1 //===-- SelectionDAG.cpp - Implement the SelectionDAG data structures -----===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This implements the SelectionDAG class.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/CodeGen/SelectionDAG.h"
15 #include "SDNodeOrdering.h"
16 #include "SDNodeDbgValue.h"
17 #include "llvm/Constants.h"
18 #include "llvm/Analysis/DebugInfo.h"
19 #include "llvm/Analysis/ValueTracking.h"
20 #include "llvm/Function.h"
21 #include "llvm/GlobalAlias.h"
22 #include "llvm/GlobalVariable.h"
23 #include "llvm/Intrinsics.h"
24 #include "llvm/DerivedTypes.h"
25 #include "llvm/Assembly/Writer.h"
26 #include "llvm/CallingConv.h"
27 #include "llvm/CodeGen/MachineBasicBlock.h"
28 #include "llvm/CodeGen/MachineConstantPool.h"
29 #include "llvm/CodeGen/MachineFrameInfo.h"
30 #include "llvm/CodeGen/MachineModuleInfo.h"
31 #include "llvm/CodeGen/PseudoSourceValue.h"
32 #include "llvm/Target/TargetRegisterInfo.h"
33 #include "llvm/Target/TargetData.h"
34 #include "llvm/Target/TargetFrameInfo.h"
35 #include "llvm/Target/TargetLowering.h"
36 #include "llvm/Target/TargetSelectionDAGInfo.h"
37 #include "llvm/Target/TargetOptions.h"
38 #include "llvm/Target/TargetInstrInfo.h"
39 #include "llvm/Target/TargetIntrinsicInfo.h"
40 #include "llvm/Target/TargetMachine.h"
41 #include "llvm/Support/CommandLine.h"
42 #include "llvm/Support/Debug.h"
43 #include "llvm/Support/ErrorHandling.h"
44 #include "llvm/Support/ManagedStatic.h"
45 #include "llvm/Support/MathExtras.h"
46 #include "llvm/Support/raw_ostream.h"
47 #include "llvm/System/Mutex.h"
48 #include "llvm/ADT/SetVector.h"
49 #include "llvm/ADT/SmallPtrSet.h"
50 #include "llvm/ADT/SmallSet.h"
51 #include "llvm/ADT/SmallVector.h"
52 #include "llvm/ADT/StringExtras.h"
57 /// makeVTList - Return an instance of the SDVTList struct initialized with the
58 /// specified members.
59 static SDVTList makeVTList(const EVT *VTs, unsigned NumVTs) {
60 SDVTList Res = {VTs, NumVTs};
64 static const fltSemantics *EVTToAPFloatSemantics(EVT VT) {
65 switch (VT.getSimpleVT().SimpleTy) {
66 default: llvm_unreachable("Unknown FP format");
67 case MVT::f32: return &APFloat::IEEEsingle;
68 case MVT::f64: return &APFloat::IEEEdouble;
69 case MVT::f80: return &APFloat::x87DoubleExtended;
70 case MVT::f128: return &APFloat::IEEEquad;
71 case MVT::ppcf128: return &APFloat::PPCDoubleDouble;
75 SelectionDAG::DAGUpdateListener::~DAGUpdateListener() {}
77 //===----------------------------------------------------------------------===//
78 // ConstantFPSDNode Class
79 //===----------------------------------------------------------------------===//
81 /// isExactlyValue - We don't rely on operator== working on double values, as
82 /// it returns true for things that are clearly not equal, like -0.0 and 0.0.
83 /// As such, this method can be used to do an exact bit-for-bit comparison of
84 /// two floating point values.
85 bool ConstantFPSDNode::isExactlyValue(const APFloat& V) const {
86 return getValueAPF().bitwiseIsEqual(V);
89 bool ConstantFPSDNode::isValueValidForType(EVT VT,
91 assert(VT.isFloatingPoint() && "Can only convert between FP types");
93 // PPC long double cannot be converted to any other type.
94 if (VT == MVT::ppcf128 ||
95 &Val.getSemantics() == &APFloat::PPCDoubleDouble)
98 // convert modifies in place, so make a copy.
99 APFloat Val2 = APFloat(Val);
101 (void) Val2.convert(*EVTToAPFloatSemantics(VT), APFloat::rmNearestTiesToEven,
106 //===----------------------------------------------------------------------===//
108 //===----------------------------------------------------------------------===//
110 /// isBuildVectorAllOnes - Return true if the specified node is a
111 /// BUILD_VECTOR where all of the elements are ~0 or undef.
112 bool ISD::isBuildVectorAllOnes(const SDNode *N) {
113 // Look through a bit convert.
114 if (N->getOpcode() == ISD::BIT_CONVERT)
115 N = N->getOperand(0).getNode();
117 if (N->getOpcode() != ISD::BUILD_VECTOR) return false;
119 unsigned i = 0, e = N->getNumOperands();
121 // Skip over all of the undef values.
122 while (i != e && N->getOperand(i).getOpcode() == ISD::UNDEF)
125 // Do not accept an all-undef vector.
126 if (i == e) return false;
128 // Do not accept build_vectors that aren't all constants or which have non-~0
130 SDValue NotZero = N->getOperand(i);
131 if (isa<ConstantSDNode>(NotZero)) {
132 if (!cast<ConstantSDNode>(NotZero)->isAllOnesValue())
134 } else if (isa<ConstantFPSDNode>(NotZero)) {
135 if (!cast<ConstantFPSDNode>(NotZero)->getValueAPF().
136 bitcastToAPInt().isAllOnesValue())
141 // Okay, we have at least one ~0 value, check to see if the rest match or are
143 for (++i; i != e; ++i)
144 if (N->getOperand(i) != NotZero &&
145 N->getOperand(i).getOpcode() != ISD::UNDEF)
151 /// isBuildVectorAllZeros - Return true if the specified node is a
152 /// BUILD_VECTOR where all of the elements are 0 or undef.
153 bool ISD::isBuildVectorAllZeros(const SDNode *N) {
154 // Look through a bit convert.
155 if (N->getOpcode() == ISD::BIT_CONVERT)
156 N = N->getOperand(0).getNode();
158 if (N->getOpcode() != ISD::BUILD_VECTOR) return false;
160 unsigned i = 0, e = N->getNumOperands();
162 // Skip over all of the undef values.
163 while (i != e && N->getOperand(i).getOpcode() == ISD::UNDEF)
166 // Do not accept an all-undef vector.
167 if (i == e) return false;
169 // Do not accept build_vectors that aren't all constants or which have non-0
171 SDValue Zero = N->getOperand(i);
172 if (isa<ConstantSDNode>(Zero)) {
173 if (!cast<ConstantSDNode>(Zero)->isNullValue())
175 } else if (isa<ConstantFPSDNode>(Zero)) {
176 if (!cast<ConstantFPSDNode>(Zero)->getValueAPF().isPosZero())
181 // Okay, we have at least one 0 value, check to see if the rest match or are
183 for (++i; i != e; ++i)
184 if (N->getOperand(i) != Zero &&
185 N->getOperand(i).getOpcode() != ISD::UNDEF)
190 /// isScalarToVector - Return true if the specified node is a
191 /// ISD::SCALAR_TO_VECTOR node or a BUILD_VECTOR node where only the low
192 /// element is not an undef.
193 bool ISD::isScalarToVector(const SDNode *N) {
194 if (N->getOpcode() == ISD::SCALAR_TO_VECTOR)
197 if (N->getOpcode() != ISD::BUILD_VECTOR)
199 if (N->getOperand(0).getOpcode() == ISD::UNDEF)
201 unsigned NumElems = N->getNumOperands();
202 for (unsigned i = 1; i < NumElems; ++i) {
203 SDValue V = N->getOperand(i);
204 if (V.getOpcode() != ISD::UNDEF)
210 /// getSetCCSwappedOperands - Return the operation corresponding to (Y op X)
211 /// when given the operation for (X op Y).
212 ISD::CondCode ISD::getSetCCSwappedOperands(ISD::CondCode Operation) {
213 // To perform this operation, we just need to swap the L and G bits of the
215 unsigned OldL = (Operation >> 2) & 1;
216 unsigned OldG = (Operation >> 1) & 1;
217 return ISD::CondCode((Operation & ~6) | // Keep the N, U, E bits
218 (OldL << 1) | // New G bit
219 (OldG << 2)); // New L bit.
222 /// getSetCCInverse - Return the operation corresponding to !(X op Y), where
223 /// 'op' is a valid SetCC operation.
224 ISD::CondCode ISD::getSetCCInverse(ISD::CondCode Op, bool isInteger) {
225 unsigned Operation = Op;
227 Operation ^= 7; // Flip L, G, E bits, but not U.
229 Operation ^= 15; // Flip all of the condition bits.
231 if (Operation > ISD::SETTRUE2)
232 Operation &= ~8; // Don't let N and U bits get set.
234 return ISD::CondCode(Operation);
238 /// isSignedOp - For an integer comparison, return 1 if the comparison is a
239 /// signed operation and 2 if the result is an unsigned comparison. Return zero
240 /// if the operation does not depend on the sign of the input (setne and seteq).
241 static int isSignedOp(ISD::CondCode Opcode) {
243 default: llvm_unreachable("Illegal integer setcc operation!");
245 case ISD::SETNE: return 0;
249 case ISD::SETGE: return 1;
253 case ISD::SETUGE: return 2;
257 /// getSetCCOrOperation - Return the result of a logical OR between different
258 /// comparisons of identical values: ((X op1 Y) | (X op2 Y)). This function
259 /// returns SETCC_INVALID if it is not possible to represent the resultant
261 ISD::CondCode ISD::getSetCCOrOperation(ISD::CondCode Op1, ISD::CondCode Op2,
263 if (isInteger && (isSignedOp(Op1) | isSignedOp(Op2)) == 3)
264 // Cannot fold a signed integer setcc with an unsigned integer setcc.
265 return ISD::SETCC_INVALID;
267 unsigned Op = Op1 | Op2; // Combine all of the condition bits.
269 // If the N and U bits get set then the resultant comparison DOES suddenly
270 // care about orderedness, and is true when ordered.
271 if (Op > ISD::SETTRUE2)
272 Op &= ~16; // Clear the U bit if the N bit is set.
274 // Canonicalize illegal integer setcc's.
275 if (isInteger && Op == ISD::SETUNE) // e.g. SETUGT | SETULT
278 return ISD::CondCode(Op);
281 /// getSetCCAndOperation - Return the result of a logical AND between different
282 /// comparisons of identical values: ((X op1 Y) & (X op2 Y)). This
283 /// function returns zero if it is not possible to represent the resultant
285 ISD::CondCode ISD::getSetCCAndOperation(ISD::CondCode Op1, ISD::CondCode Op2,
287 if (isInteger && (isSignedOp(Op1) | isSignedOp(Op2)) == 3)
288 // Cannot fold a signed setcc with an unsigned setcc.
289 return ISD::SETCC_INVALID;
291 // Combine all of the condition bits.
292 ISD::CondCode Result = ISD::CondCode(Op1 & Op2);
294 // Canonicalize illegal integer setcc's.
298 case ISD::SETUO : Result = ISD::SETFALSE; break; // SETUGT & SETULT
299 case ISD::SETOEQ: // SETEQ & SETU[LG]E
300 case ISD::SETUEQ: Result = ISD::SETEQ ; break; // SETUGE & SETULE
301 case ISD::SETOLT: Result = ISD::SETULT ; break; // SETULT & SETNE
302 case ISD::SETOGT: Result = ISD::SETUGT ; break; // SETUGT & SETNE
309 //===----------------------------------------------------------------------===//
310 // SDNode Profile Support
311 //===----------------------------------------------------------------------===//
313 /// AddNodeIDOpcode - Add the node opcode to the NodeID data.
315 static void AddNodeIDOpcode(FoldingSetNodeID &ID, unsigned OpC) {
319 /// AddNodeIDValueTypes - Value type lists are intern'd so we can represent them
320 /// solely with their pointer.
321 static void AddNodeIDValueTypes(FoldingSetNodeID &ID, SDVTList VTList) {
322 ID.AddPointer(VTList.VTs);
325 /// AddNodeIDOperands - Various routines for adding operands to the NodeID data.
327 static void AddNodeIDOperands(FoldingSetNodeID &ID,
328 const SDValue *Ops, unsigned NumOps) {
329 for (; NumOps; --NumOps, ++Ops) {
330 ID.AddPointer(Ops->getNode());
331 ID.AddInteger(Ops->getResNo());
335 /// AddNodeIDOperands - Various routines for adding operands to the NodeID data.
337 static void AddNodeIDOperands(FoldingSetNodeID &ID,
338 const SDUse *Ops, unsigned NumOps) {
339 for (; NumOps; --NumOps, ++Ops) {
340 ID.AddPointer(Ops->getNode());
341 ID.AddInteger(Ops->getResNo());
345 static void AddNodeIDNode(FoldingSetNodeID &ID,
346 unsigned short OpC, SDVTList VTList,
347 const SDValue *OpList, unsigned N) {
348 AddNodeIDOpcode(ID, OpC);
349 AddNodeIDValueTypes(ID, VTList);
350 AddNodeIDOperands(ID, OpList, N);
353 /// AddNodeIDCustom - If this is an SDNode with special info, add this info to
355 static void AddNodeIDCustom(FoldingSetNodeID &ID, const SDNode *N) {
356 switch (N->getOpcode()) {
357 case ISD::TargetExternalSymbol:
358 case ISD::ExternalSymbol:
359 llvm_unreachable("Should only be used on nodes with operands");
360 default: break; // Normal nodes don't need extra info.
361 case ISD::TargetConstant:
363 ID.AddPointer(cast<ConstantSDNode>(N)->getConstantIntValue());
365 case ISD::TargetConstantFP:
366 case ISD::ConstantFP: {
367 ID.AddPointer(cast<ConstantFPSDNode>(N)->getConstantFPValue());
370 case ISD::TargetGlobalAddress:
371 case ISD::GlobalAddress:
372 case ISD::TargetGlobalTLSAddress:
373 case ISD::GlobalTLSAddress: {
374 const GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(N);
375 ID.AddPointer(GA->getGlobal());
376 ID.AddInteger(GA->getOffset());
377 ID.AddInteger(GA->getTargetFlags());
380 case ISD::BasicBlock:
381 ID.AddPointer(cast<BasicBlockSDNode>(N)->getBasicBlock());
384 ID.AddInteger(cast<RegisterSDNode>(N)->getReg());
388 ID.AddPointer(cast<SrcValueSDNode>(N)->getValue());
390 case ISD::FrameIndex:
391 case ISD::TargetFrameIndex:
392 ID.AddInteger(cast<FrameIndexSDNode>(N)->getIndex());
395 case ISD::TargetJumpTable:
396 ID.AddInteger(cast<JumpTableSDNode>(N)->getIndex());
397 ID.AddInteger(cast<JumpTableSDNode>(N)->getTargetFlags());
399 case ISD::ConstantPool:
400 case ISD::TargetConstantPool: {
401 const ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(N);
402 ID.AddInteger(CP->getAlignment());
403 ID.AddInteger(CP->getOffset());
404 if (CP->isMachineConstantPoolEntry())
405 CP->getMachineCPVal()->AddSelectionDAGCSEId(ID);
407 ID.AddPointer(CP->getConstVal());
408 ID.AddInteger(CP->getTargetFlags());
412 const LoadSDNode *LD = cast<LoadSDNode>(N);
413 ID.AddInteger(LD->getMemoryVT().getRawBits());
414 ID.AddInteger(LD->getRawSubclassData());
418 const StoreSDNode *ST = cast<StoreSDNode>(N);
419 ID.AddInteger(ST->getMemoryVT().getRawBits());
420 ID.AddInteger(ST->getRawSubclassData());
423 case ISD::ATOMIC_CMP_SWAP:
424 case ISD::ATOMIC_SWAP:
425 case ISD::ATOMIC_LOAD_ADD:
426 case ISD::ATOMIC_LOAD_SUB:
427 case ISD::ATOMIC_LOAD_AND:
428 case ISD::ATOMIC_LOAD_OR:
429 case ISD::ATOMIC_LOAD_XOR:
430 case ISD::ATOMIC_LOAD_NAND:
431 case ISD::ATOMIC_LOAD_MIN:
432 case ISD::ATOMIC_LOAD_MAX:
433 case ISD::ATOMIC_LOAD_UMIN:
434 case ISD::ATOMIC_LOAD_UMAX: {
435 const AtomicSDNode *AT = cast<AtomicSDNode>(N);
436 ID.AddInteger(AT->getMemoryVT().getRawBits());
437 ID.AddInteger(AT->getRawSubclassData());
440 case ISD::VECTOR_SHUFFLE: {
441 const ShuffleVectorSDNode *SVN = cast<ShuffleVectorSDNode>(N);
442 for (unsigned i = 0, e = N->getValueType(0).getVectorNumElements();
444 ID.AddInteger(SVN->getMaskElt(i));
447 case ISD::TargetBlockAddress:
448 case ISD::BlockAddress: {
449 ID.AddPointer(cast<BlockAddressSDNode>(N)->getBlockAddress());
450 ID.AddInteger(cast<BlockAddressSDNode>(N)->getTargetFlags());
453 } // end switch (N->getOpcode())
456 /// AddNodeIDNode - Generic routine for adding a nodes info to the NodeID
458 static void AddNodeIDNode(FoldingSetNodeID &ID, const SDNode *N) {
459 AddNodeIDOpcode(ID, N->getOpcode());
460 // Add the return value info.
461 AddNodeIDValueTypes(ID, N->getVTList());
462 // Add the operand info.
463 AddNodeIDOperands(ID, N->op_begin(), N->getNumOperands());
465 // Handle SDNode leafs with special info.
466 AddNodeIDCustom(ID, N);
469 /// encodeMemSDNodeFlags - Generic routine for computing a value for use in
470 /// the CSE map that carries volatility, temporalness, indexing mode, and
471 /// extension/truncation information.
473 static inline unsigned
474 encodeMemSDNodeFlags(int ConvType, ISD::MemIndexedMode AM, bool isVolatile,
475 bool isNonTemporal) {
476 assert((ConvType & 3) == ConvType &&
477 "ConvType may not require more than 2 bits!");
478 assert((AM & 7) == AM &&
479 "AM may not require more than 3 bits!");
483 (isNonTemporal << 6);
486 //===----------------------------------------------------------------------===//
487 // SelectionDAG Class
488 //===----------------------------------------------------------------------===//
490 /// doNotCSE - Return true if CSE should not be performed for this node.
491 static bool doNotCSE(SDNode *N) {
492 if (N->getValueType(0) == MVT::Flag)
493 return true; // Never CSE anything that produces a flag.
495 switch (N->getOpcode()) {
497 case ISD::HANDLENODE:
499 return true; // Never CSE these nodes.
502 // Check that remaining values produced are not flags.
503 for (unsigned i = 1, e = N->getNumValues(); i != e; ++i)
504 if (N->getValueType(i) == MVT::Flag)
505 return true; // Never CSE anything that produces a flag.
510 /// RemoveDeadNodes - This method deletes all unreachable nodes in the
512 void SelectionDAG::RemoveDeadNodes() {
513 // Create a dummy node (which is not added to allnodes), that adds a reference
514 // to the root node, preventing it from being deleted.
515 HandleSDNode Dummy(getRoot());
517 SmallVector<SDNode*, 128> DeadNodes;
519 // Add all obviously-dead nodes to the DeadNodes worklist.
520 for (allnodes_iterator I = allnodes_begin(), E = allnodes_end(); I != E; ++I)
522 DeadNodes.push_back(I);
524 RemoveDeadNodes(DeadNodes);
526 // If the root changed (e.g. it was a dead load, update the root).
527 setRoot(Dummy.getValue());
530 /// RemoveDeadNodes - This method deletes the unreachable nodes in the
531 /// given list, and any nodes that become unreachable as a result.
532 void SelectionDAG::RemoveDeadNodes(SmallVectorImpl<SDNode *> &DeadNodes,
533 DAGUpdateListener *UpdateListener) {
535 // Process the worklist, deleting the nodes and adding their uses to the
537 while (!DeadNodes.empty()) {
538 SDNode *N = DeadNodes.pop_back_val();
541 UpdateListener->NodeDeleted(N, 0);
543 // Take the node out of the appropriate CSE map.
544 RemoveNodeFromCSEMaps(N);
546 // Next, brutally remove the operand list. This is safe to do, as there are
547 // no cycles in the graph.
548 for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ) {
550 SDNode *Operand = Use.getNode();
553 // Now that we removed this operand, see if there are no uses of it left.
554 if (Operand->use_empty())
555 DeadNodes.push_back(Operand);
562 void SelectionDAG::RemoveDeadNode(SDNode *N, DAGUpdateListener *UpdateListener){
563 SmallVector<SDNode*, 16> DeadNodes(1, N);
564 RemoveDeadNodes(DeadNodes, UpdateListener);
567 void SelectionDAG::DeleteNode(SDNode *N) {
568 // First take this out of the appropriate CSE map.
569 RemoveNodeFromCSEMaps(N);
571 // Finally, remove uses due to operands of this node, remove from the
572 // AllNodes list, and delete the node.
573 DeleteNodeNotInCSEMaps(N);
576 void SelectionDAG::DeleteNodeNotInCSEMaps(SDNode *N) {
577 assert(N != AllNodes.begin() && "Cannot delete the entry node!");
578 assert(N->use_empty() && "Cannot delete a node that is not dead!");
580 // Drop all of the operands and decrement used node's use counts.
586 void SelectionDAG::DeallocateNode(SDNode *N) {
587 if (N->OperandsNeedDelete)
588 delete[] N->OperandList;
590 // Set the opcode to DELETED_NODE to help catch bugs when node
591 // memory is reallocated.
592 N->NodeType = ISD::DELETED_NODE;
594 NodeAllocator.Deallocate(AllNodes.remove(N));
596 // Remove the ordering of this node.
599 // If any of the SDDbgValue nodes refer to this SDNode, invalidate them.
600 SmallVector<SDDbgValue*, 2> &DbgVals = DbgInfo->getSDDbgValues(N);
601 for (unsigned i = 0, e = DbgVals.size(); i != e; ++i)
602 DbgVals[i]->setIsInvalidated();
605 /// RemoveNodeFromCSEMaps - Take the specified node out of the CSE map that
606 /// correspond to it. This is useful when we're about to delete or repurpose
607 /// the node. We don't want future request for structurally identical nodes
608 /// to return N anymore.
609 bool SelectionDAG::RemoveNodeFromCSEMaps(SDNode *N) {
611 switch (N->getOpcode()) {
612 case ISD::EntryToken:
613 llvm_unreachable("EntryToken should not be in CSEMaps!");
615 case ISD::HANDLENODE: return false; // noop.
617 assert(CondCodeNodes[cast<CondCodeSDNode>(N)->get()] &&
618 "Cond code doesn't exist!");
619 Erased = CondCodeNodes[cast<CondCodeSDNode>(N)->get()] != 0;
620 CondCodeNodes[cast<CondCodeSDNode>(N)->get()] = 0;
622 case ISD::ExternalSymbol:
623 Erased = ExternalSymbols.erase(cast<ExternalSymbolSDNode>(N)->getSymbol());
625 case ISD::TargetExternalSymbol: {
626 ExternalSymbolSDNode *ESN = cast<ExternalSymbolSDNode>(N);
627 Erased = TargetExternalSymbols.erase(
628 std::pair<std::string,unsigned char>(ESN->getSymbol(),
629 ESN->getTargetFlags()));
632 case ISD::VALUETYPE: {
633 EVT VT = cast<VTSDNode>(N)->getVT();
634 if (VT.isExtended()) {
635 Erased = ExtendedValueTypeNodes.erase(VT);
637 Erased = ValueTypeNodes[VT.getSimpleVT().SimpleTy] != 0;
638 ValueTypeNodes[VT.getSimpleVT().SimpleTy] = 0;
643 // Remove it from the CSE Map.
644 Erased = CSEMap.RemoveNode(N);
648 // Verify that the node was actually in one of the CSE maps, unless it has a
649 // flag result (which cannot be CSE'd) or is one of the special cases that are
650 // not subject to CSE.
651 if (!Erased && N->getValueType(N->getNumValues()-1) != MVT::Flag &&
652 !N->isMachineOpcode() && !doNotCSE(N)) {
655 llvm_unreachable("Node is not in map!");
661 /// AddModifiedNodeToCSEMaps - The specified node has been removed from the CSE
662 /// maps and modified in place. Add it back to the CSE maps, unless an identical
663 /// node already exists, in which case transfer all its users to the existing
664 /// node. This transfer can potentially trigger recursive merging.
667 SelectionDAG::AddModifiedNodeToCSEMaps(SDNode *N,
668 DAGUpdateListener *UpdateListener) {
669 // For node types that aren't CSE'd, just act as if no identical node
672 SDNode *Existing = CSEMap.GetOrInsertNode(N);
674 // If there was already an existing matching node, use ReplaceAllUsesWith
675 // to replace the dead one with the existing one. This can cause
676 // recursive merging of other unrelated nodes down the line.
677 ReplaceAllUsesWith(N, Existing, UpdateListener);
679 // N is now dead. Inform the listener if it exists and delete it.
681 UpdateListener->NodeDeleted(N, Existing);
682 DeleteNodeNotInCSEMaps(N);
687 // If the node doesn't already exist, we updated it. Inform a listener if
690 UpdateListener->NodeUpdated(N);
693 /// FindModifiedNodeSlot - Find a slot for the specified node if its operands
694 /// were replaced with those specified. If this node is never memoized,
695 /// return null, otherwise return a pointer to the slot it would take. If a
696 /// node already exists with these operands, the slot will be non-null.
697 SDNode *SelectionDAG::FindModifiedNodeSlot(SDNode *N, SDValue Op,
702 SDValue Ops[] = { Op };
704 AddNodeIDNode(ID, N->getOpcode(), N->getVTList(), Ops, 1);
705 AddNodeIDCustom(ID, N);
706 SDNode *Node = CSEMap.FindNodeOrInsertPos(ID, InsertPos);
710 /// FindModifiedNodeSlot - Find a slot for the specified node if its operands
711 /// were replaced with those specified. If this node is never memoized,
712 /// return null, otherwise return a pointer to the slot it would take. If a
713 /// node already exists with these operands, the slot will be non-null.
714 SDNode *SelectionDAG::FindModifiedNodeSlot(SDNode *N,
715 SDValue Op1, SDValue Op2,
720 SDValue Ops[] = { Op1, Op2 };
722 AddNodeIDNode(ID, N->getOpcode(), N->getVTList(), Ops, 2);
723 AddNodeIDCustom(ID, N);
724 SDNode *Node = CSEMap.FindNodeOrInsertPos(ID, InsertPos);
729 /// FindModifiedNodeSlot - Find a slot for the specified node if its operands
730 /// were replaced with those specified. If this node is never memoized,
731 /// return null, otherwise return a pointer to the slot it would take. If a
732 /// node already exists with these operands, the slot will be non-null.
733 SDNode *SelectionDAG::FindModifiedNodeSlot(SDNode *N,
734 const SDValue *Ops,unsigned NumOps,
740 AddNodeIDNode(ID, N->getOpcode(), N->getVTList(), Ops, NumOps);
741 AddNodeIDCustom(ID, N);
742 SDNode *Node = CSEMap.FindNodeOrInsertPos(ID, InsertPos);
746 /// VerifyNode - Sanity check the given node. Aborts if it is invalid.
747 void SelectionDAG::VerifyNode(SDNode *N) {
748 switch (N->getOpcode()) {
751 case ISD::BUILD_PAIR: {
752 EVT VT = N->getValueType(0);
753 assert(N->getNumValues() == 1 && "Too many results!");
754 assert(!VT.isVector() && (VT.isInteger() || VT.isFloatingPoint()) &&
755 "Wrong return type!");
756 assert(N->getNumOperands() == 2 && "Wrong number of operands!");
757 assert(N->getOperand(0).getValueType() == N->getOperand(1).getValueType() &&
758 "Mismatched operand types!");
759 assert(N->getOperand(0).getValueType().isInteger() == VT.isInteger() &&
760 "Wrong operand type!");
761 assert(VT.getSizeInBits() == 2 * N->getOperand(0).getValueSizeInBits() &&
762 "Wrong return type size");
765 case ISD::BUILD_VECTOR: {
766 assert(N->getNumValues() == 1 && "Too many results!");
767 assert(N->getValueType(0).isVector() && "Wrong return type!");
768 assert(N->getNumOperands() == N->getValueType(0).getVectorNumElements() &&
769 "Wrong number of operands!");
770 EVT EltVT = N->getValueType(0).getVectorElementType();
771 for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ++I)
772 assert((I->getValueType() == EltVT ||
773 (EltVT.isInteger() && I->getValueType().isInteger() &&
774 EltVT.bitsLE(I->getValueType()))) &&
775 "Wrong operand type!");
781 /// getEVTAlignment - Compute the default alignment value for the
784 unsigned SelectionDAG::getEVTAlignment(EVT VT) const {
785 const Type *Ty = VT == MVT::iPTR ?
786 PointerType::get(Type::getInt8Ty(*getContext()), 0) :
787 VT.getTypeForEVT(*getContext());
789 return TLI.getTargetData()->getABITypeAlignment(Ty);
792 // EntryNode could meaningfully have debug info if we can find it...
793 SelectionDAG::SelectionDAG(const TargetMachine &tm)
794 : TM(tm), TLI(*tm.getTargetLowering()), TSI(*tm.getSelectionDAGInfo()),
795 EntryNode(ISD::EntryToken, DebugLoc(), getVTList(MVT::Other)),
796 Root(getEntryNode()), Ordering(0) {
797 AllNodes.push_back(&EntryNode);
798 Ordering = new SDNodeOrdering();
799 DbgInfo = new SDDbgInfo();
802 void SelectionDAG::init(MachineFunction &mf) {
804 Context = &mf.getFunction()->getContext();
807 SelectionDAG::~SelectionDAG() {
813 void SelectionDAG::allnodes_clear() {
814 assert(&*AllNodes.begin() == &EntryNode);
815 AllNodes.remove(AllNodes.begin());
816 while (!AllNodes.empty())
817 DeallocateNode(AllNodes.begin());
820 void SelectionDAG::clear() {
822 OperandAllocator.Reset();
825 ExtendedValueTypeNodes.clear();
826 ExternalSymbols.clear();
827 TargetExternalSymbols.clear();
828 std::fill(CondCodeNodes.begin(), CondCodeNodes.end(),
829 static_cast<CondCodeSDNode*>(0));
830 std::fill(ValueTypeNodes.begin(), ValueTypeNodes.end(),
831 static_cast<SDNode*>(0));
833 EntryNode.UseList = 0;
834 AllNodes.push_back(&EntryNode);
835 Root = getEntryNode();
840 SDValue SelectionDAG::getSExtOrTrunc(SDValue Op, DebugLoc DL, EVT VT) {
841 return VT.bitsGT(Op.getValueType()) ?
