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 //===----------------------------------------------------------------------===//
13 #include "llvm/CodeGen/SelectionDAG.h"
14 #include "llvm/Constants.h"
15 #include "llvm/Analysis/ValueTracking.h"
16 #include "llvm/GlobalAlias.h"
17 #include "llvm/GlobalVariable.h"
18 #include "llvm/Intrinsics.h"
19 #include "llvm/DerivedTypes.h"
20 #include "llvm/Assembly/Writer.h"
21 #include "llvm/CallingConv.h"
22 #include "llvm/CodeGen/MachineBasicBlock.h"
23 #include "llvm/CodeGen/MachineConstantPool.h"
24 #include "llvm/CodeGen/MachineFrameInfo.h"
25 #include "llvm/CodeGen/MachineModuleInfo.h"
26 #include "llvm/CodeGen/PseudoSourceValue.h"
27 #include "llvm/Support/MathExtras.h"
28 #include "llvm/Target/TargetRegisterInfo.h"
29 #include "llvm/Target/TargetData.h"
30 #include "llvm/Target/TargetLowering.h"
31 #include "llvm/Target/TargetInstrInfo.h"
32 #include "llvm/Target/TargetMachine.h"
33 #include "llvm/ADT/SetVector.h"
34 #include "llvm/ADT/SmallPtrSet.h"
35 #include "llvm/ADT/SmallSet.h"
36 #include "llvm/ADT/SmallVector.h"
37 #include "llvm/ADT/StringExtras.h"
42 /// makeVTList - Return an instance of the SDVTList struct initialized with the
43 /// specified members.
44 static SDVTList makeVTList(const MVT *VTs, unsigned NumVTs) {
45 SDVTList Res = {VTs, NumVTs};
49 static const fltSemantics *MVTToAPFloatSemantics(MVT VT) {
50 switch (VT.getSimpleVT()) {
51 default: assert(0 && "Unknown FP format");
52 case MVT::f32: return &APFloat::IEEEsingle;
53 case MVT::f64: return &APFloat::IEEEdouble;
54 case MVT::f80: return &APFloat::x87DoubleExtended;
55 case MVT::f128: return &APFloat::IEEEquad;
56 case MVT::ppcf128: return &APFloat::PPCDoubleDouble;
60 SelectionDAG::DAGUpdateListener::~DAGUpdateListener() {}
62 //===----------------------------------------------------------------------===//
63 // ConstantFPSDNode Class
64 //===----------------------------------------------------------------------===//
66 /// isExactlyValue - We don't rely on operator== working on double values, as
67 /// it returns true for things that are clearly not equal, like -0.0 and 0.0.
68 /// As such, this method can be used to do an exact bit-for-bit comparison of
69 /// two floating point values.
70 bool ConstantFPSDNode::isExactlyValue(const APFloat& V) const {
71 return Value.bitwiseIsEqual(V);
74 bool ConstantFPSDNode::isValueValidForType(MVT VT,
76 assert(VT.isFloatingPoint() && "Can only convert between FP types");
78 // PPC long double cannot be converted to any other type.
79 if (VT == MVT::ppcf128 ||
80 &Val.getSemantics() == &APFloat::PPCDoubleDouble)
83 // convert modifies in place, so make a copy.
84 APFloat Val2 = APFloat(Val);
85 return Val2.convert(*MVTToAPFloatSemantics(VT),
86 APFloat::rmNearestTiesToEven) == APFloat::opOK;
89 //===----------------------------------------------------------------------===//
91 //===----------------------------------------------------------------------===//
93 /// isBuildVectorAllOnes - Return true if the specified node is a
94 /// BUILD_VECTOR where all of the elements are ~0 or undef.
95 bool ISD::isBuildVectorAllOnes(const SDNode *N) {
96 // Look through a bit convert.
97 if (N->getOpcode() == ISD::BIT_CONVERT)
98 N = N->getOperand(0).Val;
100 if (N->getOpcode() != ISD::BUILD_VECTOR) return false;
102 unsigned i = 0, e = N->getNumOperands();
104 // Skip over all of the undef values.
105 while (i != e && N->getOperand(i).getOpcode() == ISD::UNDEF)
108 // Do not accept an all-undef vector.
109 if (i == e) return false;
111 // Do not accept build_vectors that aren't all constants or which have non-~0
113 SDOperand NotZero = N->getOperand(i);
114 if (isa<ConstantSDNode>(NotZero)) {
115 if (!cast<ConstantSDNode>(NotZero)->isAllOnesValue())
117 } else if (isa<ConstantFPSDNode>(NotZero)) {
118 if (!cast<ConstantFPSDNode>(NotZero)->getValueAPF().
119 convertToAPInt().isAllOnesValue())
124 // Okay, we have at least one ~0 value, check to see if the rest match or are
126 for (++i; i != e; ++i)
127 if (N->getOperand(i) != NotZero &&
128 N->getOperand(i).getOpcode() != ISD::UNDEF)
134 /// isBuildVectorAllZeros - Return true if the specified node is a
135 /// BUILD_VECTOR where all of the elements are 0 or undef.
136 bool ISD::isBuildVectorAllZeros(const SDNode *N) {
137 // Look through a bit convert.
138 if (N->getOpcode() == ISD::BIT_CONVERT)
139 N = N->getOperand(0).Val;
141 if (N->getOpcode() != ISD::BUILD_VECTOR) return false;
143 unsigned i = 0, e = N->getNumOperands();
145 // Skip over all of the undef values.
146 while (i != e && N->getOperand(i).getOpcode() == ISD::UNDEF)
149 // Do not accept an all-undef vector.
150 if (i == e) return false;
152 // Do not accept build_vectors that aren't all constants or which have non-~0
154 SDOperand Zero = N->getOperand(i);
155 if (isa<ConstantSDNode>(Zero)) {
156 if (!cast<ConstantSDNode>(Zero)->isNullValue())
158 } else if (isa<ConstantFPSDNode>(Zero)) {
159 if (!cast<ConstantFPSDNode>(Zero)->getValueAPF().isPosZero())
164 // Okay, we have at least one ~0 value, check to see if the rest match or are
166 for (++i; i != e; ++i)
167 if (N->getOperand(i) != Zero &&
168 N->getOperand(i).getOpcode() != ISD::UNDEF)
173 /// isScalarToVector - Return true if the specified node is a
174 /// ISD::SCALAR_TO_VECTOR node or a BUILD_VECTOR node where only the low
175 /// element is not an undef.
176 bool ISD::isScalarToVector(const SDNode *N) {
177 if (N->getOpcode() == ISD::SCALAR_TO_VECTOR)
180 if (N->getOpcode() != ISD::BUILD_VECTOR)
182 if (N->getOperand(0).getOpcode() == ISD::UNDEF)
184 unsigned NumElems = N->getNumOperands();
185 for (unsigned i = 1; i < NumElems; ++i) {
186 SDOperand V = N->getOperand(i);
187 if (V.getOpcode() != ISD::UNDEF)
194 /// isDebugLabel - Return true if the specified node represents a debug
195 /// label (i.e. ISD::LABEL or TargetInstrInfo::LABEL node and third operand
197 bool ISD::isDebugLabel(const SDNode *N) {
199 if (N->getOpcode() == ISD::LABEL)
200 Zero = N->getOperand(2);
201 else if (N->isTargetOpcode() &&
202 N->getTargetOpcode() == TargetInstrInfo::LABEL)
203 // Chain moved to last operand.
204 Zero = N->getOperand(1);
207 return isa<ConstantSDNode>(Zero) && cast<ConstantSDNode>(Zero)->isNullValue();
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.
230 if (Operation > ISD::SETTRUE2)
231 Operation &= ~8; // Don't let N and U bits get set.
232 return ISD::CondCode(Operation);
236 /// isSignedOp - For an integer comparison, return 1 if the comparison is a
237 /// signed operation and 2 if the result is an unsigned comparison. Return zero
238 /// if the operation does not depend on the sign of the input (setne and seteq).
239 static int isSignedOp(ISD::CondCode Opcode) {
241 default: assert(0 && "Illegal integer setcc operation!");
243 case ISD::SETNE: return 0;
247 case ISD::SETGE: return 1;
251 case ISD::SETUGE: return 2;
255 /// getSetCCOrOperation - Return the result of a logical OR between different
256 /// comparisons of identical values: ((X op1 Y) | (X op2 Y)). This function
257 /// returns SETCC_INVALID if it is not possible to represent the resultant
259 ISD::CondCode ISD::getSetCCOrOperation(ISD::CondCode Op1, ISD::CondCode Op2,
261 if (isInteger && (isSignedOp(Op1) | isSignedOp(Op2)) == 3)
262 // Cannot fold a signed integer setcc with an unsigned integer setcc.
263 return ISD::SETCC_INVALID;
265 unsigned Op = Op1 | Op2; // Combine all of the condition bits.
267 // If the N and U bits get set then the resultant comparison DOES suddenly
268 // care about orderedness, and is true when ordered.
269 if (Op > ISD::SETTRUE2)
270 Op &= ~16; // Clear the U bit if the N bit is set.
272 // Canonicalize illegal integer setcc's.
273 if (isInteger && Op == ISD::SETUNE) // e.g. SETUGT | SETULT
276 return ISD::CondCode(Op);
279 /// getSetCCAndOperation - Return the result of a logical AND between different
280 /// comparisons of identical values: ((X op1 Y) & (X op2 Y)). This
281 /// function returns zero if it is not possible to represent the resultant
283 ISD::CondCode ISD::getSetCCAndOperation(ISD::CondCode Op1, ISD::CondCode Op2,
285 if (isInteger && (isSignedOp(Op1) | isSignedOp(Op2)) == 3)
286 // Cannot fold a signed setcc with an unsigned setcc.
287 return ISD::SETCC_INVALID;
289 // Combine all of the condition bits.
290 ISD::CondCode Result = ISD::CondCode(Op1 & Op2);
292 // Canonicalize illegal integer setcc's.
296 case ISD::SETUO : Result = ISD::SETFALSE; break; // SETUGT & SETULT
297 case ISD::SETOEQ: // SETEQ & SETU[LG]E
298 case ISD::SETUEQ: Result = ISD::SETEQ ; break; // SETUGE & SETULE
299 case ISD::SETOLT: Result = ISD::SETULT ; break; // SETULT & SETNE
300 case ISD::SETOGT: Result = ISD::SETUGT ; break; // SETUGT & SETNE
307 const TargetMachine &SelectionDAG::getTarget() const {
308 return TLI.getTargetMachine();
311 //===----------------------------------------------------------------------===//
312 // SDNode Profile Support
313 //===----------------------------------------------------------------------===//
315 /// AddNodeIDOpcode - Add the node opcode to the NodeID data.
317 static void AddNodeIDOpcode(FoldingSetNodeID &ID, unsigned OpC) {
321 /// AddNodeIDValueTypes - Value type lists are intern'd so we can represent them
322 /// solely with their pointer.
323 static void AddNodeIDValueTypes(FoldingSetNodeID &ID, SDVTList VTList) {
324 ID.AddPointer(VTList.VTs);
327 /// AddNodeIDOperands - Various routines for adding operands to the NodeID data.
329 static void AddNodeIDOperands(FoldingSetNodeID &ID,
330 SDOperandPtr Ops, unsigned NumOps) {
331 for (; NumOps; --NumOps, ++Ops) {
332 ID.AddPointer(Ops->Val);
333 ID.AddInteger(Ops->ResNo);
337 static void AddNodeIDNode(FoldingSetNodeID &ID,
338 unsigned short OpC, SDVTList VTList,
339 SDOperandPtr OpList, unsigned N) {
340 AddNodeIDOpcode(ID, OpC);
341 AddNodeIDValueTypes(ID, VTList);
342 AddNodeIDOperands(ID, OpList, N);
346 /// AddNodeIDNode - Generic routine for adding a nodes info to the NodeID
348 static void AddNodeIDNode(FoldingSetNodeID &ID, SDNode *N) {
349 AddNodeIDOpcode(ID, N->getOpcode());
350 // Add the return value info.
351 AddNodeIDValueTypes(ID, N->getVTList());
352 // Add the operand info.
353 AddNodeIDOperands(ID, N->op_begin(), N->getNumOperands());
355 // Handle SDNode leafs with special info.
356 switch (N->getOpcode()) {
357 default: break; // Normal nodes don't need extra info.
359 ID.AddInteger(cast<ARG_FLAGSSDNode>(N)->getArgFlags().getRawBits());
361 case ISD::TargetConstant:
363 ID.Add(cast<ConstantSDNode>(N)->getAPIntValue());
365 case ISD::TargetConstantFP:
366 case ISD::ConstantFP: {
367 ID.Add(cast<ConstantFPSDNode>(N)->getValueAPF());
370 case ISD::TargetGlobalAddress:
371 case ISD::GlobalAddress:
372 case ISD::TargetGlobalTLSAddress:
373 case ISD::GlobalTLSAddress: {
374 GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(N);
375 ID.AddPointer(GA->getGlobal());
376 ID.AddInteger(GA->getOffset());
379 case ISD::BasicBlock:
380 ID.AddPointer(cast<BasicBlockSDNode>(N)->getBasicBlock());
383 ID.AddInteger(cast<RegisterSDNode>(N)->getReg());
386 ID.AddPointer(cast<SrcValueSDNode>(N)->getValue());
388 case ISD::MEMOPERAND: {
389 const MachineMemOperand &MO = cast<MemOperandSDNode>(N)->MO;
390 ID.AddPointer(MO.getValue());
391 ID.AddInteger(MO.getFlags());
392 ID.AddInteger(MO.getOffset());
393 ID.AddInteger(MO.getSize());
394 ID.AddInteger(MO.getAlignment());
397 case ISD::FrameIndex:
398 case ISD::TargetFrameIndex:
399 ID.AddInteger(cast<FrameIndexSDNode>(N)->getIndex());
402 case ISD::TargetJumpTable:
403 ID.AddInteger(cast<JumpTableSDNode>(N)->getIndex());
405 case ISD::ConstantPool:
406 case ISD::TargetConstantPool: {
407 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(N);
408 ID.AddInteger(CP->getAlignment());
409 ID.AddInteger(CP->getOffset());
410 if (CP->isMachineConstantPoolEntry())
411 CP->getMachineCPVal()->AddSelectionDAGCSEId(ID);
413 ID.AddPointer(CP->getConstVal());
417 LoadSDNode *LD = cast<LoadSDNode>(N);
418 ID.AddInteger(LD->getAddressingMode());
419 ID.AddInteger(LD->getExtensionType());
420 ID.AddInteger(LD->getMemoryVT().getRawBits());
421 ID.AddInteger(LD->getAlignment());
422 ID.AddInteger(LD->isVolatile());
426 StoreSDNode *ST = cast<StoreSDNode>(N);
427 ID.AddInteger(ST->getAddressingMode());
428 ID.AddInteger(ST->isTruncatingStore());
429 ID.AddInteger(ST->getMemoryVT().getRawBits());
430 ID.AddInteger(ST->getAlignment());
431 ID.AddInteger(ST->isVolatile());
434 case ISD::ATOMIC_CMP_SWAP:
435 case ISD::ATOMIC_LOAD_ADD:
436 case ISD::ATOMIC_SWAP:
437 case ISD::ATOMIC_LOAD_SUB:
438 case ISD::ATOMIC_LOAD_AND:
439 case ISD::ATOMIC_LOAD_OR:
440 case ISD::ATOMIC_LOAD_XOR:
441 case ISD::ATOMIC_LOAD_NAND:
442 case ISD::ATOMIC_LOAD_MIN:
443 case ISD::ATOMIC_LOAD_MAX:
444 case ISD::ATOMIC_LOAD_UMIN:
445 case ISD::ATOMIC_LOAD_UMAX: {
446 AtomicSDNode *AT = cast<AtomicSDNode>(N);
447 ID.AddInteger(AT->getAlignment());
448 ID.AddInteger(AT->isVolatile());
451 } // end switch (N->getOpcode())
454 //===----------------------------------------------------------------------===//
455 // SelectionDAG Class
456 //===----------------------------------------------------------------------===//
458 /// RemoveDeadNodes - This method deletes all unreachable nodes in the
460 void SelectionDAG::RemoveDeadNodes() {
461 // Create a dummy node (which is not added to allnodes), that adds a reference
462 // to the root node, preventing it from being deleted.
463 HandleSDNode Dummy(getRoot());
465 SmallVector<SDNode*, 128> DeadNodes;
467 // Add all obviously-dead nodes to the DeadNodes worklist.
468 for (allnodes_iterator I = allnodes_begin(), E = allnodes_end(); I != E; ++I)
470 DeadNodes.push_back(I);
472 // Process the worklist, deleting the nodes and adding their uses to the
474 while (!DeadNodes.empty()) {
475 SDNode *N = DeadNodes.back();
476 DeadNodes.pop_back();
478 // Take the node out of the appropriate CSE map.
479 RemoveNodeFromCSEMaps(N);
481 // Next, brutally remove the operand list. This is safe to do, as there are
482 // no cycles in the graph.
483 for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ++I) {
484 SDNode *Operand = I->getVal();
485 Operand->removeUser(std::distance(N->op_begin(), I), N);
487 // Now that we removed this operand, see if there are no uses of it left.
488 if (Operand->use_empty())
489 DeadNodes.push_back(Operand);
491 if (N->OperandsNeedDelete) {
492 delete[] N->OperandList;
497 // Finally, remove N itself.
501 // If the root changed (e.g. it was a dead load, update the root).
502 setRoot(Dummy.getValue());
505 void SelectionDAG::RemoveDeadNode(SDNode *N, DAGUpdateListener *UpdateListener){
506 SmallVector<SDNode*, 16> DeadNodes;
507 DeadNodes.push_back(N);
509 // Process the worklist, deleting the nodes and adding their uses to the
511 while (!DeadNodes.empty()) {
512 SDNode *N = DeadNodes.back();
513 DeadNodes.pop_back();
516 UpdateListener->NodeDeleted(N, 0);
518 // Take the node out of the appropriate CSE map.
519 RemoveNodeFromCSEMaps(N);
521 // Next, brutally remove the operand list. This is safe to do, as there are
522 // no cycles in the graph.
523 for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ++I) {
524 SDNode *Operand = I->getVal();
525 Operand->removeUser(std::distance(N->op_begin(), I), N);
527 // Now that we removed this operand, see if there are no uses of it left.
528 if (Operand->use_empty())
529 DeadNodes.push_back(Operand);
531 if (N->OperandsNeedDelete) {
532 delete[] N->OperandList;
537 // Finally, remove N itself.
542 void SelectionDAG::DeleteNode(SDNode *N) {
543 assert(N->use_empty() && "Cannot delete a node that is not dead!");
545 // First take this out of the appropriate CSE map.
546 RemoveNodeFromCSEMaps(N);
548 // Finally, remove uses due to operands of this node, remove from the
549 // AllNodes list, and delete the node.
550 DeleteNodeNotInCSEMaps(N);
553 void SelectionDAG::DeleteNodeNotInCSEMaps(SDNode *N) {
555 // Remove it from the AllNodes list.
558 // Drop all of the operands and decrement used nodes use counts.
559 for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ++I)
560 I->getVal()->removeUser(std::distance(N->op_begin(), I), N);
561 if (N->OperandsNeedDelete) {
562 delete[] N->OperandList;
570 /// RemoveNodeFromCSEMaps - Take the specified node out of the CSE map that
571 /// correspond to it. This is useful when we're about to delete or repurpose
572 /// the node. We don't want future request for structurally identical nodes
573 /// to return N anymore.
574 void SelectionDAG::RemoveNodeFromCSEMaps(SDNode *N) {
576 switch (N->getOpcode()) {
577 case ISD::HANDLENODE: return; // noop.
579 Erased = StringNodes.erase(cast<StringSDNode>(N)->getValue());
582 assert(CondCodeNodes[cast<CondCodeSDNode>(N)->get()] &&
583 "Cond code doesn't exist!");
584 Erased = CondCodeNodes[cast<CondCodeSDNode>(N)->get()] != 0;
585 CondCodeNodes[cast<CondCodeSDNode>(N)->get()] = 0;
587 case ISD::ExternalSymbol:
588 Erased = ExternalSymbols.erase(cast<ExternalSymbolSDNode>(N)->getSymbol());
590 case ISD::TargetExternalSymbol:
592 TargetExternalSymbols.erase(cast<ExternalSymbolSDNode>(N)->getSymbol());
594 case ISD::VALUETYPE: {
595 MVT VT = cast<VTSDNode>(N)->getVT();
596 if (VT.isExtended()) {
597 Erased = ExtendedValueTypeNodes.erase(VT);
599 Erased = ValueTypeNodes[VT.getSimpleVT()] != 0;
600 ValueTypeNodes[VT.getSimpleVT()] = 0;
605 // Remove it from the CSE Map.
606 Erased = CSEMap.RemoveNode(N);
610 // Verify that the node was actually in one of the CSE maps, unless it has a
611 // flag result (which cannot be CSE'd) or is one of the special cases that are
612 // not subject to CSE.
613 if (!Erased && N->getValueType(N->getNumValues()-1) != MVT::Flag &&
614 !N->isTargetOpcode()) {
617 assert(0 && "Node is not in map!");
622 /// AddNonLeafNodeToCSEMaps - Add the specified node back to the CSE maps. It
623 /// has been taken out and modified in some way. If the specified node already
624 /// exists in the CSE maps, do not modify the maps, but return the existing node
625 /// instead. If it doesn't exist, add it and return null.
627 SDNode *SelectionDAG::AddNonLeafNodeToCSEMaps(SDNode *N) {
628 assert(N->getNumOperands() && "This is a leaf node!");
629 if (N->getOpcode() == ISD::HANDLENODE || N->getValueType(0) == MVT::Flag)
630 return 0; // Never add these nodes.
632 // Check that remaining values produced are not flags.
633 for (unsigned i = 1, e = N->getNumValues(); i != e; ++i)
634 if (N->getValueType(i) == MVT::Flag)
635 return 0; // Never CSE anything that produces a flag.
637 SDNode *New = CSEMap.GetOrInsertNode(N);
638 if (New != N) return New; // Node already existed.
642 /// FindModifiedNodeSlot - Find a slot for the specified node if its operands
643 /// were replaced with those specified. If this node is never memoized,
644 /// return null, otherwise return a pointer to the slot it would take. If a
645 /// node already exists with these operands, the slot will be non-null.
646 SDNode *SelectionDAG::FindModifiedNodeSlot(SDNode *N, SDOperand Op,
648 if (N->getOpcode() == ISD::HANDLENODE || N->getValueType(0) == MVT::Flag)
649 return 0; // Never add these nodes.
651 // Check that remaining values produced are not flags.
652 for (unsigned i = 1, e = N->getNumValues(); i != e; ++i)
653 if (N->getValueType(i) == MVT::Flag)
654 return 0; // Never CSE anything that produces a flag.
656 SDOperand Ops[] = { Op };
658 AddNodeIDNode(ID, N->getOpcode(), N->getVTList(), Ops, 1);
659 return CSEMap.FindNodeOrInsertPos(ID, InsertPos);
662 /// FindModifiedNodeSlot - Find a slot for the specified node if its operands
663 /// were replaced with those specified. If this node is never memoized,
664 /// return null, otherwise return a pointer to the slot it would take. If a
665 /// node already exists with these operands, the slot will be non-null.
666 SDNode *SelectionDAG::FindModifiedNodeSlot(SDNode *N,
667 SDOperand Op1, SDOperand Op2,
669 if (N->getOpcode() == ISD::HANDLENODE || N->getValueType(0) == MVT::Flag)
670 return 0; // Never add these nodes.
672 // Check that remaining values produced are not flags.
673 for (unsigned i = 1, e = N->getNumValues(); i != e; ++i)
674 if (N->getValueType(i) == MVT::Flag)
675 return 0; // Never CSE anything that produces a flag.
677 SDOperand Ops[] = { Op1, Op2 };
679 AddNodeIDNode(ID, N->getOpcode(), N->getVTList(), Ops, 2);
680 return CSEMap.FindNodeOrInsertPos(ID, InsertPos);
684 /// FindModifiedNodeSlot - Find a slot for the specified node if its operands
685 /// were replaced with those specified. If this node is never memoized,
686 /// return null, otherwise return a pointer to the slot it would take. If a
687 /// node already exists with these operands, the slot will be non-null.
