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/ValueTracking.h"
19 #include "llvm/Function.h"
20 #include "llvm/GlobalAlias.h"
21 #include "llvm/GlobalVariable.h"
22 #include "llvm/Intrinsics.h"
23 #include "llvm/DerivedTypes.h"
24 #include "llvm/Assembly/Writer.h"
25 #include "llvm/CallingConv.h"
26 #include "llvm/CodeGen/MachineBasicBlock.h"
27 #include "llvm/CodeGen/MachineConstantPool.h"
28 #include "llvm/CodeGen/MachineFrameInfo.h"
29 #include "llvm/CodeGen/MachineModuleInfo.h"
30 #include "llvm/CodeGen/PseudoSourceValue.h"
31 #include "llvm/Target/TargetRegisterInfo.h"
32 #include "llvm/Target/TargetData.h"
33 #include "llvm/Target/TargetFrameInfo.h"
34 #include "llvm/Target/TargetLowering.h"
35 #include "llvm/Target/TargetOptions.h"
36 #include "llvm/Target/TargetInstrInfo.h"
37 #include "llvm/Target/TargetIntrinsicInfo.h"
38 #include "llvm/Target/TargetMachine.h"
39 #include "llvm/Support/CommandLine.h"
40 #include "llvm/Support/Debug.h"
41 #include "llvm/Support/ErrorHandling.h"
42 #include "llvm/Support/ManagedStatic.h"
43 #include "llvm/Support/MathExtras.h"
44 #include "llvm/Support/raw_ostream.h"
45 #include "llvm/System/Mutex.h"
46 #include "llvm/ADT/SetVector.h"
47 #include "llvm/ADT/SmallPtrSet.h"
48 #include "llvm/ADT/SmallSet.h"
49 #include "llvm/ADT/SmallVector.h"
50 #include "llvm/ADT/StringExtras.h"
55 /// makeVTList - Return an instance of the SDVTList struct initialized with the
56 /// specified members.
57 static SDVTList makeVTList(const EVT *VTs, unsigned NumVTs) {
58 SDVTList Res = {VTs, NumVTs};
62 static const fltSemantics *EVTToAPFloatSemantics(EVT VT) {
63 switch (VT.getSimpleVT().SimpleTy) {
64 default: llvm_unreachable("Unknown FP format");
65 case MVT::f32: return &APFloat::IEEEsingle;
66 case MVT::f64: return &APFloat::IEEEdouble;
67 case MVT::f80: return &APFloat::x87DoubleExtended;
68 case MVT::f128: return &APFloat::IEEEquad;
69 case MVT::ppcf128: return &APFloat::PPCDoubleDouble;
73 SelectionDAG::DAGUpdateListener::~DAGUpdateListener() {}
75 //===----------------------------------------------------------------------===//
76 // ConstantFPSDNode Class
77 //===----------------------------------------------------------------------===//
79 /// isExactlyValue - We don't rely on operator== working on double values, as
80 /// it returns true for things that are clearly not equal, like -0.0 and 0.0.
81 /// As such, this method can be used to do an exact bit-for-bit comparison of
82 /// two floating point values.
83 bool ConstantFPSDNode::isExactlyValue(const APFloat& V) const {
84 return getValueAPF().bitwiseIsEqual(V);
87 bool ConstantFPSDNode::isValueValidForType(EVT VT,
89 assert(VT.isFloatingPoint() && "Can only convert between FP types");
91 // PPC long double cannot be converted to any other type.
92 if (VT == MVT::ppcf128 ||
93 &Val.getSemantics() == &APFloat::PPCDoubleDouble)
96 // convert modifies in place, so make a copy.
97 APFloat Val2 = APFloat(Val);
99 (void) Val2.convert(*EVTToAPFloatSemantics(VT), APFloat::rmNearestTiesToEven,
104 //===----------------------------------------------------------------------===//
106 //===----------------------------------------------------------------------===//
108 /// isBuildVectorAllOnes - Return true if the specified node is a
109 /// BUILD_VECTOR where all of the elements are ~0 or undef.
110 bool ISD::isBuildVectorAllOnes(const SDNode *N) {
111 // Look through a bit convert.
112 if (N->getOpcode() == ISD::BIT_CONVERT)
113 N = N->getOperand(0).getNode();
115 if (N->getOpcode() != ISD::BUILD_VECTOR) return false;
117 unsigned i = 0, e = N->getNumOperands();
119 // Skip over all of the undef values.
120 while (i != e && N->getOperand(i).getOpcode() == ISD::UNDEF)
123 // Do not accept an all-undef vector.
124 if (i == e) return false;
126 // Do not accept build_vectors that aren't all constants or which have non-~0
128 SDValue NotZero = N->getOperand(i);
129 if (isa<ConstantSDNode>(NotZero)) {
130 if (!cast<ConstantSDNode>(NotZero)->isAllOnesValue())
132 } else if (isa<ConstantFPSDNode>(NotZero)) {
133 if (!cast<ConstantFPSDNode>(NotZero)->getValueAPF().
134 bitcastToAPInt().isAllOnesValue())
139 // Okay, we have at least one ~0 value, check to see if the rest match or are
141 for (++i; i != e; ++i)
142 if (N->getOperand(i) != NotZero &&
143 N->getOperand(i).getOpcode() != ISD::UNDEF)
149 /// isBuildVectorAllZeros - Return true if the specified node is a
150 /// BUILD_VECTOR where all of the elements are 0 or undef.
151 bool ISD::isBuildVectorAllZeros(const SDNode *N) {
152 // Look through a bit convert.
153 if (N->getOpcode() == ISD::BIT_CONVERT)
154 N = N->getOperand(0).getNode();
156 if (N->getOpcode() != ISD::BUILD_VECTOR) return false;
158 unsigned i = 0, e = N->getNumOperands();
160 // Skip over all of the undef values.
161 while (i != e && N->getOperand(i).getOpcode() == ISD::UNDEF)
164 // Do not accept an all-undef vector.
165 if (i == e) return false;
167 // Do not accept build_vectors that aren't all constants or which have non-0
169 SDValue Zero = N->getOperand(i);
170 if (isa<ConstantSDNode>(Zero)) {
171 if (!cast<ConstantSDNode>(Zero)->isNullValue())
173 } else if (isa<ConstantFPSDNode>(Zero)) {
174 if (!cast<ConstantFPSDNode>(Zero)->getValueAPF().isPosZero())
179 // Okay, we have at least one 0 value, check to see if the rest match or are
181 for (++i; i != e; ++i)
182 if (N->getOperand(i) != Zero &&
183 N->getOperand(i).getOpcode() != ISD::UNDEF)
188 /// isScalarToVector - Return true if the specified node is a
189 /// ISD::SCALAR_TO_VECTOR node or a BUILD_VECTOR node where only the low
190 /// element is not an undef.
191 bool ISD::isScalarToVector(const SDNode *N) {
192 if (N->getOpcode() == ISD::SCALAR_TO_VECTOR)
195 if (N->getOpcode() != ISD::BUILD_VECTOR)
197 if (N->getOperand(0).getOpcode() == ISD::UNDEF)
199 unsigned NumElems = N->getNumOperands();
200 for (unsigned i = 1; i < NumElems; ++i) {
201 SDValue V = N->getOperand(i);
202 if (V.getOpcode() != ISD::UNDEF)
208 /// getSetCCSwappedOperands - Return the operation corresponding to (Y op X)
209 /// when given the operation for (X op Y).
210 ISD::CondCode ISD::getSetCCSwappedOperands(ISD::CondCode Operation) {
211 // To perform this operation, we just need to swap the L and G bits of the
213 unsigned OldL = (Operation >> 2) & 1;
214 unsigned OldG = (Operation >> 1) & 1;
215 return ISD::CondCode((Operation & ~6) | // Keep the N, U, E bits
216 (OldL << 1) | // New G bit
217 (OldG << 2)); // New L bit.
220 /// getSetCCInverse - Return the operation corresponding to !(X op Y), where
221 /// 'op' is a valid SetCC operation.
222 ISD::CondCode ISD::getSetCCInverse(ISD::CondCode Op, bool isInteger) {
223 unsigned Operation = Op;
225 Operation ^= 7; // Flip L, G, E bits, but not U.
227 Operation ^= 15; // Flip all of the condition bits.
229 if (Operation > ISD::SETTRUE2)
230 Operation &= ~8; // Don't let N and U bits get set.
232 return ISD::CondCode(Operation);
236 /// isSignedOp - For an integer comparison, return 1 if the comparison is a
237 /// signed operation and 2 if the result is an unsigned comparison. Return zero
238 /// if the operation does not depend on the sign of the input (setne and seteq).
239 static int isSignedOp(ISD::CondCode Opcode) {
241 default: llvm_unreachable("Illegal integer setcc operation!");
243 case ISD::SETNE: return 0;
247 case ISD::SETGE: return 1;
251 case ISD::SETUGE: return 2;
255 /// getSetCCOrOperation - Return the result of a logical OR between different
256 /// comparisons of identical values: ((X op1 Y) | (X op2 Y)). This function
257 /// returns SETCC_INVALID if it is not possible to represent the resultant
259 ISD::CondCode ISD::getSetCCOrOperation(ISD::CondCode Op1, ISD::CondCode Op2,
261 if (isInteger && (isSignedOp(Op1) | isSignedOp(Op2)) == 3)
262 // Cannot fold a signed integer setcc with an unsigned integer setcc.
263 return ISD::SETCC_INVALID;
265 unsigned Op = Op1 | Op2; // Combine all of the condition bits.
267 // If the N and U bits get set then the resultant comparison DOES suddenly
268 // care about orderedness, and is true when ordered.
269 if (Op > ISD::SETTRUE2)
270 Op &= ~16; // Clear the U bit if the N bit is set.
272 // Canonicalize illegal integer setcc's.
273 if (isInteger && Op == ISD::SETUNE) // e.g. SETUGT | SETULT
276 return ISD::CondCode(Op);
279 /// getSetCCAndOperation - Return the result of a logical AND between different
280 /// comparisons of identical values: ((X op1 Y) & (X op2 Y)). This
281 /// function returns zero if it is not possible to represent the resultant
283 ISD::CondCode ISD::getSetCCAndOperation(ISD::CondCode Op1, ISD::CondCode Op2,
285 if (isInteger && (isSignedOp(Op1) | isSignedOp(Op2)) == 3)
286 // Cannot fold a signed setcc with an unsigned setcc.
287 return ISD::SETCC_INVALID;
289 // Combine all of the condition bits.
290 ISD::CondCode Result = ISD::CondCode(Op1 & Op2);
292 // Canonicalize illegal integer setcc's.
296 case ISD::SETUO : Result = ISD::SETFALSE; break; // SETUGT & SETULT
297 case ISD::SETOEQ: // SETEQ & SETU[LG]E
298 case ISD::SETUEQ: Result = ISD::SETEQ ; break; // SETUGE & SETULE
299 case ISD::SETOLT: Result = ISD::SETULT ; break; // SETULT & SETNE
300 case ISD::SETOGT: Result = ISD::SETUGT ; break; // SETUGT & SETNE
307 const TargetMachine &SelectionDAG::getTarget() const {
308 return MF->getTarget();
311 //===----------------------------------------------------------------------===//
312 // SDNode Profile Support
313 //===----------------------------------------------------------------------===//
315 /// AddNodeIDOpcode - Add the node opcode to the NodeID data.
317 static void AddNodeIDOpcode(FoldingSetNodeID &ID, unsigned OpC) {
321 /// AddNodeIDValueTypes - Value type lists are intern'd so we can represent them
322 /// solely with their pointer.
323 static void AddNodeIDValueTypes(FoldingSetNodeID &ID, SDVTList VTList) {
324 ID.AddPointer(VTList.VTs);
327 /// AddNodeIDOperands - Various routines for adding operands to the NodeID data.
329 static void AddNodeIDOperands(FoldingSetNodeID &ID,
330 const SDValue *Ops, unsigned NumOps) {
331 for (; NumOps; --NumOps, ++Ops) {
332 ID.AddPointer(Ops->getNode());
333 ID.AddInteger(Ops->getResNo());
337 /// AddNodeIDOperands - Various routines for adding operands to the NodeID data.
339 static void AddNodeIDOperands(FoldingSetNodeID &ID,
340 const SDUse *Ops, unsigned NumOps) {
341 for (; NumOps; --NumOps, ++Ops) {
342 ID.AddPointer(Ops->getNode());
343 ID.AddInteger(Ops->getResNo());
347 static void AddNodeIDNode(FoldingSetNodeID &ID,
348 unsigned short OpC, SDVTList VTList,
349 const SDValue *OpList, unsigned N) {
350 AddNodeIDOpcode(ID, OpC);
351 AddNodeIDValueTypes(ID, VTList);
352 AddNodeIDOperands(ID, OpList, N);
355 /// AddNodeIDCustom - If this is an SDNode with special info, add this info to
357 static void AddNodeIDCustom(FoldingSetNodeID &ID, const SDNode *N) {
358 switch (N->getOpcode()) {
359 case ISD::TargetExternalSymbol:
360 case ISD::ExternalSymbol:
361 llvm_unreachable("Should only be used on nodes with operands");
362 default: break; // Normal nodes don't need extra info.
363 case ISD::TargetConstant:
365 ID.AddPointer(cast<ConstantSDNode>(N)->getConstantIntValue());
367 case ISD::TargetConstantFP:
368 case ISD::ConstantFP: {
369 ID.AddPointer(cast<ConstantFPSDNode>(N)->getConstantFPValue());
372 case ISD::TargetGlobalAddress:
373 case ISD::GlobalAddress:
374 case ISD::TargetGlobalTLSAddress:
375 case ISD::GlobalTLSAddress: {
376 const GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(N);
377 ID.AddPointer(GA->getGlobal());
378 ID.AddInteger(GA->getOffset());
379 ID.AddInteger(GA->getTargetFlags());
382 case ISD::BasicBlock:
383 ID.AddPointer(cast<BasicBlockSDNode>(N)->getBasicBlock());
386 ID.AddInteger(cast<RegisterSDNode>(N)->getReg());
390 ID.AddPointer(cast<SrcValueSDNode>(N)->getValue());
392 case ISD::FrameIndex:
393 case ISD::TargetFrameIndex:
394 ID.AddInteger(cast<FrameIndexSDNode>(N)->getIndex());
397 case ISD::TargetJumpTable:
398 ID.AddInteger(cast<JumpTableSDNode>(N)->getIndex());
399 ID.AddInteger(cast<JumpTableSDNode>(N)->getTargetFlags());
401 case ISD::ConstantPool:
402 case ISD::TargetConstantPool: {
403 const ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(N);
404 ID.AddInteger(CP->getAlignment());
405 ID.AddInteger(CP->getOffset());
406 if (CP->isMachineConstantPoolEntry())
407 CP->getMachineCPVal()->AddSelectionDAGCSEId(ID);
409 ID.AddPointer(CP->getConstVal());
410 ID.AddInteger(CP->getTargetFlags());
414 const LoadSDNode *LD = cast<LoadSDNode>(N);
415 ID.AddInteger(LD->getMemoryVT().getRawBits());
416 ID.AddInteger(LD->getRawSubclassData());
420 const StoreSDNode *ST = cast<StoreSDNode>(N);
421 ID.AddInteger(ST->getMemoryVT().getRawBits());
422 ID.AddInteger(ST->getRawSubclassData());
425 case ISD::ATOMIC_CMP_SWAP:
426 case ISD::ATOMIC_SWAP:
427 case ISD::ATOMIC_LOAD_ADD:
428 case ISD::ATOMIC_LOAD_SUB:
429 case ISD::ATOMIC_LOAD_AND:
430 case ISD::ATOMIC_LOAD_OR:
431 case ISD::ATOMIC_LOAD_XOR:
432 case ISD::ATOMIC_LOAD_NAND:
433 case ISD::ATOMIC_LOAD_MIN:
434 case ISD::ATOMIC_LOAD_MAX:
435 case ISD::ATOMIC_LOAD_UMIN:
436 case ISD::ATOMIC_LOAD_UMAX: {
437 const AtomicSDNode *AT = cast<AtomicSDNode>(N);
438 ID.AddInteger(AT->getMemoryVT().getRawBits());
439 ID.AddInteger(AT->getRawSubclassData());
442 case ISD::VECTOR_SHUFFLE: {
443 const ShuffleVectorSDNode *SVN = cast<ShuffleVectorSDNode>(N);
444 for (unsigned i = 0, e = N->getValueType(0).getVectorNumElements();
446 ID.AddInteger(SVN->getMaskElt(i));
449 case ISD::TargetBlockAddress:
450 case ISD::BlockAddress: {
451 ID.AddPointer(cast<BlockAddressSDNode>(N)->getBlockAddress());
452 ID.AddInteger(cast<BlockAddressSDNode>(N)->getTargetFlags());
455 } // end switch (N->getOpcode())
458 /// AddNodeIDNode - Generic routine for adding a nodes info to the NodeID
460 static void AddNodeIDNode(FoldingSetNodeID &ID, const SDNode *N) {
461 AddNodeIDOpcode(ID, N->getOpcode());
462 // Add the return value info.
463 AddNodeIDValueTypes(ID, N->getVTList());
464 // Add the operand info.
465 AddNodeIDOperands(ID, N->op_begin(), N->getNumOperands());
467 // Handle SDNode leafs with special info.
468 AddNodeIDCustom(ID, N);
471 /// encodeMemSDNodeFlags - Generic routine for computing a value for use in
472 /// the CSE map that carries volatility, temporalness, indexing mode, and
473 /// extension/truncation information.
475 static inline unsigned
476 encodeMemSDNodeFlags(int ConvType, ISD::MemIndexedMode AM, bool isVolatile,
477 bool isNonTemporal) {
478 assert((ConvType & 3) == ConvType &&
479 "ConvType may not require more than 2 bits!");
480 assert((AM & 7) == AM &&
481 "AM may not require more than 3 bits!");
485 (isNonTemporal << 6);
488 //===----------------------------------------------------------------------===//
489 // SelectionDAG Class
490 //===----------------------------------------------------------------------===//
492 /// doNotCSE - Return true if CSE should not be performed for this node.
493 static bool doNotCSE(SDNode *N) {
494 if (N->getValueType(0) == MVT::Flag)
495 return true; // Never CSE anything that produces a flag.
497 switch (N->getOpcode()) {
499 case ISD::HANDLENODE:
501 return true; // Never CSE these nodes.
504 // Check that remaining values produced are not flags.
505 for (unsigned i = 1, e = N->getNumValues(); i != e; ++i)
506 if (N->getValueType(i) == MVT::Flag)
507 return true; // Never CSE anything that produces a flag.
512 /// RemoveDeadNodes - This method deletes all unreachable nodes in the
514 void SelectionDAG::RemoveDeadNodes() {
515 // Create a dummy node (which is not added to allnodes), that adds a reference
516 // to the root node, preventing it from being deleted.
517 HandleSDNode Dummy(getRoot());
519 SmallVector<SDNode*, 128> DeadNodes;
521 // Add all obviously-dead nodes to the DeadNodes worklist.
522 for (allnodes_iterator I = allnodes_begin(), E = allnodes_end(); I != E; ++I)
524 DeadNodes.push_back(I);
526 RemoveDeadNodes(DeadNodes);
528 // If the root changed (e.g. it was a dead load, update the root).
529 setRoot(Dummy.getValue());
532 /// RemoveDeadNodes - This method deletes the unreachable nodes in the
533 /// given list, and any nodes that become unreachable as a result.
534 void SelectionDAG::RemoveDeadNodes(SmallVectorImpl<SDNode *> &DeadNodes,
535 DAGUpdateListener *UpdateListener) {
537 // Process the worklist, deleting the nodes and adding their uses to the
539 while (!DeadNodes.empty()) {
540 SDNode *N = DeadNodes.pop_back_val();
543 UpdateListener->NodeDeleted(N, 0);
545 // Take the node out of the appropriate CSE map.
546 RemoveNodeFromCSEMaps(N);
548 // Next, brutally remove the operand list. This is safe to do, as there are
549 // no cycles in the graph.
550 for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ) {
552 SDNode *Operand = Use.getNode();
555 // Now that we removed this operand, see if there are no uses of it left.
556 if (Operand->use_empty())
557 DeadNodes.push_back(Operand);
564 void SelectionDAG::RemoveDeadNode(SDNode *N, DAGUpdateListener *UpdateListener){
565 SmallVector<SDNode*, 16> DeadNodes(1, N);
566 RemoveDeadNodes(DeadNodes, UpdateListener);
569 void SelectionDAG::DeleteNode(SDNode *N) {
570 // First take this out of the appropriate CSE map.
571 RemoveNodeFromCSEMaps(N);
573 // Finally, remove uses due to operands of this node, remove from the
574 // AllNodes list, and delete the node.
575 DeleteNodeNotInCSEMaps(N);
578 void SelectionDAG::DeleteNodeNotInCSEMaps(SDNode *N) {
579 assert(N != AllNodes.begin() && "Cannot delete the entry node!");
580 assert(N->use_empty() && "Cannot delete a node that is not dead!");
582 // Drop all of the operands and decrement used node's use counts.
588 void SelectionDAG::DeallocateNode(SDNode *N) {
589 if (N->OperandsNeedDelete)
590 delete[] N->OperandList;
592 // Set the opcode to DELETED_NODE to help catch bugs when node
593 // memory is reallocated.
594 N->NodeType = ISD::DELETED_NODE;
596 NodeAllocator.Deallocate(AllNodes.remove(N));
598 // Remove the ordering of this node.
601 // If any of the SDDbgValue nodes refer to this SDNode, invalidate them.
602 SmallVector<SDDbgValue*, 2> &DbgVals = DbgInfo->getSDDbgValues(N);
603 for (unsigned i = 0, e = DbgVals.size(); i != e; ++i)
604 DbgVals[i]->setIsInvalidated();
607 /// RemoveNodeFromCSEMaps - Take the specified node out of the CSE map that
608 /// correspond to it. This is useful when we're about to delete or repurpose
609 /// the node. We don't want future request for structurally identical nodes
610 /// to return N anymore.
611 bool SelectionDAG::RemoveNodeFromCSEMaps(SDNode *N) {
613 switch (N->getOpcode()) {
614 case ISD::EntryToken:
615 llvm_unreachable("EntryToken should not be in CSEMaps!");
617 case ISD::HANDLENODE: return false; // noop.
619 assert(CondCodeNodes[cast<CondCodeSDNode>(N)->get()] &&
620 "Cond code doesn't exist!");
621 Erased = CondCodeNodes[cast<CondCodeSDNode>(N)->get()] != 0;
622 CondCodeNodes[cast<CondCodeSDNode>(N)->get()] = 0;
624 case ISD::ExternalSymbol:
625 Erased = ExternalSymbols.erase(cast<ExternalSymbolSDNode>(N)->getSymbol());
627 case ISD::TargetExternalSymbol: {
628 ExternalSymbolSDNode *ESN = cast<ExternalSymbolSDNode>(N);
629 Erased = TargetExternalSymbols.erase(
630 std::pair<std::string,unsigned char>(ESN->getSymbol(),
631 ESN->getTargetFlags()));
634 case ISD::VALUETYPE: {
635 EVT VT = cast<VTSDNode>(N)->getVT();
636 if (VT.isExtended()) {
637 Erased = ExtendedValueTypeNodes.erase(VT);
639 Erased = ValueTypeNodes[VT.getSimpleVT().SimpleTy] != 0;
640 ValueTypeNodes[VT.getSimpleVT().SimpleTy] = 0;
645 // Remove it from the CSE Map.
646 Erased = CSEMap.RemoveNode(N);
650 // Verify that the node was actually in one of the CSE maps, unless it has a
651 // flag result (which cannot be CSE'd) or is one of the special cases that are
652 // not subject to CSE.
653 if (!Erased && N->getValueType(N->getNumValues()-1) != MVT::Flag &&
654 !N->isMachineOpcode() && !doNotCSE(N)) {
657 llvm_unreachable("Node is not in map!");
663 /// AddModifiedNodeToCSEMaps - The specified node has been removed from the CSE
664 /// maps and modified in place. Add it back to the CSE maps, unless an identical
665 /// node already exists, in which case transfer all its users to the existing
666 /// node. This transfer can potentially trigger recursive merging.
669 SelectionDAG::AddModifiedNodeToCSEMaps(SDNode *N,
670 DAGUpdateListener *UpdateListener) {
671 // For node types that aren't CSE'd, just act as if no identical node
674 SDNode *Existing = CSEMap.GetOrInsertNode(N);
676 // If there was already an existing matching node, use ReplaceAllUsesWith
677 // to replace the dead one with the existing one. This can cause
678 // recursive merging of other unrelated nodes down the line.
679 ReplaceAllUsesWith(N, Existing, UpdateListener);
681 // N is now dead. Inform the listener if it exists and delete it.
683 UpdateListener->NodeDeleted(N, Existing);
684 DeleteNodeNotInCSEMaps(N);
689 // If the node doesn't already exist, we updated it. Inform a listener if
692 UpdateListener->NodeUpdated(N);
695 /// FindModifiedNodeSlot - Find a slot for the specified node if its operands
696 /// were replaced with those specified. If this node is never memoized,
697 /// return null, otherwise return a pointer to the slot it would take. If a
698 /// node already exists with these operands, the slot will be non-null.
699 SDNode *SelectionDAG::FindModifiedNodeSlot(SDNode *N, SDValue Op,
704 SDValue Ops[] = { Op };
706 AddNodeIDNode(ID, N->getOpcode(), N->getVTList(), Ops, 1);
707 AddNodeIDCustom(ID, N);
708 SDNode *Node = CSEMap.FindNodeOrInsertPos(ID, InsertPos);
712 /// FindModifiedNodeSlot - Find a slot for the specified node if its operands
713 /// were replaced with those specified. If this node is never memoized,
714 /// return null, otherwise return a pointer to the slot it would take. If a
715 /// node already exists with these operands, the slot will be non-null.
716 SDNode *SelectionDAG::FindModifiedNodeSlot(SDNode *N,
717 SDValue Op1, SDValue Op2,
722 SDValue Ops[] = { Op1, Op2 };
724 AddNodeIDNode(ID, N->getOpcode(), N->getVTList(), Ops, 2);
725 AddNodeIDCustom(ID, N);
726 SDNode *Node = CSEMap.FindNodeOrInsertPos(ID, InsertPos);
731 /// FindModifiedNodeSlot - Find a slot for the specified node if its operands
732 /// were replaced with those specified. If this node is never memoized,
733 /// return null, otherwise return a pointer to the slot it would take. If a
734 /// node already exists with these operands, the slot will be non-null.
735 SDNode *SelectionDAG::FindModifiedNodeSlot(SDNode *N,
736 const SDValue *Ops,unsigned NumOps,
742 AddNodeIDNode(ID, N->getOpcode(), N->getVTList(), Ops, NumOps);
743 AddNodeIDCustom(ID, N);
744 SDNode *Node = CSEMap.FindNodeOrInsertPos(ID, InsertPos);
748 /// VerifyNode - Sanity check the given node. Aborts if it is invalid.
749 void SelectionDAG::VerifyNode(SDNode *N) {
750 switch (N->getOpcode()) {
753 case ISD::BUILD_PAIR: {
754 EVT VT = N->getValueType(0);
755 assert(N->getNumValues() == 1 && "Too many results!");
756 assert(!VT.isVector() && (VT.isInteger() || VT.isFloatingPoint()) &&
757 "Wrong return type!");
758 assert(N->getNumOperands() == 2 && "Wrong number of operands!");
759 assert(N->getOperand(0).getValueType() == N->getOperand(1).getValueType() &&
760 "Mismatched operand types!");
761 assert(N->getOperand(0).getValueType().isInteger() == VT.isInteger() &&
762 "Wrong operand type!");
763 assert(VT.getSizeInBits() == 2 * N->getOperand(0).getValueSizeInBits() &&
764 "Wrong return type size");
767 case ISD::BUILD_VECTOR: {
768 assert(N->getNumValues() == 1 && "Too many results!");
769 assert(N->getValueType(0).isVector() && "Wrong return type!");
770 assert(N->getNumOperands() == N->getValueType(0).getVectorNumElements() &&
771 "Wrong number of operands!");
772 EVT EltVT = N->getValueType(0).getVectorElementType();
773 for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ++I)
774 assert((I->getValueType() == EltVT ||
775 (EltVT.isInteger() && I->getValueType().isInteger() &&
776 EltVT.bitsLE(I->getValueType()))) &&
777 "Wrong operand type!");
783 /// getEVTAlignment - Compute the default alignment value for the
786 unsigned SelectionDAG::getEVTAlignment(EVT VT) const {
787 const Type *Ty = VT == MVT::iPTR ?
788 PointerType::get(Type::getInt8Ty(*getContext()), 0) :
789 VT.getTypeForEVT(*getContext());
791 return TLI.getTargetData()->getABITypeAlignment(Ty);
794 // EntryNode could meaningfully have debug info if we can find it...
795 SelectionDAG::SelectionDAG(TargetLowering &tli, FunctionLoweringInfo &fli)
796 : TLI(tli), FLI(fli),
797 EntryNode(ISD::EntryToken, DebugLoc(), getVTList(MVT::Other)),
798 Root(getEntryNode()), Ordering(0) {
799 AllNodes.push_back(&EntryNode);
800 Ordering = new SDNodeOrdering();
801 DbgInfo = new SDDbgInfo();
804 void SelectionDAG::init(MachineFunction &mf) {
806 Context = &mf.getFunction()->getContext();
809 SelectionDAG::~SelectionDAG() {
816 void SelectionDAG::allnodes_clear() {
817 assert(&*AllNodes.begin() == &EntryNode);
818 AllNodes.remove(AllNodes.begin());
819 while (!AllNodes.empty())
820 DeallocateNode(AllNodes.begin());
823 void SelectionDAG::clear() {
825 OperandAllocator.Reset();
828 ExtendedValueTypeNodes.clear();
829 ExternalSymbols.clear();
830 TargetExternalSymbols.clear();
831 std::fill(CondCodeNodes.begin(), CondCodeNodes.end(),
832 static_cast<CondCodeSDNode*>(0));
833 std::fill(ValueTypeNodes.begin(), ValueTypeNodes.end(),
834 static_cast<SDNode*>(0));
836 EntryNode.UseList = 0;
837 AllNodes.push_back(&EntryNode);
838 Root = getEntryNode();
840 Ordering = new SDNodeOrdering();
843 DbgInfo = new SDDbgInfo();
846 SDValue SelectionDAG::getSExtOrTrunc(SDValue Op, DebugLoc DL, EVT VT) {
847 return VT.bitsGT(Op.getValueType()) ?
848 getNode(ISD::SIGN_EXTEND, DL, VT, Op) :
849 getNode(ISD::TRUNCATE, DL, VT, Op);
852 SDValue SelectionDAG::getZExtOrTrunc(SDValue Op, DebugLoc DL, EVT VT) {
853 return VT.bitsGT(Op.getValueType()) ?