842 getNode(ISD::SIGN_EXTEND, DL, VT, Op) :
843 getNode(ISD::TRUNCATE, DL, VT, Op);
846 SDValue SelectionDAG::getZExtOrTrunc(SDValue Op, DebugLoc DL, EVT VT) {
847 return VT.bitsGT(Op.getValueType()) ?
848 getNode(ISD::ZERO_EXTEND, DL, VT, Op) :
849 getNode(ISD::TRUNCATE, DL, VT, Op);
852 SDValue SelectionDAG::getZeroExtendInReg(SDValue Op, DebugLoc DL, EVT VT) {
853 assert(!VT.isVector() &&
854 "getZeroExtendInReg should use the vector element type instead of "
856 if (Op.getValueType() == VT) return Op;
857 unsigned BitWidth = Op.getValueType().getScalarType().getSizeInBits();
858 APInt Imm = APInt::getLowBitsSet(BitWidth,
860 return getNode(ISD::AND, DL, Op.getValueType(), Op,
861 getConstant(Imm, Op.getValueType()));
864 /// getNOT - Create a bitwise NOT operation as (XOR Val, -1).
866 SDValue SelectionDAG::getNOT(DebugLoc DL, SDValue Val, EVT VT) {
867 EVT EltVT = VT.getScalarType();
869 getConstant(APInt::getAllOnesValue(EltVT.getSizeInBits()), VT);
870 return getNode(ISD::XOR, DL, VT, Val, NegOne);
873 SDValue SelectionDAG::getConstant(uint64_t Val, EVT VT, bool isT) {
874 EVT EltVT = VT.getScalarType();
875 assert((EltVT.getSizeInBits() >= 64 ||
876 (uint64_t)((int64_t)Val >> EltVT.getSizeInBits()) + 1 < 2) &&
877 "getConstant with a uint64_t value that doesn't fit in the type!");
878 return getConstant(APInt(EltVT.getSizeInBits(), Val), VT, isT);
881 SDValue SelectionDAG::getConstant(const APInt &Val, EVT VT, bool isT) {
882 return getConstant(*ConstantInt::get(*Context, Val), VT, isT);
885 SDValue SelectionDAG::getConstant(const ConstantInt &Val, EVT VT, bool isT) {
886 assert(VT.isInteger() && "Cannot create FP integer constant!");
888 EVT EltVT = VT.getScalarType();
889 assert(Val.getBitWidth() == EltVT.getSizeInBits() &&
890 "APInt size does not match type size!");
892 unsigned Opc = isT ? ISD::TargetConstant : ISD::Constant;
894 AddNodeIDNode(ID, Opc, getVTList(EltVT), 0, 0);
898 if ((N = CSEMap.FindNodeOrInsertPos(ID, IP)))
900 return SDValue(N, 0);
903 N = new (NodeAllocator) ConstantSDNode(isT, &Val, EltVT);
904 CSEMap.InsertNode(N, IP);
905 AllNodes.push_back(N);
908 SDValue Result(N, 0);
910 SmallVector<SDValue, 8> Ops;
911 Ops.assign(VT.getVectorNumElements(), Result);
912 Result = getNode(ISD::BUILD_VECTOR, DebugLoc(), VT, &Ops[0], Ops.size());
917 SDValue SelectionDAG::getIntPtrConstant(uint64_t Val, bool isTarget) {
918 return getConstant(Val, TLI.getPointerTy(), isTarget);
922 SDValue SelectionDAG::getConstantFP(const APFloat& V, EVT VT, bool isTarget) {
923 return getConstantFP(*ConstantFP::get(*getContext(), V), VT, isTarget);
926 SDValue SelectionDAG::getConstantFP(const ConstantFP& V, EVT VT, bool isTarget){
927 assert(VT.isFloatingPoint() && "Cannot create integer FP constant!");
929 EVT EltVT = VT.getScalarType();
931 // Do the map lookup using the actual bit pattern for the floating point
932 // value, so that we don't have problems with 0.0 comparing equal to -0.0, and
933 // we don't have issues with SNANs.
934 unsigned Opc = isTarget ? ISD::TargetConstantFP : ISD::ConstantFP;
936 AddNodeIDNode(ID, Opc, getVTList(EltVT), 0, 0);
940 if ((N = CSEMap.FindNodeOrInsertPos(ID, IP)))
942 return SDValue(N, 0);
945 N = new (NodeAllocator) ConstantFPSDNode(isTarget, &V, EltVT);
946 CSEMap.InsertNode(N, IP);
947 AllNodes.push_back(N);
950 SDValue Result(N, 0);
952 SmallVector<SDValue, 8> Ops;
953 Ops.assign(VT.getVectorNumElements(), Result);
954 // FIXME DebugLoc info might be appropriate here
955 Result = getNode(ISD::BUILD_VECTOR, DebugLoc(), VT, &Ops[0], Ops.size());
960 SDValue SelectionDAG::getConstantFP(double Val, EVT VT, bool isTarget) {
961 EVT EltVT = VT.getScalarType();
963 return getConstantFP(APFloat((float)Val), VT, isTarget);
964 else if (EltVT==MVT::f64)
965 return getConstantFP(APFloat(Val), VT, isTarget);
966 else if (EltVT==MVT::f80 || EltVT==MVT::f128) {
968 APFloat apf = APFloat(Val);
969 apf.convert(*EVTToAPFloatSemantics(EltVT), APFloat::rmNearestTiesToEven,
971 return getConstantFP(apf, VT, isTarget);
973 assert(0 && "Unsupported type in getConstantFP");
978 SDValue SelectionDAG::getGlobalAddress(const GlobalValue *GV, DebugLoc DL,
979 EVT VT, int64_t Offset,
981 unsigned char TargetFlags) {
982 assert((TargetFlags == 0 || isTargetGA) &&
983 "Cannot set target flags on target-independent globals");
985 // Truncate (with sign-extension) the offset value to the pointer size.
986 EVT PTy = TLI.getPointerTy();
987 unsigned BitWidth = PTy.getSizeInBits();
989 Offset = (Offset << (64 - BitWidth) >> (64 - BitWidth));
991 const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV);
993 // If GV is an alias then use the aliasee for determining thread-localness.
994 if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV))
995 GVar = dyn_cast_or_null<GlobalVariable>(GA->resolveAliasedGlobal(false));
999 if (GVar && GVar->isThreadLocal())
1000 Opc = isTargetGA ? ISD::TargetGlobalTLSAddress : ISD::GlobalTLSAddress;
1002 Opc = isTargetGA ? ISD::TargetGlobalAddress : ISD::GlobalAddress;
1004 FoldingSetNodeID ID;
1005 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0);
1007 ID.AddInteger(Offset);
1008 ID.AddInteger(TargetFlags);
1010 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1011 return SDValue(E, 0);
1013 SDNode *N = new (NodeAllocator) GlobalAddressSDNode(Opc, DL, GV, VT,
1014 Offset, TargetFlags);
1015 CSEMap.InsertNode(N, IP);
1016 AllNodes.push_back(N);
1017 return SDValue(N, 0);
1020 SDValue SelectionDAG::getFrameIndex(int FI, EVT VT, bool isTarget) {
1021 unsigned Opc = isTarget ? ISD::TargetFrameIndex : ISD::FrameIndex;
1022 FoldingSetNodeID ID;
1023 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0);
1026 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1027 return SDValue(E, 0);
1029 SDNode *N = new (NodeAllocator) FrameIndexSDNode(FI, VT, isTarget);
1030 CSEMap.InsertNode(N, IP);
1031 AllNodes.push_back(N);
1032 return SDValue(N, 0);
1035 SDValue SelectionDAG::getJumpTable(int JTI, EVT VT, bool isTarget,
1036 unsigned char TargetFlags) {
1037 assert((TargetFlags == 0 || isTarget) &&
1038 "Cannot set target flags on target-independent jump tables");
1039 unsigned Opc = isTarget ? ISD::TargetJumpTable : ISD::JumpTable;
1040 FoldingSetNodeID ID;
1041 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0);
1043 ID.AddInteger(TargetFlags);
1045 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1046 return SDValue(E, 0);
1048 SDNode *N = new (NodeAllocator) JumpTableSDNode(JTI, VT, isTarget,
1050 CSEMap.InsertNode(N, IP);
1051 AllNodes.push_back(N);
1052 return SDValue(N, 0);
1055 SDValue SelectionDAG::getConstantPool(const Constant *C, EVT VT,
1056 unsigned Alignment, int Offset,
1058 unsigned char TargetFlags) {
1059 assert((TargetFlags == 0 || isTarget) &&
1060 "Cannot set target flags on target-independent globals");
1062 Alignment = TLI.getTargetData()->getPrefTypeAlignment(C->getType());
1063 unsigned Opc = isTarget ? ISD::TargetConstantPool : ISD::ConstantPool;
1064 FoldingSetNodeID ID;
1065 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0);
1066 ID.AddInteger(Alignment);
1067 ID.AddInteger(Offset);
1069 ID.AddInteger(TargetFlags);
1071 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1072 return SDValue(E, 0);
1074 SDNode *N = new (NodeAllocator) ConstantPoolSDNode(isTarget, C, VT, Offset,
1075 Alignment, TargetFlags);
1076 CSEMap.InsertNode(N, IP);
1077 AllNodes.push_back(N);
1078 return SDValue(N, 0);
1082 SDValue SelectionDAG::getConstantPool(MachineConstantPoolValue *C, EVT VT,
1083 unsigned Alignment, int Offset,
1085 unsigned char TargetFlags) {
1086 assert((TargetFlags == 0 || isTarget) &&
1087 "Cannot set target flags on target-independent globals");
1089 Alignment = TLI.getTargetData()->getPrefTypeAlignment(C->getType());
1090 unsigned Opc = isTarget ? ISD::TargetConstantPool : ISD::ConstantPool;
1091 FoldingSetNodeID ID;
1092 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0);
1093 ID.AddInteger(Alignment);
1094 ID.AddInteger(Offset);
1095 C->AddSelectionDAGCSEId(ID);
1096 ID.AddInteger(TargetFlags);
1098 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1099 return SDValue(E, 0);
1101 SDNode *N = new (NodeAllocator) ConstantPoolSDNode(isTarget, C, VT, Offset,
1102 Alignment, TargetFlags);
1103 CSEMap.InsertNode(N, IP);
1104 AllNodes.push_back(N);
1105 return SDValue(N, 0);
1108 SDValue SelectionDAG::getBasicBlock(MachineBasicBlock *MBB) {
1109 FoldingSetNodeID ID;
1110 AddNodeIDNode(ID, ISD::BasicBlock, getVTList(MVT::Other), 0, 0);
1113 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1114 return SDValue(E, 0);
1116 SDNode *N = new (NodeAllocator) BasicBlockSDNode(MBB);
1117 CSEMap.InsertNode(N, IP);
1118 AllNodes.push_back(N);
1119 return SDValue(N, 0);
1122 SDValue SelectionDAG::getValueType(EVT VT) {
1123 if (VT.isSimple() && (unsigned)VT.getSimpleVT().SimpleTy >=
1124 ValueTypeNodes.size())
1125 ValueTypeNodes.resize(VT.getSimpleVT().SimpleTy+1);
1127 SDNode *&N = VT.isExtended() ?
1128 ExtendedValueTypeNodes[VT] : ValueTypeNodes[VT.getSimpleVT().SimpleTy];
1130 if (N) return SDValue(N, 0);
1131 N = new (NodeAllocator) VTSDNode(VT);
1132 AllNodes.push_back(N);
1133 return SDValue(N, 0);
1136 SDValue SelectionDAG::getExternalSymbol(const char *Sym, EVT VT) {
1137 SDNode *&N = ExternalSymbols[Sym];
1138 if (N) return SDValue(N, 0);
1139 N = new (NodeAllocator) ExternalSymbolSDNode(false, Sym, 0, VT);
1140 AllNodes.push_back(N);
1141 return SDValue(N, 0);
1144 SDValue SelectionDAG::getTargetExternalSymbol(const char *Sym, EVT VT,
1145 unsigned char TargetFlags) {
1147 TargetExternalSymbols[std::pair<std::string,unsigned char>(Sym,
1149 if (N) return SDValue(N, 0);
1150 N = new (NodeAllocator) ExternalSymbolSDNode(true, Sym, TargetFlags, VT);
1151 AllNodes.push_back(N);
1152 return SDValue(N, 0);
1155 SDValue SelectionDAG::getCondCode(ISD::CondCode Cond) {
1156 if ((unsigned)Cond >= CondCodeNodes.size())
1157 CondCodeNodes.resize(Cond+1);
1159 if (CondCodeNodes[Cond] == 0) {
1160 CondCodeSDNode *N = new (NodeAllocator) CondCodeSDNode(Cond);
1161 CondCodeNodes[Cond] = N;
1162 AllNodes.push_back(N);
1165 return SDValue(CondCodeNodes[Cond], 0);
1168 // commuteShuffle - swaps the values of N1 and N2, and swaps all indices in
1169 // the shuffle mask M that point at N1 to point at N2, and indices that point
1170 // N2 to point at N1.
1171 static void commuteShuffle(SDValue &N1, SDValue &N2, SmallVectorImpl<int> &M) {
1173 int NElts = M.size();
1174 for (int i = 0; i != NElts; ++i) {
1182 SDValue SelectionDAG::getVectorShuffle(EVT VT, DebugLoc dl, SDValue N1,
1183 SDValue N2, const int *Mask) {
1184 assert(N1.getValueType() == N2.getValueType() && "Invalid VECTOR_SHUFFLE");
1185 assert(VT.isVector() && N1.getValueType().isVector() &&
1186 "Vector Shuffle VTs must be a vectors");
1187 assert(VT.getVectorElementType() == N1.getValueType().getVectorElementType()
1188 && "Vector Shuffle VTs must have same element type");
1190 // Canonicalize shuffle undef, undef -> undef
1191 if (N1.getOpcode() == ISD::UNDEF && N2.getOpcode() == ISD::UNDEF)
1192 return getUNDEF(VT);
1194 // Validate that all indices in Mask are within the range of the elements
1195 // input to the shuffle.
1196 unsigned NElts = VT.getVectorNumElements();
1197 SmallVector<int, 8> MaskVec;
1198 for (unsigned i = 0; i != NElts; ++i) {
1199 assert(Mask[i] < (int)(NElts * 2) && "Index out of range");
1200 MaskVec.push_back(Mask[i]);
1203 // Canonicalize shuffle v, v -> v, undef
1206 for (unsigned i = 0; i != NElts; ++i)
1207 if (MaskVec[i] >= (int)NElts) MaskVec[i] -= NElts;
1210 // Canonicalize shuffle undef, v -> v, undef. Commute the shuffle mask.
1211 if (N1.getOpcode() == ISD::UNDEF)
1212 commuteShuffle(N1, N2, MaskVec);
1214 // Canonicalize all index into lhs, -> shuffle lhs, undef
1215 // Canonicalize all index into rhs, -> shuffle rhs, undef
1216 bool AllLHS = true, AllRHS = true;
1217 bool N2Undef = N2.getOpcode() == ISD::UNDEF;
1218 for (unsigned i = 0; i != NElts; ++i) {
1219 if (MaskVec[i] >= (int)NElts) {
1224 } else if (MaskVec[i] >= 0) {
1228 if (AllLHS && AllRHS)
1229 return getUNDEF(VT);
1230 if (AllLHS && !N2Undef)
1234 commuteShuffle(N1, N2, MaskVec);
1237 // If Identity shuffle, or all shuffle in to undef, return that node.
1238 bool AllUndef = true;
1239 bool Identity = true;
1240 for (unsigned i = 0; i != NElts; ++i) {
1241 if (MaskVec[i] >= 0 && MaskVec[i] != (int)i) Identity = false;
1242 if (MaskVec[i] >= 0) AllUndef = false;
1244 if (Identity && NElts == N1.getValueType().getVectorNumElements())
1247 return getUNDEF(VT);
1249 FoldingSetNodeID ID;
1250 SDValue Ops[2] = { N1, N2 };
1251 AddNodeIDNode(ID, ISD::VECTOR_SHUFFLE, getVTList(VT), Ops, 2);
1252 for (unsigned i = 0; i != NElts; ++i)
1253 ID.AddInteger(MaskVec[i]);
1256 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1257 return SDValue(E, 0);
1259 // Allocate the mask array for the node out of the BumpPtrAllocator, since
1260 // SDNode doesn't have access to it. This memory will be "leaked" when
1261 // the node is deallocated, but recovered when the NodeAllocator is released.
1262 int *MaskAlloc = OperandAllocator.Allocate<int>(NElts);
1263 memcpy(MaskAlloc, &MaskVec[0], NElts * sizeof(int));
1265 ShuffleVectorSDNode *N =
1266 new (NodeAllocator) ShuffleVectorSDNode(VT, dl, N1, N2, MaskAlloc);
1267 CSEMap.InsertNode(N, IP);
1268 AllNodes.push_back(N);
1269 return SDValue(N, 0);
1272 SDValue SelectionDAG::getConvertRndSat(EVT VT, DebugLoc dl,
1273 SDValue Val, SDValue DTy,
1274 SDValue STy, SDValue Rnd, SDValue Sat,
1275 ISD::CvtCode Code) {
1276 // If the src and dest types are the same and the conversion is between
1277 // integer types of the same sign or two floats, no conversion is necessary.
1279 (Code == ISD::CVT_UU || Code == ISD::CVT_SS || Code == ISD::CVT_FF))
1282 FoldingSetNodeID ID;
1283 SDValue Ops[] = { Val, DTy, STy, Rnd, Sat };
1284 AddNodeIDNode(ID, ISD::CONVERT_RNDSAT, getVTList(VT), &Ops[0], 5);
1286 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1287 return SDValue(E, 0);
1289 CvtRndSatSDNode *N = new (NodeAllocator) CvtRndSatSDNode(VT, dl, Ops, 5,
1291 CSEMap.InsertNode(N, IP);
1292 AllNodes.push_back(N);
1293 return SDValue(N, 0);
1296 SDValue SelectionDAG::getRegister(unsigned RegNo, EVT VT) {
1297 FoldingSetNodeID ID;
1298 AddNodeIDNode(ID, ISD::Register, getVTList(VT), 0, 0);
1299 ID.AddInteger(RegNo);
1301 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1302 return SDValue(E, 0);
1304 SDNode *N = new (NodeAllocator) RegisterSDNode(RegNo, VT);
1305 CSEMap.InsertNode(N, IP);
1306 AllNodes.push_back(N);
1307 return SDValue(N, 0);
1310 SDValue SelectionDAG::getEHLabel(DebugLoc dl, SDValue Root, MCSymbol *Label) {
1311 FoldingSetNodeID ID;
1312 SDValue Ops[] = { Root };
1313 AddNodeIDNode(ID, ISD::EH_LABEL, getVTList(MVT::Other), &Ops[0], 1);
1314 ID.AddPointer(Label);
1316 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1317 return SDValue(E, 0);
1319 SDNode *N = new (NodeAllocator) EHLabelSDNode(dl, Root, Label);
1320 CSEMap.InsertNode(N, IP);
1321 AllNodes.push_back(N);
1322 return SDValue(N, 0);
1326 SDValue SelectionDAG::getBlockAddress(const BlockAddress *BA, EVT VT,
1328 unsigned char TargetFlags) {
1329 unsigned Opc = isTarget ? ISD::TargetBlockAddress : ISD::BlockAddress;
1331 FoldingSetNodeID ID;
1332 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0);
1334 ID.AddInteger(TargetFlags);
1336 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1337 return SDValue(E, 0);
1339 SDNode *N = new (NodeAllocator) BlockAddressSDNode(Opc, VT, BA, TargetFlags);
1340 CSEMap.InsertNode(N, IP);
1341 AllNodes.push_back(N);
1342 return SDValue(N, 0);
1345 SDValue SelectionDAG::getSrcValue(const Value *V) {
1346 assert((!V || V->getType()->isPointerTy()) &&
1347 "SrcValue is not a pointer?");
1349 FoldingSetNodeID ID;
1350 AddNodeIDNode(ID, ISD::SRCVALUE, getVTList(MVT::Other), 0, 0);
1354 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1355 return SDValue(E, 0);
1357 SDNode *N = new (NodeAllocator) SrcValueSDNode(V);
1358 CSEMap.InsertNode(N, IP);
1359 AllNodes.push_back(N);
1360 return SDValue(N, 0);
1363 /// getMDNode - Return an MDNodeSDNode which holds an MDNode.
1364 SDValue SelectionDAG::getMDNode(const MDNode *MD) {
1365 FoldingSetNodeID ID;
1366 AddNodeIDNode(ID, ISD::MDNODE_SDNODE, getVTList(MVT::Other), 0, 0);
1370 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1371 return SDValue(E, 0);
1373 SDNode *N = new (NodeAllocator) MDNodeSDNode(MD);
1374 CSEMap.InsertNode(N, IP);
1375 AllNodes.push_back(N);
1376 return SDValue(N, 0);
1380 /// getShiftAmountOperand - Return the specified value casted to
1381 /// the target's desired shift amount type.
1382 SDValue SelectionDAG::getShiftAmountOperand(SDValue Op) {
1383 EVT OpTy = Op.getValueType();
1384 MVT ShTy = TLI.getShiftAmountTy();
1385 if (OpTy == ShTy || OpTy.isVector()) return Op;
1387 ISD::NodeType Opcode = OpTy.bitsGT(ShTy) ? ISD::TRUNCATE : ISD::ZERO_EXTEND;
1388 return getNode(Opcode, Op.getDebugLoc(), ShTy, Op);
1391 /// CreateStackTemporary - Create a stack temporary, suitable for holding the
1392 /// specified value type.
1393 SDValue SelectionDAG::CreateStackTemporary(EVT VT, unsigned minAlign) {
1394 MachineFrameInfo *FrameInfo = getMachineFunction().getFrameInfo();
1395 unsigned ByteSize = VT.getStoreSize();
1396 const Type *Ty = VT.getTypeForEVT(*getContext());
1397 unsigned StackAlign =
1398 std::max((unsigned)TLI.getTargetData()->getPrefTypeAlignment(Ty), minAlign);
1400 int FrameIdx = FrameInfo->CreateStackObject(ByteSize, StackAlign, false);
1401 return getFrameIndex(FrameIdx, TLI.getPointerTy());
1404 /// CreateStackTemporary - Create a stack temporary suitable for holding
1405 /// either of the specified value types.
1406 SDValue SelectionDAG::CreateStackTemporary(EVT VT1, EVT VT2) {
1407 unsigned Bytes = std::max(VT1.getStoreSizeInBits(),
1408 VT2.getStoreSizeInBits())/8;
1409 const Type *Ty1 = VT1.getTypeForEVT(*getContext());
1410 const Type *Ty2 = VT2.getTypeForEVT(*getContext());
1411 const TargetData *TD = TLI.getTargetData();
1412 unsigned Align = std::max(TD->getPrefTypeAlignment(Ty1),
1413 TD->getPrefTypeAlignment(Ty2));
1415 MachineFrameInfo *FrameInfo = getMachineFunction().getFrameInfo();
1416 int FrameIdx = FrameInfo->CreateStackObject(Bytes, Align, false);
1417 return getFrameIndex(FrameIdx, TLI.getPointerTy());
1420 SDValue SelectionDAG::FoldSetCC(EVT VT, SDValue N1,
1421 SDValue N2, ISD::CondCode Cond, DebugLoc dl) {
1422 // These setcc operations always fold.
1426 case ISD::SETFALSE2: return getConstant(0, VT);
1428 case ISD::SETTRUE2: return getConstant(1, VT);
1440 assert(!N1.getValueType().isInteger() && "Illegal setcc for integer!");
1444 if (ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.getNode())) {
1445 const APInt &C2 = N2C->getAPIntValue();
1446 if (ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.getNode())) {
1447 const APInt &C1 = N1C->getAPIntValue();
1450 default: llvm_unreachable("Unknown integer setcc!");
1451 case ISD::SETEQ: return getConstant(C1 == C2, VT);
1452 case ISD::SETNE: return getConstant(C1 != C2, VT);
1453 case ISD::SETULT: return getConstant(C1.ult(C2), VT);
1454 case ISD::SETUGT: return getConstant(C1.ugt(C2), VT);
1455 case ISD::SETULE: return getConstant(C1.ule(C2), VT);
1456 case ISD::SETUGE: return getConstant(C1.uge(C2), VT);
1457 case ISD::SETLT: return getConstant(C1.slt(C2), VT);
1458 case ISD::SETGT: return getConstant(C1.sgt(C2), VT);
1459 case ISD::SETLE: return getConstant(C1.sle(C2), VT);
1460 case ISD::SETGE: return getConstant(C1.sge(C2), VT);
1464 if (ConstantFPSDNode *N1C = dyn_cast<ConstantFPSDNode>(N1.getNode())) {
1465 if (ConstantFPSDNode *N2C = dyn_cast<ConstantFPSDNode>(N2.getNode())) {
1466 // No compile time operations on this type yet.
1467 if (N1C->getValueType(0) == MVT::ppcf128)
1470 APFloat::cmpResult R = N1C->getValueAPF().compare(N2C->getValueAPF());
1473 case ISD::SETEQ: if (R==APFloat::cmpUnordered)
1474 return getUNDEF(VT);
1476 case ISD::SETOEQ: return getConstant(R==APFloat::cmpEqual, VT);
1477 case ISD::SETNE: if (R==APFloat::cmpUnordered)
1478 return getUNDEF(VT);
1480 case ISD::SETONE: return getConstant(R==APFloat::cmpGreaterThan ||
1481 R==APFloat::cmpLessThan, VT);
1482 case ISD::SETLT: if (R==APFloat::cmpUnordered)
1483 return getUNDEF(VT);
1485 case ISD::SETOLT: return getConstant(R==APFloat::cmpLessThan, VT);
1486 case ISD::SETGT: if (R==APFloat::cmpUnordered)
1487 return getUNDEF(VT);
1489 case ISD::SETOGT: return getConstant(R==APFloat::cmpGreaterThan, VT);
1490 case ISD::SETLE: if (R==APFloat::cmpUnordered)
1491 return getUNDEF(VT);
1493 case ISD::SETOLE: return getConstant(R==APFloat::cmpLessThan ||
1494 R==APFloat::cmpEqual, VT);
1495 case ISD::SETGE: if (R==APFloat::cmpUnordered)
1496 return getUNDEF(VT);
1498 case ISD::SETOGE: return getConstant(R==APFloat::cmpGreaterThan ||
1499 R==APFloat::cmpEqual, VT);
1500 case ISD::SETO: return getConstant(R!=APFloat::cmpUnordered, VT);
1501 case ISD::SETUO: return getConstant(R==APFloat::cmpUnordered, VT);
1502 case ISD::SETUEQ: return getConstant(R==APFloat::cmpUnordered ||
1503 R==APFloat::cmpEqual, VT);
1504 case ISD::SETUNE: return getConstant(R!=APFloat::cmpEqual, VT);
1505 case ISD::SETULT: return getConstant(R==APFloat::cmpUnordered ||
1506 R==APFloat::cmpLessThan, VT);
1507 case ISD::SETUGT: return getConstant(R==APFloat::cmpGreaterThan ||
1508 R==APFloat::cmpUnordered, VT);
1509 case ISD::SETULE: return getConstant(R!=APFloat::cmpGreaterThan, VT);
1510 case ISD::SETUGE: return getConstant(R!=APFloat::cmpLessThan, VT);
1513 // Ensure that the constant occurs on the RHS.
1514 return getSetCC(dl, VT, N2, N1, ISD::getSetCCSwappedOperands(Cond));
1518 // Could not fold it.
1522 /// SignBitIsZero - Return true if the sign bit of Op is known to be zero. We
1523 /// use this predicate to simplify operations downstream.
1524 bool SelectionDAG::SignBitIsZero(SDValue Op, unsigned Depth) const {
1525 // This predicate is not safe for vector operations.
1526 if (Op.getValueType().isVector())
1529 unsigned BitWidth = Op.getValueType().getScalarType().getSizeInBits();
1530 return MaskedValueIsZero(Op, APInt::getSignBit(BitWidth), Depth);
1533 /// MaskedValueIsZero - Return true if 'V & Mask' is known to be zero. We use
1534 /// this predicate to simplify operations downstream. Mask is known to be zero
1535 /// for bits that V cannot have.
1536 bool SelectionDAG::MaskedValueIsZero(SDValue Op, const APInt &Mask,
1537 unsigned Depth) const {
1538 APInt KnownZero, KnownOne;
1539 ComputeMaskedBits(Op, Mask, KnownZero, KnownOne, Depth);
1540 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1541 return (KnownZero & Mask) == Mask;
1544 /// ComputeMaskedBits - Determine which of the bits specified in Mask are
1545 /// known to be either zero or one and return them in the KnownZero/KnownOne
1546 /// bitsets. This code only analyzes bits in Mask, in order to short-circuit
1548 void SelectionDAG::ComputeMaskedBits(SDValue Op, const APInt &Mask,
1549 APInt &KnownZero, APInt &KnownOne,
1550 unsigned Depth) const {
1551 unsigned BitWidth = Mask.getBitWidth();
1552 assert(BitWidth == Op.getValueType().getScalarType().getSizeInBits() &&
1553 "Mask size mismatches value type size!");
1555 KnownZero = KnownOne = APInt(BitWidth, 0); // Don't know anything.
1556 if (Depth == 6 || Mask == 0)
1557 return; // Limit search depth.
1559 APInt KnownZero2, KnownOne2;
1561 switch (Op.getOpcode()) {
1563 // We know all of the bits for a constant!
1564 KnownOne = cast<ConstantSDNode>(Op)->getAPIntValue() & Mask;
1565 KnownZero = ~KnownOne & Mask;
1568 // If either the LHS or the RHS are Zero, the result is zero.
1569 ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero, KnownOne, Depth+1);
1570 ComputeMaskedBits(Op.getOperand(0), Mask & ~KnownZero,
1571 KnownZero2, KnownOne2, Depth+1);
1572 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1573 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1575 // Output known-1 bits are only known if set in both the LHS & RHS.