688 SDNode *SelectionDAG::FindModifiedNodeSlot(SDNode *N,
689 SDOperandPtr Ops,unsigned NumOps,
691 if (N->getOpcode() == ISD::HANDLENODE || N->getValueType(0) == MVT::Flag)
692 return 0; // Never add these nodes.
694 // Check that remaining values produced are not flags.
695 for (unsigned i = 1, e = N->getNumValues(); i != e; ++i)
696 if (N->getValueType(i) == MVT::Flag)
697 return 0; // Never CSE anything that produces a flag.
700 AddNodeIDNode(ID, N->getOpcode(), N->getVTList(), Ops, NumOps);
702 if (const LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
703 ID.AddInteger(LD->getAddressingMode());
704 ID.AddInteger(LD->getExtensionType());
705 ID.AddInteger(LD->getMemoryVT().getRawBits());
706 ID.AddInteger(LD->getAlignment());
707 ID.AddInteger(LD->isVolatile());
708 } else if (const StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
709 ID.AddInteger(ST->getAddressingMode());
710 ID.AddInteger(ST->isTruncatingStore());
711 ID.AddInteger(ST->getMemoryVT().getRawBits());
712 ID.AddInteger(ST->getAlignment());
713 ID.AddInteger(ST->isVolatile());
716 return CSEMap.FindNodeOrInsertPos(ID, InsertPos);
720 SelectionDAG::~SelectionDAG() {
721 while (!AllNodes.empty()) {
722 SDNode *N = AllNodes.begin();
723 N->SetNextInBucket(0);
724 if (N->OperandsNeedDelete) {
725 delete [] N->OperandList;
729 AllNodes.pop_front();
733 SDOperand SelectionDAG::getZeroExtendInReg(SDOperand Op, MVT VT) {
734 if (Op.getValueType() == VT) return Op;
735 APInt Imm = APInt::getLowBitsSet(Op.getValueSizeInBits(),
737 return getNode(ISD::AND, Op.getValueType(), Op,
738 getConstant(Imm, Op.getValueType()));
741 SDOperand SelectionDAG::getString(const std::string &Val) {
742 StringSDNode *&N = StringNodes[Val];
744 N = new StringSDNode(Val);
745 AllNodes.push_back(N);
747 return SDOperand(N, 0);
750 SDOperand SelectionDAG::getConstant(uint64_t Val, MVT VT, bool isT) {
752 VT.isVector() ? VT.getVectorElementType() : VT;
754 return getConstant(APInt(EltVT.getSizeInBits(), Val), VT, isT);
757 SDOperand SelectionDAG::getConstant(const APInt &Val, MVT VT, bool isT) {
758 assert(VT.isInteger() && "Cannot create FP integer constant!");
761 VT.isVector() ? VT.getVectorElementType() : VT;
763 assert(Val.getBitWidth() == EltVT.getSizeInBits() &&
764 "APInt size does not match type size!");
766 unsigned Opc = isT ? ISD::TargetConstant : ISD::Constant;
768 AddNodeIDNode(ID, Opc, getVTList(EltVT), (SDOperand*)0, 0);
772 if ((N = CSEMap.FindNodeOrInsertPos(ID, IP)))
774 return SDOperand(N, 0);
776 N = new ConstantSDNode(isT, Val, EltVT);
777 CSEMap.InsertNode(N, IP);
778 AllNodes.push_back(N);
781 SDOperand Result(N, 0);
783 SmallVector<SDOperand, 8> Ops;
784 Ops.assign(VT.getVectorNumElements(), Result);
785 Result = getNode(ISD::BUILD_VECTOR, VT, &Ops[0], Ops.size());
790 SDOperand SelectionDAG::getIntPtrConstant(uint64_t Val, bool isTarget) {
791 return getConstant(Val, TLI.getPointerTy(), isTarget);
795 SDOperand SelectionDAG::getConstantFP(const APFloat& V, MVT VT, bool isTarget) {
796 assert(VT.isFloatingPoint() && "Cannot create integer FP constant!");
799 VT.isVector() ? VT.getVectorElementType() : VT;
801 // Do the map lookup using the actual bit pattern for the floating point
802 // value, so that we don't have problems with 0.0 comparing equal to -0.0, and
803 // we don't have issues with SNANs.
804 unsigned Opc = isTarget ? ISD::TargetConstantFP : ISD::ConstantFP;
806 AddNodeIDNode(ID, Opc, getVTList(EltVT), (SDOperand*)0, 0);
810 if ((N = CSEMap.FindNodeOrInsertPos(ID, IP)))
812 return SDOperand(N, 0);
814 N = new ConstantFPSDNode(isTarget, V, EltVT);
815 CSEMap.InsertNode(N, IP);
816 AllNodes.push_back(N);
819 SDOperand Result(N, 0);
821 SmallVector<SDOperand, 8> Ops;
822 Ops.assign(VT.getVectorNumElements(), Result);
823 Result = getNode(ISD::BUILD_VECTOR, VT, &Ops[0], Ops.size());
828 SDOperand SelectionDAG::getConstantFP(double Val, MVT VT, bool isTarget) {
830 VT.isVector() ? VT.getVectorElementType() : VT;
832 return getConstantFP(APFloat((float)Val), VT, isTarget);
834 return getConstantFP(APFloat(Val), VT, isTarget);
837 SDOperand SelectionDAG::getGlobalAddress(const GlobalValue *GV,
842 const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV);
844 // If GV is an alias then use the aliasee for determining thread-localness.
845 if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV))
846 GVar = dyn_cast_or_null<GlobalVariable>(GA->resolveAliasedGlobal());
849 if (GVar && GVar->isThreadLocal())
850 Opc = isTargetGA ? ISD::TargetGlobalTLSAddress : ISD::GlobalTLSAddress;
852 Opc = isTargetGA ? ISD::TargetGlobalAddress : ISD::GlobalAddress;
855 AddNodeIDNode(ID, Opc, getVTList(VT), (SDOperand*)0, 0);
857 ID.AddInteger(Offset);
859 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
860 return SDOperand(E, 0);
861 SDNode *N = new GlobalAddressSDNode(isTargetGA, GV, VT, Offset);
862 CSEMap.InsertNode(N, IP);
863 AllNodes.push_back(N);
864 return SDOperand(N, 0);
867 SDOperand SelectionDAG::getFrameIndex(int FI, MVT VT, bool isTarget) {
868 unsigned Opc = isTarget ? ISD::TargetFrameIndex : ISD::FrameIndex;
870 AddNodeIDNode(ID, Opc, getVTList(VT), (SDOperand*)0, 0);
873 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
874 return SDOperand(E, 0);
875 SDNode *N = new FrameIndexSDNode(FI, VT, isTarget);
876 CSEMap.InsertNode(N, IP);
877 AllNodes.push_back(N);
878 return SDOperand(N, 0);
881 SDOperand SelectionDAG::getJumpTable(int JTI, MVT VT, bool isTarget){
882 unsigned Opc = isTarget ? ISD::TargetJumpTable : ISD::JumpTable;
884 AddNodeIDNode(ID, Opc, getVTList(VT), (SDOperand*)0, 0);
887 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
888 return SDOperand(E, 0);
889 SDNode *N = new JumpTableSDNode(JTI, VT, isTarget);
890 CSEMap.InsertNode(N, IP);
891 AllNodes.push_back(N);
892 return SDOperand(N, 0);
895 SDOperand SelectionDAG::getConstantPool(Constant *C, MVT VT,
896 unsigned Alignment, int Offset,
898 unsigned Opc = isTarget ? ISD::TargetConstantPool : ISD::ConstantPool;
900 AddNodeIDNode(ID, Opc, getVTList(VT), (SDOperand*)0, 0);
901 ID.AddInteger(Alignment);
902 ID.AddInteger(Offset);
905 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
906 return SDOperand(E, 0);
907 SDNode *N = new ConstantPoolSDNode(isTarget, C, VT, Offset, Alignment);
908 CSEMap.InsertNode(N, IP);
909 AllNodes.push_back(N);
910 return SDOperand(N, 0);
914 SDOperand SelectionDAG::getConstantPool(MachineConstantPoolValue *C, MVT VT,
915 unsigned Alignment, int Offset,
917 unsigned Opc = isTarget ? ISD::TargetConstantPool : ISD::ConstantPool;
919 AddNodeIDNode(ID, Opc, getVTList(VT), (SDOperand*)0, 0);
920 ID.AddInteger(Alignment);
921 ID.AddInteger(Offset);
922 C->AddSelectionDAGCSEId(ID);
924 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
925 return SDOperand(E, 0);
926 SDNode *N = new ConstantPoolSDNode(isTarget, C, VT, Offset, Alignment);
927 CSEMap.InsertNode(N, IP);
928 AllNodes.push_back(N);
929 return SDOperand(N, 0);
933 SDOperand SelectionDAG::getBasicBlock(MachineBasicBlock *MBB) {
935 AddNodeIDNode(ID, ISD::BasicBlock, getVTList(MVT::Other), (SDOperand*)0, 0);
938 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
939 return SDOperand(E, 0);
940 SDNode *N = new BasicBlockSDNode(MBB);
941 CSEMap.InsertNode(N, IP);
942 AllNodes.push_back(N);
943 return SDOperand(N, 0);
946 SDOperand SelectionDAG::getArgFlags(ISD::ArgFlagsTy Flags) {
948 AddNodeIDNode(ID, ISD::ARG_FLAGS, getVTList(MVT::Other), (SDOperand*)0, 0);
949 ID.AddInteger(Flags.getRawBits());
951 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
952 return SDOperand(E, 0);
953 SDNode *N = new ARG_FLAGSSDNode(Flags);
954 CSEMap.InsertNode(N, IP);
955 AllNodes.push_back(N);
956 return SDOperand(N, 0);
959 SDOperand SelectionDAG::getValueType(MVT VT) {
960 if (VT.isSimple() && (unsigned)VT.getSimpleVT() >= ValueTypeNodes.size())
961 ValueTypeNodes.resize(VT.getSimpleVT()+1);
963 SDNode *&N = VT.isExtended() ?
964 ExtendedValueTypeNodes[VT] : ValueTypeNodes[VT.getSimpleVT()];
966 if (N) return SDOperand(N, 0);
967 N = new VTSDNode(VT);
968 AllNodes.push_back(N);
969 return SDOperand(N, 0);
972 SDOperand SelectionDAG::getExternalSymbol(const char *Sym, MVT VT) {
973 SDNode *&N = ExternalSymbols[Sym];
974 if (N) return SDOperand(N, 0);
975 N = new ExternalSymbolSDNode(false, Sym, VT);
976 AllNodes.push_back(N);
977 return SDOperand(N, 0);
980 SDOperand SelectionDAG::getTargetExternalSymbol(const char *Sym, MVT VT) {
981 SDNode *&N = TargetExternalSymbols[Sym];
982 if (N) return SDOperand(N, 0);
983 N = new ExternalSymbolSDNode(true, Sym, VT);
984 AllNodes.push_back(N);
985 return SDOperand(N, 0);
988 SDOperand SelectionDAG::getCondCode(ISD::CondCode Cond) {
989 if ((unsigned)Cond >= CondCodeNodes.size())
990 CondCodeNodes.resize(Cond+1);
992 if (CondCodeNodes[Cond] == 0) {
993 CondCodeNodes[Cond] = new CondCodeSDNode(Cond);
994 AllNodes.push_back(CondCodeNodes[Cond]);
996 return SDOperand(CondCodeNodes[Cond], 0);
999 SDOperand SelectionDAG::getRegister(unsigned RegNo, MVT VT) {
1000 FoldingSetNodeID ID;
1001 AddNodeIDNode(ID, ISD::Register, getVTList(VT), (SDOperand*)0, 0);
1002 ID.AddInteger(RegNo);
1004 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1005 return SDOperand(E, 0);
1006 SDNode *N = new RegisterSDNode(RegNo, VT);
1007 CSEMap.InsertNode(N, IP);
1008 AllNodes.push_back(N);
1009 return SDOperand(N, 0);
1012 SDOperand SelectionDAG::getSrcValue(const Value *V) {
1013 assert((!V || isa<PointerType>(V->getType())) &&
1014 "SrcValue is not a pointer?");
1016 FoldingSetNodeID ID;
1017 AddNodeIDNode(ID, ISD::SRCVALUE, getVTList(MVT::Other), (SDOperand*)0, 0);
1021 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1022 return SDOperand(E, 0);
1024 SDNode *N = new SrcValueSDNode(V);
1025 CSEMap.InsertNode(N, IP);
1026 AllNodes.push_back(N);
1027 return SDOperand(N, 0);
1030 SDOperand SelectionDAG::getMemOperand(const MachineMemOperand &MO) {
1031 const Value *v = MO.getValue();
1032 assert((!v || isa<PointerType>(v->getType())) &&
1033 "SrcValue is not a pointer?");
1035 FoldingSetNodeID ID;
1036 AddNodeIDNode(ID, ISD::MEMOPERAND, getVTList(MVT::Other), (SDOperand*)0, 0);
1038 ID.AddInteger(MO.getFlags());
1039 ID.AddInteger(MO.getOffset());
1040 ID.AddInteger(MO.getSize());
1041 ID.AddInteger(MO.getAlignment());
1044 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1045 return SDOperand(E, 0);
1047 SDNode *N = new MemOperandSDNode(MO);
1048 CSEMap.InsertNode(N, IP);
1049 AllNodes.push_back(N);
1050 return SDOperand(N, 0);
1053 /// CreateStackTemporary - Create a stack temporary, suitable for holding the
1054 /// specified value type.
1055 SDOperand SelectionDAG::CreateStackTemporary(MVT VT) {
1056 MachineFrameInfo *FrameInfo = getMachineFunction().getFrameInfo();
1057 unsigned ByteSize = VT.getSizeInBits()/8;
1058 const Type *Ty = VT.getTypeForMVT();
1059 unsigned StackAlign = (unsigned)TLI.getTargetData()->getPrefTypeAlignment(Ty);
1060 int FrameIdx = FrameInfo->CreateStackObject(ByteSize, StackAlign);
1061 return getFrameIndex(FrameIdx, TLI.getPointerTy());
1065 SDOperand SelectionDAG::FoldSetCC(MVT VT, SDOperand N1,
1066 SDOperand N2, ISD::CondCode Cond) {
1067 // These setcc operations always fold.
1071 case ISD::SETFALSE2: return getConstant(0, VT);
1073 case ISD::SETTRUE2: return getConstant(1, VT);
1085 assert(!N1.getValueType().isInteger() && "Illegal setcc for integer!");
1089 if (ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.Val)) {
1090 const APInt &C2 = N2C->getAPIntValue();
1091 if (ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.Val)) {
1092 const APInt &C1 = N1C->getAPIntValue();
1095 default: assert(0 && "Unknown integer setcc!");
1096 case ISD::SETEQ: return getConstant(C1 == C2, VT);
1097 case ISD::SETNE: return getConstant(C1 != C2, VT);
1098 case ISD::SETULT: return getConstant(C1.ult(C2), VT);
1099 case ISD::SETUGT: return getConstant(C1.ugt(C2), VT);
1100 case ISD::SETULE: return getConstant(C1.ule(C2), VT);
1101 case ISD::SETUGE: return getConstant(C1.uge(C2), VT);
1102 case ISD::SETLT: return getConstant(C1.slt(C2), VT);
1103 case ISD::SETGT: return getConstant(C1.sgt(C2), VT);
1104 case ISD::SETLE: return getConstant(C1.sle(C2), VT);
1105 case ISD::SETGE: return getConstant(C1.sge(C2), VT);
1109 if (ConstantFPSDNode *N1C = dyn_cast<ConstantFPSDNode>(N1.Val)) {
1110 if (ConstantFPSDNode *N2C = dyn_cast<ConstantFPSDNode>(N2.Val)) {
1111 // No compile time operations on this type yet.
1112 if (N1C->getValueType(0) == MVT::ppcf128)
1115 APFloat::cmpResult R = N1C->getValueAPF().compare(N2C->getValueAPF());
1118 case ISD::SETEQ: if (R==APFloat::cmpUnordered)
1119 return getNode(ISD::UNDEF, VT);
1121 case ISD::SETOEQ: return getConstant(R==APFloat::cmpEqual, VT);
1122 case ISD::SETNE: if (R==APFloat::cmpUnordered)
1123 return getNode(ISD::UNDEF, VT);
1125 case ISD::SETONE: return getConstant(R==APFloat::cmpGreaterThan ||
1126 R==APFloat::cmpLessThan, VT);
1127 case ISD::SETLT: if (R==APFloat::cmpUnordered)
1128 return getNode(ISD::UNDEF, VT);
1130 case ISD::SETOLT: return getConstant(R==APFloat::cmpLessThan, VT);
1131 case ISD::SETGT: if (R==APFloat::cmpUnordered)
1132 return getNode(ISD::UNDEF, VT);
1134 case ISD::SETOGT: return getConstant(R==APFloat::cmpGreaterThan, VT);
1135 case ISD::SETLE: if (R==APFloat::cmpUnordered)
1136 return getNode(ISD::UNDEF, VT);
1138 case ISD::SETOLE: return getConstant(R==APFloat::cmpLessThan ||
1139 R==APFloat::cmpEqual, VT);
1140 case ISD::SETGE: if (R==APFloat::cmpUnordered)
1141 return getNode(ISD::UNDEF, VT);
1143 case ISD::SETOGE: return getConstant(R==APFloat::cmpGreaterThan ||
1144 R==APFloat::cmpEqual, VT);
1145 case ISD::SETO: return getConstant(R!=APFloat::cmpUnordered, VT);
1146 case ISD::SETUO: return getConstant(R==APFloat::cmpUnordered, VT);
1147 case ISD::SETUEQ: return getConstant(R==APFloat::cmpUnordered ||
1148 R==APFloat::cmpEqual, VT);
1149 case ISD::SETUNE: return getConstant(R!=APFloat::cmpEqual, VT);
1150 case ISD::SETULT: return getConstant(R==APFloat::cmpUnordered ||
1151 R==APFloat::cmpLessThan, VT);
1152 case ISD::SETUGT: return getConstant(R==APFloat::cmpGreaterThan ||
1153 R==APFloat::cmpUnordered, VT);
1154 case ISD::SETULE: return getConstant(R!=APFloat::cmpGreaterThan, VT);
1155 case ISD::SETUGE: return getConstant(R!=APFloat::cmpLessThan, VT);
1158 // Ensure that the constant occurs on the RHS.
1159 return getSetCC(VT, N2, N1, ISD::getSetCCSwappedOperands(Cond));
1163 // Could not fold it.
1167 /// SignBitIsZero - Return true if the sign bit of Op is known to be zero. We
1168 /// use this predicate to simplify operations downstream.
1169 bool SelectionDAG::SignBitIsZero(SDOperand Op, unsigned Depth) const {
1170 unsigned BitWidth = Op.getValueSizeInBits();
1171 return MaskedValueIsZero(Op, APInt::getSignBit(BitWidth), Depth);
1174 /// MaskedValueIsZero - Return true if 'V & Mask' is known to be zero. We use
1175 /// this predicate to simplify operations downstream. Mask is known to be zero
1176 /// for bits that V cannot have.
1177 bool SelectionDAG::MaskedValueIsZero(SDOperand Op, const APInt &Mask,
1178 unsigned Depth) const {
1179 APInt KnownZero, KnownOne;
1180 ComputeMaskedBits(Op, Mask, KnownZero, KnownOne, Depth);
1181 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1182 return (KnownZero & Mask) == Mask;
1185 /// ComputeMaskedBits - Determine which of the bits specified in Mask are
1186 /// known to be either zero or one and return them in the KnownZero/KnownOne
1187 /// bitsets. This code only analyzes bits in Mask, in order to short-circuit
1189 void SelectionDAG::ComputeMaskedBits(SDOperand Op, const APInt &Mask,
1190 APInt &KnownZero, APInt &KnownOne,
1191 unsigned Depth) const {
1192 unsigned BitWidth = Mask.getBitWidth();
1193 assert(BitWidth == Op.getValueType().getSizeInBits() &&
1194 "Mask size mismatches value type size!");
1196 KnownZero = KnownOne = APInt(BitWidth, 0); // Don't know anything.
1197 if (Depth == 6 || Mask == 0)
1198 return; // Limit search depth.
1200 APInt KnownZero2, KnownOne2;
1202 switch (Op.getOpcode()) {
1204 // We know all of the bits for a constant!
1205 KnownOne = cast<ConstantSDNode>(Op)->getAPIntValue() & Mask;
1206 KnownZero = ~KnownOne & Mask;
1209 // If either the LHS or the RHS are Zero, the result is zero.
1210 ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero, KnownOne, Depth+1);
1211 ComputeMaskedBits(Op.getOperand(0), Mask & ~KnownZero,
1212 KnownZero2, KnownOne2, Depth+1);
1213 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1214 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1216 // Output known-1 bits are only known if set in both the LHS & RHS.
1217 KnownOne &= KnownOne2;
1218 // Output known-0 are known to be clear if zero in either the LHS | RHS.
1219 KnownZero |= KnownZero2;
1222 ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero, KnownOne, Depth+1);
1223 ComputeMaskedBits(Op.getOperand(0), Mask & ~KnownOne,
1224 KnownZero2, KnownOne2, Depth+1);
1225 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1226 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1228 // Output known-0 bits are only known if clear in both the LHS & RHS.
1229 KnownZero &= KnownZero2;
1230 // Output known-1 are known to be set if set in either the LHS | RHS.
1231 KnownOne |= KnownOne2;
1234 ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero, KnownOne, Depth+1);
1235 ComputeMaskedBits(Op.getOperand(0), Mask, KnownZero2, KnownOne2, Depth+1);
1236 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1237 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1239 // Output known-0 bits are known if clear or set in both the LHS & RHS.
1240 APInt KnownZeroOut = (KnownZero & KnownZero2) | (KnownOne & KnownOne2);
1241 // Output known-1 are known to be set if set in only one of the LHS, RHS.
1242 KnownOne = (KnownZero & KnownOne2) | (KnownOne & KnownZero2);
1243 KnownZero = KnownZeroOut;
1247 APInt Mask2 = APInt::getAllOnesValue(BitWidth);
1248 ComputeMaskedBits(Op.getOperand(1), Mask2, KnownZero, KnownOne, Depth+1);
1249 ComputeMaskedBits(Op.getOperand(0), Mask2, KnownZero2, KnownOne2, Depth+1);
1250 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1251 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1253 // If low bits are zero in either operand, output low known-0 bits.
1254 // Also compute a conserative estimate for high known-0 bits.
1255 // More trickiness is possible, but this is sufficient for the
1256 // interesting case of alignment computation.
1258 unsigned TrailZ = KnownZero.countTrailingOnes() +
1259 KnownZero2.countTrailingOnes();
1260 unsigned LeadZ = std::max(KnownZero.countLeadingOnes() +
1261 KnownZero2.countLeadingOnes(),
1262 BitWidth) - BitWidth;
1264 TrailZ = std::min(TrailZ, BitWidth);
1265 LeadZ = std::min(LeadZ, BitWidth);
1266 KnownZero = APInt::getLowBitsSet(BitWidth, TrailZ) |
1267 APInt::getHighBitsSet(BitWidth, LeadZ);
1272 // For the purposes of computing leading zeros we can conservatively
1273 // treat a udiv as a logical right shift by the power of 2 known to
1274 // be less than the denominator.
