP integer constant!");
927 EVT EltVT = VT.getScalarType();
928 assert(Val.getBitWidth() == EltVT.getSizeInBits() &&
929 "APInt size does not match type size!");
931 unsigned Opc = isT ? ISD::TargetConstant : ISD::Constant;
933 AddNodeIDNode(ID, Opc, getVTList(EltVT), 0, 0);
937 if ((N = CSEMap.FindNodeOrInsertPos(ID, IP)))
939 return SDValue(N, 0);
942 N = new (NodeAllocator) ConstantSDNode(isT, &Val, EltVT);
943 CSEMap.InsertNode(N, IP);
944 AllNodes.push_back(N);
947 SDValue Result(N, 0);
949 SmallVector<SDValue, 8> Ops;
950 Ops.assign(VT.getVectorNumElements(), Result);
951 Result = getNode(ISD::BUILD_VECTOR, DebugLoc(), VT, &Ops[0], Ops.size());
956 SDValue SelectionDAG::getIntPtrConstant(uint64_t Val, bool isTarget) {
957 return getConstant(Val, TLI.getPointerTy(), isTarget);
961 SDValue SelectionDAG::getConstantFP(const APFloat& V, EVT VT, bool isTarget) {
962 return getConstantFP(*ConstantFP::get(*getContext(), V), VT, isTarget);
965 SDValue SelectionDAG::getConstantFP(const ConstantFP& V, EVT VT, bool isTarget){
966 assert(VT.isFloatingPoint() && "Cannot create integer FP constant!");
968 EVT EltVT = VT.getScalarType();
970 // Do the map lookup using the actual bit pattern for the floating point
971 // value, so that we don't have problems with 0.0 comparing equal to -0.0, and
972 // we don't have issues with SNANs.
973 unsigned Opc = isTarget ? ISD::TargetConstantFP : ISD::ConstantFP;
975 AddNodeIDNode(ID, Opc, getVTList(EltVT), 0, 0);
979 if ((N = CSEMap.FindNodeOrInsertPos(ID, IP)))
981 return SDValue(N, 0);
984 N = new (NodeAllocator) ConstantFPSDNode(isTarget, &V, EltVT);
985 CSEMap.InsertNode(N, IP);
986 AllNodes.push_back(N);
989 SDValue Result(N, 0);
991 SmallVector<SDValue, 8> Ops;
992 Ops.assign(VT.getVectorNumElements(), Result);
993 // FIXME DebugLoc info might be appropriate here
994 Result = getNode(ISD::BUILD_VECTOR, DebugLoc(), VT, &Ops[0], Ops.size());
999 SDValue SelectionDAG::getConstantFP(double Val, EVT VT, bool isTarget) {
1000 EVT EltVT = VT.getScalarType();
1001 if (EltVT==MVT::f32)
1002 return getConstantFP(APFloat((float)Val), VT, isTarget);
1003 else if (EltVT==MVT::f64)
1004 return getConstantFP(APFloat(Val), VT, isTarget);
1005 else if (EltVT==MVT::f80 || EltVT==MVT::f128) {
1007 APFloat apf = APFloat(Val);
1008 apf.convert(*EVTToAPFloatSemantics(EltVT), APFloat::rmNearestTiesToEven,
1010 return getConstantFP(apf, VT, isTarget);
1012 assert(0 && "Unsupported type in getConstantFP");
1017 SDValue SelectionDAG::getGlobalAddress(const GlobalValue *GV, DebugLoc DL,
1018 EVT VT, int64_t Offset,
1020 unsigned char TargetFlags) {
1021 assert((TargetFlags == 0 || isTargetGA) &&
1022 "Cannot set target flags on target-independent globals");
1024 // Truncate (with sign-extension) the offset value to the pointer size.
1025 EVT PTy = TLI.getPointerTy();
1026 unsigned BitWidth = PTy.getSizeInBits();
1028 Offset = (Offset << (64 - BitWidth) >> (64 - BitWidth));
1030 const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV);
1032 // If GV is an alias then use the aliasee for determining thread-localness.
1033 if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV))
1034 GVar = dyn_cast_or_null<GlobalVariable>(GA->resolveAliasedGlobal(false));
1038 if (GVar && GVar->isThreadLocal())
1039 Opc = isTargetGA ? ISD::TargetGlobalTLSAddress : ISD::GlobalTLSAddress;
1041 Opc = isTargetGA ? ISD::TargetGlobalAddress : ISD::GlobalAddress;
1043 FoldingSetNodeID ID;
1044 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0);
1046 ID.AddInteger(Offset);
1047 ID.AddInteger(TargetFlags);
1049 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1050 return SDValue(E, 0);
1052 SDNode *N = new (NodeAllocator) GlobalAddressSDNode(Opc, DL, GV, VT,
1053 Offset, TargetFlags);
1054 CSEMap.InsertNode(N, IP);
1055 AllNodes.push_back(N);
1056 return SDValue(N, 0);
1059 SDValue SelectionDAG::getFrameIndex(int FI, EVT VT, bool isTarget) {
1060 unsigned Opc = isTarget ? ISD::TargetFrameIndex : ISD::FrameIndex;
1061 FoldingSetNodeID ID;
1062 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0);
1065 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1066 return SDValue(E, 0);
1068 SDNode *N = new (NodeAllocator) FrameIndexSDNode(FI, VT, isTarget);
1069 CSEMap.InsertNode(N, IP);
1070 AllNodes.push_back(N);
1071 return SDValue(N, 0);
1074 SDValue SelectionDAG::getJumpTable(int JTI, EVT VT, bool isTarget,
1075 unsigned char TargetFlags) {
1076 assert((TargetFlags == 0 || isTarget) &&
1077 "Cannot set target flags on target-independent jump tables");
1078 unsigned Opc = isTarget ? ISD::TargetJumpTable : ISD::JumpTable;
1079 FoldingSetNodeID ID;
1080 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0);
1082 ID.AddInteger(TargetFlags);
1084 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1085 return SDValue(E, 0);
1087 SDNode *N = new (NodeAllocator) JumpTableSDNode(JTI, VT, isTarget,
1089 CSEMap.InsertNode(N, IP);
1090 AllNodes.push_back(N);
1091 return SDValue(N, 0);
1094 SDValue SelectionDAG::getConstantPool(const Constant *C, EVT VT,
1095 unsigned Alignment, int Offset,
1097 unsigned char TargetFlags) {
1098 assert((TargetFlags == 0 || isTarget) &&
1099 "Cannot set target flags on target-independent globals");
1101 Alignment = TLI.getTargetData()->getPrefTypeAlignment(C->getType());
1102 unsigned Opc = isTarget ? ISD::TargetConstantPool : ISD::ConstantPool;
1103 FoldingSetNodeID ID;
1104 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0);
1105 ID.AddInteger(Alignment);
1106 ID.AddInteger(Offset);
1108 ID.AddInteger(TargetFlags);
1110 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1111 return SDValue(E, 0);
1113 SDNode *N = new (NodeAllocator) ConstantPoolSDNode(isTarget, C, VT, Offset,
1114 Alignment, TargetFlags);
1115 CSEMap.InsertNode(N, IP);
1116 AllNodes.push_back(N);
1117 return SDValue(N, 0);
1121 SDValue SelectionDAG::getConstantPool(MachineConstantPoolValue *C, EVT VT,
1122 unsigned Alignment, int Offset,
1124 unsigned char TargetFlags) {
1125 assert((TargetFlags == 0 || isTarget) &&
1126 "Cannot set target flags on target-independent globals");
1128 Alignment = TLI.getTargetData()->getPrefTypeAlignment(C->getType());
1129 unsigned Opc = isTarget ? ISD::TargetConstantPool : ISD::ConstantPool;
1130 FoldingSetNodeID ID;
1131 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0);
1132 ID.AddInteger(Alignment);
1133 ID.AddInteger(Offset);
1134 C->AddSelectionDAGCSEId(ID);
1135 ID.AddInteger(TargetFlags);
1137 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1138 return SDValue(E, 0);
1140 SDNode *N = new (NodeAllocator) ConstantPoolSDNode(isTarget, C, VT, Offset,
1141 Alignment, TargetFlags);
1142 CSEMap.InsertNode(N, IP);
1143 AllNodes.push_back(N);
1144 return SDValue(N, 0);
1147 SDValue SelectionDAG::getBasicBlock(MachineBasicBlock *MBB) {
1148 FoldingSetNodeID ID;
1149 AddNodeIDNode(ID, ISD::BasicBlock, getVTList(MVT::Other), 0, 0);
1152 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1153 return SDValue(E, 0);
1155 SDNode *N = new (NodeAllocator) BasicBlockSDNode(MBB);
1156 CSEMap.InsertNode(N, IP);
1157 AllNodes.push_back(N);
1158 return SDValue(N, 0);
1161 SDValue SelectionDAG::getValueType(EVT VT) {
1162 if (VT.isSimple() && (unsigned)VT.getSimpleVT().SimpleTy >=
1163 ValueTypeNodes.size())
1164 ValueTypeNodes.resize(VT.getSimpleVT().SimpleTy+1);
1166 SDNode *&N = VT.isExtended() ?
1167 ExtendedValueTypeNodes[VT] : ValueTypeNodes[VT.getSimpleVT().SimpleTy];
1169 if (N) return SDValue(N, 0);
1170 N = new (NodeAllocator) VTSDNode(VT);
1171 AllNodes.push_back(N);
1172 return SDValue(N, 0);
1175 SDValue SelectionDAG::getExternalSymbol(const char *Sym, EVT VT) {
1176 SDNode *&N = ExternalSymbols[Sym];
1177 if (N) return SDValue(N, 0);
1178 N = new (NodeAllocator) ExternalSymbolSDNode(false, Sym, 0, VT);
1179 AllNodes.push_back(N);
1180 return SDValue(N, 0);
1183 SDValue SelectionDAG::getTargetExternalSymbol(const char *Sym, EVT VT,
1184 unsigned char TargetFlags) {
1186 TargetExternalSymbols[std::pair<std::string,unsigned char>(Sym,
1188 if (N) return SDValue(N, 0);
1189 N = new (NodeAllocator) ExternalSymbolSDNode(true, Sym, TargetFlags, VT);
1190 AllNodes.push_back(N);
1191 return SDValue(N, 0);
1194 SDValue SelectionDAG::getCondCode(ISD::CondCode Cond) {
1195 if ((unsigned)Cond >= CondCodeNodes.size())
1196 CondCodeNodes.resize(Cond+1);
1198 if (CondCodeNodes[Cond] == 0) {
1199 CondCodeSDNode *N = new (NodeAllocator) CondCodeSDNode(Cond);
1200 CondCodeNodes[Cond] = N;
1201 AllNodes.push_back(N);
1204 return SDValue(CondCodeNodes[Cond], 0);
1207 // commuteShuffle - swaps the values of N1 and N2, and swaps all indices in
1208 // the shuffle mask M that point at N1 to point at N2, and indices that point
1209 // N2 to point at N1.
1210 static void commuteShuffle(SDValue &N1, SDValue &N2, SmallVectorImpl<int> &M) {
1212 int NElts = M.size();
1213 for (int i = 0; i != NElts; ++i) {
1221 SDValue SelectionDAG::getVectorShuffle(EVT VT, DebugLoc dl, SDValue N1,
1222 SDValue N2, const int *Mask) {
1223 assert(N1.getValueType() == N2.getValueType() && "Invalid VECTOR_SHUFFLE");
1224 assert(VT.isVector() && N1.getValueType().isVector() &&
1225 "Vector Shuffle VTs must be a vectors");
1226 assert(VT.getVectorElementType() == N1.getValueType().getVectorElementType()
1227 && "Vector Shuffle VTs must have same element type");
1229 // Canonicalize shuffle undef, undef -> undef
1230 if (N1.getOpcode() == ISD::UNDEF && N2.getOpcode() == ISD::UNDEF)
1231 return getUNDEF(VT);
1233 // Validate that all indices in Mask are within the range of the elements
1234 // input to the shuffle.
1235 unsigned NElts = VT.getVectorNumElements();
1236 SmallVector<int, 8> MaskVec;
1237 for (unsigned i = 0; i != NElts; ++i) {
1238 assert(Mask[i] < (int)(NElts * 2) && "Index out of range");
1239 MaskVec.push_back(Mask[i]);
1242 // Canonicalize shuffle v, v -> v, undef
1245 for (unsigned i = 0; i != NElts; ++i)
1246 if (MaskVec[i] >= (int)NElts) MaskVec[i] -= NElts;
1249 // Canonicalize shuffle undef, v -> v, undef. Commute the shuffle mask.
1250 if (N1.getOpcode() == ISD::UNDEF)
1251 commuteShuffle(N1, N2, MaskVec);
1253 // Canonicalize all index into lhs, -> shuffle lhs, undef
1254 // Canonicalize all index into rhs, -> shuffle rhs, undef
1255 bool AllLHS = true, AllRHS = true;
1256 bool N2Undef = N2.getOpcode() == ISD::UNDEF;
1257 for (unsigned i = 0; i != NElts; ++i) {
1258 if (MaskVec[i] >= (int)NElts) {
1263 } else if (MaskVec[i] >= 0) {
1267 if (AllLHS && AllRHS)
1268 return getUNDEF(VT);
1269 if (AllLHS && !N2Undef)
1273 commuteShuffle(N1, N2, MaskVec);
1276 // If Identity shuffle, or all shuffle in to undef, return that node.
1277 bool AllUndef = true;
1278 bool Identity = true;
1279 for (unsigned i = 0; i != NElts; ++i) {
1280 if (MaskVec[i] >= 0 && MaskVec[i] != (int)i) Identity = false;
1281 if (MaskVec[i] >= 0) AllUndef = false;
1283 if (Identity && NElts == N1.getValueType().getVectorNumElements())
1286 return getUNDEF(VT);
1288 FoldingSetNodeID ID;
1289 SDValue Ops[2] = { N1, N2 };
1290 AddNodeIDNode(ID, ISD::VECTOR_SHUFFLE, getVTList(VT), Ops, 2);
1291 for (unsigned i = 0; i != NElts; ++i)
1292 ID.AddInteger(MaskVec[i]);
1295 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1296 return SDValue(E, 0);
1298 // Allocate the mask array for the node out of the BumpPtrAllocator, since
1299 // SDNode doesn't have access to it. This memory will be "leaked" when
1300 // the node is deallocated, but recovered when the NodeAllocator is released.
1301 int *MaskAlloc = OperandAllocator.Allocate<int>(NElts);
1302 memcpy(MaskAlloc, &MaskVec[0], NElts * sizeof(int));
1304 ShuffleVectorSDNode *N =
1305 new (NodeAllocator) ShuffleVectorSDNode(VT, dl, N1, N2, MaskAlloc);
1306 CSEMap.InsertNode(N, IP);
1307 AllNodes.push_back(N);
1308 return SDValue(N, 0);
1311 SDValue SelectionDAG::getConvertRndSat(EVT VT, DebugLoc dl,
1312 SDValue Val, SDValue DTy,
1313 SDValue STy, SDValue Rnd, SDValue Sat,
1314 ISD::CvtCode Code) {
1315 // If the src and dest types are the same and the conversion is between
1316 // integer types of the same sign or two floats, no conversion is necessary.
1318 (Code == ISD::CVT_UU || Code == ISD::CVT_SS || Code == ISD::CVT_FF))
1321 FoldingSetNodeID ID;
1322 SDValue Ops[] = { Val, DTy, STy, Rnd, Sat };
1323 AddNodeIDNode(ID, ISD::CONVERT_RNDSAT, getVTList(VT), &Ops[0], 5);
1325 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1326 return SDValue(E, 0);
1328 CvtRndSatSDNode *N = new (NodeAllocator) CvtRndSatSDNode(VT, dl, Ops, 5,
1330 CSEMap.InsertNode(N, IP);
1331 AllNodes.push_back(N);
1332 return SDValue(N, 0);
1335 SDValue SelectionDAG::getRegister(unsigned RegNo, EVT VT) {
1336 FoldingSetNodeID ID;
1337 AddNodeIDNode(ID, ISD::Register, getVTList(VT), 0, 0);
1338 ID.AddInteger(RegNo);
1340 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1341 return SDValue(E, 0);
1343 SDNode *N = new (NodeAllocator) RegisterSDNode(RegNo, VT);
1344 CSEMap.InsertNode(N, IP);
1345 AllNodes.push_back(N);
1346 return SDValue(N, 0);
1349 SDValue SelectionDAG::getEHLabel(DebugLoc dl, SDValue Root, MCSymbol *Label) {
1350 FoldingSetNodeID ID;
1351 SDValue Ops[] = { Root };
1352 AddNodeIDNode(ID, ISD::EH_LABEL, getVTList(MVT::Other), &Ops[0], 1);
1353 ID.AddPointer(Label);
1355 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1356 return SDValue(E, 0);
1358 SDNode *N = new (NodeAllocator) EHLabelSDNode(dl, Root, Label);
1359 CSEMap.InsertNode(N, IP);
1360 AllNodes.push_back(N);
1361 return SDValue(N, 0);
1365 SDValue SelectionDAG::getBlockAddress(const BlockAddress *BA, EVT VT,
1367 unsigned char TargetFlags) {
1368 unsigned Opc = isTarget ? ISD::TargetBlockAddress : ISD::BlockAddress;
1370 FoldingSetNodeID ID;
1371 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0);
1373 ID.AddInteger(TargetFlags);
1375 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1376 return SDValue(E, 0);
1378 SDNode *N = new (NodeAllocator) BlockAddressSDNode(Opc, VT, BA, TargetFlags);
1379 CSEMap.InsertNode(N, IP);
1380 AllNodes.push_back(N);
1381 return SDValue(N, 0);
1384 SDValue SelectionDAG::getSrcValue(const Value *V) {
1385 assert((!V || V->getType()->isPointerTy()) &&
1386 "SrcValue is not a pointer?");
1388 FoldingSetNodeID ID;
1389 AddNodeIDNode(ID, ISD::SRCVALUE, getVTList(MVT::Other), 0, 0);
1393 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1394 return SDValue(E, 0);
1396 SDNode *N = new (NodeAllocator) SrcValueSDNode(V);
1397 CSEMap.InsertNode(N, IP);
1398 AllNodes.push_back(N);
1399 return SDValue(N, 0);
1402 /// getMDNode - Return an MDNodeSDNode which holds an MDNode.
1403 SDValue SelectionDAG::getMDNode(const MDNode *MD) {
1404 FoldingSetNodeID ID;
1405 AddNodeIDNode(ID, ISD::MDNODE_SDNODE, getVTList(MVT::Other), 0, 0);
1409 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1410 return SDValue(E, 0);
1412 SDNode *N = new (NodeAllocator) MDNodeSDNode(MD);
1413 CSEMap.InsertNode(N, IP);
1414 AllNodes.push_back(N);
1415 return SDValue(N, 0);
1419 /// getShiftAmountOperand - Return the specified value casted to
1420 /// the target's desired shift amount type.
1421 SDValue SelectionDAG::getShiftAmountOperand(EVT LHSTy, SDValue Op) {
1422 EVT OpTy = Op.getValueType();
1423 MVT ShTy = TLI.getShiftAmountTy(LHSTy);
1424 if (OpTy == ShTy || OpTy.isVector()) return Op;
1426 ISD::NodeType Opcode = OpTy.bitsGT(ShTy) ? ISD::TRUNCATE : ISD::ZERO_EXTEND;
1427 return getNode(Opcode, Op.getDebugLoc(), ShTy, Op);
1430 /// CreateStackTemporary - Create a stack temporary, suitable for holding the
1431 /// specified value type.
1432 SDValue SelectionDAG::CreateStackTemporary(EVT VT, unsigned minAlign) {
1433 MachineFrameInfo *FrameInfo = getMachineFunction().getFrameInfo();
1434 unsigned ByteSize = VT.getStoreSize();
1435 const Type *Ty = VT.getTypeForEVT(*getContext());
1436 unsigned StackAlign =
1437 std::max((unsigned)TLI.getTargetData()->getPrefTypeAlignment(Ty), minAlign);
1439 int FrameIdx = FrameInfo->CreateStackObject(ByteSize, StackAlign, false);
1440 return getFrameIndex(FrameIdx, TLI.getPointerTy());
1443 /// CreateStackTemporary - Create a stack temporary suitable for holding
1444 /// either of the specified value types.
1445 SDValue SelectionDAG::CreateStackTemporary(EVT VT1, EVT VT2) {
1446 unsigned Bytes = std::max(VT1.getStoreSizeInBits(),
1447 VT2.getStoreSizeInBits())/8;
1448 const Type *Ty1 = VT1.getTypeForEVT(*getContext());
1449 const Type *Ty2 = VT2.getTypeForEVT(*getContext());
1450 const TargetData *TD = TLI.getTargetData();
1451 unsigned Align = std::max(TD->getPrefTypeAlignment(Ty1),
1452 TD->getPrefTypeAlignment(Ty2));
1454 MachineFrameInfo *FrameInfo = getMachineFunction().getFrameInfo();
1455 int FrameIdx = FrameInfo->CreateStackObject(Bytes, Align, false);
1456 return getFrameIndex(FrameIdx, TLI.getPointerTy());
1459 SDValue SelectionDAG::FoldSetCC(EVT VT, SDValue N1,
1460 SDValue N2, ISD::CondCode Cond, DebugLoc dl) {
1461 // These setcc operations always fold.
1465 case ISD::SETFALSE2: return getConstant(0, VT);
1467 case ISD::SETTRUE2: return getConstant(1, VT);
1479 assert(!N1.getValueType().isInteger() && "Illegal setcc for integer!");
1483 if (ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.getNode())) {
1484 const APInt &C2 = N2C->getAPIntValue();
1485 if (ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.getNode())) {
1486 const APInt &C1 = N1C->getAPIntValue();
1489 default: llvm_unreachable("Unknown integer setcc!");
1490 case ISD::SETEQ: return getConstant(C1 == C2, VT);
1491 case ISD::SETNE: return getConstant(C1 != C2, VT);
1492 case ISD::SETULT: return getConstant(C1.ult(C2), VT);
1493 case ISD::SETUGT: return getConstant(C1.ugt(C2), VT);
1494 case ISD::SETULE: return getConstant(C1.ule(C2), VT);
1495 case ISD::SETUGE: return getConstant(C1.uge(C2), VT);
1496 case ISD::SETLT: return getConstant(C1.slt(C2), VT);
1497 case ISD::SETGT: return getConstant(C1.sgt(C2), VT);
1498 case ISD::SETLE: return getConstant(C1.sle(C2), VT);
1499 case ISD::SETGE: return getConstant(C1.sge(C2), VT);
1503 if (ConstantFPSDNode *N1C = dyn_cast<ConstantFPSDNode>(N1.getNode())) {
1504 if (ConstantFPSDNode *N2C = dyn_cast<ConstantFPSDNode>(N2.getNode())) {
1505 // No compile time operations on this type yet.
1506 if (N1C->getValueType(0) == MVT::ppcf128)
1509 APFloat::cmpResult R = N1C->getValueAPF().compare(N2C->getValueAPF());
1512 case ISD::SETEQ: if (R==APFloat::cmpUnordered)
1513 return getUNDEF(VT);
1515 case ISD::SETOEQ: return getConstant(R==APFloat::cmpEqual, VT);
1516 case ISD::SETNE: if (R==APFloat::cmpUnordered)
1517 return getUNDEF(VT);
1519 case ISD::SETONE: return getConstant(R==APFloat::cmpGreaterThan ||
1520 R==APFloat::cmpLessThan, VT);
1521 case ISD::SETLT: if (R==APFloat::cmpUnordered)
1522 return getUNDEF(VT);
1524 case ISD::SETOLT: return getConstant(R==APFloat::cmpLessThan, VT);
1525 case ISD::SETGT: if (R==APFloat::cmpUnordered)
1526 return getUNDEF(VT);
1528 case ISD::SETOGT: return getConstant(R==APFloat::cmpGreaterThan, VT);
1529 case ISD::SETLE: if (R==APFloat::cmpUnordered)
1530 return getUNDEF(VT);
1532 case ISD::SETOLE: return getConstant(R==APFloat::cmpLessThan ||
1533 R==APFloat::cmpEqual, VT);
1534 case ISD::SETGE: if (R==APFloat::cmpUnordered)
1535 return getUNDEF(VT);
1537 case ISD::SETOGE: return getConstant(R==APFloat::cmpGreaterThan ||
1538 R==APFloat::cmpEqual, VT);
1539 case ISD::SETO: return getConstant(R!=APFloat::cmpUnordered, VT);
1540 case ISD::SETUO: return getConstant(R==APFloat::cmpUnordered, VT);
1541 case ISD::SETUEQ: return getConstant(R==APFloat::cmpUnordered ||
1542 R==APFloat::cmpEqual, VT);
1543 case ISD::SETUNE: return getConstant(R!=APFloat::cmpEqual, VT);
1544 case ISD::SETULT: return getConstant(R==APFloat::cmpUnordered ||
1545 R==APFloat::cmpLessThan, VT);
1546 case ISD::SETUGT: return getConstant(R==APFloat::cmpGreaterThan ||
1547 R==APFloat::cmpUnordered, VT);
1548 case ISD::SETULE: return getConstant(R!=APFloat::cmpGreaterThan, VT);
1549 case ISD::SETUGE: return getConstant(R!=APFloat::cmpLessThan, VT);
1552 // Ensure that the constant occurs on the RHS.
1553 return getSetCC(dl, VT, N2, N1, ISD::getSetCCSwappedOperands(Cond));
1557 // Could not fold it.
1561 /// SignBitIsZero - Return true if the sign bit of Op is known to be zero. We
1562 /// use this predicate to simplify operations downstream.
1563 bool SelectionDAG::SignBitIsZero(SDValue Op, unsigned Depth) const {
1564 // This predicate is not safe for vector operations.
1565 if (Op.getValueType().isVector())
1568 unsigned BitWidth = Op.getValueType().getScalarType().getSizeInBits();
1569 return MaskedValueIsZero(Op, APInt::getSignBit(BitWidth), Depth);
1572 /// MaskedValueIsZero - Return true if 'V & Mask' is known to be zero. We use
1573 /// this predicate to simplify operations downstream. Mask is known to be zero
1574 /// for bits that V cannot have.
1575 bool SelectionDAG::MaskedValueIsZero(SDValue Op, const APInt &Mask,
1576 unsigned Depth) const {
1577 APInt KnownZero, KnownOne;
1578 ComputeMaskedBits(Op, Mask, KnownZero, KnownOne, Depth);
1579 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1580 return (KnownZero & Mask) == Mask;
1583 /// ComputeMaskedBits - Determine which of the bits specified in Mask are
1584 /// known to be either zero or one and return them in the KnownZero/KnownOne
1585 /// bitsets. This code only analyzes bits in Mask, in order to short-circuit
1587 void SelectionDAG::ComputeMaskedBits(SDValue Op, const APInt &Mask,
1588 APInt &KnownZero, APInt &KnownOne,
1589 unsigned Depth) const {
1590 unsigned BitWidth = Mask.getBitWidth();
1591 assert(BitWidth == Op.getValueType().getScalarType().getSizeInBits() &&
1592 "Mask size mismatches value type size!");
1594 KnownZero = KnownOne = APInt(BitWidth, 0); // Don't know anything.
1595 if (Depth == 6 || Mask == 0)
1596 return; // Limit search depth.
1598 APInt KnownZero2, KnownOne2;
1600 switch (Op.getOpcode()) {
1602 // We know all of the bits for a constant!
1603 KnownOne = cast<ConstantSDNode>(Op)->getAPIntValue() & Mask;
1604 KnownZero = ~KnownOne & Mask;
1607 // If either the LHS or the RHS are Zero, the result is zero.
1608 ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero, KnownOne, Depth+1);
1609 ComputeMaskedBits(Op.getOperand(0), Mask & ~KnownZero,
1610 KnownZero2, KnownOne2, Depth+1);
1611 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1612 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1614 // Output known-1 bits are only known if set in both the LHS & RHS.
1615 KnownOne &= KnownOne2;
1616 // Output known-0 are known to be clear if zero in either the LHS | RHS.