1576 KnownOne &= KnownOne2;
1577 // Output known-0 are known to be clear if zero in either the LHS | RHS.
1578 KnownZero |= KnownZero2;
1581 ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero, KnownOne, Depth+1);
1582 ComputeMaskedBits(Op.getOperand(0), Mask & ~KnownOne,
1583 KnownZero2, KnownOne2, Depth+1);
1584 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1585 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1587 // Output known-0 bits are only known if clear in both the LHS & RHS.
1588 KnownZero &= KnownZero2;
1589 // Output known-1 are known to be set if set in either the LHS | RHS.
1590 KnownOne |= KnownOne2;
1593 ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero, KnownOne, Depth+1);
1594 ComputeMaskedBits(Op.getOperand(0), Mask, KnownZero2, KnownOne2, Depth+1);
1595 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1596 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1598 // Output known-0 bits are known if clear or set in both the LHS & RHS.
1599 APInt KnownZeroOut = (KnownZero & KnownZero2) | (KnownOne & KnownOne2);
1600 // Output known-1 are known to be set if set in only one of the LHS, RHS.
1601 KnownOne = (KnownZero & KnownOne2) | (KnownOne & KnownZero2);
1602 KnownZero = KnownZeroOut;
1606 APInt Mask2 = APInt::getAllOnesValue(BitWidth);
1607 ComputeMaskedBits(Op.getOperand(1), Mask2, KnownZero, KnownOne, Depth+1);
1608 ComputeMaskedBits(Op.getOperand(0), Mask2, KnownZero2, KnownOne2, Depth+1);
1609 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1610 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1612 // If low bits are zero in either operand, output low known-0 bits.
1613 // Also compute a conserative estimate for high known-0 bits.
1614 // More trickiness is possible, but this is sufficient for the
1615 // interesting case of alignment computation.
1617 unsigned TrailZ = KnownZero.countTrailingOnes() +
1618 KnownZero2.countTrailingOnes();
1619 unsigned LeadZ = std::max(KnownZero.countLeadingOnes() +
1620 KnownZero2.countLeadingOnes(),
1621 BitWidth) - BitWidth;
1623 TrailZ = std::min(TrailZ, BitWidth);
1624 LeadZ = std::min(LeadZ, BitWidth);
1625 KnownZero = APInt::getLowBitsSet(BitWidth, TrailZ) |
1626 APInt::getHighBitsSet(BitWidth, LeadZ);
1631 // For the purposes of computing leading zeros we can conservatively
1632 // treat a udiv as a logical right shift by the power of 2 known to
1633 // be less than the denominator.
1634 APInt AllOnes = APInt::getAllOnesValue(BitWidth);
1635 ComputeMaskedBits(Op.getOperand(0),
1636 AllOnes, KnownZero2, KnownOne2, Depth+1);
1637 unsigned LeadZ = KnownZero2.countLeadingOnes();
1641 ComputeMaskedBits(Op.getOperand(1),
1642 AllOnes, KnownZero2, KnownOne2, Depth+1);
1643 unsigned RHSUnknownLeadingOnes = KnownOne2.countLeadingZeros();
1644 if (RHSUnknownLeadingOnes != BitWidth)
1645 LeadZ = std::min(BitWidth,
1646 LeadZ + BitWidth - RHSUnknownLeadingOnes - 1);
1648 KnownZero = APInt::getHighBitsSet(BitWidth, LeadZ) & Mask;
1652 ComputeMaskedBits(Op.getOperand(2), Mask, KnownZero, KnownOne, Depth+1);
1653 ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero2, KnownOne2, Depth+1);
1654 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1655 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1657 // Only known if known in both the LHS and RHS.
1658 KnownOne &= KnownOne2;
1659 KnownZero &= KnownZero2;
1661 case ISD::SELECT_CC:
1662 ComputeMaskedBits(Op.getOperand(3), Mask, KnownZero, KnownOne, Depth+1);
1663 ComputeMaskedBits(Op.getOperand(2), Mask, KnownZero2, KnownOne2, Depth+1);
1664 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1665 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1667 // Only known if known in both the LHS and RHS.
1668 KnownOne &= KnownOne2;
1669 KnownZero &= KnownZero2;
1677 if (Op.getResNo() != 1)
1679 // The boolean result conforms to getBooleanContents. Fall through.
1681 // If we know the result of a setcc has the top bits zero, use this info.
1682 if (TLI.getBooleanContents() == TargetLowering::ZeroOrOneBooleanContent &&
1684 KnownZero |= APInt::getHighBitsSet(BitWidth, BitWidth - 1);
1687 // (shl X, C1) & C2 == 0 iff (X & C2 >>u C1) == 0
1688 if (ConstantSDNode *SA = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
1689 unsigned ShAmt = SA->getZExtValue();
1691 // If the shift count is an invalid immediate, don't do anything.
1692 if (ShAmt >= BitWidth)
1695 ComputeMaskedBits(Op.getOperand(0), Mask.lshr(ShAmt),
1696 KnownZero, KnownOne, Depth+1);
1697 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1698 KnownZero <<= ShAmt;
1700 // low bits known zero.
1701 KnownZero |= APInt::getLowBitsSet(BitWidth, ShAmt);
1705 // (ushr X, C1) & C2 == 0 iff (-1 >> C1) & C2 == 0
1706 if (ConstantSDNode *SA = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
1707 unsigned ShAmt = SA->getZExtValue();
1709 // If the shift count is an invalid immediate, don't do anything.
1710 if (ShAmt >= BitWidth)
1713 ComputeMaskedBits(Op.getOperand(0), (Mask << ShAmt),
1714 KnownZero, KnownOne, Depth+1);
1715 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1716 KnownZero = KnownZero.lshr(ShAmt);
1717 KnownOne = KnownOne.lshr(ShAmt);
1719 APInt HighBits = APInt::getHighBitsSet(BitWidth, ShAmt) & Mask;
1720 KnownZero |= HighBits; // High bits known zero.
1724 if (ConstantSDNode *SA = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
1725 unsigned ShAmt = SA->getZExtValue();
1727 // If the shift count is an invalid immediate, don't do anything.
1728 if (ShAmt >= BitWidth)
1731 APInt InDemandedMask = (Mask << ShAmt);
1732 // If any of the demanded bits are produced by the sign extension, we also
1733 // demand the input sign bit.
1734 APInt HighBits = APInt::getHighBitsSet(BitWidth, ShAmt) & Mask;
1735 if (HighBits.getBoolValue())
1736 InDemandedMask |= APInt::getSignBit(BitWidth);
1738 ComputeMaskedBits(Op.getOperand(0), InDemandedMask, KnownZero, KnownOne,
1740 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1741 KnownZero = KnownZero.lshr(ShAmt);
1742 KnownOne = KnownOne.lshr(ShAmt);
1744 // Handle the sign bits.
1745 APInt SignBit = APInt::getSignBit(BitWidth);
1746 SignBit = SignBit.lshr(ShAmt); // Adjust to where it is now in the mask.
1748 if (KnownZero.intersects(SignBit)) {
1749 KnownZero |= HighBits; // New bits are known zero.
1750 } else if (KnownOne.intersects(SignBit)) {
1751 KnownOne |= HighBits; // New bits are known one.
1755 case ISD::SIGN_EXTEND_INREG: {
1756 EVT EVT = cast<VTSDNode>(Op.getOperand(1))->getVT();
1757 unsigned EBits = EVT.getScalarType().getSizeInBits();
1759 // Sign extension. Compute the demanded bits in the result that are not
1760 // present in the input.
1761 APInt NewBits = APInt::getHighBitsSet(BitWidth, BitWidth - EBits) & Mask;
1763 APInt InSignBit = APInt::getSignBit(EBits);
1764 APInt InputDemandedBits = Mask & APInt::getLowBitsSet(BitWidth, EBits);
1766 // If the sign extended bits are demanded, we know that the sign
1768 InSignBit.zext(BitWidth);
1769 if (NewBits.getBoolValue())
1770 InputDemandedBits |= InSignBit;
1772 ComputeMaskedBits(Op.getOperand(0), InputDemandedBits,
1773 KnownZero, KnownOne, Depth+1);
1774 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1776 // If the sign bit of the input is known set or clear, then we know the
1777 // top bits of the result.
1778 if (KnownZero.intersects(InSignBit)) { // Input sign bit known clear
1779 KnownZero |= NewBits;
1780 KnownOne &= ~NewBits;
1781 } else if (KnownOne.intersects(InSignBit)) { // Input sign bit known set
1782 KnownOne |= NewBits;
1783 KnownZero &= ~NewBits;
1784 } else { // Input sign bit unknown
1785 KnownZero &= ~NewBits;
1786 KnownOne &= ~NewBits;
1793 unsigned LowBits = Log2_32(BitWidth)+1;
1794 KnownZero = APInt::getHighBitsSet(BitWidth, BitWidth - LowBits);
1799 if (ISD::isZEXTLoad(Op.getNode())) {
1800 LoadSDNode *LD = cast<LoadSDNode>(Op);
1801 EVT VT = LD->getMemoryVT();
1802 unsigned MemBits = VT.getScalarType().getSizeInBits();
1803 KnownZero |= APInt::getHighBitsSet(BitWidth, BitWidth - MemBits) & Mask;
1807 case ISD::ZERO_EXTEND: {
1808 EVT InVT = Op.getOperand(0).getValueType();
1809 unsigned InBits = InVT.getScalarType().getSizeInBits();
1810 APInt NewBits = APInt::getHighBitsSet(BitWidth, BitWidth - InBits) & Mask;
1811 APInt InMask = Mask;
1812 InMask.trunc(InBits);
1813 KnownZero.trunc(InBits);
1814 KnownOne.trunc(InBits);
1815 ComputeMaskedBits(Op.getOperand(0), InMask, KnownZero, KnownOne, Depth+1);
1816 KnownZero.zext(BitWidth);
1817 KnownOne.zext(BitWidth);
1818 KnownZero |= NewBits;
1821 case ISD::SIGN_EXTEND: {
1822 EVT InVT = Op.getOperand(0).getValueType();
1823 unsigned InBits = InVT.getScalarType().getSizeInBits();
1824 APInt InSignBit = APInt::getSignBit(InBits);
1825 APInt NewBits = APInt::getHighBitsSet(BitWidth, BitWidth - InBits) & Mask;
1826 APInt InMask = Mask;
1827 InMask.trunc(InBits);
1829 // If any of the sign extended bits are demanded, we know that the sign
1830 // bit is demanded. Temporarily set this bit in the mask for our callee.
1831 if (NewBits.getBoolValue())
1832 InMask |= InSignBit;
1834 KnownZero.trunc(InBits);
1835 KnownOne.trunc(InBits);
1836 ComputeMaskedBits(Op.getOperand(0), InMask, KnownZero, KnownOne, Depth+1);
1838 // Note if the sign bit is known to be zero or one.
1839 bool SignBitKnownZero = KnownZero.isNegative();
1840 bool SignBitKnownOne = KnownOne.isNegative();
1841 assert(!(SignBitKnownZero && SignBitKnownOne) &&
1842 "Sign bit can't be known to be both zero and one!");
1844 // If the sign bit wasn't actually demanded by our caller, we don't
1845 // want it set in the KnownZero and KnownOne result values. Reset the
1846 // mask and reapply it to the result values.
1848 InMask.trunc(InBits);
1849 KnownZero &= InMask;
1852 KnownZero.zext(BitWidth);
1853 KnownOne.zext(BitWidth);
1855 // If the sign bit is known zero or one, the top bits match.
1856 if (SignBitKnownZero)
1857 KnownZero |= NewBits;
1858 else if (SignBitKnownOne)
1859 KnownOne |= NewBits;
1862 case ISD::ANY_EXTEND: {
1863 EVT InVT = Op.getOperand(0).getValueType();
1864 unsigned InBits = InVT.getScalarType().getSizeInBits();
1865 APInt InMask = Mask;
1866 InMask.trunc(InBits);
1867 KnownZero.trunc(InBits);
1868 KnownOne.trunc(InBits);
1869 ComputeMaskedBits(Op.getOperand(0), InMask, KnownZero, KnownOne, Depth+1);
1870 KnownZero.zext(BitWidth);
1871 KnownOne.zext(BitWidth);
1874 case ISD::TRUNCATE: {
1875 EVT InVT = Op.getOperand(0).getValueType();
1876 unsigned InBits = InVT.getScalarType().getSizeInBits();
1877 APInt InMask = Mask;
1878 InMask.zext(InBits);
1879 KnownZero.zext(InBits);
1880 KnownOne.zext(InBits);
1881 ComputeMaskedBits(Op.getOperand(0), InMask, KnownZero, KnownOne, Depth+1);
1882 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1883 KnownZero.trunc(BitWidth);
1884 KnownOne.trunc(BitWidth);
1887 case ISD::AssertZext: {
1888 EVT VT = cast<VTSDNode>(Op.getOperand(1))->getVT();
1889 APInt InMask = APInt::getLowBitsSet(BitWidth, VT.getSizeInBits());
1890 ComputeMaskedBits(Op.getOperand(0), Mask & InMask, KnownZero,
1892 KnownZero |= (~InMask) & Mask;
1896 // All bits are zero except the low bit.
1897 KnownZero = APInt::getHighBitsSet(BitWidth, BitWidth - 1);
1901 if (ConstantSDNode *CLHS = dyn_cast<ConstantSDNode>(Op.getOperand(0))) {
1902 // We know that the top bits of C-X are clear if X contains less bits
1903 // than C (i.e. no wrap-around can happen). For example, 20-X is
1904 // positive if we can prove that X is >= 0 and < 16.
1905 if (CLHS->getAPIntValue().isNonNegative()) {
1906 unsigned NLZ = (CLHS->getAPIntValue()+1).countLeadingZeros();
1907 // NLZ can't be BitWidth with no sign bit
1908 APInt MaskV = APInt::getHighBitsSet(BitWidth, NLZ+1);
1909 ComputeMaskedBits(Op.getOperand(1), MaskV, KnownZero2, KnownOne2,
1912 // If all of the MaskV bits are known to be zero, then we know the
1913 // output top bits are zero, because we now know that the output is
1915 if ((KnownZero2 & MaskV) == MaskV) {
1916 unsigned NLZ2 = CLHS->getAPIntValue().countLeadingZeros();
1917 // Top bits known zero.
1918 KnownZero = APInt::getHighBitsSet(BitWidth, NLZ2) & Mask;
1925 // Output known-0 bits are known if clear or set in both the low clear bits
1926 // common to both LHS & RHS. For example, 8+(X<<3) is known to have the
1927 // low 3 bits clear.
1928 APInt Mask2 = APInt::getLowBitsSet(BitWidth,
1929 BitWidth - Mask.countLeadingZeros());
1930 ComputeMaskedBits(Op.getOperand(0), Mask2, KnownZero2, KnownOne2, Depth+1);
1931 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1932 unsigned KnownZeroOut = KnownZero2.countTrailingOnes();
1934 ComputeMaskedBits(Op.getOperand(1), Mask2, KnownZero2, KnownOne2, Depth+1);
1935 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1936 KnownZeroOut = std::min(KnownZeroOut,
1937 KnownZero2.countTrailingOnes());
1939 KnownZero |= APInt::getLowBitsSet(BitWidth, KnownZeroOut);
1943 if (ConstantSDNode *Rem = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
1944 const APInt &RA = Rem->getAPIntValue().abs();
1945 if (RA.isPowerOf2()) {
1946 APInt LowBits = RA - 1;
1947 APInt Mask2 = LowBits | APInt::getSignBit(BitWidth);
1948 ComputeMaskedBits(Op.getOperand(0), Mask2,KnownZero2,KnownOne2,Depth+1);
1950 // The low bits of the first operand are unchanged by the srem.
1951 KnownZero = KnownZero2 & LowBits;
1952 KnownOne = KnownOne2 & LowBits;
1954 // If the first operand is non-negative or has all low bits zero, then
1955 // the upper bits are all zero.
1956 if (KnownZero2[BitWidth-1] || ((KnownZero2 & LowBits) == LowBits))
1957 KnownZero |= ~LowBits;
1959 // If the first operand is negative and not all low bits are zero, then
1960 // the upper bits are all one.
1961 if (KnownOne2[BitWidth-1] && ((KnownOne2 & LowBits) != 0))
1962 KnownOne |= ~LowBits;
1967 assert((KnownZero & KnownOne) == 0&&"Bits known to be one AND zero?");
1972 if (ConstantSDNode *Rem = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
1973 const APInt &RA = Rem->getAPIntValue();
1974 if (RA.isPowerOf2()) {
1975 APInt LowBits = (RA - 1);
1976 APInt Mask2 = LowBits & Mask;
1977 KnownZero |= ~LowBits & Mask;
1978 ComputeMaskedBits(Op.getOperand(0), Mask2, KnownZero, KnownOne,Depth+1);
1979 assert((KnownZero & KnownOne) == 0&&"Bits known to be one AND zero?");
1984 // Since the result is less than or equal to either operand, any leading
1985 // zero bits in either operand must also exist in the result.
1986 APInt AllOnes = APInt::getAllOnesValue(BitWidth);
1987 ComputeMaskedBits(Op.getOperand(0), AllOnes, KnownZero, KnownOne,
1989 ComputeMaskedBits(Op.getOperand(1), AllOnes, KnownZero2, KnownOne2,
1992 uint32_t Leaders = std::max(KnownZero.countLeadingOnes(),
1993 KnownZero2.countLeadingOnes());
1995 KnownZero = APInt::getHighBitsSet(BitWidth, Leaders) & Mask;
1999 // Allow the target to implement this method for its nodes.
2000 if (Op.getOpcode() >= ISD::BUILTIN_OP_END) {
2001 case ISD::INTRINSIC_WO_CHAIN:
2002 case ISD::INTRINSIC_W_CHAIN:
2003 case ISD::INTRINSIC_VOID:
2004 TLI.computeMaskedBitsForTargetNode(Op, Mask, KnownZero, KnownOne, *this,
2011 /// ComputeNumSignBits - Return the number of times the sign bit of the
2012 /// register is replicated into the other bits. We know that at least 1 bit
2013 /// is always equal to the sign bit (itself), but other cases can give us
2014 /// information. For example, immediately after an "SRA X, 2", we know that
2015 /// the top 3 bits are all equal to each other, so we return 3.
2016 unsigned SelectionDAG::ComputeNumSignBits(SDValue Op, unsigned Depth) const{
2017 EVT VT = Op.getValueType();
2018 assert(VT.isInteger() && "Invalid VT!");
2019 unsigned VTBits = VT.getScalarType().getSizeInBits();
2021 unsigned FirstAnswer = 1;
2024 return 1; // Limit search depth.
2026 switch (Op.getOpcode()) {
2028 case ISD::AssertSext:
2029 Tmp = cast<VTSDNode>(Op.getOperand(1))->getVT().getSizeInBits();
2030 return VTBits-Tmp+1;
2031 case ISD::AssertZext:
2032 Tmp = cast<VTSDNode>(Op.getOperand(1))->getVT().getSizeInBits();
2035 case ISD::Constant: {
2036 const APInt &Val = cast<ConstantSDNode>(Op)->getAPIntValue();
2037 // If negative, return # leading ones.
2038 if (Val.isNegative())
2039 return Val.countLeadingOnes();
2041 // Return # leading zeros.
2042 return Val.countLeadingZeros();
2045 case ISD::SIGN_EXTEND:
2046 Tmp = VTBits-Op.getOperand(0).getValueType().getScalarType().getSizeInBits();
2047 return ComputeNumSignBits(Op.getOperand(0), Depth+1) + Tmp;
2049 case ISD::SIGN_EXTEND_INREG:
2050 // Max of the input and what this extends.
2052 cast<VTSDNode>(Op.getOperand(1))->getVT().getScalarType().getSizeInBits();
2055 Tmp2 = ComputeNumSignBits(Op.getOperand(0), Depth+1);
2056 return std::max(Tmp, Tmp2);
2059 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
2060 // SRA X, C -> adds C sign bits.
2061 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
2062 Tmp += C->getZExtValue();
2063 if (Tmp > VTBits) Tmp = VTBits;
2067 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
2068 // shl destroys sign bits.
2069 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
2070 if (C->getZExtValue() >= VTBits || // Bad shift.
2071 C->getZExtValue() >= Tmp) break; // Shifted all sign bits out.
2072 return Tmp - C->getZExtValue();
2077 case ISD::XOR: // NOT is handled here.
2078 // Logical binary ops preserve the number of sign bits at the worst.
2079 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
2081 Tmp2 = ComputeNumSignBits(Op.getOperand(1), Depth+1);
2082 FirstAnswer = std::min(Tmp, Tmp2);
2083 // We computed what we know about the sign bits as our first
2084 // answer. Now proceed to the generic code that uses
2085 // ComputeMaskedBits, and pick whichever answer is better.
2090 Tmp = ComputeNumSignBits(Op.getOperand(1), Depth+1);
2091 if (Tmp == 1) return 1; // Early out.
2092 Tmp2 = ComputeNumSignBits(Op.getOperand(2), Depth+1);
2093 return std::min(Tmp, Tmp2);
2101 if (Op.getResNo() != 1)
2103 // The boolean result conforms to getBooleanContents. Fall through.
2105 // If setcc returns 0/-1, all bits are sign bits.
2106 if (TLI.getBooleanContents() ==
2107 TargetLowering::ZeroOrNegativeOneBooleanContent)
2112 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
2113 unsigned RotAmt = C->getZExtValue() & (VTBits-1);
2115 // Handle rotate right by N like a rotate left by 32-N.
2116 if (Op.getOpcode() == ISD::ROTR)
2117 RotAmt = (VTBits-RotAmt) & (VTBits-1);
2119 // If we aren't rotating out all of the known-in sign bits, return the
2120 // number that are left. This handles rotl(sext(x), 1) for example.
2121 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
2122 if (Tmp > RotAmt+1) return Tmp-RotAmt;
2126 // Add can have at most one carry bit. Thus we know that the output
2127 // is, at worst, one more bit than the inputs.
2128 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
2129 if (Tmp == 1) return 1; // Early out.
2131 // Special case decrementing a value (ADD X, -1):
2132 if (ConstantSDNode *CRHS = dyn_cast<ConstantSDNode>(Op.getOperand(1)))
2133 if (CRHS->isAllOnesValue()) {
2134 APInt KnownZero, KnownOne;
2135 APInt Mask = APInt::getAllOnesValue(VTBits);
2136 ComputeMaskedBits(Op.getOperand(0), Mask, KnownZero, KnownOne, Depth+1);
2138 // If the input is known to be 0 or 1, the output is 0/-1, which is all
2140 if ((KnownZero | APInt(VTBits, 1)) == Mask)
2143 // If we are subtracting one from a positive number, there is no carry
2144 // out of the result.
2145 if (KnownZero.isNegative())
2149 Tmp2 = ComputeNumSignBits(Op.getOperand(1), Depth+1);
2150 if (Tmp2 == 1) return 1;
2151 return std::min(Tmp, Tmp2)-1;
2155 Tmp2 = ComputeNumSignBits(Op.getOperand(1), Depth+1);
2156 if (Tmp2 == 1) return 1;
2159 if (ConstantSDNode *CLHS = dyn_cast<ConstantSDNode>(Op.getOperand(0)))
2160 if (CLHS->isNullValue()) {
2161 APInt KnownZero, KnownOne;
2162 APInt Mask = APInt::getAllOnesValue(VTBits);
2163 ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero, KnownOne, Depth+1);
2164 // If the input is known to be 0 or 1, the output is 0/-1, which is all
2166 if ((KnownZero | APInt(VTBits, 1)) == Mask)
2169 // If the input is known to be positive (the sign bit is known clear),
2170 // the output of the NEG has the same number of sign bits as the input.
2171 if (KnownZero.isNegative())
2174 // Otherwise, we treat this like a SUB.
2177 // Sub can have at most one carry bit. Thus we know that the output
2178 // is, at worst, one more bit than the inputs.
2179 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
2180 if (Tmp == 1) return 1; // Early out.
2181 return std::min(Tmp, Tmp2)-1;
2184 // FIXME: it's tricky to do anything useful for this, but it is an important
2185 // case for targets like X86.
2189 // Handle LOADX separately here. EXTLOAD case will fallthrough.
2190 if (Op.getOpcode() == ISD::LOAD) {
2191 LoadSDNode *LD = cast<LoadSDNode>(Op);
2192 unsigned ExtType = LD->getExtensionType();
2195 case ISD::SEXTLOAD: // '17' bits known
2196 Tmp = LD->getMemoryVT().getScalarType().getSizeInBits();
2197 return VTBits-Tmp+1;
2198 case ISD::ZEXTLOAD: // '16' bits known
2199 Tmp = LD->getMemoryVT().getScalarType().getSizeInBits();
2204 // Allow the target to implement this method for its nodes.
2205 if (Op.getOpcode() >= ISD::BUILTIN_OP_END ||
2206 Op.getOpcode() == ISD::INTRINSIC_WO_CHAIN ||
2207 Op.getOpcode() == ISD::INTRINSIC_W_CHAIN ||
2208 Op.getOpcode() == ISD::INTRINSIC_VOID) {
2209 unsigned NumBits = TLI.ComputeNumSignBitsForTargetNode(Op, Depth);
2210 if (NumBits > 1) FirstAnswer = std::max(FirstAnswer, NumBits);
2213 // Finally, if we can prove that the top bits of the result are 0's or 1's,
2214 // use this information.
2215 APInt KnownZero, KnownOne;
2216 APInt Mask = APInt::getAllOnesValue(VTBits);
2217 ComputeMaskedBits(Op, Mask, KnownZero, KnownOne, Depth);
2219 if (KnownZero.isNegative()) { // sign bit is 0
2221 } else if (KnownOne.isNegative()) { // sign bit is 1;
2228 // Okay, we know that the sign bit in Mask is set. Use CLZ to determine
2229 // the number of identical bits in the top of the input value.
2231 Mask <<= Mask.getBitWidth()-VTBits;
2232 // Return # leading zeros. We use 'min' here in case Val was zero before
2233 // shifting. We don't want to return '64' as for an i32 "0".
2234 return std::max(FirstAnswer, std::min(VTBits, Mask.countLeadingZeros()));
2237 bool SelectionDAG::isKnownNeverNaN(SDValue Op) const {
2238 // If we're told that NaNs won't happen, assume they won't.
2242 // If the value is a constant, we can obviously see if it is a NaN or not.
2243 if (const ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(Op))
2244 return !C->getValueAPF().isNaN();
2246 // TODO: Recognize more cases here.
2251 bool SelectionDAG::isKnownNeverZero(SDValue Op) const {
2252 // If the value is a constant, we can obviously see if it is a zero or not.
2253 if (const ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(Op))
2254 return !C->isZero();
2256 // TODO: Recognize more cases here.
2261 bool SelectionDAG::isEqualTo(SDValue A, SDValue B) const {
2262 // Check the obvious case.
2263 if (A == B) return true;
2265 // For for negative and positive zero.
2266 if (const ConstantFPSDNode *CA = dyn_cast<ConstantFPSDNode>(A))
2267 if (const ConstantFPSDNode *CB = dyn_cast<ConstantFPSDNode>(B))
2268 if (CA->isZero() && CB->isZero()) return true;
2270 // Otherwise they may not be equal.
2274 bool SelectionDAG::isVerifiedDebugInfoDesc(SDValue Op) const {
2275 GlobalAddressSDNode *GA = dyn_cast<GlobalAddressSDNode>(Op);
2276 if (!GA) return false;
2277 if (GA->getOffset() != 0) return false;
2278 const GlobalVariable *GV = dyn_cast<GlobalVariable>(GA->getGlobal());
2279 if (!GV) return false;
2280 return MF->getMMI().hasDebugInfo();
2284 /// getNode - Gets or creates the specified node.
2286 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT) {
2287 FoldingSetNodeID ID;
2288 AddNodeIDNode(ID, Opcode, getVTList(VT), 0, 0);
2290 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
2291 return SDValue(E, 0);
2293 SDNode *N = new (NodeAllocator) SDNode(Opcode, DL, getVTList(VT));
2294 CSEMap.InsertNode(N, IP);
2296 AllNodes.push_back(N);
2300 return SDValue(N, 0);
2303 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL,
2304 EVT VT, SDValue Operand) {
2305 // Constant fold unary operations with an integer constant operand.
2306 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Operand.getNode())) {
2307 const APInt &Val = C->getAPIntValue();
2310 case ISD::SIGN_EXTEND:
2311 return getConstant(APInt(Val).sextOrTrunc(VT.getSizeInBits()), VT);
2312 case ISD::ANY_EXTEND:
2313 case ISD::ZERO_EXTEND:
2315 return getConstant(APInt(Val).zextOrTrunc(VT.getSizeInBits()), VT);
2316 case ISD::UINT_TO_FP:
2317 case ISD::SINT_TO_FP: {
2318 const uint64_t zero[] = {0, 0};
2319 // No compile time operations on ppcf128.
2320 if (VT == MVT::ppcf128) break;
2321 APFloat apf = APFloat(APInt(VT.getSizeInBits(), 2, zero));
2322 (void)apf.convertFromAPInt(Val,
2323 Opcode==ISD::SINT_TO_FP,
2324 APFloat::rmNearestTiesToEven);
2325 return getConstantFP(apf, VT);
2327 case ISD::BIT_CONVERT:
2328 if (VT == MVT::f32 && C->getValueType(0) == MVT::i32)
2329 return getConstantFP(Val.bitsToFloat(), VT);
2330 else if (VT == MVT::f64 && C->getValueType(0) == MVT::i64)
2331 return getConstantFP(Val.bitsToDouble(), VT);
2334 return getConstant(Val.byteSwap(), VT);
2336 return getConstant(Val.countPopulation(), VT);
2338 return getConstant(Val.countLeadingZeros(), VT);
2340 return getConstant(Val.countTrailingZeros(), VT);
2344 // Constant fold unary operations with a floating point constant operand.
2345 if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(Operand.getNode())) {
2346 APFloat V = C->getValueAPF(); // make copy
2347 if (VT != MVT::ppcf128 && Operand.getValueType() != MVT::ppcf128) {
2351 return getConstantFP(V, VT);
2354 return getConstantFP(V, VT);
2356 case ISD::FP_EXTEND: {
2358 // This can return overflow, underflow, or inexact; we don't care.
2359 // FIXME need to be more flexible about rounding mode.