1275 APInt AllOnes = APInt::getAllOnesValue(BitWidth);
1276 ComputeMaskedBits(Op.getOperand(0),
1277 AllOnes, KnownZero2, KnownOne2, Depth+1);
1278 unsigned LeadZ = KnownZero2.countLeadingOnes();
1282 ComputeMaskedBits(Op.getOperand(1),
1283 AllOnes, KnownZero2, KnownOne2, Depth+1);
1284 unsigned RHSUnknownLeadingOnes = KnownOne2.countLeadingZeros();
1285 if (RHSUnknownLeadingOnes != BitWidth)
1286 LeadZ = std::min(BitWidth,
1287 LeadZ + BitWidth - RHSUnknownLeadingOnes - 1);
1289 KnownZero = APInt::getHighBitsSet(BitWidth, LeadZ) & Mask;
1293 ComputeMaskedBits(Op.getOperand(2), Mask, KnownZero, KnownOne, Depth+1);
1294 ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero2, KnownOne2, Depth+1);
1295 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1296 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1298 // Only known if known in both the LHS and RHS.
1299 KnownOne &= KnownOne2;
1300 KnownZero &= KnownZero2;
1302 case ISD::SELECT_CC:
1303 ComputeMaskedBits(Op.getOperand(3), Mask, KnownZero, KnownOne, Depth+1);
1304 ComputeMaskedBits(Op.getOperand(2), Mask, KnownZero2, KnownOne2, Depth+1);
1305 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1306 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1308 // Only known if known in both the LHS and RHS.
1309 KnownOne &= KnownOne2;
1310 KnownZero &= KnownZero2;
1313 // If we know the result of a setcc has the top bits zero, use this info.
1314 if (TLI.getSetCCResultContents() == TargetLowering::ZeroOrOneSetCCResult &&
1316 KnownZero |= APInt::getHighBitsSet(BitWidth, BitWidth - 1);
1319 // (shl X, C1) & C2 == 0 iff (X & C2 >>u C1) == 0
1320 if (ConstantSDNode *SA = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
1321 unsigned ShAmt = SA->getValue();
1323 // If the shift count is an invalid immediate, don't do anything.
1324 if (ShAmt >= BitWidth)
1327 ComputeMaskedBits(Op.getOperand(0), Mask.lshr(ShAmt),
1328 KnownZero, KnownOne, Depth+1);
1329 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1330 KnownZero <<= ShAmt;
1332 // low bits known zero.
1333 KnownZero |= APInt::getLowBitsSet(BitWidth, ShAmt);
1337 // (ushr X, C1) & C2 == 0 iff (-1 >> C1) & C2 == 0
1338 if (ConstantSDNode *SA = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
1339 unsigned ShAmt = SA->getValue();
1341 // If the shift count is an invalid immediate, don't do anything.
1342 if (ShAmt >= BitWidth)
1345 ComputeMaskedBits(Op.getOperand(0), (Mask << ShAmt),
1346 KnownZero, KnownOne, Depth+1);
1347 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1348 KnownZero = KnownZero.lshr(ShAmt);
1349 KnownOne = KnownOne.lshr(ShAmt);
1351 APInt HighBits = APInt::getHighBitsSet(BitWidth, ShAmt) & Mask;
1352 KnownZero |= HighBits; // High bits known zero.
1356 if (ConstantSDNode *SA = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
1357 unsigned ShAmt = SA->getValue();
1359 // If the shift count is an invalid immediate, don't do anything.
1360 if (ShAmt >= BitWidth)
1363 APInt InDemandedMask = (Mask << ShAmt);
1364 // If any of the demanded bits are produced by the sign extension, we also
1365 // demand the input sign bit.
1366 APInt HighBits = APInt::getHighBitsSet(BitWidth, ShAmt) & Mask;
1367 if (HighBits.getBoolValue())
1368 InDemandedMask |= APInt::getSignBit(BitWidth);
1370 ComputeMaskedBits(Op.getOperand(0), InDemandedMask, KnownZero, KnownOne,
1372 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1373 KnownZero = KnownZero.lshr(ShAmt);
1374 KnownOne = KnownOne.lshr(ShAmt);
1376 // Handle the sign bits.
1377 APInt SignBit = APInt::getSignBit(BitWidth);
1378 SignBit = SignBit.lshr(ShAmt); // Adjust to where it is now in the mask.
1380 if (KnownZero.intersects(SignBit)) {
1381 KnownZero |= HighBits; // New bits are known zero.
1382 } else if (KnownOne.intersects(SignBit)) {
1383 KnownOne |= HighBits; // New bits are known one.
1387 case ISD::SIGN_EXTEND_INREG: {
1388 MVT EVT = cast<VTSDNode>(Op.getOperand(1))->getVT();
1389 unsigned EBits = EVT.getSizeInBits();
1391 // Sign extension. Compute the demanded bits in the result that are not
1392 // present in the input.
1393 APInt NewBits = APInt::getHighBitsSet(BitWidth, BitWidth - EBits) & Mask;
1395 APInt InSignBit = APInt::getSignBit(EBits);
1396 APInt InputDemandedBits = Mask & APInt::getLowBitsSet(BitWidth, EBits);
1398 // If the sign extended bits are demanded, we know that the sign
1400 InSignBit.zext(BitWidth);
1401 if (NewBits.getBoolValue())
1402 InputDemandedBits |= InSignBit;
1404 ComputeMaskedBits(Op.getOperand(0), InputDemandedBits,
1405 KnownZero, KnownOne, Depth+1);
1406 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1408 // If the sign bit of the input is known set or clear, then we know the
1409 // top bits of the result.
1410 if (KnownZero.intersects(InSignBit)) { // Input sign bit known clear
1411 KnownZero |= NewBits;
1412 KnownOne &= ~NewBits;
1413 } else if (KnownOne.intersects(InSignBit)) { // Input sign bit known set
1414 KnownOne |= NewBits;
1415 KnownZero &= ~NewBits;
1416 } else { // Input sign bit unknown
1417 KnownZero &= ~NewBits;
1418 KnownOne &= ~NewBits;
1425 unsigned LowBits = Log2_32(BitWidth)+1;
1426 KnownZero = APInt::getHighBitsSet(BitWidth, BitWidth - LowBits);
1431 if (ISD::isZEXTLoad(Op.Val)) {
1432 LoadSDNode *LD = cast<LoadSDNode>(Op);
1433 MVT VT = LD->getMemoryVT();
1434 unsigned MemBits = VT.getSizeInBits();
1435 KnownZero |= APInt::getHighBitsSet(BitWidth, BitWidth - MemBits) & Mask;
1439 case ISD::ZERO_EXTEND: {
1440 MVT InVT = Op.getOperand(0).getValueType();
1441 unsigned InBits = InVT.getSizeInBits();
1442 APInt NewBits = APInt::getHighBitsSet(BitWidth, BitWidth - InBits) & Mask;
1443 APInt InMask = Mask;
1444 InMask.trunc(InBits);
1445 KnownZero.trunc(InBits);
1446 KnownOne.trunc(InBits);
1447 ComputeMaskedBits(Op.getOperand(0), InMask, KnownZero, KnownOne, Depth+1);
1448 KnownZero.zext(BitWidth);
1449 KnownOne.zext(BitWidth);
1450 KnownZero |= NewBits;
1453 case ISD::SIGN_EXTEND: {
1454 MVT InVT = Op.getOperand(0).getValueType();
1455 unsigned InBits = InVT.getSizeInBits();
1456 APInt InSignBit = APInt::getSignBit(InBits);
1457 APInt NewBits = APInt::getHighBitsSet(BitWidth, BitWidth - InBits) & Mask;
1458 APInt InMask = Mask;
1459 InMask.trunc(InBits);
1461 // If any of the sign extended bits are demanded, we know that the sign
1462 // bit is demanded. Temporarily set this bit in the mask for our callee.
1463 if (NewBits.getBoolValue())
1464 InMask |= InSignBit;
1466 KnownZero.trunc(InBits);
1467 KnownOne.trunc(InBits);
1468 ComputeMaskedBits(Op.getOperand(0), InMask, KnownZero, KnownOne, Depth+1);
1470 // Note if the sign bit is known to be zero or one.
1471 bool SignBitKnownZero = KnownZero.isNegative();
1472 bool SignBitKnownOne = KnownOne.isNegative();
1473 assert(!(SignBitKnownZero && SignBitKnownOne) &&
1474 "Sign bit can't be known to be both zero and one!");
1476 // If the sign bit wasn't actually demanded by our caller, we don't
1477 // want it set in the KnownZero and KnownOne result values. Reset the
1478 // mask and reapply it to the result values.
1480 InMask.trunc(InBits);
1481 KnownZero &= InMask;
1484 KnownZero.zext(BitWidth);
1485 KnownOne.zext(BitWidth);
1487 // If the sign bit is known zero or one, the top bits match.
1488 if (SignBitKnownZero)
1489 KnownZero |= NewBits;
1490 else if (SignBitKnownOne)
1491 KnownOne |= NewBits;
1494 case ISD::ANY_EXTEND: {
1495 MVT InVT = Op.getOperand(0).getValueType();
1496 unsigned InBits = InVT.getSizeInBits();
1497 APInt InMask = Mask;
1498 InMask.trunc(InBits);
1499 KnownZero.trunc(InBits);
1500 KnownOne.trunc(InBits);
1501 ComputeMaskedBits(Op.getOperand(0), InMask, KnownZero, KnownOne, Depth+1);
1502 KnownZero.zext(BitWidth);
1503 KnownOne.zext(BitWidth);
1506 case ISD::TRUNCATE: {
1507 MVT InVT = Op.getOperand(0).getValueType();
1508 unsigned InBits = InVT.getSizeInBits();
1509 APInt InMask = Mask;
1510 InMask.zext(InBits);
1511 KnownZero.zext(InBits);
1512 KnownOne.zext(InBits);
1513 ComputeMaskedBits(Op.getOperand(0), InMask, KnownZero, KnownOne, Depth+1);
1514 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1515 KnownZero.trunc(BitWidth);
1516 KnownOne.trunc(BitWidth);
1519 case ISD::AssertZext: {
1520 MVT VT = cast<VTSDNode>(Op.getOperand(1))->getVT();
1521 APInt InMask = APInt::getLowBitsSet(BitWidth, VT.getSizeInBits());
1522 ComputeMaskedBits(Op.getOperand(0), Mask & InMask, KnownZero,
1524 KnownZero |= (~InMask) & Mask;
1528 // All bits are zero except the low bit.
1529 KnownZero = APInt::getHighBitsSet(BitWidth, BitWidth - 1);
1533 if (ConstantSDNode *CLHS = dyn_cast<ConstantSDNode>(Op.getOperand(0))) {
1534 // We know that the top bits of C-X are clear if X contains less bits
1535 // than C (i.e. no wrap-around can happen). For example, 20-X is
1536 // positive if we can prove that X is >= 0 and < 16.
1537 if (CLHS->getAPIntValue().isNonNegative()) {
1538 unsigned NLZ = (CLHS->getAPIntValue()+1).countLeadingZeros();
1539 // NLZ can't be BitWidth with no sign bit
1540 APInt MaskV = APInt::getHighBitsSet(BitWidth, NLZ+1);
1541 ComputeMaskedBits(Op.getOperand(1), MaskV, KnownZero2, KnownOne2,
1544 // If all of the MaskV bits are known to be zero, then we know the
1545 // output top bits are zero, because we now know that the output is
1547 if ((KnownZero2 & MaskV) == MaskV) {
1548 unsigned NLZ2 = CLHS->getAPIntValue().countLeadingZeros();
1549 // Top bits known zero.
1550 KnownZero = APInt::getHighBitsSet(BitWidth, NLZ2) & Mask;
1557 // Output known-0 bits are known if clear or set in both the low clear bits
1558 // common to both LHS & RHS. For example, 8+(X<<3) is known to have the
1559 // low 3 bits clear.
1560 APInt Mask2 = APInt::getLowBitsSet(BitWidth, Mask.countTrailingOnes());
1561 ComputeMaskedBits(Op.getOperand(0), Mask2, KnownZero2, KnownOne2, Depth+1);
1562 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1563 unsigned KnownZeroOut = KnownZero2.countTrailingOnes();
1565 ComputeMaskedBits(Op.getOperand(1), Mask2, KnownZero2, KnownOne2, Depth+1);
1566 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1567 KnownZeroOut = std::min(KnownZeroOut,
1568 KnownZero2.countTrailingOnes());
1570 KnownZero |= APInt::getLowBitsSet(BitWidth, KnownZeroOut);
1574 if (ConstantSDNode *Rem = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
1575 APInt RA = Rem->getAPIntValue();
1576 if (RA.isPowerOf2() || (-RA).isPowerOf2()) {
1577 APInt LowBits = RA.isStrictlyPositive() ? (RA - 1) : ~RA;
1578 APInt Mask2 = LowBits | APInt::getSignBit(BitWidth);
1579 ComputeMaskedBits(Op.getOperand(0), Mask2,KnownZero2,KnownOne2,Depth+1);
1581 // The sign of a remainder is equal to the sign of the first
1582 // operand (zero being positive).
1583 if (KnownZero2[BitWidth-1] || ((KnownZero2 & LowBits) == LowBits))
1584 KnownZero2 |= ~LowBits;
1585 else if (KnownOne2[BitWidth-1])
1586 KnownOne2 |= ~LowBits;
1588 KnownZero |= KnownZero2 & Mask;
1589 KnownOne |= KnownOne2 & Mask;
1591 assert((KnownZero & KnownOne) == 0&&"Bits known to be one AND zero?");
1596 if (ConstantSDNode *Rem = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
1597 APInt RA = Rem->getAPIntValue();
1598 if (RA.isPowerOf2()) {
1599 APInt LowBits = (RA - 1);
1600 APInt Mask2 = LowBits & Mask;
1601 KnownZero |= ~LowBits & Mask;
1602 ComputeMaskedBits(Op.getOperand(0), Mask2, KnownZero, KnownOne,Depth+1);
1603 assert((KnownZero & KnownOne) == 0&&"Bits known to be one AND zero?");
1608 // Since the result is less than or equal to either operand, any leading
1609 // zero bits in either operand must also exist in the result.
1610 APInt AllOnes = APInt::getAllOnesValue(BitWidth);
1611 ComputeMaskedBits(Op.getOperand(0), AllOnes, KnownZero, KnownOne,
1613 ComputeMaskedBits(Op.getOperand(1), AllOnes, KnownZero2, KnownOne2,
1616 uint32_t Leaders = std::max(KnownZero.countLeadingOnes(),
1617 KnownZero2.countLeadingOnes());
1619 KnownZero = APInt::getHighBitsSet(BitWidth, Leaders) & Mask;
1623 // Allow the target to implement this method for its nodes.
1624 if (Op.getOpcode() >= ISD::BUILTIN_OP_END) {
1625 case ISD::INTRINSIC_WO_CHAIN:
1626 case ISD::INTRINSIC_W_CHAIN:
1627 case ISD::INTRINSIC_VOID:
1628 TLI.computeMaskedBitsForTargetNode(Op, Mask, KnownZero, KnownOne, *this);
1634 /// ComputeNumSignBits - Return the number of times the sign bit of the
1635 /// register is replicated into the other bits. We know that at least 1 bit
1636 /// is always equal to the sign bit (itself), but other cases can give us
1637 /// information. For example, immediately after an "SRA X, 2", we know that
1638 /// the top 3 bits are all equal to each other, so we return 3.
1639 unsigned SelectionDAG::ComputeNumSignBits(SDOperand Op, unsigned Depth) const{
1640 MVT VT = Op.getValueType();
1641 assert(VT.isInteger() && "Invalid VT!");
1642 unsigned VTBits = VT.getSizeInBits();
1644 unsigned FirstAnswer = 1;
1647 return 1; // Limit search depth.
1649 switch (Op.getOpcode()) {
1651 case ISD::AssertSext:
1652 Tmp = cast<VTSDNode>(Op.getOperand(1))->getVT().getSizeInBits();
1653 return VTBits-Tmp+1;
1654 case ISD::AssertZext:
1655 Tmp = cast<VTSDNode>(Op.getOperand(1))->getVT().getSizeInBits();
1658 case ISD::Constant: {
1659 const APInt &Val = cast<ConstantSDNode>(Op)->getAPIntValue();
1660 // If negative, return # leading ones.
1661 if (Val.isNegative())
1662 return Val.countLeadingOnes();
1664 // Return # leading zeros.
1665 return Val.countLeadingZeros();
1668 case ISD::SIGN_EXTEND:
1669 Tmp = VTBits-Op.getOperand(0).getValueType().getSizeInBits();
1670 return ComputeNumSignBits(Op.getOperand(0), Depth+1) + Tmp;
1672 case ISD::SIGN_EXTEND_INREG:
1673 // Max of the input and what this extends.
1674 Tmp = cast<VTSDNode>(Op.getOperand(1))->getVT().getSizeInBits();
1677 Tmp2 = ComputeNumSignBits(Op.getOperand(0), Depth+1);
1678 return std::max(Tmp, Tmp2);
1681 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
1682 // SRA X, C -> adds C sign bits.
1683 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
1684 Tmp += C->getValue();
1685 if (Tmp > VTBits) Tmp = VTBits;
1689 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
1690 // shl destroys sign bits.
1691 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
1692 if (C->getValue() >= VTBits || // Bad shift.
1693 C->getValue() >= Tmp) break; // Shifted all sign bits out.
1694 return Tmp - C->getValue();
1699 case ISD::XOR: // NOT is handled here.
1700 // Logical binary ops preserve the number of sign bits at the worst.
1701 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
1703 Tmp2 = ComputeNumSignBits(Op.getOperand(1), Depth+1);
1704 FirstAnswer = std::min(Tmp, Tmp2);
1705 // We computed what we know about the sign bits as our first
1706 // answer. Now proceed to the generic code that uses
1707 // ComputeMaskedBits, and pick whichever answer is better.
1712 Tmp = ComputeNumSignBits(Op.getOperand(1), Depth+1);
1713 if (Tmp == 1) return 1; // Early out.
1714 Tmp2 = ComputeNumSignBits(Op.getOperand(2), Depth+1);
1715 return std::min(Tmp, Tmp2);
1718 // If setcc returns 0/-1, all bits are sign bits.
1719 if (TLI.getSetCCResultContents() ==
1720 TargetLowering::ZeroOrNegativeOneSetCCResult)
1725 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
1726 unsigned RotAmt = C->getValue() & (VTBits-1);
1728 // Handle rotate right by N like a rotate left by 32-N.
1729 if (Op.getOpcode() == ISD::ROTR)
1730 RotAmt = (VTBits-RotAmt) & (VTBits-1);
1732 // If we aren't rotating out all of the known-in sign bits, return the
1733 // number that are left. This handles rotl(sext(x), 1) for example.
1734 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
1735 if (Tmp > RotAmt+1) return Tmp-RotAmt;
1739 // Add can have at most one carry bit. Thus we know that the output
1740 // is, at worst, one more bit than the inputs.
1741 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
1742 if (Tmp == 1) return 1; // Early out.
1744 // Special case decrementing a value (ADD X, -1):
1745 if (ConstantSDNode *CRHS = dyn_cast<ConstantSDNode>(Op.getOperand(0)))
1746 if (CRHS->isAllOnesValue()) {
1747 APInt KnownZero, KnownOne;
1748 APInt Mask = APInt::getAllOnesValue(VTBits);
1749 ComputeMaskedBits(Op.getOperand(0), Mask, KnownZero, KnownOne, Depth+1);
1751 // If the input is known to be 0 or 1, the output is 0/-1, which is all
1753 if ((KnownZero | APInt(VTBits, 1)) == Mask)
1756 // If we are subtracting one from a positive number, there is no carry
1757 // out of the result.
1758 if (KnownZero.isNegative())
1762 Tmp2 = ComputeNumSignBits(Op.getOperand(1), Depth+1);
1763 if (Tmp2 == 1) return 1;
1764 return std::min(Tmp, Tmp2)-1;
1768 Tmp2 = ComputeNumSignBits(Op.getOperand(1), Depth+1);
1769 if (Tmp2 == 1) return 1;
1772 if (ConstantSDNode *CLHS = dyn_cast<ConstantSDNode>(Op.getOperand(0)))
1773 if (CLHS->isNullValue()) {
1774 APInt KnownZero, KnownOne;
1775 APInt Mask = APInt::getAllOnesValue(VTBits);
1776 ComputeMaskedBits(Op.getOperand(1), Mask, KnownZero, KnownOne, Depth+1);
1777 // If the input is known to be 0 or 1, the output is 0/-1, which is all
1779 if ((KnownZero | APInt(VTBits, 1)) == Mask)
1782 // If the input is known to be positive (the sign bit is known clear),
1783 // the output of the NEG has the same number of sign bits as the input.
1784 if (KnownZero.isNegative())
1787 // Otherwise, we treat this like a SUB.
1790 // Sub can have at most one carry bit. Thus we know that the output
1791 // is, at worst, one more bit than the inputs.
1792 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
1793 if (Tmp == 1) return 1; // Early out.
1794 return std::min(Tmp, Tmp2)-1;
1797 // FIXME: it's tricky to do anything useful for this, but it is an important
1798 // case for targets like X86.
1802 // Handle LOADX separately here. EXTLOAD case will fallthrough.
1803 if (Op.getOpcode() == ISD::LOAD) {
1804 LoadSDNode *LD = cast<LoadSDNode>(Op);
1805 unsigned ExtType = LD->getExtensionType();
1808 case ISD::SEXTLOAD: // '17' bits known
1809 Tmp = LD->getMemoryVT().getSizeInBits();
1810 return VTBits-Tmp+1;
1811 case ISD::ZEXTLOAD: // '16' bits known
1812 Tmp = LD->getMemoryVT().getSizeInBits();
1817 // Allow the target to implement this method for its nodes.
1818 if (Op.getOpcode() >= ISD::BUILTIN_OP_END ||
1819 Op.getOpcode() == ISD::INTRINSIC_WO_CHAIN ||
1820 Op.getOpcode() == ISD::INTRINSIC_W_CHAIN ||
1821 Op.getOpcode() == ISD::INTRINSIC_VOID) {
1822 unsigned NumBits = TLI.ComputeNumSignBitsForTargetNode(Op, Depth);
1823 if (NumBits > 1) FirstAnswer = std::max(FirstAnswer, NumBits);
1826 // Finally, if we can prove that the top bits of the result are 0's or 1's,
1827 // use this information.
1828 APInt KnownZero, KnownOne;
1829 APInt Mask = APInt::getAllOnesValue(VTBits);
1830 ComputeMaskedBits(Op, Mask, KnownZero, KnownOne, Depth);
1832 if (KnownZero.isNegative()) { // sign bit is 0
1834 } else if (KnownOne.isNegative()) { // sign bit is 1;
1841 // Okay, we know that the sign bit in Mask is set. Use CLZ to determine
1842 // the number of identical bits in the top of the input value.
1844 Mask <<= Mask.getBitWidth()-VTBits;
1845 // Return # leading zeros. We use 'min' here in case Val was zero before
1846 // shifting. We don't want to return '64' as for an i32 "0".
1847 return std::max(FirstAnswer, std::min(VTBits, Mask.countLeadingZeros()));
1851 bool SelectionDAG::isVerifiedDebugInfoDesc(SDOperand Op) const {
1852 GlobalAddressSDNode *GA = dyn_cast<GlobalAddressSDNode>(Op);
1853 if (!GA) return false;
1854 GlobalVariable *GV = dyn_cast<GlobalVariable>(GA->getGlobal());
1855 if (!GV) return false;
1856 MachineModuleInfo *MMI = getMachineModuleInfo();
1857 return MMI && MMI->hasDebugInfo() && MMI->isVerified(GV);
1861 /// getShuffleScalarElt - Returns the scalar element that will make up the ith
1862 /// element of the result of the vector shuffle.
1863 SDOperand SelectionDAG::getShuffleScalarElt(const SDNode *N, unsigned i) {
1864 MVT VT = N->getValueType(0);
1865 SDOperand PermMask = N->getOperand(2);
1866 SDOperand Idx = PermMask.getOperand(i);
1867 if (Idx.getOpcode() == ISD::UNDEF)
1868 return getNode(ISD::UNDEF, VT.getVectorElementType());
1869 unsigned Index = cast<ConstantSDNode>(Idx)->getValue();
1870 unsigned NumElems = PermMask.getNumOperands();
1871 SDOperand V = (Index < NumElems) ? N->getOperand(0) : N->getOperand(1);
1874 if (V.getOpcode() == ISD::BIT_CONVERT) {
1875 V = V.getOperand(0);
1876 if (V.getValueType().getVectorNumElements() != NumElems)
1879 if (V.getOpcode() == ISD::SCALAR_TO_VECTOR)
1880 return (Index == 0) ? V.getOperand(0)
1881 : getNode(ISD::UNDEF, VT.getVectorElementType());
1882 if (V.getOpcode() == ISD::BUILD_VECTOR)
1883 return V.getOperand(Index);
1884 if (V.getOpcode() == ISD::VECTOR_SHUFFLE)
1885 return getShuffleScalarElt(V.Val, Index);
1890 /// getNode - Gets or creates the specified node.