1617 KnownZero |= KnownZero2;
1620 ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero, KnownOne, Depth+1);
1621 ComputeMaskedBits(Op.getOperand(0), Mask & ~KnownOne,
1622 KnownZero2, KnownOne2, Depth+1);
1623 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1624 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1626 // Output known-0 bits are only known if clear in both the LHS & RHS.
1627 KnownZero &= KnownZero2;
1628 // Output known-1 are known to be set if set in either the LHS | RHS.
1629 KnownOne |= KnownOne2;
1632 ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero, KnownOne, Depth+1);
1633 ComputeMaskedBits(Op.getOperand(0), Mask, KnownZero2, KnownOne2, Depth+1);
1634 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1635 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1637 // Output known-0 bits are known if clear or set in both the LHS & RHS.
1638 APInt KnownZeroOut = (KnownZero & KnownZero2) | (KnownOne & KnownOne2);
1639 // Output known-1 are known to be set if set in only one of the LHS, RHS.
1640 KnownOne = (KnownZero & KnownOne2) | (KnownOne & KnownZero2);
1641 KnownZero = KnownZeroOut;
1645 APInt Mask2 = APInt::getAllOnesValue(BitWidth);
1646 ComputeMaskedBits(Op.getOperand(1), Mask2, KnownZero, KnownOne, Depth+1);
1647 ComputeMaskedBits(Op.getOperand(0), Mask2, KnownZero2, KnownOne2, Depth+1);
1648 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1649 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1651 // If low bits are zero in either operand, output low known-0 bits.
1652 // Also compute a conserative estimate for high known-0 bits.
1653 // More trickiness is possible, but this is sufficient for the
1654 // interesting case of alignment computation.
1655 KnownOne.clearAllBits();
1656 unsigned TrailZ = KnownZero.countTrailingOnes() +
1657 KnownZero2.countTrailingOnes();
1658 unsigned LeadZ = std::max(KnownZero.countLeadingOnes() +
1659 KnownZero2.countLeadingOnes(),
1660 BitWidth) - BitWidth;
1662 TrailZ = std::min(TrailZ, BitWidth);
1663 LeadZ = std::min(LeadZ, BitWidth);
1664 KnownZero = APInt::getLowBitsSet(BitWidth, TrailZ) |
1665 APInt::getHighBitsSet(BitWidth, LeadZ);
1670 // For the purposes of computing leading zeros we can conservatively
1671 // treat a udiv as a logical right shift by the power of 2 known to
1672 // be less than the denominator.
1673 APInt AllOnes = APInt::getAllOnesValue(BitWidth);
1674 ComputeMaskedBits(Op.getOperand(0),
1675 AllOnes, KnownZero2, KnownOne2, Depth+1);
1676 unsigned LeadZ = KnownZero2.countLeadingOnes();
1678 KnownOne2.clearAllBits();
1679 KnownZero2.clearAllBits();
1680 ComputeMaskedBits(Op.getOperand(1),
1681 AllOnes, KnownZero2, KnownOne2, Depth+1);
1682 unsigned RHSUnknownLeadingOnes = KnownOne2.countLeadingZeros();
1683 if (RHSUnknownLeadingOnes != BitWidth)
1684 LeadZ = std::min(BitWidth,
1685 LeadZ + BitWidth - RHSUnknownLeadingOnes - 1);
1687 KnownZero = APInt::getHighBitsSet(BitWidth, LeadZ) & Mask;
1691 ComputeMaskedBits(Op.getOperand(2), Mask, KnownZero, KnownOne, Depth+1);
1692 ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero2, KnownOne2, Depth+1);
1693 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1694 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1696 // Only known if known in both the LHS and RHS.
1697 KnownOne &= KnownOne2;
1698 KnownZero &= KnownZero2;
1700 case ISD::SELECT_CC:
1701 ComputeMaskedBits(Op.getOperand(3), Mask, KnownZero, KnownOne, Depth+1);
1702 ComputeMaskedBits(Op.getOperand(2), Mask, KnownZero2, KnownOne2, Depth+1);
1703 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1704 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1706 // Only known if known in both the LHS and RHS.
1707 KnownOne &= KnownOne2;
1708 KnownZero &= KnownZero2;
1716 if (Op.getResNo() != 1)
1718 // The boolean result conforms to getBooleanContents. Fall through.
1720 // If we know the result of a setcc has the top bits zero, use this info.
1721 if (TLI.getBooleanContents() == TargetLowering::ZeroOrOneBooleanContent &&
1723 KnownZero |= APInt::getHighBitsSet(BitWidth, BitWidth - 1);
1726 // (shl X, C1) & C2 == 0 iff (X & C2 >>u C1) == 0
1727 if (ConstantSDNode *SA = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
1728 unsigned ShAmt = SA->getZExtValue();
1730 // If the shift count is an invalid immediate, don't do anything.
1731 if (ShAmt >= BitWidth)
1734 ComputeMaskedBits(Op.getOperand(0), Mask.lshr(ShAmt),
1735 KnownZero, KnownOne, Depth+1);
1736 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1737 KnownZero <<= ShAmt;
1739 // low bits known zero.
1740 KnownZero |= APInt::getLowBitsSet(BitWidth, ShAmt);
1744 // (ushr X, C1) & C2 == 0 iff (-1 >> C1) & C2 == 0
1745 if (ConstantSDNode *SA = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
1746 unsigned ShAmt = SA->getZExtValue();
1748 // If the shift count is an invalid immediate, don't do anything.
1749 if (ShAmt >= BitWidth)
1752 ComputeMaskedBits(Op.getOperand(0), (Mask << ShAmt),
1753 KnownZero, KnownOne, Depth+1);
1754 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1755 KnownZero = KnownZero.lshr(ShAmt);
1756 KnownOne = KnownOne.lshr(ShAmt);
1758 APInt HighBits = APInt::getHighBitsSet(BitWidth, ShAmt) & Mask;
1759 KnownZero |= HighBits; // High bits known zero.
1763 if (ConstantSDNode *SA = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
1764 unsigned ShAmt = SA->getZExtValue();
1766 // If the shift count is an invalid immediate, don't do anything.
1767 if (ShAmt >= BitWidth)
1770 APInt InDemandedMask = (Mask << ShAmt);
1771 // If any of the demanded bits are produced by the sign extension, we also
1772 // demand the input sign bit.
1773 APInt HighBits = APInt::getHighBitsSet(BitWidth, ShAmt) & Mask;
1774 if (HighBits.getBoolValue())
1775 InDemandedMask |= APInt::getSignBit(BitWidth);
1777 ComputeMaskedBits(Op.getOperand(0), InDemandedMask, KnownZero, KnownOne,
1779 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1780 KnownZero = KnownZero.lshr(ShAmt);
1781 KnownOne = KnownOne.lshr(ShAmt);
1783 // Handle the sign bits.
1784 APInt SignBit = APInt::getSignBit(BitWidth);
1785 SignBit = SignBit.lshr(ShAmt); // Adjust to where it is now in the mask.
1787 if (KnownZero.intersects(SignBit)) {
1788 KnownZero |= HighBits; // New bits are known zero.
1789 } else if (KnownOne.intersects(SignBit)) {
1790 KnownOne |= HighBits; // New bits are known one.
1794 case ISD::SIGN_EXTEND_INREG: {
1795 EVT EVT = cast<VTSDNode>(Op.getOperand(1))->getVT();
1796 unsigned EBits = EVT.getScalarType().getSizeInBits();
1798 // Sign extension. Compute the demanded bits in the result that are not
1799 // present in the input.
1800 APInt NewBits = APInt::getHighBitsSet(BitWidth, BitWidth - EBits) & Mask;
1802 APInt InSignBit = APInt::getSignBit(EBits);
1803 APInt InputDemandedBits = Mask & APInt::getLowBitsSet(BitWidth, EBits);
1805 // If the sign extended bits are demanded, we know that the sign
1807 InSignBit = InSignBit.zext(BitWidth);
1808 if (NewBits.getBoolValue())
1809 InputDemandedBits |= InSignBit;
1811 ComputeMaskedBits(Op.getOperand(0), InputDemandedBits,
1812 KnownZero, KnownOne, Depth+1);
1813 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1815 // If the sign bit of the input is known set or clear, then we know the
1816 // top bits of the result.
1817 if (KnownZero.intersects(InSignBit)) { // Input sign bit known clear
1818 KnownZero |= NewBits;
1819 KnownOne &= ~NewBits;
1820 } else if (KnownOne.intersects(InSignBit)) { // Input sign bit known set
1821 KnownOne |= NewBits;
1822 KnownZero &= ~NewBits;
1823 } else { // Input sign bit unknown
1824 KnownZero &= ~NewBits;
1825 KnownOne &= ~NewBits;
1832 unsigned LowBits = Log2_32(BitWidth)+1;
1833 KnownZero = APInt::getHighBitsSet(BitWidth, BitWidth - LowBits);
1834 KnownOne.clearAllBits();
1838 if (ISD::isZEXTLoad(Op.getNode())) {
1839 LoadSDNode *LD = cast<LoadSDNode>(Op);
1840 EVT VT = LD->getMemoryVT();
1841 unsigned MemBits = VT.getScalarType().getSizeInBits();
1842 KnownZero |= APInt::getHighBitsSet(BitWidth, BitWidth - MemBits) & Mask;
1846 case ISD::ZERO_EXTEND: {
1847 EVT InVT = Op.getOperand(0).getValueType();
1848 unsigned InBits = InVT.getScalarType().getSizeInBits();
1849 APInt NewBits = APInt::getHighBitsSet(BitWidth, BitWidth - InBits) & Mask;
1850 APInt InMask = Mask.trunc(InBits);
1851 KnownZero = KnownZero.trunc(InBits);
1852 KnownOne = KnownOne.trunc(InBits);
1853 ComputeMaskedBits(Op.getOperand(0), InMask, KnownZero, KnownOne, Depth+1);
1854 KnownZero = KnownZero.zext(BitWidth);
1855 KnownOne = KnownOne.zext(BitWidth);
1856 KnownZero |= NewBits;
1859 case ISD::SIGN_EXTEND: {
1860 EVT InVT = Op.getOperand(0).getValueType();
1861 unsigned InBits = InVT.getScalarType().getSizeInBits();
1862 APInt InSignBit = APInt::getSignBit(InBits);
1863 APInt NewBits = APInt::getHighBitsSet(BitWidth, BitWidth - InBits) & Mask;
1864 APInt InMask = Mask.trunc(InBits);
1866 // If any of the sign extended bits are demanded, we know that the sign
1867 // bit is demanded. Temporarily set this bit in the mask for our callee.
1868 if (NewBits.getBoolValue())
1869 InMask |= InSignBit;
1871 KnownZero = KnownZero.trunc(InBits);
1872 KnownOne = KnownOne.trunc(InBits);
1873 ComputeMaskedBits(Op.getOperand(0), InMask, KnownZero, KnownOne, Depth+1);
1875 // Note if the sign bit is known to be zero or one.
1876 bool SignBitKnownZero = KnownZero.isNegative();
1877 bool SignBitKnownOne = KnownOne.isNegative();
1878 assert(!(SignBitKnownZero && SignBitKnownOne) &&
1879 "Sign bit can't be known to be both zero and one!");
1881 // If the sign bit wasn't actually demanded by our caller, we don't
1882 // want it set in the KnownZero and KnownOne result values. Reset the
1883 // mask and reapply it to the result values.
1884 InMask = Mask.trunc(InBits);
1885 KnownZero &= InMask;
1888 KnownZero = KnownZero.zext(BitWidth);
1889 KnownOne = KnownOne.zext(BitWidth);
1891 // If the sign bit is known zero or one, the top bits match.
1892 if (SignBitKnownZero)
1893 KnownZero |= NewBits;
1894 else if (SignBitKnownOne)
1895 KnownOne |= NewBits;
1898 case ISD::ANY_EXTEND: {
1899 EVT InVT = Op.getOperand(0).getValueType();
1900 unsigned InBits = InVT.getScalarType().getSizeInBits();
1901 APInt InMask = Mask.trunc(InBits);
1902 KnownZero = KnownZero.trunc(InBits);
1903 KnownOne = KnownOne.trunc(InBits);
1904 ComputeMaskedBits(Op.getOperand(0), InMask, KnownZero, KnownOne, Depth+1);
1905 KnownZero = KnownZero.zext(BitWidth);
1906 KnownOne = KnownOne.zext(BitWidth);
1909 case ISD::TRUNCATE: {
1910 EVT InVT = Op.getOperand(0).getValueType();
1911 unsigned InBits = InVT.getScalarType().getSizeInBits();
1912 APInt InMask = Mask.zext(InBits);
1913 KnownZero = KnownZero.zext(InBits);
1914 KnownOne = KnownOne.zext(InBits);
1915 ComputeMaskedBits(Op.getOperand(0), InMask, KnownZero, KnownOne, Depth+1);
1916 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1917 KnownZero = KnownZero.trunc(BitWidth);
1918 KnownOne = KnownOne.trunc(BitWidth);
1921 case ISD::AssertZext: {
1922 EVT VT = cast<VTSDNode>(Op.getOperand(1))->getVT();
1923 APInt InMask = APInt::getLowBitsSet(BitWidth, VT.getSizeInBits());
1924 ComputeMaskedBits(Op.getOperand(0), Mask & InMask, KnownZero,
1926 KnownZero |= (~InMask) & Mask;
1930 // All bits are zero except the low bit.
1931 KnownZero = APInt::getHighBitsSet(BitWidth, BitWidth - 1);
1935 if (ConstantSDNode *CLHS = dyn_cast<ConstantSDNode>(Op.getOperand(0))) {
1936 // We know that the top bits of C-X are clear if X contains less bits
1937 // than C (i.e. no wrap-around can happen). For example, 20-X is
1938 // positive if we can prove that X is >= 0 and < 16.
1939 if (CLHS->getAPIntValue().isNonNegative()) {
1940 unsigned NLZ = (CLHS->getAPIntValue()+1).countLeadingZeros();
1941 // NLZ can't be BitWidth with no sign bit
1942 APInt MaskV = APInt::getHighBitsSet(BitWidth, NLZ+1);
1943 ComputeMaskedBits(Op.getOperand(1), MaskV, KnownZero2, KnownOne2,
1946 // If all of the MaskV bits are known to be zero, then we know the
1947 // output top bits are zero, because we now know that the output is
1949 if ((KnownZero2 & MaskV) == MaskV) {
1950 unsigned NLZ2 = CLHS->getAPIntValue().countLeadingZeros();
1951 // Top bits known zero.
1952 KnownZero = APInt::getHighBitsSet(BitWidth, NLZ2) & Mask;
1960 // Output known-0 bits are known if clear or set in both the low clear bits
1961 // common to both LHS & RHS. For example, 8+(X<<3) is known to have the
1962 // low 3 bits clear.
1963 APInt Mask2 = APInt::getLowBitsSet(BitWidth,
1964 BitWidth - Mask.countLeadingZeros());
1965 ComputeMaskedBits(Op.getOperand(0), Mask2, KnownZero2, KnownOne2, Depth+1);
1966 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1967 unsigned KnownZeroOut = KnownZero2.countTrailingOnes();
1969 ComputeMaskedBits(Op.getOperand(1), Mask2, KnownZero2, KnownOne2, Depth+1);
1970 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1971 KnownZeroOut = std::min(KnownZeroOut,
1972 KnownZero2.countTrailingOnes());
1974 if (Op.getOpcode() == ISD::ADD) {
1975 KnownZero |= APInt::getLowBitsSet(BitWidth, KnownZeroOut);
1979 // With ADDE, a carry bit may be added in, so we can only use this
1980 // information if we know (at least) that the low two bits are clear. We
1981 // then return to the caller that the low bit is unknown but that other bits
1983 if (KnownZeroOut >= 2) // ADDE
1984 KnownZero |= APInt::getBitsSet(BitWidth, 1, KnownZeroOut);
1988 if (ConstantSDNode *Rem = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
1989 const APInt &RA = Rem->getAPIntValue().abs();
1990 if (RA.isPowerOf2()) {
1991 APInt LowBits = RA - 1;
1992 APInt Mask2 = LowBits | APInt::getSignBit(BitWidth);
1993 ComputeMaskedBits(Op.getOperand(0), Mask2,KnownZero2,KnownOne2,Depth+1);
1995 // The low bits of the first operand are unchanged by the srem.
1996 KnownZero = KnownZero2 & LowBits;
1997 KnownOne = KnownOne2 & LowBits;
1999 // If the first operand is non-negative or has all low bits zero, then
2000 // the upper bits are all zero.
2001 if (KnownZero2[BitWidth-1] || ((KnownZero2 & LowBits) == LowBits))
2002 KnownZero |= ~LowBits;
2004 // If the first operand is negative and not all low bits are zero, then
2005 // the upper bits are all one.
2006 if (KnownOne2[BitWidth-1] && ((KnownOne2 & LowBits) != 0))
2007 KnownOne |= ~LowBits;
2012 assert((KnownZero & KnownOne) == 0&&"Bits known to be one AND zero?");
2017 if (ConstantSDNode *Rem = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
2018 const APInt &RA = Rem->getAPIntValue();
2019 if (RA.isPowerOf2()) {
2020 APInt LowBits = (RA - 1);
2021 APInt Mask2 = LowBits & Mask;
2022 KnownZero |= ~LowBits & Mask;
2023 ComputeMaskedBits(Op.getOperand(0), Mask2, KnownZero, KnownOne,Depth+1);
2024 assert((KnownZero & KnownOne) == 0&&"Bits known to be one AND zero?");
2029 // Since the result is less than or equal to either operand, any leading
2030 // zero bits in either operand must also exist in the result.
2031 APInt AllOnes = APInt::getAllOnesValue(BitWidth);
2032 ComputeMaskedBits(Op.getOperand(0), AllOnes, KnownZero, KnownOne,
2034 ComputeMaskedBits(Op.getOperand(1), AllOnes, KnownZero2, KnownOne2,
2037 uint32_t Leaders = std::max(KnownZero.countLeadingOnes(),
2038 KnownZero2.countLeadingOnes());
2039 KnownOne.clearAllBits();
2040 KnownZero = APInt::getHighBitsSet(BitWidth, Leaders) & Mask;
2043 case ISD::FrameIndex:
2044 case ISD::TargetFrameIndex:
2045 if (unsigned Align = InferPtrAlignment(Op)) {
2046 // The low bits are known zero if the pointer is aligned.
2047 KnownZero = APInt::getLowBitsSet(BitWidth, Log2_32(Align));
2053 // Allow the target to implement this method for its nodes.
2054 if (Op.getOpcode() >= ISD::BUILTIN_OP_END) {
2055 case ISD::INTRINSIC_WO_CHAIN:
2056 case ISD::INTRINSIC_W_CHAIN:
2057 case ISD::INTRINSIC_VOID:
2058 TLI.computeMaskedBitsForTargetNode(Op, Mask, KnownZero, KnownOne, *this,
2065 /// ComputeNumSignBits - Return the number of times the sign bit of the
2066 /// register is replicated into the other bits. We know that at least 1 bit
2067 /// is always equal to the sign bit (itself), but other cases can give us
2068 /// information. For example, immediately after an "SRA X, 2", we know that
2069 /// the top 3 bits are all equal to each other, so we return 3.
2070 unsigned SelectionDAG::ComputeNumSignBits(SDValue Op, unsigned Depth) const{
2071 EVT VT = Op.getValueType();
2072 assert(VT.isInteger() && "Invalid VT!");
2073 unsigned VTBits = VT.getScalarType().getSizeInBits();
2075 unsigned FirstAnswer = 1;
2078 return 1; // Limit search depth.
2080 switch (Op.getOpcode()) {
2082 case ISD::AssertSext:
2083 Tmp = cast<VTSDNode>(Op.getOperand(1))->getVT().getSizeInBits();
2084 return VTBits-Tmp+1;
2085 case ISD::AssertZext:
2086 Tmp = cast<VTSDNode>(Op.getOperand(1))->getVT().getSizeInBits();
2089 case ISD::Constant: {
2090 const APInt &Val = cast<ConstantSDNode>(Op)->getAPIntValue();
2091 return Val.getNumSignBits();
2094 case ISD::SIGN_EXTEND:
2095 Tmp = VTBits-Op.getOperand(0).getValueType().getScalarType().getSizeInBits();
2096 return ComputeNumSignBits(Op.getOperand(0), Depth+1) + Tmp;
2098 case ISD::SIGN_EXTEND_INREG:
2099 // Max of the input and what this extends.
2101 cast<VTSDNode>(Op.getOperand(1))->getVT().getScalarType().getSizeInBits();
2104 Tmp2 = ComputeNumSignBits(Op.getOperand(0), Depth+1);
2105 return std::max(Tmp, Tmp2);
2108 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
2109 // SRA X, C -> adds C sign bits.
2110 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
2111 Tmp += C->getZExtValue();
2112 if (Tmp > VTBits) Tmp = VTBits;
2116 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
2117 // shl destroys sign bits.
2118 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
2119 if (C->getZExtValue() >= VTBits || // Bad shift.
2120 C->getZExtValue() >= Tmp) break; // Shifted all sign bits out.
2121 return Tmp - C->getZExtValue();
2126 case ISD::XOR: // NOT is handled here.
2127 // Logical binary ops preserve the number of sign bits at the worst.
2128 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
2130 Tmp2 = ComputeNumSignBits(Op.getOperand(1), Depth+1);
2131 FirstAnswer = std::min(Tmp, Tmp2);
2132 // We computed what we know about the sign bits as our first
2133 // answer. Now proceed to the generic code that uses
2134 // ComputeMaskedBits, and pick whichever answer is better.
2139 Tmp = ComputeNumSignBits(Op.getOperand(1), Depth+1);
2140 if (Tmp == 1) return 1; // Early out.
2141 Tmp2 = ComputeNumSignBits(Op.getOperand(2), Depth+1);
2142 return std::min(Tmp, Tmp2);
2150 if (Op.getResNo() != 1)
2152 // The boolean result conforms to getBooleanContents. Fall through.
2154 // If setcc returns 0/-1, all bits are sign bits.
2155 if (TLI.getBooleanContents() ==
2156 TargetLowering::ZeroOrNegativeOneBooleanContent)
2161 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
2162 unsigned RotAmt = C->getZExtValue() & (VTBits-1);
2164 // Handle rotate right by N like a rotate left by 32-N.
2165 if (Op.getOpcode() == ISD::ROTR)
2166 RotAmt = (VTBits-RotAmt) & (VTBits-1);
2168 // If we aren't rotating out all of the known-in sign bits, return the
2169 // number that are left. This handles rotl(sext(x), 1) for example.
2170 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
2171 if (Tmp > RotAmt+1) return Tmp-RotAmt;
2175 // Add can have at most one carry bit. Thus we know that the output
2176 // is, at worst, one more bit than the inputs.
2177 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
2178 if (Tmp == 1) return 1; // Early out.
2180 // Special case decrementing a value (ADD X, -1):
2181 if (ConstantSDNode *CRHS = dyn_cast<ConstantSDNode>(Op.getOperand(1)))
2182 if (CRHS->isAllOnesValue()) {
2183 APInt KnownZero, KnownOne;
2184 APInt Mask = APInt::getAllOnesValue(VTBits);
2185 ComputeMaskedBits(Op.getOperand(0), Mask, KnownZero, KnownOne, Depth+1);
2187 // If the input is known to be 0 or 1, the output is 0/-1, which is all
2189 if ((KnownZero | APInt(VTBits, 1)) == Mask)
2192 // If we are subtracting one from a positive number, there is no carry
2193 // out of the result.
2194 if (KnownZero.isNegative())
2198 Tmp2 = ComputeNumSignBits(Op.getOperand(1), Depth+1);
2199 if (Tmp2 == 1) return 1;
2200 return std::min(Tmp, Tmp2)-1;
2204 Tmp2 = ComputeNumSignBits(Op.getOperand(1), Depth+1);
2205 if (Tmp2 == 1) return 1;
2208 if (ConstantSDNode *CLHS = dyn_cast<ConstantSDNode>(Op.getOperand(0)))
2209 if (CLHS->isNullValue()) {
2210 APInt KnownZero, KnownOne;
2211 APInt Mask = APInt::getAllOnesValue(VTBits);
2212 ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero, KnownOne, Depth+1);
2213 // If the input is known to be 0 or 1, the output is 0/-1, which is all
2215 if ((KnownZero | APInt(VTBits, 1)) == Mask)
2218 // If the input is known to be positive (the sign bit is known clear),
2219 // the output of the NEG has the same number of sign bits as the input.
2220 if (KnownZero.isNegative())
2223 // Otherwise, we treat this like a SUB.
2226 // Sub can have at most one carry bit. Thus we know that the output
2227 // is, at worst, one more bit than the inputs.
2228 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
2229 if (Tmp == 1) return 1; // Early out.
2230 return std::min(Tmp, Tmp2)-1;
2233 // FIXME: it's tricky to do anything useful for this, but it is an important
2234 // case for targets like X86.
2238 // Handle LOADX separately here. EXTLOAD case will fallthrough.
2239 if (Op.getOpcode() == ISD::LOAD) {
2240 LoadSDNode *LD = cast<LoadSDNode>(Op);
2241 unsigned ExtType = LD->getExtensionType();
2244 case ISD::SEXTLOAD: // '17' bits known
2245 Tmp = LD->getMemoryVT().getScalarType().getSizeInBits();
2246 return VTBits-Tmp+1;
2247 case ISD::ZEXTLOAD: // '16' bits known
2248 Tmp = LD->getMemoryVT().getScalarType().getSizeInBits();
2253 // Allow the target to implement this method for its nodes.
2254 if (Op.getOpcode() >= ISD::BUILTIN_OP_END ||
2255 Op.getOpcode() == ISD::INTRINSIC_WO_CHAIN ||
2256 Op.getOpcode() == ISD::INTRINSIC_W_CHAIN ||
2257 Op.getOpcode() == ISD::INTRINSIC_VOID) {
2258 unsigned NumBits = TLI.ComputeNumSignBitsForTargetNode(Op, Depth);
2259 if (NumBits > 1) FirstAnswer = std::max(FirstAnswer, NumBits);
2262 // Finally, if we can prove that the top bits of the result are 0's or 1's,
2263 // use this information.
2264 APInt KnownZero, KnownOne;
2265 APInt Mask = APInt::getAllOnesValue(VTBits);
2266 ComputeMaskedBits(Op, Mask, KnownZero, KnownOne, Depth);
2268 if (KnownZero.isNegative()) { // sign bit is 0
2270 } else if (KnownOne.isNegative()) { // sign bit is 1;
2277 // Okay, we know that the sign bit in Mask is set. Use CLZ to determine
2278 // the number of identical bits in the top of the input value.
2280 Mask <<= Mask.getBitWidth()-VTBits;
2281 // Return # leading zeros. We use 'min' here in case Val was zero before
2282 // shifting. We don't want to return '64' as for an i32 "0".
2283 return std::max(FirstAnswer, std::min(VTBits, Mask.countLeadingZeros()));
2286 /// isBaseWithConstantOffset - Return true if the specified operand is an
2287 /// ISD::ADD with a ConstantSDNode on the right-hand side, or if it is an
2288 /// ISD::OR with a ConstantSDNode that is guaranteed to have the same
2289 /// semantics as an ADD. This handles the equivalence:
2290 /// X|Cst == X+Cst iff X&Cst = 0.
2291 bool SelectionDAG::isBaseWithConstantOffset(SDValue Op) const {
2292 if ((Op.getOpcode() != ISD::ADD && Op.getOpcode() != ISD::OR) ||
2293 !isa<ConstantSDNode>(Op.getOperand(1)))
2296 if (Op.getOpcode() == ISD::OR &&
2297 !MaskedValueIsZero(Op.getOperand(0),
2298 cast<ConstantSDNode>(Op.getOperand(1))->getAPIntValue()))
2305 bool SelectionDAG::isKnownNeverNaN(SDValue Op) const {
2306 // If we're told that NaNs won't happen, assume they won't.
2310 // If the value is a constant, we can obviously see if it is a NaN or not.
2311 if (const ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(Op))
2312 return !C->getValueAPF().isNaN();
2314 // TODO: Recognize more cases here.