854 getNode(ISD::ZERO_EXTEND, DL, VT, Op) :
855 getNode(ISD::TRUNCATE, DL, VT, Op);
858 SDValue SelectionDAG::getZeroExtendInReg(SDValue Op, DebugLoc DL, EVT VT) {
859 assert(!VT.isVector() &&
860 "getZeroExtendInReg should use the vector element type instead of "
862 if (Op.getValueType() == VT) return Op;
863 unsigned BitWidth = Op.getValueType().getScalarType().getSizeInBits();
864 APInt Imm = APInt::getLowBitsSet(BitWidth,
866 return getNode(ISD::AND, DL, Op.getValueType(), Op,
867 getConstant(Imm, Op.getValueType()));
870 /// getNOT - Create a bitwise NOT operation as (XOR Val, -1).
872 SDValue SelectionDAG::getNOT(DebugLoc DL, SDValue Val, EVT VT) {
873 EVT EltVT = VT.getScalarType();
875 getConstant(APInt::getAllOnesValue(EltVT.getSizeInBits()), VT);
876 return getNode(ISD::XOR, DL, VT, Val, NegOne);
879 SDValue SelectionDAG::getConstant(uint64_t Val, EVT VT, bool isT) {
880 EVT EltVT = VT.getScalarType();
881 assert((EltVT.getSizeInBits() >= 64 ||
882 (uint64_t)((int64_t)Val >> EltVT.getSizeInBits()) + 1 < 2) &&
883 "getConstant with a uint64_t value that doesn't fit in the type!");
884 return getConstant(APInt(EltVT.getSizeInBits(), Val), VT, isT);
887 SDValue SelectionDAG::getConstant(const APInt &Val, EVT VT, bool isT) {
888 return getConstant(*ConstantInt::get(*Context, Val), VT, isT);
891 SDValue SelectionDAG::getConstant(const ConstantInt &Val, EVT VT, bool isT) {
892 assert(VT.isInteger() && "Cannot create FP integer constant!");
894 EVT EltVT = VT.getScalarType();
895 assert(Val.getBitWidth() == EltVT.getSizeInBits() &&
896 "APInt size does not match type size!");
898 unsigned Opc = isT ? ISD::TargetConstant : ISD::Constant;
900 AddNodeIDNode(ID, Opc, getVTList(EltVT), 0, 0);
904 if ((N = CSEMap.FindNodeOrInsertPos(ID, IP)))
906 return SDValue(N, 0);
909 N = new (NodeAllocator) ConstantSDNode(isT, &Val, EltVT);
910 CSEMap.InsertNode(N, IP);
911 AllNodes.push_back(N);
914 SDValue Result(N, 0);
916 SmallVector<SDValue, 8> Ops;
917 Ops.assign(VT.getVectorNumElements(), Result);
918 Result = getNode(ISD::BUILD_VECTOR, DebugLoc(), VT, &Ops[0], Ops.size());
923 SDValue SelectionDAG::getIntPtrConstant(uint64_t Val, bool isTarget) {
924 return getConstant(Val, TLI.getPointerTy(), isTarget);
928 SDValue SelectionDAG::getConstantFP(const APFloat& V, EVT VT, bool isTarget) {
929 return getConstantFP(*ConstantFP::get(*getContext(), V), VT, isTarget);
932 SDValue SelectionDAG::getConstantFP(const ConstantFP& V, EVT VT, bool isTarget){
933 assert(VT.isFloatingPoint() && "Cannot create integer FP constant!");
935 EVT EltVT = VT.getScalarType();
937 // Do the map lookup using the actual bit pattern for the floating point
938 // value, so that we don't have problems with 0.0 comparing equal to -0.0, and
939 // we don't have issues with SNANs.
940 unsigned Opc = isTarget ? ISD::TargetConstantFP : ISD::ConstantFP;
942 AddNodeIDNode(ID, Opc, getVTList(EltVT), 0, 0);
946 if ((N = CSEMap.FindNodeOrInsertPos(ID, IP)))
948 return SDValue(N, 0);
951 N = new (NodeAllocator) ConstantFPSDNode(isTarget, &V, EltVT);
952 CSEMap.InsertNode(N, IP);
953 AllNodes.push_back(N);
956 SDValue Result(N, 0);
958 SmallVector<SDValue, 8> Ops;
959 Ops.assign(VT.getVectorNumElements(), Result);
960 // FIXME DebugLoc info might be appropriate here
961 Result = getNode(ISD::BUILD_VECTOR, DebugLoc(), VT, &Ops[0], Ops.size());
966 SDValue SelectionDAG::getConstantFP(double Val, EVT VT, bool isTarget) {
967 EVT EltVT = VT.getScalarType();
969 return getConstantFP(APFloat((float)Val), VT, isTarget);
971 return getConstantFP(APFloat(Val), VT, isTarget);
974 SDValue SelectionDAG::getGlobalAddress(const GlobalValue *GV,
975 EVT VT, int64_t Offset,
977 unsigned char TargetFlags) {
978 assert((TargetFlags == 0 || isTargetGA) &&
979 "Cannot set target flags on target-independent globals");
981 // Truncate (with sign-extension) the offset value to the pointer size.
982 EVT PTy = TLI.getPointerTy();
983 unsigned BitWidth = PTy.getSizeInBits();
985 Offset = (Offset << (64 - BitWidth) >> (64 - BitWidth));
987 const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV);
989 // If GV is an alias then use the aliasee for determining thread-localness.
990 if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV))
991 GVar = dyn_cast_or_null<GlobalVariable>(GA->resolveAliasedGlobal(false));
995 if (GVar && GVar->isThreadLocal())
996 Opc = isTargetGA ? ISD::TargetGlobalTLSAddress : ISD::GlobalTLSAddress;
998 Opc = isTargetGA ? ISD::TargetGlobalAddress : ISD::GlobalAddress;
1000 FoldingSetNodeID ID;
1001 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0);
1003 ID.AddInteger(Offset);
1004 ID.AddInteger(TargetFlags);
1006 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1007 return SDValue(E, 0);
1009 SDNode *N = new (NodeAllocator) GlobalAddressSDNode(Opc, GV, VT,
1010 Offset, TargetFlags);
1011 CSEMap.InsertNode(N, IP);
1012 AllNodes.push_back(N);
1013 return SDValue(N, 0);
1016 SDValue SelectionDAG::getFrameIndex(int FI, EVT VT, bool isTarget) {
1017 unsigned Opc = isTarget ? ISD::TargetFrameIndex : ISD::FrameIndex;
1018 FoldingSetNodeID ID;
1019 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0);
1022 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1023 return SDValue(E, 0);
1025 SDNode *N = new (NodeAllocator) FrameIndexSDNode(FI, VT, isTarget);
1026 CSEMap.InsertNode(N, IP);
1027 AllNodes.push_back(N);
1028 return SDValue(N, 0);
1031 SDValue SelectionDAG::getJumpTable(int JTI, EVT VT, bool isTarget,
1032 unsigned char TargetFlags) {
1033 assert((TargetFlags == 0 || isTarget) &&
1034 "Cannot set target flags on target-independent jump tables");
1035 unsigned Opc = isTarget ? ISD::TargetJumpTable : ISD::JumpTable;
1036 FoldingSetNodeID ID;
1037 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0);
1039 ID.AddInteger(TargetFlags);
1041 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1042 return SDValue(E, 0);
1044 SDNode *N = new (NodeAllocator) JumpTableSDNode(JTI, VT, isTarget,
1046 CSEMap.InsertNode(N, IP);
1047 AllNodes.push_back(N);
1048 return SDValue(N, 0);
1051 SDValue SelectionDAG::getConstantPool(Constant *C, EVT VT,
1052 unsigned Alignment, int Offset,
1054 unsigned char TargetFlags) {
1055 assert((TargetFlags == 0 || isTarget) &&
1056 "Cannot set target flags on target-independent globals");
1058 Alignment = TLI.getTargetData()->getPrefTypeAlignment(C->getType());
1059 unsigned Opc = isTarget ? ISD::TargetConstantPool : ISD::ConstantPool;
1060 FoldingSetNodeID ID;
1061 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0);
1062 ID.AddInteger(Alignment);
1063 ID.AddInteger(Offset);
1065 ID.AddInteger(TargetFlags);
1067 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1068 return SDValue(E, 0);
1070 SDNode *N = new (NodeAllocator) ConstantPoolSDNode(isTarget, C, VT, Offset,
1071 Alignment, TargetFlags);
1072 CSEMap.InsertNode(N, IP);
1073 AllNodes.push_back(N);
1074 return SDValue(N, 0);
1078 SDValue SelectionDAG::getConstantPool(MachineConstantPoolValue *C, EVT VT,
1079 unsigned Alignment, int Offset,
1081 unsigned char TargetFlags) {
1082 assert((TargetFlags == 0 || isTarget) &&
1083 "Cannot set target flags on target-independent globals");
1085 Alignment = TLI.getTargetData()->getPrefTypeAlignment(C->getType());
1086 unsigned Opc = isTarget ? ISD::TargetConstantPool : ISD::ConstantPool;
1087 FoldingSetNodeID ID;
1088 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0);
1089 ID.AddInteger(Alignment);
1090 ID.AddInteger(Offset);
1091 C->AddSelectionDAGCSEId(ID);
1092 ID.AddInteger(TargetFlags);
1094 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1095 return SDValue(E, 0);
1097 SDNode *N = new (NodeAllocator) ConstantPoolSDNode(isTarget, C, VT, Offset,
1098 Alignment, TargetFlags);
1099 CSEMap.InsertNode(N, IP);
1100 AllNodes.push_back(N);
1101 return SDValue(N, 0);
1104 SDValue SelectionDAG::getBasicBlock(MachineBasicBlock *MBB) {
1105 FoldingSetNodeID ID;
1106 AddNodeIDNode(ID, ISD::BasicBlock, getVTList(MVT::Other), 0, 0);
1109 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1110 return SDValue(E, 0);
1112 SDNode *N = new (NodeAllocator) BasicBlockSDNode(MBB);
1113 CSEMap.InsertNode(N, IP);
1114 AllNodes.push_back(N);
1115 return SDValue(N, 0);
1118 SDValue SelectionDAG::getValueType(EVT VT) {
1119 if (VT.isSimple() && (unsigned)VT.getSimpleVT().SimpleTy >=
1120 ValueTypeNodes.size())
1121 ValueTypeNodes.resize(VT.getSimpleVT().SimpleTy+1);
1123 SDNode *&N = VT.isExtended() ?
1124 ExtendedValueTypeNodes[VT] : ValueTypeNodes[VT.getSimpleVT().SimpleTy];
1126 if (N) return SDValue(N, 0);
1127 N = new (NodeAllocator) VTSDNode(VT);
1128 AllNodes.push_back(N);
1129 return SDValue(N, 0);
1132 SDValue SelectionDAG::getExternalSymbol(const char *Sym, EVT VT) {
1133 SDNode *&N = ExternalSymbols[Sym];
1134 if (N) return SDValue(N, 0);
1135 N = new (NodeAllocator) ExternalSymbolSDNode(false, Sym, 0, VT);
1136 AllNodes.push_back(N);
1137 return SDValue(N, 0);
1140 SDValue SelectionDAG::getTargetExternalSymbol(const char *Sym, EVT VT,
1141 unsigned char TargetFlags) {
1143 TargetExternalSymbols[std::pair<std::string,unsigned char>(Sym,
1145 if (N) return SDValue(N, 0);
1146 N = new (NodeAllocator) ExternalSymbolSDNode(true, Sym, TargetFlags, VT);
1147 AllNodes.push_back(N);
1148 return SDValue(N, 0);
1151 SDValue SelectionDAG::getCondCode(ISD::CondCode Cond) {
1152 if ((unsigned)Cond >= CondCodeNodes.size())
1153 CondCodeNodes.resize(Cond+1);
1155 if (CondCodeNodes[Cond] == 0) {
1156 CondCodeSDNode *N = new (NodeAllocator) CondCodeSDNode(Cond);
1157 CondCodeNodes[Cond] = N;
1158 AllNodes.push_back(N);
1161 return SDValue(CondCodeNodes[Cond], 0);
1164 // commuteShuffle - swaps the values of N1 and N2, and swaps all indices in
1165 // the shuffle mask M that point at N1 to point at N2, and indices that point
1166 // N2 to point at N1.
1167 static void commuteShuffle(SDValue &N1, SDValue &N2, SmallVectorImpl<int> &M) {
1169 int NElts = M.size();
1170 for (int i = 0; i != NElts; ++i) {
1178 SDValue SelectionDAG::getVectorShuffle(EVT VT, DebugLoc dl, SDValue N1,
1179 SDValue N2, const int *Mask) {
1180 assert(N1.getValueType() == N2.getValueType() && "Invalid VECTOR_SHUFFLE");
1181 assert(VT.isVector() && N1.getValueType().isVector() &&
1182 "Vector Shuffle VTs must be a vectors");
1183 assert(VT.getVectorElementType() == N1.getValueType().getVectorElementType()
1184 && "Vector Shuffle VTs must have same element type");
1186 // Canonicalize shuffle undef, undef -> undef
1187 if (N1.getOpcode() == ISD::UNDEF && N2.getOpcode() == ISD::UNDEF)
1188 return getUNDEF(VT);
1190 // Validate that all indices in Mask are within the range of the elements
1191 // input to the shuffle.
1192 unsigned NElts = VT.getVectorNumElements();
1193 SmallVector<int, 8> MaskVec;
1194 for (unsigned i = 0; i != NElts; ++i) {
1195 assert(Mask[i] < (int)(NElts * 2) && "Index out of range");
1196 MaskVec.push_back(Mask[i]);
1199 // Canonicalize shuffle v, v -> v, undef
1202 for (unsigned i = 0; i != NElts; ++i)
1203 if (MaskVec[i] >= (int)NElts) MaskVec[i] -= NElts;
1206 // Canonicalize shuffle undef, v -> v, undef. Commute the shuffle mask.
1207 if (N1.getOpcode() == ISD::UNDEF)
1208 commuteShuffle(N1, N2, MaskVec);
1210 // Canonicalize all index into lhs, -> shuffle lhs, undef
1211 // Canonicalize all index into rhs, -> shuffle rhs, undef
1212 bool AllLHS = true, AllRHS = true;
1213 bool N2Undef = N2.getOpcode() == ISD::UNDEF;
1214 for (unsigned i = 0; i != NElts; ++i) {
1215 if (MaskVec[i] >= (int)NElts) {
1220 } else if (MaskVec[i] >= 0) {
1224 if (AllLHS && AllRHS)
1225 return getUNDEF(VT);
1226 if (AllLHS && !N2Undef)
1230 commuteShuffle(N1, N2, MaskVec);
1233 // If Identity shuffle, or all shuffle in to undef, return that node.
1234 bool AllUndef = true;
1235 bool Identity = true;
1236 for (unsigned i = 0; i != NElts; ++i) {
1237 if (MaskVec[i] >= 0 && MaskVec[i] != (int)i) Identity = false;
1238 if (MaskVec[i] >= 0) AllUndef = false;
1240 if (Identity && NElts == N1.getValueType().getVectorNumElements())
1243 return getUNDEF(VT);
1245 FoldingSetNodeID ID;
1246 SDValue Ops[2] = { N1, N2 };
1247 AddNodeIDNode(ID, ISD::VECTOR_SHUFFLE, getVTList(VT), Ops, 2);
1248 for (unsigned i = 0; i != NElts; ++i)
1249 ID.AddInteger(MaskVec[i]);
1252 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1253 return SDValue(E, 0);
1255 // Allocate the mask array for the node out of the BumpPtrAllocator, since
1256 // SDNode doesn't have access to it. This memory will be "leaked" when
1257 // the node is deallocated, but recovered when the NodeAllocator is released.
1258 int *MaskAlloc = OperandAllocator.Allocate<int>(NElts);
1259 memcpy(MaskAlloc, &MaskVec[0], NElts * sizeof(int));
1261 ShuffleVectorSDNode *N =
1262 new (NodeAllocator) ShuffleVectorSDNode(VT, dl, N1, N2, MaskAlloc);
1263 CSEMap.InsertNode(N, IP);
1264 AllNodes.push_back(N);
1265 return SDValue(N, 0);
1268 SDValue SelectionDAG::getConvertRndSat(EVT VT, DebugLoc dl,
1269 SDValue Val, SDValue DTy,
1270 SDValue STy, SDValue Rnd, SDValue Sat,
1271 ISD::CvtCode Code) {
1272 // If the src and dest types are the same and the conversion is between
1273 // integer types of the same sign or two floats, no conversion is necessary.
1275 (Code == ISD::CVT_UU || Code == ISD::CVT_SS || Code == ISD::CVT_FF))
1278 FoldingSetNodeID ID;
1279 SDValue Ops[] = { Val, DTy, STy, Rnd, Sat };
1280 AddNodeIDNode(ID, ISD::CONVERT_RNDSAT, getVTList(VT), &Ops[0], 5);
1282 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1283 return SDValue(E, 0);
1285 CvtRndSatSDNode *N = new (NodeAllocator) CvtRndSatSDNode(VT, dl, Ops, 5,
1287 CSEMap.InsertNode(N, IP);
1288 AllNodes.push_back(N);
1289 return SDValue(N, 0);
1292 SDValue SelectionDAG::getRegister(unsigned RegNo, EVT VT) {
1293 FoldingSetNodeID ID;
1294 AddNodeIDNode(ID, ISD::Register, getVTList(VT), 0, 0);
1295 ID.AddInteger(RegNo);
1297 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1298 return SDValue(E, 0);
1300 SDNode *N = new (NodeAllocator) RegisterSDNode(RegNo, VT);
1301 CSEMap.InsertNode(N, IP);
1302 AllNodes.push_back(N);
1303 return SDValue(N, 0);
1306 SDValue SelectionDAG::getEHLabel(DebugLoc dl, SDValue Root, MCSymbol *Label) {
1307 FoldingSetNodeID ID;
1308 SDValue Ops[] = { Root };
1309 AddNodeIDNode(ID, ISD::EH_LABEL, getVTList(MVT::Other), &Ops[0], 1);
1310 ID.AddPointer(Label);
1312 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1313 return SDValue(E, 0);
1315 SDNode *N = new (NodeAllocator) EHLabelSDNode(dl, Root, Label);
1316 CSEMap.InsertNode(N, IP);
1317 AllNodes.push_back(N);
1318 return SDValue(N, 0);
1322 SDValue SelectionDAG::getBlockAddress(BlockAddress *BA, EVT VT,
1324 unsigned char TargetFlags) {
1325 unsigned Opc = isTarget ? ISD::TargetBlockAddress : ISD::BlockAddress;
1327 FoldingSetNodeID ID;
1328 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0);
1330 ID.AddInteger(TargetFlags);
1332 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1333 return SDValue(E, 0);
1335 SDNode *N = new (NodeAllocator) BlockAddressSDNode(Opc, VT, BA, TargetFlags);
1336 CSEMap.InsertNode(N, IP);
1337 AllNodes.push_back(N);
1338 return SDValue(N, 0);
1341 SDValue SelectionDAG::getSrcValue(const Value *V) {
1342 assert((!V || V->getType()->isPointerTy()) &&
1343 "SrcValue is not a pointer?");
1345 FoldingSetNodeID ID;
1346 AddNodeIDNode(ID, ISD::SRCVALUE, getVTList(MVT::Other), 0, 0);
1350 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1351 return SDValue(E, 0);
1353 SDNode *N = new (NodeAllocator) SrcValueSDNode(V);
1354 CSEMap.InsertNode(N, IP);
1355 AllNodes.push_back(N);
1356 return SDValue(N, 0);
1359 /// getMDNode - Return an MDNodeSDNode which holds an MDNode.
1360 SDValue SelectionDAG::getMDNode(const MDNode *MD) {
1361 FoldingSetNodeID ID;
1362 AddNodeIDNode(ID, ISD::MDNODE_SDNODE, getVTList(MVT::Other), 0, 0);
1366 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1367 return SDValue(E, 0);
1369 SDNode *N = new (NodeAllocator) MDNodeSDNode(MD);
1370 CSEMap.InsertNode(N, IP);
1371 AllNodes.push_back(N);
1372 return SDValue(N, 0);
1376 /// getShiftAmountOperand - Return the specified value casted to
1377 /// the target's desired shift amount type.
1378 SDValue SelectionDAG::getShiftAmountOperand(SDValue Op) {
1379 EVT OpTy = Op.getValueType();
1380 MVT ShTy = TLI.getShiftAmountTy();
1381 if (OpTy == ShTy || OpTy.isVector()) return Op;
1383 ISD::NodeType Opcode = OpTy.bitsGT(ShTy) ? ISD::TRUNCATE : ISD::ZERO_EXTEND;
1384 return getNode(Opcode, Op.getDebugLoc(), ShTy, Op);
1387 /// CreateStackTemporary - Create a stack temporary, suitable for holding the
1388 /// specified value type.
1389 SDValue SelectionDAG::CreateStackTemporary(EVT VT, unsigned minAlign) {
1390 MachineFrameInfo *FrameInfo = getMachineFunction().getFrameInfo();
1391 unsigned ByteSize = VT.getStoreSize();
1392 const Type *Ty = VT.getTypeForEVT(*getContext());
1393 unsigned StackAlign =
1394 std::max((unsigned)TLI.getTargetData()->getPrefTypeAlignment(Ty), minAlign);
1396 int FrameIdx = FrameInfo->CreateStackObject(ByteSize, StackAlign, false);
1397 return getFrameIndex(FrameIdx, TLI.getPointerTy());
1400 /// CreateStackTemporary - Create a stack temporary suitable for holding
1401 /// either of the specified value types.
1402 SDValue SelectionDAG::CreateStackTemporary(EVT VT1, EVT VT2) {
1403 unsigned Bytes = std::max(VT1.getStoreSizeInBits(),
1404 VT2.getStoreSizeInBits())/8;
1405 const Type *Ty1 = VT1.getTypeForEVT(*getContext());
1406 const Type *Ty2 = VT2.getTypeForEVT(*getContext());
1407 const TargetData *TD = TLI.getTargetData();
1408 unsigned Align = std::max(TD->getPrefTypeAlignment(Ty1),
1409 TD->getPrefTypeAlignment(Ty2));
1411 MachineFrameInfo *FrameInfo = getMachineFunction().getFrameInfo();
1412 int FrameIdx = FrameInfo->CreateStackObject(Bytes, Align, false);
1413 return getFrameIndex(FrameIdx, TLI.getPointerTy());
1416 SDValue SelectionDAG::FoldSetCC(EVT VT, SDValue N1,
1417 SDValue N2, ISD::CondCode Cond, DebugLoc dl) {
1418 // These setcc operations always fold.
1422 case ISD::SETFALSE2: return getConstant(0, VT);
1424 case ISD::SETTRUE2: return getConstant(1, VT);
1436 assert(!N1.getValueType().isInteger() && "Illegal setcc for integer!");
1440 if (ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.getNode())) {
1441 const APInt &C2 = N2C->getAPIntValue();
1442 if (ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.getNode())) {
1443 const APInt &C1 = N1C->getAPIntValue();
1446 default: llvm_unreachable("Unknown integer setcc!");
1447 case ISD::SETEQ: return getConstant(C1 == C2, VT);
1448 case ISD::SETNE: return getConstant(C1 != C2, VT);
1449 case ISD::SETULT: return getConstant(C1.ult(C2), VT);
1450 case ISD::SETUGT: return getConstant(C1.ugt(C2), VT);
1451 case ISD::SETULE: return getConstant(C1.ule(C2), VT);
1452 case ISD::SETUGE: return getConstant(C1.uge(C2), VT);
1453 case ISD::SETLT: return getConstant(C1.slt(C2), VT);
1454 case ISD::SETGT: return getConstant(C1.sgt(C2), VT);
1455 case ISD::SETLE: return getConstant(C1.sle(C2), VT);
1456 case ISD::SETGE: return getConstant(C1.sge(C2), VT);
1460 if (ConstantFPSDNode *N1C = dyn_cast<ConstantFPSDNode>(N1.getNode())) {
1461 if (ConstantFPSDNode *N2C = dyn_cast<ConstantFPSDNode>(N2.getNode())) {
1462 // No compile time operations on this type yet.
1463 if (N1C->getValueType(0) == MVT::ppcf128)
1466 APFloat::cmpResult R = N1C->getValueAPF().compare(N2C->getValueAPF());
1469 case ISD::SETEQ: if (R==APFloat::cmpUnordered)
1470 return getUNDEF(VT);
1472 case ISD::SETOEQ: return getConstant(R==APFloat::cmpEqual, VT);
1473 case ISD::SETNE: if (R==APFloat::cmpUnordered)
1474 return getUNDEF(VT);
1476 case ISD::SETONE: return getConstant(R==APFloat::cmpGreaterThan ||
1477 R==APFloat::cmpLessThan, VT);
1478 case ISD::SETLT: if (R==APFloat::cmpUnordered)
1479 return getUNDEF(VT);
1481 case ISD::SETOLT: return getConstant(R==APFloat::cmpLessThan, VT);
1482 case ISD::SETGT: if (R==APFloat::cmpUnordered)
1483 return getUNDEF(VT);
1485 case ISD::SETOGT: return getConstant(R==APFloat::cmpGreaterThan, VT);
1486 case ISD::SETLE: if (R==APFloat::cmpUnordered)
1487 return getUNDEF(VT);
1489 case ISD::SETOLE: return getConstant(R==APFloat::cmpLessThan ||
1490 R==APFloat::cmpEqual, VT);
1491 case ISD::SETGE: if (R==APFloat::cmpUnordered)
1492 return getUNDEF(VT);
1494 case ISD::SETOGE: return getConstant(R==APFloat::cmpGreaterThan ||
1495 R==APFloat::cmpEqual, VT);
1496 case ISD::SETO: return getConstant(R!=APFloat::cmpUnordered, VT);
1497 case ISD::SETUO: return getConstant(R==APFloat::cmpUnordered, VT);
1498 case ISD::SETUEQ: return getConstant(R==APFloat::cmpUnordered ||
1499 R==APFloat::cmpEqual, VT);
1500 case ISD::SETUNE: return getConstant(R!=APFloat::cmpEqual, VT);
1501 case ISD::SETULT: return getConstant(R==APFloat::cmpUnordered ||
1502 R==APFloat::cmpLessThan, VT);
1503 case ISD::SETUGT: return getConstant(R==APFloat::cmpGreaterThan ||
1504 R==APFloat::cmpUnordered, VT);
1505 case ISD::SETULE: return getConstant(R!=APFloat::cmpGreaterThan, VT);
1506 case ISD::SETUGE: return getConstant(R!=APFloat::cmpLessThan, VT);
1509 // Ensure that the constant occurs on the RHS.
1510 return getSetCC(dl, VT, N2, N1, ISD::getSetCCSwappedOperands(Cond));
1514 // Could not fold it.
1518 /// SignBitIsZero - Return true if the sign bit of Op is known to be zero. We
1519 /// use this predicate to simplify operations downstream.
1520 bool SelectionDAG::SignBitIsZero(SDValue Op, unsigned Depth) const {
1521 // This predicate is not safe for vector operations.
1522 if (Op.getValueType().isVector())
1525 unsigned BitWidth = Op.getValueType().getScalarType().getSizeInBits();
1526 return MaskedValueIsZero(Op, APInt::getSignBit(BitWidth), Depth);
1529 /// MaskedValueIsZero - Return true if 'V & Mask' is known to be zero. We use
1530 /// this predicate to simplify operations downstream. Mask is known to be zero
1531 /// for bits that V cannot have.
1532 bool SelectionDAG::MaskedValueIsZero(SDValue Op, const APInt &Mask,
1533 unsigned Depth) const {
1534 APInt KnownZero, KnownOne;
1535 ComputeMaskedBits(Op, Mask, KnownZero, KnownOne, Depth);
1536 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1537 return (KnownZero & Mask) == Mask;
1540 /// ComputeMaskedBits - Determine which of the bits specified in Mask are
1541 /// known to be either zero or one and return them in the KnownZero/KnownOne
1542 /// bitsets. This code only analyzes bits in Mask, in order to short-circuit
1544 void SelectionDAG::ComputeMaskedBits(SDValue Op, const APInt &Mask,
1545 APInt &KnownZero, APInt &KnownOne,
1546 unsigned Depth) const {
1547 unsigned BitWidth = Mask.getBitWidth();
1548 assert(BitWidth == Op.getValueType().getScalarType().getSizeInBits() &&
1549 "Mask size mismatches value type size!");
1551 KnownZero = KnownOne = APInt(BitWidth, 0); // Don't know anything.
1552 if (Depth == 6 || Mask == 0)
1553 return; // Limit search depth.
1555 APInt KnownZero2, KnownOne2;
1557 switch (Op.getOpcode()) {
1559 // We know all of the bits for a constant!
1560 KnownOne = cast<ConstantSDNode>(Op)->getAPIntValue() & Mask;
1561 KnownZero = ~KnownOne & Mask;
1564 // If either the LHS or the RHS are Zero, the result is zero.
1565 ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero, KnownOne, Depth+1);
1566 ComputeMaskedBits(Op.getOperand(0), Mask & ~KnownZero,
1567 KnownZero2, KnownOne2, Depth+1);
1568 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1569 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1571 // Output known-1 bits are only known if set in both the LHS & RHS.
1572 KnownOne &= KnownOne2;
1573 // Output known-0 are known to be clear if zero in either the LHS | RHS.
1574 KnownZero |= KnownZero2;
1577 ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero, KnownOne, Depth+1);
1578 ComputeMaskedBits(Op.getOperand(0), Mask & ~KnownOne,
1579 KnownZero2, KnownOne2, Depth+1);
1580 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1581 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1583 // Output known-0 bits are only known if clear in both the LHS & RHS.
1584 KnownZero &= KnownZero2;
1585 // Output known-1 are known to be set if set in either the LHS | RHS.
1586 KnownOne |= KnownOne2;
1589 ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero, KnownOne, Depth+1);
1590 ComputeMaskedBits(Op.getOperand(0), Mask, KnownZero2, KnownOne2, Depth+1);
1591 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1592 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1594 // Output known-0 bits are known if clear or set in both the LHS & RHS.
1595 APInt KnownZeroOut = (KnownZero & KnownZero2) | (KnownOne & KnownOne2);
1596 // Output known-1 are known to be set if set in only one of the LHS, RHS.
1597 KnownOne = (KnownZero & KnownOne2) | (KnownOne & KnownZero2);
1598 KnownZero = KnownZeroOut;
1602 APInt Mask2 = APInt::getAllOnesValue(BitWidth);
1603 ComputeMaskedBits(Op.getOperand(1), Mask2, KnownZero, KnownOne, Depth+1);
1604 ComputeMaskedBits(Op.getOperand(0), Mask2, KnownZero2, KnownOne2, Depth+1);
1605 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1606 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1608 // If low bits are zero in either operand, output low known-0 bits.
1609 // Also compute a conserative estimate for high known-0 bits.
1610 // More trickiness is possible, but this is sufficient for the
1611 // interesting case of alignment computation.
1613 unsigned TrailZ = KnownZero.countTrailingOnes() +
1614 KnownZero2.countTrailingOnes();
1615 unsigned LeadZ = std::max(KnownZero.countLeadingOnes() +
1616 KnownZero2.countLeadingOnes(),
1617 BitWidth) - BitWidth;
1619 TrailZ = std::min(TrailZ, BitWidth);
1620 LeadZ = std::min(LeadZ, BitWidth);
1621 KnownZero = APInt::getLowBitsSet(BitWidth, TrailZ) |
1622 APInt::getHighBitsSet(BitWidth, LeadZ);
1627 // For the purposes of computing leading zeros we can conservatively
1628 // treat a udiv as a logical right shift by the power of 2 known to
1629 // be less than the denominator.