1892 SDOperand SelectionDAG::getNode(unsigned Opcode, MVT VT) {
1893 FoldingSetNodeID ID;
1894 AddNodeIDNode(ID, Opcode, getVTList(VT), (SDOperand*)0, 0);
1896 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1897 return SDOperand(E, 0);
1898 SDNode *N = new SDNode(Opcode, SDNode::getSDVTList(VT));
1899 CSEMap.InsertNode(N, IP);
1901 AllNodes.push_back(N);
1902 return SDOperand(N, 0);
1905 SDOperand SelectionDAG::getNode(unsigned Opcode, MVT VT, SDOperand Operand) {
1906 // Constant fold unary operations with an integer constant operand.
1907 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Operand.Val)) {
1908 const APInt &Val = C->getAPIntValue();
1909 unsigned BitWidth = VT.getSizeInBits();
1912 case ISD::SIGN_EXTEND:
1913 return getConstant(APInt(Val).sextOrTrunc(BitWidth), VT);
1914 case ISD::ANY_EXTEND:
1915 case ISD::ZERO_EXTEND:
1917 return getConstant(APInt(Val).zextOrTrunc(BitWidth), VT);
1918 case ISD::UINT_TO_FP:
1919 case ISD::SINT_TO_FP: {
1920 const uint64_t zero[] = {0, 0};
1921 // No compile time operations on this type.
1922 if (VT==MVT::ppcf128)
1924 APFloat apf = APFloat(APInt(BitWidth, 2, zero));
1925 (void)apf.convertFromAPInt(Val,
1926 Opcode==ISD::SINT_TO_FP,
1927 APFloat::rmNearestTiesToEven);
1928 return getConstantFP(apf, VT);
1930 case ISD::BIT_CONVERT:
1931 if (VT == MVT::f32 && C->getValueType(0) == MVT::i32)
1932 return getConstantFP(Val.bitsToFloat(), VT);
1933 else if (VT == MVT::f64 && C->getValueType(0) == MVT::i64)
1934 return getConstantFP(Val.bitsToDouble(), VT);
1937 return getConstant(Val.byteSwap(), VT);
1939 return getConstant(Val.countPopulation(), VT);
1941 return getConstant(Val.countLeadingZeros(), VT);
1943 return getConstant(Val.countTrailingZeros(), VT);
1947 // Constant fold unary operations with a floating point constant operand.
1948 if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(Operand.Val)) {
1949 APFloat V = C->getValueAPF(); // make copy
1950 if (VT != MVT::ppcf128 && Operand.getValueType() != MVT::ppcf128) {
1954 return getConstantFP(V, VT);
1957 return getConstantFP(V, VT);
1959 case ISD::FP_EXTEND:
1960 // This can return overflow, underflow, or inexact; we don't care.
1961 // FIXME need to be more flexible about rounding mode.
1962 (void)V.convert(*MVTToAPFloatSemantics(VT),
1963 APFloat::rmNearestTiesToEven);
1964 return getConstantFP(V, VT);
1965 case ISD::FP_TO_SINT:
1966 case ISD::FP_TO_UINT: {
1968 assert(integerPartWidth >= 64);
1969 // FIXME need to be more flexible about rounding mode.
1970 APFloat::opStatus s = V.convertToInteger(&x, 64U,
1971 Opcode==ISD::FP_TO_SINT,
1972 APFloat::rmTowardZero);
1973 if (s==APFloat::opInvalidOp) // inexact is OK, in fact usual
1975 return getConstant(x, VT);
1977 case ISD::BIT_CONVERT:
1978 if (VT == MVT::i32 && C->getValueType(0) == MVT::f32)
1979 return getConstant((uint32_t)V.convertToAPInt().getZExtValue(), VT);
1980 else if (VT == MVT::i64 && C->getValueType(0) == MVT::f64)
1981 return getConstant(V.convertToAPInt().getZExtValue(), VT);
1987 unsigned OpOpcode = Operand.Val->getOpcode();
1989 case ISD::TokenFactor:
1990 case ISD::MERGE_VALUES:
1991 return Operand; // Factor or merge of one node? No need.
1992 case ISD::FP_ROUND: assert(0 && "Invalid method to make FP_ROUND node");
1993 case ISD::FP_EXTEND:
1994 assert(VT.isFloatingPoint() &&
1995 Operand.getValueType().isFloatingPoint() && "Invalid FP cast!");
1996 if (Operand.getValueType() == VT) return Operand; // noop conversion.
1997 if (Operand.getOpcode() == ISD::UNDEF)
1998 return getNode(ISD::UNDEF, VT);
2000 case ISD::SIGN_EXTEND:
2001 assert(VT.isInteger() && Operand.getValueType().isInteger() &&
2002 "Invalid SIGN_EXTEND!");
2003 if (Operand.getValueType() == VT) return Operand; // noop extension
2004 assert(Operand.getValueType().bitsLT(VT)
2005 && "Invalid sext node, dst < src!");
2006 if (OpOpcode == ISD::SIGN_EXTEND || OpOpcode == ISD::ZERO_EXTEND)
2007 return getNode(OpOpcode, VT, Operand.Val->getOperand(0));
2009 case ISD::ZERO_EXTEND:
2010 assert(VT.isInteger() && Operand.getValueType().isInteger() &&
2011 "Invalid ZERO_EXTEND!");
2012 if (Operand.getValueType() == VT) return Operand; // noop extension
2013 assert(Operand.getValueType().bitsLT(VT)
2014 && "Invalid zext node, dst < src!");
2015 if (OpOpcode == ISD::ZERO_EXTEND) // (zext (zext x)) -> (zext x)
2016 return getNode(ISD::ZERO_EXTEND, VT, Operand.Val->getOperand(0));
2018 case ISD::ANY_EXTEND:
2019 assert(VT.isInteger() && Operand.getValueType().isInteger() &&
2020 "Invalid ANY_EXTEND!");
2021 if (Operand.getValueType() == VT) return Operand; // noop extension
2022 assert(Operand.getValueType().bitsLT(VT)
2023 && "Invalid anyext node, dst < src!");
2024 if (OpOpcode == ISD::ZERO_EXTEND || OpOpcode == ISD::SIGN_EXTEND)
2025 // (ext (zext x)) -> (zext x) and (ext (sext x)) -> (sext x)
2026 return getNode(OpOpcode, VT, Operand.Val->getOperand(0));
2029 assert(VT.isInteger() && Operand.getValueType().isInteger() &&
2030 "Invalid TRUNCATE!");
2031 if (Operand.getValueType() == VT) return Operand; // noop truncate
2032 assert(Operand.getValueType().bitsGT(VT)
2033 && "Invalid truncate node, src < dst!");
2034 if (OpOpcode == ISD::TRUNCATE)
2035 return getNode(ISD::TRUNCATE, VT, Operand.Val->getOperand(0));
2036 else if (OpOpcode == ISD::ZERO_EXTEND || OpOpcode == ISD::SIGN_EXTEND ||
2037 OpOpcode == ISD::ANY_EXTEND) {
2038 // If the source is smaller than the dest, we still need an extend.
2039 if (Operand.Val->getOperand(0).getValueType().bitsLT(VT))
2040 return getNode(OpOpcode, VT, Operand.Val->getOperand(0));
2041 else if (Operand.Val->getOperand(0).getValueType().bitsGT(VT))
2042 return getNode(ISD::TRUNCATE, VT, Operand.Val->getOperand(0));
2044 return Operand.Val->getOperand(0);
2047 case ISD::BIT_CONVERT:
2048 // Basic sanity checking.
2049 assert(VT.getSizeInBits() == Operand.getValueType().getSizeInBits()
2050 && "Cannot BIT_CONVERT between types of different sizes!");
2051 if (VT == Operand.getValueType()) return Operand; // noop conversion.
2052 if (OpOpcode == ISD::BIT_CONVERT) // bitconv(bitconv(x)) -> bitconv(x)
2053 return getNode(ISD::BIT_CONVERT, VT, Operand.getOperand(0));
2054 if (OpOpcode == ISD::UNDEF)
2055 return getNode(ISD::UNDEF, VT);
2057 case ISD::SCALAR_TO_VECTOR:
2058 assert(VT.isVector() && !Operand.getValueType().isVector() &&
2059 VT.getVectorElementType() == Operand.getValueType() &&
2060 "Illegal SCALAR_TO_VECTOR node!");
2061 if (OpOpcode == ISD::UNDEF)
2062 return getNode(ISD::UNDEF, VT);
2063 // scalar_to_vector(extract_vector_elt V, 0) -> V, top bits are undefined.
2064 if (OpOpcode == ISD::EXTRACT_VECTOR_ELT &&
2065 isa<ConstantSDNode>(Operand.getOperand(1)) &&
2066 Operand.getConstantOperandVal(1) == 0 &&
2067 Operand.getOperand(0).getValueType() == VT)
2068 return Operand.getOperand(0);
2071 if (OpOpcode == ISD::FSUB) // -(X-Y) -> (Y-X)
2072 return getNode(ISD::FSUB, VT, Operand.Val->getOperand(1),
2073 Operand.Val->getOperand(0));
2074 if (OpOpcode == ISD::FNEG) // --X -> X
2075 return Operand.Val->getOperand(0);
2078 if (OpOpcode == ISD::FNEG) // abs(-X) -> abs(X)
2079 return getNode(ISD::FABS, VT, Operand.Val->getOperand(0));
2084 SDVTList VTs = getVTList(VT);
2085 if (VT != MVT::Flag) { // Don't CSE flag producing nodes
2086 FoldingSetNodeID ID;
2087 SDOperand Ops[1] = { Operand };
2088 AddNodeIDNode(ID, Opcode, VTs, Ops, 1);
2090 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
2091 return SDOperand(E, 0);
2092 N = new UnarySDNode(Opcode, VTs, Operand);
2093 CSEMap.InsertNode(N, IP);
2095 N = new UnarySDNode(Opcode, VTs, Operand);
2097 AllNodes.push_back(N);
2098 return SDOperand(N, 0);
2103 SDOperand SelectionDAG::getNode(unsigned Opcode, MVT VT,
2104 SDOperand N1, SDOperand N2) {
2105 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.Val);
2106 ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.Val);
2109 case ISD::TokenFactor:
2110 assert(VT == MVT::Other && N1.getValueType() == MVT::Other &&
2111 N2.getValueType() == MVT::Other && "Invalid token factor!");
2112 // Fold trivial token factors.
2113 if (N1.getOpcode() == ISD::EntryToken) return N2;
2114 if (N2.getOpcode() == ISD::EntryToken) return N1;
2117 assert(VT.isInteger() && N1.getValueType() == N2.getValueType() &&
2118 N1.getValueType() == VT && "Binary operator types must match!");
2119 // (X & 0) -> 0. This commonly occurs when legalizing i64 values, so it's
2120 // worth handling here.
2121 if (N2C && N2C->isNullValue())
2123 if (N2C && N2C->isAllOnesValue()) // X & -1 -> X
2130 assert(VT.isInteger() && N1.getValueType() == N2.getValueType() &&
2131 N1.getValueType() == VT && "Binary operator types must match!");
2132 // (X ^|+- 0) -> X. This commonly occurs when legalizing i64 values, so
2133 // it's worth handling here.
2134 if (N2C && N2C->isNullValue())
2141 assert(VT.isInteger() && "This operator does not apply to FP types!");
2151 assert(N1.getValueType() == N2.getValueType() &&
2152 N1.getValueType() == VT && "Binary operator types must match!");
2154 case ISD::FCOPYSIGN: // N1 and result must match. N1/N2 need not match.
2155 assert(N1.getValueType() == VT &&
2156 N1.getValueType().isFloatingPoint() &&
2157 N2.getValueType().isFloatingPoint() &&
2158 "Invalid FCOPYSIGN!");
2165 assert(VT == N1.getValueType() &&
2166 "Shift operators return type must be the same as their first arg");
2167 assert(VT.isInteger() && N2.getValueType().isInteger() &&
2168 VT != MVT::i1 && "Shifts only work on integers");
2170 case ISD::FP_ROUND_INREG: {
2171 MVT EVT = cast<VTSDNode>(N2)->getVT();
2172 assert(VT == N1.getValueType() && "Not an inreg round!");
2173 assert(VT.isFloatingPoint() && EVT.isFloatingPoint() &&
2174 "Cannot FP_ROUND_INREG integer types");
2175 assert(EVT.bitsLE(VT) && "Not rounding down!");
2176 if (cast<VTSDNode>(N2)->getVT() == VT) return N1; // Not actually rounding.
2180 assert(VT.isFloatingPoint() &&
2181 N1.getValueType().isFloatingPoint() &&
2182 VT.bitsLE(N1.getValueType()) &&
2183 isa<ConstantSDNode>(N2) && "Invalid FP_ROUND!");
2184 if (N1.getValueType() == VT) return N1; // noop conversion.
2186 case ISD::AssertSext:
2187 case ISD::AssertZext: {
2188 MVT EVT = cast<VTSDNode>(N2)->getVT();
2189 assert(VT == N1.getValueType() && "Not an inreg extend!");
2190 assert(VT.isInteger() && EVT.isInteger() &&
2191 "Cannot *_EXTEND_INREG FP types");
2192 assert(EVT.bitsLE(VT) && "Not extending!");
2193 if (VT == EVT) return N1; // noop assertion.
2196 case ISD::SIGN_EXTEND_INREG: {
2197 MVT EVT = cast<VTSDNode>(N2)->getVT();
2198 assert(VT == N1.getValueType() && "Not an inreg extend!");
2199 assert(VT.isInteger() && EVT.isInteger() &&
2200 "Cannot *_EXTEND_INREG FP types");
2201 assert(EVT.bitsLE(VT) && "Not extending!");
2202 if (EVT == VT) return N1; // Not actually extending
2205 APInt Val = N1C->getAPIntValue();
2206 unsigned FromBits = cast<VTSDNode>(N2)->getVT().getSizeInBits();
2207 Val <<= Val.getBitWidth()-FromBits;
2208 Val = Val.ashr(Val.getBitWidth()-FromBits);
2209 return getConstant(Val, VT);
2213 case ISD::EXTRACT_VECTOR_ELT:
2214 assert(N2C && "Bad EXTRACT_VECTOR_ELT!");
2216 // EXTRACT_VECTOR_ELT of an UNDEF is an UNDEF.
2217 if (N1.getOpcode() == ISD::UNDEF)
2218 return getNode(ISD::UNDEF, VT);
2220 // EXTRACT_VECTOR_ELT of CONCAT_VECTORS is often formed while lowering is
2221 // expanding copies of large vectors from registers.
2222 if (N1.getOpcode() == ISD::CONCAT_VECTORS &&
2223 N1.getNumOperands() > 0) {
2225 N1.getOperand(0).getValueType().getVectorNumElements();
2226 return getNode(ISD::EXTRACT_VECTOR_ELT, VT,
2227 N1.getOperand(N2C->getValue() / Factor),
2228 getConstant(N2C->getValue() % Factor, N2.getValueType()));
2231 // EXTRACT_VECTOR_ELT of BUILD_VECTOR is often formed while lowering is
2232 // expanding large vector constants.
2233 if (N1.getOpcode() == ISD::BUILD_VECTOR)
2234 return N1.getOperand(N2C->getValue());
2236 // EXTRACT_VECTOR_ELT of INSERT_VECTOR_ELT is often formed when vector
2237 // operations are lowered to scalars.
2238 if (N1.getOpcode() == ISD::INSERT_VECTOR_ELT)
2239 if (ConstantSDNode *IEC = dyn_cast<ConstantSDNode>(N1.getOperand(2))) {
2241 return N1.getOperand(1);
2243 return getNode(ISD::EXTRACT_VECTOR_ELT, VT, N1.getOperand(0), N2);
2246 case ISD::EXTRACT_ELEMENT:
2247 assert(N2C && (unsigned)N2C->getValue() < 2 && "Bad EXTRACT_ELEMENT!");
2248 assert(!N1.getValueType().isVector() && !VT.isVector() &&
2249 (N1.getValueType().isInteger() == VT.isInteger()) &&
2250 "Wrong types for EXTRACT_ELEMENT!");
2252 // EXTRACT_ELEMENT of BUILD_PAIR is often formed while legalize is expanding
2253 // 64-bit integers into 32-bit parts. Instead of building the extract of
2254 // the BUILD_PAIR, only to have legalize rip it apart, just do it now.
2255 if (N1.getOpcode() == ISD::BUILD_PAIR)
2256 return N1.getOperand(N2C->getValue());
2258 // EXTRACT_ELEMENT of a constant int is also very common.
2259 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N1)) {
2260 unsigned ElementSize = VT.getSizeInBits();
2261 unsigned Shift = ElementSize * N2C->getValue();
2262 APInt ShiftedVal = C->getAPIntValue().lshr(Shift);
2263 return getConstant(ShiftedVal.trunc(ElementSize), VT);
2266 case ISD::EXTRACT_SUBVECTOR:
2267 if (N1.getValueType() == VT) // Trivial extraction.
2274 APInt C1 = N1C->getAPIntValue(), C2 = N2C->getAPIntValue();
2276 case ISD::ADD: return getConstant(C1 + C2, VT);
2277 case ISD::SUB: return getConstant(C1 - C2, VT);
2278 case ISD::MUL: return getConstant(C1 * C2, VT);
2280 if (C2.getBoolValue()) return getConstant(C1.udiv(C2), VT);
2283 if (C2.getBoolValue()) return getConstant(C1.urem(C2), VT);
2286 if (C2.getBoolValue()) return getConstant(C1.sdiv(C2), VT);
2289 if (C2.getBoolValue()) return getConstant(C1.srem(C2), VT);
2291 case ISD::AND : return getConstant(C1 & C2, VT);
2292 case ISD::OR : return getConstant(C1 | C2, VT);
2293 case ISD::XOR : return getConstant(C1 ^ C2, VT);
2294 case ISD::SHL : return getConstant(C1 << C2, VT);
2295 case ISD::SRL : return getConstant(C1.lshr(C2), VT);
2296 case ISD::SRA : return getConstant(C1.ashr(C2), VT);
2297 case ISD::ROTL : return getConstant(C1.rotl(C2), VT);
2298 case ISD::ROTR : return getConstant(C1.rotr(C2), VT);
2301 } else { // Cannonicalize constant to RHS if commutative
2302 if (isCommutativeBinOp(Opcode)) {
2303 std::swap(N1C, N2C);
2309 // Constant fold FP operations.
2310 ConstantFPSDNode *N1CFP = dyn_cast<ConstantFPSDNode>(N1.Val);
2311 ConstantFPSDNode *N2CFP = dyn_cast<ConstantFPSDNode>(N2.Val);
2313 if (!N2CFP && isCommutativeBinOp(Opcode)) {
2314 // Cannonicalize constant to RHS if commutative
2315 std::swap(N1CFP, N2CFP);
2317 } else if (N2CFP && VT != MVT::ppcf128) {
2318 APFloat V1 = N1CFP->getValueAPF(), V2 = N2CFP->getValueAPF();
2319 APFloat::opStatus s;
2322 s = V1.add(V2, APFloat::rmNearestTiesToEven);
2323 if (s != APFloat::opInvalidOp)
2324 return getConstantFP(V1, VT);
2327 s = V1.subtract(V2, APFloat::rmNearestTiesToEven);
2328 if (s!=APFloat::opInvalidOp)
2329 return getConstantFP(V1, VT);
2332 s = V1.multiply(V2, APFloat::rmNearestTiesToEven);
2333 if (s!=APFloat::opInvalidOp)
2334 return getConstantFP(V1, VT);
2337 s = V1.divide(V2, APFloat::rmNearestTiesToEven);
2338 if (s!=APFloat::opInvalidOp && s!=APFloat::opDivByZero)
2339 return getConstantFP(V1, VT);
2342 s = V1.mod(V2, APFloat::rmNearestTiesToEven);
2343 if (s!=APFloat::opInvalidOp && s!=APFloat::opDivByZero)
2344 return getConstantFP(V1, VT);
2346 case ISD::FCOPYSIGN:
2348 return getConstantFP(V1, VT);
2354 // Canonicalize an UNDEF to the RHS, even over a constant.
2355 if (N1.getOpcode() == ISD::UNDEF) {
2356 if (isCommutativeBinOp(Opcode)) {
2360 case ISD::FP_ROUND_INREG:
2361 case ISD::SIGN_EXTEND_INREG:
2367 return N1; // fold op(undef, arg2) -> undef
2375 return getConstant(0, VT); // fold op(undef, arg2) -> 0
2376 // For vectors, we can't easily build an all zero vector, just return
2383 // Fold a bunch of operators when the RHS is undef.
2384 if (N2.getOpcode() == ISD::UNDEF) {
2387 if (N1.getOpcode() == ISD::UNDEF)
2388 // Handle undef ^ undef -> 0 special case. This is a common
2390 return getConstant(0, VT);
2405 return N2; // fold op(arg1, undef) -> undef
2411 return getConstant(0, VT); // fold op(arg1, undef) -> 0
2412 // For vectors, we can't easily build an all zero vector, just return
2417 return getConstant(VT.getIntegerVTBitMask(), VT);
2418 // For vectors, we can't easily build an all one vector, just return
2426 // Memoize this node if possible.
2428 SDVTList VTs = getVTList(VT);
2429 if (VT != MVT::Flag) {
2430 SDOperand Ops[] = { N1, N2 };
2431 FoldingSetNodeID ID;
2432 AddNodeIDNode(ID, Opcode, VTs, Ops, 2);
2434 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
2435 return SDOperand(E, 0);
2436 N = new BinarySDNode(Opcode, VTs, N1, N2);
2437 CSEMap.InsertNode(N, IP);
2439 N = new BinarySDNode(Opcode, VTs, N1, N2);
2442 AllNodes.push_back(N);
2443 return SDOperand(N, 0);
2446 SDOperand SelectionDAG::getNode(unsigned Opcode, MVT VT,
2447 SDOperand N1, SDOperand N2, SDOperand N3) {
2448 // Perform various simplifications.
2449 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.Val);
2450 ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.Val);
2453 // Use FoldSetCC to simplify SETCC's.
2454 SDOperand Simp = FoldSetCC(VT, N1, N2, cast<CondCodeSDNode>(N3)->get());
2455 if (Simp.Val) return Simp;
2460 if (N1C->getValue())
2461 return N2; // select true, X, Y -> X
2463 return N3; // select false, X, Y -> Y
2466 if (N2 == N3) return N2; // select C, X, X -> X
2470 if (N2C->getValue()) // Unconditional branch
2471 return getNode(ISD::BR, MVT::Other, N1, N3);
2473 return N1; // Never-taken branch
2476 case ISD::VECTOR_SHUFFLE:
2477 assert(VT == N1.getValueType() && VT == N2.getValueType() &&
2478 VT.isVector() && N3.getValueType().isVector() &&
2479 N3.getOpcode() == ISD::BUILD_VECTOR &&
2480 VT.getVectorNumElements() == N3.getNumOperands() &&
2481 "Illegal VECTOR_SHUFFLE node!");
2483 case ISD::BIT_CONVERT:
2484 // Fold bit_convert nodes from a type to themselves.
2485 if (N1.getValueType() == VT)
2490 // Memoize node if it doesn't produce a flag.