2319 bool SelectionDAG::isKnownNeverZero(SDValue Op) const {
2320 // If the value is a constant, we can obviously see if it is a zero or not.
2321 if (const ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(Op))
2322 return !C->isZero();
2324 // TODO: Recognize more cases here.
2329 bool SelectionDAG::isEqualTo(SDValue A, SDValue B) const {
2330 // Check the obvious case.
2331 if (A == B) return true;
2333 // For for negative and positive zero.
2334 if (const ConstantFPSDNode *CA = dyn_cast<ConstantFPSDNode>(A))
2335 if (const ConstantFPSDNode *CB = dyn_cast<ConstantFPSDNode>(B))
2336 if (CA->isZero() && CB->isZero()) return true;
2338 // Otherwise they may not be equal.
2342 bool SelectionDAG::isVerifiedDebugInfoDesc(SDValue Op) const {
2343 GlobalAddressSDNode *GA = dyn_cast<GlobalAddressSDNode>(Op);
2344 if (!GA) return false;
2345 if (GA->getOffset() != 0) return false;
2346 const GlobalVariable *GV = dyn_cast<GlobalVariable>(GA->getGlobal());
2347 if (!GV) return false;
2348 return MF->getMMI().hasDebugInfo();
2352 /// getNode - Gets or creates the specified node.
2354 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT) {
2355 FoldingSetNodeID ID;
2356 AddNodeIDNode(ID, Opcode, getVTList(VT), 0, 0);
2358 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
2359 return SDValue(E, 0);
2361 SDNode *N = new (NodeAllocator) SDNode(Opcode, DL, getVTList(VT));
2362 CSEMap.InsertNode(N, IP);
2364 AllNodes.push_back(N);
2368 return SDValue(N, 0);
2371 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL,
2372 EVT VT, SDValue Operand) {
2373 // Constant fold unary operations with an integer constant operand.
2374 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Operand.getNode())) {
2375 const APInt &Val = C->getAPIntValue();
2378 case ISD::SIGN_EXTEND:
2379 return getConstant(Val.sextOrTrunc(VT.getSizeInBits()), VT);
2380 case ISD::ANY_EXTEND:
2381 case ISD::ZERO_EXTEND:
2383 return getConstant(Val.zextOrTrunc(VT.getSizeInBits()), VT);
2384 case ISD::UINT_TO_FP:
2385 case ISD::SINT_TO_FP: {
2386 // No compile time operations on ppcf128.
2387 if (VT == MVT::ppcf128) break;
2388 APFloat apf(APInt::getNullValue(VT.getSizeInBits()));
2389 (void)apf.convertFromAPInt(Val,
2390 Opcode==ISD::SINT_TO_FP,
2391 APFloat::rmNearestTiesToEven);
2392 return getConstantFP(apf, VT);
2395 if (VT == MVT::f32 && C->getValueType(0) == MVT::i32)
2396 return getConstantFP(Val.bitsToFloat(), VT);
2397 else if (VT == MVT::f64 && C->getValueType(0) == MVT::i64)
2398 return getConstantFP(Val.bitsToDouble(), VT);
2401 return getConstant(Val.byteSwap(), VT);
2403 return getConstant(Val.countPopulation(), VT);
2405 return getConstant(Val.countLeadingZeros(), VT);
2407 return getConstant(Val.countTrailingZeros(), VT);
2411 // Constant fold unary operations with a floating point constant operand.
2412 if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(Operand.getNode())) {
2413 APFloat V = C->getValueAPF(); // make copy
2414 if (VT != MVT::ppcf128 && Operand.getValueType() != MVT::ppcf128) {
2418 return getConstantFP(V, VT);
2421 return getConstantFP(V, VT);
2423 case ISD::FP_EXTEND: {
2425 // This can return overflow, underflow, or inexact; we don't care.
2426 // FIXME need to be more flexible about rounding mode.
2427 (void)V.convert(*EVTToAPFloatSemantics(VT),
2428 APFloat::rmNearestTiesToEven, &ignored);
2429 return getConstantFP(V, VT);
2431 case ISD::FP_TO_SINT:
2432 case ISD::FP_TO_UINT: {
2435 assert(integerPartWidth >= 64);
2436 // FIXME need to be more flexible about rounding mode.
2437 APFloat::opStatus s = V.convertToInteger(x, VT.getSizeInBits(),
2438 Opcode==ISD::FP_TO_SINT,
2439 APFloat::rmTowardZero, &ignored);
2440 if (s==APFloat::opInvalidOp) // inexact is OK, in fact usual
2442 APInt api(VT.getSizeInBits(), 2, x);
2443 return getConstant(api, VT);
2446 if (VT == MVT::i32 && C->getValueType(0) == MVT::f32)
2447 return getConstant((uint32_t)V.bitcastToAPInt().getZExtValue(), VT);
2448 else if (VT == MVT::i64 && C->getValueType(0) == MVT::f64)
2449 return getConstant(V.bitcastToAPInt().getZExtValue(), VT);
2455 unsigned OpOpcode = Operand.getNode()->getOpcode();
2457 case ISD::TokenFactor:
2458 case ISD::MERGE_VALUES:
2459 case ISD::CONCAT_VECTORS:
2460 return Operand; // Factor, merge or concat of one node? No need.
2461 case ISD::FP_ROUND: llvm_unreachable("Invalid method to make FP_ROUND node");
2462 case ISD::FP_EXTEND:
2463 assert(VT.isFloatingPoint() &&
2464 Operand.getValueType().isFloatingPoint() && "Invalid FP cast!");
2465 if (Operand.getValueType() == VT) return Operand; // noop conversion.
2466 assert((!VT.isVector() ||
2467 VT.getVectorNumElements() ==
2468 Operand.getValueType().getVectorNumElements()) &&
2469 "Vector element count mismatch!");
2470 if (Operand.getOpcode() == ISD::UNDEF)
2471 return getUNDEF(VT);
2473 case ISD::SIGN_EXTEND:
2474 assert(VT.isInteger() && Operand.getValueType().isInteger() &&
2475 "Invalid SIGN_EXTEND!");
2476 if (Operand.getValueType() == VT) return Operand; // noop extension
2477 assert(Operand.getValueType().getScalarType().bitsLT(VT.getScalarType()) &&
2478 "Invalid sext node, dst < src!");
2479 assert((!VT.isVector() ||
2480 VT.getVectorNumElements() ==
2481 Operand.getValueType().getVectorNumElements()) &&
2482 "Vector element count mismatch!");
2483 if (OpOpcode == ISD::SIGN_EXTEND || OpOpcode == ISD::ZERO_EXTEND)
2484 return getNode(OpOpcode, DL, VT, Operand.getNode()->getOperand(0));
2485 else if (OpOpcode == ISD::UNDEF)
2486 // sext(undef) = 0, because the top bits will all be the same.
2487 return getConstant(0, VT);
2489 case ISD::ZERO_EXTEND:
2490 assert(VT.isInteger() && Operand.getValueType().isInteger() &&
2491 "Invalid ZERO_EXTEND!");
2492 if (Operand.getValueType() == VT) return Operand; // noop extension
2493 assert(Operand.getValueType().getScalarType().bitsLT(VT.getScalarType()) &&
2494 "Invalid zext node, dst < src!");
2495 assert((!VT.isVector() ||
2496 VT.getVectorNumElements() ==
2497 Operand.getValueType().getVectorNumElements()) &&
2498 "Vector element count mismatch!");
2499 if (OpOpcode == ISD::ZERO_EXTEND) // (zext (zext x)) -> (zext x)
2500 return getNode(ISD::ZERO_EXTEND, DL, VT,
2501 Operand.getNode()->getOperand(0));
2502 else if (OpOpcode == ISD::UNDEF)
2503 // zext(undef) = 0, because the top bits will be zero.
2504 return getConstant(0, VT);
2506 case ISD::ANY_EXTEND:
2507 assert(VT.isInteger() && Operand.getValueType().isInteger() &&
2508 "Invalid ANY_EXTEND!");
2509 if (Operand.getValueType() == VT) return Operand; // noop extension
2510 assert(Operand.getValueType().getScalarType().bitsLT(VT.getScalarType()) &&
2511 "Invalid anyext node, dst < src!");
2512 assert((!VT.isVector() ||
2513 VT.getVectorNumElements() ==
2514 Operand.getValueType().getVectorNumElements()) &&
2515 "Vector element count mismatch!");
2517 if (OpOpcode == ISD::ZERO_EXTEND || OpOpcode == ISD::SIGN_EXTEND ||
2518 OpOpcode == ISD::ANY_EXTEND)
2519 // (ext (zext x)) -> (zext x) and (ext (sext x)) -> (sext x)
2520 return getNode(OpOpcode, DL, VT, Operand.getNode()->getOperand(0));
2521 else if (OpOpcode == ISD::UNDEF)
2522 return getUNDEF(VT);
2524 // (ext (trunx x)) -> x
2525 if (OpOpcode == ISD::TRUNCATE) {
2526 SDValue OpOp = Operand.getNode()->getOperand(0);
2527 if (OpOp.getValueType() == VT)
2532 assert(VT.isInteger() && Operand.getValueType().isInteger() &&
2533 "Invalid TRUNCATE!");
2534 if (Operand.getValueType() == VT) return Operand; // noop truncate
2535 assert(Operand.getValueType().getScalarType().bitsGT(VT.getScalarType()) &&
2536 "Invalid truncate node, src < dst!");
2537 assert((!VT.isVector() ||
2538 VT.getVectorNumElements() ==
2539 Operand.getValueType().getVectorNumElements()) &&
2540 "Vector element count mismatch!");
2541 if (OpOpcode == ISD::TRUNCATE)
2542 return getNode(ISD::TRUNCATE, DL, VT, Operand.getNode()->getOperand(0));
2543 else if (OpOpcode == ISD::ZERO_EXTEND || OpOpcode == ISD::SIGN_EXTEND ||
2544 OpOpcode == ISD::ANY_EXTEND) {
2545 // If the source is smaller than the dest, we still need an extend.
2546 if (Operand.getNode()->getOperand(0).getValueType().getScalarType()
2547 .bitsLT(VT.getScalarType()))
2548 return getNode(OpOpcode, DL, VT, Operand.getNode()->getOperand(0));
2549 else if (Operand.getNode()->getOperand(0).getValueType().bitsGT(VT))
2550 return getNode(ISD::TRUNCATE, DL, VT, Operand.getNode()->getOperand(0));
2552 return Operand.getNode()->getOperand(0);
2556 // Basic sanity checking.
2557 assert(VT.getSizeInBits() == Operand.getValueType().getSizeInBits()
2558 && "Cannot BITCAST between types of different sizes!");
2559 if (VT == Operand.getValueType()) return Operand; // noop conversion.
2560 if (OpOpcode == ISD::BITCAST) // bitconv(bitconv(x)) -> bitconv(x)
2561 return getNode(ISD::BITCAST, DL, VT, Operand.getOperand(0));
2562 if (OpOpcode == ISD::UNDEF)
2563 return getUNDEF(VT);
2565 case ISD::SCALAR_TO_VECTOR:
2566 assert(VT.isVector() && !Operand.getValueType().isVector() &&
2567 (VT.getVectorElementType() == Operand.getValueType() ||
2568 (VT.getVectorElementType().isInteger() &&
2569 Operand.getValueType().isInteger() &&
2570 VT.getVectorElementType().bitsLE(Operand.getValueType()))) &&
2571 "Illegal SCALAR_TO_VECTOR node!");
2572 if (OpOpcode == ISD::UNDEF)
2573 return getUNDEF(VT);
2574 // scalar_to_vector(extract_vector_elt V, 0) -> V, top bits are undefined.
2575 if (OpOpcode == ISD::EXTRACT_VECTOR_ELT &&
2576 isa<ConstantSDNode>(Operand.getOperand(1)) &&
2577 Operand.getConstantOperandVal(1) == 0 &&
2578 Operand.getOperand(0).getValueType() == VT)
2579 return Operand.getOperand(0);
2582 // -(X-Y) -> (Y-X) is unsafe because when X==Y, -0.0 != +0.0
2583 if (UnsafeFPMath && OpOpcode == ISD::FSUB)
2584 return getNode(ISD::FSUB, DL, VT, Operand.getNode()->getOperand(1),
2585 Operand.getNode()->getOperand(0));
2586 if (OpOpcode == ISD::FNEG) // --X -> X
2587 return Operand.getNode()->getOperand(0);
2590 if (OpOpcode == ISD::FNEG) // abs(-X) -> abs(X)
2591 return getNode(ISD::FABS, DL, VT, Operand.getNode()->getOperand(0));
2596 SDVTList VTs = getVTList(VT);
2597 if (VT != MVT::Glue) { // Don't CSE flag producing nodes
2598 FoldingSetNodeID ID;
2599 SDValue Ops[1] = { Operand };
2600 AddNodeIDNode(ID, Opcode, VTs, Ops, 1);
2602 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
2603 return SDValue(E, 0);
2605 N = new (NodeAllocator) UnarySDNode(Opcode, DL, VTs, Operand);
2606 CSEMap.InsertNode(N, IP);
2608 N = new (NodeAllocator) UnarySDNode(Opcode, DL, VTs, Operand);
2611 AllNodes.push_back(N);
2615 return SDValue(N, 0);
2618 SDValue SelectionDAG::FoldConstantArithmetic(unsigned Opcode,
2620 ConstantSDNode *Cst1,
2621 ConstantSDNode *Cst2) {
2622 const APInt &C1 = Cst1->getAPIntValue(), &C2 = Cst2->getAPIntValue();
2625 case ISD::ADD: return getConstant(C1 + C2, VT);
2626 case ISD::SUB: return getConstant(C1 - C2, VT);
2627 case ISD::MUL: return getConstant(C1 * C2, VT);
2629 if (C2.getBoolValue()) return getConstant(C1.udiv(C2), VT);
2632 if (C2.getBoolValue()) return getConstant(C1.urem(C2), VT);
2635 if (C2.getBoolValue()) return getConstant(C1.sdiv(C2), VT);
2638 if (C2.getBoolValue()) return getConstant(C1.srem(C2), VT);
2640 case ISD::AND: return getConstant(C1 & C2, VT);
2641 case ISD::OR: return getConstant(C1 | C2, VT);
2642 case ISD::XOR: return getConstant(C1 ^ C2, VT);
2643 case ISD::SHL: return getConstant(C1 << C2, VT);
2644 case ISD::SRL: return getConstant(C1.lshr(C2), VT);
2645 case ISD::SRA: return getConstant(C1.ashr(C2), VT);
2646 case ISD::ROTL: return getConstant(C1.rotl(C2), VT);
2647 case ISD::ROTR: return getConstant(C1.rotr(C2), VT);
2654 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT,
2655 SDValue N1, SDValue N2) {
2656 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.getNode());
2657 ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.getNode());
2660 case ISD::TokenFactor:
2661 assert(VT == MVT::Other && N1.getValueType() == MVT::Other &&
2662 N2.getValueType() == MVT::Other && "Invalid token factor!");
2663 // Fold trivial token factors.
2664 if (N1.getOpcode() == ISD::EntryToken) return N2;
2665 if (N2.getOpcode() == ISD::EntryToken) return N1;
2666 if (N1 == N2) return N1;
2668 case ISD::CONCAT_VECTORS:
2669 // A CONCAT_VECTOR with all operands BUILD_VECTOR can be simplified to
2670 // one big BUILD_VECTOR.
2671 if (N1.getOpcode() == ISD::BUILD_VECTOR &&
2672 N2.getOpcode() == ISD::BUILD_VECTOR) {
2673 SmallVector<SDValue, 16> Elts(N1.getNode()->op_begin(),
2674 N1.getNode()->op_end());
2675 Elts.append(N2.getNode()->op_begin(), N2.getNode()->op_end());
2676 return getNode(ISD::BUILD_VECTOR, DL, VT, &Elts[0], Elts.size());
2680 assert(VT.isInteger() && "This operator does not apply to FP types!");
2681 assert(N1.getValueType() == N2.getValueType() &&
2682 N1.getValueType() == VT && "Binary operator types must match!");
2683 // (X & 0) -> 0. This commonly occurs when legalizing i64 values, so it's
2684 // worth handling here.
2685 if (N2C && N2C->isNullValue())
2687 if (N2C && N2C->isAllOnesValue()) // X & -1 -> X
2694 assert(VT.isInteger() && "This operator does not apply to FP types!");
2695 assert(N1.getValueType() == N2.getValueType() &&
2696 N1.getValueType() == VT && "Binary operator types must match!");
2697 // (X ^|+- 0) -> X. This commonly occurs when legalizing i64 values, so
2698 // it's worth handling here.
2699 if (N2C && N2C->isNullValue())
2709 assert(VT.isInteger() && "This operator does not apply to FP types!");
2710 assert(N1.getValueType() == N2.getValueType() &&
2711 N1.getValueType() == VT && "Binary operator types must match!");
2719 if (Opcode == ISD::FADD) {
2721 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(N1))
2722 if (CFP->getValueAPF().isZero())
2725 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(N2))
2726 if (CFP->getValueAPF().isZero())
2728 } else if (Opcode == ISD::FSUB) {
2730 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(N2))
2731 if (CFP->getValueAPF().isZero())
2735 assert(VT.isFloatingPoint() && "This operator only applies to FP types!");
2736 assert(N1.getValueType() == N2.getValueType() &&
2737 N1.getValueType() == VT && "Binary operator types must match!");
2739 case ISD::FCOPYSIGN: // N1 and result must match. N1/N2 need not match.
2740 assert(N1.getValueType() == VT &&
2741 N1.getValueType().isFloatingPoint() &&
2742 N2.getValueType().isFloatingPoint() &&
2743 "Invalid FCOPYSIGN!");
2750 assert(VT == N1.getValueType() &&
2751 "Shift operators return type must be the same as their first arg");
2752 assert(VT.isInteger() && N2.getValueType().isInteger() &&
2753 "Shifts only work on integers");
2754 // Verify that the shift amount VT is bit enough to hold valid shift
2755 // amounts. This catches things like trying to shift an i1024 value by an
2756 // i8, which is easy to fall into in generic code that uses
2757 // TLI.getShiftAmount().
2758 assert(N2.getValueType().getSizeInBits() >=
2759 Log2_32_Ceil(N1.getValueType().getSizeInBits()) &&
2760 "Invalid use of small shift amount with oversized value!");
2762 // Always fold shifts of i1 values so the code generator doesn't need to
2763 // handle them. Since we know the size of the shift has to be less than the
2764 // size of the value, the shift/rotate count is guaranteed to be zero.
2767 if (N2C && N2C->isNullValue())
2770 case ISD::FP_ROUND_INREG: {
2771 EVT EVT = cast<VTSDNode>(N2)->getVT();
2772 assert(VT == N1.getValueType() && "Not an inreg round!");
2773 assert(VT.isFloatingPoint() && EVT.isFloatingPoint() &&
2774 "Cannot FP_ROUND_INREG integer types");
2775 assert(EVT.isVector() == VT.isVector() &&
2776 "FP_ROUND_INREG type should be vector iff the operand "
2778 assert((!EVT.isVector() ||
2779 EVT.getVectorNumElements() == VT.getVectorNumElements()) &&
2780 "Vector element counts must match in FP_ROUND_INREG");
2781 assert(EVT.bitsLE(VT) && "Not rounding down!");
2782 if (cast<VTSDNode>(N2)->getVT() == VT) return N1; // Not actually rounding.
2786 assert(VT.isFloatingPoint() &&
2787 N1.getValueType().isFloatingPoint() &&
2788 VT.bitsLE(N1.getValueType()) &&
2789 isa<ConstantSDNode>(N2) && "Invalid FP_ROUND!");
2790 if (N1.getValueType() == VT) return N1; // noop conversion.
2792 case ISD::AssertSext:
2793 case ISD::AssertZext: {
2794 EVT EVT = cast<VTSDNode>(N2)->getVT();
2795 assert(VT == N1.getValueType() && "Not an inreg extend!");
2796 assert(VT.isInteger() && EVT.isInteger() &&
2797 "Cannot *_EXTEND_INREG FP types");
2798 assert(!EVT.isVector() &&
2799 "AssertSExt/AssertZExt type should be the vector element type "
2800 "rather than the vector type!");
2801 assert(EVT.bitsLE(VT) && "Not extending!");
2802 if (VT == EVT) return N1; // noop assertion.
2805 case ISD::SIGN_EXTEND_INREG: {
2806 EVT EVT = cast<VTSDNode>(N2)->getVT();
2807 assert(VT == N1.getValueType() && "Not an inreg extend!");
2808 assert(VT.isInteger() && EVT.isInteger() &&
2809 "Cannot *_EXTEND_INREG FP types");
2810 assert(EVT.isVector() == VT.isVector() &&
2811 "SIGN_EXTEND_INREG type should be vector iff the operand "
2813 assert((!EVT.isVector() ||
2814 EVT.getVectorNumElements() == VT.getVectorNumElements()) &&
2815 "Vector element counts must match in SIGN_EXTEND_INREG");
2816 assert(EVT.bitsLE(VT) && "Not extending!");
2817 if (EVT == VT) return N1; // Not actually extending
2820 APInt Val = N1C->getAPIntValue();
2821 unsigned FromBits = EVT.getScalarType().getSizeInBits();
2822 Val <<= Val.getBitWidth()-FromBits;
2823 Val = Val.ashr(Val.getBitWidth()-FromBits);
2824 return getConstant(Val, VT);
2828 case ISD::EXTRACT_VECTOR_ELT:
2829 // EXTRACT_VECTOR_ELT of an UNDEF is an UNDEF.
2830 if (N1.getOpcode() == ISD::UNDEF)
2831 return getUNDEF(VT);
2833 // EXTRACT_VECTOR_ELT of CONCAT_VECTORS is often formed while lowering is
2834 // expanding copies of large vectors from registers.
2836 N1.getOpcode() == ISD::CONCAT_VECTORS &&
2837 N1.getNumOperands() > 0) {
2839 N1.getOperand(0).getValueType().getVectorNumElements();
2840 return getNode(ISD::EXTRACT_VECTOR_ELT, DL, VT,
2841 N1.getOperand(N2C->getZExtValue() / Factor),
2842 getConstant(N2C->getZExtValue() % Factor,
2843 N2.getValueType()));
2846 // EXTRACT_VECTOR_ELT of BUILD_VECTOR is often formed while lowering is
2847 // expanding large vector constants.
2848 if (N2C && N1.getOpcode() == ISD::BUILD_VECTOR) {
2849 SDValue Elt = N1.getOperand(N2C->getZExtValue());
2850 EVT VEltTy = N1.getValueType().getVectorElementType();
2851 if (Elt.getValueType() != VEltTy) {
2852 // If the vector element type is not legal, the BUILD_VECTOR operands
2853 // are promoted and implicitly truncated. Make that explicit here.
2854 Elt = getNode(ISD::TRUNCATE, DL, VEltTy, Elt);
2857 // If the vector element type is not legal, the EXTRACT_VECTOR_ELT
2858 // result is implicitly extended.
2859 Elt = getNode(ISD::ANY_EXTEND, DL, VT, Elt);
2864 // EXTRACT_VECTOR_ELT of INSERT_VECTOR_ELT is often formed when vector
2865 // operations are lowered to scalars.
2866 if (N1.getOpcode() == ISD::INSERT_VECTOR_ELT) {
2867 // If the indices are the same, return the inserted element else
2868 // if the indices are known different, extract the element from
2869 // the original vector.
2870 SDValue N1Op2 = N1.getOperand(2);
2871 ConstantSDNode *N1Op2C = dyn_cast<ConstantSDNode>(N1Op2.getNode());
2873 if (N1Op2C && N2C) {
2874 if (N1Op2C->getZExtValue() == N2C->getZExtValue()) {
2875 if (VT == N1.getOperand(1).getValueType())
2876 return N1.getOperand(1);
2878 return getSExtOrTrunc(N1.getOperand(1), DL, VT);
2881 return getNode(ISD::EXTRACT_VECTOR_ELT, DL, VT, N1.getOperand(0), N2);
2885 case ISD::EXTRACT_ELEMENT:
2886 assert(N2C && (unsigned)N2C->getZExtValue() < 2 && "Bad EXTRACT_ELEMENT!");
2887 assert(!N1.getValueType().isVector() && !VT.isVector() &&
2888 (N1.getValueType().isInteger() == VT.isInteger()) &&
2889 "Wrong types for EXTRACT_ELEMENT!");
2891 // EXTRACT_ELEMENT of BUILD_PAIR is often formed while legalize is expanding
2892 // 64-bit integers into 32-bit parts. Instead of building the extract of
2893 // the BUILD_PAIR, only to have legalize rip it apart, just do it now.
2894 if (N1.getOpcode() == ISD::BUILD_PAIR)
2895 return N1.getOperand(N2C->getZExtValue());
2897 // EXTRACT_ELEMENT of a constant int is also very common.
2898 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N1)) {
2899 unsigned ElementSize = VT.getSizeInBits();
2900 unsigned Shift = ElementSize * N2C->getZExtValue();
2901 APInt ShiftedVal = C->getAPIntValue().lshr(Shift);
2902 return getConstant(ShiftedVal.trunc(ElementSize), VT);
2905 case ISD::EXTRACT_SUBVECTOR: {
2907 if (VT.isSimple() && N1.getValueType().isSimple()) {
2908 assert(VT.isVector() && N1.getValueType().isVector() &&
2909 "Extract subvector VTs must be a vectors!");
2910 assert(VT.getVectorElementType() == N1.getValueType().getVectorElementType() &&
2911 "Extract subvector VTs must have the same element type!");
2912 assert(VT.getSimpleVT() <= N1.getValueType().getSimpleVT() &&
2913 "Extract subvector must be from larger vector to smaller vector!");
2915 if (isa<ConstantSDNode>(Index.getNode())) {
2916 assert((VT.getVectorNumElements() +
2917 cast<ConstantSDNode>(Index.getNode())->getZExtValue()
2918 <= N1.getValueType().getVectorNumElements())
2919 && "Extract subvector overflow!");
2922 // Trivial extraction.
2923 if (VT.getSimpleVT() == N1.getValueType().getSimpleVT())
2932 SDValue SV = FoldConstantArithmetic(Opcode, VT, N1C, N2C);
2933 if (SV.getNode()) return SV;
2934 } else { // Cannonicalize constant to RHS if commutative
2935 if (isCommutativeBinOp(Opcode)) {
2936 std::swap(N1C, N2C);
2942 // Constant fold FP operations.
2943 ConstantFPSDNode *N1CFP = dyn_cast<ConstantFPSDNode>(N1.getNode());
2944 ConstantFPSDNode *N2CFP = dyn_cast<ConstantFPSDNode>(N2.getNode());
2946 if (!N2CFP && isCommutativeBinOp(Opcode)) {
2947 // Cannonicalize constant to RHS if commutative
2948 std::swap(N1CFP, N2CFP);
2950 } else if (N2CFP && VT != MVT::ppcf128) {
2951 APFloat V1 = N1CFP->getValueAPF(), V2 = N2CFP->getValueAPF();
2952 APFloat::opStatus s;
2955 s = V1.add(V2, APFloat::rmNearestTiesToEven);
2956 if (s != APFloat::opInvalidOp)
2957 return getConstantFP(V1, VT);
2960 s = V1.subtract(V2, APFloat::rmNearestTiesToEven);
2961 if (s!=APFloat::opInvalidOp)
2962 return getConstantFP(V1, VT);
2965 s = V1.multiply(V2, APFloat::rmNearestTiesToEven);
2966 if (s!=APFloat::opInvalidOp)
2967 return getConstantFP(V1, VT);
2970 s = V1.divide(V2, APFloat::rmNearestTiesToEven);
2971 if (s!=APFloat::opInvalidOp && s!=APFloat::opDivByZero)
2972 return getConstantFP(V1, VT);
2975 s = V1.mod(V2, APFloat::rmNearestTiesToEven);
2976 if (s!=APFloat::opInvalidOp && s!=APFloat::opDivByZero)
2977 return getConstantFP(V1, VT);
2979 case ISD::FCOPYSIGN:
2981 return getConstantFP(V1, VT);
2987 // Canonicalize an UNDEF to the RHS, even over a constant.