2360 (void)V.convert(*EVTToAPFloatSemantics(VT),
2361 APFloat::rmNearestTiesToEven, &ignored);
2362 return getConstantFP(V, VT);
2364 case ISD::FP_TO_SINT:
2365 case ISD::FP_TO_UINT: {
2368 assert(integerPartWidth >= 64);
2369 // FIXME need to be more flexible about rounding mode.
2370 APFloat::opStatus s = V.convertToInteger(x, VT.getSizeInBits(),
2371 Opcode==ISD::FP_TO_SINT,
2372 APFloat::rmTowardZero, &ignored);
2373 if (s==APFloat::opInvalidOp) // inexact is OK, in fact usual
2375 APInt api(VT.getSizeInBits(), 2, x);
2376 return getConstant(api, VT);
2378 case ISD::BIT_CONVERT:
2379 if (VT == MVT::i32 && C->getValueType(0) == MVT::f32)
2380 return getConstant((uint32_t)V.bitcastToAPInt().getZExtValue(), VT);
2381 else if (VT == MVT::i64 && C->getValueType(0) == MVT::f64)
2382 return getConstant(V.bitcastToAPInt().getZExtValue(), VT);
2388 unsigned OpOpcode = Operand.getNode()->getOpcode();
2390 case ISD::TokenFactor:
2391 case ISD::MERGE_VALUES:
2392 case ISD::CONCAT_VECTORS:
2393 return Operand; // Factor, merge or concat of one node? No need.
2394 case ISD::FP_ROUND: llvm_unreachable("Invalid method to make FP_ROUND node");
2395 case ISD::FP_EXTEND:
2396 assert(VT.isFloatingPoint() &&
2397 Operand.getValueType().isFloatingPoint() && "Invalid FP cast!");
2398 if (Operand.getValueType() == VT) return Operand; // noop conversion.
2399 assert((!VT.isVector() ||
2400 VT.getVectorNumElements() ==
2401 Operand.getValueType().getVectorNumElements()) &&
2402 "Vector element count mismatch!");
2403 if (Operand.getOpcode() == ISD::UNDEF)
2404 return getUNDEF(VT);
2406 case ISD::SIGN_EXTEND:
2407 assert(VT.isInteger() && Operand.getValueType().isInteger() &&
2408 "Invalid SIGN_EXTEND!");
2409 if (Operand.getValueType() == VT) return Operand; // noop extension
2410 assert(Operand.getValueType().getScalarType().bitsLT(VT.getScalarType()) &&
2411 "Invalid sext node, dst < src!");
2412 assert((!VT.isVector() ||
2413 VT.getVectorNumElements() ==
2414 Operand.getValueType().getVectorNumElements()) &&
2415 "Vector element count mismatch!");
2416 if (OpOpcode == ISD::SIGN_EXTEND || OpOpcode == ISD::ZERO_EXTEND)
2417 return getNode(OpOpcode, DL, VT, Operand.getNode()->getOperand(0));
2419 case ISD::ZERO_EXTEND:
2420 assert(VT.isInteger() && Operand.getValueType().isInteger() &&
2421 "Invalid ZERO_EXTEND!");
2422 if (Operand.getValueType() == VT) return Operand; // noop extension
2423 assert(Operand.getValueType().getScalarType().bitsLT(VT.getScalarType()) &&
2424 "Invalid zext node, dst < src!");
2425 assert((!VT.isVector() ||
2426 VT.getVectorNumElements() ==
2427 Operand.getValueType().getVectorNumElements()) &&
2428 "Vector element count mismatch!");
2429 if (OpOpcode == ISD::ZERO_EXTEND) // (zext (zext x)) -> (zext x)
2430 return getNode(ISD::ZERO_EXTEND, DL, VT,
2431 Operand.getNode()->getOperand(0));
2433 case ISD::ANY_EXTEND:
2434 assert(VT.isInteger() && Operand.getValueType().isInteger() &&
2435 "Invalid ANY_EXTEND!");
2436 if (Operand.getValueType() == VT) return Operand; // noop extension
2437 assert(Operand.getValueType().getScalarType().bitsLT(VT.getScalarType()) &&
2438 "Invalid anyext node, dst < src!");
2439 assert((!VT.isVector() ||
2440 VT.getVectorNumElements() ==
2441 Operand.getValueType().getVectorNumElements()) &&
2442 "Vector element count mismatch!");
2444 if (OpOpcode == ISD::ZERO_EXTEND || OpOpcode == ISD::SIGN_EXTEND ||
2445 OpOpcode == ISD::ANY_EXTEND)
2446 // (ext (zext x)) -> (zext x) and (ext (sext x)) -> (sext x)
2447 return getNode(OpOpcode, DL, VT, Operand.getNode()->getOperand(0));
2449 // (ext (trunx x)) -> x
2450 if (OpOpcode == ISD::TRUNCATE) {
2451 SDValue OpOp = Operand.getNode()->getOperand(0);
2452 if (OpOp.getValueType() == VT)
2457 assert(VT.isInteger() && Operand.getValueType().isInteger() &&
2458 "Invalid TRUNCATE!");
2459 if (Operand.getValueType() == VT) return Operand; // noop truncate
2460 assert(Operand.getValueType().getScalarType().bitsGT(VT.getScalarType()) &&
2461 "Invalid truncate node, src < dst!");
2462 assert((!VT.isVector() ||
2463 VT.getVectorNumElements() ==
2464 Operand.getValueType().getVectorNumElements()) &&
2465 "Vector element count mismatch!");
2466 if (OpOpcode == ISD::TRUNCATE)
2467 return getNode(ISD::TRUNCATE, DL, VT, Operand.getNode()->getOperand(0));
2468 else if (OpOpcode == ISD::ZERO_EXTEND || OpOpcode == ISD::SIGN_EXTEND ||
2469 OpOpcode == ISD::ANY_EXTEND) {
2470 // If the source is smaller than the dest, we still need an extend.
2471 if (Operand.getNode()->getOperand(0).getValueType().getScalarType()
2472 .bitsLT(VT.getScalarType()))
2473 return getNode(OpOpcode, DL, VT, Operand.getNode()->getOperand(0));
2474 else if (Operand.getNode()->getOperand(0).getValueType().bitsGT(VT))
2475 return getNode(ISD::TRUNCATE, DL, VT, Operand.getNode()->getOperand(0));
2477 return Operand.getNode()->getOperand(0);
2480 case ISD::BIT_CONVERT:
2481 // Basic sanity checking.
2482 assert(VT.getSizeInBits() == Operand.getValueType().getSizeInBits()
2483 && "Cannot BIT_CONVERT between types of different sizes!");
2484 if (VT == Operand.getValueType()) return Operand; // noop conversion.
2485 if (OpOpcode == ISD::BIT_CONVERT) // bitconv(bitconv(x)) -> bitconv(x)
2486 return getNode(ISD::BIT_CONVERT, DL, VT, Operand.getOperand(0));
2487 if (OpOpcode == ISD::UNDEF)
2488 return getUNDEF(VT);
2490 case ISD::SCALAR_TO_VECTOR:
2491 assert(VT.isVector() && !Operand.getValueType().isVector() &&
2492 (VT.getVectorElementType() == Operand.getValueType() ||
2493 (VT.getVectorElementType().isInteger() &&
2494 Operand.getValueType().isInteger() &&
2495 VT.getVectorElementType().bitsLE(Operand.getValueType()))) &&
2496 "Illegal SCALAR_TO_VECTOR node!");
2497 if (OpOpcode == ISD::UNDEF)
2498 return getUNDEF(VT);
2499 // scalar_to_vector(extract_vector_elt V, 0) -> V, top bits are undefined.
2500 if (OpOpcode == ISD::EXTRACT_VECTOR_ELT &&
2501 isa<ConstantSDNode>(Operand.getOperand(1)) &&
2502 Operand.getConstantOperandVal(1) == 0 &&
2503 Operand.getOperand(0).getValueType() == VT)
2504 return Operand.getOperand(0);
2507 // -(X-Y) -> (Y-X) is unsafe because when X==Y, -0.0 != +0.0
2508 if (UnsafeFPMath && OpOpcode == ISD::FSUB)
2509 return getNode(ISD::FSUB, DL, VT, Operand.getNode()->getOperand(1),
2510 Operand.getNode()->getOperand(0));
2511 if (OpOpcode == ISD::FNEG) // --X -> X
2512 return Operand.getNode()->getOperand(0);
2515 if (OpOpcode == ISD::FNEG) // abs(-X) -> abs(X)
2516 return getNode(ISD::FABS, DL, VT, Operand.getNode()->getOperand(0));
2521 SDVTList VTs = getVTList(VT);
2522 if (VT != MVT::Flag) { // Don't CSE flag producing nodes
2523 FoldingSetNodeID ID;
2524 SDValue Ops[1] = { Operand };
2525 AddNodeIDNode(ID, Opcode, VTs, Ops, 1);
2527 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
2528 return SDValue(E, 0);
2530 N = new (NodeAllocator) UnarySDNode(Opcode, DL, VTs, Operand);
2531 CSEMap.InsertNode(N, IP);
2533 N = new (NodeAllocator) UnarySDNode(Opcode, DL, VTs, Operand);
2536 AllNodes.push_back(N);
2540 return SDValue(N, 0);
2543 SDValue SelectionDAG::FoldConstantArithmetic(unsigned Opcode,
2545 ConstantSDNode *Cst1,
2546 ConstantSDNode *Cst2) {
2547 const APInt &C1 = Cst1->getAPIntValue(), &C2 = Cst2->getAPIntValue();
2550 case ISD::ADD: return getConstant(C1 + C2, VT);
2551 case ISD::SUB: return getConstant(C1 - C2, VT);
2552 case ISD::MUL: return getConstant(C1 * C2, VT);
2554 if (C2.getBoolValue()) return getConstant(C1.udiv(C2), VT);
2557 if (C2.getBoolValue()) return getConstant(C1.urem(C2), VT);
2560 if (C2.getBoolValue()) return getConstant(C1.sdiv(C2), VT);
2563 if (C2.getBoolValue()) return getConstant(C1.srem(C2), VT);
2565 case ISD::AND: return getConstant(C1 & C2, VT);
2566 case ISD::OR: return getConstant(C1 | C2, VT);
2567 case ISD::XOR: return getConstant(C1 ^ C2, VT);
2568 case ISD::SHL: return getConstant(C1 << C2, VT);
2569 case ISD::SRL: return getConstant(C1.lshr(C2), VT);
2570 case ISD::SRA: return getConstant(C1.ashr(C2), VT);
2571 case ISD::ROTL: return getConstant(C1.rotl(C2), VT);
2572 case ISD::ROTR: return getConstant(C1.rotr(C2), VT);
2579 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT,
2580 SDValue N1, SDValue N2) {
2581 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.getNode());
2582 ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.getNode());
2585 case ISD::TokenFactor:
2586 assert(VT == MVT::Other && N1.getValueType() == MVT::Other &&
2587 N2.getValueType() == MVT::Other && "Invalid token factor!");
2588 // Fold trivial token factors.
2589 if (N1.getOpcode() == ISD::EntryToken) return N2;
2590 if (N2.getOpcode() == ISD::EntryToken) return N1;
2591 if (N1 == N2) return N1;
2593 case ISD::CONCAT_VECTORS:
2594 // A CONCAT_VECTOR with all operands BUILD_VECTOR can be simplified to
2595 // one big BUILD_VECTOR.
2596 if (N1.getOpcode() == ISD::BUILD_VECTOR &&
2597 N2.getOpcode() == ISD::BUILD_VECTOR) {
2598 SmallVector<SDValue, 16> Elts(N1.getNode()->op_begin(),
2599 N1.getNode()->op_end());
2600 Elts.append(N2.getNode()->op_begin(), N2.getNode()->op_end());
2601 return getNode(ISD::BUILD_VECTOR, DL, VT, &Elts[0], Elts.size());
2605 assert(VT.isInteger() && "This operator does not apply to FP types!");
2606 assert(N1.getValueType() == N2.getValueType() &&
2607 N1.getValueType() == VT && "Binary operator types must match!");
2608 // (X & 0) -> 0. This commonly occurs when legalizing i64 values, so it's
2609 // worth handling here.
2610 if (N2C && N2C->isNullValue())
2612 if (N2C && N2C->isAllOnesValue()) // X & -1 -> X
2619 assert(VT.isInteger() && "This operator does not apply to FP types!");
2620 assert(N1.getValueType() == N2.getValueType() &&
2621 N1.getValueType() == VT && "Binary operator types must match!");
2622 // (X ^|+- 0) -> X. This commonly occurs when legalizing i64 values, so
2623 // it's worth handling here.
2624 if (N2C && N2C->isNullValue())
2634 assert(VT.isInteger() && "This operator does not apply to FP types!");
2635 assert(N1.getValueType() == N2.getValueType() &&
2636 N1.getValueType() == VT && "Binary operator types must match!");
2644 if (Opcode == ISD::FADD) {
2646 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(N1))
2647 if (CFP->getValueAPF().isZero())
2650 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(N2))
2651 if (CFP->getValueAPF().isZero())
2653 } else if (Opcode == ISD::FSUB) {
2655 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(N2))
2656 if (CFP->getValueAPF().isZero())
2660 assert(VT.isFloatingPoint() && "This operator only applies to FP types!");
2661 assert(N1.getValueType() == N2.getValueType() &&
2662 N1.getValueType() == VT && "Binary operator types must match!");
2664 case ISD::FCOPYSIGN: // N1 and result must match. N1/N2 need not match.
2665 assert(N1.getValueType() == VT &&
2666 N1.getValueType().isFloatingPoint() &&
2667 N2.getValueType().isFloatingPoint() &&
2668 "Invalid FCOPYSIGN!");
2675 assert(VT == N1.getValueType() &&
2676 "Shift operators return type must be the same as their first arg");
2677 assert(VT.isInteger() && N2.getValueType().isInteger() &&
2678 "Shifts only work on integers");
2680 // Always fold shifts of i1 values so the code generator doesn't need to
2681 // handle them. Since we know the size of the shift has to be less than the
2682 // size of the value, the shift/rotate count is guaranteed to be zero.
2685 if (N2C && N2C->isNullValue())
2688 case ISD::FP_ROUND_INREG: {
2689 EVT EVT = cast<VTSDNode>(N2)->getVT();
2690 assert(VT == N1.getValueType() && "Not an inreg round!");
2691 assert(VT.isFloatingPoint() && EVT.isFloatingPoint() &&
2692 "Cannot FP_ROUND_INREG integer types");
2693 assert(EVT.isVector() == VT.isVector() &&
2694 "FP_ROUND_INREG type should be vector iff the operand "
2696 assert((!EVT.isVector() ||
2697 EVT.getVectorNumElements() == VT.getVectorNumElements()) &&
2698 "Vector element counts must match in FP_ROUND_INREG");
2699 assert(EVT.bitsLE(VT) && "Not rounding down!");
2700 if (cast<VTSDNode>(N2)->getVT() == VT) return N1; // Not actually rounding.
2704 assert(VT.isFloatingPoint() &&
2705 N1.getValueType().isFloatingPoint() &&
2706 VT.bitsLE(N1.getValueType()) &&
2707 isa<ConstantSDNode>(N2) && "Invalid FP_ROUND!");
2708 if (N1.getValueType() == VT) return N1; // noop conversion.
2710 case ISD::AssertSext:
2711 case ISD::AssertZext: {
2712 EVT EVT = cast<VTSDNode>(N2)->getVT();
2713 assert(VT == N1.getValueType() && "Not an inreg extend!");
2714 assert(VT.isInteger() && EVT.isInteger() &&
2715 "Cannot *_EXTEND_INREG FP types");
2716 assert(!EVT.isVector() &&
2717 "AssertSExt/AssertZExt type should be the vector element type "
2718 "rather than the vector type!");
2719 assert(EVT.bitsLE(VT) && "Not extending!");
2720 if (VT == EVT) return N1; // noop assertion.
2723 case ISD::SIGN_EXTEND_INREG: {
2724 EVT EVT = cast<VTSDNode>(N2)->getVT();
2725 assert(VT == N1.getValueType() && "Not an inreg extend!");
2726 assert(VT.isInteger() && EVT.isInteger() &&
2727 "Cannot *_EXTEND_INREG FP types");
2728 assert(EVT.isVector() == VT.isVector() &&
2729 "SIGN_EXTEND_INREG type should be vector iff the operand "
2731 assert((!EVT.isVector() ||
2732 EVT.getVectorNumElements() == VT.getVectorNumElements()) &&
2733 "Vector element counts must match in SIGN_EXTEND_INREG");
2734 assert(EVT.bitsLE(VT) && "Not extending!");
2735 if (EVT == VT) return N1; // Not actually extending
2738 APInt Val = N1C->getAPIntValue();
2739 unsigned FromBits = EVT.getScalarType().getSizeInBits();
2740 Val <<= Val.getBitWidth()-FromBits;
2741 Val = Val.ashr(Val.getBitWidth()-FromBits);
2742 return getConstant(Val, VT);
2746 case ISD::EXTRACT_VECTOR_ELT:
2747 // EXTRACT_VECTOR_ELT of an UNDEF is an UNDEF.
2748 if (N1.getOpcode() == ISD::UNDEF)
2749 return getUNDEF(VT);
2751 // EXTRACT_VECTOR_ELT of CONCAT_VECTORS is often formed while lowering is
2752 // expanding copies of large vectors from registers.
2754 N1.getOpcode() == ISD::CONCAT_VECTORS &&
2755 N1.getNumOperands() > 0) {
2757 N1.getOperand(0).getValueType().getVectorNumElements();
2758 return getNode(ISD::EXTRACT_VECTOR_ELT, DL, VT,
2759 N1.getOperand(N2C->getZExtValue() / Factor),
2760 getConstant(N2C->getZExtValue() % Factor,
2761 N2.getValueType()));
2764 // EXTRACT_VECTOR_ELT of BUILD_VECTOR is often formed while lowering is
2765 // expanding large vector constants.
2766 if (N2C && N1.getOpcode() == ISD::BUILD_VECTOR) {
2767 SDValue Elt = N1.getOperand(N2C->getZExtValue());
2768 EVT VEltTy = N1.getValueType().getVectorElementType();
2769 if (Elt.getValueType() != VEltTy) {
2770 // If the vector element type is not legal, the BUILD_VECTOR operands
2771 // are promoted and implicitly truncated. Make that explicit here.
2772 Elt = getNode(ISD::TRUNCATE, DL, VEltTy, Elt);
2775 // If the vector element type is not legal, the EXTRACT_VECTOR_ELT
2776 // result is implicitly extended.
2777 Elt = getNode(ISD::ANY_EXTEND, DL, VT, Elt);
2782 // EXTRACT_VECTOR_ELT of INSERT_VECTOR_ELT is often formed when vector
2783 // operations are lowered to scalars.
2784 if (N1.getOpcode() == ISD::INSERT_VECTOR_ELT) {
2785 // If the indices are the same, return the inserted element else
2786 // if the indices are known different, extract the element from
2787 // the original vector.
2788 SDValue N1Op2 = N1.getOperand(2);
2789 ConstantSDNode *N1Op2C = dyn_cast<ConstantSDNode>(N1Op2.getNode());
2791 if (N1Op2C && N2C) {
2792 if (N1Op2C->getZExtValue() == N2C->getZExtValue()) {
2793 if (VT == N1.getOperand(1).getValueType())
2794 return N1.getOperand(1);
2796 return getSExtOrTrunc(N1.getOperand(1), DL, VT);
2799 return getNode(ISD::EXTRACT_VECTOR_ELT, DL, VT, N1.getOperand(0), N2);
2803 case ISD::EXTRACT_ELEMENT:
2804 assert(N2C && (unsigned)N2C->getZExtValue() < 2 && "Bad EXTRACT_ELEMENT!");
2805 assert(!N1.getValueType().isVector() && !VT.isVector() &&
2806 (N1.getValueType().isInteger() == VT.isInteger()) &&
2807 "Wrong types for EXTRACT_ELEMENT!");
2809 // EXTRACT_ELEMENT of BUILD_PAIR is often formed while legalize is expanding
2810 // 64-bit integers into 32-bit parts. Instead of building the extract of
2811 // the BUILD_PAIR, only to have legalize rip it apart, just do it now.
2812 if (N1.getOpcode() == ISD::BUILD_PAIR)
2813 return N1.getOperand(N2C->getZExtValue());
2815 // EXTRACT_ELEMENT of a constant int is also very common.
2816 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N1)) {
2817 unsigned ElementSize = VT.getSizeInBits();
2818 unsigned Shift = ElementSize * N2C->getZExtValue();
2819 APInt ShiftedVal = C->getAPIntValue().lshr(Shift);
2820 return getConstant(ShiftedVal.trunc(ElementSize), VT);
2823 case ISD::EXTRACT_SUBVECTOR:
2824 if (N1.getValueType() == VT) // Trivial extraction.
2831 SDValue SV = FoldConstantArithmetic(Opcode, VT, N1C, N2C);
2832 if (SV.getNode()) return SV;
2833 } else { // Cannonicalize constant to RHS if commutative
2834 if (isCommutativeBinOp(Opcode)) {
2835 std::swap(N1C, N2C);
2841 // Constant fold FP operations.
2842 ConstantFPSDNode *N1CFP = dyn_cast<ConstantFPSDNode>(N1.getNode());
2843 ConstantFPSDNode *N2CFP = dyn_cast<ConstantFPSDNode>(N2.getNode());
2845 if (!N2CFP && isCommutativeBinOp(Opcode)) {
2846 // Cannonicalize constant to RHS if commutative
2847 std::swap(N1CFP, N2CFP);
2849 } else if (N2CFP && VT != MVT::ppcf128) {
2850 APFloat V1 = N1CFP->getValueAPF(), V2 = N2CFP->getValueAPF();
2851 APFloat::opStatus s;
2854 s = V1.add(V2, APFloat::rmNearestTiesToEven);
2855 if (s != APFloat::opInvalidOp)
2856 return getConstantFP(V1, VT);
2859 s = V1.subtract(V2, APFloat::rmNearestTiesToEven);
2860 if (s!=APFloat::opInvalidOp)
2861 return getConstantFP(V1, VT);
2864 s = V1.multiply(V2, APFloat::rmNearestTiesToEven);
2865 if (s!=APFloat::opInvalidOp)
2866 return getConstantFP(V1, VT);
2869 s = V1.divide(V2, APFloat::rmNearestTiesToEven);
2870 if (s!=APFloat::opInvalidOp && s!=APFloat::opDivByZero)
2871 return getConstantFP(V1, VT);
2874 s = V1.mod(V2, APFloat::rmNearestTiesToEven);
2875 if (s!=APFloat::opInvalidOp && s!=APFloat::opDivByZero)
2876 return getConstantFP(V1, VT);
2878 case ISD::FCOPYSIGN:
2880 return getConstantFP(V1, VT);
2886 // Canonicalize an UNDEF to the RHS, even over a constant.
2887 if (N1.getOpcode() == ISD::UNDEF) {
2888 if (isCommutativeBinOp(Opcode)) {
2892 case ISD::FP_ROUND_INREG:
2893 case ISD::SIGN_EXTEND_INREG:
2899 return N1; // fold op(undef, arg2) -> undef
2907 return getConstant(0, VT); // fold op(undef, arg2) -> 0
2908 // For vectors, we can't easily build an all zero vector, just return
2915 // Fold a bunch of operators when the RHS is undef.
2916 if (N2.getOpcode() == ISD::UNDEF) {
2919 if (N1.getOpcode() == ISD::UNDEF)
2920 // Handle undef ^ undef -> 0 special case. This is a common
2922 return getConstant(0, VT);
2932 return N2; // fold op(arg1, undef) -> undef
2946 return getConstant(0, VT); // fold op(arg1, undef) -> 0
2947 // For vectors, we can't easily build an all zero vector, just return
2952 return getConstant(APInt::getAllOnesValue(VT.getSizeInBits()), VT);
2953 // For vectors, we can't easily build an all one vector, just return
2961 // Memoize this node if possible.
2963 SDVTList VTs = getVTList(VT);
2964 if (VT != MVT::Flag) {
2965 SDValue Ops[] = { N1, N2 };
2966 FoldingSetNodeID ID;
2967 AddNodeIDNode(ID, Opcode, VTs, Ops, 2);
2969 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
2970 return SDValue(E, 0);
2972 N = new (NodeAllocator) BinarySDNode(Opcode, DL, VTs, N1, N2);
2973 CSEMap.InsertNode(N, IP);
2975 N = new (NodeAllocator) BinarySDNode(Opcode, DL, VTs, N1, N2);
2978 AllNodes.push_back(N);
2982 return SDValue(N, 0);
2985 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT,
2986 SDValue N1, SDValue N2, SDValue N3) {
2987 // Perform various simplifications.
2988 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.getNode());
2990 case ISD::CONCAT_VECTORS:
2991 // A CONCAT_VECTOR with all operands BUILD_VECTOR can be simplified to
2992 // one big BUILD_VECTOR.
2993 if (N1.getOpcode() == ISD::BUILD_VECTOR &&
2994 N2.getOpcode() == ISD::BUILD_VECTOR &&
2995 N3.getOpcode() == ISD::BUILD_VECTOR) {
2996 SmallVector<SDValue, 16> Elts(N1.getNode()->op_begin(),
2997 N1.getNode()->op_end());
2998 Elts.append(N2.getNode()->op_begin(), N2.getNode()->op_end());
2999 Elts.append(N3.getNode()->op_begin(), N3.getNode()->op_end());
3000 return getNode(ISD::BUILD_VECTOR, DL, VT, &Elts[0], Elts.size());
3004 // Use FoldSetCC to simplify SETCC's.
3005 SDValue Simp = FoldSetCC(VT, N1, N2, cast<CondCodeSDNode>(N3)->get(), DL);
3006 if (Simp.getNode()) return Simp;
3011 if (N1C->getZExtValue())
3012 return N2; // select true, X, Y -> X
3014 return N3; // select false, X, Y -> Y
3017 if (N2 == N3) return N2; // select C, X, X -> X
3019 case ISD::VECTOR_SHUFFLE:
3020 llvm_unreachable("should use getVectorShuffle constructor!");
3022 case ISD::BIT_CONVERT:
3023 // Fold bit_convert nodes from a type to themselves.
3024 if (N1.getValueType() == VT)
3029 // Memoize node if it doesn't produce a flag.
3031 SDVTList VTs = getVTList(VT);
3032 if (VT != MVT::Flag) {
3033 SDValue Ops[] = { N1, N2, N3 };
3034 FoldingSetNodeID ID;
3035 AddNodeIDNode(ID, Opcode, VTs, Ops, 3);
3037 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
3038 return SDValue(E, 0);
3040 N = new (NodeAllocator) TernarySDNode(Opcode, DL, VTs, N1, N2, N3);
3041 CSEMap.InsertNode(N, IP);
3043 N = new (NodeAllocator) TernarySDNode(Opcode, DL, VTs, N1, N2, N3);
3046 AllNodes.push_back(N);
3050 return SDValue(N, 0);
3053 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT,
3054 SDValue N1, SDValue N2, SDValue N3,
3056 SDValue Ops[] = { N1, N2, N3, N4 };
3057 return getNode(Opcode, DL, VT, Ops, 4);
3060 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT,
3061 SDValue N1, SDValue N2, SDValue N3,
3062 SDValue N4, SDValue N5) {
3063 SDValue Ops[] = { N1, N2, N3, N4, N5 };
3064 return getNode(Opcode, DL, VT, Ops, 5);
3067 /// getStackArgumentTokenFactor - Compute a TokenFactor to force all
3068 /// the incoming stack arguments to be loaded from the stack.
3069 SDValue SelectionDAG::getStackArgumentTokenFactor(SDValue Chain) {
3070 SmallVector<SDValue, 8> ArgChains;
3072 // Include the original chain at the beginning of the list. When this is
3073 // used by target LowerCall hooks, this helps legalize find the
3074 // CALLSEQ_BEGIN node.
3075 ArgChains.push_back(Chain);
3077 // Add a chain value for each stack argument.
3078 for (SDNode::use_iterator U = getEntryNode().getNode()->use_begin(),
3079 UE = getEntryNode().getNode()->use_end(); U != UE; ++U)
3080 if (LoadSDNode *L = dyn_cast<LoadSDNode>(*U))
3081 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(L->getBasePtr()))
3082 if (FI->getIndex() < 0)
3083 ArgChains.push_back(SDValue(L, 1));
3085 // Build a tokenfactor for all the chains.
3086 return getNode(ISD::TokenFactor, Chain.getDebugLoc(), MVT::Other,
3087 &ArgChains[0], ArgChains.size());
3090 /// getMemsetValue - Vectorized representation of the memset value
3092 static SDValue getMemsetValue(SDValue Value, EVT VT, SelectionDAG &DAG,
3094 assert(Value.getOpcode() != ISD::UNDEF);
3096 unsigned NumBits = VT.getScalarType().getSizeInBits();
3097 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Value)) {
3098 APInt Val = APInt(NumBits, C->getZExtValue() & 255);
3100 for (unsigned i = NumBits; i > 8; i >>= 1) {
3101 Val = (Val << Shift) | Val;
3105 return DAG.getConstant(Val, VT);
3106 return DAG.getConstantFP(APFloat(Val), VT);
3109 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
3110 Value = DAG.getNode(ISD::ZERO_EXTEND, dl, VT, Value);
3112 for (unsigned i = NumBits; i > 8; i >>= 1) {
3113 Value = DAG.getNode(ISD::OR, dl, VT,
3114 DAG.getNode(ISD::SHL, dl, VT, Value,
3115 DAG.getConstant(Shift,
3116 TLI.getShiftAmountTy())),
3124 /// getMemsetStringVal - Similar to getMemsetValue. Except this is only
3125 /// used when a memcpy is turned into a memset when the source is a constant
3127 static SDValue getMemsetStringVal(EVT VT, DebugLoc dl, SelectionDAG &DAG,
3128 const TargetLowering &TLI,
3129 std::string &Str, unsigned Offset) {
3130 // Handle vector with all elements zero.
