1 //===-- SelectionDAG.cpp - Implement the SelectionDAG data structures -----===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This implements the SelectionDAG class.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/CodeGen/SelectionDAG.h"
15 #include "SDNodeOrdering.h"
16 #include "SDNodeDbgValue.h"
17 #include "llvm/CallingConv.h"
18 #include "llvm/Constants.h"
19 #include "llvm/DebugInfo.h"
20 #include "llvm/DerivedTypes.h"
21 #include "llvm/Function.h"
22 #include "llvm/GlobalAlias.h"
23 #include "llvm/GlobalVariable.h"
24 #include "llvm/Intrinsics.h"
25 #include "llvm/Analysis/ValueTracking.h"
26 #include "llvm/Assembly/Writer.h"
27 #include "llvm/CodeGen/MachineBasicBlock.h"
28 #include "llvm/CodeGen/MachineConstantPool.h"
29 #include "llvm/CodeGen/MachineFrameInfo.h"
30 #include "llvm/CodeGen/MachineModuleInfo.h"
31 #include "llvm/Target/TargetRegisterInfo.h"
32 #include "llvm/DataLayout.h"
33 #include "llvm/Target/TargetLowering.h"
34 #include "llvm/Target/TargetSelectionDAGInfo.h"
35 #include "llvm/Target/TargetOptions.h"
36 #include "llvm/Target/TargetInstrInfo.h"
37 #include "llvm/Target/TargetIntrinsicInfo.h"
38 #include "llvm/Target/TargetMachine.h"
39 #include "llvm/Support/CommandLine.h"
40 #include "llvm/Support/Debug.h"
41 #include "llvm/Support/ErrorHandling.h"
42 #include "llvm/Support/ManagedStatic.h"
43 #include "llvm/Support/MathExtras.h"
44 #include "llvm/Support/raw_ostream.h"
45 #include "llvm/Support/Mutex.h"
46 #include "llvm/ADT/SetVector.h"
47 #include "llvm/ADT/SmallPtrSet.h"
48 #include "llvm/ADT/SmallSet.h"
49 #include "llvm/ADT/SmallVector.h"
50 #include "llvm/ADT/StringExtras.h"
55 /// makeVTList - Return an instance of the SDVTList struct initialized with the
56 /// specified members.
57 static SDVTList makeVTList(const EVT *VTs, unsigned NumVTs) {
58 SDVTList Res = {VTs, NumVTs};
62 static const fltSemantics *EVTToAPFloatSemantics(EVT VT) {
63 switch (VT.getSimpleVT().SimpleTy) {
64 default: llvm_unreachable("Unknown FP format");
65 case MVT::f16: return &APFloat::IEEEhalf;
66 case MVT::f32: return &APFloat::IEEEsingle;
67 case MVT::f64: return &APFloat::IEEEdouble;
68 case MVT::f80: return &APFloat::x87DoubleExtended;
69 case MVT::f128: return &APFloat::IEEEquad;
70 case MVT::ppcf128: return &APFloat::PPCDoubleDouble;
74 // Default null implementations of the callbacks.
75 void SelectionDAG::DAGUpdateListener::NodeDeleted(SDNode*, SDNode*) {}
76 void SelectionDAG::DAGUpdateListener::NodeUpdated(SDNode*) {}
78 //===----------------------------------------------------------------------===//
79 // ConstantFPSDNode Class
80 //===----------------------------------------------------------------------===//
82 /// isExactlyValue - We don't rely on operator== working on double values, as
83 /// it returns true for things that are clearly not equal, like -0.0 and 0.0.
84 /// As such, this method can be used to do an exact bit-for-bit comparison of
85 /// two floating point values.
86 bool ConstantFPSDNode::isExactlyValue(const APFloat& V) const {
87 return getValueAPF().bitwiseIsEqual(V);
90 bool ConstantFPSDNode::isValueValidForType(EVT VT,
92 assert(VT.isFloatingPoint() && "Can only convert between FP types");
94 // PPC long double cannot be converted to any other type.
95 if (VT == MVT::ppcf128 ||
96 &Val.getSemantics() == &APFloat::PPCDoubleDouble)
99 // convert modifies in place, so make a copy.
100 APFloat Val2 = APFloat(Val);
102 (void) Val2.convert(*EVTToAPFloatSemantics(VT), APFloat::rmNearestTiesToEven,
107 //===----------------------------------------------------------------------===//
109 //===----------------------------------------------------------------------===//
111 /// isBuildVectorAllOnes - Return true if the specified node is a
112 /// BUILD_VECTOR where all of the elements are ~0 or undef.
113 bool ISD::isBuildVectorAllOnes(const SDNode *N) {
114 // Look through a bit convert.
115 if (N->getOpcode() == ISD::BITCAST)
116 N = N->getOperand(0).getNode();
118 if (N->getOpcode() != ISD::BUILD_VECTOR) return false;
120 unsigned i = 0, e = N->getNumOperands();
122 // Skip over all of the undef values.
123 while (i != e && N->getOperand(i).getOpcode() == ISD::UNDEF)
126 // Do not accept an all-undef vector.
127 if (i == e) return false;
129 // Do not accept build_vectors that aren't all constants or which have non-~0
130 // elements. We have to be a bit careful here, as the type of the constant
131 // may not be the same as the type of the vector elements due to type
132 // legalization (the elements are promoted to a legal type for the target and
133 // a vector of a type may be legal when the base element type is not).