2988 if (N1.getOpcode() == ISD::UNDEF) {
2989 if (isCommutativeBinOp(Opcode)) {
2993 case ISD::FP_ROUND_INREG:
2994 case ISD::SIGN_EXTEND_INREG:
3000 return N1; // fold op(undef, arg2) -> undef
3008 return getConstant(0, VT); // fold op(undef, arg2) -> 0
3009 // For vectors, we can't easily build an all zero vector, just return
3016 // Fold a bunch of operators when the RHS is undef.
3017 if (N2.getOpcode() == ISD::UNDEF) {
3020 if (N1.getOpcode() == ISD::UNDEF)
3021 // Handle undef ^ undef -> 0 special case. This is a common
3023 return getConstant(0, VT);
3033 return N2; // fold op(arg1, undef) -> undef
3047 return getConstant(0, VT); // fold op(arg1, undef) -> 0
3048 // For vectors, we can't easily build an all zero vector, just return
3053 return getConstant(APInt::getAllOnesValue(VT.getSizeInBits()), VT);
3054 // For vectors, we can't easily build an all one vector, just return
3062 // Memoize this node if possible.
3064 SDVTList VTs = getVTList(VT);
3065 if (VT != MVT::Glue) {
3066 SDValue Ops[] = { N1, N2 };
3067 FoldingSetNodeID ID;
3068 AddNodeIDNode(ID, Opcode, VTs, Ops, 2);
3070 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
3071 return SDValue(E, 0);
3073 N = new (NodeAllocator) BinarySDNode(Opcode, DL, VTs, N1, N2);
3074 CSEMap.InsertNode(N, IP);
3076 N = new (NodeAllocator) BinarySDNode(Opcode, DL, VTs, N1, N2);
3079 AllNodes.push_back(N);
3083 return SDValue(N, 0);
3086 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT,
3087 SDValue N1, SDValue N2, SDValue N3) {
3088 // Perform various simplifications.
3089 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.getNode());
3091 case ISD::CONCAT_VECTORS:
3092 // A CONCAT_VECTOR with all operands BUILD_VECTOR can be simplified to
3093 // one big BUILD_VECTOR.
3094 if (N1.getOpcode() == ISD::BUILD_VECTOR &&
3095 N2.getOpcode() == ISD::BUILD_VECTOR &&
3096 N3.getOpcode() == ISD::BUILD_VECTOR) {
3097 SmallVector<SDValue, 16> Elts(N1.getNode()->op_begin(),
3098 N1.getNode()->op_end());
3099 Elts.append(N2.getNode()->op_begin(), N2.getNode()->op_end());
3100 Elts.append(N3.getNode()->op_begin(), N3.getNode()->op_end());
3101 return getNode(ISD::BUILD_VECTOR, DL, VT, &Elts[0], Elts.size());
3105 // Use FoldSetCC to simplify SETCC's.
3106 SDValue Simp = FoldSetCC(VT, N1, N2, cast<CondCodeSDNode>(N3)->get(), DL);
3107 if (Simp.getNode()) return Simp;
3112 if (N1C->getZExtValue())
3113 return N2; // select true, X, Y -> X
3115 return N3; // select false, X, Y -> Y
3118 if (N2 == N3) return N2; // select C, X, X -> X
3120 case ISD::VECTOR_SHUFFLE:
3121 llvm_unreachable("should use getVectorShuffle constructor!");
3123 case ISD::INSERT_SUBVECTOR: {
3125 if (VT.isSimple() && N1.getValueType().isSimple()
3126 && N2.getValueType().isSimple()) {
3127 assert(VT.isVector() && N1.getValueType().isVector() &&
3128 N2.getValueType().isVector() &&
3129 "Insert subvector VTs must be a vectors");
3130 assert(VT == N1.getValueType() &&
3131 "Dest and insert subvector source types must match!");
3132 assert(N2.getValueType().getSimpleVT() <= N1.getValueType().getSimpleVT() &&
3133 "Insert subvector must be from smaller vector to larger vector!");
3134 if (isa<ConstantSDNode>(Index.getNode())) {
3135 assert((N2.getValueType().getVectorNumElements() +
3136 cast<ConstantSDNode>(Index.getNode())->getZExtValue()
3137 <= VT.getVectorNumElements())
3138 && "Insert subvector overflow!");
3141 // Trivial insertion.
3142 if (VT.getSimpleVT() == N2.getValueType().getSimpleVT())
3148 // Fold bit_convert nodes from a type to themselves.
3149 if (N1.getValueType() == VT)
3154 // Memoize node if it doesn't produce a flag.
3156 SDVTList VTs = getVTList(VT);
3157 if (VT != MVT::Glue) {
3158 SDValue Ops[] = { N1, N2, N3 };
3159 FoldingSetNodeID ID;
3160 AddNodeIDNode(ID, Opcode, VTs, Ops, 3);
3162 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
3163 return SDValue(E, 0);
3165 N = new (NodeAllocator) TernarySDNode(Opcode, DL, VTs, N1, N2, N3);
3166 CSEMap.InsertNode(N, IP);
3168 N = new (NodeAllocator) TernarySDNode(Opcode, DL, VTs, N1, N2, N3);
3171 AllNodes.push_back(N);
3175 return SDValue(N, 0);
3178 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT,
3179 SDValue N1, SDValue N2, SDValue N3,
3181 SDValue Ops[] = { N1, N2, N3, N4 };
3182 return getNode(Opcode, DL, VT, Ops, 4);
3185 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT,
3186 SDValue N1, SDValue N2, SDValue N3,
3187 SDValue N4, SDValue N5) {
3188 SDValue Ops[] = { N1, N2, N3, N4, N5 };
3189 return getNode(Opcode, DL, VT, Ops, 5);
3192 /// getStackArgumentTokenFactor - Compute a TokenFactor to force all
3193 /// the incoming stack arguments to be loaded from the stack.
3194 SDValue SelectionDAG::getStackArgumentTokenFactor(SDValue Chain) {
3195 SmallVector<SDValue, 8> ArgChains;
3197 // Include the original chain at the beginning of the list. When this is
3198 // used by target LowerCall hooks, this helps legalize find the
3199 // CALLSEQ_BEGIN node.
3200 ArgChains.push_back(Chain);
3202 // Add a chain value for each stack argument.
3203 for (SDNode::use_iterator U = getEntryNode().getNode()->use_begin(),
3204 UE = getEntryNode().getNode()->use_end(); U != UE; ++U)
3205 if (LoadSDNode *L = dyn_cast<LoadSDNode>(*U))
3206 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(L->getBasePtr()))
3207 if (FI->getIndex() < 0)
3208 ArgChains.push_back(SDValue(L, 1));
3210 // Build a tokenfactor for all the chains.
3211 return getNode(ISD::TokenFactor, Chain.getDebugLoc(), MVT::Other,
3212 &ArgChains[0], ArgChains.size());
3215 /// SplatByte - Distribute ByteVal over NumBits bits.
3216 static APInt SplatByte(unsigned NumBits, uint8_t ByteVal) {
3217 APInt Val = APInt(NumBits, ByteVal);
3219 for (unsigned i = NumBits; i > 8; i >>= 1) {
3220 Val = (Val << Shift) | Val;
3226 /// getMemsetValue - Vectorized representation of the memset value
3228 static SDValue getMemsetValue(SDValue Value, EVT VT, SelectionDAG &DAG,
3230 assert(Value.getOpcode() != ISD::UNDEF);
3232 unsigned NumBits = VT.getScalarType().getSizeInBits();
3233 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Value)) {
3234 APInt Val = SplatByte(NumBits, C->getZExtValue() & 255);
3236 return DAG.getConstant(Val, VT);
3237 return DAG.getConstantFP(APFloat(Val), VT);
3240 Value = DAG.getNode(ISD::ZERO_EXTEND, dl, VT, Value);
3242 // Use a multiplication with 0x010101... to extend the input to the
3244 APInt Magic = SplatByte(NumBits, 0x01);
3245 Value = DAG.getNode(ISD::MUL, dl, VT, Value, DAG.getConstant(Magic, VT));
3251 /// getMemsetStringVal - Similar to getMemsetValue. Except this is only
3252 /// used when a memcpy is turned into a memset when the source is a constant
3254 static SDValue getMemsetStringVal(EVT VT, DebugLoc dl, SelectionDAG &DAG,
3255 const TargetLowering &TLI,
3256 std::string &Str, unsigned Offset) {
3257 // Handle vector with all elements zero.
3260 return DAG.getConstant(0, VT);
3261 else if (VT == MVT::f32 || VT == MVT::f64)
3262 return DAG.getConstantFP(0.0, VT);
3263 else if (VT.isVector()) {
3264 unsigned NumElts = VT.getVectorNumElements();
3265 MVT EltVT = (VT.getVectorElementType() == MVT::f32) ? MVT::i32 : MVT::i64;
3266 return DAG.getNode(ISD::BITCAST, dl, VT,
3267 DAG.getConstant(0, EVT::getVectorVT(*DAG.getContext(),
3270 llvm_unreachable("Expected type!");
3273 assert(!VT.isVector() && "Can't handle vector type here!");
3274 unsigned NumBits = VT.getSizeInBits();
3275 unsigned MSB = NumBits / 8;
3277 if (TLI.isLittleEndian())
3278 Offset = Offset + MSB - 1;
3279 for (unsigned i = 0; i != MSB; ++i) {
3280 Val = (Val << 8) | (unsigned char)Str[Offset];
3281 Offset += TLI.isLittleEndian() ? -1 : 1;
3283 return DAG.getConstant(Val, VT);
3286 /// getMemBasePlusOffset - Returns base and offset node for the
3288 static SDValue getMemBasePlusOffset(SDValue Base, unsigned Offset,
3289 SelectionDAG &DAG) {
3290 EVT VT = Base.getValueType();
3291 return DAG.getNode(ISD::ADD, Base.getDebugLoc(),
3292 VT, Base, DAG.getConstant(Offset, VT));
3295 /// isMemSrcFromString - Returns true if memcpy source is a string constant.
3297 static bool isMemSrcFromString(SDValue Src, std::string &Str) {
3298 unsigned SrcDelta = 0;
3299 GlobalAddressSDNode *G = NULL;
3300 if (Src.getOpcode() == ISD::GlobalAddress)
3301 G = cast<GlobalAddressSDNode>(Src);
3302 else if (Src.getOpcode() == ISD::ADD &&
3303 Src.getOperand(0).getOpcode() == ISD::GlobalAddress &&
3304 Src.getOperand(1).getOpcode() == ISD::Constant) {
3305 G = cast<GlobalAddressSDNode>(Src.getOperand(0));
3306 SrcDelta = cast<ConstantSDNode>(Src.getOperand(1))->getZExtValue();
3311 const GlobalVariable *GV = dyn_cast<GlobalVariable>(G->getGlobal());
3312 if (GV && GetConstantStringInfo(GV, Str, SrcDelta, false))
3318 /// FindOptimalMemOpLowering - Determines the optimial series memory ops
3319 /// to replace the memset / memcpy. Return true if the number of memory ops
3320 /// is below the threshold. It returns the types of the sequence of
3321 /// memory ops to perform memset / memcpy by reference.
3322 static bool FindOptimalMemOpLowering(std::vector<EVT> &MemOps,
3323 unsigned Limit, uint64_t Size,
3324 unsigned DstAlign, unsigned SrcAlign,
3325 bool NonScalarIntSafe,
3328 const TargetLowering &TLI) {
3329 assert((SrcAlign == 0 || SrcAlign >= DstAlign) &&
3330 "Expecting memcpy / memset source to meet alignment requirement!");
3331 // If 'SrcAlign' is zero, that means the memory operation does not need load
3332 // the value, i.e. memset or memcpy from constant string. Otherwise, it's
3333 // the inferred alignment of the source. 'DstAlign', on the other hand, is the
3334 // specified alignment of the memory operation. If it is zero, that means
3335 // it's possible to change the alignment of the destination. 'MemcpyStrSrc'
3336 // indicates whether the memcpy source is constant so it does not need to be
3338 EVT VT = TLI.getOptimalMemOpType(Size, DstAlign, SrcAlign,
3339 NonScalarIntSafe, MemcpyStrSrc,
3340 DAG.getMachineFunction());
3342 if (VT == MVT::Other) {
3343 if (DstAlign >= TLI.getTargetData()->getPointerPrefAlignment() ||
3344 TLI.allowsUnalignedMemoryAccesses(VT)) {
3345 VT = TLI.getPointerTy();
3347 switch (DstAlign & 7) {
3348 case 0: VT = MVT::i64; break;
3349 case 4: VT = MVT::i32; break;
3350 case 2: VT = MVT::i16; break;
3351 default: VT = MVT::i8; break;
3356 while (!TLI.isTypeLegal(LVT))
3357 LVT = (MVT::SimpleValueType)(LVT.SimpleTy - 1);
3358 assert(LVT.isInteger());
3364 unsigned NumMemOps = 0;
3366 unsigned VTSize = VT.getSizeInBits() / 8;
3367 while (VTSize > Size) {
3368 // For now, only use non-vector load / store's for the left-over pieces.
3369 if (VT.isVector() || VT.isFloatingPoint()) {
3371 while (!TLI.isTypeLegal(VT))
3372 VT = (MVT::SimpleValueType)(VT.getSimpleVT().SimpleTy - 1);
3373 VTSize = VT.getSizeInBits() / 8;
3375 // This can result in a type that is not legal on the target, e.g.
3376 // 1 or 2 bytes on PPC.
3377 VT = (MVT::SimpleValueType)(VT.getSimpleVT().SimpleTy - 1);
3382 if (++NumMemOps > Limit)
3384 MemOps.push_back(VT);
3391 static SDValue getMemcpyLoadsAndStores(SelectionDAG &DAG, DebugLoc dl,
3392 SDValue Chain, SDValue Dst,
3393 SDValue Src, uint64_t Size,
3394 unsigned Align, bool isVol,
3396 MachinePointerInfo DstPtrInfo,
3397 MachinePointerInfo SrcPtrInfo) {
3398 // Turn a memcpy of undef to nop.
3399 if (Src.getOpcode() == ISD::UNDEF)
3402 // Expand memcpy to a series of load and store ops if the size operand falls
3403 // below a certain threshold.
3404 // TODO: In the AlwaysInline case, if the size is big then generate a loop
3405 // rather than maybe a humongous number of loads and stores.
3406 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
3407 std::vector<EVT> MemOps;
3408 bool DstAlignCanChange = false;
3409 MachineFunction &MF = DAG.getMachineFunction();
3410 MachineFrameInfo *MFI = MF.getFrameInfo();
3411 bool OptSize = MF.getFunction()->hasFnAttr(Attribute::OptimizeForSize);
3412 FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Dst);
3413 if (FI && !MFI->isFixedObjectIndex(FI->getIndex()))
3414 DstAlignCanChange = true;
3415 unsigned SrcAlign = DAG.InferPtrAlignment(Src);
3416 if (Align > SrcAlign)
3419 bool CopyFromStr = isMemSrcFromString(Src, Str);
3420 bool isZeroStr = CopyFromStr && Str.empty();
3421 unsigned Limit = AlwaysInline ? ~0U : TLI.getMaxStoresPerMemcpy(OptSize);
3423 if (!FindOptimalMemOpLowering(MemOps, Limit, Size,
3424 (DstAlignCanChange ? 0 : Align),
3425 (isZeroStr ? 0 : SrcAlign),
3426 true, CopyFromStr, DAG, TLI))
3429 if (DstAlignCanChange) {
3430 const Type *Ty = MemOps[0].getTypeForEVT(*DAG.getContext());
3431 unsigned NewAlign = (unsigned) TLI.getTargetData()->getABITypeAlignment(Ty);
3432 if (NewAlign > Align) {
3433 // Give the stack frame object a larger alignment if needed.
3434 if (MFI->getObjectAlignment(FI->getIndex()) < NewAlign)
3435 MFI->setObjectAlignment(FI->getIndex(), NewAlign);
3440 SmallVector<SDValue, 8> OutChains;
3441 unsigned NumMemOps = MemOps.size();
3442 uint64_t SrcOff = 0, DstOff = 0;
3443 for (unsigned i = 0; i != NumMemOps; ++i) {
3445 unsigned VTSize = VT.getSizeInBits() / 8;
3446 SDValue Value, Store;
3449 (isZeroStr || (VT.isInteger() && !VT.isVector()))) {
3450 // It's unlikely a store of a vector immediate can be done in a single
3451 // instruction. It would require a load from a constantpool first.
3452 // We only handle zero vectors here.
3453 // FIXME: Handle other cases where store of vector immediate is done in
3454 // a single instruction.
3455 Value = getMemsetStringVal(VT, dl, DAG, TLI, Str, SrcOff);
3456 Store = DAG.getStore(Chain, dl, Value,
3457 getMemBasePlusOffset(Dst, DstOff, DAG),
3458 DstPtrInfo.getWithOffset(DstOff), isVol,
3461 // The type might not be legal for the target. This should only happen
3462 // if the type is smaller than a legal type, as on PPC, so the right
3463 // thing to do is generate a LoadExt/StoreTrunc pair. These simplify
3464 // to Load/Store if NVT==VT.
3465 // FIXME does the case above also need this?
3466 EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), VT);
3467 assert(NVT.bitsGE(VT));
3468 Value = DAG.getExtLoad(ISD::EXTLOAD, dl, NVT, Chain,
3469 getMemBasePlusOffset(Src, SrcOff, DAG),
3470 SrcPtrInfo.getWithOffset(SrcOff), VT, isVol, false,
3471 MinAlign(SrcAlign, SrcOff));
3472 Store = DAG.getTruncStore(Chain, dl, Value,
3473 getMemBasePlusOffset(Dst, DstOff, DAG),
3474 DstPtrInfo.getWithOffset(DstOff), VT, isVol,
3477 OutChains.push_back(Store);
3482 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
3483 &OutChains[0], OutChains.size());
3486 static SDValue getMemmoveLoadsAndStores(SelectionDAG &DAG, DebugLoc dl,
3487 SDValue Chain, SDValue Dst,
3488 SDValue Src, uint64_t Size,
3489 unsigned Align, bool isVol,
3491 MachinePointerInfo DstPtrInfo,
3492 MachinePointerInfo SrcPtrInfo) {
3493 // Turn a memmove of undef to nop.
3494 if (Src.getOpcode() == ISD::UNDEF)
3497 // Expand memmove to a series of load and store ops if the size operand falls
3498 // below a certain threshold.
3499 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
3500 std::vector<EVT> MemOps;
3501 bool DstAlignCanChange = false;
3502 MachineFunction &MF = DAG.getMachineFunction();
3503 MachineFrameInfo *MFI = MF.getFrameInfo();
3504 bool OptSize = MF.getFunction()->hasFnAttr(Attribute::OptimizeForSize);
3505 FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Dst);
3506 if (FI && !MFI->isFixedObjectIndex(FI->getIndex()))
3507 DstAlignCanChange = true;
3508 unsigned SrcAlign = DAG.InferPtrAlignment(Src);
3509 if (Align > SrcAlign)
3511 unsigned Limit = AlwaysInline ? ~0U : TLI.getMaxStoresPerMemmove(OptSize);
3513 if (!FindOptimalMemOpLowering(MemOps, Limit, Size,
3514 (DstAlignCanChange ? 0 : Align),
3515 SrcAlign, true, false, DAG, TLI))
3518 if (DstAlignCanChange) {
3519 const Type *Ty = MemOps[0].getTypeForEVT(*DAG.getContext());
3520 unsigned NewAlign = (unsigned) TLI.getTargetData()->getABITypeAlignment(Ty);
3521 if (NewAlign > Align) {
3522 // Give the stack frame object a larger alignment if needed.
3523 if (MFI->getObjectAlignment(FI->getIndex()) < NewAlign)
3524 MFI->setObjectAlignment(FI->getIndex(), NewAlign);
3529 uint64_t SrcOff = 0, DstOff = 0;
3530 SmallVector<SDValue, 8> LoadValues;
3531 SmallVector<SDValue, 8> LoadChains;
3532 SmallVector<SDValue, 8> OutChains;
3533 unsigned NumMemOps = MemOps.size();
3534 for (unsigned i = 0; i < NumMemOps; i++) {
3536 unsigned VTSize = VT.getSizeInBits() / 8;
3537 SDValue Value, Store;
3539 Value = DAG.getLoad(VT, dl, Chain,
3540 getMemBasePlusOffset(Src, SrcOff, DAG),
3541 SrcPtrInfo.getWithOffset(SrcOff), isVol,
3543 LoadValues.push_back(Value);
3544 LoadChains.push_back(Value.getValue(1));
3547 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
3548 &LoadChains[0], LoadChains.size());
3550 for (unsigned i = 0; i < NumMemOps; i++) {
3552 unsigned VTSize = VT.getSizeInBits() / 8;
3553 SDValue Value, Store;
3555 Store = DAG.getStore(Chain, dl, LoadValues[i],
3556 getMemBasePlusOffset(Dst, DstOff, DAG),
3557 DstPtrInfo.getWithOffset(DstOff), isVol, false, Align);
3558 OutChains.push_back(Store);
3562 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
3563 &OutChains[0], OutChains.size());
3566 static SDValue getMemsetStores(SelectionDAG &DAG, DebugLoc dl,
3567 SDValue Chain, SDValue Dst,
3568 SDValue Src, uint64_t Size,
3569 unsigned Align, bool isVol,
3570 MachinePointerInfo DstPtrInfo) {
3571 // Turn a memset of undef to nop.
3572 if (Src.getOpcode() == ISD::UNDEF)
3575 // Expand memset to a series of load/store ops if the size operand
3576 // falls below a certain threshold.
3577 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
3578 std::vector<EVT> MemOps;
3579 bool DstAlignCanChange = false;
3580 MachineFunction &MF = DAG.getMachineFunction();
3581 MachineFrameInfo *MFI = MF.getFrameInfo();
3582 bool OptSize = MF.getFunction()->hasFnAttr(Attribute::OptimizeForSize);
3583 FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Dst);
3584 if (FI && !MFI->isFixedObjectIndex(FI->getIndex()))
3585 DstAlignCanChange = true;
3586 bool NonScalarIntSafe =
3587 isa<ConstantSDNode>(Src) && cast<ConstantSDNode>(Src)->isNullValue();
3588 if (!FindOptimalMemOpLowering(MemOps, TLI.getMaxStoresPerMemset(OptSize),
3589 Size, (DstAlignCanChange ? 0 : Align), 0,
3590 NonScalarIntSafe, false, DAG, TLI))
3593 if (DstAlignCanChange) {
3594 const Type *Ty = MemOps[0].getTypeForEVT(*DAG.getContext());
3595 unsigned NewAlign = (unsigned) TLI.getTargetData()->getABITypeAlignment(Ty);
3596 if (NewAlign > Align) {
3597 // Give the stack frame object a larger alignment if needed.
3598 if (MFI->getObjectAlignment(FI->getIndex()) < NewAlign)
3599 MFI->setObjectAlignment(FI->getIndex(), NewAlign);
3604 SmallVector<SDValue, 8> OutChains;
3605 uint64_t DstOff = 0;
3606 unsigned NumMemOps = MemOps.size();
3608 // Find the largest store and generate the bit pattern for it.
3609 EVT LargestVT = MemOps[0];
3610 for (unsigned i = 1; i < NumMemOps; i++)
3611 if (MemOps[i].bitsGT(LargestVT))
3612 LargestVT = MemOps[i];
3613 SDValue MemSetValue = getMemsetValue(Src, LargestVT, DAG, dl);
3615 for (unsigned i = 0; i < NumMemOps; i++) {
3618 // If this store is smaller than the largest store see whether we can get
3619 // the smaller value for free with a truncate.
3620 SDValue Value = MemSetValue;
3621 if (VT.bitsLT(LargestVT)) {
3622 if (!LargestVT.isVector() && !VT.isVector() &&
3623 TLI.isTruncateFree(LargestVT, VT))
3624 Value = DAG.getNode(ISD::TRUNCATE, dl, VT, MemSetValue);
3626 Value = getMemsetValue(Src, VT, DAG, dl);
3628 assert(Value.getValueType() == VT && "Value with wrong type.");
3629 SDValue Store = DAG.getStore(Chain, dl, Value,
3630 getMemBasePlusOffset(Dst, DstOff, DAG),
3631 DstPtrInfo.getWithOffset(DstOff),
3632 isVol, false, Align);
3633 OutChains.push_back(Store);
3634 DstOff += VT.getSizeInBits() / 8;
3637 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
3638 &OutChains[0], OutChains.size());
3641 SDValue SelectionDAG::getMemcpy(SDValue Chain, DebugLoc dl, SDValue Dst,
3642 SDValue Src, SDValue Size,
3643 unsigned Align, bool isVol, bool AlwaysInline,
3644 MachinePointerInfo DstPtrInfo,
3645 MachinePointerInfo SrcPtrInfo) {
3647 // Check to see if we should lower the memcpy to loads and stores first.
3648 // For cases within the target-specified limits, this is the best choice.
3649 ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size);
3651 // Memcpy with size zero? Just return the original chain.
3652 if (ConstantSize->isNullValue())
3655 SDValue Result = getMemcpyLoadsAndStores(*this, dl, Chain, Dst, Src,
3656 ConstantSize->getZExtValue(),Align,
3657 isVol, false, DstPtrInfo, SrcPtrInfo);
3658 if (Result.getNode())
3662 // Then check to see if we should lower the memcpy with target-specific
3663 // code. If the target chooses to do this, this is the next best.
3665 TSI.EmitTargetCodeForMemcpy(*this, dl, Chain, Dst, Src, Size, Align,
3666 isVol, AlwaysInline,
3667 DstPtrInfo, SrcPtrInfo);
3668 if (Result.getNode())
3671 // If we really need inline code and the target declined to provide it,
3672 // use a (potentially long) sequence of loads and stores.
3674 assert(ConstantSize && "AlwaysInline requires a constant size!");
3675 return getMemcpyLoadsAndStores(*this, dl, Chain, Dst, Src,
3676 ConstantSize->getZExtValue(), Align, isVol,
3677 true, DstPtrInfo, SrcPtrInfo);
3680 // FIXME: If the memcpy is volatile (isVol), lowering it to a plain libc
3681 // memcpy is not guaranteed to be safe. libc memcpys aren't required to
3682 // respect volatile, so they may do things like read or write memory
3683 // beyond the given memory regions. But fixing this isn't easy, and most
3684 // people don't care.
3686 // Emit a library call.
3687 TargetLowering::ArgListTy Args;
3688 TargetLowering::ArgListEntry Entry;
3689 Entry.Ty = TLI.getTargetData()->getIntPtrType(*getContext());
3690 Entry.Node = Dst; Args.push_back(Entry);
3691 Entry.Node = Src; Args.push_back(Entry);
3692 Entry.Node = Size; Args.push_back(Entry);
3693 // FIXME: pass in DebugLoc
3694 std::pair<SDValue,SDValue> CallResult =
3695 TLI.LowerCallTo(Chain, Type::getVoidTy(*getContext()),
3696 false, false, false, false, 0,
3697 TLI.getLibcallCallingConv(RTLIB::MEMCPY), false,
3698 /*isReturnValueUsed=*/false,
3699 getExternalSymbol(TLI.getLibcallName(RTLIB::MEMCPY),
3700 TLI.getPointerTy()),
3702 return CallResult.second;
3705 SDValue SelectionDAG::getMemmove(SDValue Chain, DebugLoc dl, SDValue Dst,
3706 SDValue Src, SDValue Size,
3707 unsigned Align, bool isVol,
3708 MachinePointerInfo DstPtrInfo,
3709 MachinePointerInfo SrcPtrInfo) {
3711 // Check to see if we should lower the memmove to loads and stores first.
3712 // For cases within the target-specified limits, this is the best choice.
3713 ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size);
3715 // Memmove with size zero? Just return the original chain.
3716 if (ConstantSize->isNullValue())
3720 getMemmoveLoadsAndStores(*this, dl, Chain, Dst, Src,
3721 ConstantSize->getZExtValue(), Align, isVol,
3722 false, DstPtrInfo, SrcPtrInfo);
3723 if (Result.getNode())
3727 // Then check to see if we should lower the memmove with target-specific
3728 // code. If the target chooses to do this, this is the next best.