3133 return DAG.getConstant(0, VT);
3134 else if (VT.getSimpleVT().SimpleTy == MVT::f32 ||
3135 VT.getSimpleVT().SimpleTy == MVT::f64)
3136 return DAG.getConstantFP(0.0, VT);
3137 else if (VT.isVector()) {
3138 unsigned NumElts = VT.getVectorNumElements();
3139 MVT EltVT = (VT.getVectorElementType() == MVT::f32) ? MVT::i32 : MVT::i64;
3140 return DAG.getNode(ISD::BIT_CONVERT, dl, VT,
3141 DAG.getConstant(0, EVT::getVectorVT(*DAG.getContext(),
3144 llvm_unreachable("Expected type!");
3147 assert(!VT.isVector() && "Can't handle vector type here!");
3148 unsigned NumBits = VT.getSizeInBits();
3149 unsigned MSB = NumBits / 8;
3151 if (TLI.isLittleEndian())
3152 Offset = Offset + MSB - 1;
3153 for (unsigned i = 0; i != MSB; ++i) {
3154 Val = (Val << 8) | (unsigned char)Str[Offset];
3155 Offset += TLI.isLittleEndian() ? -1 : 1;
3157 return DAG.getConstant(Val, VT);
3160 /// getMemBasePlusOffset - Returns base and offset node for the
3162 static SDValue getMemBasePlusOffset(SDValue Base, unsigned Offset,
3163 SelectionDAG &DAG) {
3164 EVT VT = Base.getValueType();
3165 return DAG.getNode(ISD::ADD, Base.getDebugLoc(),
3166 VT, Base, DAG.getConstant(Offset, VT));
3169 /// isMemSrcFromString - Returns true if memcpy source is a string constant.
3171 static bool isMemSrcFromString(SDValue Src, std::string &Str) {
3172 unsigned SrcDelta = 0;
3173 GlobalAddressSDNode *G = NULL;
3174 if (Src.getOpcode() == ISD::GlobalAddress)
3175 G = cast<GlobalAddressSDNode>(Src);
3176 else if (Src.getOpcode() == ISD::ADD &&
3177 Src.getOperand(0).getOpcode() == ISD::GlobalAddress &&
3178 Src.getOperand(1).getOpcode() == ISD::Constant) {
3179 G = cast<GlobalAddressSDNode>(Src.getOperand(0));
3180 SrcDelta = cast<ConstantSDNode>(Src.getOperand(1))->getZExtValue();
3185 const GlobalVariable *GV = dyn_cast<GlobalVariable>(G->getGlobal());
3186 if (GV && GetConstantStringInfo(GV, Str, SrcDelta, false))
3192 /// FindOptimalMemOpLowering - Determines the optimial series memory ops
3193 /// to replace the memset / memcpy. Return true if the number of memory ops
3194 /// is below the threshold. It returns the types of the sequence of
3195 /// memory ops to perform memset / memcpy by reference.
3196 static bool FindOptimalMemOpLowering(std::vector<EVT> &MemOps,
3197 unsigned Limit, uint64_t Size,
3198 unsigned DstAlign, unsigned SrcAlign,
3199 bool NonScalarIntSafe,
3202 const TargetLowering &TLI) {
3203 assert((SrcAlign == 0 || SrcAlign >= DstAlign) &&
3204 "Expecting memcpy / memset source to meet alignment requirement!");
3205 // If 'SrcAlign' is zero, that means the memory operation does not need load
3206 // the value, i.e. memset or memcpy from constant string. Otherwise, it's
3207 // the inferred alignment of the source. 'DstAlign', on the other hand, is the
3208 // specified alignment of the memory operation. If it is zero, that means
3209 // it's possible to change the alignment of the destination. 'MemcpyStrSrc'
3210 // indicates whether the memcpy source is constant so it does not need to be
3212 EVT VT = TLI.getOptimalMemOpType(Size, DstAlign, SrcAlign,
3213 NonScalarIntSafe, MemcpyStrSrc,
3214 DAG.getMachineFunction());
3216 if (VT == MVT::Other) {
3217 if (DstAlign >= TLI.getTargetData()->getPointerPrefAlignment() ||
3218 TLI.allowsUnalignedMemoryAccesses(VT)) {
3219 VT = TLI.getPointerTy();
3221 switch (DstAlign & 7) {
3222 case 0: VT = MVT::i64; break;
3223 case 4: VT = MVT::i32; break;
3224 case 2: VT = MVT::i16; break;
3225 default: VT = MVT::i8; break;
3230 while (!TLI.isTypeLegal(LVT))
3231 LVT = (MVT::SimpleValueType)(LVT.SimpleTy - 1);
3232 assert(LVT.isInteger());
3238 // If we're optimizing for size, and there is a limit, bump the maximum number
3239 // of operations inserted down to 4. This is a wild guess that approximates
3240 // the size of a call to memcpy or memset (3 arguments + call).
3242 const Function *F = DAG.getMachineFunction().getFunction();
3243 if (F->hasFnAttr(Attribute::OptimizeForSize))
3247 unsigned NumMemOps = 0;
3249 unsigned VTSize = VT.getSizeInBits() / 8;
3250 while (VTSize > Size) {
3251 // For now, only use non-vector load / store's for the left-over pieces.
3252 if (VT.isVector() || VT.isFloatingPoint()) {
3254 while (!TLI.isTypeLegal(VT))
3255 VT = (MVT::SimpleValueType)(VT.getSimpleVT().SimpleTy - 1);
3256 VTSize = VT.getSizeInBits() / 8;
3258 // This can result in a type that is not legal on the target, e.g.
3259 // 1 or 2 bytes on PPC.
3260 VT = (MVT::SimpleValueType)(VT.getSimpleVT().SimpleTy - 1);
3265 if (++NumMemOps > Limit)
3267 MemOps.push_back(VT);
3274 static SDValue getMemcpyLoadsAndStores(SelectionDAG &DAG, DebugLoc dl,
3275 SDValue Chain, SDValue Dst,
3276 SDValue Src, uint64_t Size,
3277 unsigned Align, bool isVol,
3279 const Value *DstSV, uint64_t DstSVOff,
3280 const Value *SrcSV, uint64_t SrcSVOff) {
3281 // Turn a memcpy of undef to nop.
3282 if (Src.getOpcode() == ISD::UNDEF)
3285 // Expand memcpy to a series of load and store ops if the size operand falls
3286 // below a certain threshold.
3287 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
3288 std::vector<EVT> MemOps;
3289 bool DstAlignCanChange = false;
3290 MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
3291 FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Dst);
3292 if (FI && !MFI->isFixedObjectIndex(FI->getIndex()))
3293 DstAlignCanChange = true;
3294 unsigned SrcAlign = DAG.InferPtrAlignment(Src);
3295 if (Align > SrcAlign)
3298 bool CopyFromStr = isMemSrcFromString(Src, Str);
3299 bool isZeroStr = CopyFromStr && Str.empty();
3300 unsigned Limit = AlwaysInline ? ~0U : TLI.getMaxStoresPerMemcpy();
3302 if (!FindOptimalMemOpLowering(MemOps, Limit, Size,
3303 (DstAlignCanChange ? 0 : Align),
3304 (isZeroStr ? 0 : SrcAlign),
3305 true, CopyFromStr, DAG, TLI))
3308 if (DstAlignCanChange) {
3309 const Type *Ty = MemOps[0].getTypeForEVT(*DAG.getContext());
3310 unsigned NewAlign = (unsigned) TLI.getTargetData()->getABITypeAlignment(Ty);
3311 if (NewAlign > Align) {
3312 // Give the stack frame object a larger alignment if needed.
3313 if (MFI->getObjectAlignment(FI->getIndex()) < NewAlign)
3314 MFI->setObjectAlignment(FI->getIndex(), NewAlign);
3319 SmallVector<SDValue, 8> OutChains;
3320 unsigned NumMemOps = MemOps.size();
3321 uint64_t SrcOff = 0, DstOff = 0;
3322 for (unsigned i = 0; i != NumMemOps; ++i) {
3324 unsigned VTSize = VT.getSizeInBits() / 8;
3325 SDValue Value, Store;
3328 (isZeroStr || (VT.isInteger() && !VT.isVector()))) {
3329 // It's unlikely a store of a vector immediate can be done in a single
3330 // instruction. It would require a load from a constantpool first.
3331 // We only handle zero vectors here.
3332 // FIXME: Handle other cases where store of vector immediate is done in
3333 // a single instruction.
3334 Value = getMemsetStringVal(VT, dl, DAG, TLI, Str, SrcOff);
3335 Store = DAG.getStore(Chain, dl, Value,
3336 getMemBasePlusOffset(Dst, DstOff, DAG),
3337 DstSV, DstSVOff + DstOff, isVol, false, Align);
3339 // The type might not be legal for the target. This should only happen
3340 // if the type is smaller than a legal type, as on PPC, so the right
3341 // thing to do is generate a LoadExt/StoreTrunc pair. These simplify
3342 // to Load/Store if NVT==VT.
3343 // FIXME does the case above also need this?
3344 EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), VT);
3345 assert(NVT.bitsGE(VT));
3346 Value = DAG.getExtLoad(ISD::EXTLOAD, NVT, dl, Chain,
3347 getMemBasePlusOffset(Src, SrcOff, DAG),
3348 SrcSV, SrcSVOff + SrcOff, VT, isVol, false,
3349 MinAlign(SrcAlign, SrcOff));
3350 Store = DAG.getTruncStore(Chain, dl, Value,
3351 getMemBasePlusOffset(Dst, DstOff, DAG),
3352 DstSV, DstSVOff + DstOff, VT, isVol, false,
3355 OutChains.push_back(Store);
3360 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
3361 &OutChains[0], OutChains.size());
3364 static SDValue getMemmoveLoadsAndStores(SelectionDAG &DAG, DebugLoc dl,
3365 SDValue Chain, SDValue Dst,
3366 SDValue Src, uint64_t Size,
3367 unsigned Align, bool isVol,
3369 const Value *DstSV, uint64_t DstSVOff,
3370 const Value *SrcSV, uint64_t SrcSVOff) {
3371 // Turn a memmove of undef to nop.
3372 if (Src.getOpcode() == ISD::UNDEF)
3375 // Expand memmove to a series of load and store ops if the size operand falls
3376 // below a certain threshold.
3377 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
3378 std::vector<EVT> MemOps;
3379 bool DstAlignCanChange = false;
3380 MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
3381 FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Dst);
3382 if (FI && !MFI->isFixedObjectIndex(FI->getIndex()))
3383 DstAlignCanChange = true;
3384 unsigned SrcAlign = DAG.InferPtrAlignment(Src);
3385 if (Align > SrcAlign)
3387 unsigned Limit = AlwaysInline ? ~0U : TLI.getMaxStoresPerMemmove();
3389 if (!FindOptimalMemOpLowering(MemOps, Limit, Size,
3390 (DstAlignCanChange ? 0 : Align),
3391 SrcAlign, true, false, DAG, TLI))
3394 if (DstAlignCanChange) {
3395 const Type *Ty = MemOps[0].getTypeForEVT(*DAG.getContext());
3396 unsigned NewAlign = (unsigned) TLI.getTargetData()->getABITypeAlignment(Ty);
3397 if (NewAlign > Align) {
3398 // Give the stack frame object a larger alignment if needed.
3399 if (MFI->getObjectAlignment(FI->getIndex()) < NewAlign)
3400 MFI->setObjectAlignment(FI->getIndex(), NewAlign);
3405 uint64_t SrcOff = 0, DstOff = 0;
3406 SmallVector<SDValue, 8> LoadValues;
3407 SmallVector<SDValue, 8> LoadChains;
3408 SmallVector<SDValue, 8> OutChains;
3409 unsigned NumMemOps = MemOps.size();
3410 for (unsigned i = 0; i < NumMemOps; i++) {
3412 unsigned VTSize = VT.getSizeInBits() / 8;
3413 SDValue Value, Store;
3415 Value = DAG.getLoad(VT, dl, Chain,
3416 getMemBasePlusOffset(Src, SrcOff, DAG),
3417 SrcSV, SrcSVOff + SrcOff, isVol, false, SrcAlign);
3418 LoadValues.push_back(Value);
3419 LoadChains.push_back(Value.getValue(1));
3422 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
3423 &LoadChains[0], LoadChains.size());
3425 for (unsigned i = 0; i < NumMemOps; i++) {
3427 unsigned VTSize = VT.getSizeInBits() / 8;
3428 SDValue Value, Store;
3430 Store = DAG.getStore(Chain, dl, LoadValues[i],
3431 getMemBasePlusOffset(Dst, DstOff, DAG),
3432 DstSV, DstSVOff + DstOff, isVol, false, Align);
3433 OutChains.push_back(Store);
3437 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
3438 &OutChains[0], OutChains.size());
3441 static SDValue getMemsetStores(SelectionDAG &DAG, DebugLoc dl,
3442 SDValue Chain, SDValue Dst,
3443 SDValue Src, uint64_t Size,
3444 unsigned Align, bool isVol,
3445 const Value *DstSV, uint64_t DstSVOff) {
3446 // Turn a memset of undef to nop.
3447 if (Src.getOpcode() == ISD::UNDEF)
3450 // Expand memset to a series of load/store ops if the size operand
3451 // falls below a certain threshold.
3452 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
3453 std::vector<EVT> MemOps;
3454 bool DstAlignCanChange = false;
3455 MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
3456 FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Dst);
3457 if (FI && !MFI->isFixedObjectIndex(FI->getIndex()))
3458 DstAlignCanChange = true;
3459 bool NonScalarIntSafe =
3460 isa<ConstantSDNode>(Src) && cast<ConstantSDNode>(Src)->isNullValue();
3461 if (!FindOptimalMemOpLowering(MemOps, TLI.getMaxStoresPerMemset(),
3462 Size, (DstAlignCanChange ? 0 : Align), 0,
3463 NonScalarIntSafe, false, DAG, TLI))
3466 if (DstAlignCanChange) {
3467 const Type *Ty = MemOps[0].getTypeForEVT(*DAG.getContext());
3468 unsigned NewAlign = (unsigned) TLI.getTargetData()->getABITypeAlignment(Ty);
3469 if (NewAlign > Align) {
3470 // Give the stack frame object a larger alignment if needed.
3471 if (MFI->getObjectAlignment(FI->getIndex()) < NewAlign)
3472 MFI->setObjectAlignment(FI->getIndex(), NewAlign);
3477 SmallVector<SDValue, 8> OutChains;
3478 uint64_t DstOff = 0;
3479 unsigned NumMemOps = MemOps.size();
3480 for (unsigned i = 0; i < NumMemOps; i++) {
3482 unsigned VTSize = VT.getSizeInBits() / 8;
3483 SDValue Value = getMemsetValue(Src, VT, DAG, dl);
3484 SDValue Store = DAG.getStore(Chain, dl, Value,
3485 getMemBasePlusOffset(Dst, DstOff, DAG),
3486 DstSV, DstSVOff + DstOff, isVol, false, 0);
3487 OutChains.push_back(Store);
3491 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
3492 &OutChains[0], OutChains.size());
3495 SDValue SelectionDAG::getMemcpy(SDValue Chain, DebugLoc dl, SDValue Dst,
3496 SDValue Src, SDValue Size,
3497 unsigned Align, bool isVol, bool AlwaysInline,
3498 const Value *DstSV, uint64_t DstSVOff,
3499 const Value *SrcSV, uint64_t SrcSVOff) {
3501 // Check to see if we should lower the memcpy to loads and stores first.
3502 // For cases within the target-specified limits, this is the best choice.
3503 ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size);
3505 // Memcpy with size zero? Just return the original chain.
3506 if (ConstantSize->isNullValue())
3509 SDValue Result = getMemcpyLoadsAndStores(*this, dl, Chain, Dst, Src,
3510 ConstantSize->getZExtValue(),Align,
3511 isVol, false, DstSV, DstSVOff, SrcSV, SrcSVOff);
3512 if (Result.getNode())
3516 // Then check to see if we should lower the memcpy with target-specific
3517 // code. If the target chooses to do this, this is the next best.
3519 TSI.EmitTargetCodeForMemcpy(*this, dl, Chain, Dst, Src, Size, Align,
3520 isVol, AlwaysInline,
3521 DstSV, DstSVOff, SrcSV, SrcSVOff);
3522 if (Result.getNode())
3525 // If we really need inline code and the target declined to provide it,
3526 // use a (potentially long) sequence of loads and stores.
3528 assert(ConstantSize && "AlwaysInline requires a constant size!");
3529 return getMemcpyLoadsAndStores(*this, dl, Chain, Dst, Src,
3530 ConstantSize->getZExtValue(), Align, isVol,
3531 true, DstSV, DstSVOff, SrcSV, SrcSVOff);
3534 // FIXME: If the memcpy is volatile (isVol), lowering it to a plain libc
3535 // memcpy is not guaranteed to be safe. libc memcpys aren't required to
3536 // respect volatile, so they may do things like read or write memory
3537 // beyond the given memory regions. But fixing this isn't easy, and most
3538 // people don't care.
3540 // Emit a library call.
3541 TargetLowering::ArgListTy Args;
3542 TargetLowering::ArgListEntry Entry;
3543 Entry.Ty = TLI.getTargetData()->getIntPtrType(*getContext());
3544 Entry.Node = Dst; Args.push_back(Entry);
3545 Entry.Node = Src; Args.push_back(Entry);
3546 Entry.Node = Size; Args.push_back(Entry);
3547 // FIXME: pass in DebugLoc
3548 std::pair<SDValue,SDValue> CallResult =
3549 TLI.LowerCallTo(Chain, Type::getVoidTy(*getContext()),
3550 false, false, false, false, 0,
3551 TLI.getLibcallCallingConv(RTLIB::MEMCPY), false,
3552 /*isReturnValueUsed=*/false,
3553 getExternalSymbol(TLI.getLibcallName(RTLIB::MEMCPY),
3554 TLI.getPointerTy()),
3556 return CallResult.second;
3559 SDValue SelectionDAG::getMemmove(SDValue Chain, DebugLoc dl, SDValue Dst,
3560 SDValue Src, SDValue Size,
3561 unsigned Align, bool isVol,
3562 const Value *DstSV, uint64_t DstSVOff,
3563 const Value *SrcSV, uint64_t SrcSVOff) {
3565 // Check to see if we should lower the memmove to loads and stores first.
3566 // For cases within the target-specified limits, this is the best choice.
3567 ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size);
3569 // Memmove with size zero? Just return the original chain.
3570 if (ConstantSize->isNullValue())
3574 getMemmoveLoadsAndStores(*this, dl, Chain, Dst, Src,
3575 ConstantSize->getZExtValue(), Align, isVol,
3576 false, DstSV, DstSVOff, SrcSV, SrcSVOff);
3577 if (Result.getNode())
3581 // Then check to see if we should lower the memmove with target-specific
3582 // code. If the target chooses to do this, this is the next best.
3584 TSI.EmitTargetCodeForMemmove(*this, dl, Chain, Dst, Src, Size, Align, isVol,
3585 DstSV, DstSVOff, SrcSV, SrcSVOff);
3586 if (Result.getNode())
3589 // FIXME: If the memmove is volatile, lowering it to plain libc memmove may
3590 // not be safe. See memcpy above for more details.
3592 // Emit a library call.
3593 TargetLowering::ArgListTy Args;
3594 TargetLowering::ArgListEntry Entry;
3595 Entry.Ty = TLI.getTargetData()->getIntPtrType(*getContext());
3596 Entry.Node = Dst; Args.push_back(Entry);
3597 Entry.Node = Src; Args.push_back(Entry);
3598 Entry.Node = Size; Args.push_back(Entry);
3599 // FIXME: pass in DebugLoc
3600 std::pair<SDValue,SDValue> CallResult =
3601 TLI.LowerCallTo(Chain, Type::getVoidTy(*getContext()),
3602 false, false, false, false, 0,
3603 TLI.getLibcallCallingConv(RTLIB::MEMMOVE), false,
3604 /*isReturnValueUsed=*/false,
3605 getExternalSymbol(TLI.getLibcallName(RTLIB::MEMMOVE),
3606 TLI.getPointerTy()),
3608 return CallResult.second;
3611 SDValue SelectionDAG::getMemset(SDValue Chain, DebugLoc dl, SDValue Dst,
3612 SDValue Src, SDValue Size,
3613 unsigned Align, bool isVol,
3614 const Value *DstSV, uint64_t DstSVOff) {
3616 // Check to see if we should lower the memset to stores first.
3617 // For cases within the target-specified limits, this is the best choice.
3618 ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size);
3620 // Memset with size zero? Just return the original chain.
3621 if (ConstantSize->isNullValue())
3625 getMemsetStores(*this, dl, Chain, Dst, Src, ConstantSize->getZExtValue(),
3626 Align, isVol, DstSV, DstSVOff);
3628 if (Result.getNode())
3632 // Then check to see if we should lower the memset with target-specific
3633 // code. If the target chooses to do this, this is the next best.
3635 TSI.EmitTargetCodeForMemset(*this, dl, Chain, Dst, Src, Size, Align, isVol,
3637 if (Result.getNode())
3640 // Emit a library call.
3641 const Type *IntPtrTy = TLI.getTargetData()->getIntPtrType(*getContext());
3642 TargetLowering::ArgListTy Args;
3643 TargetLowering::ArgListEntry Entry;
3644 Entry.Node = Dst; Entry.Ty = IntPtrTy;
3645 Args.push_back(Entry);
3646 // Extend or truncate the argument to be an i32 value for the call.
3647 if (Src.getValueType().bitsGT(MVT::i32))
3648 Src = getNode(ISD::TRUNCATE, dl, MVT::i32, Src);
3650 Src = getNode(ISD::ZERO_EXTEND, dl, MVT::i32, Src);
3652 Entry.Ty = Type::getInt32Ty(*getContext());
3653 Entry.isSExt = true;
3654 Args.push_back(Entry);
3656 Entry.Ty = IntPtrTy;
3657 Entry.isSExt = false;
3658 Args.push_back(Entry);
3659 // FIXME: pass in DebugLoc
3660 std::pair<SDValue,SDValue> CallResult =
3661 TLI.LowerCallTo(Chain, Type::getVoidTy(*getContext()),
3662 false, false, false, false, 0,
3663 TLI.getLibcallCallingConv(RTLIB::MEMSET), false,
3664 /*isReturnValueUsed=*/false,
3665 getExternalSymbol(TLI.getLibcallName(RTLIB::MEMSET),
3666 TLI.getPointerTy()),
3668 return CallResult.second;
3671 SDValue SelectionDAG::getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT,
3673 SDValue Ptr, SDValue Cmp,
3674 SDValue Swp, const Value* PtrVal,
3675 unsigned Alignment) {
3676 if (Alignment == 0) // Ensure that codegen never sees alignment 0
3677 Alignment = getEVTAlignment(MemVT);
3679 // Check if the memory reference references a frame index
3681 if (const FrameIndexSDNode *FI =
3682 dyn_cast<const FrameIndexSDNode>(Ptr.getNode()))
3683 PtrVal = PseudoSourceValue::getFixedStack(FI->getIndex());
3685 MachineFunction &MF = getMachineFunction();
3686 unsigned Flags = MachineMemOperand::MOLoad | MachineMemOperand::MOStore;
3688 // For now, atomics are considered to be volatile always.
3689 Flags |= MachineMemOperand::MOVolatile;
3691 MachineMemOperand *MMO =
3692 MF.getMachineMemOperand(PtrVal, Flags, 0,
3693 MemVT.getStoreSize(), Alignment);
3695 return getAtomic(Opcode, dl, MemVT, Chain, Ptr, Cmp, Swp, MMO);
3698 SDValue SelectionDAG::getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT,
3700 SDValue Ptr, SDValue Cmp,
3701 SDValue Swp, MachineMemOperand *MMO) {
3702 assert(Opcode == ISD::ATOMIC_CMP_SWAP && "Invalid Atomic Op");
3703 assert(Cmp.getValueType() == Swp.getValueType() && "Invalid Atomic Op Types");
3705 EVT VT = Cmp.getValueType();
3707 SDVTList VTs = getVTList(VT, MVT::Other);
3708 FoldingSetNodeID ID;
3709 ID.AddInteger(MemVT.getRawBits());
3710 SDValue Ops[] = {Chain, Ptr, Cmp, Swp};
3711 AddNodeIDNode(ID, Opcode, VTs, Ops, 4);
3713 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) {
3714 cast<AtomicSDNode>(E)->refineAlignment(MMO);
3715 return SDValue(E, 0);
3717 SDNode *N = new (NodeAllocator) AtomicSDNode(Opcode, dl, VTs, MemVT, Chain,
3718 Ptr, Cmp, Swp, MMO);
3719 CSEMap.InsertNode(N, IP);
3720 AllNodes.push_back(N);
3721 return SDValue(N, 0);
3724 SDValue SelectionDAG::getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT,
3726 SDValue Ptr, SDValue Val,
3727 const Value* PtrVal,
3728 unsigned Alignment) {
3729 if (Alignment == 0) // Ensure that codegen never sees alignment 0
3730 Alignment = getEVTAlignment(MemVT);
3732 // Check if the memory reference references a frame index
3734 if (const FrameIndexSDNode *FI =
3735 dyn_cast<const FrameIndexSDNode>(Ptr.getNode()))
3736 PtrVal = PseudoSourceValue::getFixedStack(FI->getIndex());
3738 MachineFunction &MF = getMachineFunction();
3739 unsigned Flags = MachineMemOperand::MOLoad | MachineMemOperand::MOStore;
3741 // For now, atomics are considered to be volatile always.
3742 Flags |= MachineMemOperand::MOVolatile;
3744 MachineMemOperand *MMO =
3745 MF.getMachineMemOperand(PtrVal, Flags, 0,
3746 MemVT.getStoreSize(), Alignment);
3748 return getAtomic(Opcode, dl, MemVT, Chain, Ptr, Val, MMO);
3751 SDValue SelectionDAG::getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT,
3753 SDValue Ptr, SDValue Val,
3754 MachineMemOperand *MMO) {
3755 assert((Opcode == ISD::ATOMIC_LOAD_ADD ||
3756 Opcode == ISD::ATOMIC_LOAD_SUB ||
3757 Opcode == ISD::ATOMIC_LOAD_AND ||
3758 Opcode == ISD::ATOMIC_LOAD_OR ||
3759 Opcode == ISD::ATOMIC_LOAD_XOR ||
3760 Opcode == ISD::ATOMIC_LOAD_NAND ||
3761 Opcode == ISD::ATOMIC_LOAD_MIN ||
3762 Opcode == ISD::ATOMIC_LOAD_MAX ||
3763 Opcode == ISD::ATOMIC_LOAD_UMIN ||
3764 Opcode == ISD::ATOMIC_LOAD_UMAX ||
3765 Opcode == ISD::ATOMIC_SWAP) &&
3766 "Invalid Atomic Op");
3768 EVT VT = Val.getValueType();
3770 SDVTList VTs = getVTList(VT, MVT::Other);
3771 FoldingSetNodeID ID;
3772 ID.AddInteger(MemVT.getRawBits());
3773 SDValue Ops[] = {Chain, Ptr, Val};
3774 AddNodeIDNode(ID, Opcode, VTs, Ops, 3);
3776 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) {
3777 cast<AtomicSDNode>(E)->refineAlignment(MMO);
3778 return SDValue(E, 0);
3780 SDNode *N = new (NodeAllocator) AtomicSDNode(Opcode, dl, VTs, MemVT, Chain,
3782 CSEMap.InsertNode(N, IP);
3783 AllNodes.push_back(N);
3784 return SDValue(N, 0);
3787 /// getMergeValues - Create a MERGE_VALUES node from the given operands.
3788 /// Allowed to return something different (and simpler) if Simplify is true.
3789 SDValue SelectionDAG::getMergeValues(const SDValue *Ops, unsigned NumOps,
3794 SmallVector<EVT, 4> VTs;
3795 VTs.reserve(NumOps);
3796 for (unsigned i = 0; i < NumOps; ++i)
3797 VTs.push_back(Ops[i].getValueType());
3798 return getNode(ISD::MERGE_VALUES, dl, getVTList(&VTs[0], NumOps),
3803 SelectionDAG::getMemIntrinsicNode(unsigned Opcode, DebugLoc dl,
3804 const EVT *VTs, unsigned NumVTs,
3805 const SDValue *Ops, unsigned NumOps,
3806 EVT MemVT, const Value *srcValue, int SVOff,
3807 unsigned Align, bool Vol,
3808 bool ReadMem, bool WriteMem) {
3809 return getMemIntrinsicNode(Opcode, dl, makeVTList(VTs, NumVTs), Ops, NumOps,
3810 MemVT, srcValue, SVOff, Align, Vol,
3815 SelectionDAG::getMemIntrinsicNode(unsigned Opcode, DebugLoc dl, SDVTList VTList,
3816 const SDValue *Ops, unsigned NumOps,
3817 EVT MemVT, const Value *srcValue, int SVOff,
3818 unsigned Align, bool Vol,
3819 bool ReadMem, bool WriteMem) {
3820 if (Align == 0) // Ensure that codegen never sees alignment 0
3821 Align = getEVTAlignment(MemVT);
3823 MachineFunction &MF = getMachineFunction();
3826 Flags |= MachineMemOperand::MOStore;
3828 Flags |= MachineMemOperand::MOLoad;
3830 Flags |= MachineMemOperand::MOVolatile;
3831 MachineMemOperand *MMO =
3832 MF.getMachineMemOperand(srcValue, Flags, SVOff,
3833 MemVT.getStoreSize(), Align);
3835 return getMemIntrinsicNode(Opcode, dl, VTList, Ops, NumOps, MemVT, MMO);
3839 SelectionDAG::getMemIntrinsicNode(unsigned Opcode, DebugLoc dl, SDVTList VTList,
3840 const SDValue *Ops, unsigned NumOps,
3841 EVT MemVT, MachineMemOperand *MMO) {
3842 assert((Opcode == ISD::INTRINSIC_VOID ||
3843 Opcode == ISD::INTRINSIC_W_CHAIN ||
3844 (Opcode <= INT_MAX &&
3845 (int)Opcode >= ISD::FIRST_TARGET_MEMORY_OPCODE)) &&
3846 "Opcode is not a memory-accessing opcode!");
3848 // Memoize the node unless it returns a flag.