2492 SDVTList VTs = getVTList(VT);
2493 if (VT != MVT::Flag) {
2494 SDOperand Ops[] = { N1, N2, N3 };
2495 FoldingSetNodeID ID;
2496 AddNodeIDNode(ID, Opcode, VTs, Ops, 3);
2498 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
2499 return SDOperand(E, 0);
2500 N = new TernarySDNode(Opcode, VTs, N1, N2, N3);
2501 CSEMap.InsertNode(N, IP);
2503 N = new TernarySDNode(Opcode, VTs, N1, N2, N3);
2505 AllNodes.push_back(N);
2506 return SDOperand(N, 0);
2509 SDOperand SelectionDAG::getNode(unsigned Opcode, MVT VT,
2510 SDOperand N1, SDOperand N2, SDOperand N3,
2512 SDOperand Ops[] = { N1, N2, N3, N4 };
2513 return getNode(Opcode, VT, Ops, 4);
2516 SDOperand SelectionDAG::getNode(unsigned Opcode, MVT VT,
2517 SDOperand N1, SDOperand N2, SDOperand N3,
2518 SDOperand N4, SDOperand N5) {
2519 SDOperand Ops[] = { N1, N2, N3, N4, N5 };
2520 return getNode(Opcode, VT, Ops, 5);
2523 /// getMemsetValue - Vectorized representation of the memset value
2525 static SDOperand getMemsetValue(SDOperand Value, MVT VT, SelectionDAG &DAG) {
2526 unsigned NumBits = VT.isVector() ?
2527 VT.getVectorElementType().getSizeInBits() : VT.getSizeInBits();
2528 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Value)) {
2529 APInt Val = APInt(NumBits, C->getValue() & 255);
2531 for (unsigned i = NumBits; i > 8; i >>= 1) {
2532 Val = (Val << Shift) | Val;
2536 return DAG.getConstant(Val, VT);
2537 return DAG.getConstantFP(APFloat(Val), VT);
2540 Value = DAG.getNode(ISD::ZERO_EXTEND, VT, Value);
2542 for (unsigned i = NumBits; i > 8; i >>= 1) {
2543 Value = DAG.getNode(ISD::OR, VT,
2544 DAG.getNode(ISD::SHL, VT, Value,
2545 DAG.getConstant(Shift, MVT::i8)), Value);
2552 /// getMemsetStringVal - Similar to getMemsetValue. Except this is only
2553 /// used when a memcpy is turned into a memset when the source is a constant
2555 static SDOperand getMemsetStringVal(MVT VT, SelectionDAG &DAG,
2556 const TargetLowering &TLI,
2557 std::string &Str, unsigned Offset) {
2558 assert(!VT.isVector() && "Can't handle vector type here!");
2559 unsigned NumBits = VT.getSizeInBits();
2560 unsigned MSB = NumBits / 8;
2562 if (TLI.isLittleEndian())
2563 Offset = Offset + MSB - 1;
2564 for (unsigned i = 0; i != MSB; ++i) {
2565 Val = (Val << 8) | (unsigned char)Str[Offset];
2566 Offset += TLI.isLittleEndian() ? -1 : 1;
2568 return DAG.getConstant(Val, VT);
2571 /// getMemBasePlusOffset - Returns base and offset node for the
2573 static SDOperand getMemBasePlusOffset(SDOperand Base, unsigned Offset,
2574 SelectionDAG &DAG) {
2575 MVT VT = Base.getValueType();
2576 return DAG.getNode(ISD::ADD, VT, Base, DAG.getConstant(Offset, VT));
2579 /// isMemSrcFromString - Returns true if memcpy source is a string constant.
2581 static bool isMemSrcFromString(SDOperand Src, std::string &Str) {
2582 unsigned SrcDelta = 0;
2583 GlobalAddressSDNode *G = NULL;
2584 if (Src.getOpcode() == ISD::GlobalAddress)
2585 G = cast<GlobalAddressSDNode>(Src);
2586 else if (Src.getOpcode() == ISD::ADD &&
2587 Src.getOperand(0).getOpcode() == ISD::GlobalAddress &&
2588 Src.getOperand(1).getOpcode() == ISD::Constant) {
2589 G = cast<GlobalAddressSDNode>(Src.getOperand(0));
2590 SrcDelta = cast<ConstantSDNode>(Src.getOperand(1))->getValue();
2595 GlobalVariable *GV = dyn_cast<GlobalVariable>(G->getGlobal());
2596 if (GV && GetConstantStringInfo(GV, Str, SrcDelta, false))
2602 /// MeetsMaxMemopRequirement - Determines if the number of memory ops required
2603 /// to replace the memset / memcpy is below the threshold. It also returns the
2604 /// types of the sequence of memory ops to perform memset / memcpy.
2606 bool MeetsMaxMemopRequirement(std::vector<MVT> &MemOps,
2607 SDOperand Dst, SDOperand Src,
2608 unsigned Limit, uint64_t Size, unsigned &Align,
2610 const TargetLowering &TLI) {
2611 bool AllowUnalign = TLI.allowsUnalignedMemoryAccesses();
2614 bool isSrcStr = isMemSrcFromString(Src, Str);
2615 bool isSrcConst = isa<ConstantSDNode>(Src);
2616 MVT VT= TLI.getOptimalMemOpType(Size, Align, isSrcConst, isSrcStr);
2617 if (VT != MVT::iAny) {
2618 unsigned NewAlign = (unsigned)
2619 TLI.getTargetData()->getABITypeAlignment(VT.getTypeForMVT());
2620 // If source is a string constant, this will require an unaligned load.
2621 if (NewAlign > Align && (isSrcConst || AllowUnalign)) {
2622 if (Dst.getOpcode() != ISD::FrameIndex) {
2623 // Can't change destination alignment. It requires a unaligned store.
2627 int FI = cast<FrameIndexSDNode>(Dst)->getIndex();
2628 MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
2629 if (MFI->isFixedObjectIndex(FI)) {
2630 // Can't change destination alignment. It requires a unaligned store.
2634 // Give the stack frame object a larger alignment if needed.
2635 if (MFI->getObjectAlignment(FI) < NewAlign)
2636 MFI->setObjectAlignment(FI, NewAlign);
2643 if (VT == MVT::iAny) {
2647 switch (Align & 7) {
2648 case 0: VT = MVT::i64; break;
2649 case 4: VT = MVT::i32; break;
2650 case 2: VT = MVT::i16; break;
2651 default: VT = MVT::i8; break;
2656 while (!TLI.isTypeLegal(LVT))
2657 LVT = (MVT::SimpleValueType)(LVT.getSimpleVT() - 1);
2658 assert(LVT.isInteger());
2664 unsigned NumMemOps = 0;
2666 unsigned VTSize = VT.getSizeInBits() / 8;
2667 while (VTSize > Size) {
2668 // For now, only use non-vector load / store's for the left-over pieces.
2669 if (VT.isVector()) {
2671 while (!TLI.isTypeLegal(VT))
2672 VT = (MVT::SimpleValueType)(VT.getSimpleVT() - 1);
2673 VTSize = VT.getSizeInBits() / 8;
2675 VT = (MVT::SimpleValueType)(VT.getSimpleVT() - 1);
2680 if (++NumMemOps > Limit)
2682 MemOps.push_back(VT);
2689 static SDOperand getMemcpyLoadsAndStores(SelectionDAG &DAG,
2690 SDOperand Chain, SDOperand Dst,
2691 SDOperand Src, uint64_t Size,
2692 unsigned Align, bool AlwaysInline,
2693 const Value *DstSV, uint64_t DstSVOff,
2694 const Value *SrcSV, uint64_t SrcSVOff){
2695 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
2697 // Expand memcpy to a series of load and store ops if the size operand falls
2698 // below a certain threshold.
2699 std::vector<MVT> MemOps;
2700 uint64_t Limit = -1;
2702 Limit = TLI.getMaxStoresPerMemcpy();
2703 unsigned DstAlign = Align; // Destination alignment can change.
2704 if (!MeetsMaxMemopRequirement(MemOps, Dst, Src, Limit, Size, DstAlign,
2709 bool CopyFromStr = isMemSrcFromString(Src, Str);
2711 SmallVector<SDOperand, 8> OutChains;
2712 unsigned NumMemOps = MemOps.size();
2713 uint64_t SrcOff = 0, DstOff = 0;
2714 for (unsigned i = 0; i < NumMemOps; i++) {
2716 unsigned VTSize = VT.getSizeInBits() / 8;
2717 SDOperand Value, Store;
2719 if (CopyFromStr && !VT.isVector()) {
2720 // It's unlikely a store of a vector immediate can be done in a single
2721 // instruction. It would require a load from a constantpool first.
2722 // FIXME: Handle cases where store of vector immediate is done in a
2723 // single instruction.
2724 Value = getMemsetStringVal(VT, DAG, TLI, Str, SrcOff);
2725 Store = DAG.getStore(Chain, Value,
2726 getMemBasePlusOffset(Dst, DstOff, DAG),
2727 DstSV, DstSVOff + DstOff);
2729 Value = DAG.getLoad(VT, Chain,
2730 getMemBasePlusOffset(Src, SrcOff, DAG),
2731 SrcSV, SrcSVOff + SrcOff, false, Align);
2732 Store = DAG.getStore(Chain, Value,
2733 getMemBasePlusOffset(Dst, DstOff, DAG),
2734 DstSV, DstSVOff + DstOff, false, DstAlign);
2736 OutChains.push_back(Store);
2741 return DAG.getNode(ISD::TokenFactor, MVT::Other,
2742 &OutChains[0], OutChains.size());
2745 static SDOperand getMemmoveLoadsAndStores(SelectionDAG &DAG,
2746 SDOperand Chain, SDOperand Dst,
2747 SDOperand Src, uint64_t Size,
2748 unsigned Align, bool AlwaysInline,
2749 const Value *DstSV, uint64_t DstSVOff,
2750 const Value *SrcSV, uint64_t SrcSVOff){
2751 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
2753 // Expand memmove to a series of load and store ops if the size operand falls
2754 // below a certain threshold.
2755 std::vector<MVT> MemOps;
2756 uint64_t Limit = -1;
2758 Limit = TLI.getMaxStoresPerMemmove();
2759 unsigned DstAlign = Align; // Destination alignment can change.
2760 if (!MeetsMaxMemopRequirement(MemOps, Dst, Src, Limit, Size, DstAlign,
2764 uint64_t SrcOff = 0, DstOff = 0;
2766 SmallVector<SDOperand, 8> LoadValues;
2767 SmallVector<SDOperand, 8> LoadChains;
2768 SmallVector<SDOperand, 8> OutChains;
2769 unsigned NumMemOps = MemOps.size();
2770 for (unsigned i = 0; i < NumMemOps; i++) {
2772 unsigned VTSize = VT.getSizeInBits() / 8;
2773 SDOperand Value, Store;
2775 Value = DAG.getLoad(VT, Chain,
2776 getMemBasePlusOffset(Src, SrcOff, DAG),
2777 SrcSV, SrcSVOff + SrcOff, false, Align);
2778 LoadValues.push_back(Value);
2779 LoadChains.push_back(Value.getValue(1));
2782 Chain = DAG.getNode(ISD::TokenFactor, MVT::Other,
2783 &LoadChains[0], LoadChains.size());
2785 for (unsigned i = 0; i < NumMemOps; i++) {
2787 unsigned VTSize = VT.getSizeInBits() / 8;
2788 SDOperand Value, Store;
2790 Store = DAG.getStore(Chain, LoadValues[i],
2791 getMemBasePlusOffset(Dst, DstOff, DAG),
2792 DstSV, DstSVOff + DstOff, false, DstAlign);
2793 OutChains.push_back(Store);
2797 return DAG.getNode(ISD::TokenFactor, MVT::Other,
2798 &OutChains[0], OutChains.size());
2801 static SDOperand getMemsetStores(SelectionDAG &DAG,
2802 SDOperand Chain, SDOperand Dst,
2803 SDOperand Src, uint64_t Size,
2805 const Value *DstSV, uint64_t DstSVOff) {
2806 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
2808 // Expand memset to a series of load/store ops if the size operand
2809 // falls below a certain threshold.
2810 std::vector<MVT> MemOps;
2811 if (!MeetsMaxMemopRequirement(MemOps, Dst, Src, TLI.getMaxStoresPerMemset(),
2812 Size, Align, DAG, TLI))
2815 SmallVector<SDOperand, 8> OutChains;
2816 uint64_t DstOff = 0;
2818 unsigned NumMemOps = MemOps.size();
2819 for (unsigned i = 0; i < NumMemOps; i++) {
2821 unsigned VTSize = VT.getSizeInBits() / 8;
2822 SDOperand Value = getMemsetValue(Src, VT, DAG);
2823 SDOperand Store = DAG.getStore(Chain, Value,
2824 getMemBasePlusOffset(Dst, DstOff, DAG),
2825 DstSV, DstSVOff + DstOff);
2826 OutChains.push_back(Store);
2830 return DAG.getNode(ISD::TokenFactor, MVT::Other,
2831 &OutChains[0], OutChains.size());
2834 SDOperand SelectionDAG::getMemcpy(SDOperand Chain, SDOperand Dst,
2835 SDOperand Src, SDOperand Size,
2836 unsigned Align, bool AlwaysInline,
2837 const Value *DstSV, uint64_t DstSVOff,
2838 const Value *SrcSV, uint64_t SrcSVOff) {
2840 // Check to see if we should lower the memcpy to loads and stores first.
2841 // For cases within the target-specified limits, this is the best choice.
2842 ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size);
2844 // Memcpy with size zero? Just return the original chain.
2845 if (ConstantSize->isNullValue())
2849 getMemcpyLoadsAndStores(*this, Chain, Dst, Src, ConstantSize->getValue(),
2850 Align, false, DstSV, DstSVOff, SrcSV, SrcSVOff);
2855 // Then check to see if we should lower the memcpy with target-specific
2856 // code. If the target chooses to do this, this is the next best.
2858 TLI.EmitTargetCodeForMemcpy(*this, Chain, Dst, Src, Size, Align,
2860 DstSV, DstSVOff, SrcSV, SrcSVOff);
2864 // If we really need inline code and the target declined to provide it,
2865 // use a (potentially long) sequence of loads and stores.
2867 assert(ConstantSize && "AlwaysInline requires a constant size!");
2868 return getMemcpyLoadsAndStores(*this, Chain, Dst, Src,
2869 ConstantSize->getValue(), Align, true,
2870 DstSV, DstSVOff, SrcSV, SrcSVOff);
2873 // Emit a library call.
2874 TargetLowering::ArgListTy Args;
2875 TargetLowering::ArgListEntry Entry;
2876 Entry.Ty = TLI.getTargetData()->getIntPtrType();
2877 Entry.Node = Dst; Args.push_back(Entry);
2878 Entry.Node = Src; Args.push_back(Entry);
2879 Entry.Node = Size; Args.push_back(Entry);
2880 std::pair<SDOperand,SDOperand> CallResult =
2881 TLI.LowerCallTo(Chain, Type::VoidTy,
2882 false, false, false, CallingConv::C, false,
2883 getExternalSymbol("memcpy", TLI.getPointerTy()),
2885 return CallResult.second;
2888 SDOperand SelectionDAG::getMemmove(SDOperand Chain, SDOperand Dst,
2889 SDOperand Src, SDOperand Size,
2891 const Value *DstSV, uint64_t DstSVOff,
2892 const Value *SrcSV, uint64_t SrcSVOff) {
2894 // Check to see if we should lower the memmove to loads and stores first.
2895 // For cases within the target-specified limits, this is the best choice.
2896 ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size);
2898 // Memmove with size zero? Just return the original chain.
2899 if (ConstantSize->isNullValue())
2903 getMemmoveLoadsAndStores(*this, Chain, Dst, Src, ConstantSize->getValue(),
2904 Align, false, DstSV, DstSVOff, SrcSV, SrcSVOff);
2909 // Then check to see if we should lower the memmove with target-specific
2910 // code. If the target chooses to do this, this is the next best.
2912 TLI.EmitTargetCodeForMemmove(*this, Chain, Dst, Src, Size, Align,
2913 DstSV, DstSVOff, SrcSV, SrcSVOff);
2917 // Emit a library call.
2918 TargetLowering::ArgListTy Args;
2919 TargetLowering::ArgListEntry Entry;
2920 Entry.Ty = TLI.getTargetData()->getIntPtrType();
2921 Entry.Node = Dst; Args.push_back(Entry);
2922 Entry.Node = Src; Args.push_back(Entry);
2923 Entry.Node = Size; Args.push_back(Entry);
2924 std::pair<SDOperand,SDOperand> CallResult =
2925 TLI.LowerCallTo(Chain, Type::VoidTy,
2926 false, false, false, CallingConv::C, false,
2927 getExternalSymbol("memmove", TLI.getPointerTy()),
2929 return CallResult.second;
2932 SDOperand SelectionDAG::getMemset(SDOperand Chain, SDOperand Dst,
2933 SDOperand Src, SDOperand Size,
2935 const Value *DstSV, uint64_t DstSVOff) {
2937 // Check to see if we should lower the memset to stores first.
2938 // For cases within the target-specified limits, this is the best choice.
2939 ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size);
2941 // Memset with size zero? Just return the original chain.
2942 if (ConstantSize->isNullValue())
2946 getMemsetStores(*this, Chain, Dst, Src, ConstantSize->getValue(), Align,
2952 // Then check to see if we should lower the memset with target-specific
2953 // code. If the target chooses to do this, this is the next best.
2955 TLI.EmitTargetCodeForMemset(*this, Chain, Dst, Src, Size, Align,
2960 // Emit a library call.
2961 const Type *IntPtrTy = TLI.getTargetData()->getIntPtrType();
2962 TargetLowering::ArgListTy Args;
2963 TargetLowering::ArgListEntry Entry;
2964 Entry.Node = Dst; Entry.Ty = IntPtrTy;
2965 Args.push_back(Entry);
2966 // Extend or truncate the argument to be an i32 value for the call.
2967 if (Src.getValueType().bitsGT(MVT::i32))
2968 Src = getNode(ISD::TRUNCATE, MVT::i32, Src);
2970 Src = getNode(ISD::ZERO_EXTEND, MVT::i32, Src);
2971 Entry.Node = Src; Entry.Ty = Type::Int32Ty; Entry.isSExt = true;
2972 Args.push_back(Entry);
2973 Entry.Node = Size; Entry.Ty = IntPtrTy; Entry.isSExt = false;
2974 Args.push_back(Entry);
2975 std::pair<SDOperand,SDOperand> CallResult =
2976 TLI.LowerCallTo(Chain, Type::VoidTy,
2977 false, false, false, CallingConv::C, false,
2978 getExternalSymbol("memset", TLI.getPointerTy()),
2980 return CallResult.second;
2983 SDOperand SelectionDAG::getAtomic(unsigned Opcode, SDOperand Chain,
2984 SDOperand Ptr, SDOperand Cmp,
2985 SDOperand Swp, const Value* PtrVal,
2986 unsigned Alignment) {
2987 assert(Opcode == ISD::ATOMIC_CMP_SWAP && "Invalid Atomic Op");
2988 assert(Cmp.getValueType() == Swp.getValueType() && "Invalid Atomic Op Types");
2989 SDVTList VTs = getVTList(Cmp.getValueType(), MVT::Other);
2990 FoldingSetNodeID ID;
2991 SDOperand Ops[] = {Chain, Ptr, Cmp, Swp};
2992 AddNodeIDNode(ID, Opcode, VTs, Ops, 4);
2994 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
2995 return SDOperand(E, 0);
2996 SDNode* N = new AtomicSDNode(Opcode, VTs, Chain, Ptr, Cmp, Swp,
2998 CSEMap.InsertNode(N, IP);
2999 AllNodes.push_back(N);
3000 return SDOperand(N, 0);
3003 SDOperand SelectionDAG::getAtomic(unsigned Opcode, SDOperand Chain,
3004 SDOperand Ptr, SDOperand Val,
3005 const Value* PtrVal,
3006 unsigned Alignment) {
3007 assert(( Opcode == ISD::ATOMIC_LOAD_ADD || Opcode == ISD::ATOMIC_LOAD_SUB
3008 || Opcode == ISD::ATOMIC_SWAP || Opcode == ISD::ATOMIC_LOAD_AND
3009 || Opcode == ISD::ATOMIC_LOAD_OR || Opcode == ISD::ATOMIC_LOAD_XOR
3010 || Opcode == ISD::ATOMIC_LOAD_NAND
3011 || Opcode == ISD::ATOMIC_LOAD_MIN || Opcode == ISD::ATOMIC_LOAD_MAX
3012 || Opcode == ISD::ATOMIC_LOAD_UMIN || Opcode == ISD::ATOMIC_LOAD_UMAX)
3013 && "Invalid Atomic Op");
3014 SDVTList VTs = getVTList(Val.getValueType(), MVT::Other);
3015 FoldingSetNodeID ID;
3016 SDOperand Ops[] = {Chain, Ptr, Val};
3017 AddNodeIDNode(ID, Opcode, VTs, Ops, 3);
3019 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
3020 return SDOperand(E, 0);
3021 SDNode* N = new AtomicSDNode(Opcode, VTs, Chain, Ptr, Val,
3023 CSEMap.InsertNode(N, IP);
3024 AllNodes.push_back(N);
3025 return SDOperand(N, 0);
3029 SelectionDAG::getLoad(ISD::MemIndexedMode AM, ISD::LoadExtType ExtType,
3030 MVT VT, SDOperand Chain,
3031 SDOperand Ptr, SDOperand Offset,
3032 const Value *SV, int SVOffset, MVT EVT,
3033 bool isVolatile, unsigned Alignment) {
3034 if (Alignment == 0) { // Ensure that codegen never sees alignment 0
3036 if (VT != MVT::iPTR) {
3037 Ty = VT.getTypeForMVT();
3039 const PointerType *PT = dyn_cast<PointerType>(SV->getType());
3040 assert(PT && "Value for load must be a pointer");
3041 Ty = PT->getElementType();
3043 assert(Ty && "Could not get type information for load");
3044 Alignment = TLI.getTargetData()->getABITypeAlignment(Ty);
3048 ExtType = ISD::NON_EXTLOAD;
3049 } else if (ExtType == ISD::NON_EXTLOAD) {
3050 assert(VT == EVT && "Non-extending load from different memory type!");
3054 assert(EVT == VT.getVectorElementType() && "Invalid vector extload!");
3056 assert(EVT.bitsLT(VT) &&
3057 "Should only be an extending load, not truncating!");
3058 assert((ExtType == ISD::EXTLOAD || VT.isInteger()) &&
3059 "Cannot sign/zero extend a FP/Vector load!");
3060 assert(VT.isInteger() == EVT.isInteger() &&
3061 "Cannot convert from FP to Int or Int -> FP!");
3064 bool Indexed = AM != ISD::UNINDEXED;
3065 assert((Indexed || Offset.getOpcode() == ISD::UNDEF) &&
3066 "Unindexed load with an offset!");