3730 TSI.EmitTargetCodeForMemmove(*this, dl, Chain, Dst, Src, Size, Align, isVol,
3731 DstPtrInfo, SrcPtrInfo);
3732 if (Result.getNode())
3735 // FIXME: If the memmove is volatile, lowering it to plain libc memmove may
3736 // not be safe. See memcpy above for more details.
3738 // Emit a library call.
3739 TargetLowering::ArgListTy Args;
3740 TargetLowering::ArgListEntry Entry;
3741 Entry.Ty = TLI.getTargetData()->getIntPtrType(*getContext());
3742 Entry.Node = Dst; Args.push_back(Entry);
3743 Entry.Node = Src; Args.push_back(Entry);
3744 Entry.Node = Size; Args.push_back(Entry);
3745 // FIXME: pass in DebugLoc
3746 std::pair<SDValue,SDValue> CallResult =
3747 TLI.LowerCallTo(Chain, Type::getVoidTy(*getContext()),
3748 false, false, false, false, 0,
3749 TLI.getLibcallCallingConv(RTLIB::MEMMOVE), false,
3750 /*isReturnValueUsed=*/false,
3751 getExternalSymbol(TLI.getLibcallName(RTLIB::MEMMOVE),
3752 TLI.getPointerTy()),
3754 return CallResult.second;
3757 SDValue SelectionDAG::getMemset(SDValue Chain, DebugLoc dl, SDValue Dst,
3758 SDValue Src, SDValue Size,
3759 unsigned Align, bool isVol,
3760 MachinePointerInfo DstPtrInfo) {
3762 // Check to see if we should lower the memset to stores first.
3763 // For cases within the target-specified limits, this is the best choice.
3764 ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size);
3766 // Memset with size zero? Just return the original chain.
3767 if (ConstantSize->isNullValue())
3771 getMemsetStores(*this, dl, Chain, Dst, Src, ConstantSize->getZExtValue(),
3772 Align, isVol, DstPtrInfo);
3774 if (Result.getNode())
3778 // Then check to see if we should lower the memset with target-specific
3779 // code. If the target chooses to do this, this is the next best.
3781 TSI.EmitTargetCodeForMemset(*this, dl, Chain, Dst, Src, Size, Align, isVol,
3783 if (Result.getNode())
3786 // Emit a library call.
3787 const Type *IntPtrTy = TLI.getTargetData()->getIntPtrType(*getContext());
3788 TargetLowering::ArgListTy Args;
3789 TargetLowering::ArgListEntry Entry;
3790 Entry.Node = Dst; Entry.Ty = IntPtrTy;
3791 Args.push_back(Entry);
3792 // Extend or truncate the argument to be an i32 value for the call.
3793 if (Src.getValueType().bitsGT(MVT::i32))
3794 Src = getNode(ISD::TRUNCATE, dl, MVT::i32, Src);
3796 Src = getNode(ISD::ZERO_EXTEND, dl, MVT::i32, Src);
3798 Entry.Ty = Type::getInt32Ty(*getContext());
3799 Entry.isSExt = true;
3800 Args.push_back(Entry);
3802 Entry.Ty = IntPtrTy;
3803 Entry.isSExt = false;
3804 Args.push_back(Entry);
3805 // FIXME: pass in DebugLoc
3806 std::pair<SDValue,SDValue> CallResult =
3807 TLI.LowerCallTo(Chain, Type::getVoidTy(*getContext()),
3808 false, false, false, false, 0,
3809 TLI.getLibcallCallingConv(RTLIB::MEMSET), false,
3810 /*isReturnValueUsed=*/false,
3811 getExternalSymbol(TLI.getLibcallName(RTLIB::MEMSET),
3812 TLI.getPointerTy()),
3814 return CallResult.second;
3817 SDValue SelectionDAG::getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT,
3818 SDValue Chain, SDValue Ptr, SDValue Cmp,
3819 SDValue Swp, MachinePointerInfo PtrInfo,
3820 unsigned Alignment) {
3821 if (Alignment == 0) // Ensure that codegen never sees alignment 0
3822 Alignment = getEVTAlignment(MemVT);
3824 MachineFunction &MF = getMachineFunction();
3825 unsigned Flags = MachineMemOperand::MOLoad | MachineMemOperand::MOStore;
3827 // For now, atomics are considered to be volatile always.
3828 Flags |= MachineMemOperand::MOVolatile;
3830 MachineMemOperand *MMO =
3831 MF.getMachineMemOperand(PtrInfo, Flags, MemVT.getStoreSize(), Alignment);
3833 return getAtomic(Opcode, dl, MemVT, Chain, Ptr, Cmp, Swp, MMO);
3836 SDValue SelectionDAG::getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT,
3838 SDValue Ptr, SDValue Cmp,
3839 SDValue Swp, MachineMemOperand *MMO) {
3840 assert(Opcode == ISD::ATOMIC_CMP_SWAP && "Invalid Atomic Op");
3841 assert(Cmp.getValueType() == Swp.getValueType() && "Invalid Atomic Op Types");
3843 EVT VT = Cmp.getValueType();
3845 SDVTList VTs = getVTList(VT, MVT::Other);
3846 FoldingSetNodeID ID;
3847 ID.AddInteger(MemVT.getRawBits());
3848 SDValue Ops[] = {Chain, Ptr, Cmp, Swp};
3849 AddNodeIDNode(ID, Opcode, VTs, Ops, 4);
3851 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) {
3852 cast<AtomicSDNode>(E)->refineAlignment(MMO);
3853 return SDValue(E, 0);
3855 SDNode *N = new (NodeAllocator) AtomicSDNode(Opcode, dl, VTs, MemVT, Chain,
3856 Ptr, Cmp, Swp, MMO);
3857 CSEMap.InsertNode(N, IP);
3858 AllNodes.push_back(N);
3859 return SDValue(N, 0);
3862 SDValue SelectionDAG::getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT,
3864 SDValue Ptr, SDValue Val,
3865 const Value* PtrVal,
3866 unsigned Alignment) {
3867 if (Alignment == 0) // Ensure that codegen never sees alignment 0
3868 Alignment = getEVTAlignment(MemVT);
3870 MachineFunction &MF = getMachineFunction();
3871 unsigned Flags = MachineMemOperand::MOLoad | MachineMemOperand::MOStore;
3873 // For now, atomics are considered to be volatile always.
3874 Flags |= MachineMemOperand::MOVolatile;
3876 MachineMemOperand *MMO =
3877 MF.getMachineMemOperand(MachinePointerInfo(PtrVal), Flags,
3878 MemVT.getStoreSize(), Alignment);
3880 return getAtomic(Opcode, dl, MemVT, Chain, Ptr, Val, MMO);
3883 SDValue SelectionDAG::getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT,
3885 SDValue Ptr, SDValue Val,
3886 MachineMemOperand *MMO) {
3887 assert((Opcode == ISD::ATOMIC_LOAD_ADD ||
3888 Opcode == ISD::ATOMIC_LOAD_SUB ||
3889 Opcode == ISD::ATOMIC_LOAD_AND ||
3890 Opcode == ISD::ATOMIC_LOAD_OR ||
3891 Opcode == ISD::ATOMIC_LOAD_XOR ||
3892 Opcode == ISD::ATOMIC_LOAD_NAND ||
3893 Opcode == ISD::ATOMIC_LOAD_MIN ||
3894 Opcode == ISD::ATOMIC_LOAD_MAX ||
3895 Opcode == ISD::ATOMIC_LOAD_UMIN ||
3896 Opcode == ISD::ATOMIC_LOAD_UMAX ||
3897 Opcode == ISD::ATOMIC_SWAP) &&
3898 "Invalid Atomic Op");
3900 EVT VT = Val.getValueType();
3902 SDVTList VTs = getVTList(VT, MVT::Other);
3903 FoldingSetNodeID ID;
3904 ID.AddInteger(MemVT.getRawBits());
3905 SDValue Ops[] = {Chain, Ptr, Val};
3906 AddNodeIDNode(ID, Opcode, VTs, Ops, 3);
3908 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) {
3909 cast<AtomicSDNode>(E)->refineAlignment(MMO);
3910 return SDValue(E, 0);
3912 SDNode *N = new (NodeAllocator) AtomicSDNode(Opcode, dl, VTs, MemVT, Chain,
3914 CSEMap.InsertNode(N, IP);
3915 AllNodes.push_back(N);
3916 return SDValue(N, 0);
3919 /// getMergeValues - Create a MERGE_VALUES node from the given operands.
3920 SDValue SelectionDAG::getMergeValues(const SDValue *Ops, unsigned NumOps,
3925 SmallVector<EVT, 4> VTs;
3926 VTs.reserve(NumOps);
3927 for (unsigned i = 0; i < NumOps; ++i)
3928 VTs.push_back(Ops[i].getValueType());
3929 return getNode(ISD::MERGE_VALUES, dl, getVTList(&VTs[0], NumOps),
3934 SelectionDAG::getMemIntrinsicNode(unsigned Opcode, DebugLoc dl,
3935 const EVT *VTs, unsigned NumVTs,
3936 const SDValue *Ops, unsigned NumOps,
3937 EVT MemVT, MachinePointerInfo PtrInfo,
3938 unsigned Align, bool Vol,
3939 bool ReadMem, bool WriteMem) {
3940 return getMemIntrinsicNode(Opcode, dl, makeVTList(VTs, NumVTs), Ops, NumOps,
3941 MemVT, PtrInfo, Align, Vol,
3946 SelectionDAG::getMemIntrinsicNode(unsigned Opcode, DebugLoc dl, SDVTList VTList,
3947 const SDValue *Ops, unsigned NumOps,
3948 EVT MemVT, MachinePointerInfo PtrInfo,
3949 unsigned Align, bool Vol,
3950 bool ReadMem, bool WriteMem) {
3951 if (Align == 0) // Ensure that codegen never sees alignment 0
3952 Align = getEVTAlignment(MemVT);
3954 MachineFunction &MF = getMachineFunction();
3957 Flags |= MachineMemOperand::MOStore;
3959 Flags |= MachineMemOperand::MOLoad;
3961 Flags |= MachineMemOperand::MOVolatile;
3962 MachineMemOperand *MMO =
3963 MF.getMachineMemOperand(PtrInfo, Flags, MemVT.getStoreSize(), Align);
3965 return getMemIntrinsicNode(Opcode, dl, VTList, Ops, NumOps, MemVT, MMO);
3969 SelectionDAG::getMemIntrinsicNode(unsigned Opcode, DebugLoc dl, SDVTList VTList,
3970 const SDValue *Ops, unsigned NumOps,
3971 EVT MemVT, MachineMemOperand *MMO) {
3972 assert((Opcode == ISD::INTRINSIC_VOID ||
3973 Opcode == ISD::INTRINSIC_W_CHAIN ||
3974 Opcode == ISD::PREFETCH ||
3975 (Opcode <= INT_MAX &&
3976 (int)Opcode >= ISD::FIRST_TARGET_MEMORY_OPCODE)) &&
3977 "Opcode is not a memory-accessing opcode!");
3979 // Memoize the node unless it returns a flag.
3980 MemIntrinsicSDNode *N;
3981 if (VTList.VTs[VTList.NumVTs-1] != MVT::Glue) {
3982 FoldingSetNodeID ID;
3983 AddNodeIDNode(ID, Opcode, VTList, Ops, NumOps);
3985 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) {
3986 cast<MemIntrinsicSDNode>(E)->refineAlignment(MMO);
3987 return SDValue(E, 0);
3990 N = new (NodeAllocator) MemIntrinsicSDNode(Opcode, dl, VTList, Ops, NumOps,
3992 CSEMap.InsertNode(N, IP);
3994 N = new (NodeAllocator) MemIntrinsicSDNode(Opcode, dl, VTList, Ops, NumOps,
3997 AllNodes.push_back(N);
3998 return SDValue(N, 0);
4001 /// InferPointerInfo - If the specified ptr/offset is a frame index, infer a
4002 /// MachinePointerInfo record from it. This is particularly useful because the
4003 /// code generator has many cases where it doesn't bother passing in a
4004 /// MachinePointerInfo to getLoad or getStore when it has "FI+Cst".
4005 static MachinePointerInfo InferPointerInfo(SDValue Ptr, int64_t Offset = 0) {
4006 // If this is FI+Offset, we can model it.
4007 if (const FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Ptr))
4008 return MachinePointerInfo::getFixedStack(FI->getIndex(), Offset);
4010 // If this is (FI+Offset1)+Offset2, we can model it.
4011 if (Ptr.getOpcode() != ISD::ADD ||
4012 !isa<ConstantSDNode>(Ptr.getOperand(1)) ||
4013 !isa<FrameIndexSDNode>(Ptr.getOperand(0)))
4014 return MachinePointerInfo();
4016 int FI = cast<FrameIndexSDNode>(Ptr.getOperand(0))->getIndex();
4017 return MachinePointerInfo::getFixedStack(FI, Offset+
4018 cast<ConstantSDNode>(Ptr.getOperand(1))->getSExtValue());
4021 /// InferPointerInfo - If the specified ptr/offset is a frame index, infer a
4022 /// MachinePointerInfo record from it. This is particularly useful because the
4023 /// code generator has many cases where it doesn't bother passing in a
4024 /// MachinePointerInfo to getLoad or getStore when it has "FI+Cst".
4025 static MachinePointerInfo InferPointerInfo(SDValue Ptr, SDValue OffsetOp) {
4026 // If the 'Offset' value isn't a constant, we can't handle this.
4027 if (ConstantSDNode *OffsetNode = dyn_cast<ConstantSDNode>(OffsetOp))
4028 return InferPointerInfo(Ptr, OffsetNode->getSExtValue());
4029 if (OffsetOp.getOpcode() == ISD::UNDEF)
4030 return InferPointerInfo(Ptr);
4031 return MachinePointerInfo();
4036 SelectionDAG::getLoad(ISD::MemIndexedMode AM, ISD::LoadExtType ExtType,
4037 EVT VT, DebugLoc dl, SDValue Chain,
4038 SDValue Ptr, SDValue Offset,
4039 MachinePointerInfo PtrInfo, EVT MemVT,
4040 bool isVolatile, bool isNonTemporal,
4041 unsigned Alignment, const MDNode *TBAAInfo) {
4042 if (Alignment == 0) // Ensure that codegen never sees alignment 0
4043 Alignment = getEVTAlignment(VT);
4045 unsigned Flags = MachineMemOperand::MOLoad;
4047 Flags |= MachineMemOperand::MOVolatile;
4049 Flags |= MachineMemOperand::MONonTemporal;
4051 // If we don't have a PtrInfo, infer the trivial frame index case to simplify
4054 PtrInfo = InferPointerInfo(Ptr, Offset);
4056 MachineFunction &MF = getMachineFunction();
4057 MachineMemOperand *MMO =
4058 MF.getMachineMemOperand(PtrInfo, Flags, MemVT.getStoreSize(), Alignment,
4060 return getLoad(AM, ExtType, VT, dl, Chain, Ptr, Offset, MemVT, MMO);
4064 SelectionDAG::getLoad(ISD::MemIndexedMode AM, ISD::LoadExtType ExtType,
4065 EVT VT, DebugLoc dl, SDValue Chain,
4066 SDValue Ptr, SDValue Offset, EVT MemVT,
4067 MachineMemOperand *MMO) {
4069 ExtType = ISD::NON_EXTLOAD;
4070 } else if (ExtType == ISD::NON_EXTLOAD) {
4071 assert(VT == MemVT && "Non-extending load from different memory type!");
4074 assert(MemVT.getScalarType().bitsLT(VT.getScalarType()) &&
4075 "Should only be an extending load, not truncating!");
4076 assert(VT.isInteger() == MemVT.isInteger() &&
4077 "Cannot convert from FP to Int or Int -> FP!");
4078 assert(VT.isVector() == MemVT.isVector() &&
4079 "Cannot use trunc store to convert to or from a vector!");
4080 assert((!VT.isVector() ||
4081 VT.getVectorNumElements() == MemVT.getVectorNumElements()) &&
4082 "Cannot use trunc store to change the number of vector elements!");
4085 bool Indexed = AM != ISD::UNINDEXED;
4086 assert((Indexed || Offset.getOpcode() == ISD::UNDEF) &&
4087 "Unindexed load with an offset!");
4089 SDVTList VTs = Indexed ?
4090 getVTList(VT, Ptr.getValueType(), MVT::Other) : getVTList(VT, MVT::Other);
4091 SDValue Ops[] = { Chain, Ptr, Offset };
4092 FoldingSetNodeID ID;
4093 AddNodeIDNode(ID, ISD::LOAD, VTs, Ops, 3);
4094 ID.AddInteger(MemVT.getRawBits());
4095 ID.AddInteger(encodeMemSDNodeFlags(ExtType, AM, MMO->isVolatile(),
4096 MMO->isNonTemporal()));
4098 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) {
4099 cast<LoadSDNode>(E)->refineAlignment(MMO);
4100 return SDValue(E, 0);
4102 SDNode *N = new (NodeAllocator) LoadSDNode(Ops, dl, VTs, AM, ExtType,
4104 CSEMap.InsertNode(N, IP);
4105 AllNodes.push_back(N);
4106 return SDValue(N, 0);
4109 SDValue SelectionDAG::getLoad(EVT VT, DebugLoc dl,
4110 SDValue Chain, SDValue Ptr,
4111 MachinePointerInfo PtrInfo,
4112 bool isVolatile, bool isNonTemporal,
4113 unsigned Alignment, const MDNode *TBAAInfo) {
4114 SDValue Undef = getUNDEF(Ptr.getValueType());
4115 return getLoad(ISD::UNINDEXED, ISD::NON_EXTLOAD, VT, dl, Chain, Ptr, Undef,
4116 PtrInfo, VT, isVolatile, isNonTemporal, Alignment, TBAAInfo);
4119 SDValue SelectionDAG::getExtLoad(ISD::LoadExtType ExtType, DebugLoc dl, EVT VT,
4120 SDValue Chain, SDValue Ptr,
4121 MachinePointerInfo PtrInfo, EVT MemVT,
4122 bool isVolatile, bool isNonTemporal,
4123 unsigned Alignment, const MDNode *TBAAInfo) {
4124 SDValue Undef = getUNDEF(Ptr.getValueType());
4125 return getLoad(ISD::UNINDEXED, ExtType, VT, dl, Chain, Ptr, Undef,
4126 PtrInfo, MemVT, isVolatile, isNonTemporal, Alignment,
4132 SelectionDAG::getIndexedLoad(SDValue OrigLoad, DebugLoc dl, SDValue Base,
4133 SDValue Offset, ISD::MemIndexedMode AM) {
4134 LoadSDNode *LD = cast<LoadSDNode>(OrigLoad);
4135 assert(LD->getOffset().getOpcode() == ISD::UNDEF &&
4136 "Load is already a indexed load!");
4137 return getLoad(AM, LD->getExtensionType(), OrigLoad.getValueType(), dl,
4138 LD->getChain(), Base, Offset, LD->getPointerInfo(),
4140 LD->isVolatile(), LD->isNonTemporal(), LD->getAlignment());
4143 SDValue SelectionDAG::getStore(SDValue Chain, DebugLoc dl, SDValue Val,
4144 SDValue Ptr, MachinePointerInfo PtrInfo,
4145 bool isVolatile, bool isNonTemporal,
4146 unsigned Alignment, const MDNode *TBAAInfo) {
4147 if (Alignment == 0) // Ensure that codegen never sees alignment 0
4148 Alignment = getEVTAlignment(Val.getValueType());
4150 unsigned Flags = MachineMemOperand::MOStore;
4152 Flags |= MachineMemOperand::MOVolatile;
4154 Flags |= MachineMemOperand::MONonTemporal;
4157 PtrInfo = InferPointerInfo(Ptr);
4159 MachineFunction &MF = getMachineFunction();
4160 MachineMemOperand *MMO =
4161 MF.getMachineMemOperand(PtrInfo, Flags,
4162 Val.getValueType().getStoreSize(), Alignment,
4165 return getStore(Chain, dl, Val, Ptr, MMO);
4168 SDValue SelectionDAG::getStore(SDValue Chain, DebugLoc dl, SDValue Val,
4169 SDValue Ptr, MachineMemOperand *MMO) {
4170 EVT VT = Val.getValueType();
4171 SDVTList VTs = getVTList(MVT::Other);
4172 SDValue Undef = getUNDEF(Ptr.getValueType());
4173 SDValue Ops[] = { Chain, Val, Ptr, Undef };
4174 FoldingSetNodeID ID;
4175 AddNodeIDNode(ID, ISD::STORE, VTs, Ops, 4);
4176 ID.AddInteger(VT.getRawBits());
4177 ID.AddInteger(encodeMemSDNodeFlags(false, ISD::UNINDEXED, MMO->isVolatile(),
4178 MMO->isNonTemporal()));
4180 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) {
4181 cast<StoreSDNode>(E)->refineAlignment(MMO);
4182 return SDValue(E, 0);
4184 SDNode *N = new (NodeAllocator) StoreSDNode(Ops, dl, VTs, ISD::UNINDEXED,
4186 CSEMap.InsertNode(N, IP);
4187 AllNodes.push_back(N);
4188 return SDValue(N, 0);
4191 SDValue SelectionDAG::getTruncStore(SDValue Chain, DebugLoc dl, SDValue Val,
4192 SDValue Ptr, MachinePointerInfo PtrInfo,
4193 EVT SVT,bool isVolatile, bool isNonTemporal,
4195 const MDNode *TBAAInfo) {
4196 if (Alignment == 0) // Ensure that codegen never sees alignment 0
4197 Alignment = getEVTAlignment(SVT);
4199 unsigned Flags = MachineMemOperand::MOStore;
4201 Flags |= MachineMemOperand::MOVolatile;
4203 Flags |= MachineMemOperand::MONonTemporal;
4206 PtrInfo = InferPointerInfo(Ptr);
4208 MachineFunction &MF = getMachineFunction();
4209 MachineMemOperand *MMO =
4210 MF.getMachineMemOperand(PtrInfo, Flags, SVT.getStoreSize(), Alignment,
4213 return getTruncStore(Chain, dl, Val, Ptr, SVT, MMO);
4216 SDValue SelectionDAG::getTruncStore(SDValue Chain, DebugLoc dl, SDValue Val,
4217 SDValue Ptr, EVT SVT,
4218 MachineMemOperand *MMO) {
4219 EVT VT = Val.getValueType();
4222 return getStore(Chain, dl, Val, Ptr, MMO);
4224 assert(SVT.getScalarType().bitsLT(VT.getScalarType()) &&
4225 "Should only be a truncating store, not extending!");
4226 assert(VT.isInteger() == SVT.isInteger() &&
4227 "Can't do FP-INT conversion!");
4228 assert(VT.isVector() == SVT.isVector() &&
4229 "Cannot use trunc store to convert to or from a vector!");
4230 assert((!VT.isVector() ||
4231 VT.getVectorNumElements() == SVT.getVectorNumElements()) &&
4232 "Cannot use trunc store to change the number of vector elements!");
4234 SDVTList VTs = getVTList(MVT::Other);
4235 SDValue Undef = getUNDEF(Ptr.getValueType());
4236 SDValue Ops[] = { Chain, Val, Ptr, Undef };
4237 FoldingSetNodeID ID;
4238 AddNodeIDNode(ID, ISD::STORE, VTs, Ops, 4);
4239 ID.AddInteger(SVT.getRawBits());
4240 ID.AddInteger(encodeMemSDNodeFlags(true, ISD::UNINDEXED, MMO->isVolatile(),
4241 MMO->isNonTemporal()));
4243 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) {
4244 cast<StoreSDNode>(E)->refineAlignment(MMO);
4245 return SDValue(E, 0);
4247 SDNode *N = new (NodeAllocator) StoreSDNode(Ops, dl, VTs, ISD::UNINDEXED,
4249 CSEMap.InsertNode(N, IP);
4250 AllNodes.push_back(N);
4251 return SDValue(N, 0);
4255 SelectionDAG::getIndexedStore(SDValue OrigStore, DebugLoc dl, SDValue Base,
4256 SDValue Offset, ISD::MemIndexedMode AM) {
4257 StoreSDNode *ST = cast<StoreSDNode>(OrigStore);
4258 assert(ST->getOffset().getOpcode() == ISD::UNDEF &&
4259 "Store is already a indexed store!");
4260 SDVTList VTs = getVTList(Base.getValueType(), MVT::Other);
4261 SDValue Ops[] = { ST->getChain(), ST->getValue(), Base, Offset };
4262 FoldingSetNodeID ID;
4263 AddNodeIDNode(ID, ISD::STORE, VTs, Ops, 4);
4264 ID.AddInteger(ST->getMemoryVT().getRawBits());
4265 ID.AddInteger(ST->getRawSubclassData());
4267 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
4268 return SDValue(E, 0);
4270 SDNode *N = new (NodeAllocator) StoreSDNode(Ops, dl, VTs, AM,
4271 ST->isTruncatingStore(),
4273 ST->getMemOperand());
4274 CSEMap.InsertNode(N, IP);
4275 AllNodes.push_back(N);
4276 return SDValue(N, 0);
4279 SDValue SelectionDAG::getVAArg(EVT VT, DebugLoc dl,
4280 SDValue Chain, SDValue Ptr,
4283 SDValue Ops[] = { Chain, Ptr, SV, getTargetConstant(Align, MVT::i32) };
4284 return getNode(ISD::VAARG, dl, getVTList(VT, MVT::Other), Ops, 4);
4287 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT,
4288 const SDUse *Ops, unsigned NumOps) {
4290 case 0: return getNode(Opcode, DL, VT);
4291 case 1: return getNode(Opcode, DL, VT, Ops[0]);
4292 case 2: return getNode(Opcode, DL, VT, Ops[0], Ops[1]);
4293 case 3: return getNode(Opcode, DL, VT, Ops[0], Ops[1], Ops[2]);
4297 // Copy from an SDUse array into an SDValue array for use with
4298 // the regular getNode logic.
4299 SmallVector<SDValue, 8> NewOps(Ops, Ops + NumOps);
4300 return getNode(Opcode, DL, VT, &NewOps[0], NumOps);
4303 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT,
4304 const SDValue *Ops, unsigned NumOps) {
4306 case 0: return getNode(Opcode, DL, VT);
4307 case 1: return getNode(Opcode, DL, VT, Ops[0]);
4308 case 2: return getNode(Opcode, DL, VT, Ops[0], Ops[1]);
4309 case 3: return getNode(Opcode, DL, VT, Ops[0], Ops[1], Ops[2]);
4315 case ISD::SELECT_CC: {
4316 assert(NumOps == 5 && "SELECT_CC takes 5 operands!");
4317 assert(Ops[0].getValueType() == Ops[1].getValueType() &&
4318 "LHS and RHS of condition must have same type!");
4319 assert(Ops[2].getValueType() == Ops[3].getValueType() &&
4320 "True and False arms of SelectCC must have same type!");
4321 assert(Ops[2].getValueType() == VT &&
4322 "select_cc node must be of same type as true and false value!");
4326 assert(NumOps == 5 && "BR_CC takes 5 operands!");
4327 assert(Ops[2].getValueType() == Ops[3].getValueType() &&
4328 "LHS/RHS of comparison should match types!");
4335 SDVTList VTs = getVTList(VT);
4337 if (VT != MVT::Glue) {
4338 FoldingSetNodeID ID;
4339 AddNodeIDNode(ID, Opcode, VTs, Ops, NumOps);
4342 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
4343 return SDValue(E, 0);
4345 N = new (NodeAllocator) SDNode(Opcode, DL, VTs, Ops, NumOps);
4346 CSEMap.InsertNode(N, IP);
4348 N = new (NodeAllocator) SDNode(Opcode, DL, VTs, Ops, NumOps);
4351 AllNodes.push_back(N);
4355 return SDValue(N, 0);
4358 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL,
4359 const std::vector<EVT> &ResultTys,
4360 const SDValue *Ops, unsigned NumOps) {
4361 return getNode(Opcode, DL, getVTList(&ResultTys[0], ResultTys.size()),
4365 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL,
4366 const EVT *VTs, unsigned NumVTs,
4367 const SDValue *Ops, unsigned NumOps) {
4369 return getNode(Opcode, DL, VTs[0], Ops, NumOps);
4370 return getNode(Opcode, DL, makeVTList(VTs, NumVTs), Ops, NumOps);
4373 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList,
4374 const SDValue *Ops, unsigned NumOps) {
4375 if (VTList.NumVTs == 1)
4376 return getNode(Opcode, DL, VTList.VTs[0], Ops, NumOps);
4380 // FIXME: figure out how to safely handle things like
4381 // int foo(int x) { return 1 << (x & 255); }
4382 // int bar() { return foo(256); }
4383 case ISD::SRA_PARTS:
4384 case ISD::SRL_PARTS:
4385 case ISD::SHL_PARTS:
4386 if (N3.getOpcode() == ISD::SIGN_EXTEND_INREG &&
4387 cast<VTSDNode>(N3.getOperand(1))->getVT() != MVT::i1)
4388 return getNode(Opcode, DL, VT, N1, N2, N3.getOperand(0));
4389 else if (N3.getOpcode() == ISD::AND)
4390 if (ConstantSDNode *AndRHS = dyn_cast<ConstantSDNode>(N3.getOperand(1))) {
4391 // If the and is only masking out bits that cannot effect the shift,
4392 // eliminate the and.