1630 APInt AllOnes = APInt::getAllOnesValue(BitWidth);
1631 ComputeMaskedBits(Op.getOperand(0),
1632 AllOnes, KnownZero2, KnownOne2, Depth+1);
1633 unsigned LeadZ = KnownZero2.countLeadingOnes();
1637 ComputeMaskedBits(Op.getOperand(1),
1638 AllOnes, KnownZero2, KnownOne2, Depth+1);
1639 unsigned RHSUnknownLeadingOnes = KnownOne2.countLeadingZeros();
1640 if (RHSUnknownLeadingOnes != BitWidth)
1641 LeadZ = std::min(BitWidth,
1642 LeadZ + BitWidth - RHSUnknownLeadingOnes - 1);
1644 KnownZero = APInt::getHighBitsSet(BitWidth, LeadZ) & Mask;
1648 ComputeMaskedBits(Op.getOperand(2), Mask, KnownZero, KnownOne, Depth+1);
1649 ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero2, KnownOne2, Depth+1);
1650 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1651 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1653 // Only known if known in both the LHS and RHS.
1654 KnownOne &= KnownOne2;
1655 KnownZero &= KnownZero2;
1657 case ISD::SELECT_CC:
1658 ComputeMaskedBits(Op.getOperand(3), Mask, KnownZero, KnownOne, Depth+1);
1659 ComputeMaskedBits(Op.getOperand(2), Mask, KnownZero2, KnownOne2, Depth+1);
1660 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1661 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1663 // Only known if known in both the LHS and RHS.
1664 KnownOne &= KnownOne2;
1665 KnownZero &= KnownZero2;
1673 if (Op.getResNo() != 1)
1675 // The boolean result conforms to getBooleanContents. Fall through.
1677 // If we know the result of a setcc has the top bits zero, use this info.
1678 if (TLI.getBooleanContents() == TargetLowering::ZeroOrOneBooleanContent &&
1680 KnownZero |= APInt::getHighBitsSet(BitWidth, BitWidth - 1);
1683 // (shl X, C1) & C2 == 0 iff (X & C2 >>u C1) == 0
1684 if (ConstantSDNode *SA = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
1685 unsigned ShAmt = SA->getZExtValue();
1687 // If the shift count is an invalid immediate, don't do anything.
1688 if (ShAmt >= BitWidth)
1691 ComputeMaskedBits(Op.getOperand(0), Mask.lshr(ShAmt),
1692 KnownZero, KnownOne, Depth+1);
1693 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1694 KnownZero <<= ShAmt;
1696 // low bits known zero.
1697 KnownZero |= APInt::getLowBitsSet(BitWidth, ShAmt);
1701 // (ushr X, C1) & C2 == 0 iff (-1 >> C1) & C2 == 0
1702 if (ConstantSDNode *SA = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
1703 unsigned ShAmt = SA->getZExtValue();
1705 // If the shift count is an invalid immediate, don't do anything.
1706 if (ShAmt >= BitWidth)
1709 ComputeMaskedBits(Op.getOperand(0), (Mask << ShAmt),
1710 KnownZero, KnownOne, Depth+1);
1711 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1712 KnownZero = KnownZero.lshr(ShAmt);
1713 KnownOne = KnownOne.lshr(ShAmt);
1715 APInt HighBits = APInt::getHighBitsSet(BitWidth, ShAmt) & Mask;
1716 KnownZero |= HighBits; // High bits known zero.
1720 if (ConstantSDNode *SA = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
1721 unsigned ShAmt = SA->getZExtValue();
1723 // If the shift count is an invalid immediate, don't do anything.
1724 if (ShAmt >= BitWidth)
1727 APInt InDemandedMask = (Mask << ShAmt);
1728 // If any of the demanded bits are produced by the sign extension, we also
1729 // demand the input sign bit.
1730 APInt HighBits = APInt::getHighBitsSet(BitWidth, ShAmt) & Mask;
1731 if (HighBits.getBoolValue())
1732 InDemandedMask |= APInt::getSignBit(BitWidth);
1734 ComputeMaskedBits(Op.getOperand(0), InDemandedMask, KnownZero, KnownOne,
1736 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1737 KnownZero = KnownZero.lshr(ShAmt);
1738 KnownOne = KnownOne.lshr(ShAmt);
1740 // Handle the sign bits.
1741 APInt SignBit = APInt::getSignBit(BitWidth);
1742 SignBit = SignBit.lshr(ShAmt); // Adjust to where it is now in the mask.
1744 if (KnownZero.intersects(SignBit)) {
1745 KnownZero |= HighBits; // New bits are known zero.
1746 } else if (KnownOne.intersects(SignBit)) {
1747 KnownOne |= HighBits; // New bits are known one.
1751 case ISD::SIGN_EXTEND_INREG: {
1752 EVT EVT = cast<VTSDNode>(Op.getOperand(1))->getVT();
1753 unsigned EBits = EVT.getScalarType().getSizeInBits();
1755 // Sign extension. Compute the demanded bits in the result that are not
1756 // present in the input.
1757 APInt NewBits = APInt::getHighBitsSet(BitWidth, BitWidth - EBits) & Mask;
1759 APInt InSignBit = APInt::getSignBit(EBits);
1760 APInt InputDemandedBits = Mask & APInt::getLowBitsSet(BitWidth, EBits);
1762 // If the sign extended bits are demanded, we know that the sign
1764 InSignBit.zext(BitWidth);
1765 if (NewBits.getBoolValue())
1766 InputDemandedBits |= InSignBit;
1768 ComputeMaskedBits(Op.getOperand(0), InputDemandedBits,
1769 KnownZero, KnownOne, Depth+1);
1770 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1772 // If the sign bit of the input is known set or clear, then we know the
1773 // top bits of the result.
1774 if (KnownZero.intersects(InSignBit)) { // Input sign bit known clear
1775 KnownZero |= NewBits;
1776 KnownOne &= ~NewBits;
1777 } else if (KnownOne.intersects(InSignBit)) { // Input sign bit known set
1778 KnownOne |= NewBits;
1779 KnownZero &= ~NewBits;
1780 } else { // Input sign bit unknown
1781 KnownZero &= ~NewBits;
1782 KnownOne &= ~NewBits;
1789 unsigned LowBits = Log2_32(BitWidth)+1;
1790 KnownZero = APInt::getHighBitsSet(BitWidth, BitWidth - LowBits);
1795 if (ISD::isZEXTLoad(Op.getNode())) {
1796 LoadSDNode *LD = cast<LoadSDNode>(Op);
1797 EVT VT = LD->getMemoryVT();
1798 unsigned MemBits = VT.getScalarType().getSizeInBits();
1799 KnownZero |= APInt::getHighBitsSet(BitWidth, BitWidth - MemBits) & Mask;
1803 case ISD::ZERO_EXTEND: {
1804 EVT InVT = Op.getOperand(0).getValueType();
1805 unsigned InBits = InVT.getScalarType().getSizeInBits();
1806 APInt NewBits = APInt::getHighBitsSet(BitWidth, BitWidth - InBits) & Mask;
1807 APInt InMask = Mask;
1808 InMask.trunc(InBits);
1809 KnownZero.trunc(InBits);
1810 KnownOne.trunc(InBits);
1811 ComputeMaskedBits(Op.getOperand(0), InMask, KnownZero, KnownOne, Depth+1);
1812 KnownZero.zext(BitWidth);
1813 KnownOne.zext(BitWidth);
1814 KnownZero |= NewBits;
1817 case ISD::SIGN_EXTEND: {
1818 EVT InVT = Op.getOperand(0).getValueType();
1819 unsigned InBits = InVT.getScalarType().getSizeInBits();
1820 APInt InSignBit = APInt::getSignBit(InBits);
1821 APInt NewBits = APInt::getHighBitsSet(BitWidth, BitWidth - InBits) & Mask;
1822 APInt InMask = Mask;
1823 InMask.trunc(InBits);
1825 // If any of the sign extended bits are demanded, we know that the sign
1826 // bit is demanded. Temporarily set this bit in the mask for our callee.
1827 if (NewBits.getBoolValue())
1828 InMask |= InSignBit;
1830 KnownZero.trunc(InBits);
1831 KnownOne.trunc(InBits);
1832 ComputeMaskedBits(Op.getOperand(0), InMask, KnownZero, KnownOne, Depth+1);
1834 // Note if the sign bit is known to be zero or one.
1835 bool SignBitKnownZero = KnownZero.isNegative();
1836 bool SignBitKnownOne = KnownOne.isNegative();
1837 assert(!(SignBitKnownZero && SignBitKnownOne) &&
1838 "Sign bit can't be known to be both zero and one!");
1840 // If the sign bit wasn't actually demanded by our caller, we don't
1841 // want it set in the KnownZero and KnownOne result values. Reset the
1842 // mask and reapply it to the result values.
1844 InMask.trunc(InBits);
1845 KnownZero &= InMask;
1848 KnownZero.zext(BitWidth);
1849 KnownOne.zext(BitWidth);
1851 // If the sign bit is known zero or one, the top bits match.
1852 if (SignBitKnownZero)
1853 KnownZero |= NewBits;
1854 else if (SignBitKnownOne)
1855 KnownOne |= NewBits;
1858 case ISD::ANY_EXTEND: {
1859 EVT InVT = Op.getOperand(0).getValueType();
1860 unsigned InBits = InVT.getScalarType().getSizeInBits();
1861 APInt InMask = Mask;
1862 InMask.trunc(InBits);
1863 KnownZero.trunc(InBits);
1864 KnownOne.trunc(InBits);
1865 ComputeMaskedBits(Op.getOperand(0), InMask, KnownZero, KnownOne, Depth+1);
1866 KnownZero.zext(BitWidth);
1867 KnownOne.zext(BitWidth);
1870 case ISD::TRUNCATE: {
1871 EVT InVT = Op.getOperand(0).getValueType();
1872 unsigned InBits = InVT.getScalarType().getSizeInBits();
1873 APInt InMask = Mask;
1874 InMask.zext(InBits);
1875 KnownZero.zext(InBits);
1876 KnownOne.zext(InBits);
1877 ComputeMaskedBits(Op.getOperand(0), InMask, KnownZero, KnownOne, Depth+1);
1878 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1879 KnownZero.trunc(BitWidth);
1880 KnownOne.trunc(BitWidth);
1883 case ISD::AssertZext: {
1884 EVT VT = cast<VTSDNode>(Op.getOperand(1))->getVT();
1885 APInt InMask = APInt::getLowBitsSet(BitWidth, VT.getSizeInBits());
1886 ComputeMaskedBits(Op.getOperand(0), Mask & InMask, KnownZero,
1888 KnownZero |= (~InMask) & Mask;
1892 // All bits are zero except the low bit.
1893 KnownZero = APInt::getHighBitsSet(BitWidth, BitWidth - 1);
1897 if (ConstantSDNode *CLHS = dyn_cast<ConstantSDNode>(Op.getOperand(0))) {
1898 // We know that the top bits of C-X are clear if X contains less bits
1899 // than C (i.e. no wrap-around can happen). For example, 20-X is
1900 // positive if we can prove that X is >= 0 and < 16.
1901 if (CLHS->getAPIntValue().isNonNegative()) {
1902 unsigned NLZ = (CLHS->getAPIntValue()+1).countLeadingZeros();
1903 // NLZ can't be BitWidth with no sign bit
1904 APInt MaskV = APInt::getHighBitsSet(BitWidth, NLZ+1);
1905 ComputeMaskedBits(Op.getOperand(1), MaskV, KnownZero2, KnownOne2,
1908 // If all of the MaskV bits are known to be zero, then we know the
1909 // output top bits are zero, because we now know that the output is
1911 if ((KnownZero2 & MaskV) == MaskV) {
1912 unsigned NLZ2 = CLHS->getAPIntValue().countLeadingZeros();
1913 // Top bits known zero.
1914 KnownZero = APInt::getHighBitsSet(BitWidth, NLZ2) & Mask;
1921 // Output known-0 bits are known if clear or set in both the low clear bits
1922 // common to both LHS & RHS. For example, 8+(X<<3) is known to have the
1923 // low 3 bits clear.
1924 APInt Mask2 = APInt::getLowBitsSet(BitWidth, Mask.countTrailingOnes());
1925 ComputeMaskedBits(Op.getOperand(0), Mask2, KnownZero2, KnownOne2, Depth+1);
1926 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1927 unsigned KnownZeroOut = KnownZero2.countTrailingOnes();
1929 ComputeMaskedBits(Op.getOperand(1), Mask2, KnownZero2, KnownOne2, Depth+1);
1930 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1931 KnownZeroOut = std::min(KnownZeroOut,
1932 KnownZero2.countTrailingOnes());
1934 KnownZero |= APInt::getLowBitsSet(BitWidth, KnownZeroOut);
1938 if (ConstantSDNode *Rem = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
1939 const APInt &RA = Rem->getAPIntValue().abs();
1940 if (RA.isPowerOf2()) {
1941 APInt LowBits = RA - 1;
1942 APInt Mask2 = LowBits | APInt::getSignBit(BitWidth);
1943 ComputeMaskedBits(Op.getOperand(0), Mask2,KnownZero2,KnownOne2,Depth+1);
1945 // The low bits of the first operand are unchanged by the srem.
1946 KnownZero = KnownZero2 & LowBits;
1947 KnownOne = KnownOne2 & LowBits;
1949 // If the first operand is non-negative or has all low bits zero, then
1950 // the upper bits are all zero.
1951 if (KnownZero2[BitWidth-1] || ((KnownZero2 & LowBits) == LowBits))
1952 KnownZero |= ~LowBits;
1954 // If the first operand is negative and not all low bits are zero, then
1955 // the upper bits are all one.
1956 if (KnownOne2[BitWidth-1] && ((KnownOne2 & LowBits) != 0))
1957 KnownOne |= ~LowBits;
1962 assert((KnownZero & KnownOne) == 0&&"Bits known to be one AND zero?");
1967 if (ConstantSDNode *Rem = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
1968 const APInt &RA = Rem->getAPIntValue();
1969 if (RA.isPowerOf2()) {
1970 APInt LowBits = (RA - 1);
1971 APInt Mask2 = LowBits & Mask;
1972 KnownZero |= ~LowBits & Mask;
1973 ComputeMaskedBits(Op.getOperand(0), Mask2, KnownZero, KnownOne,Depth+1);
1974 assert((KnownZero & KnownOne) == 0&&"Bits known to be one AND zero?");
1979 // Since the result is less than or equal to either operand, any leading
1980 // zero bits in either operand must also exist in the result.
1981 APInt AllOnes = APInt::getAllOnesValue(BitWidth);
1982 ComputeMaskedBits(Op.getOperand(0), AllOnes, KnownZero, KnownOne,
1984 ComputeMaskedBits(Op.getOperand(1), AllOnes, KnownZero2, KnownOne2,
1987 uint32_t Leaders = std::max(KnownZero.countLeadingOnes(),
1988 KnownZero2.countLeadingOnes());
1990 KnownZero = APInt::getHighBitsSet(BitWidth, Leaders) & Mask;
1994 // Allow the target to implement this method for its nodes.
1995 if (Op.getOpcode() >= ISD::BUILTIN_OP_END) {
1996 case ISD::INTRINSIC_WO_CHAIN:
1997 case ISD::INTRINSIC_W_CHAIN:
1998 case ISD::INTRINSIC_VOID:
1999 TLI.computeMaskedBitsForTargetNode(Op, Mask, KnownZero, KnownOne, *this,
2006 /// ComputeNumSignBits - Return the number of times the sign bit of the
2007 /// register is replicated into the other bits. We know that at least 1 bit
2008 /// is always equal to the sign bit (itself), but other cases can give us
2009 /// information. For example, immediately after an "SRA X, 2", we know that
2010 /// the top 3 bits are all equal to each other, so we return 3.
2011 unsigned SelectionDAG::ComputeNumSignBits(SDValue Op, unsigned Depth) const{
2012 EVT VT = Op.getValueType();
2013 assert(VT.isInteger() && "Invalid VT!");
2014 unsigned VTBits = VT.getScalarType().getSizeInBits();
2016 unsigned FirstAnswer = 1;
2019 return 1; // Limit search depth.
2021 switch (Op.getOpcode()) {
2023 case ISD::AssertSext:
2024 Tmp = cast<VTSDNode>(Op.getOperand(1))->getVT().getSizeInBits();
2025 return VTBits-Tmp+1;
2026 case ISD::AssertZext:
2027 Tmp = cast<VTSDNode>(Op.getOperand(1))->getVT().getSizeInBits();
2030 case ISD::Constant: {
2031 const APInt &Val = cast<ConstantSDNode>(Op)->getAPIntValue();
2032 // If negative, return # leading ones.
2033 if (Val.isNegative())
2034 return Val.countLeadingOnes();
2036 // Return # leading zeros.
2037 return Val.countLeadingZeros();
2040 case ISD::SIGN_EXTEND:
2041 Tmp = VTBits-Op.getOperand(0).getValueType().getScalarType().getSizeInBits();
2042 return ComputeNumSignBits(Op.getOperand(0), Depth+1) + Tmp;
2044 case ISD::SIGN_EXTEND_INREG:
2045 // Max of the input and what this extends.
2047 cast<VTSDNode>(Op.getOperand(1))->getVT().getScalarType().getSizeInBits();
2050 Tmp2 = ComputeNumSignBits(Op.getOperand(0), Depth+1);
2051 return std::max(Tmp, Tmp2);
2054 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
2055 // SRA X, C -> adds C sign bits.
2056 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
2057 Tmp += C->getZExtValue();
2058 if (Tmp > VTBits) Tmp = VTBits;
2062 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
2063 // shl destroys sign bits.
2064 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
2065 if (C->getZExtValue() >= VTBits || // Bad shift.
2066 C->getZExtValue() >= Tmp) break; // Shifted all sign bits out.
2067 return Tmp - C->getZExtValue();
2072 case ISD::XOR: // NOT is handled here.
2073 // Logical binary ops preserve the number of sign bits at the worst.
2074 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
2076 Tmp2 = ComputeNumSignBits(Op.getOperand(1), Depth+1);
2077 FirstAnswer = std::min(Tmp, Tmp2);
2078 // We computed what we know about the sign bits as our first
2079 // answer. Now proceed to the generic code that uses
2080 // ComputeMaskedBits, and pick whichever answer is better.
2085 Tmp = ComputeNumSignBits(Op.getOperand(1), Depth+1);
2086 if (Tmp == 1) return 1; // Early out.
2087 Tmp2 = ComputeNumSignBits(Op.getOperand(2), Depth+1);
2088 return std::min(Tmp, Tmp2);
2096 if (Op.getResNo() != 1)
2098 // The boolean result conforms to getBooleanContents. Fall through.
2100 // If setcc returns 0/-1, all bits are sign bits.
2101 if (TLI.getBooleanContents() ==
2102 TargetLowering::ZeroOrNegativeOneBooleanContent)
2107 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
2108 unsigned RotAmt = C->getZExtValue() & (VTBits-1);
2110 // Handle rotate right by N like a rotate left by 32-N.
2111 if (Op.getOpcode() == ISD::ROTR)
2112 RotAmt = (VTBits-RotAmt) & (VTBits-1);
2114 // If we aren't rotating out all of the known-in sign bits, return the
2115 // number that are left. This handles rotl(sext(x), 1) for example.
2116 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
2117 if (Tmp > RotAmt+1) return Tmp-RotAmt;
2121 // Add can have at most one carry bit. Thus we know that the output
2122 // is, at worst, one more bit than the inputs.
2123 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
2124 if (Tmp == 1) return 1; // Early out.
2126 // Special case decrementing a value (ADD X, -1):
2127 if (ConstantSDNode *CRHS = dyn_cast<ConstantSDNode>(Op.getOperand(1)))
2128 if (CRHS->isAllOnesValue()) {
2129 APInt KnownZero, KnownOne;
2130 APInt Mask = APInt::getAllOnesValue(VTBits);
2131 ComputeMaskedBits(Op.getOperand(0), Mask, KnownZero, KnownOne, Depth+1);
2133 // If the input is known to be 0 or 1, the output is 0/-1, which is all
2135 if ((KnownZero | APInt(VTBits, 1)) == Mask)
2138 // If we are subtracting one from a positive number, there is no carry
2139 // out of the result.
2140 if (KnownZero.isNegative())
2144 Tmp2 = ComputeNumSignBits(Op.getOperand(1), Depth+1);
2145 if (Tmp2 == 1) return 1;
2146 return std::min(Tmp, Tmp2)-1;
2150 Tmp2 = ComputeNumSignBits(Op.getOperand(1), Depth+1);
2151 if (Tmp2 == 1) return 1;
2154 if (ConstantSDNode *CLHS = dyn_cast<ConstantSDNode>(Op.getOperand(0)))
2155 if (CLHS->isNullValue()) {
2156 APInt KnownZero, KnownOne;
2157 APInt Mask = APInt::getAllOnesValue(VTBits);
2158 ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero, KnownOne, Depth+1);
2159 // If the input is known to be 0 or 1, the output is 0/-1, which is all
2161 if ((KnownZero | APInt(VTBits, 1)) == Mask)
2164 // If the input is known to be positive (the sign bit is known clear),
2165 // the output of the NEG has the same number of sign bits as the input.
2166 if (KnownZero.isNegative())
2169 // Otherwise, we treat this like a SUB.
2172 // Sub can have at most one carry bit. Thus we know that the output
2173 // is, at worst, one more bit than the inputs.
2174 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
2175 if (Tmp == 1) return 1; // Early out.
2176 return std::min(Tmp, Tmp2)-1;
2179 // FIXME: it's tricky to do anything useful for this, but it is an important
2180 // case for targets like X86.
2184 // Handle LOADX separately here. EXTLOAD case will fallthrough.
2185 if (Op.getOpcode() == ISD::LOAD) {
2186 LoadSDNode *LD = cast<LoadSDNode>(Op);
2187 unsigned ExtType = LD->getExtensionType();
2190 case ISD::SEXTLOAD: // '17' bits known
2191 Tmp = LD->getMemoryVT().getScalarType().getSizeInBits();
2192 return VTBits-Tmp+1;
2193 case ISD::ZEXTLOAD: // '16' bits known
2194 Tmp = LD->getMemoryVT().getScalarType().getSizeInBits();
2199 // Allow the target to implement this method for its nodes.
2200 if (Op.getOpcode() >= ISD::BUILTIN_OP_END ||
2201 Op.getOpcode() == ISD::INTRINSIC_WO_CHAIN ||
2202 Op.getOpcode() == ISD::INTRINSIC_W_CHAIN ||
2203 Op.getOpcode() == ISD::INTRINSIC_VOID) {
2204 unsigned NumBits = TLI.ComputeNumSignBitsForTargetNode(Op, Depth);
2205 if (NumBits > 1) FirstAnswer = std::max(FirstAnswer, NumBits);
2208 // Finally, if we can prove that the top bits of the result are 0's or 1's,
2209 // use this information.
2210 APInt KnownZero, KnownOne;
2211 APInt Mask = APInt::getAllOnesValue(VTBits);
2212 ComputeMaskedBits(Op, Mask, KnownZero, KnownOne, Depth);
2214 if (KnownZero.isNegative()) { // sign bit is 0
2216 } else if (KnownOne.isNegative()) { // sign bit is 1;
2223 // Okay, we know that the sign bit in Mask is set. Use CLZ to determine
2224 // the number of identical bits in the top of the input value.
2226 Mask <<= Mask.getBitWidth()-VTBits;
2227 // Return # leading zeros. We use 'min' here in case Val was zero before
2228 // shifting. We don't want to return '64' as for an i32 "0".
2229 return std::max(FirstAnswer, std::min(VTBits, Mask.countLeadingZeros()));
2232 bool SelectionDAG::isKnownNeverNaN(SDValue Op) const {
2233 // If we're told that NaNs won't happen, assume they won't.
2234 if (FiniteOnlyFPMath())
2237 // If the value is a constant, we can obviously see if it is a NaN or not.
2238 if (const ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(Op))
2239 return !C->getValueAPF().isNaN();
2241 // TODO: Recognize more cases here.
2246 bool SelectionDAG::isKnownNeverZero(SDValue Op) const {
2247 // If the value is a constant, we can obviously see if it is a zero or not.
2248 if (const ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(Op))
2249 return !C->isZero();
2251 // TODO: Recognize more cases here.
2256 bool SelectionDAG::isEqualTo(SDValue A, SDValue B) const {
2257 // Check the obvious case.
2258 if (A == B) return true;
2260 // For for negative and positive zero.
2261 if (const ConstantFPSDNode *CA = dyn_cast<ConstantFPSDNode>(A))
2262 if (const ConstantFPSDNode *CB = dyn_cast<ConstantFPSDNode>(B))
2263 if (CA->isZero() && CB->isZero()) return true;
2265 // Otherwise they may not be equal.
2269 bool SelectionDAG::isVerifiedDebugInfoDesc(SDValue Op) const {
2270 GlobalAddressSDNode *GA = dyn_cast<GlobalAddressSDNode>(Op);
2271 if (!GA) return false;
2272 if (GA->getOffset() != 0) return false;
2273 GlobalVariable *GV = dyn_cast<GlobalVariable>(GA->getGlobal());
2274 if (!GV) return false;
2275 return MF->getMMI().hasDebugInfo();
2279 /// getShuffleScalarElt - Returns the scalar element that will make up the ith
2280 /// element of the result of the vector shuffle.
2281 SDValue SelectionDAG::getShuffleScalarElt(const ShuffleVectorSDNode *N,
2283 EVT VT = N->getValueType(0);
2284 DebugLoc dl = N->getDebugLoc();
2285 if (N->getMaskElt(i) < 0)
2286 return getUNDEF(VT.getVectorElementType());
2287 unsigned Index = N->getMaskElt(i);
2288 unsigned NumElems = VT.getVectorNumElements();
2289 SDValue V = (Index < NumElems) ? N->getOperand(0) : N->getOperand(1);
2292 if (V.getOpcode() == ISD::BIT_CONVERT) {
2293 V = V.getOperand(0);
2294 EVT VVT = V.getValueType();
2295 if (!VVT.isVector() || VVT.getVectorNumElements() != (unsigned)NumElems)
2298 if (V.getOpcode() == ISD::SCALAR_TO_VECTOR)
2299 return (Index == 0) ? V.getOperand(0)
2300 : getUNDEF(VT.getVectorElementType());
2301 if (V.getOpcode() == ISD::BUILD_VECTOR)
2302 return V.getOperand(Index);
2303 if (const ShuffleVectorSDNode *SVN = dyn_cast<ShuffleVectorSDNode>(V))
2304 return getShuffleScalarElt(SVN, Index);
2309 /// getNode - Gets or creates the specified node.
2311 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT) {
2312 FoldingSetNodeID ID;
2313 AddNodeIDNode(ID, Opcode, getVTList(VT), 0, 0);
2315 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
2316 return SDValue(E, 0);
2318 SDNode *N = new (NodeAllocator) SDNode(Opcode, DL, getVTList(VT));
2319 CSEMap.InsertNode(N, IP);
2321 AllNodes.push_back(N);
2325 return SDValue(N, 0);
2328 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL,
2329 EVT VT, SDValue Operand) {
2330 // Constant fold unary operations with an integer constant operand.
2331 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Operand.getNode())) {
2332 const APInt &Val = C->getAPIntValue();
2335 case ISD::SIGN_EXTEND:
2336 return getConstant(APInt(Val).sextOrTrunc(VT.getSizeInBits()), VT);
2337 case ISD::ANY_EXTEND:
2338 case ISD::ZERO_EXTEND:
2340 return getConstant(APInt(Val).zextOrTrunc(VT.getSizeInBits()), VT);
2341 case ISD::UINT_TO_FP:
2342 case ISD::SINT_TO_FP: {
2343 const uint64_t zero[] = {0, 0};
2344 // No compile time operations on ppcf128.
2345 if (VT == MVT::ppcf128) break;
2346 APFloat apf = APFloat(APInt(VT.getSizeInBits(), 2, zero));
2347 (void)apf.convertFromAPInt(Val,
2348 Opcode==ISD::SINT_TO_FP,
2349 APFloat::rmNearestTiesToEven);
2350 return getConstantFP(apf, VT);
2352 case ISD::BIT_CONVERT:
2353 if (VT == MVT::f32 && C->getValueType(0) == MVT::i32)
2354 return getConstantFP(Val.bitsToFloat(), VT);
2355 else if (VT == MVT::f64 && C->getValueType(0) == MVT::i64)
2356 return getConstantFP(Val.bitsToDouble(), VT);
2359 return getConstant(Val.byteSwap(), VT);
2361 return getConstant(Val.countPopulation(), VT);
2363 return getConstant(Val.countLeadingZeros(), VT);
2365 return getConstant(Val.countTrailingZeros(), VT);
2369 // Constant fold unary operations with a floating point constant operand.
2370 if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(Operand.getNode())) {
2371 APFloat V = C->getValueAPF(); // make copy
2372 if (VT != MVT::ppcf128 && Operand.getValueType() != MVT::ppcf128) {
2376 return getConstantFP(V, VT);
2379 return getConstantFP(V, VT);
2381 case ISD::FP_EXTEND: {
2383 // This can return overflow, underflow, or inexact; we don't care.
2384 // FIXME need to be more flexible about rounding mode.
2385 (void)V.convert(*EVTToAPFloatSemantics(VT),
2386 APFloat::rmNearestTiesToEven, &ignored);
2387 return getConstantFP(V, VT);
2389 case ISD::FP_TO_SINT:
2390 case ISD::FP_TO_UINT: {
2393 assert(integerPartWidth >= 64);
2394 // FIXME need to be more flexible about rounding mode.
2395 APFloat::opStatus s = V.convertToInteger(x, VT.getSizeInBits(),
2396 Opcode==ISD::FP_TO_SINT,
2397 APFloat::rmTowardZero, &ignored);
2398 if (s==APFloat::opInvalidOp) // inexact is OK, in fact usual
2400 APInt api(VT.getSizeInBits(), 2, x);
2401 return getConstant(api, VT);
2403 case ISD::BIT_CONVERT:
2404 if (VT == MVT::i32 && C->getValueType(0) == MVT::f32)
2405 return getConstant((uint32_t)V.bitcastToAPInt().getZExtValue(), VT);
2406 else if (VT == MVT::i64 && C->getValueType(0) == MVT::f64)
2407 return getConstant(V.bitcastToAPInt().getZExtValue(), VT);
2413 unsigned OpOpcode = Operand.getNode()->getOpcode();
2415 case ISD::TokenFactor:
2416 case ISD::MERGE_VALUES:
2417 case ISD::CONCAT_VECTORS:
2418 return Operand; // Factor, merge or concat of one node? No need.
2419 case ISD::FP_ROUND: llvm_unreachable("Invalid method to make FP_ROUND node");
2420 case ISD::FP_EXTEND:
2421 assert(VT.isFloatingPoint() &&
2422 Operand.getValueType().isFloatingPoint() && "Invalid FP cast!");
2423 if (Operand.getValueType() == VT) return Operand; // noop conversion.