3849 MemIntrinsicSDNode *N;
3850 if (VTList.VTs[VTList.NumVTs-1] != MVT::Flag) {
3851 FoldingSetNodeID ID;
3852 AddNodeIDNode(ID, Opcode, VTList, Ops, NumOps);
3854 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) {
3855 cast<MemIntrinsicSDNode>(E)->refineAlignment(MMO);
3856 return SDValue(E, 0);
3859 N = new (NodeAllocator) MemIntrinsicSDNode(Opcode, dl, VTList, Ops, NumOps,
3861 CSEMap.InsertNode(N, IP);
3863 N = new (NodeAllocator) MemIntrinsicSDNode(Opcode, dl, VTList, Ops, NumOps,
3866 AllNodes.push_back(N);
3867 return SDValue(N, 0);
3871 SelectionDAG::getLoad(ISD::MemIndexedMode AM, ISD::LoadExtType ExtType,
3872 EVT VT, DebugLoc dl, SDValue Chain,
3873 SDValue Ptr, SDValue Offset,
3874 const Value *SV, int SVOffset, EVT MemVT,
3875 bool isVolatile, bool isNonTemporal,
3876 unsigned Alignment) {
3877 if (Alignment == 0) // Ensure that codegen never sees alignment 0
3878 Alignment = getEVTAlignment(VT);
3880 // Check if the memory reference references a frame index
3882 if (const FrameIndexSDNode *FI =
3883 dyn_cast<const FrameIndexSDNode>(Ptr.getNode()))
3884 SV = PseudoSourceValue::getFixedStack(FI->getIndex());
3886 MachineFunction &MF = getMachineFunction();
3887 unsigned Flags = MachineMemOperand::MOLoad;
3889 Flags |= MachineMemOperand::MOVolatile;
3891 Flags |= MachineMemOperand::MONonTemporal;
3892 MachineMemOperand *MMO =
3893 MF.getMachineMemOperand(SV, Flags, SVOffset,
3894 MemVT.getStoreSize(), Alignment);
3895 return getLoad(AM, ExtType, VT, dl, Chain, Ptr, Offset, MemVT, MMO);
3899 SelectionDAG::getLoad(ISD::MemIndexedMode AM, ISD::LoadExtType ExtType,
3900 EVT VT, DebugLoc dl, SDValue Chain,
3901 SDValue Ptr, SDValue Offset, EVT MemVT,
3902 MachineMemOperand *MMO) {
3904 ExtType = ISD::NON_EXTLOAD;
3905 } else if (ExtType == ISD::NON_EXTLOAD) {
3906 assert(VT == MemVT && "Non-extending load from different memory type!");
3909 assert(MemVT.getScalarType().bitsLT(VT.getScalarType()) &&
3910 "Should only be an extending load, not truncating!");
3911 assert(VT.isInteger() == MemVT.isInteger() &&
3912 "Cannot convert from FP to Int or Int -> FP!");
3913 assert(VT.isVector() == MemVT.isVector() &&
3914 "Cannot use trunc store to convert to or from a vector!");
3915 assert((!VT.isVector() ||
3916 VT.getVectorNumElements() == MemVT.getVectorNumElements()) &&
3917 "Cannot use trunc store to change the number of vector elements!");
3920 bool Indexed = AM != ISD::UNINDEXED;
3921 assert((Indexed || Offset.getOpcode() == ISD::UNDEF) &&
3922 "Unindexed load with an offset!");
3924 SDVTList VTs = Indexed ?
3925 getVTList(VT, Ptr.getValueType(), MVT::Other) : getVTList(VT, MVT::Other);
3926 SDValue Ops[] = { Chain, Ptr, Offset };
3927 FoldingSetNodeID ID;
3928 AddNodeIDNode(ID, ISD::LOAD, VTs, Ops, 3);
3929 ID.AddInteger(MemVT.getRawBits());
3930 ID.AddInteger(encodeMemSDNodeFlags(ExtType, AM, MMO->isVolatile(),
3931 MMO->isNonTemporal()));
3933 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) {
3934 cast<LoadSDNode>(E)->refineAlignment(MMO);
3935 return SDValue(E, 0);
3937 SDNode *N = new (NodeAllocator) LoadSDNode(Ops, dl, VTs, AM, ExtType,
3939 CSEMap.InsertNode(N, IP);
3940 AllNodes.push_back(N);
3941 return SDValue(N, 0);
3944 SDValue SelectionDAG::getLoad(EVT VT, DebugLoc dl,
3945 SDValue Chain, SDValue Ptr,
3946 const Value *SV, int SVOffset,
3947 bool isVolatile, bool isNonTemporal,
3948 unsigned Alignment) {
3949 SDValue Undef = getUNDEF(Ptr.getValueType());
3950 return getLoad(ISD::UNINDEXED, ISD::NON_EXTLOAD, VT, dl, Chain, Ptr, Undef,
3951 SV, SVOffset, VT, isVolatile, isNonTemporal, Alignment);
3954 SDValue SelectionDAG::getExtLoad(ISD::LoadExtType ExtType, EVT VT, DebugLoc dl,
3955 SDValue Chain, SDValue Ptr,
3957 int SVOffset, EVT MemVT,
3958 bool isVolatile, bool isNonTemporal,
3959 unsigned Alignment) {
3960 SDValue Undef = getUNDEF(Ptr.getValueType());
3961 return getLoad(ISD::UNINDEXED, ExtType, VT, dl, Chain, Ptr, Undef,
3962 SV, SVOffset, MemVT, isVolatile, isNonTemporal, Alignment);
3966 SelectionDAG::getIndexedLoad(SDValue OrigLoad, DebugLoc dl, SDValue Base,
3967 SDValue Offset, ISD::MemIndexedMode AM) {
3968 LoadSDNode *LD = cast<LoadSDNode>(OrigLoad);
3969 assert(LD->getOffset().getOpcode() == ISD::UNDEF &&
3970 "Load is already a indexed load!");
3971 return getLoad(AM, LD->getExtensionType(), OrigLoad.getValueType(), dl,
3972 LD->getChain(), Base, Offset, LD->getSrcValue(),
3973 LD->getSrcValueOffset(), LD->getMemoryVT(),
3974 LD->isVolatile(), LD->isNonTemporal(), LD->getAlignment());
3977 SDValue SelectionDAG::getStore(SDValue Chain, DebugLoc dl, SDValue Val,
3978 SDValue Ptr, const Value *SV, int SVOffset,
3979 bool isVolatile, bool isNonTemporal,
3980 unsigned Alignment) {
3981 if (Alignment == 0) // Ensure that codegen never sees alignment 0
3982 Alignment = getEVTAlignment(Val.getValueType());
3984 // Check if the memory reference references a frame index
3986 if (const FrameIndexSDNode *FI =
3987 dyn_cast<const FrameIndexSDNode>(Ptr.getNode()))
3988 SV = PseudoSourceValue::getFixedStack(FI->getIndex());
3990 MachineFunction &MF = getMachineFunction();
3991 unsigned Flags = MachineMemOperand::MOStore;
3993 Flags |= MachineMemOperand::MOVolatile;
3995 Flags |= MachineMemOperand::MONonTemporal;
3996 MachineMemOperand *MMO =
3997 MF.getMachineMemOperand(SV, Flags, SVOffset,
3998 Val.getValueType().getStoreSize(), Alignment);
4000 return getStore(Chain, dl, Val, Ptr, MMO);
4003 SDValue SelectionDAG::getStore(SDValue Chain, DebugLoc dl, SDValue Val,
4004 SDValue Ptr, MachineMemOperand *MMO) {
4005 EVT VT = Val.getValueType();
4006 SDVTList VTs = getVTList(MVT::Other);
4007 SDValue Undef = getUNDEF(Ptr.getValueType());
4008 SDValue Ops[] = { Chain, Val, Ptr, Undef };
4009 FoldingSetNodeID ID;
4010 AddNodeIDNode(ID, ISD::STORE, VTs, Ops, 4);
4011 ID.AddInteger(VT.getRawBits());
4012 ID.AddInteger(encodeMemSDNodeFlags(false, ISD::UNINDEXED, MMO->isVolatile(),
4013 MMO->isNonTemporal()));
4015 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) {
4016 cast<StoreSDNode>(E)->refineAlignment(MMO);
4017 return SDValue(E, 0);
4019 SDNode *N = new (NodeAllocator) StoreSDNode(Ops, dl, VTs, ISD::UNINDEXED,
4021 CSEMap.InsertNode(N, IP);
4022 AllNodes.push_back(N);
4023 return SDValue(N, 0);
4026 SDValue SelectionDAG::getTruncStore(SDValue Chain, DebugLoc dl, SDValue Val,
4027 SDValue Ptr, const Value *SV,
4028 int SVOffset, EVT SVT,
4029 bool isVolatile, bool isNonTemporal,
4030 unsigned Alignment) {
4031 if (Alignment == 0) // Ensure that codegen never sees alignment 0
4032 Alignment = getEVTAlignment(SVT);
4034 // Check if the memory reference references a frame index
4036 if (const FrameIndexSDNode *FI =
4037 dyn_cast<const FrameIndexSDNode>(Ptr.getNode()))
4038 SV = PseudoSourceValue::getFixedStack(FI->getIndex());
4040 MachineFunction &MF = getMachineFunction();
4041 unsigned Flags = MachineMemOperand::MOStore;
4043 Flags |= MachineMemOperand::MOVolatile;
4045 Flags |= MachineMemOperand::MONonTemporal;
4046 MachineMemOperand *MMO =
4047 MF.getMachineMemOperand(SV, Flags, SVOffset, SVT.getStoreSize(), Alignment);
4049 return getTruncStore(Chain, dl, Val, Ptr, SVT, MMO);
4052 SDValue SelectionDAG::getTruncStore(SDValue Chain, DebugLoc dl, SDValue Val,
4053 SDValue Ptr, EVT SVT,
4054 MachineMemOperand *MMO) {
4055 EVT VT = Val.getValueType();
4058 return getStore(Chain, dl, Val, Ptr, MMO);
4060 assert(SVT.getScalarType().bitsLT(VT.getScalarType()) &&
4061 "Should only be a truncating store, not extending!");
4062 assert(VT.isInteger() == SVT.isInteger() &&
4063 "Can't do FP-INT conversion!");
4064 assert(VT.isVector() == SVT.isVector() &&
4065 "Cannot use trunc store to convert to or from a vector!");
4066 assert((!VT.isVector() ||
4067 VT.getVectorNumElements() == SVT.getVectorNumElements()) &&
4068 "Cannot use trunc store to change the number of vector elements!");
4070 SDVTList VTs = getVTList(MVT::Other);
4071 SDValue Undef = getUNDEF(Ptr.getValueType());
4072 SDValue Ops[] = { Chain, Val, Ptr, Undef };
4073 FoldingSetNodeID ID;
4074 AddNodeIDNode(ID, ISD::STORE, VTs, Ops, 4);
4075 ID.AddInteger(SVT.getRawBits());
4076 ID.AddInteger(encodeMemSDNodeFlags(true, ISD::UNINDEXED, MMO->isVolatile(),
4077 MMO->isNonTemporal()));
4079 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) {
4080 cast<StoreSDNode>(E)->refineAlignment(MMO);
4081 return SDValue(E, 0);
4083 SDNode *N = new (NodeAllocator) StoreSDNode(Ops, dl, VTs, ISD::UNINDEXED,
4085 CSEMap.InsertNode(N, IP);
4086 AllNodes.push_back(N);
4087 return SDValue(N, 0);
4091 SelectionDAG::getIndexedStore(SDValue OrigStore, DebugLoc dl, SDValue Base,
4092 SDValue Offset, ISD::MemIndexedMode AM) {
4093 StoreSDNode *ST = cast<StoreSDNode>(OrigStore);
4094 assert(ST->getOffset().getOpcode() == ISD::UNDEF &&
4095 "Store is already a indexed store!");
4096 SDVTList VTs = getVTList(Base.getValueType(), MVT::Other);
4097 SDValue Ops[] = { ST->getChain(), ST->getValue(), Base, Offset };
4098 FoldingSetNodeID ID;
4099 AddNodeIDNode(ID, ISD::STORE, VTs, Ops, 4);
4100 ID.AddInteger(ST->getMemoryVT().getRawBits());
4101 ID.AddInteger(ST->getRawSubclassData());
4103 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
4104 return SDValue(E, 0);
4106 SDNode *N = new (NodeAllocator) StoreSDNode(Ops, dl, VTs, AM,
4107 ST->isTruncatingStore(),
4109 ST->getMemOperand());
4110 CSEMap.InsertNode(N, IP);
4111 AllNodes.push_back(N);
4112 return SDValue(N, 0);
4115 SDValue SelectionDAG::getVAArg(EVT VT, DebugLoc dl,
4116 SDValue Chain, SDValue Ptr,
4119 SDValue Ops[] = { Chain, Ptr, SV, getTargetConstant(Align, MVT::i32) };
4120 return getNode(ISD::VAARG, dl, getVTList(VT, MVT::Other), Ops, 4);
4123 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT,
4124 const SDUse *Ops, unsigned NumOps) {
4126 case 0: return getNode(Opcode, DL, VT);
4127 case 1: return getNode(Opcode, DL, VT, Ops[0]);
4128 case 2: return getNode(Opcode, DL, VT, Ops[0], Ops[1]);
4129 case 3: return getNode(Opcode, DL, VT, Ops[0], Ops[1], Ops[2]);
4133 // Copy from an SDUse array into an SDValue array for use with
4134 // the regular getNode logic.
4135 SmallVector<SDValue, 8> NewOps(Ops, Ops + NumOps);
4136 return getNode(Opcode, DL, VT, &NewOps[0], NumOps);
4139 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT,
4140 const SDValue *Ops, unsigned NumOps) {
4142 case 0: return getNode(Opcode, DL, VT);
4143 case 1: return getNode(Opcode, DL, VT, Ops[0]);
4144 case 2: return getNode(Opcode, DL, VT, Ops[0], Ops[1]);
4145 case 3: return getNode(Opcode, DL, VT, Ops[0], Ops[1], Ops[2]);
4151 case ISD::SELECT_CC: {
4152 assert(NumOps == 5 && "SELECT_CC takes 5 operands!");
4153 assert(Ops[0].getValueType() == Ops[1].getValueType() &&
4154 "LHS and RHS of condition must have same type!");
4155 assert(Ops[2].getValueType() == Ops[3].getValueType() &&
4156 "True and False arms of SelectCC must have same type!");
4157 assert(Ops[2].getValueType() == VT &&
4158 "select_cc node must be of same type as true and false value!");
4162 assert(NumOps == 5 && "BR_CC takes 5 operands!");
4163 assert(Ops[2].getValueType() == Ops[3].getValueType() &&
4164 "LHS/RHS of comparison should match types!");
4171 SDVTList VTs = getVTList(VT);
4173 if (VT != MVT::Flag) {
4174 FoldingSetNodeID ID;
4175 AddNodeIDNode(ID, Opcode, VTs, Ops, NumOps);
4178 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
4179 return SDValue(E, 0);
4181 N = new (NodeAllocator) SDNode(Opcode, DL, VTs, Ops, NumOps);
4182 CSEMap.InsertNode(N, IP);
4184 N = new (NodeAllocator) SDNode(Opcode, DL, VTs, Ops, NumOps);
4187 AllNodes.push_back(N);
4191 return SDValue(N, 0);
4194 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL,
4195 const std::vector<EVT> &ResultTys,
4196 const SDValue *Ops, unsigned NumOps) {
4197 return getNode(Opcode, DL, getVTList(&ResultTys[0], ResultTys.size()),
4201 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL,
4202 const EVT *VTs, unsigned NumVTs,
4203 const SDValue *Ops, unsigned NumOps) {
4205 return getNode(Opcode, DL, VTs[0], Ops, NumOps);
4206 return getNode(Opcode, DL, makeVTList(VTs, NumVTs), Ops, NumOps);
4209 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList,
4210 const SDValue *Ops, unsigned NumOps) {
4211 if (VTList.NumVTs == 1)
4212 return getNode(Opcode, DL, VTList.VTs[0], Ops, NumOps);
4216 // FIXME: figure out how to safely handle things like
4217 // int foo(int x) { return 1 << (x & 255); }
4218 // int bar() { return foo(256); }
4219 case ISD::SRA_PARTS:
4220 case ISD::SRL_PARTS:
4221 case ISD::SHL_PARTS:
4222 if (N3.getOpcode() == ISD::SIGN_EXTEND_INREG &&
4223 cast<VTSDNode>(N3.getOperand(1))->getVT() != MVT::i1)
4224 return getNode(Opcode, DL, VT, N1, N2, N3.getOperand(0));
4225 else if (N3.getOpcode() == ISD::AND)
4226 if (ConstantSDNode *AndRHS = dyn_cast<ConstantSDNode>(N3.getOperand(1))) {
4227 // If the and is only masking out bits that cannot effect the shift,
4228 // eliminate the and.
4229 unsigned NumBits = VT.getScalarType().getSizeInBits()*2;
4230 if ((AndRHS->getValue() & (NumBits-1)) == NumBits-1)
4231 return getNode(Opcode, DL, VT, N1, N2, N3.getOperand(0));
4237 // Memoize the node unless it returns a flag.
4239 if (VTList.VTs[VTList.NumVTs-1] != MVT::Flag) {
4240 FoldingSetNodeID ID;
4241 AddNodeIDNode(ID, Opcode, VTList, Ops, NumOps);
4243 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
4244 return SDValue(E, 0);
4247 N = new (NodeAllocator) UnarySDNode(Opcode, DL, VTList, Ops[0]);
4248 } else if (NumOps == 2) {
4249 N = new (NodeAllocator) BinarySDNode(Opcode, DL, VTList, Ops[0], Ops[1]);
4250 } else if (NumOps == 3) {
4251 N = new (NodeAllocator) TernarySDNode(Opcode, DL, VTList, Ops[0], Ops[1],
4254 N = new (NodeAllocator) SDNode(Opcode, DL, VTList, Ops, NumOps);
4256 CSEMap.InsertNode(N, IP);
4259 N = new (NodeAllocator) UnarySDNode(Opcode, DL, VTList, Ops[0]);
4260 } else if (NumOps == 2) {
4261 N = new (NodeAllocator) BinarySDNode(Opcode, DL, VTList, Ops[0], Ops[1]);
4262 } else if (NumOps == 3) {
4263 N = new (NodeAllocator) TernarySDNode(Opcode, DL, VTList, Ops[0], Ops[1],
4266 N = new (NodeAllocator) SDNode(Opcode, DL, VTList, Ops, NumOps);
4269 AllNodes.push_back(N);
4273 return SDValue(N, 0);
4276 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList) {
4277 return getNode(Opcode, DL, VTList, 0, 0);
4280 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList,
4282 SDValue Ops[] = { N1 };
4283 return getNode(Opcode, DL, VTList, Ops, 1);
4286 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList,
4287 SDValue N1, SDValue N2) {
4288 SDValue Ops[] = { N1, N2 };
4289 return getNode(Opcode, DL, VTList, Ops, 2);
4292 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList,
4293 SDValue N1, SDValue N2, SDValue N3) {
4294 SDValue Ops[] = { N1, N2, N3 };
4295 return getNode(Opcode, DL, VTList, Ops, 3);
4298 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList,
4299 SDValue N1, SDValue N2, SDValue N3,
4301 SDValue Ops[] = { N1, N2, N3, N4 };
4302 return getNode(Opcode, DL, VTList, Ops, 4);
4305 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList,
4306 SDValue N1, SDValue N2, SDValue N3,
4307 SDValue N4, SDValue N5) {
4308 SDValue Ops[] = { N1, N2, N3, N4, N5 };
4309 return getNode(Opcode, DL, VTList, Ops, 5);
4312 SDVTList SelectionDAG::getVTList(EVT VT) {
4313 return makeVTList(SDNode::getValueTypeList(VT), 1);
4316 SDVTList SelectionDAG::getVTList(EVT VT1, EVT VT2) {
4317 for (std::vector<SDVTList>::reverse_iterator I = VTList.rbegin(),
4318 E = VTList.rend(); I != E; ++I)
4319 if (I->NumVTs == 2 && I->VTs[0] == VT1 && I->VTs[1] == VT2)
4322 EVT *Array = Allocator.Allocate<EVT>(2);
4325 SDVTList Result = makeVTList(Array, 2);
4326 VTList.push_back(Result);
4330 SDVTList SelectionDAG::getVTList(EVT VT1, EVT VT2, EVT VT3) {
4331 for (std::vector<SDVTList>::reverse_iterator I = VTList.rbegin(),
4332 E = VTList.rend(); I != E; ++I)
4333 if (I->NumVTs == 3 && I->VTs[0] == VT1 && I->VTs[1] == VT2 &&
4337 EVT *Array = Allocator.Allocate<EVT>(3);
4341 SDVTList Result = makeVTList(Array, 3);
4342 VTList.push_back(Result);
4346 SDVTList SelectionDAG::getVTList(EVT VT1, EVT VT2, EVT VT3, EVT VT4) {
4347 for (std::vector<SDVTList>::reverse_iterator I = VTList.rbegin(),
4348 E = VTList.rend(); I != E; ++I)
4349 if (I->NumVTs == 4 && I->VTs[0] == VT1 && I->VTs[1] == VT2 &&
4350 I->VTs[2] == VT3 && I->VTs[3] == VT4)
4353 EVT *Array = Allocator.Allocate<EVT>(4);
4358 SDVTList Result = makeVTList(Array, 4);
4359 VTList.push_back(Result);
4363 SDVTList SelectionDAG::getVTList(const EVT *VTs, unsigned NumVTs) {
4365 case 0: llvm_unreachable("Cannot have nodes without results!");
4366 case 1: return getVTList(VTs[0]);
4367 case 2: return getVTList(VTs[0], VTs[1]);
4368 case 3: return getVTList(VTs[0], VTs[1], VTs[2]);
4369 case 4: return getVTList(VTs[0], VTs[1], VTs[2], VTs[3]);
4373 for (std::vector<SDVTList>::reverse_iterator I = VTList.rbegin(),
4374 E = VTList.rend(); I != E; ++I) {
4375 if (I->NumVTs != NumVTs || VTs[0] != I->VTs[0] || VTs[1] != I->VTs[1])
4378 bool NoMatch = false;
4379 for (unsigned i = 2; i != NumVTs; ++i)
4380 if (VTs[i] != I->VTs[i]) {
4388 EVT *Array = Allocator.Allocate<EVT>(NumVTs);
4389 std::copy(VTs, VTs+NumVTs, Array);
4390 SDVTList Result = makeVTList(Array, NumVTs);
4391 VTList.push_back(Result);
4396 /// UpdateNodeOperands - *Mutate* the specified node in-place to have the
4397 /// specified operands. If the resultant node already exists in the DAG,
4398 /// this does not modify the specified node, instead it returns the node that
4399 /// already exists. If the resultant node does not exist in the DAG, the
4400 /// input node is returned. As a degenerate case, if you specify the same
4401 /// input operands as the node already has, the input node is returned.
4402 SDNode *SelectionDAG::UpdateNodeOperands(SDNode *N, SDValue Op) {
4403 assert(N->getNumOperands() == 1 && "Update with wrong number of operands");
4405 // Check to see if there is no change.
4406 if (Op == N->getOperand(0)) return N;
4408 // See if the modified node already exists.
4409 void *InsertPos = 0;
4410 if (SDNode *Existing = FindModifiedNodeSlot(N, Op, InsertPos))
4413 // Nope it doesn't. Remove the node from its current place in the maps.
4415 if (!RemoveNodeFromCSEMaps(N))
4418 // Now we update the operands.
4419 N->OperandList[0].set(Op);
4421 // If this gets put into a CSE map, add it.
4422 if (InsertPos) CSEMap.InsertNode(N, InsertPos);
4426 SDNode *SelectionDAG::UpdateNodeOperands(SDNode *N, SDValue Op1, SDValue Op2) {
4427 assert(N->getNumOperands() == 2 && "Update with wrong number of operands");
4429 // Check to see if there is no change.
4430 if (Op1 == N->getOperand(0) && Op2 == N->getOperand(1))
4431 return N; // No operands changed, just return the input node.
4433 // See if the modified node already exists.
4434 void *InsertPos = 0;
4435 if (SDNode *Existing = FindModifiedNodeSlot(N, Op1, Op2, InsertPos))
4438 // Nope it doesn't. Remove the node from its current place in the maps.
4440 if (!RemoveNodeFromCSEMaps(N))
4443 // Now we update the operands.
4444 if (N->OperandList[0] != Op1)
4445 N->OperandList[0].set(Op1);
4446 if (N->OperandList[1] != Op2)
4447 N->OperandList[1].set(Op2);
4449 // If this gets put into a CSE map, add it.
4450 if (InsertPos) CSEMap.InsertNode(N, InsertPos);
4454 SDNode *SelectionDAG::
4455 UpdateNodeOperands(SDNode *N, SDValue Op1, SDValue Op2, SDValue Op3) {
4456 SDValue Ops[] = { Op1, Op2, Op3 };
4457 return UpdateNodeOperands(N, Ops, 3);
4460 SDNode *SelectionDAG::
4461 UpdateNodeOperands(SDNode *N, SDValue Op1, SDValue Op2,
4462 SDValue Op3, SDValue Op4) {
4463 SDValue Ops[] = { Op1, Op2, Op3, Op4 };
4464 return UpdateNodeOperands(N, Ops, 4);
4467 SDNode *SelectionDAG::
4468 UpdateNodeOperands(SDNode *N, SDValue Op1, SDValue Op2,
4469 SDValue Op3, SDValue Op4, SDValue Op5) {
4470 SDValue Ops[] = { Op1, Op2, Op3, Op4, Op5 };
4471 return UpdateNodeOperands(N, Ops, 5);
4474 SDNode *SelectionDAG::
4475 UpdateNodeOperands(SDNode *N, const SDValue *Ops, unsigned NumOps) {
4476 assert(N->getNumOperands() == NumOps &&
4477 "Update with wrong number of operands");
4479 // Check to see if there is no change.
4480 bool AnyChange = false;
4481 for (unsigned i = 0; i != NumOps; ++i) {
4482 if (Ops[i] != N->getOperand(i)) {
4488 // No operands changed, just return the input node.
4489 if (!AnyChange) return N;
4491 // See if the modified node already exists.
4492 void *InsertPos = 0;
4493 if (SDNode *Existing = FindModifiedNodeSlot(N, Ops, NumOps, InsertPos))
4496 // Nope it doesn't. Remove the node from its current place in the maps.
4498 if (!RemoveNodeFromCSEMaps(N))
4501 // Now we update the operands.
4502 for (unsigned i = 0; i != NumOps; ++i)
4503 if (N->OperandList[i] != Ops[i])
4504 N->OperandList[i].set(Ops[i]);
4506 // If this gets put into a CSE map, add it.
4507 if (InsertPos) CSEMap.InsertNode(N, InsertPos);
4511 /// DropOperands - Release the operands and set this node to have
4513 void SDNode::DropOperands() {
4514 // Unlike the code in MorphNodeTo that does this, we don't need to
4515 // watch for dead nodes here.
4516 for (op_iterator I = op_begin(), E = op_end(); I != E; ) {
4522 /// SelectNodeTo - These are wrappers around MorphNodeTo that accept a
4525 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4527 SDVTList VTs = getVTList(VT);
4528 return SelectNodeTo(N, MachineOpc, VTs, 0, 0);
4531 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4532 EVT VT, SDValue Op1) {
4533 SDVTList VTs = getVTList(VT);
4534 SDValue Ops[] = { Op1 };
4535 return SelectNodeTo(N, MachineOpc, VTs, Ops, 1);
4538 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4539 EVT VT, SDValue Op1,
4541 SDVTList VTs = getVTList(VT);
4542 SDValue Ops[] = { Op1, Op2 };
4543 return SelectNodeTo(N, MachineOpc, VTs, Ops, 2);
4546 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4547 EVT VT, SDValue Op1,
4548 SDValue Op2, SDValue Op3) {
4549 SDVTList VTs = getVTList(VT);
4550 SDValue Ops[] = { Op1, Op2, Op3 };
4551 return SelectNodeTo(N, MachineOpc, VTs, Ops, 3);
4554 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4555 EVT VT, const SDValue *Ops,
4557 SDVTList VTs = getVTList(VT);
4558 return SelectNodeTo(N, MachineOpc, VTs, Ops, NumOps);
4561 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4562 EVT VT1, EVT VT2, const SDValue *Ops,
4564 SDVTList VTs = getVTList(VT1, VT2);
4565 return SelectNodeTo(N, MachineOpc, VTs, Ops, NumOps);
4568 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4570 SDVTList VTs = getVTList(VT1, VT2);
4571 return SelectNodeTo(N, MachineOpc, VTs, (SDValue *)0, 0);
4574 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4575 EVT VT1, EVT VT2, EVT VT3,
4576 const SDValue *Ops, unsigned NumOps) {
4577 SDVTList VTs = getVTList(VT1, VT2, VT3);
4578 return SelectNodeTo(N, MachineOpc, VTs, Ops, NumOps);
4581 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4582 EVT VT1, EVT VT2, EVT VT3, EVT VT4,
4583 const SDValue *Ops, unsigned NumOps) {
4584 SDVTList VTs = getVTList(VT1, VT2, VT3, VT4);
4585 return SelectNodeTo(N, MachineOpc, VTs, Ops, NumOps);
4588 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4591 SDVTList VTs = getVTList(VT1, VT2);
4592 SDValue Ops[] = { Op1 };
4593 return SelectNodeTo(N, MachineOpc, VTs, Ops, 1);
4596 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4598 SDValue Op1, SDValue Op2) {
4599 SDVTList VTs = getVTList(VT1, VT2);
4600 SDValue Ops[] = { Op1, Op2 };
4601 return SelectNodeTo(N, MachineOpc, VTs, Ops, 2);
4604 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4606 SDValue Op1, SDValue Op2,
4608 SDVTList VTs = getVTList(VT1, VT2);
4609 SDValue Ops[] = { Op1, Op2, Op3 };
4610 return SelectNodeTo(N, MachineOpc, VTs, Ops, 3);
4613 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4614 EVT VT1, EVT VT2, EVT VT3,
4615 SDValue Op1, SDValue Op2,
4617 SDVTList VTs = getVTList(VT1, VT2, VT3);
4618 SDValue Ops[] = { Op1, Op2, Op3 };
4619 return SelectNodeTo(N, MachineOpc, VTs, Ops, 3);
4622 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4623 SDVTList VTs, const SDValue *Ops,
4625 N = MorphNodeTo(N, ~MachineOpc, VTs, Ops, NumOps);
4626 // Reset the NodeID to -1.
4631 /// MorphNodeTo - This *mutates* the specified node to have the specified
4632 /// return type, opcode, and operands.
4634 /// Note that MorphNodeTo returns the resultant node. If there is already a
4635 /// node of the specified opcode and operands, it returns that node instead of
4636 /// the current one. Note that the DebugLoc need not be the same.
4638 /// Using MorphNodeTo is faster than creating a new node and swapping it in
4639 /// with ReplaceAllUsesWith both because it often avoids allocating a new
4640 /// node, and because it doesn't require CSE recalculation for any of
4641 /// the node's users.