4393 unsigned NumBits = VT.getScalarType().getSizeInBits()*2;
4394 if ((AndRHS->getValue() & (NumBits-1)) == NumBits-1)
4395 return getNode(Opcode, DL, VT, N1, N2, N3.getOperand(0));
4401 // Memoize the node unless it returns a flag.
4403 if (VTList.VTs[VTList.NumVTs-1] != MVT::Glue) {
4404 FoldingSetNodeID ID;
4405 AddNodeIDNode(ID, Opcode, VTList, Ops, NumOps);
4407 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
4408 return SDValue(E, 0);
4411 N = new (NodeAllocator) UnarySDNode(Opcode, DL, VTList, Ops[0]);
4412 } else if (NumOps == 2) {
4413 N = new (NodeAllocator) BinarySDNode(Opcode, DL, VTList, Ops[0], Ops[1]);
4414 } else if (NumOps == 3) {
4415 N = new (NodeAllocator) TernarySDNode(Opcode, DL, VTList, Ops[0], Ops[1],
4418 N = new (NodeAllocator) SDNode(Opcode, DL, VTList, Ops, NumOps);
4420 CSEMap.InsertNode(N, IP);
4423 N = new (NodeAllocator) UnarySDNode(Opcode, DL, VTList, Ops[0]);
4424 } else if (NumOps == 2) {
4425 N = new (NodeAllocator) BinarySDNode(Opcode, DL, VTList, Ops[0], Ops[1]);
4426 } else if (NumOps == 3) {
4427 N = new (NodeAllocator) TernarySDNode(Opcode, DL, VTList, Ops[0], Ops[1],
4430 N = new (NodeAllocator) SDNode(Opcode, DL, VTList, Ops, NumOps);
4433 AllNodes.push_back(N);
4437 return SDValue(N, 0);
4440 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList) {
4441 return getNode(Opcode, DL, VTList, 0, 0);
4444 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList,
4446 SDValue Ops[] = { N1 };
4447 return getNode(Opcode, DL, VTList, Ops, 1);
4450 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList,
4451 SDValue N1, SDValue N2) {
4452 SDValue Ops[] = { N1, N2 };
4453 return getNode(Opcode, DL, VTList, Ops, 2);
4456 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList,
4457 SDValue N1, SDValue N2, SDValue N3) {
4458 SDValue Ops[] = { N1, N2, N3 };
4459 return getNode(Opcode, DL, VTList, Ops, 3);
4462 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList,
4463 SDValue N1, SDValue N2, SDValue N3,
4465 SDValue Ops[] = { N1, N2, N3, N4 };
4466 return getNode(Opcode, DL, VTList, Ops, 4);
4469 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList,
4470 SDValue N1, SDValue N2, SDValue N3,
4471 SDValue N4, SDValue N5) {
4472 SDValue Ops[] = { N1, N2, N3, N4, N5 };
4473 return getNode(Opcode, DL, VTList, Ops, 5);
4476 SDVTList SelectionDAG::getVTList(EVT VT) {
4477 return makeVTList(SDNode::getValueTypeList(VT), 1);
4480 SDVTList SelectionDAG::getVTList(EVT VT1, EVT VT2) {
4481 for (std::vector<SDVTList>::reverse_iterator I = VTList.rbegin(),
4482 E = VTList.rend(); I != E; ++I)
4483 if (I->NumVTs == 2 && I->VTs[0] == VT1 && I->VTs[1] == VT2)
4486 EVT *Array = Allocator.Allocate<EVT>(2);
4489 SDVTList Result = makeVTList(Array, 2);
4490 VTList.push_back(Result);
4494 SDVTList SelectionDAG::getVTList(EVT VT1, EVT VT2, EVT VT3) {
4495 for (std::vector<SDVTList>::reverse_iterator I = VTList.rbegin(),
4496 E = VTList.rend(); I != E; ++I)
4497 if (I->NumVTs == 3 && I->VTs[0] == VT1 && I->VTs[1] == VT2 &&
4501 EVT *Array = Allocator.Allocate<EVT>(3);
4505 SDVTList Result = makeVTList(Array, 3);
4506 VTList.push_back(Result);
4510 SDVTList SelectionDAG::getVTList(EVT VT1, EVT VT2, EVT VT3, EVT VT4) {
4511 for (std::vector<SDVTList>::reverse_iterator I = VTList.rbegin(),
4512 E = VTList.rend(); I != E; ++I)
4513 if (I->NumVTs == 4 && I->VTs[0] == VT1 && I->VTs[1] == VT2 &&
4514 I->VTs[2] == VT3 && I->VTs[3] == VT4)
4517 EVT *Array = Allocator.Allocate<EVT>(4);
4522 SDVTList Result = makeVTList(Array, 4);
4523 VTList.push_back(Result);
4527 SDVTList SelectionDAG::getVTList(const EVT *VTs, unsigned NumVTs) {
4529 case 0: llvm_unreachable("Cannot have nodes without results!");
4530 case 1: return getVTList(VTs[0]);
4531 case 2: return getVTList(VTs[0], VTs[1]);
4532 case 3: return getVTList(VTs[0], VTs[1], VTs[2]);
4533 case 4: return getVTList(VTs[0], VTs[1], VTs[2], VTs[3]);
4537 for (std::vector<SDVTList>::reverse_iterator I = VTList.rbegin(),
4538 E = VTList.rend(); I != E; ++I) {
4539 if (I->NumVTs != NumVTs || VTs[0] != I->VTs[0] || VTs[1] != I->VTs[1])
4542 bool NoMatch = false;
4543 for (unsigned i = 2; i != NumVTs; ++i)
4544 if (VTs[i] != I->VTs[i]) {
4552 EVT *Array = Allocator.Allocate<EVT>(NumVTs);
4553 std::copy(VTs, VTs+NumVTs, Array);
4554 SDVTList Result = makeVTList(Array, NumVTs);
4555 VTList.push_back(Result);
4560 /// UpdateNodeOperands - *Mutate* the specified node in-place to have the
4561 /// specified operands. If the resultant node already exists in the DAG,
4562 /// this does not modify the specified node, instead it returns the node that
4563 /// already exists. If the resultant node does not exist in the DAG, the
4564 /// input node is returned. As a degenerate case, if you specify the same
4565 /// input operands as the node already has, the input node is returned.
4566 SDNode *SelectionDAG::UpdateNodeOperands(SDNode *N, SDValue Op) {
4567 assert(N->getNumOperands() == 1 && "Update with wrong number of operands");
4569 // Check to see if there is no change.
4570 if (Op == N->getOperand(0)) return N;
4572 // See if the modified node already exists.
4573 void *InsertPos = 0;
4574 if (SDNode *Existing = FindModifiedNodeSlot(N, Op, InsertPos))
4577 // Nope it doesn't. Remove the node from its current place in the maps.
4579 if (!RemoveNodeFromCSEMaps(N))
4582 // Now we update the operands.
4583 N->OperandList[0].set(Op);
4585 // If this gets put into a CSE map, add it.
4586 if (InsertPos) CSEMap.InsertNode(N, InsertPos);
4590 SDNode *SelectionDAG::UpdateNodeOperands(SDNode *N, SDValue Op1, SDValue Op2) {
4591 assert(N->getNumOperands() == 2 && "Update with wrong number of operands");
4593 // Check to see if there is no change.
4594 if (Op1 == N->getOperand(0) && Op2 == N->getOperand(1))
4595 return N; // No operands changed, just return the input node.
4597 // See if the modified node already exists.
4598 void *InsertPos = 0;
4599 if (SDNode *Existing = FindModifiedNodeSlot(N, Op1, Op2, InsertPos))
4602 // Nope it doesn't. Remove the node from its current place in the maps.
4604 if (!RemoveNodeFromCSEMaps(N))
4607 // Now we update the operands.
4608 if (N->OperandList[0] != Op1)
4609 N->OperandList[0].set(Op1);
4610 if (N->OperandList[1] != Op2)
4611 N->OperandList[1].set(Op2);
4613 // If this gets put into a CSE map, add it.
4614 if (InsertPos) CSEMap.InsertNode(N, InsertPos);
4618 SDNode *SelectionDAG::
4619 UpdateNodeOperands(SDNode *N, SDValue Op1, SDValue Op2, SDValue Op3) {
4620 SDValue Ops[] = { Op1, Op2, Op3 };
4621 return UpdateNodeOperands(N, Ops, 3);
4624 SDNode *SelectionDAG::
4625 UpdateNodeOperands(SDNode *N, SDValue Op1, SDValue Op2,
4626 SDValue Op3, SDValue Op4) {
4627 SDValue Ops[] = { Op1, Op2, Op3, Op4 };
4628 return UpdateNodeOperands(N, Ops, 4);
4631 SDNode *SelectionDAG::
4632 UpdateNodeOperands(SDNode *N, SDValue Op1, SDValue Op2,
4633 SDValue Op3, SDValue Op4, SDValue Op5) {
4634 SDValue Ops[] = { Op1, Op2, Op3, Op4, Op5 };
4635 return UpdateNodeOperands(N, Ops, 5);
4638 SDNode *SelectionDAG::
4639 UpdateNodeOperands(SDNode *N, const SDValue *Ops, unsigned NumOps) {
4640 assert(N->getNumOperands() == NumOps &&
4641 "Update with wrong number of operands");
4643 // Check to see if there is no change.
4644 bool AnyChange = false;
4645 for (unsigned i = 0; i != NumOps; ++i) {
4646 if (Ops[i] != N->getOperand(i)) {
4652 // No operands changed, just return the input node.
4653 if (!AnyChange) return N;
4655 // See if the modified node already exists.
4656 void *InsertPos = 0;
4657 if (SDNode *Existing = FindModifiedNodeSlot(N, Ops, NumOps, InsertPos))
4660 // Nope it doesn't. Remove the node from its current place in the maps.
4662 if (!RemoveNodeFromCSEMaps(N))
4665 // Now we update the operands.
4666 for (unsigned i = 0; i != NumOps; ++i)
4667 if (N->OperandList[i] != Ops[i])
4668 N->OperandList[i].set(Ops[i]);
4670 // If this gets put into a CSE map, add it.
4671 if (InsertPos) CSEMap.InsertNode(N, InsertPos);
4675 /// DropOperands - Release the operands and set this node to have
4677 void SDNode::DropOperands() {
4678 // Unlike the code in MorphNodeTo that does this, we don't need to
4679 // watch for dead nodes here.
4680 for (op_iterator I = op_begin(), E = op_end(); I != E; ) {
4686 /// SelectNodeTo - These are wrappers around MorphNodeTo that accept a
4689 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4691 SDVTList VTs = getVTList(VT);
4692 return SelectNodeTo(N, MachineOpc, VTs, 0, 0);
4695 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4696 EVT VT, SDValue Op1) {
4697 SDVTList VTs = getVTList(VT);
4698 SDValue Ops[] = { Op1 };
4699 return SelectNodeTo(N, MachineOpc, VTs, Ops, 1);
4702 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4703 EVT VT, SDValue Op1,
4705 SDVTList VTs = getVTList(VT);
4706 SDValue Ops[] = { Op1, Op2 };
4707 return SelectNodeTo(N, MachineOpc, VTs, Ops, 2);
4710 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4711 EVT VT, SDValue Op1,
4712 SDValue Op2, SDValue Op3) {
4713 SDVTList VTs = getVTList(VT);
4714 SDValue Ops[] = { Op1, Op2, Op3 };
4715 return SelectNodeTo(N, MachineOpc, VTs, Ops, 3);
4718 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4719 EVT VT, const SDValue *Ops,
4721 SDVTList VTs = getVTList(VT);
4722 return SelectNodeTo(N, MachineOpc, VTs, Ops, NumOps);
4725 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4726 EVT VT1, EVT VT2, const SDValue *Ops,
4728 SDVTList VTs = getVTList(VT1, VT2);
4729 return SelectNodeTo(N, MachineOpc, VTs, Ops, NumOps);
4732 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4734 SDVTList VTs = getVTList(VT1, VT2);
4735 return SelectNodeTo(N, MachineOpc, VTs, (SDValue *)0, 0);
4738 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4739 EVT VT1, EVT VT2, EVT VT3,
4740 const SDValue *Ops, unsigned NumOps) {
4741 SDVTList VTs = getVTList(VT1, VT2, VT3);
4742 return SelectNodeTo(N, MachineOpc, VTs, Ops, NumOps);
4745 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4746 EVT VT1, EVT VT2, EVT VT3, EVT VT4,
4747 const SDValue *Ops, unsigned NumOps) {
4748 SDVTList VTs = getVTList(VT1, VT2, VT3, VT4);
4749 return SelectNodeTo(N, MachineOpc, VTs, Ops, NumOps);
4752 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4755 SDVTList VTs = getVTList(VT1, VT2);
4756 SDValue Ops[] = { Op1 };
4757 return SelectNodeTo(N, MachineOpc, VTs, Ops, 1);
4760 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4762 SDValue Op1, SDValue Op2) {
4763 SDVTList VTs = getVTList(VT1, VT2);
4764 SDValue Ops[] = { Op1, Op2 };
4765 return SelectNodeTo(N, MachineOpc, VTs, Ops, 2);
4768 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4770 SDValue Op1, SDValue Op2,
4772 SDVTList VTs = getVTList(VT1, VT2);
4773 SDValue Ops[] = { Op1, Op2, Op3 };
4774 return SelectNodeTo(N, MachineOpc, VTs, Ops, 3);
4777 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4778 EVT VT1, EVT VT2, EVT VT3,
4779 SDValue Op1, SDValue Op2,
4781 SDVTList VTs = getVTList(VT1, VT2, VT3);
4782 SDValue Ops[] = { Op1, Op2, Op3 };
4783 return SelectNodeTo(N, MachineOpc, VTs, Ops, 3);
4786 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4787 SDVTList VTs, const SDValue *Ops,
4789 N = MorphNodeTo(N, ~MachineOpc, VTs, Ops, NumOps);
4790 // Reset the NodeID to -1.
4795 /// MorphNodeTo - This *mutates* the specified node to have the specified
4796 /// return type, opcode, and operands.
4798 /// Note that MorphNodeTo returns the resultant node. If there is already a
4799 /// node of the specified opcode and operands, it returns that node instead of
4800 /// the current one. Note that the DebugLoc need not be the same.
4802 /// Using MorphNodeTo is faster than creating a new node and swapping it in
4803 /// with ReplaceAllUsesWith both because it often avoids allocating a new
4804 /// node, and because it doesn't require CSE recalculation for any of
4805 /// the node's users.
4807 SDNode *SelectionDAG::MorphNodeTo(SDNode *N, unsigned Opc,
4808 SDVTList VTs, const SDValue *Ops,
4810 // If an identical node already exists, use it.
4812 if (VTs.VTs[VTs.NumVTs-1] != MVT::Glue) {
4813 FoldingSetNodeID ID;
4814 AddNodeIDNode(ID, Opc, VTs, Ops, NumOps);
4815 if (SDNode *ON = CSEMap.FindNodeOrInsertPos(ID, IP))
4819 if (!RemoveNodeFromCSEMaps(N))
4822 // Start the morphing.
4824 N->ValueList = VTs.VTs;
4825 N->NumValues = VTs.NumVTs;
4827 // Clear the operands list, updating used nodes to remove this from their
4828 // use list. Keep track of any operands that become dead as a result.
4829 SmallPtrSet<SDNode*, 16> DeadNodeSet;
4830 for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ) {
4832 SDNode *Used = Use.getNode();
4834 if (Used->use_empty())
4835 DeadNodeSet.insert(Used);
4838 if (MachineSDNode *MN = dyn_cast<MachineSDNode>(N)) {
4839 // Initialize the memory references information.
4840 MN->setMemRefs(0, 0);
4841 // If NumOps is larger than the # of operands we can have in a
4842 // MachineSDNode, reallocate the operand list.
4843 if (NumOps > MN->NumOperands || !MN->OperandsNeedDelete) {
4844 if (MN->OperandsNeedDelete)
4845 delete[] MN->OperandList;
4846 if (NumOps > array_lengthof(MN->LocalOperands))
4847 // We're creating a final node that will live unmorphed for the
4848 // remainder of the current SelectionDAG iteration, so we can allocate
4849 // the operands directly out of a pool with no recycling metadata.
4850 MN->InitOperands(OperandAllocator.Allocate<SDUse>(NumOps),
4853 MN->InitOperands(MN->LocalOperands, Ops, NumOps);
4854 MN->OperandsNeedDelete = false;
4856 MN->InitOperands(MN->OperandList, Ops, NumOps);
4858 // If NumOps is larger than the # of operands we currently have, reallocate
4859 // the operand list.
4860 if (NumOps > N->NumOperands) {
4861 if (N->OperandsNeedDelete)
4862 delete[] N->OperandList;
4863 N->InitOperands(new SDUse[NumOps], Ops, NumOps);
4864 N->OperandsNeedDelete = true;
4866 N->InitOperands(N->OperandList, Ops, NumOps);
4869 // Delete any nodes that are still dead after adding the uses for the
4871 if (!DeadNodeSet.empty()) {
4872 SmallVector<SDNode *, 16> DeadNodes;
4873 for (SmallPtrSet<SDNode *, 16>::iterator I = DeadNodeSet.begin(),
4874 E = DeadNodeSet.end(); I != E; ++I)
4875 if ((*I)->use_empty())
4876 DeadNodes.push_back(*I);
4877 RemoveDeadNodes(DeadNodes);
4881 CSEMap.InsertNode(N, IP); // Memoize the new node.
4886 /// getMachineNode - These are used for target selectors to create a new node
4887 /// with specified return type(s), MachineInstr opcode, and operands.
4889 /// Note that getMachineNode returns the resultant node. If there is already a
4890 /// node of the specified opcode and operands, it returns that node instead of
4891 /// the current one.
4893 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT) {
4894 SDVTList VTs = getVTList(VT);
4895 return getMachineNode(Opcode, dl, VTs, 0, 0);
4899 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT, SDValue Op1) {
4900 SDVTList VTs = getVTList(VT);
4901 SDValue Ops[] = { Op1 };
4902 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops));
4906 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT,
4907 SDValue Op1, SDValue Op2) {
4908 SDVTList VTs = getVTList(VT);
4909 SDValue Ops[] = { Op1, Op2 };
4910 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops));
4914 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT,
4915 SDValue Op1, SDValue Op2, SDValue Op3) {
4916 SDVTList VTs = getVTList(VT);
4917 SDValue Ops[] = { Op1, Op2, Op3 };
4918 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops));
4922 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT,
4923 const SDValue *Ops, unsigned NumOps) {
4924 SDVTList VTs = getVTList(VT);
4925 return getMachineNode(Opcode, dl, VTs, Ops, NumOps);
4929 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT1, EVT VT2) {
4930 SDVTList VTs = getVTList(VT1, VT2);
4931 return getMachineNode(Opcode, dl, VTs, 0, 0);
4935 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl,
4936 EVT VT1, EVT VT2, SDValue Op1) {
4937 SDVTList VTs = getVTList(VT1, VT2);
4938 SDValue Ops[] = { Op1 };
4939 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops));
4943 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl,
4944 EVT VT1, EVT VT2, SDValue Op1, SDValue Op2) {
4945 SDVTList VTs = getVTList(VT1, VT2);
4946 SDValue Ops[] = { Op1, Op2 };
4947 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops));
4951 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl,
4952 EVT VT1, EVT VT2, SDValue Op1,
4953 SDValue Op2, SDValue Op3) {
4954 SDVTList VTs = getVTList(VT1, VT2);
4955 SDValue Ops[] = { Op1, Op2, Op3 };
4956 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops));
4960 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl,
4962 const SDValue *Ops, unsigned NumOps) {
4963 SDVTList VTs = getVTList(VT1, VT2);
4964 return getMachineNode(Opcode, dl, VTs, Ops, NumOps);
4968 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl,
4969 EVT VT1, EVT VT2, EVT VT3,
4970 SDValue Op1, SDValue Op2) {
4971 SDVTList VTs = getVTList(VT1, VT2, VT3);
4972 SDValue Ops[] = { Op1, Op2 };
4973 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops));
4977 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl,
4978 EVT VT1, EVT VT2, EVT VT3,
4979 SDValue Op1, SDValue Op2, SDValue Op3) {
4980 SDVTList VTs = getVTList(VT1, VT2, VT3);
4981 SDValue Ops[] = { Op1, Op2, Op3 };
4982 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops));
4986 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl,
4987 EVT VT1, EVT VT2, EVT VT3,
4988 const SDValue *Ops, unsigned NumOps) {
4989 SDVTList VTs = getVTList(VT1, VT2, VT3);
4990 return getMachineNode(Opcode, dl, VTs, Ops, NumOps);
4994 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT1,
4995 EVT VT2, EVT VT3, EVT VT4,
4996 const SDValue *Ops, unsigned NumOps) {
4997 SDVTList VTs = getVTList(VT1, VT2, VT3, VT4);
4998 return getMachineNode(Opcode, dl, VTs, Ops, NumOps);
5002 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl,
5003 const std::vector<EVT> &ResultTys,
5004 const SDValue *Ops, unsigned NumOps) {
5005 SDVTList VTs = getVTList(&ResultTys[0], ResultTys.size());
5006 return getMachineNode(Opcode, dl, VTs, Ops, NumOps);
5010 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc DL, SDVTList VTs,
5011 const SDValue *Ops, unsigned NumOps) {
5012 bool DoCSE = VTs.VTs[VTs.NumVTs-1] != MVT::Glue;
5017 FoldingSetNodeID ID;
5018 AddNodeIDNode(ID, ~Opcode, VTs, Ops, NumOps);
5020 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
5021 return cast<MachineSDNode>(E);
5024 // Allocate a new MachineSDNode.
5025 N = new (NodeAllocator) MachineSDNode(~Opcode, DL, VTs);
5027 // Initialize the operands list.
5028 if (NumOps > array_lengthof(N->LocalOperands))
5029 // We're creating a final node that will live unmorphed for the
5030 // remainder of the current SelectionDAG iteration, so we can allocate
5031 // the operands directly out of a pool with no recycling metadata.
5032 N->InitOperands(OperandAllocator.Allocate<SDUse>(NumOps),
5035 N->InitOperands(N->LocalOperands, Ops, NumOps);
5036 N->OperandsNeedDelete = false;
5039 CSEMap.InsertNode(N, IP);
5041 AllNodes.push_back(N);
5043 VerifyMachineNode(N);
5048 /// getTargetExtractSubreg - A convenience function for creating
5049 /// TargetOpcode::EXTRACT_SUBREG nodes.
5051 SelectionDAG::getTargetExtractSubreg(int SRIdx, DebugLoc DL, EVT VT,
5053 SDValue SRIdxVal = getTargetConstant(SRIdx, MVT::i32);
5054 SDNode *Subreg = getMachineNode(TargetOpcode::EXTRACT_SUBREG, DL,
5055 VT, Operand, SRIdxVal);
5056 return SDValue(Subreg, 0);
5059 /// getTargetInsertSubreg - A convenience function for creating
5060 /// TargetOpcode::INSERT_SUBREG nodes.
5062 SelectionDAG::getTargetInsertSubreg(int SRIdx, DebugLoc DL, EVT VT,
5063 SDValue Operand, SDValue Subreg) {
5064 SDValue SRIdxVal = getTargetConstant(SRIdx, MVT::i32);
5065 SDNode *Result = getMachineNode(TargetOpcode::INSERT_SUBREG, DL,
5066 VT, Operand, Subreg, SRIdxVal);
5067 return SDValue(Result, 0);
5070 /// getNodeIfExists - Get the specified node if it's already available, or
5071 /// else return NULL.
5072 SDNode *SelectionDAG::getNodeIfExists(unsigned Opcode, SDVTList VTList,
5073 const SDValue *Ops, unsigned NumOps) {
5074 if (VTList.VTs[VTList.NumVTs-1] != MVT::Glue) {
5075 FoldingSetNodeID ID;
5076 AddNodeIDNode(ID, Opcode, VTList, Ops, NumOps);
5078 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
5084 /// getDbgValue - Creates a SDDbgValue node.
5087 SelectionDAG::getDbgValue(MDNode *MDPtr, SDNode *N, unsigned R, uint64_t Off,
5088 DebugLoc DL, unsigned O) {
5089 return new (Allocator) SDDbgValue(MDPtr, N, R, Off, DL, O);
5093 SelectionDAG::getDbgValue(MDNode *MDPtr, const Value *C, uint64_t Off,
5094 DebugLoc DL, unsigned O) {
5095 return new (Allocator) SDDbgValue(MDPtr, C, Off, DL, O);
5099 SelectionDAG::getDbgValue(MDNode *MDPtr, unsigned FI, uint64_t Off,
5100 DebugLoc DL, unsigned O) {
5101 return new (Allocator) SDDbgValue(MDPtr, FI, Off, DL, O);
5106 /// RAUWUpdateListener - Helper for ReplaceAllUsesWith - When the node
5107 /// pointed to by a use iterator is deleted, increment the use iterator
5108 /// so that it doesn't dangle.
5110 /// This class also manages a "downlink" DAGUpdateListener, to forward
5111 /// messages to ReplaceAllUsesWith's callers.
5113 class RAUWUpdateListener : public SelectionDAG::DAGUpdateListener {
5114 SelectionDAG::DAGUpdateListener *DownLink;
5115 SDNode::use_iterator &UI;
5116 SDNode::use_iterator &UE;
5118 virtual void NodeDeleted(SDNode *N, SDNode *E) {
5119 // Increment the iterator as needed.
5120 while (UI != UE && N == *UI)
5123 // Then forward the message.
5124 if (DownLink) DownLink->NodeDeleted(N, E);
5127 virtual void NodeUpdated(SDNode *N) {
5128 // Just forward the message.
5129 if (DownLink) DownLink->NodeUpdated(N);
5133 RAUWUpdateListener(SelectionDAG::DAGUpdateListener *dl,
5134 SDNode::use_iterator &ui,
5135 SDNode::use_iterator &ue)
5136 : DownLink(dl), UI(ui), UE(ue) {}
5141 /// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead.
5142 /// This can cause recursive merging of nodes in the DAG.
5144 /// This version assumes From has a single result value.
5146 void SelectionDAG::ReplaceAllUsesWith(SDValue FromN, SDValue To,
5147 DAGUpdateListener *UpdateListener) {
5148 SDNode *From = FromN.getNode();
5149 assert(From->getNumValues() == 1 && FromN.getResNo() == 0 &&
5150 "Cannot replace with this method!");
5151 assert(From != To.getNode() && "Cannot replace uses of with self");
5153 // Iterate over all the existing uses of From. New uses will be added
5154 // to the beginning of the use list, which we avoid visiting.
5155 // This specifically avoids visiting uses of From that arise while the
5156 // replacement is happening, because any such uses would be the result
5157 // of CSE: If an existing node looks like From after one of its operands
5158 // is replaced by To, we don't want to replace of all its users with To
5159 // too. See PR3018 for more info.