2424 assert((!VT.isVector() ||
2425 VT.getVectorNumElements() ==
2426 Operand.getValueType().getVectorNumElements()) &&
2427 "Vector element count mismatch!");
2428 if (Operand.getOpcode() == ISD::UNDEF)
2429 return getUNDEF(VT);
2431 case ISD::SIGN_EXTEND:
2432 assert(VT.isInteger() && Operand.getValueType().isInteger() &&
2433 "Invalid SIGN_EXTEND!");
2434 if (Operand.getValueType() == VT) return Operand; // noop extension
2435 assert(Operand.getValueType().getScalarType().bitsLT(VT.getScalarType()) &&
2436 "Invalid sext node, dst < src!");
2437 assert((!VT.isVector() ||
2438 VT.getVectorNumElements() ==
2439 Operand.getValueType().getVectorNumElements()) &&
2440 "Vector element count mismatch!");
2441 if (OpOpcode == ISD::SIGN_EXTEND || OpOpcode == ISD::ZERO_EXTEND)
2442 return getNode(OpOpcode, DL, VT, Operand.getNode()->getOperand(0));
2444 case ISD::ZERO_EXTEND:
2445 assert(VT.isInteger() && Operand.getValueType().isInteger() &&
2446 "Invalid ZERO_EXTEND!");
2447 if (Operand.getValueType() == VT) return Operand; // noop extension
2448 assert(Operand.getValueType().getScalarType().bitsLT(VT.getScalarType()) &&
2449 "Invalid zext node, dst < src!");
2450 assert((!VT.isVector() ||
2451 VT.getVectorNumElements() ==
2452 Operand.getValueType().getVectorNumElements()) &&
2453 "Vector element count mismatch!");
2454 if (OpOpcode == ISD::ZERO_EXTEND) // (zext (zext x)) -> (zext x)
2455 return getNode(ISD::ZERO_EXTEND, DL, VT,
2456 Operand.getNode()->getOperand(0));
2458 case ISD::ANY_EXTEND:
2459 assert(VT.isInteger() && Operand.getValueType().isInteger() &&
2460 "Invalid ANY_EXTEND!");
2461 if (Operand.getValueType() == VT) return Operand; // noop extension
2462 assert(Operand.getValueType().getScalarType().bitsLT(VT.getScalarType()) &&
2463 "Invalid anyext node, dst < src!");
2464 assert((!VT.isVector() ||
2465 VT.getVectorNumElements() ==
2466 Operand.getValueType().getVectorNumElements()) &&
2467 "Vector element count mismatch!");
2468 if (OpOpcode == ISD::ZERO_EXTEND || OpOpcode == ISD::SIGN_EXTEND)
2469 // (ext (zext x)) -> (zext x) and (ext (sext x)) -> (sext x)
2470 return getNode(OpOpcode, DL, VT, Operand.getNode()->getOperand(0));
2473 assert(VT.isInteger() && Operand.getValueType().isInteger() &&
2474 "Invalid TRUNCATE!");
2475 if (Operand.getValueType() == VT) return Operand; // noop truncate
2476 assert(Operand.getValueType().getScalarType().bitsGT(VT.getScalarType()) &&
2477 "Invalid truncate node, src < dst!");
2478 assert((!VT.isVector() ||
2479 VT.getVectorNumElements() ==
2480 Operand.getValueType().getVectorNumElements()) &&
2481 "Vector element count mismatch!");
2482 if (OpOpcode == ISD::TRUNCATE)
2483 return getNode(ISD::TRUNCATE, DL, VT, Operand.getNode()->getOperand(0));
2484 else if (OpOpcode == ISD::ZERO_EXTEND || OpOpcode == ISD::SIGN_EXTEND ||
2485 OpOpcode == ISD::ANY_EXTEND) {
2486 // If the source is smaller than the dest, we still need an extend.
2487 if (Operand.getNode()->getOperand(0).getValueType().getScalarType()
2488 .bitsLT(VT.getScalarType()))
2489 return getNode(OpOpcode, DL, VT, Operand.getNode()->getOperand(0));
2490 else if (Operand.getNode()->getOperand(0).getValueType().bitsGT(VT))
2491 return getNode(ISD::TRUNCATE, DL, VT, Operand.getNode()->getOperand(0));
2493 return Operand.getNode()->getOperand(0);
2496 case ISD::BIT_CONVERT:
2497 // Basic sanity checking.
2498 assert(VT.getSizeInBits() == Operand.getValueType().getSizeInBits()
2499 && "Cannot BIT_CONVERT between types of different sizes!");
2500 if (VT == Operand.getValueType()) return Operand; // noop conversion.
2501 if (OpOpcode == ISD::BIT_CONVERT) // bitconv(bitconv(x)) -> bitconv(x)
2502 return getNode(ISD::BIT_CONVERT, DL, VT, Operand.getOperand(0));
2503 if (OpOpcode == ISD::UNDEF)
2504 return getUNDEF(VT);
2506 case ISD::SCALAR_TO_VECTOR:
2507 assert(VT.isVector() && !Operand.getValueType().isVector() &&
2508 (VT.getVectorElementType() == Operand.getValueType() ||
2509 (VT.getVectorElementType().isInteger() &&
2510 Operand.getValueType().isInteger() &&
2511 VT.getVectorElementType().bitsLE(Operand.getValueType()))) &&
2512 "Illegal SCALAR_TO_VECTOR node!");
2513 if (OpOpcode == ISD::UNDEF)
2514 return getUNDEF(VT);
2515 // scalar_to_vector(extract_vector_elt V, 0) -> V, top bits are undefined.
2516 if (OpOpcode == ISD::EXTRACT_VECTOR_ELT &&
2517 isa<ConstantSDNode>(Operand.getOperand(1)) &&
2518 Operand.getConstantOperandVal(1) == 0 &&
2519 Operand.getOperand(0).getValueType() == VT)
2520 return Operand.getOperand(0);
2523 // -(X-Y) -> (Y-X) is unsafe because when X==Y, -0.0 != +0.0
2524 if (UnsafeFPMath && OpOpcode == ISD::FSUB)
2525 return getNode(ISD::FSUB, DL, VT, Operand.getNode()->getOperand(1),
2526 Operand.getNode()->getOperand(0));
2527 if (OpOpcode == ISD::FNEG) // --X -> X
2528 return Operand.getNode()->getOperand(0);
2531 if (OpOpcode == ISD::FNEG) // abs(-X) -> abs(X)
2532 return getNode(ISD::FABS, DL, VT, Operand.getNode()->getOperand(0));
2537 SDVTList VTs = getVTList(VT);
2538 if (VT != MVT::Flag) { // Don't CSE flag producing nodes
2539 FoldingSetNodeID ID;
2540 SDValue Ops[1] = { Operand };
2541 AddNodeIDNode(ID, Opcode, VTs, Ops, 1);
2543 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
2544 return SDValue(E, 0);
2546 N = new (NodeAllocator) UnarySDNode(Opcode, DL, VTs, Operand);
2547 CSEMap.InsertNode(N, IP);
2549 N = new (NodeAllocator) UnarySDNode(Opcode, DL, VTs, Operand);
2552 AllNodes.push_back(N);
2556 return SDValue(N, 0);
2559 SDValue SelectionDAG::FoldConstantArithmetic(unsigned Opcode,
2561 ConstantSDNode *Cst1,
2562 ConstantSDNode *Cst2) {
2563 const APInt &C1 = Cst1->getAPIntValue(), &C2 = Cst2->getAPIntValue();
2566 case ISD::ADD: return getConstant(C1 + C2, VT);
2567 case ISD::SUB: return getConstant(C1 - C2, VT);
2568 case ISD::MUL: return getConstant(C1 * C2, VT);
2570 if (C2.getBoolValue()) return getConstant(C1.udiv(C2), VT);
2573 if (C2.getBoolValue()) return getConstant(C1.urem(C2), VT);
2576 if (C2.getBoolValue()) return getConstant(C1.sdiv(C2), VT);
2579 if (C2.getBoolValue()) return getConstant(C1.srem(C2), VT);
2581 case ISD::AND: return getConstant(C1 & C2, VT);
2582 case ISD::OR: return getConstant(C1 | C2, VT);
2583 case ISD::XOR: return getConstant(C1 ^ C2, VT);
2584 case ISD::SHL: return getConstant(C1 << C2, VT);
2585 case ISD::SRL: return getConstant(C1.lshr(C2), VT);
2586 case ISD::SRA: return getConstant(C1.ashr(C2), VT);
2587 case ISD::ROTL: return getConstant(C1.rotl(C2), VT);
2588 case ISD::ROTR: return getConstant(C1.rotr(C2), VT);
2595 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT,
2596 SDValue N1, SDValue N2) {
2597 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.getNode());
2598 ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.getNode());
2601 case ISD::TokenFactor:
2602 assert(VT == MVT::Other && N1.getValueType() == MVT::Other &&
2603 N2.getValueType() == MVT::Other && "Invalid token factor!");
2604 // Fold trivial token factors.
2605 if (N1.getOpcode() == ISD::EntryToken) return N2;
2606 if (N2.getOpcode() == ISD::EntryToken) return N1;
2607 if (N1 == N2) return N1;
2609 case ISD::CONCAT_VECTORS:
2610 // A CONCAT_VECTOR with all operands BUILD_VECTOR can be simplified to
2611 // one big BUILD_VECTOR.
2612 if (N1.getOpcode() == ISD::BUILD_VECTOR &&
2613 N2.getOpcode() == ISD::BUILD_VECTOR) {
2614 SmallVector<SDValue, 16> Elts(N1.getNode()->op_begin(), N1.getNode()->op_end());
2615 Elts.insert(Elts.end(), N2.getNode()->op_begin(), N2.getNode()->op_end());
2616 return getNode(ISD::BUILD_VECTOR, DL, VT, &Elts[0], Elts.size());
2620 assert(VT.isInteger() && N1.getValueType() == N2.getValueType() &&
2621 N1.getValueType() == VT && "Binary operator types must match!");
2622 // (X & 0) -> 0. This commonly occurs when legalizing i64 values, so it's
2623 // worth handling here.
2624 if (N2C && N2C->isNullValue())
2626 if (N2C && N2C->isAllOnesValue()) // X & -1 -> X
2633 assert(VT.isInteger() && N1.getValueType() == N2.getValueType() &&
2634 N1.getValueType() == VT && "Binary operator types must match!");
2635 // (X ^|+- 0) -> X. This commonly occurs when legalizing i64 values, so
2636 // it's worth handling here.
2637 if (N2C && N2C->isNullValue())
2647 assert(VT.isInteger() && "This operator does not apply to FP types!");
2655 if (Opcode == ISD::FADD) {
2657 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(N1))
2658 if (CFP->getValueAPF().isZero())
2661 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(N2))
2662 if (CFP->getValueAPF().isZero())
2664 } else if (Opcode == ISD::FSUB) {
2666 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(N2))
2667 if (CFP->getValueAPF().isZero())
2671 assert(N1.getValueType() == N2.getValueType() &&
2672 N1.getValueType() == VT && "Binary operator types must match!");
2674 case ISD::FCOPYSIGN: // N1 and result must match. N1/N2 need not match.
2675 assert(N1.getValueType() == VT &&
2676 N1.getValueType().isFloatingPoint() &&
2677 N2.getValueType().isFloatingPoint() &&
2678 "Invalid FCOPYSIGN!");
2685 assert(VT == N1.getValueType() &&
2686 "Shift operators return type must be the same as their first arg");
2687 assert(VT.isInteger() && N2.getValueType().isInteger() &&
2688 "Shifts only work on integers");
2690 // Always fold shifts of i1 values so the code generator doesn't need to
2691 // handle them. Since we know the size of the shift has to be less than the
2692 // size of the value, the shift/rotate count is guaranteed to be zero.
2695 if (N2C && N2C->isNullValue())
2698 case ISD::FP_ROUND_INREG: {
2699 EVT EVT = cast<VTSDNode>(N2)->getVT();
2700 assert(VT == N1.getValueType() && "Not an inreg round!");
2701 assert(VT.isFloatingPoint() && EVT.isFloatingPoint() &&
2702 "Cannot FP_ROUND_INREG integer types");
2703 assert(EVT.isVector() == VT.isVector() &&
2704 "FP_ROUND_INREG type should be vector iff the operand "
2706 assert((!EVT.isVector() ||
2707 EVT.getVectorNumElements() == VT.getVectorNumElements()) &&
2708 "Vector element counts must match in FP_ROUND_INREG");
2709 assert(EVT.bitsLE(VT) && "Not rounding down!");
2710 if (cast<VTSDNode>(N2)->getVT() == VT) return N1; // Not actually rounding.
2714 assert(VT.isFloatingPoint() &&
2715 N1.getValueType().isFloatingPoint() &&
2716 VT.bitsLE(N1.getValueType()) &&
2717 isa<ConstantSDNode>(N2) && "Invalid FP_ROUND!");
2718 if (N1.getValueType() == VT) return N1; // noop conversion.
2720 case ISD::AssertSext:
2721 case ISD::AssertZext: {
2722 EVT EVT = cast<VTSDNode>(N2)->getVT();
2723 assert(VT == N1.getValueType() && "Not an inreg extend!");
2724 assert(VT.isInteger() && EVT.isInteger() &&
2725 "Cannot *_EXTEND_INREG FP types");
2726 assert(!EVT.isVector() &&
2727 "AssertSExt/AssertZExt type should be the vector element type "
2728 "rather than the vector type!");
2729 assert(EVT.bitsLE(VT) && "Not extending!");
2730 if (VT == EVT) return N1; // noop assertion.
2733 case ISD::SIGN_EXTEND_INREG: {
2734 EVT EVT = cast<VTSDNode>(N2)->getVT();
2735 assert(VT == N1.getValueType() && "Not an inreg extend!");
2736 assert(VT.isInteger() && EVT.isInteger() &&
2737 "Cannot *_EXTEND_INREG FP types");
2738 assert(EVT.isVector() == VT.isVector() &&
2739 "SIGN_EXTEND_INREG type should be vector iff the operand "
2741 assert((!EVT.isVector() ||
2742 EVT.getVectorNumElements() == VT.getVectorNumElements()) &&
2743 "Vector element counts must match in SIGN_EXTEND_INREG");
2744 assert(EVT.bitsLE(VT) && "Not extending!");
2745 if (EVT == VT) return N1; // Not actually extending
2748 APInt Val = N1C->getAPIntValue();
2749 unsigned FromBits = EVT.getScalarType().getSizeInBits();
2750 Val <<= Val.getBitWidth()-FromBits;
2751 Val = Val.ashr(Val.getBitWidth()-FromBits);
2752 return getConstant(Val, VT);
2756 case ISD::EXTRACT_VECTOR_ELT:
2757 // EXTRACT_VECTOR_ELT of an UNDEF is an UNDEF.
2758 if (N1.getOpcode() == ISD::UNDEF)
2759 return getUNDEF(VT);
2761 // EXTRACT_VECTOR_ELT of CONCAT_VECTORS is often formed while lowering is
2762 // expanding copies of large vectors from registers.
2764 N1.getOpcode() == ISD::CONCAT_VECTORS &&
2765 N1.getNumOperands() > 0) {
2767 N1.getOperand(0).getValueType().getVectorNumElements();
2768 return getNode(ISD::EXTRACT_VECTOR_ELT, DL, VT,
2769 N1.getOperand(N2C->getZExtValue() / Factor),
2770 getConstant(N2C->getZExtValue() % Factor,
2771 N2.getValueType()));
2774 // EXTRACT_VECTOR_ELT of BUILD_VECTOR is often formed while lowering is
2775 // expanding large vector constants.
2776 if (N2C && N1.getOpcode() == ISD::BUILD_VECTOR) {
2777 SDValue Elt = N1.getOperand(N2C->getZExtValue());
2778 EVT VEltTy = N1.getValueType().getVectorElementType();
2779 if (Elt.getValueType() != VEltTy) {
2780 // If the vector element type is not legal, the BUILD_VECTOR operands
2781 // are promoted and implicitly truncated. Make that explicit here.
2782 Elt = getNode(ISD::TRUNCATE, DL, VEltTy, Elt);
2785 // If the vector element type is not legal, the EXTRACT_VECTOR_ELT
2786 // result is implicitly extended.
2787 Elt = getNode(ISD::ANY_EXTEND, DL, VT, Elt);
2792 // EXTRACT_VECTOR_ELT of INSERT_VECTOR_ELT is often formed when vector
2793 // operations are lowered to scalars.
2794 if (N1.getOpcode() == ISD::INSERT_VECTOR_ELT) {
2795 // If the indices are the same, return the inserted element else
2796 // if the indices are known different, extract the element from
2797 // the original vector.
2798 if (N1.getOperand(2) == N2) {
2799 if (VT == N1.getOperand(1).getValueType())
2800 return N1.getOperand(1);
2802 return getSExtOrTrunc(N1.getOperand(1), DL, VT);
2803 } else if (isa<ConstantSDNode>(N1.getOperand(2)) &&
2804 isa<ConstantSDNode>(N2))
2805 return getNode(ISD::EXTRACT_VECTOR_ELT, DL, VT, N1.getOperand(0), N2);
2808 case ISD::EXTRACT_ELEMENT:
2809 assert(N2C && (unsigned)N2C->getZExtValue() < 2 && "Bad EXTRACT_ELEMENT!");
2810 assert(!N1.getValueType().isVector() && !VT.isVector() &&
2811 (N1.getValueType().isInteger() == VT.isInteger()) &&
2812 "Wrong types for EXTRACT_ELEMENT!");
2814 // EXTRACT_ELEMENT of BUILD_PAIR is often formed while legalize is expanding
2815 // 64-bit integers into 32-bit parts. Instead of building the extract of
2816 // the BUILD_PAIR, only to have legalize rip it apart, just do it now.
2817 if (N1.getOpcode() == ISD::BUILD_PAIR)
2818 return N1.getOperand(N2C->getZExtValue());
2820 // EXTRACT_ELEMENT of a constant int is also very common.
2821 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N1)) {
2822 unsigned ElementSize = VT.getSizeInBits();
2823 unsigned Shift = ElementSize * N2C->getZExtValue();
2824 APInt ShiftedVal = C->getAPIntValue().lshr(Shift);
2825 return getConstant(ShiftedVal.trunc(ElementSize), VT);
2828 case ISD::EXTRACT_SUBVECTOR:
2829 if (N1.getValueType() == VT) // Trivial extraction.
2836 SDValue SV = FoldConstantArithmetic(Opcode, VT, N1C, N2C);
2837 if (SV.getNode()) return SV;
2838 } else { // Cannonicalize constant to RHS if commutative
2839 if (isCommutativeBinOp(Opcode)) {
2840 std::swap(N1C, N2C);
2846 // Constant fold FP operations.
2847 ConstantFPSDNode *N1CFP = dyn_cast<ConstantFPSDNode>(N1.getNode());
2848 ConstantFPSDNode *N2CFP = dyn_cast<ConstantFPSDNode>(N2.getNode());
2850 if (!N2CFP && isCommutativeBinOp(Opcode)) {
2851 // Cannonicalize constant to RHS if commutative
2852 std::swap(N1CFP, N2CFP);
2854 } else if (N2CFP && VT != MVT::ppcf128) {
2855 APFloat V1 = N1CFP->getValueAPF(), V2 = N2CFP->getValueAPF();
2856 APFloat::opStatus s;
2859 s = V1.add(V2, APFloat::rmNearestTiesToEven);
2860 if (s != APFloat::opInvalidOp)
2861 return getConstantFP(V1, VT);
2864 s = V1.subtract(V2, APFloat::rmNearestTiesToEven);
2865 if (s!=APFloat::opInvalidOp)
2866 return getConstantFP(V1, VT);
2869 s = V1.multiply(V2, APFloat::rmNearestTiesToEven);
2870 if (s!=APFloat::opInvalidOp)
2871 return getConstantFP(V1, VT);
2874 s = V1.divide(V2, APFloat::rmNearestTiesToEven);
2875 if (s!=APFloat::opInvalidOp && s!=APFloat::opDivByZero)
2876 return getConstantFP(V1, VT);
2879 s = V1.mod(V2, APFloat::rmNearestTiesToEven);
2880 if (s!=APFloat::opInvalidOp && s!=APFloat::opDivByZero)
2881 return getConstantFP(V1, VT);
2883 case ISD::FCOPYSIGN:
2885 return getConstantFP(V1, VT);
2891 // Canonicalize an UNDEF to the RHS, even over a constant.
2892 if (N1.getOpcode() == ISD::UNDEF) {
2893 if (isCommutativeBinOp(Opcode)) {
2897 case ISD::FP_ROUND_INREG:
2898 case ISD::SIGN_EXTEND_INREG:
2904 return N1; // fold op(undef, arg2) -> undef
2912 return getConstant(0, VT); // fold op(undef, arg2) -> 0
2913 // For vectors, we can't easily build an all zero vector, just return
2920 // Fold a bunch of operators when the RHS is undef.
2921 if (N2.getOpcode() == ISD::UNDEF) {
2924 if (N1.getOpcode() == ISD::UNDEF)
2925 // Handle undef ^ undef -> 0 special case. This is a common
2927 return getConstant(0, VT);
2937 return N2; // fold op(arg1, undef) -> undef
2951 return getConstant(0, VT); // fold op(arg1, undef) -> 0
2952 // For vectors, we can't easily build an all zero vector, just return
2957 return getConstant(APInt::getAllOnesValue(VT.getSizeInBits()), VT);
2958 // For vectors, we can't easily build an all one vector, just return
2966 // Memoize this node if possible.
2968 SDVTList VTs = getVTList(VT);
2969 if (VT != MVT::Flag) {
2970 SDValue Ops[] = { N1, N2 };
2971 FoldingSetNodeID ID;
2972 AddNodeIDNode(ID, Opcode, VTs, Ops, 2);
2974 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
2975 return SDValue(E, 0);
2977 N = new (NodeAllocator) BinarySDNode(Opcode, DL, VTs, N1, N2);
2978 CSEMap.InsertNode(N, IP);
2980 N = new (NodeAllocator) BinarySDNode(Opcode, DL, VTs, N1, N2);
2983 AllNodes.push_back(N);
2987 return SDValue(N, 0);
2990 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT,
2991 SDValue N1, SDValue N2, SDValue N3) {
2992 // Perform various simplifications.
2993 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.getNode());
2994 ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.getNode());
2996 case ISD::CONCAT_VECTORS:
2997 // A CONCAT_VECTOR with all operands BUILD_VECTOR can be simplified to
2998 // one big BUILD_VECTOR.
2999 if (N1.getOpcode() == ISD::BUILD_VECTOR &&
3000 N2.getOpcode() == ISD::BUILD_VECTOR &&
3001 N3.getOpcode() == ISD::BUILD_VECTOR) {
3002 SmallVector<SDValue, 16> Elts(N1.getNode()->op_begin(), N1.getNode()->op_end());
3003 Elts.insert(Elts.end(), N2.getNode()->op_begin(), N2.getNode()->op_end());
3004 Elts.insert(Elts.end(), N3.getNode()->op_begin(), N3.getNode()->op_end());
3005 return getNode(ISD::BUILD_VECTOR, DL, VT, &Elts[0], Elts.size());
3009 // Use FoldSetCC to simplify SETCC's.
3010 SDValue Simp = FoldSetCC(VT, N1, N2, cast<CondCodeSDNode>(N3)->get(), DL);
3011 if (Simp.getNode()) return Simp;
3016 if (N1C->getZExtValue())
3017 return N2; // select true, X, Y -> X
3019 return N3; // select false, X, Y -> Y
3022 if (N2 == N3) return N2; // select C, X, X -> X
3026 if (N2C->getZExtValue()) // Unconditional branch
3027 return getNode(ISD::BR, DL, MVT::Other, N1, N3);
3029 return N1; // Never-taken branch
3032 case ISD::VECTOR_SHUFFLE:
3033 llvm_unreachable("should use getVectorShuffle constructor!");
3035 case ISD::BIT_CONVERT:
3036 // Fold bit_convert nodes from a type to themselves.
3037 if (N1.getValueType() == VT)
3042 // Memoize node if it doesn't produce a flag.
3044 SDVTList VTs = getVTList(VT);
3045 if (VT != MVT::Flag) {
3046 SDValue Ops[] = { N1, N2, N3 };
3047 FoldingSetNodeID ID;
3048 AddNodeIDNode(ID, Opcode, VTs, Ops, 3);
3050 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
3051 return SDValue(E, 0);
3053 N = new (NodeAllocator) TernarySDNode(Opcode, DL, VTs, N1, N2, N3);
3054 CSEMap.InsertNode(N, IP);
3056 N = new (NodeAllocator) TernarySDNode(Opcode, DL, VTs, N1, N2, N3);
3059 AllNodes.push_back(N);
3063 return SDValue(N, 0);
3066 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT,
3067 SDValue N1, SDValue N2, SDValue N3,
3069 SDValue Ops[] = { N1, N2, N3, N4 };
3070 return getNode(Opcode, DL, VT, Ops, 4);
3073 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT,
3074 SDValue N1, SDValue N2, SDValue N3,
3075 SDValue N4, SDValue N5) {
3076 SDValue Ops[] = { N1, N2, N3, N4, N5 };
3077 return getNode(Opcode, DL, VT, Ops, 5);
3080 /// getStackArgumentTokenFactor - Compute a TokenFactor to force all
3081 /// the incoming stack arguments to be loaded from the stack.
3082 SDValue SelectionDAG::getStackArgumentTokenFactor(SDValue Chain) {
3083 SmallVector<SDValue, 8> ArgChains;
3085 // Include the original chain at the beginning of the list. When this is
3086 // used by target LowerCall hooks, this helps legalize find the
3087 // CALLSEQ_BEGIN node.
3088 ArgChains.push_back(Chain);
3090 // Add a chain value for each stack argument.
3091 for (SDNode::use_iterator U = getEntryNode().getNode()->use_begin(),
3092 UE = getEntryNode().getNode()->use_end(); U != UE; ++U)
3093 if (LoadSDNode *L = dyn_cast<LoadSDNode>(*U))
3094 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(L->getBasePtr()))
3095 if (FI->getIndex() < 0)
3096 ArgChains.push_back(SDValue(L, 1));
3098 // Build a tokenfactor for all the chains.
3099 return getNode(ISD::TokenFactor, Chain.getDebugLoc(), MVT::Other,
3100 &ArgChains[0], ArgChains.size());
3103 /// getMemsetValue - Vectorized representation of the memset value
3105 static SDValue getMemsetValue(SDValue Value, EVT VT, SelectionDAG &DAG,
3107 assert(Value.getOpcode() != ISD::UNDEF);
3109 unsigned NumBits = VT.getScalarType().getSizeInBits();
3110 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Value)) {
3111 APInt Val = APInt(NumBits, C->getZExtValue() & 255);
3113 for (unsigned i = NumBits; i > 8; i >>= 1) {
3114 Val = (Val << Shift) | Val;
3118 return DAG.getConstant(Val, VT);
3119 return DAG.getConstantFP(APFloat(Val), VT);
3122 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
3123 Value = DAG.getNode(ISD::ZERO_EXTEND, dl, VT, Value);
3125 for (unsigned i = NumBits; i > 8; i >>= 1) {
3126 Value = DAG.getNode(ISD::OR, dl, VT,
3127 DAG.getNode(ISD::SHL, dl, VT, Value,
3128 DAG.getConstant(Shift,
3129 TLI.getShiftAmountTy())),
3137 /// getMemsetStringVal - Similar to getMemsetValue. Except this is only
3138 /// used when a memcpy is turned into a memset when the source is a constant
3140 static SDValue getMemsetStringVal(EVT VT, DebugLoc dl, SelectionDAG &DAG,
3141 const TargetLowering &TLI,
3142 std::string &Str, unsigned Offset) {
3143 // Handle vector with all elements zero.
3146 return DAG.getConstant(0, VT);
3147 else if (VT.getSimpleVT().SimpleTy == MVT::f32 ||
3148 VT.getSimpleVT().SimpleTy == MVT::f64)
3149 return DAG.getConstantFP(0.0, VT);
3150 else if (VT.isVector()) {
3151 unsigned NumElts = VT.getVectorNumElements();
3152 MVT EltVT = (VT.getVectorElementType() == MVT::f32) ? MVT::i32 : MVT::i64;
3153 return DAG.getNode(ISD::BIT_CONVERT, dl, VT,
3154 DAG.getConstant(0, EVT::getVectorVT(*DAG.getContext(),
3157 llvm_unreachable("Expected type!");
3160 assert(!VT.isVector() && "Can't handle vector type here!");
3161 unsigned NumBits = VT.getSizeInBits();
3162 unsigned MSB = NumBits / 8;
3164 if (TLI.isLittleEndian())
3165 Offset = Offset + MSB - 1;
3166 for (unsigned i = 0; i != MSB; ++i) {
3167 Val = (Val << 8) | (unsigned char)Str[Offset];
3168 Offset += TLI.isLittleEndian() ? -1 : 1;
3170 return DAG.getConstant(Val, VT);
3173 /// getMemBasePlusOffset - Returns base and offset node for the
3175 static SDValue getMemBasePlusOffset(SDValue Base, unsigned Offset,
3176 SelectionDAG &DAG) {
3177 EVT VT = Base.getValueType();
3178 return DAG.getNode(ISD::ADD, Base.getDebugLoc(),
3179 VT, Base, DAG.getConstant(Offset, VT));
3182 /// isMemSrcFromString - Returns true if memcpy source is a string constant.
3184 static bool isMemSrcFromString(SDValue Src, std::string &Str) {
3185 unsigned SrcDelta = 0;
3186 GlobalAddressSDNode *G = NULL;
3187 if (Src.getOpcode() == ISD::GlobalAddress)
3188 G = cast<GlobalAddressSDNode>(Src);
3189 else if (Src.getOpcode() == ISD::ADD &&
3190 Src.getOperand(0).getOpcode() == ISD::GlobalAddress &&
3191 Src.getOperand(1).getOpcode() == ISD::Constant) {
3192 G = cast<GlobalAddressSDNode>(Src.getOperand(0));
3193 SrcDelta = cast<ConstantSDNode>(Src.getOperand(1))->getZExtValue();
3198 GlobalVariable *GV = dyn_cast<GlobalVariable>(G->getGlobal());
3199 if (GV && GetConstantStringInfo(GV, Str, SrcDelta, false))
3205 /// FindOptimalMemOpLowering - Determines the optimial series memory ops
3206 /// to replace the memset / memcpy. Return true if the number of memory ops
3207 /// is below the threshold. It returns the types of the sequence of
3208 /// memory ops to perform memset / memcpy by reference.