3068 SDVTList VTs = Indexed ?
3069 getVTList(VT, Ptr.getValueType(), MVT::Other) : getVTList(VT, MVT::Other);
3070 SDOperand Ops[] = { Chain, Ptr, Offset };
3071 FoldingSetNodeID ID;
3072 AddNodeIDNode(ID, ISD::LOAD, VTs, Ops, 3);
3074 ID.AddInteger(ExtType);
3075 ID.AddInteger(EVT.getRawBits());
3076 ID.AddInteger(Alignment);
3077 ID.AddInteger(isVolatile);
3079 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
3080 return SDOperand(E, 0);
3081 SDNode *N = new LoadSDNode(Ops, VTs, AM, ExtType, EVT, SV, SVOffset,
3082 Alignment, isVolatile);
3083 CSEMap.InsertNode(N, IP);
3084 AllNodes.push_back(N);
3085 return SDOperand(N, 0);
3088 SDOperand SelectionDAG::getLoad(MVT VT,
3089 SDOperand Chain, SDOperand Ptr,
3090 const Value *SV, int SVOffset,
3091 bool isVolatile, unsigned Alignment) {
3092 SDOperand Undef = getNode(ISD::UNDEF, Ptr.getValueType());
3093 return getLoad(ISD::UNINDEXED, ISD::NON_EXTLOAD, VT, Chain, Ptr, Undef,
3094 SV, SVOffset, VT, isVolatile, Alignment);
3097 SDOperand SelectionDAG::getExtLoad(ISD::LoadExtType ExtType, MVT VT,
3098 SDOperand Chain, SDOperand Ptr,
3100 int SVOffset, MVT EVT,
3101 bool isVolatile, unsigned Alignment) {
3102 SDOperand Undef = getNode(ISD::UNDEF, Ptr.getValueType());
3103 return getLoad(ISD::UNINDEXED, ExtType, VT, Chain, Ptr, Undef,
3104 SV, SVOffset, EVT, isVolatile, Alignment);
3108 SelectionDAG::getIndexedLoad(SDOperand OrigLoad, SDOperand Base,
3109 SDOperand Offset, ISD::MemIndexedMode AM) {
3110 LoadSDNode *LD = cast<LoadSDNode>(OrigLoad);
3111 assert(LD->getOffset().getOpcode() == ISD::UNDEF &&
3112 "Load is already a indexed load!");
3113 return getLoad(AM, LD->getExtensionType(), OrigLoad.getValueType(),
3114 LD->getChain(), Base, Offset, LD->getSrcValue(),
3115 LD->getSrcValueOffset(), LD->getMemoryVT(),
3116 LD->isVolatile(), LD->getAlignment());
3119 SDOperand SelectionDAG::getStore(SDOperand Chain, SDOperand Val,
3120 SDOperand Ptr, const Value *SV, int SVOffset,
3121 bool isVolatile, unsigned Alignment) {
3122 MVT VT = Val.getValueType();
3124 if (Alignment == 0) { // Ensure that codegen never sees alignment 0
3126 if (VT != MVT::iPTR) {
3127 Ty = VT.getTypeForMVT();
3129 const PointerType *PT = dyn_cast<PointerType>(SV->getType());
3130 assert(PT && "Value for store must be a pointer");
3131 Ty = PT->getElementType();
3133 assert(Ty && "Could not get type information for store");
3134 Alignment = TLI.getTargetData()->getABITypeAlignment(Ty);
3136 SDVTList VTs = getVTList(MVT::Other);
3137 SDOperand Undef = getNode(ISD::UNDEF, Ptr.getValueType());
3138 SDOperand Ops[] = { Chain, Val, Ptr, Undef };
3139 FoldingSetNodeID ID;
3140 AddNodeIDNode(ID, ISD::STORE, VTs, Ops, 4);
3141 ID.AddInteger(ISD::UNINDEXED);
3142 ID.AddInteger(false);
3143 ID.AddInteger(VT.getRawBits());
3144 ID.AddInteger(Alignment);
3145 ID.AddInteger(isVolatile);
3147 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
3148 return SDOperand(E, 0);
3149 SDNode *N = new StoreSDNode(Ops, VTs, ISD::UNINDEXED, false,
3150 VT, SV, SVOffset, Alignment, isVolatile);
3151 CSEMap.InsertNode(N, IP);
3152 AllNodes.push_back(N);
3153 return SDOperand(N, 0);
3156 SDOperand SelectionDAG::getTruncStore(SDOperand Chain, SDOperand Val,
3157 SDOperand Ptr, const Value *SV,
3158 int SVOffset, MVT SVT,
3159 bool isVolatile, unsigned Alignment) {
3160 MVT VT = Val.getValueType();
3163 return getStore(Chain, Val, Ptr, SV, SVOffset, isVolatile, Alignment);
3165 assert(VT.bitsGT(SVT) && "Not a truncation?");
3166 assert(VT.isInteger() == SVT.isInteger() &&
3167 "Can't do FP-INT conversion!");
3169 if (Alignment == 0) { // Ensure that codegen never sees alignment 0
3171 if (VT != MVT::iPTR) {
3172 Ty = VT.getTypeForMVT();
3174 const PointerType *PT = dyn_cast<PointerType>(SV->getType());
3175 assert(PT && "Value for store must be a pointer");
3176 Ty = PT->getElementType();
3178 assert(Ty && "Could not get type information for store");
3179 Alignment = TLI.getTargetData()->getABITypeAlignment(Ty);
3181 SDVTList VTs = getVTList(MVT::Other);
3182 SDOperand Undef = getNode(ISD::UNDEF, Ptr.getValueType());
3183 SDOperand Ops[] = { Chain, Val, Ptr, Undef };
3184 FoldingSetNodeID ID;
3185 AddNodeIDNode(ID, ISD::STORE, VTs, Ops, 4);
3186 ID.AddInteger(ISD::UNINDEXED);
3188 ID.AddInteger(SVT.getRawBits());
3189 ID.AddInteger(Alignment);
3190 ID.AddInteger(isVolatile);
3192 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
3193 return SDOperand(E, 0);
3194 SDNode *N = new StoreSDNode(Ops, VTs, ISD::UNINDEXED, true,
3195 SVT, SV, SVOffset, Alignment, isVolatile);
3196 CSEMap.InsertNode(N, IP);
3197 AllNodes.push_back(N);
3198 return SDOperand(N, 0);
3202 SelectionDAG::getIndexedStore(SDOperand OrigStore, SDOperand Base,
3203 SDOperand Offset, ISD::MemIndexedMode AM) {
3204 StoreSDNode *ST = cast<StoreSDNode>(OrigStore);
3205 assert(ST->getOffset().getOpcode() == ISD::UNDEF &&
3206 "Store is already a indexed store!");
3207 SDVTList VTs = getVTList(Base.getValueType(), MVT::Other);
3208 SDOperand Ops[] = { ST->getChain(), ST->getValue(), Base, Offset };
3209 FoldingSetNodeID ID;
3210 AddNodeIDNode(ID, ISD::STORE, VTs, Ops, 4);
3212 ID.AddInteger(ST->isTruncatingStore());
3213 ID.AddInteger(ST->getMemoryVT().getRawBits());
3214 ID.AddInteger(ST->getAlignment());
3215 ID.AddInteger(ST->isVolatile());
3217 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
3218 return SDOperand(E, 0);
3219 SDNode *N = new StoreSDNode(Ops, VTs, AM,
3220 ST->isTruncatingStore(), ST->getMemoryVT(),
3221 ST->getSrcValue(), ST->getSrcValueOffset(),
3222 ST->getAlignment(), ST->isVolatile());
3223 CSEMap.InsertNode(N, IP);
3224 AllNodes.push_back(N);
3225 return SDOperand(N, 0);
3228 SDOperand SelectionDAG::getVAArg(MVT VT,
3229 SDOperand Chain, SDOperand Ptr,
3231 SDOperand Ops[] = { Chain, Ptr, SV };
3232 return getNode(ISD::VAARG, getVTList(VT, MVT::Other), Ops, 3);
3235 SDOperand SelectionDAG::getNode(unsigned Opcode, MVT VT,
3236 SDOperandPtr Ops, unsigned NumOps) {
3238 case 0: return getNode(Opcode, VT);
3239 case 1: return getNode(Opcode, VT, Ops[0]);
3240 case 2: return getNode(Opcode, VT, Ops[0], Ops[1]);
3241 case 3: return getNode(Opcode, VT, Ops[0], Ops[1], Ops[2]);
3247 case ISD::SELECT_CC: {
3248 assert(NumOps == 5 && "SELECT_CC takes 5 operands!");
3249 assert(Ops[0].getValueType() == Ops[1].getValueType() &&
3250 "LHS and RHS of condition must have same type!");
3251 assert(Ops[2].getValueType() == Ops[3].getValueType() &&
3252 "True and False arms of SelectCC must have same type!");
3253 assert(Ops[2].getValueType() == VT &&
3254 "select_cc node must be of same type as true and false value!");
3258 assert(NumOps == 5 && "BR_CC takes 5 operands!");
3259 assert(Ops[2].getValueType() == Ops[3].getValueType() &&
3260 "LHS/RHS of comparison should match types!");
3267 SDVTList VTs = getVTList(VT);
3268 if (VT != MVT::Flag) {
3269 FoldingSetNodeID ID;
3270 AddNodeIDNode(ID, Opcode, VTs, Ops, NumOps);
3272 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
3273 return SDOperand(E, 0);
3274 N = new SDNode(Opcode, VTs, Ops, NumOps);
3275 CSEMap.InsertNode(N, IP);
3277 N = new SDNode(Opcode, VTs, Ops, NumOps);
3279 AllNodes.push_back(N);
3280 return SDOperand(N, 0);
3283 SDOperand SelectionDAG::getNode(unsigned Opcode,
3284 std::vector<MVT> &ResultTys,
3285 SDOperandPtr Ops, unsigned NumOps) {
3286 return getNode(Opcode, getNodeValueTypes(ResultTys), ResultTys.size(),
3290 SDOperand SelectionDAG::getNode(unsigned Opcode,
3291 const MVT *VTs, unsigned NumVTs,
3292 SDOperandPtr Ops, unsigned NumOps) {
3294 return getNode(Opcode, VTs[0], Ops, NumOps);
3295 return getNode(Opcode, makeVTList(VTs, NumVTs), Ops, NumOps);
3298 SDOperand SelectionDAG::getNode(unsigned Opcode, SDVTList VTList,
3299 SDOperandPtr Ops, unsigned NumOps) {
3300 if (VTList.NumVTs == 1)
3301 return getNode(Opcode, VTList.VTs[0], Ops, NumOps);
3304 // FIXME: figure out how to safely handle things like
3305 // int foo(int x) { return 1 << (x & 255); }
3306 // int bar() { return foo(256); }
3308 case ISD::SRA_PARTS:
3309 case ISD::SRL_PARTS:
3310 case ISD::SHL_PARTS:
3311 if (N3.getOpcode() == ISD::SIGN_EXTEND_INREG &&
3312 cast<VTSDNode>(N3.getOperand(1))->getVT() != MVT::i1)
3313 return getNode(Opcode, VT, N1, N2, N3.getOperand(0));
3314 else if (N3.getOpcode() == ISD::AND)
3315 if (ConstantSDNode *AndRHS = dyn_cast<ConstantSDNode>(N3.getOperand(1))) {
3316 // If the and is only masking out bits that cannot effect the shift,
3317 // eliminate the and.
3318 unsigned NumBits = VT.getSizeInBits()*2;
3319 if ((AndRHS->getValue() & (NumBits-1)) == NumBits-1)
3320 return getNode(Opcode, VT, N1, N2, N3.getOperand(0));
3326 // Memoize the node unless it returns a flag.
3328 if (VTList.VTs[VTList.NumVTs-1] != MVT::Flag) {
3329 FoldingSetNodeID ID;
3330 AddNodeIDNode(ID, Opcode, VTList, Ops, NumOps);
3332 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
3333 return SDOperand(E, 0);
3335 N = new UnarySDNode(Opcode, VTList, Ops[0]);
3336 else if (NumOps == 2)
3337 N = new BinarySDNode(Opcode, VTList, Ops[0], Ops[1]);
3338 else if (NumOps == 3)
3339 N = new TernarySDNode(Opcode, VTList, Ops[0], Ops[1], Ops[2]);
3341 N = new SDNode(Opcode, VTList, Ops, NumOps);
3342 CSEMap.InsertNode(N, IP);
3345 N = new UnarySDNode(Opcode, VTList, Ops[0]);
3346 else if (NumOps == 2)
3347 N = new BinarySDNode(Opcode, VTList, Ops[0], Ops[1]);
3348 else if (NumOps == 3)
3349 N = new TernarySDNode(Opcode, VTList, Ops[0], Ops[1], Ops[2]);
3351 N = new SDNode(Opcode, VTList, Ops, NumOps);
3353 AllNodes.push_back(N);
3354 return SDOperand(N, 0);
3357 SDOperand SelectionDAG::getNode(unsigned Opcode, SDVTList VTList) {
3358 return getNode(Opcode, VTList, (SDOperand*)0, 0);
3361 SDOperand SelectionDAG::getNode(unsigned Opcode, SDVTList VTList,
3363 SDOperand Ops[] = { N1 };
3364 return getNode(Opcode, VTList, Ops, 1);
3367 SDOperand SelectionDAG::getNode(unsigned Opcode, SDVTList VTList,
3368 SDOperand N1, SDOperand N2) {
3369 SDOperand Ops[] = { N1, N2 };
3370 return getNode(Opcode, VTList, Ops, 2);
3373 SDOperand SelectionDAG::getNode(unsigned Opcode, SDVTList VTList,
3374 SDOperand N1, SDOperand N2, SDOperand N3) {
3375 SDOperand Ops[] = { N1, N2, N3 };
3376 return getNode(Opcode, VTList, Ops, 3);
3379 SDOperand SelectionDAG::getNode(unsigned Opcode, SDVTList VTList,
3380 SDOperand N1, SDOperand N2, SDOperand N3,
3382 SDOperand Ops[] = { N1, N2, N3, N4 };
3383 return getNode(Opcode, VTList, Ops, 4);
3386 SDOperand SelectionDAG::getNode(unsigned Opcode, SDVTList VTList,
3387 SDOperand N1, SDOperand N2, SDOperand N3,
3388 SDOperand N4, SDOperand N5) {
3389 SDOperand Ops[] = { N1, N2, N3, N4, N5 };
3390 return getNode(Opcode, VTList, Ops, 5);
3393 SDVTList SelectionDAG::getVTList(MVT VT) {
3394 return makeVTList(SDNode::getValueTypeList(VT), 1);
3397 SDVTList SelectionDAG::getVTList(MVT VT1, MVT VT2) {
3398 for (std::list<std::vector<MVT> >::iterator I = VTList.begin(),
3399 E = VTList.end(); I != E; ++I) {
3400 if (I->size() == 2 && (*I)[0] == VT1 && (*I)[1] == VT2)
3401 return makeVTList(&(*I)[0], 2);
3406 VTList.push_front(V);
3407 return makeVTList(&(*VTList.begin())[0], 2);
3409 SDVTList SelectionDAG::getVTList(MVT VT1, MVT VT2,
3411 for (std::list<std::vector<MVT> >::iterator I = VTList.begin(),
3412 E = VTList.end(); I != E; ++I) {
3413 if (I->size() == 3 && (*I)[0] == VT1 && (*I)[1] == VT2 &&
3415 return makeVTList(&(*I)[0], 3);
3421 VTList.push_front(V);
3422 return makeVTList(&(*VTList.begin())[0], 3);
3425 SDVTList SelectionDAG::getVTList(const MVT *VTs, unsigned NumVTs) {
3427 case 0: assert(0 && "Cannot have nodes without results!");
3428 case 1: return getVTList(VTs[0]);
3429 case 2: return getVTList(VTs[0], VTs[1]);
3430 case 3: return getVTList(VTs[0], VTs[1], VTs[2]);
3434 for (std::list<std::vector<MVT> >::iterator I = VTList.begin(),
3435 E = VTList.end(); I != E; ++I) {
3436 if (I->size() != NumVTs || VTs[0] != (*I)[0] || VTs[1] != (*I)[1]) continue;
3438 bool NoMatch = false;
3439 for (unsigned i = 2; i != NumVTs; ++i)
3440 if (VTs[i] != (*I)[i]) {
3445 return makeVTList(&*I->begin(), NumVTs);
3448 VTList.push_front(std::vector<MVT>(VTs, VTs+NumVTs));
3449 return makeVTList(&*VTList.begin()->begin(), NumVTs);
3453 /// UpdateNodeOperands - *Mutate* the specified node in-place to have the
3454 /// specified operands. If the resultant node already exists in the DAG,
3455 /// this does not modify the specified node, instead it returns the node that
3456 /// already exists. If the resultant node does not exist in the DAG, the
3457 /// input node is returned. As a degenerate case, if you specify the same
3458 /// input operands as the node already has, the input node is returned.
3459 SDOperand SelectionDAG::
3460 UpdateNodeOperands(SDOperand InN, SDOperand Op) {
3461 SDNode *N = InN.Val;
3462 assert(N->getNumOperands() == 1 && "Update with wrong number of operands");
3464 // Check to see if there is no change.
3465 if (Op == N->getOperand(0)) return InN;
3467 // See if the modified node already exists.
3468 void *InsertPos = 0;
3469 if (SDNode *Existing = FindModifiedNodeSlot(N, Op, InsertPos))
3470 return SDOperand(Existing, InN.ResNo);
3472 // Nope it doesn't. Remove the node from it's current place in the maps.
3474 RemoveNodeFromCSEMaps(N);
3476 // Now we update the operands.
3477 N->OperandList[0].getVal()->removeUser(0, N);
3478 N->OperandList[0] = Op;
3479 N->OperandList[0].setUser(N);
3480 Op.Val->addUser(0, N);
3482 // If this gets put into a CSE map, add it.
3483 if (InsertPos) CSEMap.InsertNode(N, InsertPos);
3487 SDOperand SelectionDAG::
3488 UpdateNodeOperands(SDOperand InN, SDOperand Op1, SDOperand Op2) {
3489 SDNode *N = InN.Val;
3490 assert(N->getNumOperands() == 2 && "Update with wrong number of operands");
3492 // Check to see if there is no change.
3493 if (Op1 == N->getOperand(0) && Op2 == N->getOperand(1))
3494 return InN; // No operands changed, just return the input node.
3496 // See if the modified node already exists.
3497 void *InsertPos = 0;
3498 if (SDNode *Existing = FindModifiedNodeSlot(N, Op1, Op2, InsertPos))
3499 return SDOperand(Existing, InN.ResNo);
3501 // Nope it doesn't. Remove the node from it's current place in the maps.
3503 RemoveNodeFromCSEMaps(N);
3505 // Now we update the operands.
3506 if (N->OperandList[0] != Op1) {
3507 N->OperandList[0].getVal()->removeUser(0, N);
3508 N->OperandList[0] = Op1;
3509 N->OperandList[0].setUser(N);
3510 Op1.Val->addUser(0, N);
3512 if (N->OperandList[1] != Op2) {
3513 N->OperandList[1].getVal()->removeUser(1, N);
3514 N->OperandList[1] = Op2;
3515 N->OperandList[1].setUser(N);
3516 Op2.Val->addUser(1, N);
3519 // If this gets put into a CSE map, add it.
3520 if (InsertPos) CSEMap.InsertNode(N, InsertPos);
3524 SDOperand SelectionDAG::
3525 UpdateNodeOperands(SDOperand N, SDOperand Op1, SDOperand Op2, SDOperand Op3) {
3526 SDOperand Ops[] = { Op1, Op2, Op3 };
3527 return UpdateNodeOperands(N, Ops, 3);
3530 SDOperand SelectionDAG::
3531 UpdateNodeOperands(SDOperand N, SDOperand Op1, SDOperand Op2,
3532 SDOperand Op3, SDOperand Op4) {
3533 SDOperand Ops[] = { Op1, Op2, Op3, Op4 };
3534 return UpdateNodeOperands(N, Ops, 4);
3537 SDOperand SelectionDAG::
3538 UpdateNodeOperands(SDOperand N, SDOperand Op1, SDOperand Op2,
3539 SDOperand Op3, SDOperand Op4, SDOperand Op5) {
3540 SDOperand Ops[] = { Op1, Op2, Op3, Op4, Op5 };
3541 return UpdateNodeOperands(N, Ops, 5);
3544 SDOperand SelectionDAG::
3545 UpdateNodeOperands(SDOperand InN, SDOperandPtr Ops, unsigned NumOps) {
3546 SDNode *N = InN.Val;
3547 assert(N->getNumOperands() == NumOps &&
3548 "Update with wrong number of operands");
3550 // Check to see if there is no change.
3551 bool AnyChange = false;
3552 for (unsigned i = 0; i != NumOps; ++i) {
3553 if (Ops[i] != N->getOperand(i)) {
3559 // No operands changed, just return the input node.
3560 if (!AnyChange) return InN;
3562 // See if the modified node already exists.
3563 void *InsertPos = 0;
3564 if (SDNode *Existing = FindModifiedNodeSlot(N, Ops, NumOps, InsertPos))
3565 return SDOperand(Existing, InN.ResNo);
3567 // Nope it doesn't. Remove the node from its current place in the maps.
3569 RemoveNodeFromCSEMaps(N);
3571 // Now we update the operands.
3572 for (unsigned i = 0; i != NumOps; ++i) {
3573 if (N->OperandList[i] != Ops[i]) {
3574 N->OperandList[i].getVal()->removeUser(i, N);
3575 N->OperandList[i] = Ops[i];
3576 N->OperandList[i].setUser(N);
3577 Ops[i].Val->addUser(i, N);
3581 // If this gets put into a CSE map, add it.
3582 if (InsertPos) CSEMap.InsertNode(N, InsertPos);
3586 /// MorphNodeTo - This frees the operands of the current node, resets the
3587 /// opcode, types, and operands to the specified value. This should only be
3588 /// used by the SelectionDAG class.
3589 void SDNode::MorphNodeTo(unsigned Opc, SDVTList L,
3590 SDOperandPtr Ops, unsigned NumOps) {
3593 NumValues = L.NumVTs;
3595 // Clear the operands list, updating used nodes to remove this from their
3597 for (op_iterator I = op_begin(), E = op_end(); I != E; ++I)
3598 I->getVal()->removeUser(std::distance(op_begin(), I), this);
3600 // If NumOps is larger than the # of operands we currently have, reallocate
3601 // the operand list.
3602 if (NumOps > NumOperands) {
3603 if (OperandsNeedDelete) {
3604 delete [] OperandList;
3606 OperandList = new SDUse[NumOps];
3607 OperandsNeedDelete = true;
3610 // Assign the new operands.
3611 NumOperands = NumOps;
3613 for (unsigned i = 0, e = NumOps; i != e; ++i) {
3614 OperandList[i] = Ops[i];
3615 OperandList[i].setUser(this);
3616 SDNode *N = OperandList[i].getVal();
3617 N->addUser(i, this);
3622 /// SelectNodeTo - These are used for target selectors to *mutate* the
3623 /// specified node to have the specified return type, Target opcode, and
3624 /// operands. Note that target opcodes are stored as
3625 /// ISD::BUILTIN_OP_END+TargetOpcode in the node opcode field.
3627 /// Note that SelectNodeTo returns the resultant node. If there is already a
3628 /// node of the specified opcode and operands, it returns that node instead of
3629 /// the current one.
3630 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned TargetOpc,
3632 SDVTList VTs = getVTList(VT);
3633 FoldingSetNodeID ID;
3634 AddNodeIDNode(ID, ISD::BUILTIN_OP_END+TargetOpc, VTs, (SDOperand*)0, 0);
3636 if (SDNode *ON = CSEMap.FindNodeOrInsertPos(ID, IP))
3639 RemoveNodeFromCSEMaps(N);
3641 N->MorphNodeTo(ISD::BUILTIN_OP_END+TargetOpc, VTs, SDOperandPtr(), 0);
3643 CSEMap.InsertNode(N, IP);
3647 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned TargetOpc,
3648 MVT VT, SDOperand Op1) {
3649 // If an identical node already exists, use it.
3650 SDVTList VTs = getVTList(VT);
3651 SDOperand Ops[] = { Op1 };
3653 FoldingSetNodeID ID;
3654 AddNodeIDNode(ID, ISD::BUILTIN_OP_END+TargetOpc, VTs, Ops, 1);
3656 if (SDNode *ON = CSEMap.FindNodeOrInsertPos(ID, IP))
3659 RemoveNodeFromCSEMaps(N);
3660 N->MorphNodeTo(ISD::BUILTIN_OP_END+TargetOpc, VTs, Ops, 1);
3661 CSEMap.InsertNode(N, IP);
3665 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned TargetOpc,
3666 MVT VT, SDOperand Op1,
3668 // If an identical node already exists, use it.
3669 SDVTList VTs = getVTList(VT);
3670 SDOperand Ops[] = { Op1, Op2 };
3672 FoldingSetNodeID ID;
3673 AddNodeIDNode(ID, ISD::BUILTIN_OP_END+TargetOpc, VTs, Ops, 2);
3675 if (SDNode *ON = CSEMap.FindNodeOrInsertPos(ID, IP))
3678 RemoveNodeFromCSEMaps(N);
3680 N->MorphNodeTo(ISD::BUILTIN_OP_END+TargetOpc, VTs, Ops, 2);
3682 CSEMap.InsertNode(N, IP); // Memoize the new node.
3686 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned TargetOpc,
3687 MVT VT, SDOperand Op1,
3688 SDOperand Op2, SDOperand Op3) {
3689 // If an identical node already exists, use it.