5160 SDNode::use_iterator UI = From->use_begin(), UE = From->use_end();
5161 RAUWUpdateListener Listener(UpdateListener, UI, UE);
5165 // This node is about to morph, remove its old self from the CSE maps.
5166 RemoveNodeFromCSEMaps(User);
5168 // A user can appear in a use list multiple times, and when this
5169 // happens the uses are usually next to each other in the list.
5170 // To help reduce the number of CSE recomputations, process all
5171 // the uses of this user that we can find this way.
5173 SDUse &Use = UI.getUse();
5176 } while (UI != UE && *UI == User);
5178 // Now that we have modified User, add it back to the CSE maps. If it
5179 // already exists there, recursively merge the results together.
5180 AddModifiedNodeToCSEMaps(User, &Listener);
5184 /// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead.
5185 /// This can cause recursive merging of nodes in the DAG.
5187 /// This version assumes that for each value of From, there is a
5188 /// corresponding value in To in the same position with the same type.
5190 void SelectionDAG::ReplaceAllUsesWith(SDNode *From, SDNode *To,
5191 DAGUpdateListener *UpdateListener) {
5193 for (unsigned i = 0, e = From->getNumValues(); i != e; ++i)
5194 assert((!From->hasAnyUseOfValue(i) ||
5195 From->getValueType(i) == To->getValueType(i)) &&
5196 "Cannot use this version of ReplaceAllUsesWith!");
5199 // Handle the trivial case.
5203 // Iterate over just the existing users of From. See the comments in
5204 // the ReplaceAllUsesWith above.
5205 SDNode::use_iterator UI = From->use_begin(), UE = From->use_end();
5206 RAUWUpdateListener Listener(UpdateListener, UI, UE);
5210 // This node is about to morph, remove its old self from the CSE maps.
5211 RemoveNodeFromCSEMaps(User);
5213 // A user can appear in a use list multiple times, and when this
5214 // happens the uses are usually next to each other in the list.
5215 // To help reduce the number of CSE recomputations, process all
5216 // the uses of this user that we can find this way.
5218 SDUse &Use = UI.getUse();
5221 } while (UI != UE && *UI == User);
5223 // Now that we have modified User, add it back to the CSE maps. If it
5224 // already exists there, recursively merge the results together.
5225 AddModifiedNodeToCSEMaps(User, &Listener);
5229 /// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead.
5230 /// This can cause recursive merging of nodes in the DAG.
5232 /// This version can replace From with any result values. To must match the
5233 /// number and types of values returned by From.
5234 void SelectionDAG::ReplaceAllUsesWith(SDNode *From,
5236 DAGUpdateListener *UpdateListener) {
5237 if (From->getNumValues() == 1) // Handle the simple case efficiently.
5238 return ReplaceAllUsesWith(SDValue(From, 0), To[0], UpdateListener);
5240 // Iterate over just the existing users of From. See the comments in
5241 // the ReplaceAllUsesWith above.
5242 SDNode::use_iterator UI = From->use_begin(), UE = From->use_end();
5243 RAUWUpdateListener Listener(UpdateListener, UI, UE);
5247 // This node is about to morph, remove its old self from the CSE maps.
5248 RemoveNodeFromCSEMaps(User);
5250 // A user can appear in a use list multiple times, and when this
5251 // happens the uses are usually next to each other in the list.
5252 // To help reduce the number of CSE recomputations, process all
5253 // the uses of this user that we can find this way.
5255 SDUse &Use = UI.getUse();
5256 const SDValue &ToOp = To[Use.getResNo()];
5259 } while (UI != UE && *UI == User);
5261 // Now that we have modified User, add it back to the CSE maps. If it
5262 // already exists there, recursively merge the results together.
5263 AddModifiedNodeToCSEMaps(User, &Listener);
5267 /// ReplaceAllUsesOfValueWith - Replace any uses of From with To, leaving
5268 /// uses of other values produced by From.getNode() alone. The Deleted
5269 /// vector is handled the same way as for ReplaceAllUsesWith.
5270 void SelectionDAG::ReplaceAllUsesOfValueWith(SDValue From, SDValue To,
5271 DAGUpdateListener *UpdateListener){
5272 // Handle the really simple, really trivial case efficiently.
5273 if (From == To) return;
5275 // Handle the simple, trivial, case efficiently.
5276 if (From.getNode()->getNumValues() == 1) {
5277 ReplaceAllUsesWith(From, To, UpdateListener);
5281 // Iterate over just the existing users of From. See the comments in
5282 // the ReplaceAllUsesWith above.
5283 SDNode::use_iterator UI = From.getNode()->use_begin(),
5284 UE = From.getNode()->use_end();
5285 RAUWUpdateListener Listener(UpdateListener, UI, UE);
5288 bool UserRemovedFromCSEMaps = false;
5290 // A user can appear in a use list multiple times, and when this
5291 // happens the uses are usually next to each other in the list.
5292 // To help reduce the number of CSE recomputations, process all
5293 // the uses of this user that we can find this way.
5295 SDUse &Use = UI.getUse();
5297 // Skip uses of different values from the same node.
5298 if (Use.getResNo() != From.getResNo()) {
5303 // If this node hasn't been modified yet, it's still in the CSE maps,
5304 // so remove its old self from the CSE maps.
5305 if (!UserRemovedFromCSEMaps) {
5306 RemoveNodeFromCSEMaps(User);
5307 UserRemovedFromCSEMaps = true;
5312 } while (UI != UE && *UI == User);
5314 // We are iterating over all uses of the From node, so if a use
5315 // doesn't use the specific value, no changes are made.
5316 if (!UserRemovedFromCSEMaps)
5319 // Now that we have modified User, add it back to the CSE maps. If it
5320 // already exists there, recursively merge the results together.
5321 AddModifiedNodeToCSEMaps(User, &Listener);
5326 /// UseMemo - This class is used by SelectionDAG::ReplaceAllUsesOfValuesWith
5327 /// to record information about a use.
5334 /// operator< - Sort Memos by User.
5335 bool operator<(const UseMemo &L, const UseMemo &R) {
5336 return (intptr_t)L.User < (intptr_t)R.User;
5340 /// ReplaceAllUsesOfValuesWith - Replace any uses of From with To, leaving
5341 /// uses of other values produced by From.getNode() alone. The same value
5342 /// may appear in both the From and To list. The Deleted vector is
5343 /// handled the same way as for ReplaceAllUsesWith.
5344 void SelectionDAG::ReplaceAllUsesOfValuesWith(const SDValue *From,
5347 DAGUpdateListener *UpdateListener){
5348 // Handle the simple, trivial case efficiently.
5350 return ReplaceAllUsesOfValueWith(*From, *To, UpdateListener);
5352 // Read up all the uses and make records of them. This helps
5353 // processing new uses that are introduced during the
5354 // replacement process.
5355 SmallVector<UseMemo, 4> Uses;
5356 for (unsigned i = 0; i != Num; ++i) {
5357 unsigned FromResNo = From[i].getResNo();
5358 SDNode *FromNode = From[i].getNode();
5359 for (SDNode::use_iterator UI = FromNode->use_begin(),
5360 E = FromNode->use_end(); UI != E; ++UI) {
5361 SDUse &Use = UI.getUse();
5362 if (Use.getResNo() == FromResNo) {
5363 UseMemo Memo = { *UI, i, &Use };
5364 Uses.push_back(Memo);
5369 // Sort the uses, so that all the uses from a given User are together.
5370 std::sort(Uses.begin(), Uses.end());
5372 for (unsigned UseIndex = 0, UseIndexEnd = Uses.size();
5373 UseIndex != UseIndexEnd; ) {
5374 // We know that this user uses some value of From. If it is the right
5375 // value, update it.
5376 SDNode *User = Uses[UseIndex].User;
5378 // This node is about to morph, remove its old self from the CSE maps.
5379 RemoveNodeFromCSEMaps(User);
5381 // The Uses array is sorted, so all the uses for a given User
5382 // are next to each other in the list.
5383 // To help reduce the number of CSE recomputations, process all
5384 // the uses of this user that we can find this way.
5386 unsigned i = Uses[UseIndex].Index;
5387 SDUse &Use = *Uses[UseIndex].Use;
5391 } while (UseIndex != UseIndexEnd && Uses[UseIndex].User == User);
5393 // Now that we have modified User, add it back to the CSE maps. If it
5394 // already exists there, recursively merge the results together.
5395 AddModifiedNodeToCSEMaps(User, UpdateListener);
5399 /// AssignTopologicalOrder - Assign a unique node id for each node in the DAG
5400 /// based on their topological order. It returns the maximum id and a vector
5401 /// of the SDNodes* in assigned order by reference.
5402 unsigned SelectionDAG::AssignTopologicalOrder() {
5404 unsigned DAGSize = 0;
5406 // SortedPos tracks the progress of the algorithm. Nodes before it are
5407 // sorted, nodes after it are unsorted. When the algorithm completes
5408 // it is at the end of the list.
5409 allnodes_iterator SortedPos = allnodes_begin();
5411 // Visit all the nodes. Move nodes with no operands to the front of
5412 // the list immediately. Annotate nodes that do have operands with their
5413 // operand count. Before we do this, the Node Id fields of the nodes
5414 // may contain arbitrary values. After, the Node Id fields for nodes
5415 // before SortedPos will contain the topological sort index, and the
5416 // Node Id fields for nodes At SortedPos and after will contain the
5417 // count of outstanding operands.
5418 for (allnodes_iterator I = allnodes_begin(),E = allnodes_end(); I != E; ) {
5421 unsigned Degree = N->getNumOperands();
5423 // A node with no uses, add it to the result array immediately.
5424 N->setNodeId(DAGSize++);
5425 allnodes_iterator Q = N;
5427 SortedPos = AllNodes.insert(SortedPos, AllNodes.remove(Q));
5428 assert(SortedPos != AllNodes.end() && "Overran node list");
5431 // Temporarily use the Node Id as scratch space for the degree count.
5432 N->setNodeId(Degree);
5436 // Visit all the nodes. As we iterate, moves nodes into sorted order,
5437 // such that by the time the end is reached all nodes will be sorted.
5438 for (allnodes_iterator I = allnodes_begin(),E = allnodes_end(); I != E; ++I) {
5441 // N is in sorted position, so all its uses have one less operand
5442 // that needs to be sorted.
5443 for (SDNode::use_iterator UI = N->use_begin(), UE = N->use_end();
5446 unsigned Degree = P->getNodeId();
5447 assert(Degree != 0 && "Invalid node degree");
5450 // All of P's operands are sorted, so P may sorted now.
5451 P->setNodeId(DAGSize++);
5453 SortedPos = AllNodes.insert(SortedPos, AllNodes.remove(P));
5454 assert(SortedPos != AllNodes.end() && "Overran node list");
5457 // Update P's outstanding operand count.
5458 P->setNodeId(Degree);
5461 if (I == SortedPos) {
5464 dbgs() << "Overran sorted position:\n";
5467 llvm_unreachable(0);
5471 assert(SortedPos == AllNodes.end() &&
5472 "Topological sort incomplete!");
5473 assert(AllNodes.front().getOpcode() == ISD::EntryToken &&
5474 "First node in topological sort is not the entry token!");
5475 assert(AllNodes.front().getNodeId() == 0 &&
5476 "First node in topological sort has non-zero id!");
5477 assert(AllNodes.front().getNumOperands() == 0 &&
5478 "First node in topological sort has operands!");
5479 assert(AllNodes.back().getNodeId() == (int)DAGSize-1 &&
5480 "Last node in topologic sort has unexpected id!");
5481 assert(AllNodes.back().use_empty() &&
5482 "Last node in topologic sort has users!");
5483 assert(DAGSize == allnodes_size() && "Node count mismatch!");
5487 /// AssignOrdering - Assign an order to the SDNode.
5488 void SelectionDAG::AssignOrdering(const SDNode *SD, unsigned Order) {
5489 assert(SD && "Trying to assign an order to a null node!");
5490 Ordering->add(SD, Order);
5493 /// GetOrdering - Get the order for the SDNode.
5494 unsigned SelectionDAG::GetOrdering(const SDNode *SD) const {
5495 assert(SD && "Trying to get the order of a null node!");
5496 return Ordering->getOrder(SD);
5499 /// AddDbgValue - Add a dbg_value SDNode. If SD is non-null that means the
5500 /// value is produced by SD.
5501 void SelectionDAG::AddDbgValue(SDDbgValue *DB, SDNode *SD, bool isParameter) {
5502 DbgInfo->add(DB, SD, isParameter);
5504 SD->setHasDebugValue(true);
5507 /// TransferDbgValues - Transfer SDDbgValues.
5508 void SelectionDAG::TransferDbgValues(SDValue From, SDValue To) {
5509 if (From == To || !From.getNode()->getHasDebugValue())
5511 SDNode *FromNode = From.getNode();
5512 SDNode *ToNode = To.getNode();
5513 SmallVector<SDDbgValue *, 2> &DVs = GetDbgValues(FromNode);
5514 SmallVector<SDDbgValue *, 2> ClonedDVs;
5515 for (SmallVector<SDDbgValue *, 2>::iterator I = DVs.begin(), E = DVs.end();
5517 SDDbgValue *Dbg = *I;
5518 if (Dbg->getKind() == SDDbgValue::SDNODE) {
5519 SDDbgValue *Clone = getDbgValue(Dbg->getMDPtr(), ToNode, To.getResNo(),
5520 Dbg->getOffset(), Dbg->getDebugLoc(),
5522 ClonedDVs.push_back(Clone);
5525 for (SmallVector<SDDbgValue *, 2>::iterator I = ClonedDVs.begin(),
5526 E = ClonedDVs.end(); I != E; ++I)
5527 AddDbgValue(*I, ToNode, false);
5530 //===----------------------------------------------------------------------===//
5532 //===----------------------------------------------------------------------===//
5534 HandleSDNode::~HandleSDNode() {
5538 GlobalAddressSDNode::GlobalAddressSDNode(unsigned Opc, DebugLoc DL,
5539 const GlobalValue *GA,
5540 EVT VT, int64_t o, unsigned char TF)
5541 : SDNode(Opc, DL, getSDVTList(VT)), Offset(o), TargetFlags(TF) {
5545 MemSDNode::MemSDNode(unsigned Opc, DebugLoc dl, SDVTList VTs, EVT memvt,
5546 MachineMemOperand *mmo)
5547 : SDNode(Opc, dl, VTs), MemoryVT(memvt), MMO(mmo) {
5548 SubclassData = encodeMemSDNodeFlags(0, ISD::UNINDEXED, MMO->isVolatile(),
5549 MMO->isNonTemporal());
5550 assert(isVolatile() == MMO->isVolatile() && "Volatile encoding error!");
5551 assert(isNonTemporal() == MMO->isNonTemporal() &&
5552 "Non-temporal encoding error!");
5553 assert(memvt.getStoreSize() == MMO->getSize() && "Size mismatch!");
5556 MemSDNode::MemSDNode(unsigned Opc, DebugLoc dl, SDVTList VTs,
5557 const SDValue *Ops, unsigned NumOps, EVT memvt,
5558 MachineMemOperand *mmo)
5559 : SDNode(Opc, dl, VTs, Ops, NumOps),
5560 MemoryVT(memvt), MMO(mmo) {
5561 SubclassData = encodeMemSDNodeFlags(0, ISD::UNINDEXED, MMO->isVolatile(),
5562 MMO->isNonTemporal());
5563 assert(isVolatile() == MMO->isVolatile() && "Volatile encoding error!");
5564 assert(memvt.getStoreSize() == MMO->getSize() && "Size mismatch!");
5567 /// Profile - Gather unique data for the node.
5569 void SDNode::Profile(FoldingSetNodeID &ID) const {
5570 AddNodeIDNode(ID, this);
5575 std::vector<EVT> VTs;
5578 VTs.reserve(MVT::LAST_VALUETYPE);
5579 for (unsigned i = 0; i < MVT::LAST_VALUETYPE; ++i)
5580 VTs.push_back(MVT((MVT::SimpleValueType)i));
5585 static ManagedStatic<std::set<EVT, EVT::compareRawBits> > EVTs;
5586 static ManagedStatic<EVTArray> SimpleVTArray;
5587 static ManagedStatic<sys::SmartMutex<true> > VTMutex;
5589 /// getValueTypeList - Return a pointer to the specified value type.
5591 const EVT *SDNode::getValueTypeList(EVT VT) {
5592 if (VT.isExtended()) {
5593 sys::SmartScopedLock<true> Lock(*VTMutex);
5594 return &(*EVTs->insert(VT).first);
5596 assert(VT.getSimpleVT() < MVT::LAST_VALUETYPE &&
5597 "Value type out of range!");
5598 return &SimpleVTArray->VTs[VT.getSimpleVT().SimpleTy];
5602 /// hasNUsesOfValue - Return true if there are exactly NUSES uses of the
5603 /// indicated value. This method ignores uses of other values defined by this
5605 bool SDNode::hasNUsesOfValue(unsigned NUses, unsigned Value) const {
5606 assert(Value < getNumValues() && "Bad value!");
5608 // TODO: Only iterate over uses of a given value of the node
5609 for (SDNode::use_iterator UI = use_begin(), E = use_end(); UI != E; ++UI) {
5610 if (UI.getUse().getResNo() == Value) {
5617 // Found exactly the right number of uses?
5622 /// hasAnyUseOfValue - Return true if there are any use of the indicated
5623 /// value. This method ignores uses of other values defined by this operation.
5624 bool SDNode::hasAnyUseOfValue(unsigned Value) const {
5625 assert(Value < getNumValues() && "Bad value!");
5627 for (SDNode::use_iterator UI = use_begin(), E = use_end(); UI != E; ++UI)
5628 if (UI.getUse().getResNo() == Value)
5635 /// isOnlyUserOf - Return true if this node is the only use of N.
5637 bool SDNode::isOnlyUserOf(SDNode *N) const {
5639 for (SDNode::use_iterator I = N->use_begin(), E = N->use_end(); I != E; ++I) {
5650 /// isOperand - Return true if this node is an operand of N.
5652 bool SDValue::isOperandOf(SDNode *N) const {
5653 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i)
5654 if (*this == N->getOperand(i))
5659 bool SDNode::isOperandOf(SDNode *N) const {
5660 for (unsigned i = 0, e = N->NumOperands; i != e; ++i)
5661 if (this == N->OperandList[i].getNode())
5666 /// reachesChainWithoutSideEffects - Return true if this operand (which must
5667 /// be a chain) reaches the specified operand without crossing any
5668 /// side-effecting instructions on any chain path. In practice, this looks
5669 /// through token factors and non-volatile loads. In order to remain efficient,
5670 /// this only looks a couple of nodes in, it does not do an exhaustive search.
5671 bool SDValue::reachesChainWithoutSideEffects(SDValue Dest,
5672 unsigned Depth) const {
5673 if (*this == Dest) return true;
5675 // Don't search too deeply, we just want to be able to see through
5676 // TokenFactor's etc.
5677 if (Depth == 0) return false;
5679 // If this is a token factor, all inputs to the TF happen in parallel. If any
5680 // of the operands of the TF does not reach dest, then we cannot do the xform.
5681 if (getOpcode() == ISD::TokenFactor) {
5682 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
5683 if (!getOperand(i).reachesChainWithoutSideEffects(Dest, Depth-1))
5688 // Loads don't have side effects, look through them.
5689 if (LoadSDNode *Ld = dyn_cast<LoadSDNode>(*this)) {
5690 if (!Ld->isVolatile())
5691 return Ld->getChain().reachesChainWithoutSideEffects(Dest, Depth-1);
5696 /// isPredecessorOf - Return true if this node is a predecessor of N. This node
5697 /// is either an operand of N or it can be reached by traversing up the operands.
5698 /// NOTE: this is an expensive method. Use it carefully.
5699 bool SDNode::isPredecessorOf(SDNode *N) const {
5700 SmallPtrSet<SDNode *, 32> Visited;
5701 SmallVector<SDNode *, 16> Worklist;
5702 Worklist.push_back(N);
5705 N = Worklist.pop_back_val();
5706 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
5707 SDNode *Op = N->getOperand(i).getNode();
5710 if (Visited.insert(Op))
5711 Worklist.push_back(Op);
5713 } while (!Worklist.empty());
5718 uint64_t SDNode::getConstantOperandVal(unsigned Num) const {
5719 assert(Num < NumOperands && "Invalid child # of SDNode!");
5720 return cast<ConstantSDNode>(OperandList[Num])->getZExtValue();
5723 std::string SDNode::getOperationName(const SelectionDAG *G) const {
5724 switch (getOpcode()) {
5726 if (getOpcode() < ISD::BUILTIN_OP_END)
5727 return "<<Unknown DAG Node>>";
5728 if (isMachineOpcode()) {
5730 if (const TargetInstrInfo *TII = G->getTarget().getInstrInfo())
5731 if (getMachineOpcode() < TII->getNumOpcodes())
5732 return TII->get(getMachineOpcode()).getName();
5733 return "<<Unknown Machine Node #" + utostr(getOpcode()) + ">>";
5736 const TargetLowering &TLI = G->getTargetLoweringInfo();
5737 const char *Name = TLI.getTargetNodeName(getOpcode());
5738 if (Name) return Name;
5739 return "<<Unknown Target Node #" + utostr(getOpcode()) + ">>";
5741 return "<<Unknown Node #" + utostr(getOpcode()) + ">>";
5744 case ISD::DELETED_NODE:
5745 return "<<Deleted Node!>>";
5747 case ISD::PREFETCH: return "Prefetch";
5748 case ISD::MEMBARRIER: return "MemBarrier";
5749 case ISD::ATOMIC_CMP_SWAP: return "AtomicCmpSwap";
5750 case ISD::ATOMIC_SWAP: return "AtomicSwap";
5751 case ISD::ATOMIC_LOAD_ADD: return "AtomicLoadAdd";
5752 case ISD::ATOMIC_LOAD_SUB: return "AtomicLoadSub";
5753 case ISD::ATOMIC_LOAD_AND: return "AtomicLoadAnd";
5754 case ISD::ATOMIC_LOAD_OR: return "AtomicLoadOr";
5755 case ISD::ATOMIC_LOAD_XOR: return "AtomicLoadXor";
5756 case ISD::ATOMIC_LOAD_NAND: return "AtomicLoadNand";
5757 case ISD::ATOMIC_LOAD_MIN: return "AtomicLoadMin";
5758 case ISD::ATOMIC_LOAD_MAX: return "AtomicLoadMax";
5759 case ISD::ATOMIC_LOAD_UMIN: return "AtomicLoadUMin";
5760 case ISD::ATOMIC_LOAD_UMAX: return "AtomicLoadUMax";
5761 case ISD::PCMARKER: return "PCMarker";
5762 case ISD::READCYCLECOUNTER: return "ReadCycleCounter";
5763 case ISD::SRCVALUE: return "SrcValue";
5764 case ISD::MDNODE_SDNODE: return "MDNode";
5765 case ISD::EntryToken: return "EntryToken";
5766 case ISD::TokenFactor: return "TokenFactor";
5767 case ISD::AssertSext: return "AssertSext";
5768 case ISD::AssertZext: return "AssertZext";
5770 case ISD::BasicBlock: return "BasicBlock";
5771 case ISD::VALUETYPE: return "ValueType";
5772 case ISD::Register: return "Register";
5774 case ISD::Constant: return "Constant";
5775 case ISD::ConstantFP: return "ConstantFP";
5776 case ISD::GlobalAddress: return "GlobalAddress";
5777 case ISD::GlobalTLSAddress: return "GlobalTLSAddress";
5778 case ISD::FrameIndex: return "FrameIndex";
5779 case ISD::JumpTable: return "JumpTable";
5780 case ISD::GLOBAL_OFFSET_TABLE: return "GLOBAL_OFFSET_TABLE";
5781 case ISD::RETURNADDR: return "RETURNADDR";
5782 case ISD::FRAMEADDR: return "FRAMEADDR";
5783 case ISD::FRAME_TO_ARGS_OFFSET: return "FRAME_TO_ARGS_OFFSET";
5784 case ISD::EXCEPTIONADDR: return "EXCEPTIONADDR";
5785 case ISD::LSDAADDR: return "LSDAADDR";
5786 case ISD::EHSELECTION: return "EHSELECTION";
5787 case ISD::EH_RETURN: return "EH_RETURN";
5788 case ISD::EH_SJLJ_SETJMP: return "EH_SJLJ_SETJMP";
5789 case ISD::EH_SJLJ_LONGJMP: return "EH_SJLJ_LONGJMP";
5790 case ISD::EH_SJLJ_DISPATCHSETUP: return "EH_SJLJ_DISPATCHSETUP";
5791 case ISD::ConstantPool: return "ConstantPool";
5792 case ISD::ExternalSymbol: return "ExternalSymbol";
5793 case ISD::BlockAddress: return "BlockAddress";
5794 case ISD::INTRINSIC_WO_CHAIN:
5795 case ISD::INTRINSIC_VOID:
5796 case ISD::INTRINSIC_W_CHAIN: {
5797 unsigned OpNo = getOpcode() == ISD::INTRINSIC_WO_CHAIN ? 0 : 1;
5798 unsigned IID = cast<ConstantSDNode>(getOperand(OpNo))->getZExtValue();
5799 if (IID < Intrinsic::num_intrinsics)
5800 return Intrinsic::getName((Intrinsic::ID)IID);
5801 else if (const TargetIntrinsicInfo *TII = G->getTarget().getIntrinsicInfo())
5802 return TII->getName(IID);
5803 llvm_unreachable("Invalid intrinsic ID");
5806 case ISD::BUILD_VECTOR: return "BUILD_VECTOR";
5807 case ISD::TargetConstant: return "TargetConstant";
5808 case ISD::TargetConstantFP:return "TargetConstantFP";
5809 case ISD::TargetGlobalAddress: return "TargetGlobalAddress";
5810 case ISD::TargetGlobalTLSAddress: return "TargetGlobalTLSAddress";
5811 case ISD::TargetFrameIndex: return "TargetFrameIndex";
5812 case ISD::TargetJumpTable: return "TargetJumpTable";
5813 case ISD::TargetConstantPool: return "TargetConstantPool";
5814 case ISD::TargetExternalSymbol: return "TargetExternalSymbol";
5815 case ISD::TargetBlockAddress: return "TargetBlockAddress";
5817 case ISD::CopyToReg: return "CopyToReg";
5818 case ISD::CopyFromReg: return "CopyFromReg";
5819 case ISD::UNDEF: return "undef";
5820 case ISD::MERGE_VALUES: return "merge_values";
5821 case ISD::INLINEASM: return "inlineasm";
5822 case ISD::EH_LABEL: return "eh_label";
5823 case ISD::HANDLENODE: return "handlenode";
5826 case ISD::FABS: return "fabs";
5827 case ISD::FNEG: return "fneg";
5828 case ISD::FSQRT: return "fsqrt";
5829 case ISD::FSIN: return "fsin";
5830 case ISD::FCOS: return "fcos";
5831 case ISD::FTRUNC: return "ftrunc";
5832 case ISD::FFLOOR: return "ffloor";
5833 case ISD::FCEIL: return "fceil";
5834 case ISD::FRINT: return "frint";
5835 case ISD::FNEARBYINT: return "fnearbyint";
5836 case ISD::FEXP: return "fexp";
5837 case ISD::FEXP2: return "fexp2";
5838 case ISD::FLOG: return "flog";
5839 case ISD::FLOG2: return "flog2";
5840 case ISD::FLOG10: return "flog10";
5843 case ISD::ADD: return "add";
5844 case ISD::SUB: return "sub";
5845 case ISD::MUL: return "mul";
5846 case ISD::MULHU: return "mulhu";
5847 case ISD::MULHS: return "mulhs";
5848 case ISD::SDIV: return "sdiv";
5849 case ISD::UDIV: return "udiv";
5850 case ISD::SREM: return "srem";
5851 case ISD::UREM: return "urem";
5852 case ISD::SMUL_LOHI: return "smul_lohi";
5853 case ISD::UMUL_LOHI: return "umul_lohi";
5854 case ISD::SDIVREM: return "sdivrem";
5855 case ISD::UDIVREM: return "udivrem";
5856 case ISD::AND: return "and";
5857 case ISD::OR: return "or";
5858 case ISD::XOR: return "xor";
5859 case ISD::SHL: return "shl";
5860 case ISD::SRA: return "sra";
5861 case ISD::SRL: return "srl";
5862 case ISD::ROTL: return "rotl";
5863 case ISD::ROTR: return "rotr";
5864 case ISD::FADD: return "fadd";
5865 case ISD::FSUB: return "fsub";
5866 case ISD::FMUL: return "fmul";
5867 case ISD::FDIV: return "fdiv";
5868 case ISD::FREM: return "frem";
5869 case ISD::FCOPYSIGN: return "fcopysign";
5870 case ISD::FGETSIGN: return "fgetsign";
5871 case ISD::FPOW: return "fpow";
5873 case ISD::FPOWI: return "fpowi";
5874 case ISD::SETCC: return "setcc";
5875 case ISD::VSETCC: return "vsetcc";
5876 case ISD::SELECT: return "select";
5877 case ISD::SELECT_CC: return "select_cc";
5878 case ISD::INSERT_VECTOR_ELT: return "insert_vector_elt";
5879 case ISD::EXTRACT_VECTOR_ELT: return "extract_vector_elt";
5880 case ISD::CONCAT_VECTORS: return "concat_vectors";
5881 case ISD::INSERT_SUBVECTOR: return "insert_subvector";
5882 case ISD::EXTRACT_SUBVECTOR: return "extract_subvector";
5883 case ISD::SCALAR_TO_VECTOR: return "scalar_to_vector";
5884 case ISD::VECTOR_SHUFFLE: return "vector_shuffle";
5885 case ISD::CARRY_FALSE: return "carry_false";
5886 case ISD::ADDC: return "addc";
5887 case ISD::ADDE: return "adde";
5888 case ISD::SADDO: return "saddo";
5889 case ISD::UADDO: return "uaddo";
5890 case ISD::SSUBO: return "ssubo";
5891 case ISD::USUBO: return "usubo";
5892 case ISD::SMULO: return "smulo";
5893 case ISD::UMULO: return "umulo";
5894 case ISD::SUBC: return "subc";
5895 case ISD::SUBE: return "sube";
5896 case ISD::SHL_PARTS: return "shl_parts";
5897 case ISD::SRA_PARTS: return "sra_parts";
5898 case ISD::SRL_PARTS: return "srl_parts";
5900 // Conversion operators.