3209 static bool FindOptimalMemOpLowering(std::vector<EVT> &MemOps,
3210 unsigned Limit, uint64_t Size,
3211 unsigned DstAlign, unsigned SrcAlign,
3212 bool NonScalarIntSafe,
3215 const TargetLowering &TLI) {
3216 assert((SrcAlign == 0 || SrcAlign >= DstAlign) &&
3217 "Expecting memcpy / memset source to meet alignment requirement!");
3218 // If 'SrcAlign' is zero, that means the memory operation does not need load
3219 // the value, i.e. memset or memcpy from constant string. Otherwise, it's
3220 // the inferred alignment of the source. 'DstAlign', on the other hand, is the
3221 // specified alignment of the memory operation. If it is zero, that means
3222 // it's possible to change the alignment of the destination. 'MemcpyStrSrc'
3223 // indicates whether the memcpy source is constant so it does not need to be
3225 EVT VT = TLI.getOptimalMemOpType(Size, DstAlign, SrcAlign,
3226 NonScalarIntSafe, MemcpyStrSrc, DAG);
3228 if (VT == MVT::Other) {
3229 if (DstAlign >= TLI.getTargetData()->getPointerPrefAlignment() ||
3230 TLI.allowsUnalignedMemoryAccesses(VT)) {
3231 VT = TLI.getPointerTy();
3233 switch (DstAlign & 7) {
3234 case 0: VT = MVT::i64; break;
3235 case 4: VT = MVT::i32; break;
3236 case 2: VT = MVT::i16; break;
3237 default: VT = MVT::i8; break;
3242 while (!TLI.isTypeLegal(LVT))
3243 LVT = (MVT::SimpleValueType)(LVT.SimpleTy - 1);
3244 assert(LVT.isInteger());
3250 unsigned NumMemOps = 0;
3252 unsigned VTSize = VT.getSizeInBits() / 8;
3253 while (VTSize > Size) {
3254 // For now, only use non-vector load / store's for the left-over pieces.
3255 if (VT.isVector() || VT.isFloatingPoint()) {
3257 while (!TLI.isTypeLegal(VT))
3258 VT = (MVT::SimpleValueType)(VT.getSimpleVT().SimpleTy - 1);
3259 VTSize = VT.getSizeInBits() / 8;
3261 // This can result in a type that is not legal on the target, e.g.
3262 // 1 or 2 bytes on PPC.
3263 VT = (MVT::SimpleValueType)(VT.getSimpleVT().SimpleTy - 1);
3268 if (++NumMemOps > Limit)
3270 MemOps.push_back(VT);
3277 static SDValue getMemcpyLoadsAndStores(SelectionDAG &DAG, DebugLoc dl,
3278 SDValue Chain, SDValue Dst,
3279 SDValue Src, uint64_t Size,
3280 unsigned Align, bool isVol,
3282 const Value *DstSV, uint64_t DstSVOff,
3283 const Value *SrcSV, uint64_t SrcSVOff) {
3284 // Turn a memcpy of undef to nop.
3285 if (Src.getOpcode() == ISD::UNDEF)
3288 // Expand memcpy to a series of load and store ops if the size operand falls
3289 // below a certain threshold.
3290 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
3291 std::vector<EVT> MemOps;
3292 bool DstAlignCanChange = false;
3293 MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
3294 FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Dst);
3295 if (FI && !MFI->isFixedObjectIndex(FI->getIndex()))
3296 DstAlignCanChange = true;
3297 unsigned SrcAlign = DAG.InferPtrAlignment(Src);
3298 if (Align > SrcAlign)
3301 bool CopyFromStr = isMemSrcFromString(Src, Str);
3302 bool isZeroStr = CopyFromStr && Str.empty();
3303 uint64_t Limit = -1ULL;
3305 Limit = TLI.getMaxStoresPerMemcpy();
3306 if (!FindOptimalMemOpLowering(MemOps, Limit, Size,
3307 (DstAlignCanChange ? 0 : Align),
3308 (isZeroStr ? 0 : SrcAlign),
3309 true, CopyFromStr, DAG, TLI))
3312 if (DstAlignCanChange) {
3313 const Type *Ty = MemOps[0].getTypeForEVT(*DAG.getContext());
3314 unsigned NewAlign = (unsigned) TLI.getTargetData()->getABITypeAlignment(Ty);
3315 if (NewAlign > Align) {
3316 // Give the stack frame object a larger alignment if needed.
3317 if (MFI->getObjectAlignment(FI->getIndex()) < NewAlign)
3318 MFI->setObjectAlignment(FI->getIndex(), NewAlign);
3323 SmallVector<SDValue, 8> OutChains;
3324 unsigned NumMemOps = MemOps.size();
3325 uint64_t SrcOff = 0, DstOff = 0;
3326 for (unsigned i = 0; i != NumMemOps; ++i) {
3328 unsigned VTSize = VT.getSizeInBits() / 8;
3329 SDValue Value, Store;
3332 (isZeroStr || (VT.isInteger() && !VT.isVector()))) {
3333 // It's unlikely a store of a vector immediate can be done in a single
3334 // instruction. It would require a load from a constantpool first.
3335 // We only handle zero vectors here.
3336 // FIXME: Handle other cases where store of vector immediate is done in
3337 // a single instruction.
3338 Value = getMemsetStringVal(VT, dl, DAG, TLI, Str, SrcOff);
3339 Store = DAG.getStore(Chain, dl, Value,
3340 getMemBasePlusOffset(Dst, DstOff, DAG),
3341 DstSV, DstSVOff + DstOff, isVol, false, Align);
3343 // The type might not be legal for the target. This should only happen
3344 // if the type is smaller than a legal type, as on PPC, so the right
3345 // thing to do is generate a LoadExt/StoreTrunc pair. These simplify
3346 // to Load/Store if NVT==VT.
3347 // FIXME does the case above also need this?
3348 EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), VT);
3349 assert(NVT.bitsGE(VT));
3350 Value = DAG.getExtLoad(ISD::EXTLOAD, dl, NVT, Chain,
3351 getMemBasePlusOffset(Src, SrcOff, DAG),
3352 SrcSV, SrcSVOff + SrcOff, VT, isVol, false,
3353 MinAlign(SrcAlign, SrcOff));
3354 Store = DAG.getTruncStore(Chain, dl, Value,
3355 getMemBasePlusOffset(Dst, DstOff, DAG),
3356 DstSV, DstSVOff + DstOff, VT, isVol, false,
3359 OutChains.push_back(Store);
3364 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
3365 &OutChains[0], OutChains.size());
3368 static SDValue getMemmoveLoadsAndStores(SelectionDAG &DAG, DebugLoc dl,
3369 SDValue Chain, SDValue Dst,
3370 SDValue Src, uint64_t Size,
3371 unsigned Align, bool isVol,
3373 const Value *DstSV, uint64_t DstSVOff,
3374 const Value *SrcSV, uint64_t SrcSVOff) {
3375 // Turn a memmove of undef to nop.
3376 if (Src.getOpcode() == ISD::UNDEF)
3379 // Expand memmove to a series of load and store ops if the size operand falls
3380 // below a certain threshold.
3381 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
3382 std::vector<EVT> MemOps;
3383 uint64_t Limit = -1ULL;
3385 Limit = TLI.getMaxStoresPerMemmove();
3386 bool DstAlignCanChange = false;
3387 MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
3388 FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Dst);
3389 if (FI && !MFI->isFixedObjectIndex(FI->getIndex()))
3390 DstAlignCanChange = true;
3391 unsigned SrcAlign = DAG.InferPtrAlignment(Src);
3392 if (Align > SrcAlign)
3395 if (!FindOptimalMemOpLowering(MemOps, Limit, Size,
3396 (DstAlignCanChange ? 0 : Align),
3397 SrcAlign, true, false, DAG, TLI))
3400 if (DstAlignCanChange) {
3401 const Type *Ty = MemOps[0].getTypeForEVT(*DAG.getContext());
3402 unsigned NewAlign = (unsigned) TLI.getTargetData()->getABITypeAlignment(Ty);
3403 if (NewAlign > Align) {
3404 // Give the stack frame object a larger alignment if needed.
3405 if (MFI->getObjectAlignment(FI->getIndex()) < NewAlign)
3406 MFI->setObjectAlignment(FI->getIndex(), NewAlign);
3411 uint64_t SrcOff = 0, DstOff = 0;
3412 SmallVector<SDValue, 8> LoadValues;
3413 SmallVector<SDValue, 8> LoadChains;
3414 SmallVector<SDValue, 8> OutChains;
3415 unsigned NumMemOps = MemOps.size();
3416 for (unsigned i = 0; i < NumMemOps; i++) {
3418 unsigned VTSize = VT.getSizeInBits() / 8;
3419 SDValue Value, Store;
3421 Value = DAG.getLoad(VT, dl, Chain,
3422 getMemBasePlusOffset(Src, SrcOff, DAG),
3423 SrcSV, SrcSVOff + SrcOff, isVol, false, SrcAlign);
3424 LoadValues.push_back(Value);
3425 LoadChains.push_back(Value.getValue(1));
3428 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
3429 &LoadChains[0], LoadChains.size());
3431 for (unsigned i = 0; i < NumMemOps; i++) {
3433 unsigned VTSize = VT.getSizeInBits() / 8;
3434 SDValue Value, Store;
3436 Store = DAG.getStore(Chain, dl, LoadValues[i],
3437 getMemBasePlusOffset(Dst, DstOff, DAG),
3438 DstSV, DstSVOff + DstOff, isVol, false, Align);
3439 OutChains.push_back(Store);
3443 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
3444 &OutChains[0], OutChains.size());
3447 static SDValue getMemsetStores(SelectionDAG &DAG, DebugLoc dl,
3448 SDValue Chain, SDValue Dst,
3449 SDValue Src, uint64_t Size,
3450 unsigned Align, bool isVol,
3451 const Value *DstSV, uint64_t DstSVOff) {
3452 // Turn a memset of undef to nop.
3453 if (Src.getOpcode() == ISD::UNDEF)
3456 // Expand memset to a series of load/store ops if the size operand
3457 // falls below a certain threshold.
3458 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
3459 std::vector<EVT> MemOps;
3460 bool DstAlignCanChange = false;
3461 MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
3462 FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Dst);
3463 if (FI && !MFI->isFixedObjectIndex(FI->getIndex()))
3464 DstAlignCanChange = true;
3465 bool NonScalarIntSafe =
3466 isa<ConstantSDNode>(Src) && cast<ConstantSDNode>(Src)->isNullValue();
3467 if (!FindOptimalMemOpLowering(MemOps, TLI.getMaxStoresPerMemset(),
3468 Size, (DstAlignCanChange ? 0 : Align), 0,
3469 NonScalarIntSafe, false, DAG, TLI))
3472 if (DstAlignCanChange) {
3473 const Type *Ty = MemOps[0].getTypeForEVT(*DAG.getContext());
3474 unsigned NewAlign = (unsigned) TLI.getTargetData()->getABITypeAlignment(Ty);
3475 if (NewAlign > Align) {
3476 // Give the stack frame object a larger alignment if needed.
3477 if (MFI->getObjectAlignment(FI->getIndex()) < NewAlign)
3478 MFI->setObjectAlignment(FI->getIndex(), NewAlign);
3483 SmallVector<SDValue, 8> OutChains;
3484 uint64_t DstOff = 0;
3485 unsigned NumMemOps = MemOps.size();
3486 for (unsigned i = 0; i < NumMemOps; i++) {
3488 unsigned VTSize = VT.getSizeInBits() / 8;
3489 SDValue Value = getMemsetValue(Src, VT, DAG, dl);
3490 SDValue Store = DAG.getStore(Chain, dl, Value,
3491 getMemBasePlusOffset(Dst, DstOff, DAG),
3492 DstSV, DstSVOff + DstOff, isVol, false, 0);
3493 OutChains.push_back(Store);
3497 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
3498 &OutChains[0], OutChains.size());
3501 SDValue SelectionDAG::getMemcpy(SDValue Chain, DebugLoc dl, SDValue Dst,
3502 SDValue Src, SDValue Size,
3503 unsigned Align, bool isVol, bool AlwaysInline,
3504 const Value *DstSV, uint64_t DstSVOff,
3505 const Value *SrcSV, uint64_t SrcSVOff) {
3507 // Check to see if we should lower the memcpy to loads and stores first.
3508 // For cases within the target-specified limits, this is the best choice.
3509 ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size);
3511 // Memcpy with size zero? Just return the original chain.
3512 if (ConstantSize->isNullValue())
3515 SDValue Result = getMemcpyLoadsAndStores(*this, dl, Chain, Dst, Src,
3516 ConstantSize->getZExtValue(),Align,
3517 isVol, false, DstSV, DstSVOff, SrcSV, SrcSVOff);
3518 if (Result.getNode())
3522 // Then check to see if we should lower the memcpy with target-specific
3523 // code. If the target chooses to do this, this is the next best.
3525 TLI.EmitTargetCodeForMemcpy(*this, dl, Chain, Dst, Src, Size, Align,
3526 isVol, AlwaysInline,
3527 DstSV, DstSVOff, SrcSV, SrcSVOff);
3528 if (Result.getNode())
3531 // If we really need inline code and the target declined to provide it,
3532 // use a (potentially long) sequence of loads and stores.
3534 assert(ConstantSize && "AlwaysInline requires a constant size!");
3535 return getMemcpyLoadsAndStores(*this, dl, Chain, Dst, Src,
3536 ConstantSize->getZExtValue(), Align, isVol,
3537 true, DstSV, DstSVOff, SrcSV, SrcSVOff);
3540 // FIXME: If the memcpy is volatile (isVol), lowering it to a plain libc
3541 // memcpy is not guaranteed to be safe. libc memcpys aren't required to
3542 // respect volatile, so they may do things like read or write memory
3543 // beyond the given memory regions. But fixing this isn't easy, and most
3544 // people don't care.
3546 // Emit a library call.
3547 TargetLowering::ArgListTy Args;
3548 TargetLowering::ArgListEntry Entry;
3549 Entry.Ty = TLI.getTargetData()->getIntPtrType(*getContext());
3550 Entry.Node = Dst; Args.push_back(Entry);
3551 Entry.Node = Src; Args.push_back(Entry);
3552 Entry.Node = Size; Args.push_back(Entry);
3553 // FIXME: pass in DebugLoc
3554 std::pair<SDValue,SDValue> CallResult =
3555 TLI.LowerCallTo(Chain, Type::getVoidTy(*getContext()),
3556 false, false, false, false, 0,
3557 TLI.getLibcallCallingConv(RTLIB::MEMCPY), false,
3558 /*isReturnValueUsed=*/false,
3559 getExternalSymbol(TLI.getLibcallName(RTLIB::MEMCPY),
3560 TLI.getPointerTy()),
3562 return CallResult.second;
3565 SDValue SelectionDAG::getMemmove(SDValue Chain, DebugLoc dl, SDValue Dst,
3566 SDValue Src, SDValue Size,
3567 unsigned Align, bool isVol,
3568 const Value *DstSV, uint64_t DstSVOff,
3569 const Value *SrcSV, uint64_t SrcSVOff) {
3571 // Check to see if we should lower the memmove to loads and stores first.
3572 // For cases within the target-specified limits, this is the best choice.
3573 ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size);
3575 // Memmove with size zero? Just return the original chain.
3576 if (ConstantSize->isNullValue())
3580 getMemmoveLoadsAndStores(*this, dl, Chain, Dst, Src,
3581 ConstantSize->getZExtValue(), Align, isVol,
3582 false, DstSV, DstSVOff, SrcSV, SrcSVOff);
3583 if (Result.getNode())
3587 // Then check to see if we should lower the memmove with target-specific
3588 // code. If the target chooses to do this, this is the next best.
3590 TLI.EmitTargetCodeForMemmove(*this, dl, Chain, Dst, Src, Size, Align, isVol,
3591 DstSV, DstSVOff, SrcSV, SrcSVOff);
3592 if (Result.getNode())
3595 // FIXME: If the memmove is volatile, lowering it to plain libc memmove may
3596 // not be safe. See memcpy above for more details.
3598 // Emit a library call.
3599 TargetLowering::ArgListTy Args;
3600 TargetLowering::ArgListEntry Entry;
3601 Entry.Ty = TLI.getTargetData()->getIntPtrType(*getContext());
3602 Entry.Node = Dst; Args.push_back(Entry);
3603 Entry.Node = Src; Args.push_back(Entry);
3604 Entry.Node = Size; Args.push_back(Entry);
3605 // FIXME: pass in DebugLoc
3606 std::pair<SDValue,SDValue> CallResult =
3607 TLI.LowerCallTo(Chain, Type::getVoidTy(*getContext()),
3608 false, false, false, false, 0,
3609 TLI.getLibcallCallingConv(RTLIB::MEMMOVE), false,
3610 /*isReturnValueUsed=*/false,
3611 getExternalSymbol(TLI.getLibcallName(RTLIB::MEMMOVE),
3612 TLI.getPointerTy()),
3614 return CallResult.second;
3617 SDValue SelectionDAG::getMemset(SDValue Chain, DebugLoc dl, SDValue Dst,
3618 SDValue Src, SDValue Size,
3619 unsigned Align, bool isVol,
3620 const Value *DstSV, uint64_t DstSVOff) {
3622 // Check to see if we should lower the memset to stores first.
3623 // For cases within the target-specified limits, this is the best choice.
3624 ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size);
3626 // Memset with size zero? Just return the original chain.
3627 if (ConstantSize->isNullValue())
3631 getMemsetStores(*this, dl, Chain, Dst, Src, ConstantSize->getZExtValue(),
3632 Align, isVol, DstSV, DstSVOff);
3634 if (Result.getNode())
3638 // Then check to see if we should lower the memset with target-specific
3639 // code. If the target chooses to do this, this is the next best.
3641 TLI.EmitTargetCodeForMemset(*this, dl, Chain, Dst, Src, Size, Align, isVol,
3643 if (Result.getNode())
3646 // Emit a library call.
3647 const Type *IntPtrTy = TLI.getTargetData()->getIntPtrType(*getContext());
3648 TargetLowering::ArgListTy Args;
3649 TargetLowering::ArgListEntry Entry;
3650 Entry.Node = Dst; Entry.Ty = IntPtrTy;
3651 Args.push_back(Entry);
3652 // Extend or truncate the argument to be an i32 value for the call.
3653 if (Src.getValueType().bitsGT(MVT::i32))
3654 Src = getNode(ISD::TRUNCATE, dl, MVT::i32, Src);
3656 Src = getNode(ISD::ZERO_EXTEND, dl, MVT::i32, Src);
3658 Entry.Ty = Type::getInt32Ty(*getContext());
3659 Entry.isSExt = true;
3660 Args.push_back(Entry);
3662 Entry.Ty = IntPtrTy;
3663 Entry.isSExt = false;
3664 Args.push_back(Entry);
3665 // FIXME: pass in DebugLoc
3666 std::pair<SDValue,SDValue> CallResult =
3667 TLI.LowerCallTo(Chain, Type::getVoidTy(*getContext()),
3668 false, false, false, false, 0,
3669 TLI.getLibcallCallingConv(RTLIB::MEMSET), false,
3670 /*isReturnValueUsed=*/false,
3671 getExternalSymbol(TLI.getLibcallName(RTLIB::MEMSET),
3672 TLI.getPointerTy()),
3674 return CallResult.second;
3677 SDValue SelectionDAG::getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT,
3679 SDValue Ptr, SDValue Cmp,
3680 SDValue Swp, const Value* PtrVal,
3681 unsigned Alignment) {
3682 if (Alignment == 0) // Ensure that codegen never sees alignment 0
3683 Alignment = getEVTAlignment(MemVT);
3685 // Check if the memory reference references a frame index
3687 if (const FrameIndexSDNode *FI =
3688 dyn_cast<const FrameIndexSDNode>(Ptr.getNode()))
3689 PtrVal = PseudoSourceValue::getFixedStack(FI->getIndex());
3691 MachineFunction &MF = getMachineFunction();
3692 unsigned Flags = MachineMemOperand::MOLoad | MachineMemOperand::MOStore;
3694 // For now, atomics are considered to be volatile always.
3695 Flags |= MachineMemOperand::MOVolatile;
3697 MachineMemOperand *MMO =
3698 MF.getMachineMemOperand(PtrVal, Flags, 0,
3699 MemVT.getStoreSize(), Alignment);
3701 return getAtomic(Opcode, dl, MemVT, Chain, Ptr, Cmp, Swp, MMO);
3704 SDValue SelectionDAG::getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT,
3706 SDValue Ptr, SDValue Cmp,
3707 SDValue Swp, MachineMemOperand *MMO) {
3708 assert(Opcode == ISD::ATOMIC_CMP_SWAP && "Invalid Atomic Op");
3709 assert(Cmp.getValueType() == Swp.getValueType() && "Invalid Atomic Op Types");
3711 EVT VT = Cmp.getValueType();
3713 SDVTList VTs = getVTList(VT, MVT::Other);
3714 FoldingSetNodeID ID;
3715 ID.AddInteger(MemVT.getRawBits());
3716 SDValue Ops[] = {Chain, Ptr, Cmp, Swp};
3717 AddNodeIDNode(ID, Opcode, VTs, Ops, 4);
3719 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) {
3720 cast<AtomicSDNode>(E)->refineAlignment(MMO);
3721 return SDValue(E, 0);
3723 SDNode *N = new (NodeAllocator) AtomicSDNode(Opcode, dl, VTs, MemVT, Chain,
3724 Ptr, Cmp, Swp, MMO);
3725 CSEMap.InsertNode(N, IP);
3726 AllNodes.push_back(N);
3727 return SDValue(N, 0);
3730 SDValue SelectionDAG::getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT,
3732 SDValue Ptr, SDValue Val,
3733 const Value* PtrVal,
3734 unsigned Alignment) {
3735 if (Alignment == 0) // Ensure that codegen never sees alignment 0
3736 Alignment = getEVTAlignment(MemVT);
3738 // Check if the memory reference references a frame index
3740 if (const FrameIndexSDNode *FI =
3741 dyn_cast<const FrameIndexSDNode>(Ptr.getNode()))
3742 PtrVal = PseudoSourceValue::getFixedStack(FI->getIndex());
3744 MachineFunction &MF = getMachineFunction();
3745 unsigned Flags = MachineMemOperand::MOLoad | MachineMemOperand::MOStore;
3747 // For now, atomics are considered to be volatile always.
3748 Flags |= MachineMemOperand::MOVolatile;
3750 MachineMemOperand *MMO =
3751 MF.getMachineMemOperand(PtrVal, Flags, 0,
3752 MemVT.getStoreSize(), Alignment);
3754 return getAtomic(Opcode, dl, MemVT, Chain, Ptr, Val, MMO);
3757 SDValue SelectionDAG::getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT,
3759 SDValue Ptr, SDValue Val,
3760 MachineMemOperand *MMO) {
3761 assert((Opcode == ISD::ATOMIC_LOAD_ADD ||
3762 Opcode == ISD::ATOMIC_LOAD_SUB ||
3763 Opcode == ISD::ATOMIC_LOAD_AND ||
3764 Opcode == ISD::ATOMIC_LOAD_OR ||
3765 Opcode == ISD::ATOMIC_LOAD_XOR ||
3766 Opcode == ISD::ATOMIC_LOAD_NAND ||
3767 Opcode == ISD::ATOMIC_LOAD_MIN ||
3768 Opcode == ISD::ATOMIC_LOAD_MAX ||
3769 Opcode == ISD::ATOMIC_LOAD_UMIN ||
3770 Opcode == ISD::ATOMIC_LOAD_UMAX ||
3771 Opcode == ISD::ATOMIC_SWAP) &&
3772 "Invalid Atomic Op");
3774 EVT VT = Val.getValueType();
3776 SDVTList VTs = getVTList(VT, MVT::Other);
3777 FoldingSetNodeID ID;
3778 ID.AddInteger(MemVT.getRawBits());
3779 SDValue Ops[] = {Chain, Ptr, Val};
3780 AddNodeIDNode(ID, Opcode, VTs, Ops, 3);
3782 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) {
3783 cast<AtomicSDNode>(E)->refineAlignment(MMO);
3784 return SDValue(E, 0);
3786 SDNode *N = new (NodeAllocator) AtomicSDNode(Opcode, dl, VTs, MemVT, Chain,
3788 CSEMap.InsertNode(N, IP);
3789 AllNodes.push_back(N);
3790 return SDValue(N, 0);
3793 /// getMergeValues - Create a MERGE_VALUES node from the given operands.
3794 /// Allowed to return something different (and simpler) if Simplify is true.
3795 SDValue SelectionDAG::getMergeValues(const SDValue *Ops, unsigned NumOps,
3800 SmallVector<EVT, 4> VTs;
3801 VTs.reserve(NumOps);
3802 for (unsigned i = 0; i < NumOps; ++i)
3803 VTs.push_back(Ops[i].getValueType());
3804 return getNode(ISD::MERGE_VALUES, dl, getVTList(&VTs[0], NumOps),
3809 SelectionDAG::getMemIntrinsicNode(unsigned Opcode, DebugLoc dl,
3810 const EVT *VTs, unsigned NumVTs,
3811 const SDValue *Ops, unsigned NumOps,
3812 EVT MemVT, const Value *srcValue, int SVOff,
3813 unsigned Align, bool Vol,
3814 bool ReadMem, bool WriteMem) {
3815 return getMemIntrinsicNode(Opcode, dl, makeVTList(VTs, NumVTs), Ops, NumOps,
3816 MemVT, srcValue, SVOff, Align, Vol,
3821 SelectionDAG::getMemIntrinsicNode(unsigned Opcode, DebugLoc dl, SDVTList VTList,
3822 const SDValue *Ops, unsigned NumOps,
3823 EVT MemVT, const Value *srcValue, int SVOff,
3824 unsigned Align, bool Vol,
3825 bool ReadMem, bool WriteMem) {
3826 if (Align == 0) // Ensure that codegen never sees alignment 0
3827 Align = getEVTAlignment(MemVT);
3829 MachineFunction &MF = getMachineFunction();
3832 Flags |= MachineMemOperand::MOStore;
3834 Flags |= MachineMemOperand::MOLoad;
3836 Flags |= MachineMemOperand::MOVolatile;
3837 MachineMemOperand *MMO =
3838 MF.getMachineMemOperand(srcValue, Flags, SVOff,
3839 MemVT.getStoreSize(), Align);
3841 return getMemIntrinsicNode(Opcode, dl, VTList, Ops, NumOps, MemVT, MMO);
3845 SelectionDAG::getMemIntrinsicNode(unsigned Opcode, DebugLoc dl, SDVTList VTList,
3846 const SDValue *Ops, unsigned NumOps,
3847 EVT MemVT, MachineMemOperand *MMO) {
3848 assert((Opcode == ISD::INTRINSIC_VOID ||
3849 Opcode == ISD::INTRINSIC_W_CHAIN ||
3850 (Opcode <= INT_MAX &&
3851 (int)Opcode >= ISD::FIRST_TARGET_MEMORY_OPCODE)) &&
3852 "Opcode is not a memory-accessing opcode!");
3854 // Memoize the node unless it returns a flag.
3855 MemIntrinsicSDNode *N;
3856 if (VTList.VTs[VTList.NumVTs-1] != MVT::Flag) {
3857 FoldingSetNodeID ID;
3858 AddNodeIDNode(ID, Opcode, VTList, Ops, NumOps);
3860 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) {
3861 cast<MemIntrinsicSDNode>(E)->refineAlignment(MMO);
3862 return SDValue(E, 0);
3865 N = new (NodeAllocator) MemIntrinsicSDNode(Opcode, dl, VTList, Ops, NumOps,
3867 CSEMap.InsertNode(N, IP);
3869 N = new (NodeAllocator) MemIntrinsicSDNode(Opcode, dl, VTList, Ops, NumOps,
3872 AllNodes.push_back(N);
3873 return SDValue(N, 0);
3877 SelectionDAG::getLoad(ISD::MemIndexedMode AM, DebugLoc dl,
3878 ISD::LoadExtType ExtType, EVT VT, SDValue Chain,
3879 SDValue Ptr, SDValue Offset,
3880 const Value *SV, int SVOffset, EVT MemVT,
3881 bool isVolatile, bool isNonTemporal,
3882 unsigned Alignment) {
3883 if (Alignment == 0) // Ensure that codegen never sees alignment 0
3884 Alignment = getEVTAlignment(VT);
3886 // Check if the memory reference references a frame index
3888 if (const FrameIndexSDNode *FI =
3889 dyn_cast<const FrameIndexSDNode>(Ptr.getNode()))
3890 SV = PseudoSourceValue::getFixedStack(FI->getIndex());
3892 MachineFunction &MF = getMachineFunction();
3893 unsigned Flags = MachineMemOperand::MOLoad;
3895 Flags |= MachineMemOperand::MOVolatile;
3897 Flags |= MachineMemOperand::MONonTemporal;
3898 MachineMemOperand *MMO =
3899 MF.getMachineMemOperand(SV, Flags, SVOffset,
3900 MemVT.getStoreSize(), Alignment);
3901 return getLoad(AM, dl, ExtType, VT, Chain, Ptr, Offset, MemVT, MMO);
3905 SelectionDAG::getLoad(ISD::MemIndexedMode AM, DebugLoc dl,
3906 ISD::LoadExtType ExtType, EVT VT, SDValue Chain,
3907 SDValue Ptr, SDValue Offset, EVT MemVT,
3908 MachineMemOperand *MMO) {
3910 ExtType = ISD::NON_EXTLOAD;
3911 } else if (ExtType == ISD::NON_EXTLOAD) {
3912 assert(VT == MemVT && "Non-extending load from different memory type!");
3915 assert(MemVT.getScalarType().bitsLT(VT.getScalarType()) &&
3916 "Should only be an extending load, not truncating!");
3917 assert(VT.isInteger() == MemVT.isInteger() &&
3918 "Cannot convert from FP to Int or Int -> FP!");
3919 assert(VT.isVector() == MemVT.isVector() &&
3920 "Cannot use trunc store to convert to or from a vector!");
3921 assert((!VT.isVector() ||
3922 VT.getVectorNumElements() == MemVT.getVectorNumElements()) &&
3923 "Cannot use trunc store to change the number of vector elements!");
3926 bool Indexed = AM != ISD::UNINDEXED;
3927 assert((Indexed || Offset.getOpcode() == ISD::UNDEF) &&
3928 "Unindexed load with an offset!");