4643 SDNode *SelectionDAG::MorphNodeTo(SDNode *N, unsigned Opc,
4644 SDVTList VTs, const SDValue *Ops,
4646 // If an identical node already exists, use it.
4648 if (VTs.VTs[VTs.NumVTs-1] != MVT::Flag) {
4649 FoldingSetNodeID ID;
4650 AddNodeIDNode(ID, Opc, VTs, Ops, NumOps);
4651 if (SDNode *ON = CSEMap.FindNodeOrInsertPos(ID, IP))
4655 if (!RemoveNodeFromCSEMaps(N))
4658 // Start the morphing.
4660 N->ValueList = VTs.VTs;
4661 N->NumValues = VTs.NumVTs;
4663 // Clear the operands list, updating used nodes to remove this from their
4664 // use list. Keep track of any operands that become dead as a result.
4665 SmallPtrSet<SDNode*, 16> DeadNodeSet;
4666 for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ) {
4668 SDNode *Used = Use.getNode();
4670 if (Used->use_empty())
4671 DeadNodeSet.insert(Used);
4674 if (MachineSDNode *MN = dyn_cast<MachineSDNode>(N)) {
4675 // Initialize the memory references information.
4676 MN->setMemRefs(0, 0);
4677 // If NumOps is larger than the # of operands we can have in a
4678 // MachineSDNode, reallocate the operand list.
4679 if (NumOps > MN->NumOperands || !MN->OperandsNeedDelete) {
4680 if (MN->OperandsNeedDelete)
4681 delete[] MN->OperandList;
4682 if (NumOps > array_lengthof(MN->LocalOperands))
4683 // We're creating a final node that will live unmorphed for the
4684 // remainder of the current SelectionDAG iteration, so we can allocate
4685 // the operands directly out of a pool with no recycling metadata.
4686 MN->InitOperands(OperandAllocator.Allocate<SDUse>(NumOps),
4689 MN->InitOperands(MN->LocalOperands, Ops, NumOps);
4690 MN->OperandsNeedDelete = false;
4692 MN->InitOperands(MN->OperandList, Ops, NumOps);
4694 // If NumOps is larger than the # of operands we currently have, reallocate
4695 // the operand list.
4696 if (NumOps > N->NumOperands) {
4697 if (N->OperandsNeedDelete)
4698 delete[] N->OperandList;
4699 N->InitOperands(new SDUse[NumOps], Ops, NumOps);
4700 N->OperandsNeedDelete = true;
4702 N->InitOperands(N->OperandList, Ops, NumOps);
4705 // Delete any nodes that are still dead after adding the uses for the
4707 if (!DeadNodeSet.empty()) {
4708 SmallVector<SDNode *, 16> DeadNodes;
4709 for (SmallPtrSet<SDNode *, 16>::iterator I = DeadNodeSet.begin(),
4710 E = DeadNodeSet.end(); I != E; ++I)
4711 if ((*I)->use_empty())
4712 DeadNodes.push_back(*I);
4713 RemoveDeadNodes(DeadNodes);
4717 CSEMap.InsertNode(N, IP); // Memoize the new node.
4722 /// getMachineNode - These are used for target selectors to create a new node
4723 /// with specified return type(s), MachineInstr opcode, and operands.
4725 /// Note that getMachineNode returns the resultant node. If there is already a
4726 /// node of the specified opcode and operands, it returns that node instead of
4727 /// the current one.
4729 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT) {
4730 SDVTList VTs = getVTList(VT);
4731 return getMachineNode(Opcode, dl, VTs, 0, 0);
4735 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT, SDValue Op1) {
4736 SDVTList VTs = getVTList(VT);
4737 SDValue Ops[] = { Op1 };
4738 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops));
4742 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT,
4743 SDValue Op1, SDValue Op2) {
4744 SDVTList VTs = getVTList(VT);
4745 SDValue Ops[] = { Op1, Op2 };
4746 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops));
4750 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT,
4751 SDValue Op1, SDValue Op2, SDValue Op3) {
4752 SDVTList VTs = getVTList(VT);
4753 SDValue Ops[] = { Op1, Op2, Op3 };
4754 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops));
4758 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT,
4759 const SDValue *Ops, unsigned NumOps) {
4760 SDVTList VTs = getVTList(VT);
4761 return getMachineNode(Opcode, dl, VTs, Ops, NumOps);
4765 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT1, EVT VT2) {
4766 SDVTList VTs = getVTList(VT1, VT2);
4767 return getMachineNode(Opcode, dl, VTs, 0, 0);
4771 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl,
4772 EVT VT1, EVT VT2, SDValue Op1) {
4773 SDVTList VTs = getVTList(VT1, VT2);
4774 SDValue Ops[] = { Op1 };
4775 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops));
4779 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl,
4780 EVT VT1, EVT VT2, SDValue Op1, SDValue Op2) {
4781 SDVTList VTs = getVTList(VT1, VT2);
4782 SDValue Ops[] = { Op1, Op2 };
4783 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops));
4787 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl,
4788 EVT VT1, EVT VT2, SDValue Op1,
4789 SDValue Op2, SDValue Op3) {
4790 SDVTList VTs = getVTList(VT1, VT2);
4791 SDValue Ops[] = { Op1, Op2, Op3 };
4792 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops));
4796 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl,
4798 const SDValue *Ops, unsigned NumOps) {
4799 SDVTList VTs = getVTList(VT1, VT2);
4800 return getMachineNode(Opcode, dl, VTs, Ops, NumOps);
4804 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl,
4805 EVT VT1, EVT VT2, EVT VT3,
4806 SDValue Op1, SDValue Op2) {
4807 SDVTList VTs = getVTList(VT1, VT2, VT3);
4808 SDValue Ops[] = { Op1, Op2 };
4809 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops));
4813 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl,
4814 EVT VT1, EVT VT2, EVT VT3,
4815 SDValue Op1, SDValue Op2, SDValue Op3) {
4816 SDVTList VTs = getVTList(VT1, VT2, VT3);
4817 SDValue Ops[] = { Op1, Op2, Op3 };
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 const SDValue *Ops, unsigned NumOps) {
4825 SDVTList VTs = getVTList(VT1, VT2, VT3);
4826 return getMachineNode(Opcode, dl, VTs, Ops, NumOps);
4830 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT1,
4831 EVT VT2, EVT VT3, EVT VT4,
4832 const SDValue *Ops, unsigned NumOps) {
4833 SDVTList VTs = getVTList(VT1, VT2, VT3, VT4);
4834 return getMachineNode(Opcode, dl, VTs, Ops, NumOps);
4838 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl,
4839 const std::vector<EVT> &ResultTys,
4840 const SDValue *Ops, unsigned NumOps) {
4841 SDVTList VTs = getVTList(&ResultTys[0], ResultTys.size());
4842 return getMachineNode(Opcode, dl, VTs, Ops, NumOps);
4846 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc DL, SDVTList VTs,
4847 const SDValue *Ops, unsigned NumOps) {
4848 bool DoCSE = VTs.VTs[VTs.NumVTs-1] != MVT::Flag;
4853 FoldingSetNodeID ID;
4854 AddNodeIDNode(ID, ~Opcode, VTs, Ops, NumOps);
4856 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
4857 return cast<MachineSDNode>(E);
4860 // Allocate a new MachineSDNode.
4861 N = new (NodeAllocator) MachineSDNode(~Opcode, DL, VTs);
4863 // Initialize the operands list.
4864 if (NumOps > array_lengthof(N->LocalOperands))
4865 // We're creating a final node that will live unmorphed for the
4866 // remainder of the current SelectionDAG iteration, so we can allocate
4867 // the operands directly out of a pool with no recycling metadata.
4868 N->InitOperands(OperandAllocator.Allocate<SDUse>(NumOps),
4871 N->InitOperands(N->LocalOperands, Ops, NumOps);
4872 N->OperandsNeedDelete = false;
4875 CSEMap.InsertNode(N, IP);
4877 AllNodes.push_back(N);
4884 /// getTargetExtractSubreg - A convenience function for creating
4885 /// TargetOpcode::EXTRACT_SUBREG nodes.
4887 SelectionDAG::getTargetExtractSubreg(int SRIdx, DebugLoc DL, EVT VT,
4889 SDValue SRIdxVal = getTargetConstant(SRIdx, MVT::i32);
4890 SDNode *Subreg = getMachineNode(TargetOpcode::EXTRACT_SUBREG, DL,
4891 VT, Operand, SRIdxVal);
4892 return SDValue(Subreg, 0);
4895 /// getTargetInsertSubreg - A convenience function for creating
4896 /// TargetOpcode::INSERT_SUBREG nodes.
4898 SelectionDAG::getTargetInsertSubreg(int SRIdx, DebugLoc DL, EVT VT,
4899 SDValue Operand, SDValue Subreg) {
4900 SDValue SRIdxVal = getTargetConstant(SRIdx, MVT::i32);
4901 SDNode *Result = getMachineNode(TargetOpcode::INSERT_SUBREG, DL,
4902 VT, Operand, Subreg, SRIdxVal);
4903 return SDValue(Result, 0);
4906 /// getNodeIfExists - Get the specified node if it's already available, or
4907 /// else return NULL.
4908 SDNode *SelectionDAG::getNodeIfExists(unsigned Opcode, SDVTList VTList,
4909 const SDValue *Ops, unsigned NumOps) {
4910 if (VTList.VTs[VTList.NumVTs-1] != MVT::Flag) {
4911 FoldingSetNodeID ID;
4912 AddNodeIDNode(ID, Opcode, VTList, Ops, NumOps);
4914 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
4920 /// getDbgValue - Creates a SDDbgValue node.
4923 SelectionDAG::getDbgValue(MDNode *MDPtr, SDNode *N, unsigned R, uint64_t Off,
4924 DebugLoc DL, unsigned O) {
4925 return new (Allocator) SDDbgValue(MDPtr, N, R, Off, DL, O);
4929 SelectionDAG::getDbgValue(MDNode *MDPtr, const Value *C, uint64_t Off,
4930 DebugLoc DL, unsigned O) {
4931 return new (Allocator) SDDbgValue(MDPtr, C, Off, DL, O);
4935 SelectionDAG::getDbgValue(MDNode *MDPtr, unsigned FI, uint64_t Off,
4936 DebugLoc DL, unsigned O) {
4937 return new (Allocator) SDDbgValue(MDPtr, FI, Off, DL, O);
4942 /// RAUWUpdateListener - Helper for ReplaceAllUsesWith - When the node
4943 /// pointed to by a use iterator is deleted, increment the use iterator
4944 /// so that it doesn't dangle.
4946 /// This class also manages a "downlink" DAGUpdateListener, to forward
4947 /// messages to ReplaceAllUsesWith's callers.
4949 class RAUWUpdateListener : public SelectionDAG::DAGUpdateListener {
4950 SelectionDAG::DAGUpdateListener *DownLink;
4951 SDNode::use_iterator &UI;
4952 SDNode::use_iterator &UE;
4954 virtual void NodeDeleted(SDNode *N, SDNode *E) {
4955 // Increment the iterator as needed.
4956 while (UI != UE && N == *UI)
4959 // Then forward the message.
4960 if (DownLink) DownLink->NodeDeleted(N, E);
4963 virtual void NodeUpdated(SDNode *N) {
4964 // Just forward the message.
4965 if (DownLink) DownLink->NodeUpdated(N);
4969 RAUWUpdateListener(SelectionDAG::DAGUpdateListener *dl,
4970 SDNode::use_iterator &ui,
4971 SDNode::use_iterator &ue)
4972 : DownLink(dl), UI(ui), UE(ue) {}
4977 /// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead.
4978 /// This can cause recursive merging of nodes in the DAG.
4980 /// This version assumes From has a single result value.
4982 void SelectionDAG::ReplaceAllUsesWith(SDValue FromN, SDValue To,
4983 DAGUpdateListener *UpdateListener) {
4984 SDNode *From = FromN.getNode();
4985 assert(From->getNumValues() == 1 && FromN.getResNo() == 0 &&
4986 "Cannot replace with this method!");
4987 assert(From != To.getNode() && "Cannot replace uses of with self");
4989 // Iterate over all the existing uses of From. New uses will be added
4990 // to the beginning of the use list, which we avoid visiting.
4991 // This specifically avoids visiting uses of From that arise while the
4992 // replacement is happening, because any such uses would be the result
4993 // of CSE: If an existing node looks like From after one of its operands
4994 // is replaced by To, we don't want to replace of all its users with To
4995 // too. See PR3018 for more info.
4996 SDNode::use_iterator UI = From->use_begin(), UE = From->use_end();
4997 RAUWUpdateListener Listener(UpdateListener, UI, UE);
5001 // This node is about to morph, remove its old self from the CSE maps.
5002 RemoveNodeFromCSEMaps(User);
5004 // A user can appear in a use list multiple times, and when this
5005 // happens the uses are usually next to each other in the list.
5006 // To help reduce the number of CSE recomputations, process all
5007 // the uses of this user that we can find this way.
5009 SDUse &Use = UI.getUse();
5012 } while (UI != UE && *UI == User);
5014 // Now that we have modified User, add it back to the CSE maps. If it
5015 // already exists there, recursively merge the results together.
5016 AddModifiedNodeToCSEMaps(User, &Listener);
5020 /// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead.
5021 /// This can cause recursive merging of nodes in the DAG.
5023 /// This version assumes that for each value of From, there is a
5024 /// corresponding value in To in the same position with the same type.
5026 void SelectionDAG::ReplaceAllUsesWith(SDNode *From, SDNode *To,
5027 DAGUpdateListener *UpdateListener) {
5029 for (unsigned i = 0, e = From->getNumValues(); i != e; ++i)
5030 assert((!From->hasAnyUseOfValue(i) ||
5031 From->getValueType(i) == To->getValueType(i)) &&
5032 "Cannot use this version of ReplaceAllUsesWith!");
5035 // Handle the trivial case.
5039 // Iterate over just the existing users of From. See the comments in
5040 // the ReplaceAllUsesWith above.
5041 SDNode::use_iterator UI = From->use_begin(), UE = From->use_end();
5042 RAUWUpdateListener Listener(UpdateListener, UI, UE);
5046 // This node is about to morph, remove its old self from the CSE maps.
5047 RemoveNodeFromCSEMaps(User);
5049 // A user can appear in a use list multiple times, and when this
5050 // happens the uses are usually next to each other in the list.
5051 // To help reduce the number of CSE recomputations, process all
5052 // the uses of this user that we can find this way.
5054 SDUse &Use = UI.getUse();
5057 } while (UI != UE && *UI == User);
5059 // Now that we have modified User, add it back to the CSE maps. If it
5060 // already exists there, recursively merge the results together.
5061 AddModifiedNodeToCSEMaps(User, &Listener);
5065 /// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead.
5066 /// This can cause recursive merging of nodes in the DAG.
5068 /// This version can replace From with any result values. To must match the
5069 /// number and types of values returned by From.
5070 void SelectionDAG::ReplaceAllUsesWith(SDNode *From,
5072 DAGUpdateListener *UpdateListener) {
5073 if (From->getNumValues() == 1) // Handle the simple case efficiently.
5074 return ReplaceAllUsesWith(SDValue(From, 0), To[0], UpdateListener);
5076 // Iterate over just the existing users of From. See the comments in
5077 // the ReplaceAllUsesWith above.
5078 SDNode::use_iterator UI = From->use_begin(), UE = From->use_end();
5079 RAUWUpdateListener Listener(UpdateListener, UI, UE);
5083 // This node is about to morph, remove its old self from the CSE maps.
5084 RemoveNodeFromCSEMaps(User);
5086 // A user can appear in a use list multiple times, and when this
5087 // happens the uses are usually next to each other in the list.
5088 // To help reduce the number of CSE recomputations, process all
5089 // the uses of this user that we can find this way.
5091 SDUse &Use = UI.getUse();
5092 const SDValue &ToOp = To[Use.getResNo()];
5095 } while (UI != UE && *UI == User);
5097 // Now that we have modified User, add it back to the CSE maps. If it
5098 // already exists there, recursively merge the results together.
5099 AddModifiedNodeToCSEMaps(User, &Listener);
5103 /// ReplaceAllUsesOfValueWith - Replace any uses of From with To, leaving
5104 /// uses of other values produced by From.getNode() alone. The Deleted
5105 /// vector is handled the same way as for ReplaceAllUsesWith.
5106 void SelectionDAG::ReplaceAllUsesOfValueWith(SDValue From, SDValue To,
5107 DAGUpdateListener *UpdateListener){
5108 // Handle the really simple, really trivial case efficiently.
5109 if (From == To) return;
5111 // Handle the simple, trivial, case efficiently.
5112 if (From.getNode()->getNumValues() == 1) {
5113 ReplaceAllUsesWith(From, To, UpdateListener);
5117 // Iterate over just the existing users of From. See the comments in
5118 // the ReplaceAllUsesWith above.
5119 SDNode::use_iterator UI = From.getNode()->use_begin(),
5120 UE = From.getNode()->use_end();
5121 RAUWUpdateListener Listener(UpdateListener, UI, UE);
5124 bool UserRemovedFromCSEMaps = false;
5126 // A user can appear in a use list multiple times, and when this
5127 // happens the uses are usually next to each other in the list.
5128 // To help reduce the number of CSE recomputations, process all
5129 // the uses of this user that we can find this way.
5131 SDUse &Use = UI.getUse();
5133 // Skip uses of different values from the same node.
5134 if (Use.getResNo() != From.getResNo()) {
5139 // If this node hasn't been modified yet, it's still in the CSE maps,
5140 // so remove its old self from the CSE maps.
5141 if (!UserRemovedFromCSEMaps) {
5142 RemoveNodeFromCSEMaps(User);
5143 UserRemovedFromCSEMaps = true;
5148 } while (UI != UE && *UI == User);
5150 // We are iterating over all uses of the From node, so if a use
5151 // doesn't use the specific value, no changes are made.
5152 if (!UserRemovedFromCSEMaps)
5155 // Now that we have modified User, add it back to the CSE maps. If it
5156 // already exists there, recursively merge the results together.
5157 AddModifiedNodeToCSEMaps(User, &Listener);
5162 /// UseMemo - This class is used by SelectionDAG::ReplaceAllUsesOfValuesWith
5163 /// to record information about a use.
5170 /// operator< - Sort Memos by User.
5171 bool operator<(const UseMemo &L, const UseMemo &R) {
5172 return (intptr_t)L.User < (intptr_t)R.User;
5176 /// ReplaceAllUsesOfValuesWith - Replace any uses of From with To, leaving
5177 /// uses of other values produced by From.getNode() alone. The same value
5178 /// may appear in both the From and To list. The Deleted vector is
5179 /// handled the same way as for ReplaceAllUsesWith.
5180 void SelectionDAG::ReplaceAllUsesOfValuesWith(const SDValue *From,
5183 DAGUpdateListener *UpdateListener){
5184 // Handle the simple, trivial case efficiently.
5186 return ReplaceAllUsesOfValueWith(*From, *To, UpdateListener);
5188 // Read up all the uses and make records of them. This helps
5189 // processing new uses that are introduced during the
5190 // replacement process.
5191 SmallVector<UseMemo, 4> Uses;
5192 for (unsigned i = 0; i != Num; ++i) {
5193 unsigned FromResNo = From[i].getResNo();
5194 SDNode *FromNode = From[i].getNode();
5195 for (SDNode::use_iterator UI = FromNode->use_begin(),
5196 E = FromNode->use_end(); UI != E; ++UI) {
5197 SDUse &Use = UI.getUse();
5198 if (Use.getResNo() == FromResNo) {
5199 UseMemo Memo = { *UI, i, &Use };
5200 Uses.push_back(Memo);
5205 // Sort the uses, so that all the uses from a given User are together.
5206 std::sort(Uses.begin(), Uses.end());
5208 for (unsigned UseIndex = 0, UseIndexEnd = Uses.size();
5209 UseIndex != UseIndexEnd; ) {
5210 // We know that this user uses some value of From. If it is the right
5211 // value, update it.
5212 SDNode *User = Uses[UseIndex].User;
5214 // This node is about to morph, remove its old self from the CSE maps.
5215 RemoveNodeFromCSEMaps(User);
5217 // The Uses array is sorted, so all the uses for a given User
5218 // are next to each other in the list.
5219 // To help reduce the number of CSE recomputations, process all
5220 // the uses of this user that we can find this way.
5222 unsigned i = Uses[UseIndex].Index;
5223 SDUse &Use = *Uses[UseIndex].Use;
5227 } while (UseIndex != UseIndexEnd && Uses[UseIndex].User == User);
5229 // Now that we have modified User, add it back to the CSE maps. If it
5230 // already exists there, recursively merge the results together.
5231 AddModifiedNodeToCSEMaps(User, UpdateListener);
5235 /// AssignTopologicalOrder - Assign a unique node id for each node in the DAG
5236 /// based on their topological order. It returns the maximum id and a vector
5237 /// of the SDNodes* in assigned order by reference.
5238 unsigned SelectionDAG::AssignTopologicalOrder() {
5240 unsigned DAGSize = 0;
5242 // SortedPos tracks the progress of the algorithm. Nodes before it are
5243 // sorted, nodes after it are unsorted. When the algorithm completes
5244 // it is at the end of the list.
5245 allnodes_iterator SortedPos = allnodes_begin();
5247 // Visit all the nodes. Move nodes with no operands to the front of
5248 // the list immediately. Annotate nodes that do have operands with their
5249 // operand count. Before we do this, the Node Id fields of the nodes
5250 // may contain arbitrary values. After, the Node Id fields for nodes
5251 // before SortedPos will contain the topological sort index, and the
5252 // Node Id fields for nodes At SortedPos and after will contain the
5253 // count of outstanding operands.
5254 for (allnodes_iterator I = allnodes_begin(),E = allnodes_end(); I != E; ) {
5257 unsigned Degree = N->getNumOperands();
5259 // A node with no uses, add it to the result array immediately.
5260 N->setNodeId(DAGSize++);
5261 allnodes_iterator Q = N;
5263 SortedPos = AllNodes.insert(SortedPos, AllNodes.remove(Q));
5264 assert(SortedPos != AllNodes.end() && "Overran node list");
5267 // Temporarily use the Node Id as scratch space for the degree count.
5268 N->setNodeId(Degree);
5272 // Visit all the nodes. As we iterate, moves nodes into sorted order,
5273 // such that by the time the end is reached all nodes will be sorted.
5274 for (allnodes_iterator I = allnodes_begin(),E = allnodes_end(); I != E; ++I) {
5277 // N is in sorted position, so all its uses have one less operand
5278 // that needs to be sorted.
5279 for (SDNode::use_iterator UI = N->use_begin(), UE = N->use_end();
5282 unsigned Degree = P->getNodeId();
5283 assert(Degree != 0 && "Invalid node degree");
5286 // All of P's operands are sorted, so P may sorted now.
5287 P->setNodeId(DAGSize++);
5289 SortedPos = AllNodes.insert(SortedPos, AllNodes.remove(P));
5290 assert(SortedPos != AllNodes.end() && "Overran node list");
5293 // Update P's outstanding operand count.
5294 P->setNodeId(Degree);
5297 if (I == SortedPos) {
5300 dbgs() << "Overran sorted position:\n";
5303 llvm_unreachable(0);
5307 assert(SortedPos == AllNodes.end() &&
5308 "Topological sort incomplete!");
5309 assert(AllNodes.front().getOpcode() == ISD::EntryToken &&
5310 "First node in topological sort is not the entry token!");
5311 assert(AllNodes.front().getNodeId() == 0 &&
5312 "First node in topological sort has non-zero id!");
5313 assert(AllNodes.front().getNumOperands() == 0 &&
5314 "First node in topological sort has operands!");
5315 assert(AllNodes.back().getNodeId() == (int)DAGSize-1 &&
5316 "Last node in topologic sort has unexpected id!");
5317 assert(AllNodes.back().use_empty() &&
5318 "Last node in topologic sort has users!");
5319 assert(DAGSize == allnodes_size() && "Node count mismatch!");
5323 /// AssignOrdering - Assign an order to the SDNode.
5324 void SelectionDAG::AssignOrdering(const SDNode *SD, unsigned Order) {
5325 assert(SD && "Trying to assign an order to a null node!");
5326 Ordering->add(SD, Order);
5329 /// GetOrdering - Get the order for the SDNode.
5330 unsigned SelectionDAG::GetOrdering(const SDNode *SD) const {
5331 assert(SD && "Trying to get the order of a null node!");
5332 return Ordering->getOrder(SD);
5335 /// AddDbgValue - Add a dbg_value SDNode. If SD is non-null that means the
5336 /// value is produced by SD.
5337 void SelectionDAG::AddDbgValue(SDDbgValue *DB, SDNode *SD, bool isParameter) {
5338 DbgInfo->add(DB, SD, isParameter);
5340 SD->setHasDebugValue(true);
5343 //===----------------------------------------------------------------------===//
5345 //===----------------------------------------------------------------------===//
5347 HandleSDNode::~HandleSDNode() {
5351 GlobalAddressSDNode::GlobalAddressSDNode(unsigned Opc, DebugLoc DL,
5352 const GlobalValue *GA,
5353 EVT VT, int64_t o, unsigned char TF)
5354 : SDNode(Opc, DL, getSDVTList(VT)), Offset(o), TargetFlags(TF) {
5358 MemSDNode::MemSDNode(unsigned Opc, DebugLoc dl, SDVTList VTs, EVT memvt,
5359 MachineMemOperand *mmo)
5360 : SDNode(Opc, dl, VTs), MemoryVT(memvt), MMO(mmo) {
5361 SubclassData = encodeMemSDNodeFlags(0, ISD::UNINDEXED, MMO->isVolatile(),
5362 MMO->isNonTemporal());
5363 assert(isVolatile() == MMO->isVolatile() && "Volatile encoding error!");
5364 assert(isNonTemporal() == MMO->isNonTemporal() &&
5365 "Non-temporal encoding error!");
5366 assert(memvt.getStoreSize() == MMO->getSize() && "Size mismatch!");
5369 MemSDNode::MemSDNode(unsigned Opc, DebugLoc dl, SDVTList VTs,
5370 const SDValue *Ops, unsigned NumOps, EVT memvt,
5371 MachineMemOperand *mmo)
5372 : SDNode(Opc, dl, VTs, Ops, NumOps),
5373 MemoryVT(memvt), MMO(mmo) {
5374 SubclassData = encodeMemSDNodeFlags(0, ISD::UNINDEXED, MMO->isVolatile(),
5375 MMO->isNonTemporal());
5376 assert(isVolatile() == MMO->isVolatile() && "Volatile encoding error!");
5377 assert(memvt.getStoreSize() == MMO->getSize() && "Size mismatch!");
5380 /// Profile - Gather unique data for the node.
5382 void SDNode::Profile(FoldingSetNodeID &ID) const {
5383 AddNodeIDNode(ID, this);
5388 std::vector<EVT> VTs;
5391 VTs.reserve(MVT::LAST_VALUETYPE);
5392 for (unsigned i = 0; i < MVT::LAST_VALUETYPE; ++i)
5393 VTs.push_back(MVT((MVT::SimpleValueType)i));
5398 static ManagedStatic<std::set<EVT, EVT::compareRawBits> > EVTs;
5399 static ManagedStatic<EVTArray> SimpleVTArray;
5400 static ManagedStatic<sys::SmartMutex<true> > VTMutex;
5402 /// getValueTypeList - Return a pointer to the specified value type.
5404 const EVT *SDNode::getValueTypeList(EVT VT) {
5405 if (VT.isExtended()) {
5406 sys::SmartScopedLock<true> Lock(*VTMutex);
5407 return &(*EVTs->insert(VT).first);
5409 assert(VT.getSimpleVT().SimpleTy < MVT::LAST_VALUETYPE &&
5410 "Value type out of range!");
5411 return &SimpleVTArray->VTs[VT.getSimpleVT().SimpleTy];
5415 /// hasNUsesOfValue - Return true if there are exactly NUSES uses of the
5416 /// indicated value. This method ignores uses of other values defined by this
5418 bool SDNode::hasNUsesOfValue(unsigned NUses, unsigned Value) const {
5419 assert(Value < getNumValues() && "Bad value!");
5421 // TODO: Only iterate over uses of a given value of the node
5422 for (SDNode::use_iterator UI = use_begin(), E = use_end(); UI != E; ++UI) {
5423 if (UI.getUse().getResNo() == Value) {
5430 // Found exactly the right number of uses?
5435 /// hasAnyUseOfValue - Return true if there are any use of the indicated
5436 /// value. This method ignores uses of other values defined by this operation.
5437 bool SDNode::hasAnyUseOfValue(unsigned Value) const {
5438 assert(Value < getNumValues() && "Bad value!");
5440 for (SDNode::use_iterator UI = use_begin(), E = use_end(); UI != E; ++UI)
5441 if (UI.getUse().getResNo() == Value)
5448 /// isOnlyUserOf - Return true if this node is the only use of N.
5450 bool SDNode::isOnlyUserOf(SDNode *N) const {
5452 for (SDNode::use_iterator I = N->use_begin(), E = N->use_end(); I != E; ++I) {
5463 /// isOperand - Return true if this node is an operand of N.
5465 bool SDValue::isOperandOf(SDNode *N) const {
5466 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i)
5467 if (*this == N->getOperand(i))
5472 bool SDNode::isOperandOf(SDNode *N) const {
5473 for (unsigned i = 0, e = N->NumOperands; i != e; ++i)
5474 if (this == N->OperandList[i].getNode())
5479 /// reachesChainWithoutSideEffects - Return true if this operand (which must
5480 /// be a chain) reaches the specified operand without crossing any
5481 /// side-effecting instructions. In practice, this looks through token
5482 /// factors and non-volatile loads. In order to remain efficient, this only
5483 /// looks a couple of nodes in, it does not do an exhaustive search.
5484 bool SDValue::reachesChainWithoutSideEffects(SDValue Dest,
5485 unsigned Depth) const {
5486 if (*this == Dest) return true;
5488 // Don't search too deeply, we just want to be able to see through
5489 // TokenFactor's etc.
5490 if (Depth == 0) return false;
5492 // If this is a token factor, all inputs to the TF happen in parallel. If any
5493 // of the operands of the TF reach dest, then we can do the xform.
5494 if (getOpcode() == ISD::TokenFactor) {
5495 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
5496 if (getOperand(i).reachesChainWithoutSideEffects(Dest, Depth-1))
5501 // Loads don't have side effects, look through them.