5901 case ISD::SIGN_EXTEND: return "sign_extend";
5902 case ISD::ZERO_EXTEND: return "zero_extend";
5903 case ISD::ANY_EXTEND: return "any_extend";
5904 case ISD::SIGN_EXTEND_INREG: return "sign_extend_inreg";
5905 case ISD::TRUNCATE: return "truncate";
5906 case ISD::FP_ROUND: return "fp_round";
5907 case ISD::FLT_ROUNDS_: return "flt_rounds";
5908 case ISD::FP_ROUND_INREG: return "fp_round_inreg";
5909 case ISD::FP_EXTEND: return "fp_extend";
5911 case ISD::SINT_TO_FP: return "sint_to_fp";
5912 case ISD::UINT_TO_FP: return "uint_to_fp";
5913 case ISD::FP_TO_SINT: return "fp_to_sint";
5914 case ISD::FP_TO_UINT: return "fp_to_uint";
5915 case ISD::BITCAST: return "bitcast";
5916 case ISD::FP16_TO_FP32: return "fp16_to_fp32";
5917 case ISD::FP32_TO_FP16: return "fp32_to_fp16";
5919 case ISD::CONVERT_RNDSAT: {
5920 switch (cast<CvtRndSatSDNode>(this)->getCvtCode()) {
5921 default: llvm_unreachable("Unknown cvt code!");
5922 case ISD::CVT_FF: return "cvt_ff";
5923 case ISD::CVT_FS: return "cvt_fs";
5924 case ISD::CVT_FU: return "cvt_fu";
5925 case ISD::CVT_SF: return "cvt_sf";
5926 case ISD::CVT_UF: return "cvt_uf";
5927 case ISD::CVT_SS: return "cvt_ss";
5928 case ISD::CVT_SU: return "cvt_su";
5929 case ISD::CVT_US: return "cvt_us";
5930 case ISD::CVT_UU: return "cvt_uu";
5934 // Control flow instructions
5935 case ISD::BR: return "br";
5936 case ISD::BRIND: return "brind";
5937 case ISD::BR_JT: return "br_jt";
5938 case ISD::BRCOND: return "brcond";
5939 case ISD::BR_CC: return "br_cc";
5940 case ISD::CALLSEQ_START: return "callseq_start";
5941 case ISD::CALLSEQ_END: return "callseq_end";
5944 case ISD::LOAD: return "load";
5945 case ISD::STORE: return "store";
5946 case ISD::VAARG: return "vaarg";
5947 case ISD::VACOPY: return "vacopy";
5948 case ISD::VAEND: return "vaend";
5949 case ISD::VASTART: return "vastart";
5950 case ISD::DYNAMIC_STACKALLOC: return "dynamic_stackalloc";
5951 case ISD::EXTRACT_ELEMENT: return "extract_element";
5952 case ISD::BUILD_PAIR: return "build_pair";
5953 case ISD::STACKSAVE: return "stacksave";
5954 case ISD::STACKRESTORE: return "stackrestore";
5955 case ISD::TRAP: return "trap";
5958 case ISD::BSWAP: return "bswap";
5959 case ISD::CTPOP: return "ctpop";
5960 case ISD::CTTZ: return "cttz";
5961 case ISD::CTLZ: return "ctlz";
5964 case ISD::TRAMPOLINE: return "trampoline";
5967 switch (cast<CondCodeSDNode>(this)->get()) {
5968 default: llvm_unreachable("Unknown setcc condition!");
5969 case ISD::SETOEQ: return "setoeq";
5970 case ISD::SETOGT: return "setogt";
5971 case ISD::SETOGE: return "setoge";
5972 case ISD::SETOLT: return "setolt";
5973 case ISD::SETOLE: return "setole";
5974 case ISD::SETONE: return "setone";
5976 case ISD::SETO: return "seto";
5977 case ISD::SETUO: return "setuo";
5978 case ISD::SETUEQ: return "setue";
5979 case ISD::SETUGT: return "setugt";
5980 case ISD::SETUGE: return "setuge";
5981 case ISD::SETULT: return "setult";
5982 case ISD::SETULE: return "setule";
5983 case ISD::SETUNE: return "setune";
5985 case ISD::SETEQ: return "seteq";
5986 case ISD::SETGT: return "setgt";
5987 case ISD::SETGE: return "setge";
5988 case ISD::SETLT: return "setlt";
5989 case ISD::SETLE: return "setle";
5990 case ISD::SETNE: return "setne";
5995 const char *SDNode::getIndexedModeName(ISD::MemIndexedMode AM) {
6004 return "<post-inc>";
6006 return "<post-dec>";
6010 std::string ISD::ArgFlagsTy::getArgFlagsString() {
6011 std::string S = "< ";
6025 if (getByValAlign())
6026 S += "byval-align:" + utostr(getByValAlign()) + " ";
6028 S += "orig-align:" + utostr(getOrigAlign()) + " ";
6030 S += "byval-size:" + utostr(getByValSize()) + " ";
6034 void SDNode::dump() const { dump(0); }
6035 void SDNode::dump(const SelectionDAG *G) const {
6040 void SDNode::print_types(raw_ostream &OS, const SelectionDAG *G) const {
6041 OS << (void*)this << ": ";
6043 for (unsigned i = 0, e = getNumValues(); i != e; ++i) {
6045 if (getValueType(i) == MVT::Other)
6048 OS << getValueType(i).getEVTString();
6050 OS << " = " << getOperationName(G);
6053 void SDNode::print_details(raw_ostream &OS, const SelectionDAG *G) const {
6054 if (const MachineSDNode *MN = dyn_cast<MachineSDNode>(this)) {
6055 if (!MN->memoperands_empty()) {
6058 for (MachineSDNode::mmo_iterator i = MN->memoperands_begin(),
6059 e = MN->memoperands_end(); i != e; ++i) {
6061 if (llvm::next(i) != e)
6066 } else if (const ShuffleVectorSDNode *SVN =
6067 dyn_cast<ShuffleVectorSDNode>(this)) {
6069 for (unsigned i = 0, e = ValueList[0].getVectorNumElements(); i != e; ++i) {
6070 int Idx = SVN->getMaskElt(i);
6078 } else if (const ConstantSDNode *CSDN = dyn_cast<ConstantSDNode>(this)) {
6079 OS << '<' << CSDN->getAPIntValue() << '>';
6080 } else if (const ConstantFPSDNode *CSDN = dyn_cast<ConstantFPSDNode>(this)) {
6081 if (&CSDN->getValueAPF().getSemantics()==&APFloat::IEEEsingle)
6082 OS << '<' << CSDN->getValueAPF().convertToFloat() << '>';
6083 else if (&CSDN->getValueAPF().getSemantics()==&APFloat::IEEEdouble)
6084 OS << '<' << CSDN->getValueAPF().convertToDouble() << '>';
6087 CSDN->getValueAPF().bitcastToAPInt().dump();
6090 } else if (const GlobalAddressSDNode *GADN =
6091 dyn_cast<GlobalAddressSDNode>(this)) {
6092 int64_t offset = GADN->getOffset();
6094 WriteAsOperand(OS, GADN->getGlobal());
6097 OS << " + " << offset;
6099 OS << " " << offset;
6100 if (unsigned int TF = GADN->getTargetFlags())
6101 OS << " [TF=" << TF << ']';
6102 } else if (const FrameIndexSDNode *FIDN = dyn_cast<FrameIndexSDNode>(this)) {
6103 OS << "<" << FIDN->getIndex() << ">";
6104 } else if (const JumpTableSDNode *JTDN = dyn_cast<JumpTableSDNode>(this)) {
6105 OS << "<" << JTDN->getIndex() << ">";
6106 if (unsigned int TF = JTDN->getTargetFlags())
6107 OS << " [TF=" << TF << ']';
6108 } else if (const ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(this)){
6109 int offset = CP->getOffset();
6110 if (CP->isMachineConstantPoolEntry())
6111 OS << "<" << *CP->getMachineCPVal() << ">";
6113 OS << "<" << *CP->getConstVal() << ">";
6115 OS << " + " << offset;
6117 OS << " " << offset;
6118 if (unsigned int TF = CP->getTargetFlags())
6119 OS << " [TF=" << TF << ']';
6120 } else if (const BasicBlockSDNode *BBDN = dyn_cast<BasicBlockSDNode>(this)) {
6122 const Value *LBB = (const Value*)BBDN->getBasicBlock()->getBasicBlock();
6124 OS << LBB->getName() << " ";
6125 OS << (const void*)BBDN->getBasicBlock() << ">";
6126 } else if (const RegisterSDNode *R = dyn_cast<RegisterSDNode>(this)) {
6127 OS << ' ' << PrintReg(R->getReg(), G ? G->getTarget().getRegisterInfo() :0);
6128 } else if (const ExternalSymbolSDNode *ES =
6129 dyn_cast<ExternalSymbolSDNode>(this)) {
6130 OS << "'" << ES->getSymbol() << "'";
6131 if (unsigned int TF = ES->getTargetFlags())
6132 OS << " [TF=" << TF << ']';
6133 } else if (const SrcValueSDNode *M = dyn_cast<SrcValueSDNode>(this)) {
6135 OS << "<" << M->getValue() << ">";
6138 } else if (const MDNodeSDNode *MD = dyn_cast<MDNodeSDNode>(this)) {
6140 OS << "<" << MD->getMD() << ">";
6143 } else if (const VTSDNode *N = dyn_cast<VTSDNode>(this)) {
6144 OS << ":" << N->getVT().getEVTString();
6146 else if (const LoadSDNode *LD = dyn_cast<LoadSDNode>(this)) {
6147 OS << "<" << *LD->getMemOperand();
6150 switch (LD->getExtensionType()) {
6151 default: doExt = false; break;
6152 case ISD::EXTLOAD: OS << ", anyext"; break;
6153 case ISD::SEXTLOAD: OS << ", sext"; break;
6154 case ISD::ZEXTLOAD: OS << ", zext"; break;
6157 OS << " from " << LD->getMemoryVT().getEVTString();
6159 const char *AM = getIndexedModeName(LD->getAddressingMode());
6164 } else if (const StoreSDNode *ST = dyn_cast<StoreSDNode>(this)) {
6165 OS << "<" << *ST->getMemOperand();
6167 if (ST->isTruncatingStore())
6168 OS << ", trunc to " << ST->getMemoryVT().getEVTString();
6170 const char *AM = getIndexedModeName(ST->getAddressingMode());
6175 } else if (const MemSDNode* M = dyn_cast<MemSDNode>(this)) {
6176 OS << "<" << *M->getMemOperand() << ">";
6177 } else if (const BlockAddressSDNode *BA =
6178 dyn_cast<BlockAddressSDNode>(this)) {
6180 WriteAsOperand(OS, BA->getBlockAddress()->getFunction(), false);
6182 WriteAsOperand(OS, BA->getBlockAddress()->getBasicBlock(), false);
6184 if (unsigned int TF = BA->getTargetFlags())
6185 OS << " [TF=" << TF << ']';
6189 if (unsigned Order = G->GetOrdering(this))
6190 OS << " [ORD=" << Order << ']';
6192 if (getNodeId() != -1)
6193 OS << " [ID=" << getNodeId() << ']';
6195 DebugLoc dl = getDebugLoc();
6196 if (G && !dl.isUnknown()) {
6198 Scope(dl.getScope(G->getMachineFunction().getFunction()->getContext()));
6200 // Omit the directory, since it's usually long and uninteresting.
6202 OS << Scope.getFilename();
6205 OS << ':' << dl.getLine();
6206 if (dl.getCol() != 0)
6207 OS << ':' << dl.getCol();
6211 void SDNode::print(raw_ostream &OS, const SelectionDAG *G) const {
6213 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
6214 if (i) OS << ", "; else OS << " ";
6215 OS << (void*)getOperand(i).getNode();
6216 if (unsigned RN = getOperand(i).getResNo())
6219 print_details(OS, G);
6222 static void printrWithDepthHelper(raw_ostream &OS, const SDNode *N,
6223 const SelectionDAG *G, unsigned depth,
6236 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
6237 // Don't follow chain operands.
6238 if (N->getOperand(i).getValueType() == MVT::Other)
6241 printrWithDepthHelper(OS, N->getOperand(i).getNode(), G, depth-1, indent+2);
6245 void SDNode::printrWithDepth(raw_ostream &OS, const SelectionDAG *G,
6246 unsigned depth) const {
6247 printrWithDepthHelper(OS, this, G, depth, 0);
6250 void SDNode::printrFull(raw_ostream &OS, const SelectionDAG *G) const {
6251 // Don't print impossibly deep things.
6252 printrWithDepth(OS, G, 10);
6255 void SDNode::dumprWithDepth(const SelectionDAG *G, unsigned depth) const {
6256 printrWithDepth(dbgs(), G, depth);
6259 void SDNode::dumprFull(const SelectionDAG *G) const {
6260 // Don't print impossibly deep things.
6261 dumprWithDepth(G, 10);
6264 static void DumpNodes(const SDNode *N, unsigned indent, const SelectionDAG *G) {
6265 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i)
6266 if (N->getOperand(i).getNode()->hasOneUse())
6267 DumpNodes(N->getOperand(i).getNode(), indent+2, G);
6269 dbgs() << "\n" << std::string(indent+2, ' ')
6270 << (void*)N->getOperand(i).getNode() << ": <multiple use>";
6274 dbgs().indent(indent);
6278 SDValue SelectionDAG::UnrollVectorOp(SDNode *N, unsigned ResNE) {
6279 assert(N->getNumValues() == 1 &&
6280 "Can't unroll a vector with multiple results!");
6282 EVT VT = N->getValueType(0);
6283 unsigned NE = VT.getVectorNumElements();
6284 EVT EltVT = VT.getVectorElementType();
6285 DebugLoc dl = N->getDebugLoc();
6287 SmallVector<SDValue, 8> Scalars;
6288 SmallVector<SDValue, 4> Operands(N->getNumOperands());
6290 // If ResNE is 0, fully unroll the vector op.
6293 else if (NE > ResNE)
6297 for (i= 0; i != NE; ++i) {
6298 for (unsigned j = 0, e = N->getNumOperands(); j != e; ++j) {
6299 SDValue Operand = N->getOperand(j);
6300 EVT OperandVT = Operand.getValueType();
6301 if (OperandVT.isVector()) {
6302 // A vector operand; extract a single element.
6303 EVT OperandEltVT = OperandVT.getVectorElementType();
6304 Operands[j] = getNode(ISD::EXTRACT_VECTOR_ELT, dl,
6307 getConstant(i, TLI.getPointerTy()));
6309 // A scalar operand; just use it as is.
6310 Operands[j] = Operand;
6314 switch (N->getOpcode()) {
6316 Scalars.push_back(getNode(N->getOpcode(), dl, EltVT,
6317 &Operands[0], Operands.size()));
6324 Scalars.push_back(getNode(N->getOpcode(), dl, EltVT, Operands[0],
6325 getShiftAmountOperand(Operands[0].getValueType(),
6328 case ISD::SIGN_EXTEND_INREG:
6329 case ISD::FP_ROUND_INREG: {
6330 EVT ExtVT = cast<VTSDNode>(Operands[1])->getVT().getVectorElementType();
6331 Scalars.push_back(getNode(N->getOpcode(), dl, EltVT,
6333 getValueType(ExtVT)));
6338 for (; i < ResNE; ++i)
6339 Scalars.push_back(getUNDEF(EltVT));
6341 return getNode(ISD::BUILD_VECTOR, dl,
6342 EVT::getVectorVT(*getContext(), EltVT, ResNE),
6343 &Scalars[0], Scalars.size());
6347 /// isConsecutiveLoad - Return true if LD is loading 'Bytes' bytes from a
6348 /// location that is 'Dist' units away from the location that the 'Base' load
6349 /// is loading from.
6350 bool SelectionDAG::isConsecutiveLoad(LoadSDNode *LD, LoadSDNode *Base,
6351 unsigned Bytes, int Dist) const {
6352 if (LD->getChain() != Base->getChain())
6354 EVT VT = LD->getValueType(0);
6355 if (VT.getSizeInBits() / 8 != Bytes)
6358 SDValue Loc = LD->getOperand(1);
6359 SDValue BaseLoc = Base->getOperand(1);
6360 if (Loc.getOpcode() == ISD::FrameIndex) {
6361 if (BaseLoc.getOpcode() != ISD::FrameIndex)
6363 const MachineFrameInfo *MFI = getMachineFunction().getFrameInfo();
6364 int FI = cast<FrameIndexSDNode>(Loc)->getIndex();
6365 int BFI = cast<FrameIndexSDNode>(BaseLoc)->getIndex();
6366 int FS = MFI->getObjectSize(FI);
6367 int BFS = MFI->getObjectSize(BFI);
6368 if (FS != BFS || FS != (int)Bytes) return false;
6369 return MFI->getObjectOffset(FI) == (MFI->getObjectOffset(BFI) + Dist*Bytes);
6373 if (isBaseWithConstantOffset(Loc) && Loc.getOperand(0) == BaseLoc &&
6374 cast<ConstantSDNode>(Loc.getOperand(1))->getSExtValue() == Dist*Bytes)
6377 const GlobalValue *GV1 = NULL;
6378 const GlobalValue *GV2 = NULL;
6379 int64_t Offset1 = 0;
6380 int64_t Offset2 = 0;
6381 bool isGA1 = TLI.isGAPlusOffset(Loc.getNode(), GV1, Offset1);
6382 bool isGA2 = TLI.isGAPlusOffset(BaseLoc.getNode(), GV2, Offset2);
6383 if (isGA1 && isGA2 && GV1 == GV2)
6384 return Offset1 == (Offset2 + Dist*Bytes);
6389 /// InferPtrAlignment - Infer alignment of a load / store address. Return 0 if
6390 /// it cannot be inferred.
6391 unsigned SelectionDAG::InferPtrAlignment(SDValue Ptr) const {
6392 // If this is a GlobalAddress + cst, return the alignment.
6393 const GlobalValue *GV;
6394 int64_t GVOffset = 0;
6395 if (TLI.isGAPlusOffset(Ptr.getNode(), GV, GVOffset)) {
6396 // If GV has specified alignment, then use it. Otherwise, use the preferred
6398 unsigned Align = GV->getAlignment();
6400 if (const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV)) {
6401 if (GVar->hasInitializer()) {
6402 const TargetData *TD = TLI.getTargetData();
6403 Align = TD->getPreferredAlignment(GVar);
6407 return MinAlign(Align, GVOffset);
6410 // If this is a direct reference to a stack slot, use information about the
6411 // stack slot's alignment.
6412 int FrameIdx = 1 << 31;
6413 int64_t FrameOffset = 0;
6414 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Ptr)) {
6415 FrameIdx = FI->getIndex();
6416 } else if (isBaseWithConstantOffset(Ptr) &&
6417 isa<FrameIndexSDNode>(Ptr.getOperand(0))) {
6419 FrameIdx = cast<FrameIndexSDNode>(Ptr.getOperand(0))->getIndex();
6420 FrameOffset = Ptr.getConstantOperandVal(1);
6423 if (FrameIdx != (1 << 31)) {
6424 const MachineFrameInfo &MFI = *getMachineFunction().getFrameInfo();
6425 unsigned FIInfoAlign = MinAlign(MFI.getObjectAlignment(FrameIdx),
6433 void SelectionDAG::dump() const {
6434 dbgs() << "SelectionDAG has " << AllNodes.size() << " nodes:";
6436 for (allnodes_const_iterator I = allnodes_begin(), E = allnodes_end();
6438 const SDNode *N = I;
6439 if (!N->hasOneUse() && N != getRoot().getNode())
6440 DumpNodes(N, 2, this);
6443 if (getRoot().getNode()) DumpNodes(getRoot().getNode(), 2, this);
6448 void SDNode::printr(raw_ostream &OS, const SelectionDAG *G) const {
6450 print_details(OS, G);
6453 typedef SmallPtrSet<const SDNode *, 128> VisitedSDNodeSet;
6454 static void DumpNodesr(raw_ostream &OS, const SDNode *N, unsigned indent,
6455 const SelectionDAG *G, VisitedSDNodeSet &once) {
6456 if (!once.insert(N)) // If we've been here before, return now.
6459 // Dump the current SDNode, but don't end the line yet.
6460 OS << std::string(indent, ' ');
6463 // Having printed this SDNode, walk the children:
6464 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
6465 const SDNode *child = N->getOperand(i).getNode();
6470 if (child->getNumOperands() == 0) {
6471 // This child has no grandchildren; print it inline right here.
6472 child->printr(OS, G);
6474 } else { // Just the address. FIXME: also print the child's opcode.
6476 if (unsigned RN = N->getOperand(i).getResNo())
6483 // Dump children that have grandchildren on their own line(s).
6484 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
6485 const SDNode *child = N->getOperand(i).getNode();
6486 DumpNodesr(OS, child, indent+2, G, once);
6490 void SDNode::dumpr() const {
6491 VisitedSDNodeSet once;
6492 DumpNodesr(dbgs(), this, 0, 0, once);
6495 void SDNode::dumpr(const SelectionDAG *G) const {
6496 VisitedSDNodeSet once;
6497 DumpNodesr(dbgs(), this, 0, G, once);
6501 // getAddressSpace - Return the address space this GlobalAddress belongs to.
6502 unsigned GlobalAddressSDNode::getAddressSpace() const {
6503 return getGlobal()->getType()->getAddressSpace();
6507 const Type *ConstantPoolSDNode::getType() const {
6508 if (isMachineConstantPoolEntry())
6509 return Val.MachineCPVal->getType();
6510 return Val.ConstVal->getType();
6513 bool BuildVectorSDNode::isConstantSplat(APInt &SplatValue,
6515 unsigned &SplatBitSize,
6517 unsigned MinSplatBits,
6519 EVT VT = getValueType(0);
6520 assert(VT.isVector() && "Expected a vector type");
6521 unsigned sz = VT.getSizeInBits();
6522 if (MinSplatBits > sz)
6525 SplatValue = APInt(sz, 0);
6526 SplatUndef = APInt(sz, 0);
6528 // Get the bits. Bits with undefined values (when the corresponding element
6529 // of the vector is an ISD::UNDEF value) are set in SplatUndef and cleared
6530 // in SplatValue. If any of the values are not constant, give up and return
6532 unsigned int nOps = getNumOperands();
6533 assert(nOps > 0 && "isConstantSplat has 0-size build vector");
6534 unsigned EltBitSize = VT.getVectorElementType().getSizeInBits();
6536 for (unsigned j = 0; j < nOps; ++j) {
6537 unsigned i = isBigEndian ? nOps-1-j : j;
6538 SDValue OpVal = getOperand(i);
6539 unsigned BitPos = j * EltBitSize;
6541 if (OpVal.getOpcode() == ISD::UNDEF)
6542 SplatUndef |= APInt::getBitsSet(sz, BitPos, BitPos + EltBitSize);
6543 else if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(OpVal))
6544 SplatValue |= CN->getAPIntValue().zextOrTrunc(EltBitSize).
6545 zextOrTrunc(sz) << BitPos;
6546 else if (ConstantFPSDNode *CN = dyn_cast<ConstantFPSDNode>(OpVal))
6547 SplatValue |= CN->getValueAPF().bitcastToAPInt().zextOrTrunc(sz) <<BitPos;
6552 // The build_vector is all constants or undefs. Find the smallest element
6553 // size that splats the vector.
6555 HasAnyUndefs = (SplatUndef != 0);
6558 unsigned HalfSize = sz / 2;
6559 APInt HighValue = SplatValue.lshr(HalfSize).trunc(HalfSize);
6560 APInt LowValue = SplatValue.trunc(HalfSize);
6561 APInt HighUndef = SplatUndef.lshr(HalfSize).trunc(HalfSize);
6562 APInt LowUndef = SplatUndef.trunc(HalfSize);
6564 // If the two halves do not match (ignoring undef bits), stop here.
6565 if ((HighValue & ~LowUndef) != (LowValue & ~HighUndef) ||
6566 MinSplatBits > HalfSize)
6569 SplatValue = HighValue | LowValue;
6570 SplatUndef = HighUndef & LowUndef;
6579 bool ShuffleVectorSDNode::isSplatMask(const int *Mask, EVT VT) {
6580 // Find the first non-undef value in the shuffle mask.
6582 for (i = 0, e = VT.getVectorNumElements(); i != e && Mask[i] < 0; ++i)
6585 assert(i != e && "VECTOR_SHUFFLE node with all undef indices!");
6587 // Make sure all remaining elements are either undef or the same as the first
6589 for (int Idx = Mask[i]; i != e; ++i)
6590 if (Mask[i] >= 0 && Mask[i] != Idx)
6596 static void checkForCyclesHelper(const SDNode *N,
6597 SmallPtrSet<const SDNode*, 32> &Visited,
6598 SmallPtrSet<const SDNode*, 32> &Checked) {
6599 // If this node has already been checked, don't check it again.
6600 if (Checked.count(N))
6603 // If a node has already been visited on this depth-first walk, reject it as
6605 if (!Visited.insert(N)) {
6606 dbgs() << "Offending node:\n";
6608 errs() << "Detected cycle in SelectionDAG\n";
6612 for(unsigned i = 0, e = N->getNumOperands(); i != e; ++i)
6613 checkForCyclesHelper(N->getOperand(i).getNode(), Visited, Checked);
6620 void llvm::checkForCycles(const llvm::SDNode *N) {
6622 assert(N && "Checking nonexistant SDNode");
6623 SmallPtrSet<const SDNode*, 32> visited;
6624 SmallPtrSet<const SDNode*, 32> checked;
6625 checkForCyclesHelper(N, visited, checked);
6629 void llvm::checkForCycles(const llvm::SelectionDAG *DAG) {
6630 checkForCycles(DAG->getRoot().getNode());