3690 SDVTList VTs = getVTList(VT);
3691 SDOperand Ops[] = { Op1, Op2, Op3 };
3692 FoldingSetNodeID ID;
3693 AddNodeIDNode(ID, ISD::BUILTIN_OP_END+TargetOpc, VTs, Ops, 3);
3695 if (SDNode *ON = CSEMap.FindNodeOrInsertPos(ID, IP))
3698 RemoveNodeFromCSEMaps(N);
3700 N->MorphNodeTo(ISD::BUILTIN_OP_END+TargetOpc, VTs, Ops, 3);
3702 CSEMap.InsertNode(N, IP); // Memoize the new node.
3706 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned TargetOpc,
3707 MVT VT, SDOperandPtr Ops,
3709 // If an identical node already exists, use it.
3710 SDVTList VTs = getVTList(VT);
3711 FoldingSetNodeID ID;
3712 AddNodeIDNode(ID, ISD::BUILTIN_OP_END+TargetOpc, VTs, Ops, NumOps);
3714 if (SDNode *ON = CSEMap.FindNodeOrInsertPos(ID, IP))
3717 RemoveNodeFromCSEMaps(N);
3718 N->MorphNodeTo(ISD::BUILTIN_OP_END+TargetOpc, VTs, Ops, NumOps);
3720 CSEMap.InsertNode(N, IP); // Memoize the new node.
3724 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned TargetOpc,
3726 SDOperand Op1, SDOperand Op2) {
3727 SDVTList VTs = getVTList(VT1, VT2);
3728 FoldingSetNodeID ID;
3729 SDOperand Ops[] = { Op1, Op2 };
3730 AddNodeIDNode(ID, ISD::BUILTIN_OP_END+TargetOpc, VTs, Ops, 2);
3732 if (SDNode *ON = CSEMap.FindNodeOrInsertPos(ID, IP))
3735 RemoveNodeFromCSEMaps(N);
3736 N->MorphNodeTo(ISD::BUILTIN_OP_END+TargetOpc, VTs, Ops, 2);
3737 CSEMap.InsertNode(N, IP); // Memoize the new node.
3741 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned TargetOpc,
3743 SDOperand Op1, SDOperand Op2,
3745 // If an identical node already exists, use it.
3746 SDVTList VTs = getVTList(VT1, VT2);
3747 SDOperand Ops[] = { Op1, Op2, Op3 };
3748 FoldingSetNodeID ID;
3749 AddNodeIDNode(ID, ISD::BUILTIN_OP_END+TargetOpc, VTs, Ops, 3);
3751 if (SDNode *ON = CSEMap.FindNodeOrInsertPos(ID, IP))
3754 RemoveNodeFromCSEMaps(N);
3756 N->MorphNodeTo(ISD::BUILTIN_OP_END+TargetOpc, VTs, Ops, 3);
3757 CSEMap.InsertNode(N, IP); // Memoize the new node.
3762 /// getTargetNode - These are used for target selectors to create a new node
3763 /// with specified return type(s), target opcode, and operands.
3765 /// Note that getTargetNode returns the resultant node. If there is already a
3766 /// node of the specified opcode and operands, it returns that node instead of
3767 /// the current one.
3768 SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT) {
3769 return getNode(ISD::BUILTIN_OP_END+Opcode, VT).Val;
3771 SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT, SDOperand Op1) {
3772 return getNode(ISD::BUILTIN_OP_END+Opcode, VT, Op1).Val;
3774 SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT,
3775 SDOperand Op1, SDOperand Op2) {
3776 return getNode(ISD::BUILTIN_OP_END+Opcode, VT, Op1, Op2).Val;
3778 SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT,
3779 SDOperand Op1, SDOperand Op2,
3781 return getNode(ISD::BUILTIN_OP_END+Opcode, VT, Op1, Op2, Op3).Val;
3783 SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT,
3784 SDOperandPtr Ops, unsigned NumOps) {
3785 return getNode(ISD::BUILTIN_OP_END+Opcode, VT, Ops, NumOps).Val;
3787 SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT1, MVT VT2) {
3788 const MVT *VTs = getNodeValueTypes(VT1, VT2);
3790 return getNode(ISD::BUILTIN_OP_END+Opcode, VTs, 2, &Op, 0).Val;
3792 SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT1,
3793 MVT VT2, SDOperand Op1) {
3794 const MVT *VTs = getNodeValueTypes(VT1, VT2);
3795 return getNode(ISD::BUILTIN_OP_END+Opcode, VTs, 2, &Op1, 1).Val;
3797 SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT1,
3798 MVT VT2, SDOperand Op1,
3800 const MVT *VTs = getNodeValueTypes(VT1, VT2);
3801 SDOperand Ops[] = { Op1, Op2 };
3802 return getNode(ISD::BUILTIN_OP_END+Opcode, VTs, 2, Ops, 2).Val;
3804 SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT1,
3805 MVT VT2, SDOperand Op1,
3806 SDOperand Op2, SDOperand Op3) {
3807 const MVT *VTs = getNodeValueTypes(VT1, VT2);
3808 SDOperand Ops[] = { Op1, Op2, Op3 };
3809 return getNode(ISD::BUILTIN_OP_END+Opcode, VTs, 2, Ops, 3).Val;
3811 SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT1, MVT VT2,
3812 SDOperandPtr Ops, unsigned NumOps) {
3813 const MVT *VTs = getNodeValueTypes(VT1, VT2);
3814 return getNode(ISD::BUILTIN_OP_END+Opcode, VTs, 2, Ops, NumOps).Val;
3816 SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT1, MVT VT2, MVT VT3,
3817 SDOperand Op1, SDOperand Op2) {
3818 const MVT *VTs = getNodeValueTypes(VT1, VT2, VT3);
3819 SDOperand Ops[] = { Op1, Op2 };
3820 return getNode(ISD::BUILTIN_OP_END+Opcode, VTs, 3, Ops, 2).Val;
3822 SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT1, MVT VT2, MVT VT3,
3823 SDOperand Op1, SDOperand Op2,
3825 const MVT *VTs = getNodeValueTypes(VT1, VT2, VT3);
3826 SDOperand Ops[] = { Op1, Op2, Op3 };
3827 return getNode(ISD::BUILTIN_OP_END+Opcode, VTs, 3, Ops, 3).Val;
3829 SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT1, MVT VT2, MVT VT3,
3830 SDOperandPtr Ops, unsigned NumOps) {
3831 const MVT *VTs = getNodeValueTypes(VT1, VT2, VT3);
3832 return getNode(ISD::BUILTIN_OP_END+Opcode, VTs, 3, Ops, NumOps).Val;
3834 SDNode *SelectionDAG::getTargetNode(unsigned Opcode, MVT VT1,
3835 MVT VT2, MVT VT3, MVT VT4,
3836 SDOperandPtr Ops, unsigned NumOps) {
3837 std::vector<MVT> VTList;
3838 VTList.push_back(VT1);
3839 VTList.push_back(VT2);
3840 VTList.push_back(VT3);
3841 VTList.push_back(VT4);
3842 const MVT *VTs = getNodeValueTypes(VTList);
3843 return getNode(ISD::BUILTIN_OP_END+Opcode, VTs, 4, Ops, NumOps).Val;
3845 SDNode *SelectionDAG::getTargetNode(unsigned Opcode,
3846 std::vector<MVT> &ResultTys,
3847 SDOperandPtr Ops, unsigned NumOps) {
3848 const MVT *VTs = getNodeValueTypes(ResultTys);
3849 return getNode(ISD::BUILTIN_OP_END+Opcode, VTs, ResultTys.size(),
3853 /// getNodeIfExists - Get the specified node if it's already available, or
3854 /// else return NULL.
3855 SDNode *SelectionDAG::getNodeIfExists(unsigned Opcode, SDVTList VTList,
3856 SDOperandPtr Ops, unsigned NumOps) {
3857 if (VTList.VTs[VTList.NumVTs-1] != MVT::Flag) {
3858 FoldingSetNodeID ID;
3859 AddNodeIDNode(ID, Opcode, VTList, Ops, NumOps);
3861 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
3868 /// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead.
3869 /// This can cause recursive merging of nodes in the DAG.
3871 /// This version assumes From has a single result value.
3873 void SelectionDAG::ReplaceAllUsesWith(SDOperand FromN, SDOperand To,
3874 DAGUpdateListener *UpdateListener) {
3875 SDNode *From = FromN.Val;
3876 assert(From->getNumValues() == 1 && FromN.ResNo == 0 &&
3877 "Cannot replace with this method!");
3878 assert(From != To.Val && "Cannot replace uses of with self");
3880 while (!From->use_empty()) {
3881 SDNode::use_iterator UI = From->use_begin();
3882 SDNode *U = UI->getUser();
3884 // This node is about to morph, remove its old self from the CSE maps.
3885 RemoveNodeFromCSEMaps(U);
3887 for (SDNode::op_iterator I = U->op_begin(), E = U->op_end();
3888 I != E; ++I, ++operandNum)
3889 if (I->getVal() == From) {
3890 From->removeUser(operandNum, U);
3893 To.Val->addUser(operandNum, U);
3896 // Now that we have modified U, add it back to the CSE maps. If it already
3897 // exists there, recursively merge the results together.
3898 if (SDNode *Existing = AddNonLeafNodeToCSEMaps(U)) {
3899 ReplaceAllUsesWith(U, Existing, UpdateListener);
3900 // U is now dead. Inform the listener if it exists and delete it.
3902 UpdateListener->NodeDeleted(U, Existing);
3903 DeleteNodeNotInCSEMaps(U);
3905 // If the node doesn't already exist, we updated it. Inform a listener if
3908 UpdateListener->NodeUpdated(U);
3913 /// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead.
3914 /// This can cause recursive merging of nodes in the DAG.
3916 /// This version assumes From/To have matching types and numbers of result
3919 void SelectionDAG::ReplaceAllUsesWith(SDNode *From, SDNode *To,
3920 DAGUpdateListener *UpdateListener) {
3921 assert(From != To && "Cannot replace uses of with self");
3922 assert(From->getNumValues() == To->getNumValues() &&
3923 "Cannot use this version of ReplaceAllUsesWith!");
3924 if (From->getNumValues() == 1) // If possible, use the faster version.
3925 return ReplaceAllUsesWith(SDOperand(From, 0), SDOperand(To, 0),
3928 while (!From->use_empty()) {
3929 SDNode::use_iterator UI = From->use_begin();
3930 SDNode *U = UI->getUser();
3932 // This node is about to morph, remove its old self from the CSE maps.
3933 RemoveNodeFromCSEMaps(U);
3935 for (SDNode::op_iterator I = U->op_begin(), E = U->op_end();
3936 I != E; ++I, ++operandNum)
3937 if (I->getVal() == From) {
3938 From->removeUser(operandNum, U);
3940 To->addUser(operandNum, U);
3943 // Now that we have modified U, add it back to the CSE maps. If it already
3944 // exists there, recursively merge the results together.
3945 if (SDNode *Existing = AddNonLeafNodeToCSEMaps(U)) {
3946 ReplaceAllUsesWith(U, Existing, UpdateListener);
3947 // U is now dead. Inform the listener if it exists and delete it.
3949 UpdateListener->NodeDeleted(U, Existing);
3950 DeleteNodeNotInCSEMaps(U);
3952 // If the node doesn't already exist, we updated it. Inform a listener if
3955 UpdateListener->NodeUpdated(U);
3960 /// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead.
3961 /// This can cause recursive merging of nodes in the DAG.
3963 /// This version can replace From with any result values. To must match the
3964 /// number and types of values returned by From.
3965 void SelectionDAG::ReplaceAllUsesWith(SDNode *From,
3967 DAGUpdateListener *UpdateListener) {
3968 if (From->getNumValues() == 1) // Handle the simple case efficiently.
3969 return ReplaceAllUsesWith(SDOperand(From, 0), To[0], UpdateListener);
3971 while (!From->use_empty()) {
3972 SDNode::use_iterator UI = From->use_begin();
3973 SDNode *U = UI->getUser();
3975 // This node is about to morph, remove its old self from the CSE maps.
3976 RemoveNodeFromCSEMaps(U);
3978 for (SDNode::op_iterator I = U->op_begin(), E = U->op_end();
3979 I != E; ++I, ++operandNum)
3980 if (I->getVal() == From) {
3981 const SDOperand &ToOp = To[I->getSDOperand().ResNo];
3982 From->removeUser(operandNum, U);
3985 ToOp.Val->addUser(operandNum, U);
3988 // Now that we have modified U, add it back to the CSE maps. If it already
3989 // exists there, recursively merge the results together.
3990 if (SDNode *Existing = AddNonLeafNodeToCSEMaps(U)) {
3991 ReplaceAllUsesWith(U, Existing, UpdateListener);
3992 // U is now dead. Inform the listener if it exists and delete it.
3994 UpdateListener->NodeDeleted(U, Existing);
3995 DeleteNodeNotInCSEMaps(U);
3997 // If the node doesn't already exist, we updated it. Inform a listener if
4000 UpdateListener->NodeUpdated(U);
4006 /// ChainedSetUpdaterListener - This class is a DAGUpdateListener that removes
4007 /// any deleted nodes from the set passed into its constructor and recursively
4008 /// notifies another update listener if specified.
4009 class ChainedSetUpdaterListener :
4010 public SelectionDAG::DAGUpdateListener {
4011 SmallSetVector<SDNode*, 16> &Set;
4012 SelectionDAG::DAGUpdateListener *Chain;
4014 ChainedSetUpdaterListener(SmallSetVector<SDNode*, 16> &set,
4015 SelectionDAG::DAGUpdateListener *chain)
4016 : Set(set), Chain(chain) {}
4018 virtual void NodeDeleted(SDNode *N, SDNode *E) {
4020 if (Chain) Chain->NodeDeleted(N, E);
4022 virtual void NodeUpdated(SDNode *N) {
4023 if (Chain) Chain->NodeUpdated(N);
4028 /// ReplaceAllUsesOfValueWith - Replace any uses of From with To, leaving
4029 /// uses of other values produced by From.Val alone. The Deleted vector is
4030 /// handled the same way as for ReplaceAllUsesWith.
4031 void SelectionDAG::ReplaceAllUsesOfValueWith(SDOperand From, SDOperand To,
4032 DAGUpdateListener *UpdateListener){
4033 assert(From != To && "Cannot replace a value with itself");
4035 // Handle the simple, trivial, case efficiently.
4036 if (From.Val->getNumValues() == 1) {
4037 ReplaceAllUsesWith(From, To, UpdateListener);
4041 if (From.use_empty()) return;
4043 // Get all of the users of From.Val. We want these in a nice,
4044 // deterministically ordered and uniqued set, so we use a SmallSetVector.
4045 SmallSetVector<SDNode*, 16> Users;
4046 for (SDNode::use_iterator UI = From.Val->use_begin(),
4047 E = From.Val->use_end(); UI != E; ++UI) {
4048 SDNode *User = UI->getUser();
4049 if (!Users.count(User))
4053 // When one of the recursive merges deletes nodes from the graph, we need to
4054 // make sure that UpdateListener is notified *and* that the node is removed
4055 // from Users if present. CSUL does this.
4056 ChainedSetUpdaterListener CSUL(Users, UpdateListener);
4058 while (!Users.empty()) {
4059 // We know that this user uses some value of From. If it is the right
4060 // value, update it.
4061 SDNode *User = Users.back();
4064 // Scan for an operand that matches From.
4065 SDNode::op_iterator Op = User->op_begin(), E = User->op_end();
4066 for (; Op != E; ++Op)
4067 if (*Op == From) break;
4069 // If there are no matches, the user must use some other result of From.
4070 if (Op == E) continue;
4072 // Okay, we know this user needs to be updated. Remove its old self
4073 // from the CSE maps.
4074 RemoveNodeFromCSEMaps(User);
4076 // Update all operands that match "From" in case there are multiple uses.
4077 for (; Op != E; ++Op) {
4079 From.Val->removeUser(Op-User->op_begin(), User);
4082 To.Val->addUser(Op-User->op_begin(), User);
4086 // Now that we have modified User, add it back to the CSE maps. If it
4087 // already exists there, recursively merge the results together.
4088 SDNode *Existing = AddNonLeafNodeToCSEMaps(User);
4090 if (UpdateListener) UpdateListener->NodeUpdated(User);
4091 continue; // Continue on to next user.
4094 // If there was already an existing matching node, use ReplaceAllUsesWith
4095 // to replace the dead one with the existing one. This can cause
4096 // recursive merging of other unrelated nodes down the line. The merging
4097 // can cause deletion of nodes that used the old value. To handle this, we
4098 // use CSUL to remove them from the Users set.
4099 ReplaceAllUsesWith(User, Existing, &CSUL);
4101 // User is now dead. Notify a listener if present.
4102 if (UpdateListener) UpdateListener->NodeDeleted(User, Existing);
4103 DeleteNodeNotInCSEMaps(User);
4107 /// AssignNodeIds - Assign a unique node id for each node in the DAG based on
4108 /// their allnodes order. It returns the maximum id.
4109 unsigned SelectionDAG::AssignNodeIds() {
4111 for (allnodes_iterator I = allnodes_begin(), E = allnodes_end(); I != E; ++I){
4118 /// AssignTopologicalOrder - Assign a unique node id for each node in the DAG
4119 /// based on their topological order. It returns the maximum id and a vector
4120 /// of the SDNodes* in assigned order by reference.
4121 unsigned SelectionDAG::AssignTopologicalOrder(std::vector<SDNode*> &TopOrder) {
4122 unsigned DAGSize = AllNodes.size();
4123 std::vector<unsigned> InDegree(DAGSize);
4124 std::vector<SDNode*> Sources;
4126 // Use a two pass approach to avoid using a std::map which is slow.
4128 for (allnodes_iterator I = allnodes_begin(),E = allnodes_end(); I != E; ++I){
4131 unsigned Degree = N->use_size();
4132 InDegree[N->getNodeId()] = Degree;
4134 Sources.push_back(N);
4138 while (!Sources.empty()) {
4139 SDNode *N = Sources.back();
4141 TopOrder.push_back(N);
4142 for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ++I) {
4143 SDNode *P = I->getVal();
4144 unsigned Degree = --InDegree[P->getNodeId()];
4146 Sources.push_back(P);
4150 // Second pass, assign the actual topological order as node ids.
4152 for (std::vector<SDNode*>::iterator TI = TopOrder.begin(),TE = TopOrder.end();
4154 (*TI)->setNodeId(Id++);
4161 //===----------------------------------------------------------------------===//
4163 //===----------------------------------------------------------------------===//
4165 // Out-of-line virtual method to give class a home.
4166 void SDNode::ANCHOR() {}
4167 void UnarySDNode::ANCHOR() {}
4168 void BinarySDNode::ANCHOR() {}
4169 void TernarySDNode::ANCHOR() {}
4170 void HandleSDNode::ANCHOR() {}
4171 void StringSDNode::ANCHOR() {}
4172 void ConstantSDNode::ANCHOR() {}
4173 void ConstantFPSDNode::ANCHOR() {}
4174 void GlobalAddressSDNode::ANCHOR() {}
4175 void FrameIndexSDNode::ANCHOR() {}
4176 void JumpTableSDNode::ANCHOR() {}
4177 void ConstantPoolSDNode::ANCHOR() {}
4178 void BasicBlockSDNode::ANCHOR() {}
4179 void SrcValueSDNode::ANCHOR() {}
4180 void MemOperandSDNode::ANCHOR() {}
4181 void RegisterSDNode::ANCHOR() {}
4182 void ExternalSymbolSDNode::ANCHOR() {}
4183 void CondCodeSDNode::ANCHOR() {}
4184 void ARG_FLAGSSDNode::ANCHOR() {}
4185 void VTSDNode::ANCHOR() {}
4186 void MemSDNode::ANCHOR() {}
4187 void LoadSDNode::ANCHOR() {}
4188 void StoreSDNode::ANCHOR() {}
4189 void AtomicSDNode::ANCHOR() {}
4191 HandleSDNode::~HandleSDNode() {
4192 SDVTList VTs = { 0, 0 };
4193 MorphNodeTo(ISD::HANDLENODE, VTs, SDOperandPtr(), 0); // Drops operand uses.
4196 GlobalAddressSDNode::GlobalAddressSDNode(bool isTarget, const GlobalValue *GA,
4198 : SDNode(isa<GlobalVariable>(GA) &&
4199 cast<GlobalVariable>(GA)->isThreadLocal() ?
4201 (isTarget ? ISD::TargetGlobalTLSAddress : ISD::GlobalTLSAddress) :
4203 (isTarget ? ISD::TargetGlobalAddress : ISD::GlobalAddress),
4204 getSDVTList(VT)), Offset(o) {
4205 TheGlobal = const_cast<GlobalValue*>(GA);
4208 /// getMemOperand - Return a MachineMemOperand object describing the memory
4209 /// reference performed by this atomic.
4210 MachineMemOperand AtomicSDNode::getMemOperand() const {
4211 int Size = (getValueType(0).getSizeInBits() + 7) >> 3;
4212 int Flags = MachineMemOperand::MOLoad | MachineMemOperand::MOStore;
4213 if (isVolatile()) Flags |= MachineMemOperand::MOVolatile;
4215 // Check if the atomic references a frame index
4216 const FrameIndexSDNode *FI =
4217 dyn_cast<const FrameIndexSDNode>(getBasePtr().Val);
4218 if (!getSrcValue() && FI)
4219 return MachineMemOperand(PseudoSourceValue::getFixedStack(), Flags,
4220 FI->getIndex(), Size, getAlignment());
4222 return MachineMemOperand(getSrcValue(), Flags, getSrcValueOffset(),
4223 Size, getAlignment());
4226 /// getMemOperand - Return a MachineMemOperand object describing the memory
4227 /// reference performed by this load or store.
4228 MachineMemOperand LSBaseSDNode::getMemOperand() const {
4229 int Size = (getMemoryVT().getSizeInBits() + 7) >> 3;
4231 getOpcode() == ISD::LOAD ? MachineMemOperand::MOLoad :
4232 MachineMemOperand::MOStore;
4233 if (isVolatile()) Flags |= MachineMemOperand::MOVolatile;
4235 // Check if the load references a frame index, and does not have
4237 const FrameIndexSDNode *FI =
4238 dyn_cast<const FrameIndexSDNode>(getBasePtr().Val);
4239 if (!getSrcValue() && FI)
4240 return MachineMemOperand(PseudoSourceValue::getFixedStack(), Flags,
4241 FI->getIndex(), Size, getAlignment());
4243 return MachineMemOperand(getSrcValue(), Flags,
4244 getSrcValueOffset(), Size, getAlignment());
4247 /// Profile - Gather unique data for the node.
4249 void SDNode::Profile(FoldingSetNodeID &ID) {
4250 AddNodeIDNode(ID, this);
4253 /// getValueTypeList - Return a pointer to the specified value type.
4255 const MVT *SDNode::getValueTypeList(MVT VT) {
4256 if (VT.isExtended()) {
4257 static std::set<MVT, MVT::compareRawBits> EVTs;
4258 return &(*EVTs.insert(VT).first);
4260 static MVT VTs[MVT::LAST_VALUETYPE];
4261 VTs[VT.getSimpleVT()] = VT;
4262 return &VTs[VT.getSimpleVT()];
4266 /// hasNUsesOfValue - Return true if there are exactly NUSES uses of the
4267 /// indicated value. This method ignores uses of other values defined by this
4269 bool SDNode::hasNUsesOfValue(unsigned NUses, unsigned Value) const {
4270 assert(Value < getNumValues() && "Bad value!");
4272 // If there is only one value, this is easy.