3930 SDVTList VTs = Indexed ?
3931 getVTList(VT, Ptr.getValueType(), MVT::Other) : getVTList(VT, MVT::Other);
3932 SDValue Ops[] = { Chain, Ptr, Offset };
3933 FoldingSetNodeID ID;
3934 AddNodeIDNode(ID, ISD::LOAD, VTs, Ops, 3);
3935 ID.AddInteger(MemVT.getRawBits());
3936 ID.AddInteger(encodeMemSDNodeFlags(ExtType, AM, MMO->isVolatile(),
3937 MMO->isNonTemporal()));
3939 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) {
3940 cast<LoadSDNode>(E)->refineAlignment(MMO);
3941 return SDValue(E, 0);
3943 SDNode *N = new (NodeAllocator) LoadSDNode(Ops, dl, VTs, AM, ExtType,
3945 CSEMap.InsertNode(N, IP);
3946 AllNodes.push_back(N);
3947 return SDValue(N, 0);
3950 SDValue SelectionDAG::getLoad(EVT VT, DebugLoc dl,
3951 SDValue Chain, SDValue Ptr,
3952 const Value *SV, int SVOffset,
3953 bool isVolatile, bool isNonTemporal,
3954 unsigned Alignment) {
3955 SDValue Undef = getUNDEF(Ptr.getValueType());
3956 return getLoad(ISD::UNINDEXED, dl, ISD::NON_EXTLOAD, VT, Chain, Ptr, Undef,
3957 SV, SVOffset, VT, isVolatile, isNonTemporal, Alignment);
3960 SDValue SelectionDAG::getExtLoad(ISD::LoadExtType ExtType, DebugLoc dl, EVT VT,
3961 SDValue Chain, SDValue Ptr,
3963 int SVOffset, EVT MemVT,
3964 bool isVolatile, bool isNonTemporal,
3965 unsigned Alignment) {
3966 SDValue Undef = getUNDEF(Ptr.getValueType());
3967 return getLoad(ISD::UNINDEXED, dl, ExtType, VT, Chain, Ptr, Undef,
3968 SV, SVOffset, MemVT, isVolatile, isNonTemporal, Alignment);
3972 SelectionDAG::getIndexedLoad(SDValue OrigLoad, DebugLoc dl, SDValue Base,
3973 SDValue Offset, ISD::MemIndexedMode AM) {
3974 LoadSDNode *LD = cast<LoadSDNode>(OrigLoad);
3975 assert(LD->getOffset().getOpcode() == ISD::UNDEF &&
3976 "Load is already a indexed load!");
3977 return getLoad(AM, dl, LD->getExtensionType(), OrigLoad.getValueType(),
3978 LD->getChain(), Base, Offset, LD->getSrcValue(),
3979 LD->getSrcValueOffset(), LD->getMemoryVT(),
3980 LD->isVolatile(), LD->isNonTemporal(), LD->getAlignment());
3983 SDValue SelectionDAG::getStore(SDValue Chain, DebugLoc dl, SDValue Val,
3984 SDValue Ptr, const Value *SV, int SVOffset,
3985 bool isVolatile, bool isNonTemporal,
3986 unsigned Alignment) {
3987 if (Alignment == 0) // Ensure that codegen never sees alignment 0
3988 Alignment = getEVTAlignment(Val.getValueType());
3990 // Check if the memory reference references a frame index
3992 if (const FrameIndexSDNode *FI =
3993 dyn_cast<const FrameIndexSDNode>(Ptr.getNode()))
3994 SV = PseudoSourceValue::getFixedStack(FI->getIndex());
3996 MachineFunction &MF = getMachineFunction();
3997 unsigned Flags = MachineMemOperand::MOStore;
3999 Flags |= MachineMemOperand::MOVolatile;
4001 Flags |= MachineMemOperand::MONonTemporal;
4002 MachineMemOperand *MMO =
4003 MF.getMachineMemOperand(SV, Flags, SVOffset,
4004 Val.getValueType().getStoreSize(), Alignment);
4006 return getStore(Chain, dl, Val, Ptr, MMO);
4009 SDValue SelectionDAG::getStore(SDValue Chain, DebugLoc dl, SDValue Val,
4010 SDValue Ptr, MachineMemOperand *MMO) {
4011 EVT VT = Val.getValueType();
4012 SDVTList VTs = getVTList(MVT::Other);
4013 SDValue Undef = getUNDEF(Ptr.getValueType());
4014 SDValue Ops[] = { Chain, Val, Ptr, Undef };
4015 FoldingSetNodeID ID;
4016 AddNodeIDNode(ID, ISD::STORE, VTs, Ops, 4);
4017 ID.AddInteger(VT.getRawBits());
4018 ID.AddInteger(encodeMemSDNodeFlags(false, ISD::UNINDEXED, MMO->isVolatile(),
4019 MMO->isNonTemporal()));
4021 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) {
4022 cast<StoreSDNode>(E)->refineAlignment(MMO);
4023 return SDValue(E, 0);
4025 SDNode *N = new (NodeAllocator) StoreSDNode(Ops, dl, VTs, ISD::UNINDEXED,
4027 CSEMap.InsertNode(N, IP);
4028 AllNodes.push_back(N);
4029 return SDValue(N, 0);
4032 SDValue SelectionDAG::getTruncStore(SDValue Chain, DebugLoc dl, SDValue Val,
4033 SDValue Ptr, const Value *SV,
4034 int SVOffset, EVT SVT,
4035 bool isVolatile, bool isNonTemporal,
4036 unsigned Alignment) {
4037 if (Alignment == 0) // Ensure that codegen never sees alignment 0
4038 Alignment = getEVTAlignment(SVT);
4040 // Check if the memory reference references a frame index
4042 if (const FrameIndexSDNode *FI =
4043 dyn_cast<const FrameIndexSDNode>(Ptr.getNode()))
4044 SV = PseudoSourceValue::getFixedStack(FI->getIndex());
4046 MachineFunction &MF = getMachineFunction();
4047 unsigned Flags = MachineMemOperand::MOStore;
4049 Flags |= MachineMemOperand::MOVolatile;
4051 Flags |= MachineMemOperand::MONonTemporal;
4052 MachineMemOperand *MMO =
4053 MF.getMachineMemOperand(SV, Flags, SVOffset, SVT.getStoreSize(), Alignment);
4055 return getTruncStore(Chain, dl, Val, Ptr, SVT, MMO);
4058 SDValue SelectionDAG::getTruncStore(SDValue Chain, DebugLoc dl, SDValue Val,
4059 SDValue Ptr, EVT SVT,
4060 MachineMemOperand *MMO) {
4061 EVT VT = Val.getValueType();
4064 return getStore(Chain, dl, Val, Ptr, MMO);
4066 assert(SVT.getScalarType().bitsLT(VT.getScalarType()) &&
4067 "Should only be a truncating store, not extending!");
4068 assert(VT.isInteger() == SVT.isInteger() &&
4069 "Can't do FP-INT conversion!");
4070 assert(VT.isVector() == SVT.isVector() &&
4071 "Cannot use trunc store to convert to or from a vector!");
4072 assert((!VT.isVector() ||
4073 VT.getVectorNumElements() == SVT.getVectorNumElements()) &&
4074 "Cannot use trunc store to change the number of vector elements!");
4076 SDVTList VTs = getVTList(MVT::Other);
4077 SDValue Undef = getUNDEF(Ptr.getValueType());
4078 SDValue Ops[] = { Chain, Val, Ptr, Undef };
4079 FoldingSetNodeID ID;
4080 AddNodeIDNode(ID, ISD::STORE, VTs, Ops, 4);
4081 ID.AddInteger(SVT.getRawBits());
4082 ID.AddInteger(encodeMemSDNodeFlags(true, ISD::UNINDEXED, MMO->isVolatile(),
4083 MMO->isNonTemporal()));
4085 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) {
4086 cast<StoreSDNode>(E)->refineAlignment(MMO);
4087 return SDValue(E, 0);
4089 SDNode *N = new (NodeAllocator) StoreSDNode(Ops, dl, VTs, ISD::UNINDEXED,
4091 CSEMap.InsertNode(N, IP);
4092 AllNodes.push_back(N);
4093 return SDValue(N, 0);
4097 SelectionDAG::getIndexedStore(SDValue OrigStore, DebugLoc dl, SDValue Base,
4098 SDValue Offset, ISD::MemIndexedMode AM) {
4099 StoreSDNode *ST = cast<StoreSDNode>(OrigStore);
4100 assert(ST->getOffset().getOpcode() == ISD::UNDEF &&
4101 "Store is already a indexed store!");
4102 SDVTList VTs = getVTList(Base.getValueType(), MVT::Other);
4103 SDValue Ops[] = { ST->getChain(), ST->getValue(), Base, Offset };
4104 FoldingSetNodeID ID;
4105 AddNodeIDNode(ID, ISD::STORE, VTs, Ops, 4);
4106 ID.AddInteger(ST->getMemoryVT().getRawBits());
4107 ID.AddInteger(ST->getRawSubclassData());
4109 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
4110 return SDValue(E, 0);
4112 SDNode *N = new (NodeAllocator) StoreSDNode(Ops, dl, VTs, AM,
4113 ST->isTruncatingStore(),
4115 ST->getMemOperand());
4116 CSEMap.InsertNode(N, IP);
4117 AllNodes.push_back(N);
4118 return SDValue(N, 0);
4121 SDValue SelectionDAG::getVAArg(EVT VT, DebugLoc dl,
4122 SDValue Chain, SDValue Ptr,
4124 SDValue Ops[] = { Chain, Ptr, SV };
4125 return getNode(ISD::VAARG, dl, getVTList(VT, MVT::Other), Ops, 3);
4128 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT,
4129 const SDUse *Ops, unsigned NumOps) {
4131 case 0: return getNode(Opcode, DL, VT);
4132 case 1: return getNode(Opcode, DL, VT, Ops[0]);
4133 case 2: return getNode(Opcode, DL, VT, Ops[0], Ops[1]);
4134 case 3: return getNode(Opcode, DL, VT, Ops[0], Ops[1], Ops[2]);
4138 // Copy from an SDUse array into an SDValue array for use with
4139 // the regular getNode logic.
4140 SmallVector<SDValue, 8> NewOps(Ops, Ops + NumOps);
4141 return getNode(Opcode, DL, VT, &NewOps[0], NumOps);
4144 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT,
4145 const SDValue *Ops, unsigned NumOps) {
4147 case 0: return getNode(Opcode, DL, VT);
4148 case 1: return getNode(Opcode, DL, VT, Ops[0]);
4149 case 2: return getNode(Opcode, DL, VT, Ops[0], Ops[1]);
4150 case 3: return getNode(Opcode, DL, VT, Ops[0], Ops[1], Ops[2]);
4156 case ISD::SELECT_CC: {
4157 assert(NumOps == 5 && "SELECT_CC takes 5 operands!");
4158 assert(Ops[0].getValueType() == Ops[1].getValueType() &&
4159 "LHS and RHS of condition must have same type!");
4160 assert(Ops[2].getValueType() == Ops[3].getValueType() &&
4161 "True and False arms of SelectCC must have same type!");
4162 assert(Ops[2].getValueType() == VT &&
4163 "select_cc node must be of same type as true and false value!");
4167 assert(NumOps == 5 && "BR_CC takes 5 operands!");
4168 assert(Ops[2].getValueType() == Ops[3].getValueType() &&
4169 "LHS/RHS of comparison should match types!");
4176 SDVTList VTs = getVTList(VT);
4178 if (VT != MVT::Flag) {
4179 FoldingSetNodeID ID;
4180 AddNodeIDNode(ID, Opcode, VTs, Ops, NumOps);
4183 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
4184 return SDValue(E, 0);
4186 N = new (NodeAllocator) SDNode(Opcode, DL, VTs, Ops, NumOps);
4187 CSEMap.InsertNode(N, IP);
4189 N = new (NodeAllocator) SDNode(Opcode, DL, VTs, Ops, NumOps);
4192 AllNodes.push_back(N);
4196 return SDValue(N, 0);
4199 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL,
4200 const std::vector<EVT> &ResultTys,
4201 const SDValue *Ops, unsigned NumOps) {
4202 return getNode(Opcode, DL, getVTList(&ResultTys[0], ResultTys.size()),
4206 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL,
4207 const EVT *VTs, unsigned NumVTs,
4208 const SDValue *Ops, unsigned NumOps) {
4210 return getNode(Opcode, DL, VTs[0], Ops, NumOps);
4211 return getNode(Opcode, DL, makeVTList(VTs, NumVTs), Ops, NumOps);
4214 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList,
4215 const SDValue *Ops, unsigned NumOps) {
4216 if (VTList.NumVTs == 1)
4217 return getNode(Opcode, DL, VTList.VTs[0], Ops, NumOps);
4221 // FIXME: figure out how to safely handle things like
4222 // int foo(int x) { return 1 << (x & 255); }
4223 // int bar() { return foo(256); }
4224 case ISD::SRA_PARTS:
4225 case ISD::SRL_PARTS:
4226 case ISD::SHL_PARTS:
4227 if (N3.getOpcode() == ISD::SIGN_EXTEND_INREG &&
4228 cast<VTSDNode>(N3.getOperand(1))->getVT() != MVT::i1)
4229 return getNode(Opcode, DL, VT, N1, N2, N3.getOperand(0));
4230 else if (N3.getOpcode() == ISD::AND)
4231 if (ConstantSDNode *AndRHS = dyn_cast<ConstantSDNode>(N3.getOperand(1))) {
4232 // If the and is only masking out bits that cannot effect the shift,
4233 // eliminate the and.
4234 unsigned NumBits = VT.getScalarType().getSizeInBits()*2;
4235 if ((AndRHS->getValue() & (NumBits-1)) == NumBits-1)
4236 return getNode(Opcode, DL, VT, N1, N2, N3.getOperand(0));
4242 // Memoize the node unless it returns a flag.
4244 if (VTList.VTs[VTList.NumVTs-1] != MVT::Flag) {
4245 FoldingSetNodeID ID;
4246 AddNodeIDNode(ID, Opcode, VTList, Ops, NumOps);
4248 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
4249 return SDValue(E, 0);
4252 N = new (NodeAllocator) UnarySDNode(Opcode, DL, VTList, Ops[0]);
4253 } else if (NumOps == 2) {
4254 N = new (NodeAllocator) BinarySDNode(Opcode, DL, VTList, Ops[0], Ops[1]);
4255 } else if (NumOps == 3) {
4256 N = new (NodeAllocator) TernarySDNode(Opcode, DL, VTList, Ops[0], Ops[1],
4259 N = new (NodeAllocator) SDNode(Opcode, DL, VTList, Ops, NumOps);
4261 CSEMap.InsertNode(N, IP);
4264 N = new (NodeAllocator) UnarySDNode(Opcode, DL, VTList, Ops[0]);
4265 } else if (NumOps == 2) {
4266 N = new (NodeAllocator) BinarySDNode(Opcode, DL, VTList, Ops[0], Ops[1]);
4267 } else if (NumOps == 3) {
4268 N = new (NodeAllocator) TernarySDNode(Opcode, DL, VTList, Ops[0], Ops[1],
4271 N = new (NodeAllocator) SDNode(Opcode, DL, VTList, Ops, NumOps);
4274 AllNodes.push_back(N);
4278 return SDValue(N, 0);
4281 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList) {
4282 return getNode(Opcode, DL, VTList, 0, 0);
4285 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList,
4287 SDValue Ops[] = { N1 };
4288 return getNode(Opcode, DL, VTList, Ops, 1);
4291 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList,
4292 SDValue N1, SDValue N2) {
4293 SDValue Ops[] = { N1, N2 };
4294 return getNode(Opcode, DL, VTList, Ops, 2);
4297 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList,
4298 SDValue N1, SDValue N2, SDValue N3) {
4299 SDValue Ops[] = { N1, N2, N3 };
4300 return getNode(Opcode, DL, VTList, Ops, 3);
4303 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList,
4304 SDValue N1, SDValue N2, SDValue N3,
4306 SDValue Ops[] = { N1, N2, N3, N4 };
4307 return getNode(Opcode, DL, VTList, Ops, 4);
4310 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList,
4311 SDValue N1, SDValue N2, SDValue N3,
4312 SDValue N4, SDValue N5) {
4313 SDValue Ops[] = { N1, N2, N3, N4, N5 };
4314 return getNode(Opcode, DL, VTList, Ops, 5);
4317 SDVTList SelectionDAG::getVTList(EVT VT) {
4318 return makeVTList(SDNode::getValueTypeList(VT), 1);
4321 SDVTList SelectionDAG::getVTList(EVT VT1, EVT VT2) {
4322 for (std::vector<SDVTList>::reverse_iterator I = VTList.rbegin(),
4323 E = VTList.rend(); I != E; ++I)
4324 if (I->NumVTs == 2 && I->VTs[0] == VT1 && I->VTs[1] == VT2)
4327 EVT *Array = Allocator.Allocate<EVT>(2);
4330 SDVTList Result = makeVTList(Array, 2);
4331 VTList.push_back(Result);
4335 SDVTList SelectionDAG::getVTList(EVT VT1, EVT VT2, EVT VT3) {
4336 for (std::vector<SDVTList>::reverse_iterator I = VTList.rbegin(),
4337 E = VTList.rend(); I != E; ++I)
4338 if (I->NumVTs == 3 && I->VTs[0] == VT1 && I->VTs[1] == VT2 &&
4342 EVT *Array = Allocator.Allocate<EVT>(3);
4346 SDVTList Result = makeVTList(Array, 3);
4347 VTList.push_back(Result);
4351 SDVTList SelectionDAG::getVTList(EVT VT1, EVT VT2, EVT VT3, EVT VT4) {
4352 for (std::vector<SDVTList>::reverse_iterator I = VTList.rbegin(),
4353 E = VTList.rend(); I != E; ++I)
4354 if (I->NumVTs == 4 && I->VTs[0] == VT1 && I->VTs[1] == VT2 &&
4355 I->VTs[2] == VT3 && I->VTs[3] == VT4)
4358 EVT *Array = Allocator.Allocate<EVT>(4);
4363 SDVTList Result = makeVTList(Array, 4);
4364 VTList.push_back(Result);
4368 SDVTList SelectionDAG::getVTList(const EVT *VTs, unsigned NumVTs) {
4370 case 0: llvm_unreachable("Cannot have nodes without results!");
4371 case 1: return getVTList(VTs[0]);
4372 case 2: return getVTList(VTs[0], VTs[1]);
4373 case 3: return getVTList(VTs[0], VTs[1], VTs[2]);
4374 case 4: return getVTList(VTs[0], VTs[1], VTs[2], VTs[3]);
4378 for (std::vector<SDVTList>::reverse_iterator I = VTList.rbegin(),
4379 E = VTList.rend(); I != E; ++I) {
4380 if (I->NumVTs != NumVTs || VTs[0] != I->VTs[0] || VTs[1] != I->VTs[1])
4383 bool NoMatch = false;
4384 for (unsigned i = 2; i != NumVTs; ++i)
4385 if (VTs[i] != I->VTs[i]) {
4393 EVT *Array = Allocator.Allocate<EVT>(NumVTs);
4394 std::copy(VTs, VTs+NumVTs, Array);
4395 SDVTList Result = makeVTList(Array, NumVTs);
4396 VTList.push_back(Result);
4401 /// UpdateNodeOperands - *Mutate* the specified node in-place to have the
4402 /// specified operands. If the resultant node already exists in the DAG,
4403 /// this does not modify the specified node, instead it returns the node that
4404 /// already exists. If the resultant node does not exist in the DAG, the
4405 /// input node is returned. As a degenerate case, if you specify the same
4406 /// input operands as the node already has, the input node is returned.
4407 SDValue SelectionDAG::UpdateNodeOperands(SDValue InN, SDValue Op) {
4408 SDNode *N = InN.getNode();
4409 assert(N->getNumOperands() == 1 && "Update with wrong number of operands");
4411 // Check to see if there is no change.
4412 if (Op == N->getOperand(0)) return InN;
4414 // See if the modified node already exists.
4415 void *InsertPos = 0;
4416 if (SDNode *Existing = FindModifiedNodeSlot(N, Op, InsertPos))
4417 return SDValue(Existing, InN.getResNo());
4419 // Nope it doesn't. Remove the node from its current place in the maps.
4421 if (!RemoveNodeFromCSEMaps(N))
4424 // Now we update the operands.
4425 N->OperandList[0].set(Op);
4427 // If this gets put into a CSE map, add it.
4428 if (InsertPos) CSEMap.InsertNode(N, InsertPos);
4432 SDValue SelectionDAG::
4433 UpdateNodeOperands(SDValue InN, SDValue Op1, SDValue Op2) {
4434 SDNode *N = InN.getNode();
4435 assert(N->getNumOperands() == 2 && "Update with wrong number of operands");
4437 // Check to see if there is no change.
4438 if (Op1 == N->getOperand(0) && Op2 == N->getOperand(1))
4439 return InN; // No operands changed, just return the input node.
4441 // See if the modified node already exists.
4442 void *InsertPos = 0;
4443 if (SDNode *Existing = FindModifiedNodeSlot(N, Op1, Op2, InsertPos))
4444 return SDValue(Existing, InN.getResNo());
4446 // Nope it doesn't. Remove the node from its current place in the maps.
4448 if (!RemoveNodeFromCSEMaps(N))
4451 // Now we update the operands.
4452 if (N->OperandList[0] != Op1)
4453 N->OperandList[0].set(Op1);
4454 if (N->OperandList[1] != Op2)
4455 N->OperandList[1].set(Op2);
4457 // If this gets put into a CSE map, add it.
4458 if (InsertPos) CSEMap.InsertNode(N, InsertPos);
4462 SDValue SelectionDAG::
4463 UpdateNodeOperands(SDValue N, SDValue Op1, SDValue Op2, SDValue Op3) {
4464 SDValue Ops[] = { Op1, Op2, Op3 };
4465 return UpdateNodeOperands(N, Ops, 3);
4468 SDValue SelectionDAG::
4469 UpdateNodeOperands(SDValue N, SDValue Op1, SDValue Op2,
4470 SDValue Op3, SDValue Op4) {
4471 SDValue Ops[] = { Op1, Op2, Op3, Op4 };
4472 return UpdateNodeOperands(N, Ops, 4);
4475 SDValue SelectionDAG::
4476 UpdateNodeOperands(SDValue N, SDValue Op1, SDValue Op2,
4477 SDValue Op3, SDValue Op4, SDValue Op5) {
4478 SDValue Ops[] = { Op1, Op2, Op3, Op4, Op5 };
4479 return UpdateNodeOperands(N, Ops, 5);
4482 SDValue SelectionDAG::
4483 UpdateNodeOperands(SDValue InN, const SDValue *Ops, unsigned NumOps) {
4484 SDNode *N = InN.getNode();
4485 assert(N->getNumOperands() == NumOps &&
4486 "Update with wrong number of operands");
4488 // Check to see if there is no change.
4489 bool AnyChange = false;
4490 for (unsigned i = 0; i != NumOps; ++i) {
4491 if (Ops[i] != N->getOperand(i)) {
4497 // No operands changed, just return the input node.
4498 if (!AnyChange) return InN;
4500 // See if the modified node already exists.
4501 void *InsertPos = 0;
4502 if (SDNode *Existing = FindModifiedNodeSlot(N, Ops, NumOps, InsertPos))
4503 return SDValue(Existing, InN.getResNo());
4505 // Nope it doesn't. Remove the node from its current place in the maps.
4507 if (!RemoveNodeFromCSEMaps(N))
4510 // Now we update the operands.
4511 for (unsigned i = 0; i != NumOps; ++i)
4512 if (N->OperandList[i] != Ops[i])
4513 N->OperandList[i].set(Ops[i]);
4515 // If this gets put into a CSE map, add it.
4516 if (InsertPos) CSEMap.InsertNode(N, InsertPos);
4520 /// DropOperands - Release the operands and set this node to have
4522 void SDNode::DropOperands() {
4523 // Unlike the code in MorphNodeTo that does this, we don't need to
4524 // watch for dead nodes here.
4525 for (op_iterator I = op_begin(), E = op_end(); I != E; ) {
4531 /// SelectNodeTo - These are wrappers around MorphNodeTo that accept a
4534 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4536 SDVTList VTs = getVTList(VT);
4537 return SelectNodeTo(N, MachineOpc, VTs, 0, 0);
4540 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4541 EVT VT, SDValue Op1) {
4542 SDVTList VTs = getVTList(VT);
4543 SDValue Ops[] = { Op1 };
4544 return SelectNodeTo(N, MachineOpc, VTs, Ops, 1);
4547 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4548 EVT VT, SDValue Op1,
4550 SDVTList VTs = getVTList(VT);
4551 SDValue Ops[] = { Op1, Op2 };
4552 return SelectNodeTo(N, MachineOpc, VTs, Ops, 2);
4555 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4556 EVT VT, SDValue Op1,
4557 SDValue Op2, SDValue Op3) {
4558 SDVTList VTs = getVTList(VT);
4559 SDValue Ops[] = { Op1, Op2, Op3 };
4560 return SelectNodeTo(N, MachineOpc, VTs, Ops, 3);
4563 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4564 EVT VT, const SDValue *Ops,
4566 SDVTList VTs = getVTList(VT);
4567 return SelectNodeTo(N, MachineOpc, VTs, Ops, NumOps);
4570 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4571 EVT VT1, EVT VT2, const SDValue *Ops,
4573 SDVTList VTs = getVTList(VT1, VT2);
4574 return SelectNodeTo(N, MachineOpc, VTs, Ops, NumOps);
4577 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4579 SDVTList VTs = getVTList(VT1, VT2);
4580 return SelectNodeTo(N, MachineOpc, VTs, (SDValue *)0, 0);
4583 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4584 EVT VT1, EVT VT2, EVT VT3,
4585 const SDValue *Ops, unsigned NumOps) {
4586 SDVTList VTs = getVTList(VT1, VT2, VT3);
4587 return SelectNodeTo(N, MachineOpc, VTs, Ops, NumOps);
4590 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4591 EVT VT1, EVT VT2, EVT VT3, EVT VT4,
4592 const SDValue *Ops, unsigned NumOps) {
4593 SDVTList VTs = getVTList(VT1, VT2, VT3, VT4);
4594 return SelectNodeTo(N, MachineOpc, VTs, Ops, NumOps);
4597 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4600 SDVTList VTs = getVTList(VT1, VT2);
4601 SDValue Ops[] = { Op1 };
4602 return SelectNodeTo(N, MachineOpc, VTs, Ops, 1);
4605 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4607 SDValue Op1, SDValue Op2) {
4608 SDVTList VTs = getVTList(VT1, VT2);
4609 SDValue Ops[] = { Op1, Op2 };
4610 return SelectNodeTo(N, MachineOpc, VTs, Ops, 2);
4613 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4615 SDValue Op1, SDValue Op2,
4617 SDVTList VTs = getVTList(VT1, VT2);
4618 SDValue Ops[] = { Op1, Op2, Op3 };
4619 return SelectNodeTo(N, MachineOpc, VTs, Ops, 3);
4622 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4623 EVT VT1, EVT VT2, EVT VT3,
4624 SDValue Op1, SDValue Op2,
4626 SDVTList VTs = getVTList(VT1, VT2, VT3);
4627 SDValue Ops[] = { Op1, Op2, Op3 };
4628 return SelectNodeTo(N, MachineOpc, VTs, Ops, 3);
4631 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4632 SDVTList VTs, const SDValue *Ops,
4634 N = MorphNodeTo(N, ~MachineOpc, VTs, Ops, NumOps);
4635 // Reset the NodeID to -1.
4640 /// MorphNodeTo - This *mutates* the specified node to have the specified
4641 /// return type, opcode, and operands.
4643 /// Note that MorphNodeTo returns the resultant node. If there is already a
4644 /// node of the specified opcode and operands, it returns that node instead of
4645 /// the current one. Note that the DebugLoc need not be the same.
4647 /// Using MorphNodeTo is faster than creating a new node and swapping it in
4648 /// with ReplaceAllUsesWith both because it often avoids allocating a new
4649 /// node, and because it doesn't require CSE recalculation for any of
4650 /// the node's users.
4652 SDNode *SelectionDAG::MorphNodeTo(SDNode *N, unsigned Opc,
4653 SDVTList VTs, const SDValue *Ops,
4655 // If an identical node already exists, use it.
4657 if (VTs.VTs[VTs.NumVTs-1] != MVT::Flag) {
4658 FoldingSetNodeID ID;
4659 AddNodeIDNode(ID, Opc, VTs, Ops, NumOps);
4660 if (SDNode *ON = CSEMap.FindNodeOrInsertPos(ID, IP))
4664 if (!RemoveNodeFromCSEMaps(N))
4667 // Start the morphing.
4669 N->ValueList = VTs.VTs;
4670 N->NumValues = VTs.NumVTs;
4672 // Clear the operands list, updating used nodes to remove this from their
4673 // use list. Keep track of any operands that become dead as a result.
4674 SmallPtrSet<SDNode*, 16> DeadNodeSet;
4675 for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ) {
4677 SDNode *Used = Use.getNode();
4679 if (Used->use_empty())
4680 DeadNodeSet.insert(Used);
4683 if (MachineSDNode *MN = dyn_cast<MachineSDNode>(N)) {
4684 // Initialize the memory references information.
4685 MN->setMemRefs(0, 0);
4686 // If NumOps is larger than the # of operands we can have in a
4687 // MachineSDNode, reallocate the operand list.
4688 if (NumOps > MN->NumOperands || !MN->OperandsNeedDelete) {
4689 if (MN->OperandsNeedDelete)
4690 delete[] MN->OperandList;
4691 if (NumOps > array_lengthof(MN->LocalOperands))
4692 // We're creating a final node that will live unmorphed for the
4693 // remainder of the current SelectionDAG iteration, so we can allocate
4694 // the operands directly out of a pool with no recycling metadata.
4695 MN->InitOperands(OperandAllocator.Allocate<SDUse>(NumOps),
4698 MN->InitOperands(MN->LocalOperands, Ops, NumOps);
4699 MN->OperandsNeedDelete = false;
4701 MN->InitOperands(MN->OperandList, Ops, NumOps);
4703 // If NumOps is larger than the # of operands we currently have, reallocate
4704 // the operand list.
4705 if (NumOps > N->NumOperands) {
4706 if (N->OperandsNeedDelete)
4707 delete[] N->OperandList;
4708 N->InitOperands(new SDUse[NumOps], Ops, NumOps);
4709 N->OperandsNeedDelete = true;
4711 N->InitOperands(N->OperandList, Ops, NumOps);
4714 // Delete any nodes that are still dead after adding the uses for the
4716 if (!DeadNodeSet.empty()) {
4717 SmallVector<SDNode *, 16> DeadNodes;
4718 for (SmallPtrSet<SDNode *, 16>::iterator I = DeadNodeSet.begin(),
4719 E = DeadNodeSet.end(); I != E; ++I)
4720 if ((*I)->use_empty())
4721 DeadNodes.push_back(*I);
4722 RemoveDeadNodes(DeadNodes);
4726 CSEMap.InsertNode(N, IP); // Memoize the new node.
4731 /// getMachineNode - These are used for target selectors to create a new node
4732 /// with specified return type(s), MachineInstr opcode, and operands.
4734 /// Note that getMachineNode returns the resultant node. If there is already a
4735 /// node of the specified opcode and operands, it returns that node instead of
4736 /// the current one.