5502 if (LoadSDNode *Ld = dyn_cast<LoadSDNode>(*this)) {
5503 if (!Ld->isVolatile())
5504 return Ld->getChain().reachesChainWithoutSideEffects(Dest, Depth-1);
5509 /// isPredecessorOf - Return true if this node is a predecessor of N. This node
5510 /// is either an operand of N or it can be reached by traversing up the operands.
5511 /// NOTE: this is an expensive method. Use it carefully.
5512 bool SDNode::isPredecessorOf(SDNode *N) const {
5513 SmallPtrSet<SDNode *, 32> Visited;
5514 SmallVector<SDNode *, 16> Worklist;
5515 Worklist.push_back(N);
5518 N = Worklist.pop_back_val();
5519 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
5520 SDNode *Op = N->getOperand(i).getNode();
5523 if (Visited.insert(Op))
5524 Worklist.push_back(Op);
5526 } while (!Worklist.empty());
5531 uint64_t SDNode::getConstantOperandVal(unsigned Num) const {
5532 assert(Num < NumOperands && "Invalid child # of SDNode!");
5533 return cast<ConstantSDNode>(OperandList[Num])->getZExtValue();
5536 std::string SDNode::getOperationName(const SelectionDAG *G) const {
5537 switch (getOpcode()) {
5539 if (getOpcode() < ISD::BUILTIN_OP_END)
5540 return "<<Unknown DAG Node>>";
5541 if (isMachineOpcode()) {
5543 if (const TargetInstrInfo *TII = G->getTarget().getInstrInfo())
5544 if (getMachineOpcode() < TII->getNumOpcodes())
5545 return TII->get(getMachineOpcode()).getName();
5546 return "<<Unknown Machine Node #" + utostr(getOpcode()) + ">>";
5549 const TargetLowering &TLI = G->getTargetLoweringInfo();
5550 const char *Name = TLI.getTargetNodeName(getOpcode());
5551 if (Name) return Name;
5552 return "<<Unknown Target Node #" + utostr(getOpcode()) + ">>";
5554 return "<<Unknown Node #" + utostr(getOpcode()) + ">>";
5557 case ISD::DELETED_NODE:
5558 return "<<Deleted Node!>>";
5560 case ISD::PREFETCH: return "Prefetch";
5561 case ISD::MEMBARRIER: return "MemBarrier";
5562 case ISD::ATOMIC_CMP_SWAP: return "AtomicCmpSwap";
5563 case ISD::ATOMIC_SWAP: return "AtomicSwap";
5564 case ISD::ATOMIC_LOAD_ADD: return "AtomicLoadAdd";
5565 case ISD::ATOMIC_LOAD_SUB: return "AtomicLoadSub";
5566 case ISD::ATOMIC_LOAD_AND: return "AtomicLoadAnd";
5567 case ISD::ATOMIC_LOAD_OR: return "AtomicLoadOr";
5568 case ISD::ATOMIC_LOAD_XOR: return "AtomicLoadXor";
5569 case ISD::ATOMIC_LOAD_NAND: return "AtomicLoadNand";
5570 case ISD::ATOMIC_LOAD_MIN: return "AtomicLoadMin";
5571 case ISD::ATOMIC_LOAD_MAX: return "AtomicLoadMax";
5572 case ISD::ATOMIC_LOAD_UMIN: return "AtomicLoadUMin";
5573 case ISD::ATOMIC_LOAD_UMAX: return "AtomicLoadUMax";
5574 case ISD::PCMARKER: return "PCMarker";
5575 case ISD::READCYCLECOUNTER: return "ReadCycleCounter";
5576 case ISD::SRCVALUE: return "SrcValue";
5577 case ISD::MDNODE_SDNODE: return "MDNode";
5578 case ISD::EntryToken: return "EntryToken";
5579 case ISD::TokenFactor: return "TokenFactor";
5580 case ISD::AssertSext: return "AssertSext";
5581 case ISD::AssertZext: return "AssertZext";
5583 case ISD::BasicBlock: return "BasicBlock";
5584 case ISD::VALUETYPE: return "ValueType";
5585 case ISD::Register: return "Register";
5587 case ISD::Constant: return "Constant";
5588 case ISD::ConstantFP: return "ConstantFP";
5589 case ISD::GlobalAddress: return "GlobalAddress";
5590 case ISD::GlobalTLSAddress: return "GlobalTLSAddress";
5591 case ISD::FrameIndex: return "FrameIndex";
5592 case ISD::JumpTable: return "JumpTable";
5593 case ISD::GLOBAL_OFFSET_TABLE: return "GLOBAL_OFFSET_TABLE";
5594 case ISD::RETURNADDR: return "RETURNADDR";
5595 case ISD::FRAMEADDR: return "FRAMEADDR";
5596 case ISD::FRAME_TO_ARGS_OFFSET: return "FRAME_TO_ARGS_OFFSET";
5597 case ISD::EXCEPTIONADDR: return "EXCEPTIONADDR";
5598 case ISD::LSDAADDR: return "LSDAADDR";
5599 case ISD::EHSELECTION: return "EHSELECTION";
5600 case ISD::EH_RETURN: return "EH_RETURN";
5601 case ISD::EH_SJLJ_SETJMP: return "EH_SJLJ_SETJMP";
5602 case ISD::EH_SJLJ_LONGJMP: return "EH_SJLJ_LONGJMP";
5603 case ISD::ConstantPool: return "ConstantPool";
5604 case ISD::ExternalSymbol: return "ExternalSymbol";
5605 case ISD::BlockAddress: return "BlockAddress";
5606 case ISD::INTRINSIC_WO_CHAIN:
5607 case ISD::INTRINSIC_VOID:
5608 case ISD::INTRINSIC_W_CHAIN: {
5609 unsigned OpNo = getOpcode() == ISD::INTRINSIC_WO_CHAIN ? 0 : 1;
5610 unsigned IID = cast<ConstantSDNode>(getOperand(OpNo))->getZExtValue();
5611 if (IID < Intrinsic::num_intrinsics)
5612 return Intrinsic::getName((Intrinsic::ID)IID);
5613 else if (const TargetIntrinsicInfo *TII = G->getTarget().getIntrinsicInfo())
5614 return TII->getName(IID);
5615 llvm_unreachable("Invalid intrinsic ID");
5618 case ISD::BUILD_VECTOR: return "BUILD_VECTOR";
5619 case ISD::TargetConstant: return "TargetConstant";
5620 case ISD::TargetConstantFP:return "TargetConstantFP";
5621 case ISD::TargetGlobalAddress: return "TargetGlobalAddress";
5622 case ISD::TargetGlobalTLSAddress: return "TargetGlobalTLSAddress";
5623 case ISD::TargetFrameIndex: return "TargetFrameIndex";
5624 case ISD::TargetJumpTable: return "TargetJumpTable";
5625 case ISD::TargetConstantPool: return "TargetConstantPool";
5626 case ISD::TargetExternalSymbol: return "TargetExternalSymbol";
5627 case ISD::TargetBlockAddress: return "TargetBlockAddress";
5629 case ISD::CopyToReg: return "CopyToReg";
5630 case ISD::CopyFromReg: return "CopyFromReg";
5631 case ISD::UNDEF: return "undef";
5632 case ISD::MERGE_VALUES: return "merge_values";
5633 case ISD::INLINEASM: return "inlineasm";
5634 case ISD::EH_LABEL: return "eh_label";
5635 case ISD::HANDLENODE: return "handlenode";
5638 case ISD::FABS: return "fabs";
5639 case ISD::FNEG: return "fneg";
5640 case ISD::FSQRT: return "fsqrt";
5641 case ISD::FSIN: return "fsin";
5642 case ISD::FCOS: return "fcos";
5643 case ISD::FTRUNC: return "ftrunc";
5644 case ISD::FFLOOR: return "ffloor";
5645 case ISD::FCEIL: return "fceil";
5646 case ISD::FRINT: return "frint";
5647 case ISD::FNEARBYINT: return "fnearbyint";
5648 case ISD::FEXP: return "fexp";
5649 case ISD::FEXP2: return "fexp2";
5650 case ISD::FLOG: return "flog";
5651 case ISD::FLOG2: return "flog2";
5652 case ISD::FLOG10: return "flog10";
5655 case ISD::ADD: return "add";
5656 case ISD::SUB: return "sub";
5657 case ISD::MUL: return "mul";
5658 case ISD::MULHU: return "mulhu";
5659 case ISD::MULHS: return "mulhs";
5660 case ISD::SDIV: return "sdiv";
5661 case ISD::UDIV: return "udiv";
5662 case ISD::SREM: return "srem";
5663 case ISD::UREM: return "urem";
5664 case ISD::SMUL_LOHI: return "smul_lohi";
5665 case ISD::UMUL_LOHI: return "umul_lohi";
5666 case ISD::SDIVREM: return "sdivrem";
5667 case ISD::UDIVREM: return "udivrem";
5668 case ISD::AND: return "and";
5669 case ISD::OR: return "or";
5670 case ISD::XOR: return "xor";
5671 case ISD::SHL: return "shl";
5672 case ISD::SRA: return "sra";
5673 case ISD::SRL: return "srl";
5674 case ISD::ROTL: return "rotl";
5675 case ISD::ROTR: return "rotr";
5676 case ISD::FADD: return "fadd";
5677 case ISD::FSUB: return "fsub";
5678 case ISD::FMUL: return "fmul";
5679 case ISD::FDIV: return "fdiv";
5680 case ISD::FREM: return "frem";
5681 case ISD::FCOPYSIGN: return "fcopysign";
5682 case ISD::FGETSIGN: return "fgetsign";
5683 case ISD::FPOW: return "fpow";
5685 case ISD::FPOWI: return "fpowi";
5686 case ISD::SETCC: return "setcc";
5687 case ISD::VSETCC: return "vsetcc";
5688 case ISD::SELECT: return "select";
5689 case ISD::SELECT_CC: return "select_cc";
5690 case ISD::INSERT_VECTOR_ELT: return "insert_vector_elt";
5691 case ISD::EXTRACT_VECTOR_ELT: return "extract_vector_elt";
5692 case ISD::CONCAT_VECTORS: return "concat_vectors";
5693 case ISD::EXTRACT_SUBVECTOR: return "extract_subvector";
5694 case ISD::SCALAR_TO_VECTOR: return "scalar_to_vector";
5695 case ISD::VECTOR_SHUFFLE: return "vector_shuffle";
5696 case ISD::CARRY_FALSE: return "carry_false";
5697 case ISD::ADDC: return "addc";
5698 case ISD::ADDE: return "adde";
5699 case ISD::SADDO: return "saddo";
5700 case ISD::UADDO: return "uaddo";
5701 case ISD::SSUBO: return "ssubo";
5702 case ISD::USUBO: return "usubo";
5703 case ISD::SMULO: return "smulo";
5704 case ISD::UMULO: return "umulo";
5705 case ISD::SUBC: return "subc";
5706 case ISD::SUBE: return "sube";
5707 case ISD::SHL_PARTS: return "shl_parts";
5708 case ISD::SRA_PARTS: return "sra_parts";
5709 case ISD::SRL_PARTS: return "srl_parts";
5711 // Conversion operators.
5712 case ISD::SIGN_EXTEND: return "sign_extend";
5713 case ISD::ZERO_EXTEND: return "zero_extend";
5714 case ISD::ANY_EXTEND: return "any_extend";
5715 case ISD::SIGN_EXTEND_INREG: return "sign_extend_inreg";
5716 case ISD::TRUNCATE: return "truncate";
5717 case ISD::FP_ROUND: return "fp_round";
5718 case ISD::FLT_ROUNDS_: return "flt_rounds";
5719 case ISD::FP_ROUND_INREG: return "fp_round_inreg";
5720 case ISD::FP_EXTEND: return "fp_extend";
5722 case ISD::SINT_TO_FP: return "sint_to_fp";
5723 case ISD::UINT_TO_FP: return "uint_to_fp";
5724 case ISD::FP_TO_SINT: return "fp_to_sint";
5725 case ISD::FP_TO_UINT: return "fp_to_uint";
5726 case ISD::BIT_CONVERT: return "bit_convert";
5727 case ISD::FP16_TO_FP32: return "fp16_to_fp32";
5728 case ISD::FP32_TO_FP16: return "fp32_to_fp16";
5730 case ISD::CONVERT_RNDSAT: {
5731 switch (cast<CvtRndSatSDNode>(this)->getCvtCode()) {
5732 default: llvm_unreachable("Unknown cvt code!");
5733 case ISD::CVT_FF: return "cvt_ff";
5734 case ISD::CVT_FS: return "cvt_fs";
5735 case ISD::CVT_FU: return "cvt_fu";
5736 case ISD::CVT_SF: return "cvt_sf";
5737 case ISD::CVT_UF: return "cvt_uf";
5738 case ISD::CVT_SS: return "cvt_ss";
5739 case ISD::CVT_SU: return "cvt_su";
5740 case ISD::CVT_US: return "cvt_us";
5741 case ISD::CVT_UU: return "cvt_uu";
5745 // Control flow instructions
5746 case ISD::BR: return "br";
5747 case ISD::BRIND: return "brind";
5748 case ISD::BR_JT: return "br_jt";
5749 case ISD::BRCOND: return "brcond";
5750 case ISD::BR_CC: return "br_cc";
5751 case ISD::CALLSEQ_START: return "callseq_start";
5752 case ISD::CALLSEQ_END: return "callseq_end";
5755 case ISD::LOAD: return "load";
5756 case ISD::STORE: return "store";
5757 case ISD::VAARG: return "vaarg";
5758 case ISD::VACOPY: return "vacopy";
5759 case ISD::VAEND: return "vaend";
5760 case ISD::VASTART: return "vastart";
5761 case ISD::DYNAMIC_STACKALLOC: return "dynamic_stackalloc";
5762 case ISD::EXTRACT_ELEMENT: return "extract_element";
5763 case ISD::BUILD_PAIR: return "build_pair";
5764 case ISD::STACKSAVE: return "stacksave";
5765 case ISD::STACKRESTORE: return "stackrestore";
5766 case ISD::TRAP: return "trap";
5769 case ISD::BSWAP: return "bswap";
5770 case ISD::CTPOP: return "ctpop";
5771 case ISD::CTTZ: return "cttz";
5772 case ISD::CTLZ: return "ctlz";
5775 case ISD::TRAMPOLINE: return "trampoline";
5778 switch (cast<CondCodeSDNode>(this)->get()) {
5779 default: llvm_unreachable("Unknown setcc condition!");
5780 case ISD::SETOEQ: return "setoeq";
5781 case ISD::SETOGT: return "setogt";
5782 case ISD::SETOGE: return "setoge";
5783 case ISD::SETOLT: return "setolt";
5784 case ISD::SETOLE: return "setole";
5785 case ISD::SETONE: return "setone";
5787 case ISD::SETO: return "seto";
5788 case ISD::SETUO: return "setuo";
5789 case ISD::SETUEQ: return "setue";
5790 case ISD::SETUGT: return "setugt";
5791 case ISD::SETUGE: return "setuge";
5792 case ISD::SETULT: return "setult";
5793 case ISD::SETULE: return "setule";
5794 case ISD::SETUNE: return "setune";
5796 case ISD::SETEQ: return "seteq";
5797 case ISD::SETGT: return "setgt";
5798 case ISD::SETGE: return "setge";
5799 case ISD::SETLT: return "setlt";
5800 case ISD::SETLE: return "setle";
5801 case ISD::SETNE: return "setne";
5806 const char *SDNode::getIndexedModeName(ISD::MemIndexedMode AM) {
5815 return "<post-inc>";
5817 return "<post-dec>";
5821 std::string ISD::ArgFlagsTy::getArgFlagsString() {
5822 std::string S = "< ";
5836 if (getByValAlign())
5837 S += "byval-align:" + utostr(getByValAlign()) + " ";
5839 S += "orig-align:" + utostr(getOrigAlign()) + " ";
5841 S += "byval-size:" + utostr(getByValSize()) + " ";
5845 void SDNode::dump() const { dump(0); }
5846 void SDNode::dump(const SelectionDAG *G) const {
5851 void SDNode::print_types(raw_ostream &OS, const SelectionDAG *G) const {
5852 OS << (void*)this << ": ";
5854 for (unsigned i = 0, e = getNumValues(); i != e; ++i) {
5856 if (getValueType(i) == MVT::Other)
5859 OS << getValueType(i).getEVTString();
5861 OS << " = " << getOperationName(G);
5864 void SDNode::print_details(raw_ostream &OS, const SelectionDAG *G) const {
5865 if (const MachineSDNode *MN = dyn_cast<MachineSDNode>(this)) {
5866 if (!MN->memoperands_empty()) {
5869 for (MachineSDNode::mmo_iterator i = MN->memoperands_begin(),
5870 e = MN->memoperands_end(); i != e; ++i) {
5872 if (llvm::next(i) != e)
5877 } else if (const ShuffleVectorSDNode *SVN =
5878 dyn_cast<ShuffleVectorSDNode>(this)) {
5880 for (unsigned i = 0, e = ValueList[0].getVectorNumElements(); i != e; ++i) {
5881 int Idx = SVN->getMaskElt(i);
5889 } else if (const ConstantSDNode *CSDN = dyn_cast<ConstantSDNode>(this)) {
5890 OS << '<' << CSDN->getAPIntValue() << '>';
5891 } else if (const ConstantFPSDNode *CSDN = dyn_cast<ConstantFPSDNode>(this)) {
5892 if (&CSDN->getValueAPF().getSemantics()==&APFloat::IEEEsingle)
5893 OS << '<' << CSDN->getValueAPF().convertToFloat() << '>';
5894 else if (&CSDN->getValueAPF().getSemantics()==&APFloat::IEEEdouble)
5895 OS << '<' << CSDN->getValueAPF().convertToDouble() << '>';
5898 CSDN->getValueAPF().bitcastToAPInt().dump();
5901 } else if (const GlobalAddressSDNode *GADN =
5902 dyn_cast<GlobalAddressSDNode>(this)) {
5903 int64_t offset = GADN->getOffset();
5905 WriteAsOperand(OS, GADN->getGlobal());
5908 OS << " + " << offset;
5910 OS << " " << offset;
5911 if (unsigned int TF = GADN->getTargetFlags())
5912 OS << " [TF=" << TF << ']';
5913 } else if (const FrameIndexSDNode *FIDN = dyn_cast<FrameIndexSDNode>(this)) {
5914 OS << "<" << FIDN->getIndex() << ">";
5915 } else if (const JumpTableSDNode *JTDN = dyn_cast<JumpTableSDNode>(this)) {
5916 OS << "<" << JTDN->getIndex() << ">";
5917 if (unsigned int TF = JTDN->getTargetFlags())
5918 OS << " [TF=" << TF << ']';
5919 } else if (const ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(this)){
5920 int offset = CP->getOffset();
5921 if (CP->isMachineConstantPoolEntry())
5922 OS << "<" << *CP->getMachineCPVal() << ">";
5924 OS << "<" << *CP->getConstVal() << ">";
5926 OS << " + " << offset;
5928 OS << " " << offset;
5929 if (unsigned int TF = CP->getTargetFlags())
5930 OS << " [TF=" << TF << ']';
5931 } else if (const BasicBlockSDNode *BBDN = dyn_cast<BasicBlockSDNode>(this)) {
5933 const Value *LBB = (const Value*)BBDN->getBasicBlock()->getBasicBlock();
5935 OS << LBB->getName() << " ";
5936 OS << (const void*)BBDN->getBasicBlock() << ">";
5937 } else if (const RegisterSDNode *R = dyn_cast<RegisterSDNode>(this)) {
5938 if (G && R->getReg() &&
5939 TargetRegisterInfo::isPhysicalRegister(R->getReg())) {
5940 OS << " %" << G->getTarget().getRegisterInfo()->getName(R->getReg());
5942 OS << " %reg" << R->getReg();
5944 } else if (const ExternalSymbolSDNode *ES =
5945 dyn_cast<ExternalSymbolSDNode>(this)) {
5946 OS << "'" << ES->getSymbol() << "'";
5947 if (unsigned int TF = ES->getTargetFlags())
5948 OS << " [TF=" << TF << ']';
5949 } else if (const SrcValueSDNode *M = dyn_cast<SrcValueSDNode>(this)) {
5951 OS << "<" << M->getValue() << ">";
5954 } else if (const MDNodeSDNode *MD = dyn_cast<MDNodeSDNode>(this)) {
5956 OS << "<" << MD->getMD() << ">";
5959 } else if (const VTSDNode *N = dyn_cast<VTSDNode>(this)) {
5960 OS << ":" << N->getVT().getEVTString();
5962 else if (const LoadSDNode *LD = dyn_cast<LoadSDNode>(this)) {
5963 OS << "<" << *LD->getMemOperand();
5966 switch (LD->getExtensionType()) {
5967 default: doExt = false; break;
5968 case ISD::EXTLOAD: OS << ", anyext"; break;
5969 case ISD::SEXTLOAD: OS << ", sext"; break;
5970 case ISD::ZEXTLOAD: OS << ", zext"; break;
5973 OS << " from " << LD->getMemoryVT().getEVTString();
5975 const char *AM = getIndexedModeName(LD->getAddressingMode());
5980 } else if (const StoreSDNode *ST = dyn_cast<StoreSDNode>(this)) {
5981 OS << "<" << *ST->getMemOperand();
5983 if (ST->isTruncatingStore())
5984 OS << ", trunc to " << ST->getMemoryVT().getEVTString();
5986 const char *AM = getIndexedModeName(ST->getAddressingMode());
5991 } else if (const MemSDNode* M = dyn_cast<MemSDNode>(this)) {
5992 OS << "<" << *M->getMemOperand() << ">";
5993 } else if (const BlockAddressSDNode *BA =
5994 dyn_cast<BlockAddressSDNode>(this)) {
5996 WriteAsOperand(OS, BA->getBlockAddress()->getFunction(), false);
5998 WriteAsOperand(OS, BA->getBlockAddress()->getBasicBlock(), false);
6000 if (unsigned int TF = BA->getTargetFlags())
6001 OS << " [TF=" << TF << ']';
6005 if (unsigned Order = G->GetOrdering(this))
6006 OS << " [ORD=" << Order << ']';
6008 if (getNodeId() != -1)
6009 OS << " [ID=" << getNodeId() << ']';
6011 DebugLoc dl = getDebugLoc();
6012 if (G && !dl.isUnknown()) {
6014 Scope(dl.getScope(G->getMachineFunction().getFunction()->getContext()));
6016 // Omit the directory, since it's usually long and uninteresting.
6018 OS << Scope.getFilename();
6021 OS << ':' << dl.getLine();
6022 if (dl.getCol() != 0)
6023 OS << ':' << dl.getCol();
6027 void SDNode::print(raw_ostream &OS, const SelectionDAG *G) const {
6029 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
6030 if (i) OS << ", "; else OS << " ";
6031 OS << (void*)getOperand(i).getNode();
6032 if (unsigned RN = getOperand(i).getResNo())
6035 print_details(OS, G);
6038 static void printrWithDepthHelper(raw_ostream &OS, const SDNode *N,
6039 const SelectionDAG *G, unsigned depth,
6052 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) {
6054 printrWithDepthHelper(OS, N->getOperand(i).getNode(), G, depth-1, indent+2);
6058 void SDNode::printrWithDepth(raw_ostream &OS, const SelectionDAG *G,
6059 unsigned depth) const {
6060 printrWithDepthHelper(OS, this, G, depth, 0);
6063 void SDNode::printrFull(raw_ostream &OS, const SelectionDAG *G) const {
6064 // Don't print impossibly deep things.
6065 printrWithDepth(OS, G, 100);
6068 void SDNode::dumprWithDepth(const SelectionDAG *G, unsigned depth) const {
6069 printrWithDepth(dbgs(), G, depth);
6072 void SDNode::dumprFull(const SelectionDAG *G) const {
6073 // Don't print impossibly deep things.
6074 dumprWithDepth(G, 100);
6077 static void DumpNodes(const SDNode *N, unsigned indent, const SelectionDAG *G) {
6078 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i)
6079 if (N->getOperand(i).getNode()->hasOneUse())
6080 DumpNodes(N->getOperand(i).getNode(), indent+2, G);
6082 dbgs() << "\n" << std::string(indent+2, ' ')
6083 << (void*)N->getOperand(i).getNode() << ": <multiple use>";
6087 dbgs().indent(indent);
6091 SDValue SelectionDAG::UnrollVectorOp(SDNode *N, unsigned ResNE) {
6092 assert(N->getNumValues() == 1 &&
6093 "Can't unroll a vector with multiple results!");
6095 EVT VT = N->getValueType(0);
6096 unsigned NE = VT.getVectorNumElements();
6097 EVT EltVT = VT.getVectorElementType();
6098 DebugLoc dl = N->getDebugLoc();
6100 SmallVector<SDValue, 8> Scalars;
6101 SmallVector<SDValue, 4> Operands(N->getNumOperands());
6103 // If ResNE is 0, fully unroll the vector op.
6106 else if (NE > ResNE)
6110 for (i= 0; i != NE; ++i) {
6111 for (unsigned j = 0, e = N->getNumOperands(); j != e; ++j) {
6112 SDValue Operand = N->getOperand(j);
6113 EVT OperandVT = Operand.getValueType();
6114 if (OperandVT.isVector()) {
6115 // A vector operand; extract a single element.
6116 EVT OperandEltVT = OperandVT.getVectorElementType();
6117 Operands[j] = getNode(ISD::EXTRACT_VECTOR_ELT, dl,
6120 getConstant(i, MVT::i32));
6122 // A scalar operand; just use it as is.
6123 Operands[j] = Operand;
6127 switch (N->getOpcode()) {
6129 Scalars.push_back(getNode(N->getOpcode(), dl, EltVT,
6130 &Operands[0], Operands.size()));
6137 Scalars.push_back(getNode(N->getOpcode(), dl, EltVT, Operands[0],
6138 getShiftAmountOperand(Operands[1])));
6140 case ISD::SIGN_EXTEND_INREG:
6141 case ISD::FP_ROUND_INREG: {
6142 EVT ExtVT = cast<VTSDNode>(Operands[1])->getVT().getVectorElementType();
6143 Scalars.push_back(getNode(N->getOpcode(), dl, EltVT,
6145 getValueType(ExtVT)));
6150 for (; i < ResNE; ++i)
6151 Scalars.push_back(getUNDEF(EltVT));
6153 return getNode(ISD::BUILD_VECTOR, dl,
6154 EVT::getVectorVT(*getContext(), EltVT, ResNE),
6155 &Scalars[0], Scalars.size());
6159 /// isConsecutiveLoad - Return true if LD is loading 'Bytes' bytes from a
6160 /// location that is 'Dist' units away from the location that the 'Base' load
6161 /// is loading from.
6162 bool SelectionDAG::isConsecutiveLoad(LoadSDNode *LD, LoadSDNode *Base,
6163 unsigned Bytes, int Dist) const {
6164 if (LD->getChain() != Base->getChain())
6166 EVT VT = LD->getValueType(0);
6167 if (VT.getSizeInBits() / 8 != Bytes)
6170 SDValue Loc = LD->getOperand(1);
6171 SDValue BaseLoc = Base->getOperand(1);
6172 if (Loc.getOpcode() == ISD::FrameIndex) {
6173 if (BaseLoc.getOpcode() != ISD::FrameIndex)
6175 const MachineFrameInfo *MFI = getMachineFunction().getFrameInfo();
6176 int FI = cast<FrameIndexSDNode>(Loc)->getIndex();
6177 int BFI = cast<FrameIndexSDNode>(BaseLoc)->getIndex();
6178 int FS = MFI->getObjectSize(FI);
6179 int BFS = MFI->getObjectSize(BFI);
6180 if (FS != BFS || FS != (int)Bytes) return false;
6181 return MFI->getObjectOffset(FI) == (MFI->getObjectOffset(BFI) + Dist*Bytes);
6183 if (Loc.getOpcode() == ISD::ADD && Loc.getOperand(0) == BaseLoc) {
6184 ConstantSDNode *V = dyn_cast<ConstantSDNode>(Loc.getOperand(1));
6185 if (V && (V->getSExtValue() == Dist*Bytes))
6189 const GlobalValue *GV1 = NULL;
6190 const GlobalValue *GV2 = NULL;
6191 int64_t Offset1 = 0;
6192 int64_t Offset2 = 0;
6193 bool isGA1 = TLI.isGAPlusOffset(Loc.getNode(), GV1, Offset1);
6194 bool isGA2 = TLI.isGAPlusOffset(BaseLoc.getNode(), GV2, Offset2);
6195 if (isGA1 && isGA2 && GV1 == GV2)
6196 return Offset1 == (Offset2 + Dist*Bytes);
6201 /// InferPtrAlignment - Infer alignment of a load / store address. Return 0 if
6202 /// it cannot be inferred.
6203 unsigned SelectionDAG::InferPtrAlignment(SDValue Ptr) const {
6204 // If this is a GlobalAddress + cst, return the alignment.
6205 const GlobalValue *GV;
6206 int64_t GVOffset = 0;
6207 if (TLI.isGAPlusOffset(Ptr.getNode(), GV, GVOffset)) {
6208 // If GV has specified alignment, then use it. Otherwise, use the preferred
6210 unsigned Align = GV->getAlignment();
6212 if (const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV)) {
6213 if (GVar->hasInitializer()) {
6214 const TargetData *TD = TLI.getTargetData();
6215 Align = TD->getPreferredAlignment(GVar);
6219 return MinAlign(Align, GVOffset);
6222 // If this is a direct reference to a stack slot, use information about the
6223 // stack slot's alignment.
6224 int FrameIdx = 1 << 31;
6225 int64_t FrameOffset = 0;
6226 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Ptr)) {
6227 FrameIdx = FI->getIndex();
6228 } else if (Ptr.getOpcode() == ISD::ADD &&
6229 isa<ConstantSDNode>(Ptr.getOperand(1)) &&
6230 isa<FrameIndexSDNode>(Ptr.getOperand(0))) {
6231 FrameIdx = cast<FrameIndexSDNode>(Ptr.getOperand(0))->getIndex();
6232 FrameOffset = Ptr.getConstantOperandVal(1);
6235 if (FrameIdx != (1 << 31)) {
6236 // FIXME: Handle FI+CST.
6237 const MachineFrameInfo &MFI = *getMachineFunction().getFrameInfo();
6238 unsigned FIInfoAlign = MinAlign(MFI.getObjectAlignment(FrameIdx),
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());