4273 if (getNumValues() == 1)
4274 return use_size() == NUses;
4275 if (use_size() < NUses) return false;
4277 SDOperand TheValue(const_cast<SDNode *>(this), Value);
4279 SmallPtrSet<SDNode*, 32> UsersHandled;
4281 // TODO: Only iterate over uses of a given value of the node
4282 for (SDNode::use_iterator UI = use_begin(), E = use_end(); UI != E; ++UI) {
4283 if (*UI == TheValue) {
4290 // Found exactly the right number of uses?
4295 /// hasAnyUseOfValue - Return true if there are any use of the indicated
4296 /// value. This method ignores uses of other values defined by this operation.
4297 bool SDNode::hasAnyUseOfValue(unsigned Value) const {
4298 assert(Value < getNumValues() && "Bad value!");
4300 if (use_empty()) return false;
4302 SDOperand TheValue(const_cast<SDNode *>(this), Value);
4304 SmallPtrSet<SDNode*, 32> UsersHandled;
4306 for (SDNode::use_iterator UI = use_begin(), E = use_end(); UI != E; ++UI) {
4307 SDNode *User = UI->getUser();
4308 if (User->getNumOperands() == 1 ||
4309 UsersHandled.insert(User)) // First time we've seen this?
4310 for (unsigned i = 0, e = User->getNumOperands(); i != e; ++i)
4311 if (User->getOperand(i) == TheValue) {
4320 /// isOnlyUseOf - Return true if this node is the only use of N.
4322 bool SDNode::isOnlyUseOf(SDNode *N) const {
4324 for (SDNode::use_iterator I = N->use_begin(), E = N->use_end(); I != E; ++I) {
4325 SDNode *User = I->getUser();
4335 /// isOperand - Return true if this node is an operand of N.
4337 bool SDOperand::isOperandOf(SDNode *N) const {
4338 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i)
4339 if (*this == N->getOperand(i))
4344 bool SDNode::isOperandOf(SDNode *N) const {
4345 for (unsigned i = 0, e = N->NumOperands; i != e; ++i)
4346 if (this == N->OperandList[i].getVal())
4351 /// reachesChainWithoutSideEffects - Return true if this operand (which must
4352 /// be a chain) reaches the specified operand without crossing any
4353 /// side-effecting instructions. In practice, this looks through token
4354 /// factors and non-volatile loads. In order to remain efficient, this only
4355 /// looks a couple of nodes in, it does not do an exhaustive search.
4356 bool SDOperand::reachesChainWithoutSideEffects(SDOperand Dest,
4357 unsigned Depth) const {
4358 if (*this == Dest) return true;
4360 // Don't search too deeply, we just want to be able to see through
4361 // TokenFactor's etc.
4362 if (Depth == 0) return false;
4364 // If this is a token factor, all inputs to the TF happen in parallel. If any
4365 // of the operands of the TF reach dest, then we can do the xform.
4366 if (getOpcode() == ISD::TokenFactor) {
4367 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
4368 if (getOperand(i).reachesChainWithoutSideEffects(Dest, Depth-1))
4373 // Loads don't have side effects, look through them.
4374 if (LoadSDNode *Ld = dyn_cast<LoadSDNode>(*this)) {
4375 if (!Ld->isVolatile())
4376 return Ld->getChain().reachesChainWithoutSideEffects(Dest, Depth-1);
4382 static void findPredecessor(SDNode *N, const SDNode *P, bool &found,
4383 SmallPtrSet<SDNode *, 32> &Visited) {
4384 if (found || !Visited.insert(N))
4387 for (unsigned i = 0, e = N->getNumOperands(); !found && i != e; ++i) {
4388 SDNode *Op = N->getOperand(i).Val;
4393 findPredecessor(Op, P, found, Visited);
4397 /// isPredecessorOf - Return true if this node is a predecessor of N. This node
4398 /// is either an operand of N or it can be reached by recursively traversing
4399 /// up the operands.
4400 /// NOTE: this is an expensive method. Use it carefully.
4401 bool SDNode::isPredecessorOf(SDNode *N) const {
4402 SmallPtrSet<SDNode *, 32> Visited;
4404 findPredecessor(N, this, found, Visited);
4408 uint64_t SDNode::getConstantOperandVal(unsigned Num) const {
4409 assert(Num < NumOperands && "Invalid child # of SDNode!");
4410 return cast<ConstantSDNode>(OperandList[Num])->getValue();
4413 std::string SDNode::getOperationName(const SelectionDAG *G) const {
4414 switch (getOpcode()) {
4416 if (getOpcode() < ISD::BUILTIN_OP_END)
4417 return "<<Unknown DAG Node>>";
4420 if (const TargetInstrInfo *TII = G->getTarget().getInstrInfo())
4421 if (getOpcode()-ISD::BUILTIN_OP_END < TII->getNumOpcodes())
4422 return TII->get(getOpcode()-ISD::BUILTIN_OP_END).getName();
4424 TargetLowering &TLI = G->getTargetLoweringInfo();
4426 TLI.getTargetNodeName(getOpcode());
4427 if (Name) return Name;
4430 return "<<Unknown Target Node>>";
4433 case ISD::PREFETCH: return "Prefetch";
4434 case ISD::MEMBARRIER: return "MemBarrier";
4435 case ISD::ATOMIC_CMP_SWAP: return "AtomicCmpSwap";
4436 case ISD::ATOMIC_LOAD_ADD: return "AtomicLoadAdd";
4437 case ISD::ATOMIC_LOAD_SUB: return "AtomicLoadSub";
4438 case ISD::ATOMIC_LOAD_AND: return "AtomicLoadAnd";
4439 case ISD::ATOMIC_LOAD_OR: return "AtomicLoadOr";
4440 case ISD::ATOMIC_LOAD_XOR: return "AtomicLoadXor";
4441 case ISD::ATOMIC_LOAD_NAND: return "AtomicLoadNand";
4442 case ISD::ATOMIC_LOAD_MIN: return "AtomicLoadMin";
4443 case ISD::ATOMIC_LOAD_MAX: return "AtomicLoadMax";
4444 case ISD::ATOMIC_LOAD_UMIN: return "AtomicLoadUMin";
4445 case ISD::ATOMIC_LOAD_UMAX: return "AtomicLoadUMax";
4446 case ISD::ATOMIC_SWAP: return "AtomicSWAP";
4447 case ISD::PCMARKER: return "PCMarker";
4448 case ISD::READCYCLECOUNTER: return "ReadCycleCounter";
4449 case ISD::SRCVALUE: return "SrcValue";
4450 case ISD::MEMOPERAND: return "MemOperand";
4451 case ISD::EntryToken: return "EntryToken";
4452 case ISD::TokenFactor: return "TokenFactor";
4453 case ISD::AssertSext: return "AssertSext";
4454 case ISD::AssertZext: return "AssertZext";
4456 case ISD::STRING: return "String";
4457 case ISD::BasicBlock: return "BasicBlock";
4458 case ISD::ARG_FLAGS: return "ArgFlags";
4459 case ISD::VALUETYPE: return "ValueType";
4460 case ISD::Register: return "Register";
4462 case ISD::Constant: return "Constant";
4463 case ISD::ConstantFP: return "ConstantFP";
4464 case ISD::GlobalAddress: return "GlobalAddress";
4465 case ISD::GlobalTLSAddress: return "GlobalTLSAddress";
4466 case ISD::FrameIndex: return "FrameIndex";
4467 case ISD::JumpTable: return "JumpTable";
4468 case ISD::GLOBAL_OFFSET_TABLE: return "GLOBAL_OFFSET_TABLE";
4469 case ISD::RETURNADDR: return "RETURNADDR";
4470 case ISD::FRAMEADDR: return "FRAMEADDR";
4471 case ISD::FRAME_TO_ARGS_OFFSET: return "FRAME_TO_ARGS_OFFSET";
4472 case ISD::EXCEPTIONADDR: return "EXCEPTIONADDR";
4473 case ISD::EHSELECTION: return "EHSELECTION";
4474 case ISD::EH_RETURN: return "EH_RETURN";
4475 case ISD::ConstantPool: return "ConstantPool";
4476 case ISD::ExternalSymbol: return "ExternalSymbol";
4477 case ISD::INTRINSIC_WO_CHAIN: {
4478 unsigned IID = cast<ConstantSDNode>(getOperand(0))->getValue();
4479 return Intrinsic::getName((Intrinsic::ID)IID);
4481 case ISD::INTRINSIC_VOID:
4482 case ISD::INTRINSIC_W_CHAIN: {
4483 unsigned IID = cast<ConstantSDNode>(getOperand(1))->getValue();
4484 return Intrinsic::getName((Intrinsic::ID)IID);
4487 case ISD::BUILD_VECTOR: return "BUILD_VECTOR";
4488 case ISD::TargetConstant: return "TargetConstant";
4489 case ISD::TargetConstantFP:return "TargetConstantFP";
4490 case ISD::TargetGlobalAddress: return "TargetGlobalAddress";
4491 case ISD::TargetGlobalTLSAddress: return "TargetGlobalTLSAddress";
4492 case ISD::TargetFrameIndex: return "TargetFrameIndex";
4493 case ISD::TargetJumpTable: return "TargetJumpTable";
4494 case ISD::TargetConstantPool: return "TargetConstantPool";
4495 case ISD::TargetExternalSymbol: return "TargetExternalSymbol";
4497 case ISD::CopyToReg: return "CopyToReg";
4498 case ISD::CopyFromReg: return "CopyFromReg";
4499 case ISD::UNDEF: return "undef";
4500 case ISD::MERGE_VALUES: return "merge_values";
4501 case ISD::INLINEASM: return "inlineasm";
4502 case ISD::LABEL: return "label";
4503 case ISD::DECLARE: return "declare";
4504 case ISD::HANDLENODE: return "handlenode";
4505 case ISD::FORMAL_ARGUMENTS: return "formal_arguments";
4506 case ISD::CALL: return "call";
4509 case ISD::FABS: return "fabs";
4510 case ISD::FNEG: return "fneg";
4511 case ISD::FSQRT: return "fsqrt";
4512 case ISD::FSIN: return "fsin";
4513 case ISD::FCOS: return "fcos";
4514 case ISD::FPOWI: return "fpowi";
4515 case ISD::FPOW: return "fpow";
4518 case ISD::ADD: return "add";
4519 case ISD::SUB: return "sub";
4520 case ISD::MUL: return "mul";
4521 case ISD::MULHU: return "mulhu";
4522 case ISD::MULHS: return "mulhs";
4523 case ISD::SDIV: return "sdiv";
4524 case ISD::UDIV: return "udiv";
4525 case ISD::SREM: return "srem";
4526 case ISD::UREM: return "urem";
4527 case ISD::SMUL_LOHI: return "smul_lohi";
4528 case ISD::UMUL_LOHI: return "umul_lohi";
4529 case ISD::SDIVREM: return "sdivrem";
4530 case ISD::UDIVREM: return "divrem";
4531 case ISD::AND: return "and";
4532 case ISD::OR: return "or";
4533 case ISD::XOR: return "xor";
4534 case ISD::SHL: return "shl";
4535 case ISD::SRA: return "sra";
4536 case ISD::SRL: return "srl";
4537 case ISD::ROTL: return "rotl";
4538 case ISD::ROTR: return "rotr";
4539 case ISD::FADD: return "fadd";
4540 case ISD::FSUB: return "fsub";
4541 case ISD::FMUL: return "fmul";
4542 case ISD::FDIV: return "fdiv";
4543 case ISD::FREM: return "frem";
4544 case ISD::FCOPYSIGN: return "fcopysign";
4545 case ISD::FGETSIGN: return "fgetsign";
4547 case ISD::SETCC: return "setcc";
4548 case ISD::VSETCC: return "vsetcc";
4549 case ISD::SELECT: return "select";
4550 case ISD::SELECT_CC: return "select_cc";
4551 case ISD::INSERT_VECTOR_ELT: return "insert_vector_elt";
4552 case ISD::EXTRACT_VECTOR_ELT: return "extract_vector_elt";
4553 case ISD::CONCAT_VECTORS: return "concat_vectors";
4554 case ISD::EXTRACT_SUBVECTOR: return "extract_subvector";
4555 case ISD::SCALAR_TO_VECTOR: return "scalar_to_vector";
4556 case ISD::VECTOR_SHUFFLE: return "vector_shuffle";
4557 case ISD::CARRY_FALSE: return "carry_false";
4558 case ISD::ADDC: return "addc";
4559 case ISD::ADDE: return "adde";
4560 case ISD::SUBC: return "subc";
4561 case ISD::SUBE: return "sube";
4562 case ISD::SHL_PARTS: return "shl_parts";
4563 case ISD::SRA_PARTS: return "sra_parts";
4564 case ISD::SRL_PARTS: return "srl_parts";
4566 case ISD::EXTRACT_SUBREG: return "extract_subreg";
4567 case ISD::INSERT_SUBREG: return "insert_subreg";
4569 // Conversion operators.
4570 case ISD::SIGN_EXTEND: return "sign_extend";
4571 case ISD::ZERO_EXTEND: return "zero_extend";
4572 case ISD::ANY_EXTEND: return "any_extend";
4573 case ISD::SIGN_EXTEND_INREG: return "sign_extend_inreg";
4574 case ISD::TRUNCATE: return "truncate";
4575 case ISD::FP_ROUND: return "fp_round";
4576 case ISD::FLT_ROUNDS_: return "flt_rounds";
4577 case ISD::FP_ROUND_INREG: return "fp_round_inreg";
4578 case ISD::FP_EXTEND: return "fp_extend";
4580 case ISD::SINT_TO_FP: return "sint_to_fp";
4581 case ISD::UINT_TO_FP: return "uint_to_fp";
4582 case ISD::FP_TO_SINT: return "fp_to_sint";
4583 case ISD::FP_TO_UINT: return "fp_to_uint";
4584 case ISD::BIT_CONVERT: return "bit_convert";
4586 // Control flow instructions
4587 case ISD::BR: return "br";
4588 case ISD::BRIND: return "brind";
4589 case ISD::BR_JT: return "br_jt";
4590 case ISD::BRCOND: return "brcond";
4591 case ISD::BR_CC: return "br_cc";
4592 case ISD::RET: return "ret";
4593 case ISD::CALLSEQ_START: return "callseq_start";
4594 case ISD::CALLSEQ_END: return "callseq_end";
4597 case ISD::LOAD: return "load";
4598 case ISD::STORE: return "store";
4599 case ISD::VAARG: return "vaarg";
4600 case ISD::VACOPY: return "vacopy";
4601 case ISD::VAEND: return "vaend";
4602 case ISD::VASTART: return "vastart";
4603 case ISD::DYNAMIC_STACKALLOC: return "dynamic_stackalloc";
4604 case ISD::EXTRACT_ELEMENT: return "extract_element";
4605 case ISD::BUILD_PAIR: return "build_pair";
4606 case ISD::STACKSAVE: return "stacksave";
4607 case ISD::STACKRESTORE: return "stackrestore";
4608 case ISD::TRAP: return "trap";
4611 case ISD::BSWAP: return "bswap";
4612 case ISD::CTPOP: return "ctpop";
4613 case ISD::CTTZ: return "cttz";
4614 case ISD::CTLZ: return "ctlz";
4617 case ISD::LOCATION: return "location";
4618 case ISD::DEBUG_LOC: return "debug_loc";
4621 case ISD::TRAMPOLINE: return "trampoline";
4624 switch (cast<CondCodeSDNode>(this)->get()) {
4625 default: assert(0 && "Unknown setcc condition!");
4626 case ISD::SETOEQ: return "setoeq";
4627 case ISD::SETOGT: return "setogt";
4628 case ISD::SETOGE: return "setoge";
4629 case ISD::SETOLT: return "setolt";
4630 case ISD::SETOLE: return "setole";
4631 case ISD::SETONE: return "setone";
4633 case ISD::SETO: return "seto";
4634 case ISD::SETUO: return "setuo";
4635 case ISD::SETUEQ: return "setue";
4636 case ISD::SETUGT: return "setugt";
4637 case ISD::SETUGE: return "setuge";
4638 case ISD::SETULT: return "setult";
4639 case ISD::SETULE: return "setule";
4640 case ISD::SETUNE: return "setune";
4642 case ISD::SETEQ: return "seteq";
4643 case ISD::SETGT: return "setgt";
4644 case ISD::SETGE: return "setge";
4645 case ISD::SETLT: return "setlt";
4646 case ISD::SETLE: return "setle";
4647 case ISD::SETNE: return "setne";
4652 const char *SDNode::getIndexedModeName(ISD::MemIndexedMode AM) {
4661 return "<post-inc>";
4663 return "<post-dec>";
4667 std::string ISD::ArgFlagsTy::getArgFlagsString() {
4668 std::string S = "< ";
4682 if (getByValAlign())
4683 S += "byval-align:" + utostr(getByValAlign()) + " ";
4685 S += "orig-align:" + utostr(getOrigAlign()) + " ";
4687 S += "byval-size:" + utostr(getByValSize()) + " ";
4691 void SDNode::dump() const { dump(0); }
4692 void SDNode::dump(const SelectionDAG *G) const {
4693 cerr << (void*)this << ": ";
4695 for (unsigned i = 0, e = getNumValues(); i != e; ++i) {
4697 if (getValueType(i) == MVT::Other)
4700 cerr << getValueType(i).getMVTString();
4702 cerr << " = " << getOperationName(G);
4705 for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
4706 if (i) cerr << ", ";
4707 cerr << (void*)getOperand(i).Val;
4708 if (unsigned RN = getOperand(i).ResNo)
4712 if (!isTargetOpcode() && getOpcode() == ISD::VECTOR_SHUFFLE) {
4713 SDNode *Mask = getOperand(2).Val;
4715 for (unsigned i = 0, e = Mask->getNumOperands(); i != e; ++i) {
4717 if (Mask->getOperand(i).getOpcode() == ISD::UNDEF)
4720 cerr << cast<ConstantSDNode>(Mask->getOperand(i))->getValue();
4725 if (const ConstantSDNode *CSDN = dyn_cast<ConstantSDNode>(this)) {
4726 cerr << "<" << CSDN->getValue() << ">";
4727 } else if (const ConstantFPSDNode *CSDN = dyn_cast<ConstantFPSDNode>(this)) {
4728 if (&CSDN->getValueAPF().getSemantics()==&APFloat::IEEEsingle)
4729 cerr << "<" << CSDN->getValueAPF().convertToFloat() << ">";
4730 else if (&CSDN->getValueAPF().getSemantics()==&APFloat::IEEEdouble)
4731 cerr << "<" << CSDN->getValueAPF().convertToDouble() << ">";
4733 cerr << "<APFloat(";
4734 CSDN->getValueAPF().convertToAPInt().dump();
4737 } else if (const GlobalAddressSDNode *GADN =
4738 dyn_cast<GlobalAddressSDNode>(this)) {
4739 int offset = GADN->getOffset();
4741 WriteAsOperand(*cerr.stream(), GADN->getGlobal()) << ">";
4743 cerr << " + " << offset;
4745 cerr << " " << offset;
4746 } else if (const FrameIndexSDNode *FIDN = dyn_cast<FrameIndexSDNode>(this)) {
4747 cerr << "<" << FIDN->getIndex() << ">";
4748 } else if (const JumpTableSDNode *JTDN = dyn_cast<JumpTableSDNode>(this)) {
4749 cerr << "<" << JTDN->getIndex() << ">";
4750 } else if (const ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(this)){
4751 int offset = CP->getOffset();
4752 if (CP->isMachineConstantPoolEntry())
4753 cerr << "<" << *CP->getMachineCPVal() << ">";
4755 cerr << "<" << *CP->getConstVal() << ">";
4757 cerr << " + " << offset;
4759 cerr << " " << offset;
4760 } else if (const BasicBlockSDNode *BBDN = dyn_cast<BasicBlockSDNode>(this)) {
4762 const Value *LBB = (const Value*)BBDN->getBasicBlock()->getBasicBlock();
4764 cerr << LBB->getName() << " ";
4765 cerr << (const void*)BBDN->getBasicBlock() << ">";
4766 } else if (const RegisterSDNode *R = dyn_cast<RegisterSDNode>(this)) {
4767 if (G && R->getReg() &&
4768 TargetRegisterInfo::isPhysicalRegister(R->getReg())) {
4769 cerr << " " << G->getTarget().getRegisterInfo()->getName(R->getReg());
4771 cerr << " #" << R->getReg();
4773 } else if (const ExternalSymbolSDNode *ES =
4774 dyn_cast<ExternalSymbolSDNode>(this)) {
4775 cerr << "'" << ES->getSymbol() << "'";
4776 } else if (const SrcValueSDNode *M = dyn_cast<SrcValueSDNode>(this)) {
4778 cerr << "<" << M->getValue() << ">";
4781 } else if (const MemOperandSDNode *M = dyn_cast<MemOperandSDNode>(this)) {
4782 if (M->MO.getValue())
4783 cerr << "<" << M->MO.getValue() << ":" << M->MO.getOffset() << ">";
4785 cerr << "<null:" << M->MO.getOffset() << ">";
4786 } else if (const ARG_FLAGSSDNode *N = dyn_cast<ARG_FLAGSSDNode>(this)) {
4787 cerr << N->getArgFlags().getArgFlagsString();
4788 } else if (const VTSDNode *N = dyn_cast<VTSDNode>(this)) {
4789 cerr << ":" << N->getVT().getMVTString();
4791 else if (const LoadSDNode *LD = dyn_cast<LoadSDNode>(this)) {
4792 const Value *SrcValue = LD->getSrcValue();
4793 int SrcOffset = LD->getSrcValueOffset();
4799 cerr << ":" << SrcOffset << ">";
4802 switch (LD->getExtensionType()) {
4803 default: doExt = false; break;
4805 cerr << " <anyext ";
4815 cerr << LD->getMemoryVT().getMVTString() << ">";
4817 const char *AM = getIndexedModeName(LD->getAddressingMode());
4820 if (LD->isVolatile())
4821 cerr << " <volatile>";
4822 cerr << " alignment=" << LD->getAlignment();
4823 } else if (const StoreSDNode *ST = dyn_cast<StoreSDNode>(this)) {
4824 const Value *SrcValue = ST->getSrcValue();
4825 int SrcOffset = ST->getSrcValueOffset();
4831 cerr << ":" << SrcOffset << ">";
4833 if (ST->isTruncatingStore())
4835 << ST->getMemoryVT().getMVTString() << ">";
4837 const char *AM = getIndexedModeName(ST->getAddressingMode());
4840 if (ST->isVolatile())
4841 cerr << " <volatile>";
4842 cerr << " alignment=" << ST->getAlignment();
4843 } else if (const AtomicSDNode* AT = dyn_cast<AtomicSDNode>(this)) {
4844 const Value *SrcValue = AT->getSrcValue();
4845 int SrcOffset = AT->getSrcValueOffset();
4851 cerr << ":" << SrcOffset << ">";
4852 if (AT->isVolatile())
4853 cerr << " <volatile>";
4854 cerr << " alignment=" << AT->getAlignment();
4858 static void DumpNodes(const SDNode *N, unsigned indent, const SelectionDAG *G) {
4859 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i)
4860 if (N->getOperand(i).Val->hasOneUse())
4861 DumpNodes(N->getOperand(i).Val, indent+2, G);
4863 cerr << "\n" << std::string(indent+2, ' ')
4864 << (void*)N->getOperand(i).Val << ": <multiple use>";
4867 cerr << "\n" << std::string(indent, ' ');
4871 void SelectionDAG::dump() const {
4872 cerr << "SelectionDAG has " << AllNodes.size() << " nodes:";
4873 std::vector<const SDNode*> Nodes;
4874 for (allnodes_const_iterator I = allnodes_begin(), E = allnodes_end();
4878 std::sort(Nodes.begin(), Nodes.end());
4880 for (unsigned i = 0, e = Nodes.size(); i != e; ++i) {
4881 if (!Nodes[i]->hasOneUse() && Nodes[i] != getRoot().Val)
4882 DumpNodes(Nodes[i], 2, this);
4885 if (getRoot().Val) DumpNodes(getRoot().Val, 2, this);
4890 const Type *ConstantPoolSDNode::getType() const {
4891 if (isMachineConstantPoolEntry())
4892 return Val.MachineCPVal->getType();
4893 return Val.ConstVal->getType();