4738 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT) {
4739 SDVTList VTs = getVTList(VT);
4740 return getMachineNode(Opcode, dl, VTs, 0, 0);
4744 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT, SDValue Op1) {
4745 SDVTList VTs = getVTList(VT);
4746 SDValue Ops[] = { Op1 };
4747 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops));
4751 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT,
4752 SDValue Op1, SDValue Op2) {
4753 SDVTList VTs = getVTList(VT);
4754 SDValue Ops[] = { Op1, Op2 };
4755 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops));
4759 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT,
4760 SDValue Op1, SDValue Op2, SDValue Op3) {
4761 SDVTList VTs = getVTList(VT);
4762 SDValue Ops[] = { Op1, Op2, Op3 };
4763 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops));
4767 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT,
4768 const SDValue *Ops, unsigned NumOps) {
4769 SDVTList VTs = getVTList(VT);
4770 return getMachineNode(Opcode, dl, VTs, Ops, NumOps);
4774 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT1, EVT VT2) {
4775 SDVTList VTs = getVTList(VT1, VT2);
4776 return getMachineNode(Opcode, dl, VTs, 0, 0);
4780 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl,
4781 EVT VT1, EVT VT2, SDValue Op1) {
4782 SDVTList VTs = getVTList(VT1, VT2);
4783 SDValue Ops[] = { Op1 };
4784 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops));
4788 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl,
4789 EVT VT1, EVT VT2, SDValue Op1, SDValue Op2) {
4790 SDVTList VTs = getVTList(VT1, VT2);
4791 SDValue Ops[] = { Op1, Op2 };
4792 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops));
4796 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl,
4797 EVT VT1, EVT VT2, SDValue Op1,
4798 SDValue Op2, SDValue Op3) {
4799 SDVTList VTs = getVTList(VT1, VT2);
4800 SDValue Ops[] = { Op1, Op2, Op3 };
4801 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops));
4805 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl,
4807 const SDValue *Ops, unsigned NumOps) {
4808 SDVTList VTs = getVTList(VT1, VT2);
4809 return getMachineNode(Opcode, dl, VTs, Ops, NumOps);
4813 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl,
4814 EVT VT1, EVT VT2, EVT VT3,
4815 SDValue Op1, SDValue Op2) {
4816 SDVTList VTs = getVTList(VT1, VT2, VT3);
4817 SDValue Ops[] = { Op1, Op2 };
4818 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops));
4822 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl,
4823 EVT VT1, EVT VT2, EVT VT3,
4824 SDValue Op1, SDValue Op2, SDValue Op3) {
4825 SDVTList VTs = getVTList(VT1, VT2, VT3);
4826 SDValue Ops[] = { Op1, Op2, Op3 };
4827 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops));
4831 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl,
4832 EVT VT1, EVT VT2, EVT VT3,
4833 const SDValue *Ops, unsigned NumOps) {
4834 SDVTList VTs = getVTList(VT1, VT2, VT3);
4835 return getMachineNode(Opcode, dl, VTs, Ops, NumOps);
4839 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT1,
4840 EVT VT2, EVT VT3, EVT VT4,
4841 const SDValue *Ops, unsigned NumOps) {
4842 SDVTList VTs = getVTList(VT1, VT2, VT3, VT4);
4843 return getMachineNode(Opcode, dl, VTs, Ops, NumOps);
4847 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl,
4848 const std::vector<EVT> &ResultTys,
4849 const SDValue *Ops, unsigned NumOps) {
4850 SDVTList VTs = getVTList(&ResultTys[0], ResultTys.size());
4851 return getMachineNode(Opcode, dl, VTs, Ops, NumOps);
4855 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc DL, SDVTList VTs,
4856 const SDValue *Ops, unsigned NumOps) {
4857 bool DoCSE = VTs.VTs[VTs.NumVTs-1] != MVT::Flag;
4862 FoldingSetNodeID ID;
4863 AddNodeIDNode(ID, ~Opcode, VTs, Ops, NumOps);
4865 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
4866 return cast<MachineSDNode>(E);
4869 // Allocate a new MachineSDNode.
4870 N = new (NodeAllocator) MachineSDNode(~Opcode, DL, VTs);
4872 // Initialize the operands list.
4873 if (NumOps > array_lengthof(N->LocalOperands))
4874 // We're creating a final node that will live unmorphed for the
4875 // remainder of the current SelectionDAG iteration, so we can allocate
4876 // the operands directly out of a pool with no recycling metadata.
4877 N->InitOperands(OperandAllocator.Allocate<SDUse>(NumOps),
4880 N->InitOperands(N->LocalOperands, Ops, NumOps);
4881 N->OperandsNeedDelete = false;
4884 CSEMap.InsertNode(N, IP);
4886 AllNodes.push_back(N);
4893 /// getTargetExtractSubreg - A convenience function for creating
4894 /// TargetOpcode::EXTRACT_SUBREG nodes.
4896 SelectionDAG::getTargetExtractSubreg(int SRIdx, DebugLoc DL, EVT VT,
4898 SDValue SRIdxVal = getTargetConstant(SRIdx, MVT::i32);
4899 SDNode *Subreg = getMachineNode(TargetOpcode::EXTRACT_SUBREG, DL,
4900 VT, Operand, SRIdxVal);
4901 return SDValue(Subreg, 0);
4904 /// getTargetInsertSubreg - A convenience function for creating
4905 /// TargetOpcode::INSERT_SUBREG nodes.
4907 SelectionDAG::getTargetInsertSubreg(int SRIdx, DebugLoc DL, EVT VT,
4908 SDValue Operand, SDValue Subreg) {
4909 SDValue SRIdxVal = getTargetConstant(SRIdx, MVT::i32);
4910 SDNode *Result = getMachineNode(TargetOpcode::INSERT_SUBREG, DL,
4911 VT, Operand, Subreg, SRIdxVal);
4912 return SDValue(Result, 0);
4915 /// getNodeIfExists - Get the specified node if it's already available, or
4916 /// else return NULL.
4917 SDNode *SelectionDAG::getNodeIfExists(unsigned Opcode, SDVTList VTList,
4918 const SDValue *Ops, unsigned NumOps) {
4919 if (VTList.VTs[VTList.NumVTs-1] != MVT::Flag) {
4920 FoldingSetNodeID ID;
4921 AddNodeIDNode(ID, Opcode, VTList, Ops, NumOps);
4923 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
4929 /// getDbgValue - Creates a SDDbgValue node.
4932 SelectionDAG::getDbgValue(MDNode *MDPtr, SDNode *N, unsigned R, uint64_t Off,
4933 DebugLoc DL, unsigned O) {
4934 return new (Allocator) SDDbgValue(MDPtr, N, R, Off, DL, O);
4938 SelectionDAG::getDbgValue(MDNode *MDPtr, Value *C, uint64_t Off,
4939 DebugLoc DL, unsigned O) {
4940 return new (Allocator) SDDbgValue(MDPtr, C, Off, DL, O);
4944 SelectionDAG::getDbgValue(MDNode *MDPtr, unsigned FI, uint64_t Off,
4945 DebugLoc DL, unsigned O) {
4946 return new (Allocator) SDDbgValue(MDPtr, FI, Off, DL, O);
4951 /// RAUWUpdateListener - Helper for ReplaceAllUsesWith - When the node
4952 /// pointed to by a use iterator is deleted, increment the use iterator
4953 /// so that it doesn't dangle.
4955 /// This class also manages a "downlink" DAGUpdateListener, to forward
4956 /// messages to ReplaceAllUsesWith's callers.
4958 class RAUWUpdateListener : public SelectionDAG::DAGUpdateListener {
4959 SelectionDAG::DAGUpdateListener *DownLink;
4960 SDNode::use_iterator &UI;
4961 SDNode::use_iterator &UE;
4963 virtual void NodeDeleted(SDNode *N, SDNode *E) {
4964 // Increment the iterator as needed.
4965 while (UI != UE && N == *UI)
4968 // Then forward the message.
4969 if (DownLink) DownLink->NodeDeleted(N, E);
4972 virtual void NodeUpdated(SDNode *N) {
4973 // Just forward the message.
4974 if (DownLink) DownLink->NodeUpdated(N);
4978 RAUWUpdateListener(SelectionDAG::DAGUpdateListener *dl,
4979 SDNode::use_iterator &ui,
4980 SDNode::use_iterator &ue)
4981 : DownLink(dl), UI(ui), UE(ue) {}
4986 /// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead.
4987 /// This can cause recursive merging of nodes in the DAG.
4989 /// This version assumes From has a single result value.
4991 void SelectionDAG::ReplaceAllUsesWith(SDValue FromN, SDValue To,
4992 DAGUpdateListener *UpdateListener) {
4993 SDNode *From = FromN.getNode();
4994 assert(From->getNumValues() == 1 && FromN.getResNo() == 0 &&
4995 "Cannot replace with this method!");
4996 assert(From != To.getNode() && "Cannot replace uses of with self");
4998 // Iterate over all the existing uses of From. New uses will be added
4999 // to the beginning of the use list, which we avoid visiting.
5000 // This specifically avoids visiting uses of From that arise while the
5001 // replacement is happening, because any such uses would be the result
5002 // of CSE: If an existing node looks like From after one of its operands
5003 // is replaced by To, we don't want to replace of all its users with To
5004 // too. See PR3018 for more info.
5005 SDNode::use_iterator UI = From->use_begin(), UE = From->use_end();
5006 RAUWUpdateListener Listener(UpdateListener, UI, UE);
5010 // This node is about to morph, remove its old self from the CSE maps.
5011 RemoveNodeFromCSEMaps(User);
5013 // A user can appear in a use list multiple times, and when this
5014 // happens the uses are usually next to each other in the list.
5015 // To help reduce the number of CSE recomputations, process all
5016 // the uses of this user that we can find this way.
5018 SDUse &Use = UI.getUse();
5021 } while (UI != UE && *UI == User);
5023 // Now that we have modified User, add it back to the CSE maps. If it
5024 // already exists there, recursively merge the results together.
5025 AddModifiedNodeToCSEMaps(User, &Listener);
5029 /// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead.
5030 /// This can cause recursive merging of nodes in the DAG.
5032 /// This version assumes that for each value of From, there is a
5033 /// corresponding value in To in the same position with the same type.
5035 void SelectionDAG::ReplaceAllUsesWith(SDNode *From, SDNode *To,
5036 DAGUpdateListener *UpdateListener) {
5038 for (unsigned i = 0, e = From->getNumValues(); i != e; ++i)
5039 assert((!From->hasAnyUseOfValue(i) ||
5040 From->getValueType(i) == To->getValueType(i)) &&
5041 "Cannot use this version of ReplaceAllUsesWith!");
5044 // Handle the trivial case.
5048 // Iterate over just the existing users of From. See the comments in
5049 // the ReplaceAllUsesWith above.
5050 SDNode::use_iterator UI = From->use_begin(), UE = From->use_end();
5051 RAUWUpdateListener Listener(UpdateListener, UI, UE);
5055 // This node is about to morph, remove its old self from the CSE maps.
5056 RemoveNodeFromCSEMaps(User);
5058 // A user can appear in a use list multiple times, and when this
5059 // happens the uses are usually next to each other in the list.
5060 // To help reduce the number of CSE recomputations, process all
5061 // the uses of this user that we can find this way.
5063 SDUse &Use = UI.getUse();
5066 } while (UI != UE && *UI == User);
5068 // Now that we have modified User, add it back to the CSE maps. If it
5069 // already exists there, recursively merge the results together.
5070 AddModifiedNodeToCSEMaps(User, &Listener);
5074 /// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead.
5075 /// This can cause recursive merging of nodes in the DAG.
5077 /// This version can replace From with any result values. To must match the
5078 /// number and types of values returned by From.
5079 void SelectionDAG::ReplaceAllUsesWith(SDNode *From,
5081 DAGUpdateListener *UpdateListener) {
5082 if (From->getNumValues() == 1) // Handle the simple case efficiently.
5083 return ReplaceAllUsesWith(SDValue(From, 0), To[0], UpdateListener);
5085 // Iterate over just the existing users of From. See the comments in
5086 // the ReplaceAllUsesWith above.
5087 SDNode::use_iterator UI = From->use_begin(), UE = From->use_end();
5088 RAUWUpdateListener Listener(UpdateListener, UI, UE);
5092 // This node is about to morph, remove its old self from the CSE maps.
5093 RemoveNodeFromCSEMaps(User);
5095 // A user can appear in a use list multiple times, and when this
5096 // happens the uses are usually next to each other in the list.
5097 // To help reduce the number of CSE recomputations, process all
5098 // the uses of this user that we can find this way.
5100 SDUse &Use = UI.getUse();
5101 const SDValue &ToOp = To[Use.getResNo()];
5104 } while (UI != UE && *UI == User);
5106 // Now that we have modified User, add it back to the CSE maps. If it
5107 // already exists there, recursively merge the results together.
5108 AddModifiedNodeToCSEMaps(User, &Listener);
5112 /// ReplaceAllUsesOfValueWith - Replace any uses of From with To, leaving
5113 /// uses of other values produced by From.getNode() alone. The Deleted
5114 /// vector is handled the same way as for ReplaceAllUsesWith.
5115 void SelectionDAG::ReplaceAllUsesOfValueWith(SDValue From, SDValue To,
5116 DAGUpdateListener *UpdateListener){
5117 // Handle the really simple, really trivial case efficiently.
5118 if (From == To) return;
5120 // Handle the simple, trivial, case efficiently.
5121 if (From.getNode()->getNumValues() == 1) {
5122 ReplaceAllUsesWith(From, To, UpdateListener);
5126 // Iterate over just the existing users of From. See the comments in
5127 // the ReplaceAllUsesWith above.
5128 SDNode::use_iterator UI = From.getNode()->use_begin(),
5129 UE = From.getNode()->use_end();
5130 RAUWUpdateListener Listener(UpdateListener, UI, UE);
5133 bool UserRemovedFromCSEMaps = false;
5135 // A user can appear in a use list multiple times, and when this
5136 // happens the uses are usually next to each other in the list.
5137 // To help reduce the number of CSE recomputations, process all
5138 // the uses of this user that we can find this way.
5140 SDUse &Use = UI.getUse();
5142 // Skip uses of different values from the same node.
5143 if (Use.getResNo() != From.getResNo()) {
5148 // If this node hasn't been modified yet, it's still in the CSE maps,
5149 // so remove its old self from the CSE maps.
5150 if (!UserRemovedFromCSEMaps) {
5151 RemoveNodeFromCSEMaps(User);
5152 UserRemovedFromCSEMaps = true;
5157 } while (UI != UE && *UI == User);
5159 // We are iterating over all uses of the From node, so if a use
5160 // doesn't use the specific value, no changes are made.
5161 if (!UserRemovedFromCSEMaps)
5164 // Now that we have modified User, add it back to the CSE maps. If it
5165 // already exists there, recursively merge the results together.
5166 AddModifiedNodeToCSEMaps(User, &Listener);
5171 /// UseMemo - This class is used by SelectionDAG::ReplaceAllUsesOfValuesWith
5172 /// to record information about a use.
5179 /// operator< - Sort Memos by User.
5180 bool operator<(const UseMemo &L, const UseMemo &R) {
5181 return (intptr_t)L.User < (intptr_t)R.User;
5185 /// ReplaceAllUsesOfValuesWith - Replace any uses of From with To, leaving
5186 /// uses of other values produced by From.getNode() alone. The same value
5187 /// may appear in both the From and To list. The Deleted vector is
5188 /// handled the same way as for ReplaceAllUsesWith.
5189 void SelectionDAG::ReplaceAllUsesOfValuesWith(const SDValue *From,
5192 DAGUpdateListener *UpdateListener){
5193 // Handle the simple, trivial case efficiently.
5195 return ReplaceAllUsesOfValueWith(*From, *To, UpdateListener);
5197 // Read up all the uses and make records of them. This helps
5198 // processing new uses that are introduced during the
5199 // replacement process.
5200 SmallVector<UseMemo, 4> Uses;
5201 for (unsigned i = 0; i != Num; ++i) {
5202 unsigned FromResNo = From[i].getResNo();
5203 SDNode *FromNode = From[i].getNode();
5204 for (SDNode::use_iterator UI = FromNode->use_begin(),
5205 E = FromNode->use_end(); UI != E; ++UI) {
5206 SDUse &Use = UI.getUse();
5207 if (Use.getResNo() == FromResNo) {
5208 UseMemo Memo = { *UI, i, &Use };
5209 Uses.push_back(Memo);
5214 // Sort the uses, so that all the uses from a given User are together.
5215 std::sort(Uses.begin(), Uses.end());
5217 for (unsigned UseIndex = 0, UseIndexEnd = Uses.size();
5218 UseIndex != UseIndexEnd; ) {
5219 // We know that this user uses some value of From. If it is the right
5220 // value, update it.
5221 SDNode *User = Uses[UseIndex].User;
5223 // This node is about to morph, remove its old self from the CSE maps.
5224 RemoveNodeFromCSEMaps(User);
5226 // The Uses array is sorted, so all the uses for a given User
5227 // are next to each other in the list.
5228 // To help reduce the number of CSE recomputations, process all
5229 // the uses of this user that we can find this way.
5231 unsigned i = Uses[UseIndex].Index;
5232 SDUse &Use = *Uses[UseIndex].Use;
5236 } while (UseIndex != UseIndexEnd && Uses[UseIndex].User == User);
5238 // Now that we have modified User, add it back to the CSE maps. If it
5239 // already exists there, recursively merge the results together.
5240 AddModifiedNodeToCSEMaps(User, UpdateListener);
5244 /// AssignTopologicalOrder - Assign a unique node id for each node in the DAG
5245 /// based on their topological order. It returns the maximum id and a vector
5246 /// of the SDNodes* in assigned order by reference.
5247 unsigned SelectionDAG::AssignTopologicalOrder() {
5249 unsigned DAGSize = 0;
5251 // SortedPos tracks the progress of the algorithm. Nodes before it are
5252 // sorted, nodes after it are unsorted. When the algorithm completes
5253 // it is at the end of the list.
5254 allnodes_iterator SortedPos = allnodes_begin();
5256 // Visit all the nodes. Move nodes with no operands to the front of
5257 // the list immediately. Annotate nodes that do have operands with their
5258 // operand count. Before we do this, the Node Id fields of the nodes
5259 // may contain arbitrary values. After, the Node Id fields for nodes
5260 // before SortedPos will contain the topological sort index, and the
5261 // Node Id fields for nodes At SortedPos and after will contain the
5262 // count of outstanding operands.
5263 for (allnodes_iterator I = allnodes_begin(),E = allnodes_end(); I != E; ) {
5266 unsigned Degree = N->getNumOperands();
5268 // A node with no uses, add it to the result array immediately.
5269 N->setNodeId(DAGSize++);
5270 allnodes_iterator Q = N;
5272 SortedPos = AllNodes.insert(SortedPos, AllNodes.remove(Q));
5273 assert(SortedPos != AllNodes.end() && "Overran node list");
5276 // Temporarily use the Node Id as scratch space for the degree count.
5277 N->setNodeId(Degree);
5281 // Visit all the nodes. As we iterate, moves nodes into sorted order,
5282 // such that by the time the end is reached all nodes will be sorted.
5283 for (allnodes_iterator I = allnodes_begin(),E = allnodes_end(); I != E; ++I) {
5286 // N is in sorted position, so all its uses have one less operand
5287 // that needs to be sorted.
5288 for (SDNode::use_iterator UI = N->use_begin(), UE = N->use_end();
5291 unsigned Degree = P->getNodeId();
5292 assert(Degree != 0 && "Invalid node degree");
5295 // All of P's operands are sorted, so P may sorted now.
5296 P->setNodeId(DAGSize++);
5298 SortedPos = AllNodes.insert(SortedPos, AllNodes.remove(P));
5299 assert(SortedPos != AllNodes.end() && "Overran node list");
5302 // Update P's outstanding operand count.
5303 P->setNodeId(Degree);
5306 if (I == SortedPos) {
5309 dbgs() << "Overran sorted position:\n";
5312 llvm_unreachable(0);
5316 assert(SortedPos == AllNodes.end() &&
5317 "Topological sort incomplete!");
5318 assert(AllNodes.front().getOpcode() == ISD::EntryToken &&
5319 "First node in topological sort is not the entry token!");
5320 assert(AllNodes.front().getNodeId() == 0 &&
5321 "First node in topological sort has non-zero id!");
5322 assert(AllNodes.front().getNumOperands() == 0 &&
5323 "First node in topological sort has operands!");
5324 assert(AllNodes.back().getNodeId() == (int)DAGSize-1 &&
5325 "Last node in topologic sort has unexpected id!");
5326 assert(AllNodes.back().use_empty() &&
5327 "Last node in topologic sort has users!");
5328 assert(DAGSize == allnodes_size() && "Node count mismatch!");
5332 /// AssignOrdering - Assign an order to the SDNode.
5333 void SelectionDAG::AssignOrdering(const SDNode *SD, unsigned Order) {
5334 assert(SD && "Trying to assign an order to a null node!");
5335 Ordering->add(SD, Order);
5338 /// GetOrdering - Get the order for the SDNode.
5339 unsigned SelectionDAG::GetOrdering(const SDNode *SD) const {
5340 assert(SD && "Trying to get the order of a null node!");
5341 return Ordering->getOrder(SD);
5344 /// AddDbgValue - Add a dbg_value SDNode. If SD is non-null that means the
5345 /// value is produced by SD.
5346 void SelectionDAG::AddDbgValue(SDDbgValue *DB, SDNode *SD) {
5347 DbgInfo->add(DB, SD);
5349 SD->setHasDebugValue(true);
5352 //===----------------------------------------------------------------------===//
5354 //===----------------------------------------------------------------------===//
5356 HandleSDNode::~HandleSDNode() {
5360 GlobalAddressSDNode::GlobalAddressSDNode(unsigned Opc, const GlobalValue *GA,
5361 EVT VT, int64_t o, unsigned char TF)
5362 : SDNode(Opc, DebugLoc(), getSDVTList(VT)), Offset(o), TargetFlags(TF) {
5363 TheGlobal = const_cast<GlobalValue*>(GA);
5366 MemSDNode::MemSDNode(unsigned Opc, DebugLoc dl, SDVTList VTs, EVT memvt,
5367 MachineMemOperand *mmo)
5368 : SDNode(Opc, dl, VTs), MemoryVT(memvt), MMO(mmo) {
5369 SubclassData = encodeMemSDNodeFlags(0, ISD::UNINDEXED, MMO->isVolatile(),
5370 MMO->isNonTemporal());
5371 assert(isVolatile() == MMO->isVolatile() && "Volatile encoding error!");
5372 assert(isNonTemporal() == MMO->isNonTemporal() &&
5373 "Non-temporal encoding error!");
5374 assert(memvt.getStoreSize() == MMO->getSize() && "Size mismatch!");
5377 MemSDNode::MemSDNode(unsigned Opc, DebugLoc dl, SDVTList VTs,
5378 const SDValue *Ops, unsigned NumOps, EVT memvt,
5379 MachineMemOperand *mmo)
5380 : SDNode(Opc, dl, VTs, Ops, NumOps),
5381 MemoryVT(memvt), MMO(mmo) {
5382 SubclassData = encodeMemSDNodeFlags(0, ISD::UNINDEXED, MMO->isVolatile(),
5383 MMO->isNonTemporal());
5384 assert(isVolatile() == MMO->isVolatile() && "Volatile encoding error!");
5385 assert(memvt.getStoreSize() == MMO->getSize() && "Size mismatch!");
5388 /// Profile - Gather unique data for the node.
5390 void SDNode::Profile(FoldingSetNodeID &ID) const {
5391 AddNodeIDNode(ID, this);
5396 std::vector<EVT> VTs;
5399 VTs.reserve(MVT::LAST_VALUETYPE);
5400 for (unsigned i = 0; i < MVT::LAST_VALUETYPE; ++i)
5401 VTs.push_back(MVT((MVT::SimpleValueType)i));
5406 static ManagedStatic<std::set<EVT, EVT::compareRawBits> > EVTs;
5407 static ManagedStatic<EVTArray> SimpleVTArray;
5408 static ManagedStatic<sys::SmartMutex<true> > VTMutex;
5410 /// getValueTypeList - Return a pointer to the specified value type.
5412 const EVT *SDNode::getValueTypeList(EVT VT) {
5413 if (VT.isExtended()) {
5414 sys::SmartScopedLock<true> Lock(*VTMutex);
5415 return &(*EVTs->insert(VT).first);
5417 return &SimpleVTArray->VTs[VT.getSimpleVT().SimpleTy];
5421 /// hasNUsesOfValue - Return true if there are exactly NUSES uses of the
5422 /// indicated value. This method ignores uses of other values defined by this
5424 bool SDNode::hasNUsesOfValue(unsigned NUses, unsigned Value) const {
5425 assert(Value < getNumValues() && "Bad value!");
5427 // TODO: Only iterate over uses of a given value of the node
5428 for (SDNode::use_iterator UI = use_begin(), E = use_end(); UI != E; ++UI) {
5429 if (UI.getUse().getResNo() == Value) {
5436 // Found exactly the right number of uses?
5441 /// hasAnyUseOfValue - Return true if there are any use of the indicated
5442 /// value. This method ignores uses of other values defined by this operation.
5443 bool SDNode::hasAnyUseOfValue(unsigned Value) const {
5444 assert(Value < getNumValues() && "Bad value!");
5446 for (SDNode::use_iterator UI = use_begin(), E = use_end(); UI != E; ++UI)
5447 if (UI.getUse().getResNo() == Value)
5454 /// isOnlyUserOf - Return true if this node is the only use of N.
5456 bool SDNode::isOnlyUserOf(SDNode *N) const {
5458 for (SDNode::use_iterator I = N->use_begin(), E = N->use_end(); I != E; ++I) {
5469 /// isOperand - Return true if this node is an operand of N.
5471 bool SDValue::isOperandOf(SDNode *N) const {
5472 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i)
5473 if (*this == N->getOperand(i))
5478 bool SDNode::isOperandOf(SDNode *N) const {
5479 for (unsigned i = 0, e = N->NumOperands; i != e; ++i)
5480 if (this == N->OperandList[i].getNode())
5485 /// reachesChainWithoutSideEffects - Return true if this operand (which must
5486 /// be a chain) reaches the specified operand without crossing any
5487 /// side-effecting instructions. In practice, this looks through token
5488 /// factors and non-volatile loads. In order to remain efficient, this only
5489 /// looks a couple of nodes in, it does not do an exhaustive search.
5490 bool SDValue::reachesChainWithoutSideEffects(SDValue Dest,
5491 unsigned Depth) const {
5492 if (*this == Dest) return true;
5494 // Don't search too deeply, we just want to be able to see through
5495 // TokenFactor's etc.
5496 if (Depth == 0) return false;
5498 // If this is a token factor, all inputs to the TF happen in parallel. If any
5499 // of the operands of the TF reach dest, then we can do the xform.
5500 if (getOpcode() == ISD::TokenFactor) {
5501 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
5502 if (getOperand(i).reachesChainWithoutSideEffects(Dest, Depth-1))
5507 // Loads don't have side effects, look through them.
5508 if (LoadSDNode *Ld = dyn_cast<LoadSDNode>(*this)) {
5509 if (!Ld->isVolatile())
5510 return Ld->getChain().reachesChainWithoutSideEffects(Dest, Depth-1);
5515 /// isPredecessorOf - Return true if this node is a predecessor of N. This node
5516 /// is either an operand of N or it can be reached by traversing up the operands.
5517 /// NOTE: this is an expensive method. Use it carefully.
5518 bool SDNode::isPredecessorOf(SDNode *N) const {
5519 SmallPtrSet<SDNode *, 32> Visited;
5520 SmallVector<SDNode *, 16> Worklist;
5521 Worklist.push_back(N);
5524 N = Worklist.pop_back_val();
5525 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
5526 SDNode *Op = N->getOperand(i).getNode();
5529 if (Visited.insert(Op))
5530 Worklist.push_back(Op);
5532 } while (!Worklist.empty());
5537 uint64_t SDNode::getConstantOperandVal(unsigned Num) const {
5538 assert(Num < NumOperands && "Invalid child # of SDNode!");
5539 return cast<ConstantSDNode>(OperandList[Num])->getZExtValue();
5542 std::string SDNode::getOperationName(const SelectionDAG *G) const {
5543 switch (getOpcode()) {
5545 if (getOpcode() < ISD::BUILTIN_OP_END)
5546 return "<<Unknown DAG Node>>";
5547 if (isMachineOpcode()) {
5549 if (const TargetInstrInfo *TII = G->getTarget().getInstrInfo())
5550 if (getMachineOpcode() < TII->getNumOpcodes())
5551 return TII->get(getMachineOpcode()).getName();
5552 return "<<Unknown Machine Node #" + utostr(getOpcode()) + ">>";
5555 const TargetLowering &TLI = G->getTargetLoweringInfo();
5556 const char *Name = TLI.getTargetNodeName(getOpcode());
5557 if (Name) return Name;
5558 return "<<Unknown Target Node #" + utostr(getOpcode()) + ">>";
5560 return "<<Unknown Node #" + utostr(getOpcode()) + ">>";
5563 case ISD::DELETED_NODE:
5564 return "<<Deleted Node!>>";
5566 case ISD::PREFETCH: return "Prefetch";
5567 case ISD::MEMBARRIER: return "MemBarrier";
5568 case ISD::ATOMIC_CMP_SWAP: return "AtomicCmpSwap";
5569 case ISD::ATOMIC_SWAP: return "AtomicSwap";
5570 case ISD::ATOMIC_LOAD_ADD: return "AtomicLoadAdd";
5571 case ISD::ATOMIC_LOAD_SUB: return "AtomicLoadSub";
5572 case ISD::ATOMIC_LOAD_AND: return "AtomicLoadAnd";
5573 case ISD::ATOMIC_LOAD_OR: return "AtomicLoadOr";
5574 case ISD::ATOMIC_LOAD_XOR: return "AtomicLoadXor";
5575 case ISD::ATOMIC_LOAD_NAND: return "AtomicLoadNand";
5576 case ISD::ATOMIC_LOAD_MIN: return "AtomicLoadMin";
5577 case ISD::ATOMIC_LOAD_MAX: return "AtomicLoadMax";
5578 case ISD::ATOMIC_LOAD_UMIN: return "AtomicLoadUMin";
5579 case ISD::ATOMIC_LOAD_UMAX: return "AtomicLoadUMax";
5580 case ISD::PCMARKER: return "PCMarker";
5581 case ISD::READCYCLECOUNTER: return "ReadCycleCounter";
5582 case ISD::SRCVALUE: return "SrcValue";
5583 case ISD::MDNODE_SDNODE: return "MDNode";
5584 case ISD::EntryToken: return "EntryToken";
5585 case ISD::TokenFactor: return "TokenFactor";
5586 case ISD::AssertSext: return "AssertSext";
5587 case ISD::AssertZext: return "AssertZext";
5589 case ISD::BasicBlock: return "BasicBlock";
5590 case ISD::VALUETYPE: return "ValueType";
5591 case ISD::Register: return "Register";
5593 case ISD::Constant: return "Constant";
5594 case ISD::ConstantFP: return "ConstantFP";
5595 case ISD::GlobalAddress: return "GlobalAddress";
5596 case ISD::GlobalTLSAddress: return "GlobalTLSAddress";
5597 case ISD::FrameIndex: return "FrameIndex";
5598 case ISD::JumpTable: return "JumpTable";
5599 case ISD::GLOBAL_OFFSET_TABLE: return "GLOBAL_OFFSET_TABLE";
5600 case ISD::RETURNADDR: return "RETURNADDR";
5601 case ISD::FRAMEADDR: return "FRAMEADDR";
5602 case ISD::FRAME_TO_ARGS_OFFSET: return "FRAME_TO_ARGS_OFFSET";
5603 case ISD::EXCEPTIONADDR: return "EXCEPTIONADDR";
5604 case ISD::LSDAADDR: return "LSDAADDR";
5605 case ISD::EHSELECTION: return "EHSELECTION";
5606 case ISD::EH_RETURN: return "EH_RETURN";
5607 case ISD::ConstantPool: return "ConstantPool";
5608 case ISD::ExternalSymbol: return "ExternalSymbol";
5609 case ISD::BlockAddress: return "BlockAddress";
5610 case ISD::INTRINSIC_WO_CHAIN:
5611 case ISD::INTRINSIC_VOID:
5612 case ISD::INTRINSIC_W_CHAIN: {
5613 unsigned OpNo = getOpcode() == ISD::INTRINSIC_WO_CHAIN ? 0 : 1;
5614 unsigned IID = cast<ConstantSDNode>(getOperand(OpNo))->getZExtValue();
5615 if (IID < Intrinsic::num_intrinsics)
5616 return Intrinsic::getName((Intrinsic::ID)IID);
5617 else if (const TargetIntrinsicInfo *TII = G->getTarget().getIntrinsicInfo())
5618 return TII->getName(IID);
5619 llvm_unreachable("Invalid intrinsic ID");
5622 case ISD::BUILD_VECTOR: return "BUILD_VECTOR";
5623 case ISD::TargetConstant: return "TargetConstant";
5624 case ISD::TargetConstantFP:return "TargetConstantFP";
5625 case ISD::TargetGlobalAddress: return "TargetGlobalAddress";
5626 case ISD::TargetGlobalTLSAddress: return "TargetGlobalTLSAddress";
5627 case ISD::TargetFrameIndex: return "TargetFrameIndex";
5628 case ISD::TargetJumpTable: return "TargetJumpTable";
5629 case ISD::TargetConstantPool: return "TargetConstantPool";
5630 case ISD::TargetExternalSymbol: return "TargetExternalSymbol";
5631 case ISD::TargetBlockAddress: return "TargetBlockAddress";
5633 case ISD::CopyToReg: return "CopyToReg";
5634 case ISD::CopyFromReg: return "CopyFromReg";
5635 case ISD::UNDEF: return "undef";
5636 case ISD::MERGE_VALUES: return "merge_values";
5637 case ISD::INLINEASM: return "inlineasm";
5638 case ISD::EH_LABEL: return "eh_label";
5639 case ISD::HANDLENODE: return "handlenode";
5642 case ISD::FABS: return "fabs";
5643 case ISD::FNEG: return "fneg";
5644 case ISD::FSQRT: return "fsqrt";
5645 case ISD::FSIN: return "fsin";
5646 case ISD::FCOS: return "fcos";
5647 case ISD::FPOWI: return "fpowi";
5648 case ISD::FPOW: return "fpow";
5649 case ISD::FTRUNC: return "ftrunc";
5650 case ISD::FFLOOR: return "ffloor";
5651 case ISD::FCEIL: return "fceil";
5652 case ISD::FRINT: return "frint";
5653 case ISD::FNEARBYINT: return "fnearbyint";
5656 case ISD::ADD: return "add";
5657 case ISD::SUB: return "sub";
5658 case ISD::MUL: return "mul";
5659 case ISD::MULHU: return "mulhu";
5660 case ISD::MULHS: return "mulhs";
5661 case ISD::SDIV: return "sdiv";
5662 case ISD::UDIV: return "udiv";
5663 case ISD::SREM: return "srem";
5664 case ISD::UREM: return "urem";
5665 case ISD::SMUL_LOHI: return "smul_lohi";
5666 case ISD::UMUL_LOHI: return "umul_lohi";
5667 case ISD::SDIVREM: return "sdivrem";
5668 case ISD::UDIVREM: return "udivrem";
5669 case ISD::AND: return "and";
5670 case ISD::OR: return "or";
5671 case ISD::XOR: return "xor";
5672 case ISD::SHL: return "shl";
5673 case ISD::SRA: return "sra";
5674 case ISD::SRL: return "srl";
5675 case ISD::ROTL: return "rotl";
5676 case ISD::ROTR: return "rotr";
5677 case ISD::FADD: return "fadd";
5678 case ISD::FSUB: return "fsub";
5679 case ISD::FMUL: return "fmul";
5680 case ISD::FDIV: return "fdiv";
5681 case ISD::FREM: return "frem";
5682 case ISD::FCOPYSIGN: return "fcopysign";
5683 case ISD::FGETSIGN: return "fgetsign";
5685 case ISD::SETCC: return "setcc";
5686 case ISD::VSETCC: return "vsetcc";
5687 case ISD::SELECT: return "select";
5688 case ISD::SELECT_CC: return "select_cc";
5689 case ISD::INSERT_VECTOR_ELT: return "insert_vector_elt";
5690 case ISD::EXTRACT_VECTOR_ELT: return "extract_vector_elt";
5691 case ISD::CONCAT_VECTORS: return "concat_vectors";
5692 case ISD::EXTRACT_SUBVECTOR: return "extract_subvector";
5693 case ISD::SCALAR_TO_VECTOR: return "scalar_to_vector";
5694 case ISD::VECTOR_SHUFFLE: return "vector_shuffle";
5695 case ISD::CARRY_FALSE: return "carry_false";
5696 case ISD::ADDC: return "addc";
5697 case ISD::ADDE: return "adde";
5698 case ISD::SADDO: return "saddo";
5699 case ISD::UADDO: return "uaddo";
5700 case ISD::SSUBO: return "ssubo";
5701 case ISD::USUBO: return "usubo";
5702 case ISD::SMULO: return "smulo";
5703 case ISD::UMULO: return "umulo";
5704 case ISD::SUBC: return "subc";
5705 case ISD::SUBE: return "sube";
5706 case ISD::SHL_PARTS: return "shl_parts";
5707 case ISD::SRA_PARTS: return "sra_parts";
5708 case ISD::SRL_PARTS: return "srl_parts";
5710 // Conversion operators.
5711 case ISD::SIGN_EXTEND: return "sign_extend";
5712 case ISD::ZERO_EXTEND: return "zero_extend";
5713 case ISD::ANY_EXTEND: return "any_extend";
5714 case ISD::SIGN_EXTEND_INREG: return "sign_extend_inreg";
5715 case ISD::TRUNCATE: return "truncate";
5716 case ISD::FP_ROUND: return "fp_round";
5717 case ISD::FLT_ROUNDS_: return "flt_rounds";
5718 case ISD::FP_ROUND_INREG: return "fp_round_inreg";
5719 case ISD::FP_EXTEND: return "fp_extend";
5721 case ISD::SINT_TO_FP: return "sint_to_fp";
5722 case ISD::UINT_TO_FP: return "uint_to_fp";
5723 case ISD::FP_TO_SINT: return "fp_to_sint";
5724 case ISD::FP_TO_UINT: return "fp_to_uint";
5725 case ISD::BIT_CONVERT: return "bit_convert";
5726 case ISD::FP16_TO_FP32: return "fp16_to_fp32";
5727 case ISD::FP32_TO_FP16: return "fp32_to_fp16";
5729 case ISD::CONVERT_RNDSAT: {
5730 switch (cast<CvtRndSatSDNode>(this)->getCvtCode()) {
5731 default: llvm_unreachable("Unknown cvt code!");
5732 case ISD::CVT_FF: return "cvt_ff";
5733 case ISD::CVT_FS: return "cvt_fs";
5734 case ISD::CVT_FU: return "cvt_fu";
5735 case ISD::CVT_SF: return "cvt_sf";
5736 case ISD::CVT_UF: return "cvt_uf";
5737 case ISD::CVT_SS: return "cvt_ss";
5738 case ISD::CVT_SU: return "cvt_su";
5739 case ISD::CVT_US: return "cvt_us";
5740 case ISD::CVT_UU: return "cvt_uu";
5744 // Control flow instructions
5745 case ISD::BR: return "br";
5746 case ISD::BRIND: return "brind";
5747 case ISD::BR_JT: return "br_jt";
5748 case ISD::BRCOND: return "brcond";
5749 case ISD::BR_CC: return "br_cc";
5750 case ISD::CALLSEQ_START: return "callseq_start";
5751 case ISD::CALLSEQ_END: return "callseq_end";
5754 case ISD::LOAD: return "load";
5755 case ISD::STORE: return "store";
5756 case ISD::VAARG: return "vaarg";
5757 case ISD::VACOPY: return "vacopy";
5758 case ISD::VAEND: return "vaend";
5759 case ISD::VASTART: return "vastart";
5760 case ISD::DYNAMIC_STACKALLOC: return "dynamic_stackalloc";
5761 case ISD::EXTRACT_ELEMENT: return "extract_element";
5762 case ISD::BUILD_PAIR: return "build_pair";
5763 case ISD::STACKSAVE: return "stacksave";
5764 case ISD::STACKRESTORE: return "stackrestore";
5765 case ISD::TRAP: return "trap";
5768 case ISD::BSWAP: return "bswap";
5769 case ISD::CTPOP: return "ctpop";
5770 case ISD::CTTZ: return "cttz";
5771 case ISD::CTLZ: return "ctlz";
5774 case ISD::TRAMPOLINE: return "trampoline";
5777 switch (cast<CondCodeSDNode>(this)->get()) {
5778 default: llvm_unreachable("Unknown setcc condition!");
5779 case ISD::SETOEQ: return "setoeq";
5780 case ISD::SETOGT: return "setogt";
5781 case ISD::SETOGE: return "setoge";
5782 case ISD::SETOLT: return "setolt";
5783 case ISD::SETOLE: return "setole";
5784 case ISD::SETONE: return "setone";
5786 case ISD::SETO: return "seto";
5787 case ISD::SETUO: return "setuo";
5788 case ISD::SETUEQ: return "setue";
5789 case ISD::SETUGT: return "setugt";
5790 case ISD::SETUGE: return "setuge";
5791 case ISD::SETULT: return "setult";
5792 case ISD::SETULE: return "setule";
5793 case ISD::SETUNE: return "setune";
5795 case ISD::SETEQ: return "seteq";
5796 case ISD::SETGT: return "setgt";
5797 case ISD::SETGE: return "setge";
5798 case ISD::SETLT: return "setlt";
5799 case ISD::SETLE: return "setle";
5800 case ISD::SETNE: return "setne";
5805 const char *SDNode::getIndexedModeName(ISD::MemIndexedMode AM) {
5814 return "<post-inc>";
5816 return "<post-dec>";
5820 std::string ISD::ArgFlagsTy::getArgFlagsString() {
5821 std::string S = "< ";
5835 if (getByValAlign())
5836 S += "byval-align:" + utostr(getByValAlign()) + " ";
5838 S += "orig-align:" + utostr(getOrigAlign()) + " ";
5840 S += "byval-size:" + utostr(getByValSize()) + " ";
5844 void SDNode::dump() const { dump(0); }
5845 void SDNode::dump(const SelectionDAG *G) const {
5849 void SDNode::print_types(raw_ostream &OS, const SelectionDAG *G) const {
5850 OS << (void*)this << ": ";
5852 for (unsigned i = 0, e = getNumValues(); i != e; ++i) {
5854 if (getValueType(i) == MVT::Other)
5857 OS << getValueType(i).getEVTString();
5859 OS << " = " << getOperationName(G);
5862 void SDNode::print_details(raw_ostream &OS, const SelectionDAG *G) const {
5863 if (const MachineSDNode *MN = dyn_cast<MachineSDNode>(this)) {
5864 if (!MN->memoperands_empty()) {
5867 for (MachineSDNode::mmo_iterator i = MN->memoperands_begin(),
5868 e = MN->memoperands_end(); i != e; ++i) {
5875 } else if (const ShuffleVectorSDNode *SVN =
5876 dyn_cast<ShuffleVectorSDNode>(this)) {
5878 for (unsigned i = 0, e = ValueList[0].getVectorNumElements(); i != e; ++i) {
5879 int Idx = SVN->getMaskElt(i);
5887 } else if (const ConstantSDNode *CSDN = dyn_cast<ConstantSDNode>(this)) {
5888 OS << '<' << CSDN->getAPIntValue() << '>';
5889 } else if (const ConstantFPSDNode *CSDN = dyn_cast<ConstantFPSDNode>(this)) {
5890 if (&CSDN->getValueAPF().getSemantics()==&APFloat::IEEEsingle)
5891 OS << '<' << CSDN->getValueAPF().convertToFloat() << '>';
5892 else if (&CSDN->getValueAPF().getSemantics()==&APFloat::IEEEdouble)
5893 OS << '<' << CSDN->getValueAPF().convertToDouble() << '>';
5896 CSDN->getValueAPF().bitcastToAPInt().dump();
5899 } else if (const GlobalAddressSDNode *GADN =
5900 dyn_cast<GlobalAddressSDNode>(this)) {
5901 int64_t offset = GADN->getOffset();
5903 WriteAsOperand(OS, GADN->getGlobal());
5906 OS << " + " << offset;
5908 OS << " " << offset;
5909 if (unsigned int TF = GADN->getTargetFlags())
5910 OS << " [TF=" << TF << ']';
5911 } else if (const FrameIndexSDNode *FIDN = dyn_cast<FrameIndexSDNode>(this)) {
5912 OS << "<" << FIDN->getIndex() << ">";
5913 } else if (const JumpTableSDNode *JTDN = dyn_cast<JumpTableSDNode>(this)) {
5914 OS << "<" << JTDN->getIndex() << ">";
5915 if (unsigned int TF = JTDN->getTargetFlags())
5916 OS << " [TF=" << TF << ']';
5917 } else if (const ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(this)){
5918 int offset = CP->getOffset();
5919 if (CP->isMachineConstantPoolEntry())
5920 OS << "<" << *CP->getMachineCPVal() << ">";
5922 OS << "<" << *CP->getConstVal() << ">";
5924 OS << " + " << offset;
5926 OS << " " << offset;
5927 if (unsigned int TF = CP->getTargetFlags())
5928 OS << " [TF=" << TF << ']';
5929 } else if (const BasicBlockSDNode *BBDN = dyn_cast<BasicBlockSDNode>(this)) {
5931 const Value *LBB = (const Value*)BBDN->getBasicBlock()->getBasicBlock();
5933 OS << LBB->getName() << " ";
5934 OS << (const void*)BBDN->getBasicBlock() << ">";
5935 } else if (const RegisterSDNode *R = dyn_cast<RegisterSDNode>(this)) {
5936 if (G && R->getReg() &&
5937 TargetRegisterInfo::isPhysicalRegister(R->getReg())) {
5938 OS << " %" << G->getTarget().getRegisterInfo()->getName(R->getReg());
5940 OS << " %reg" << R->getReg();
5942 } else if (const ExternalSymbolSDNode *ES =
5943 dyn_cast<ExternalSymbolSDNode>(this)) {
5944 OS << "'" << ES->getSymbol() << "'";
5945 if (unsigned int TF = ES->getTargetFlags())
5946 OS << " [TF=" << TF << ']';
5947 } else if (const SrcValueSDNode *M = dyn_cast<SrcValueSDNode>(this)) {
5949 OS << "<" << M->getValue() << ">";
5952 } else if (const MDNodeSDNode *MD = dyn_cast<MDNodeSDNode>(this)) {
5954 OS << "<" << MD->getMD() << ">";
5957 } else if (const VTSDNode *N = dyn_cast<VTSDNode>(this)) {
5958 OS << ":" << N->getVT().getEVTString();
5960 else if (const LoadSDNode *LD = dyn_cast<LoadSDNode>(this)) {
5961 OS << "<" << *LD->getMemOperand();
5964 switch (LD->getExtensionType()) {
5965 default: doExt = false; break;
5966 case ISD::EXTLOAD: OS << ", anyext"; break;
5967 case ISD::SEXTLOAD: OS << ", sext"; break;
5968 case ISD::ZEXTLOAD: OS << ", zext"; break;
5971 OS << " from " << LD->getMemoryVT().getEVTString();
5973 const char *AM = getIndexedModeName(LD->getAddressingMode());
5978 } else if (const StoreSDNode *ST = dyn_cast<StoreSDNode>(this)) {
5979 OS << "<" << *ST->getMemOperand();
5981 if (ST->isTruncatingStore())
5982 OS << ", trunc to " << ST->getMemoryVT().getEVTString();
5984 const char *AM = getIndexedModeName(ST->getAddressingMode());
5989 } else if (const MemSDNode* M = dyn_cast<MemSDNode>(this)) {
5990 OS << "<" << *M->getMemOperand() << ">";
5991 } else if (const BlockAddressSDNode *BA =
5992 dyn_cast<BlockAddressSDNode>(this)) {
5994 WriteAsOperand(OS, BA->getBlockAddress()->getFunction(), false);
5996 WriteAsOperand(OS, BA->getBlockAddress()->getBasicBlock(), false);
5998 if (unsigned int TF = BA->getTargetFlags())
5999 OS << " [TF=" << TF << ']';
6003 if (unsigned Order = G->GetOrdering(this))
6004 OS << " [ORD=" << Order << ']';
6006 if (getNodeId() != -1)
6007 OS << " [ID=" << getNodeId() << ']';
6010 void SDNode::print(raw_ostream &OS, const SelectionDAG *G) const {
6012 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
6013 if (i) OS << ", "; else OS << " ";
6014 OS << (void*)getOperand(i).getNode();
6015 if (unsigned RN = getOperand(i).getResNo())
6018 print_details(OS, G);
6021 static void printrWithDepthHelper(raw_ostream &OS, const SDNode *N,
6022 const SelectionDAG *G, unsigned depth,
6035 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
6037 printrWithDepthHelper(OS, N->getOperand(i).getNode(), G, depth-1, indent+2);
6041 void SDNode::printrWithDepth(raw_ostream &OS, const SelectionDAG *G,
6042 unsigned depth) const {
6043 printrWithDepthHelper(OS, this, G, depth, 0);
6046 void SDNode::printrFull(raw_ostream &OS, const SelectionDAG *G) const {
6047 // Don't print impossibly deep things.
6048 printrWithDepth(OS, G, 100);
6051 void SDNode::dumprWithDepth(const SelectionDAG *G, unsigned depth) const {
6052 printrWithDepth(dbgs(), G, depth);
6055 void SDNode::dumprFull(const SelectionDAG *G) const {
6056 // Don't print impossibly deep things.
6057 dumprWithDepth(G, 100);
6060 static void DumpNodes(const SDNode *N, unsigned indent, const SelectionDAG *G) {
6061 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i)
6062 if (N->getOperand(i).getNode()->hasOneUse())
6063 DumpNodes(N->getOperand(i).getNode(), indent+2, G);
6065 dbgs() << "\n" << std::string(indent+2, ' ')
6066 << (void*)N->getOperand(i).getNode() << ": <multiple use>";
6070 dbgs().indent(indent);
6074 SDValue SelectionDAG::UnrollVectorOp(SDNode *N, unsigned ResNE) {
6075 assert(N->getNumValues() == 1 &&
6076 "Can't unroll a vector with multiple results!");
6078 EVT VT = N->getValueType(0);
6079 unsigned NE = VT.getVectorNumElements();
6080 EVT EltVT = VT.getVectorElementType();
6081 DebugLoc dl = N->getDebugLoc();
6083 SmallVector<SDValue, 8> Scalars;
6084 SmallVector<SDValue, 4> Operands(N->getNumOperands());
6086 // If ResNE is 0, fully unroll the vector op.
6089 else if (NE > ResNE)
6093 for (i= 0; i != NE; ++i) {
6094 for (unsigned j = 0; j != N->getNumOperands(); ++j) {
6095 SDValue Operand = N->getOperand(j);
6096 EVT OperandVT = Operand.getValueType();
6097 if (OperandVT.isVector()) {
6098 // A vector operand; extract a single element.
6099 EVT OperandEltVT = OperandVT.getVectorElementType();
6100 Operands[j] = getNode(ISD::EXTRACT_VECTOR_ELT, dl,
6103 getConstant(i, MVT::i32));
6105 // A scalar operand; just use it as is.
6106 Operands[j] = Operand;
6110 switch (N->getOpcode()) {
6112 Scalars.push_back(getNode(N->getOpcode(), dl, EltVT,
6113 &Operands[0], Operands.size()));
6120 Scalars.push_back(getNode(N->getOpcode(), dl, EltVT, Operands[0],
6121 getShiftAmountOperand(Operands[1])));
6123 case ISD::SIGN_EXTEND_INREG:
6124 case ISD::FP_ROUND_INREG: {
6125 EVT ExtVT = cast<VTSDNode>(Operands[1])->getVT().getVectorElementType();
6126 Scalars.push_back(getNode(N->getOpcode(), dl, EltVT,
6128 getValueType(ExtVT)));
6133 for (; i < ResNE; ++i)
6134 Scalars.push_back(getUNDEF(EltVT));
6136 return getNode(ISD::BUILD_VECTOR, dl,
6137 EVT::getVectorVT(*getContext(), EltVT, ResNE),
6138 &Scalars[0], Scalars.size());
6142 /// isConsecutiveLoad - Return true if LD is loading 'Bytes' bytes from a
6143 /// location that is 'Dist' units away from the location that the 'Base' load
6144 /// is loading from.
6145 bool SelectionDAG::isConsecutiveLoad(LoadSDNode *LD, LoadSDNode *Base,
6146 unsigned Bytes, int Dist) const {
6147 if (LD->getChain() != Base->getChain())
6149 EVT VT = LD->getValueType(0);
6150 if (VT.getSizeInBits() / 8 != Bytes)
6153 SDValue Loc = LD->getOperand(1);
6154 SDValue BaseLoc = Base->getOperand(1);
6155 if (Loc.getOpcode() == ISD::FrameIndex) {
6156 if (BaseLoc.getOpcode() != ISD::FrameIndex)
6158 const MachineFrameInfo *MFI = getMachineFunction().getFrameInfo();
6159 int FI = cast<FrameIndexSDNode>(Loc)->getIndex();
6160 int BFI = cast<FrameIndexSDNode>(BaseLoc)->getIndex();
6161 int FS = MFI->getObjectSize(FI);
6162 int BFS = MFI->getObjectSize(BFI);
6163 if (FS != BFS || FS != (int)Bytes) return false;
6164 return MFI->getObjectOffset(FI) == (MFI->getObjectOffset(BFI) + Dist*Bytes);
6166 if (Loc.getOpcode() == ISD::ADD && Loc.getOperand(0) == BaseLoc) {
6167 ConstantSDNode *V = dyn_cast<ConstantSDNode>(Loc.getOperand(1));
6168 if (V && (V->getSExtValue() == Dist*Bytes))
6172 GlobalValue *GV1 = NULL;
6173 GlobalValue *GV2 = NULL;
6174 int64_t Offset1 = 0;
6175 int64_t Offset2 = 0;
6176 bool isGA1 = TLI.isGAPlusOffset(Loc.getNode(), GV1, Offset1);
6177 bool isGA2 = TLI.isGAPlusOffset(BaseLoc.getNode(), GV2, Offset2);
6178 if (isGA1 && isGA2 && GV1 == GV2)
6179 return Offset1 == (Offset2 + Dist*Bytes);
6184 /// InferPtrAlignment - Infer alignment of a load / store address. Return 0 if
6185 /// it cannot be inferred.
6186 unsigned SelectionDAG::InferPtrAlignment(SDValue Ptr) const {
6187 // If this is a GlobalAddress + cst, return the alignment.
6189 int64_t GVOffset = 0;
6190 if (TLI.isGAPlusOffset(Ptr.getNode(), GV, GVOffset)) {
6191 // If GV has specified alignment, then use it. Otherwise, use the preferred
6193 unsigned Align = GV->getAlignment();
6195 if (GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV)) {
6196 if (GVar->hasInitializer()) {
6197 const TargetData *TD = TLI.getTargetData();
6198 Align = TD->getPreferredAlignment(GVar);
6202 return MinAlign(Align, GVOffset);
6205 // If this is a direct reference to a stack slot, use information about the
6206 // stack slot's alignment.
6207 int FrameIdx = 1 << 31;
6208 int64_t FrameOffset = 0;
6209 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Ptr)) {
6210 FrameIdx = FI->getIndex();
6211 } else if (Ptr.getOpcode() == ISD::ADD &&
6212 isa<ConstantSDNode>(Ptr.getOperand(1)) &&
6213 isa<FrameIndexSDNode>(Ptr.getOperand(0))) {
6214 FrameIdx = cast<FrameIndexSDNode>(Ptr.getOperand(0))->getIndex();
6215 FrameOffset = Ptr.getConstantOperandVal(1);
6218 if (FrameIdx != (1 << 31)) {
6219 // FIXME: Handle FI+CST.
6220 const MachineFrameInfo &MFI = *getMachineFunction().getFrameInfo();
6221 unsigned FIInfoAlign = MinAlign(MFI.getObjectAlignment(FrameIdx),
6223 if (MFI.isFixedObjectIndex(FrameIdx)) {
6224 int64_t ObjectOffset = MFI.getObjectOffset(FrameIdx) + FrameOffset;
6226 // The alignment of the frame index can be determined from its offset from
6227 // the incoming frame position. If the frame object is at offset 32 and
6228 // the stack is guaranteed to be 16-byte aligned, then we know that the
6229 // object is 16-byte aligned.
6230 unsigned StackAlign = getTarget().getFrameInfo()->getStackAlignment();
6231 unsigned Align = MinAlign(ObjectOffset, StackAlign);
6233 // Finally, the frame object itself may have a known alignment. Factor
6234 // the alignment + offset into a new alignment. For example, if we know
6235 // the FI is 8 byte aligned, but the pointer is 4 off, we really have a
6236 // 4-byte alignment of the resultant pointer. Likewise align 4 + 4-byte
6237 // offset = 4-byte alignment, align 4 + 1-byte offset = align 1, etc.
6238 return std::max(Align, FIInfoAlign);
6246 void SelectionDAG::dump() const {
6247 dbgs() << "SelectionDAG has " << AllNodes.size() << " nodes:";
6249 for (allnodes_const_iterator I = allnodes_begin(), E = allnodes_end();
6251 const SDNode *N = I;
6252 if (!N->hasOneUse() && N != getRoot().getNode())
6253 DumpNodes(N, 2, this);
6256 if (getRoot().getNode()) DumpNodes(getRoot().getNode(), 2, this);
6261 void SDNode::printr(raw_ostream &OS, const SelectionDAG *G) const {
6263 print_details(OS, G);
6266 typedef SmallPtrSet<const SDNode *, 128> VisitedSDNodeSet;
6267 static void DumpNodesr(raw_ostream &OS, const SDNode *N, unsigned indent,
6268 const SelectionDAG *G, VisitedSDNodeSet &once) {
6269 if (!once.insert(N)) // If we've been here before, return now.
6272 // Dump the current SDNode, but don't end the line yet.
6273 OS << std::string(indent, ' ');
6276 // Having printed this SDNode, walk the children:
6277 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
6278 const SDNode *child = N->getOperand(i).getNode();
6283 if (child->getNumOperands() == 0) {
6284 // This child has no grandchildren; print it inline right here.
6285 child->printr(OS, G);
6287 } else { // Just the address. FIXME: also print the child's opcode.
6289 if (unsigned RN = N->getOperand(i).getResNo())
6296 // Dump children that have grandchildren on their own line(s).
6297 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
6298 const SDNode *child = N->getOperand(i).getNode();
6299 DumpNodesr(OS, child, indent+2, G, once);
6303 void SDNode::dumpr() const {
6304 VisitedSDNodeSet once;
6305 DumpNodesr(dbgs(), this, 0, 0, once);
6308 void SDNode::dumpr(const SelectionDAG *G) const {
6309 VisitedSDNodeSet once;
6310 DumpNodesr(dbgs(), this, 0, G, once);
6314 // getAddressSpace - Return the address space this GlobalAddress belongs to.
6315 unsigned GlobalAddressSDNode::getAddressSpace() const {
6316 return getGlobal()->getType()->getAddressSpace();
6320 const Type *ConstantPoolSDNode::getType() const {
6321 if (isMachineConstantPoolEntry())
6322 return Val.MachineCPVal->getType();
6323 return Val.ConstVal->getType();
6326 bool BuildVectorSDNode::isConstantSplat(APInt &SplatValue,
6328 unsigned &SplatBitSize,
6330 unsigned MinSplatBits,
6332 EVT VT = getValueType(0);
6333 assert(VT.isVector() && "Expected a vector type");
6334 unsigned sz = VT.getSizeInBits();
6335 if (MinSplatBits > sz)
6338 SplatValue = APInt(sz, 0);
6339 SplatUndef = APInt(sz, 0);
6341 // Get the bits. Bits with undefined values (when the corresponding element
6342 // of the vector is an ISD::UNDEF value) are set in SplatUndef and cleared
6343 // in SplatValue. If any of the values are not constant, give up and return
6345 unsigned int nOps = getNumOperands();
6346 assert(nOps > 0 && "isConstantSplat has 0-size build vector");
6347 unsigned EltBitSize = VT.getVectorElementType().getSizeInBits();
6349 for (unsigned j = 0; j < nOps; ++j) {
6350 unsigned i = isBigEndian ? nOps-1-j : j;
6351 SDValue OpVal = getOperand(i);
6352 unsigned BitPos = j * EltBitSize;
6354 if (OpVal.getOpcode() == ISD::UNDEF)
6355 SplatUndef |= APInt::getBitsSet(sz, BitPos, BitPos + EltBitSize);
6356 else if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(OpVal))
6357 SplatValue |= (APInt(CN->getAPIntValue()).zextOrTrunc(EltBitSize).
6358 zextOrTrunc(sz) << BitPos);
6359 else if (ConstantFPSDNode *CN = dyn_cast<ConstantFPSDNode>(OpVal))
6360 SplatValue |= CN->getValueAPF().bitcastToAPInt().zextOrTrunc(sz) <<BitPos;
6365 // The build_vector is all constants or undefs. Find the smallest element
6366 // size that splats the vector.
6368 HasAnyUndefs = (SplatUndef != 0);
6371 unsigned HalfSize = sz / 2;
6372 APInt HighValue = APInt(SplatValue).lshr(HalfSize).trunc(HalfSize);
6373 APInt LowValue = APInt(SplatValue).trunc(HalfSize);
6374 APInt HighUndef = APInt(SplatUndef).lshr(HalfSize).trunc(HalfSize);
6375 APInt LowUndef = APInt(SplatUndef).trunc(HalfSize);
6377 // If the two halves do not match (ignoring undef bits), stop here.
6378 if ((HighValue & ~LowUndef) != (LowValue & ~HighUndef) ||
6379 MinSplatBits > HalfSize)
6382 SplatValue = HighValue | LowValue;
6383 SplatUndef = HighUndef & LowUndef;
6392 bool ShuffleVectorSDNode::isSplatMask(const int *Mask, EVT VT) {
6393 // Find the first non-undef value in the shuffle mask.
6395 for (i = 0, e = VT.getVectorNumElements(); i != e && Mask[i] < 0; ++i)
6398 assert(i != e && "VECTOR_SHUFFLE node with all undef indices!");
6400 // Make sure all remaining elements are either undef or the same as the first
6402 for (int Idx = Mask[i]; i != e; ++i)
6403 if (Mask[i] >= 0 && Mask[i] != Idx)
6409 static void checkForCyclesHelper(const SDNode *N,
6410 SmallPtrSet<const SDNode*, 32> &Visited,
6411 SmallPtrSet<const SDNode*, 32> &Checked) {
6412 // If this node has already been checked, don't check it again.
6413 if (Checked.count(N))
6416 // If a node has already been visited on this depth-first walk, reject it as
6418 if (!Visited.insert(N)) {
6419 dbgs() << "Offending node:\n";
6421 errs() << "Detected cycle in SelectionDAG\n";
6425 for(unsigned i = 0, e = N->getNumOperands(); i != e; ++i)
6426 checkForCyclesHelper(N->getOperand(i).getNode(), Visited, Checked);
6433 void llvm::checkForCycles(const llvm::SDNode *N) {
6435 assert(N && "Checking nonexistant SDNode");
6436 SmallPtrSet<const SDNode*, 32> visited;
6437 SmallPtrSet<const SDNode*, 32> checked;
6438 checkForCyclesHelper(N, visited, checked);
6442 void llvm::checkForCycles(const llvm::SelectionDAG *DAG) {
6443 checkForCycles(DAG->getRoot().getNode());