134 // We only want to check enough bits to cover the vector elements, because
135 // we care if the resultant vector is all ones, not whether the individual
137 SDValue NotZero = N->getOperand(i);
138 unsigned EltSize = N->getValueType(0).getVectorElementType().getSizeInBits();
139 if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(NotZero)) {
140 if (CN->getAPIntValue().countTrailingOnes() < EltSize)
142 } else if (ConstantFPSDNode *CFPN = dyn_cast<ConstantFPSDNode>(NotZero)) {
143 if (CFPN->getValueAPF().bitcastToAPInt().countTrailingOnes() < EltSize)
148 // Okay, we have at least one ~0 value, check to see if the rest match or are
149 // undefs. Even with the above element type twiddling, this should be OK, as
150 // the same type legalization should have applied to all the elements.
151 for (++i; i != e; ++i)
152 if (N->getOperand(i) != NotZero &&
153 N->getOperand(i).getOpcode() != ISD::UNDEF)
159 /// isBuildVectorAllZeros - Return true if the specified node is a
160 /// BUILD_VECTOR where all of the elements are 0 or undef.
161 bool ISD::isBuildVectorAllZeros(const SDNode *N) {
162 // Look through a bit convert.
163 if (N->getOpcode() == ISD::BITCAST)
164 N = N->getOperand(0).getNode();
166 if (N->getOpcode() != ISD::BUILD_VECTOR) return false;
168 unsigned i = 0, e = N->getNumOperands();
170 // Skip over all of the undef values.
171 while (i != e && N->getOperand(i).getOpcode() == ISD::UNDEF)
174 // Do not accept an all-undef vector.
175 if (i == e) return false;
177 // Do not accept build_vectors that aren't all constants or which have non-0
179 SDValue Zero = N->getOperand(i);
180 if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(Zero)) {
181 if (!CN->isNullValue())
183 } else if (ConstantFPSDNode *CFPN = dyn_cast<ConstantFPSDNode>(Zero)) {
184 if (!CFPN->getValueAPF().isPosZero())
189 // Okay, we have at least one 0 value, check to see if the rest match or are
191 for (++i; i != e; ++i)
192 if (N->getOperand(i) != Zero &&
193 N->getOperand(i).getOpcode() != ISD::UNDEF)
198 /// isScalarToVector - Return true if the specified node is a
199 /// ISD::SCALAR_TO_VECTOR node or a BUILD_VECTOR node where only the low
200 /// element is not an undef.
201 bool ISD::isScalarToVector(const SDNode *N) {
202 if (N->getOpcode() == ISD::SCALAR_TO_VECTOR)
205 if (N->getOpcode() != ISD::BUILD_VECTOR)
207 if (N->getOperand(0).getOpcode() == ISD::UNDEF)
209 unsigned NumElems = N->getNumOperands();
212 for (unsigned i = 1; i < NumElems; ++i) {
213 SDValue V = N->getOperand(i);
214 if (V.getOpcode() != ISD::UNDEF)
220 /// allOperandsUndef - Return true if the node has at least one operand
221 /// and all operands of the specified node are ISD::UNDEF.
222 bool ISD::allOperandsUndef(const SDNode *N) {
223 // Return false if the node has no operands.
224 // This is "logically inconsistent" with the definition of "all" but
225 // is probably the desired behavior.
226 if (N->getNumOperands() == 0)
229 for (unsigned i = 0, e = N->getNumOperands(); i != e ; ++i)
230 if (N->getOperand(i).getOpcode() != ISD::UNDEF)
236 /// getSetCCSwappedOperands - Return the operation corresponding to (Y op X)
237 /// when given the operation for (X op Y).
238 ISD::CondCode ISD::getSetCCSwappedOperands(ISD::CondCode Operation) {
239 // To perform this operation, we just need to swap the L and G bits of the
241 unsigned OldL = (Operation >> 2) & 1;
242 unsigned OldG = (Operation >> 1) & 1;
243 return ISD::CondCode((Operation & ~6) | // Keep the N, U, E bits
244 (OldL << 1) | // New G bit
245 (OldG << 2)); // New L bit.
248 /// getSetCCInverse - Return the operation corresponding to !(X op Y), where
249 /// 'op' is a valid SetCC operation.
250 ISD::CondCode ISD::getSetCCInverse(ISD::CondCode Op, bool isInteger) {
251 unsigned Operation = Op;
253 Operation ^= 7; // Flip L, G, E bits, but not U.
255 Operation ^= 15; // Flip all of the condition bits.
257 if (Operation > ISD::SETTRUE2)
258 Operation &= ~8; // Don't let N and U bits get set.
260 return ISD::CondCode(Operation);
264 /// isSignedOp - For an integer comparison, return 1 if the comparison is a
265 /// signed operation and 2 if the result is an unsigned comparison. Return zero
266 /// if the operation does not depend on the sign of the input (setne and seteq).
267 static int isSignedOp(ISD::CondCode Opcode) {
269 default: llvm_unreachable("Illegal integer setcc operation!");
271 case ISD::SETNE: return 0;
275 case ISD::SETGE: return 1;
279 case ISD::SETUGE: return 2;
283 /// getSetCCOrOperation - Return the result of a logical OR between different
284 /// comparisons of identical values: ((X op1 Y) | (X op2 Y)). This function
285 /// returns SETCC_INVALID if it is not possible to represent the resultant
287 ISD::CondCode ISD::getSetCCOrOperation(ISD::CondCode Op1, ISD::CondCode Op2,
289 if (isInteger && (isSignedOp(Op1) | isSignedOp(Op2)) == 3)
290 // Cannot fold a signed integer setcc with an unsigned integer setcc.
291 return ISD::SETCC_INVALID;
293 unsigned Op = Op1 | Op2; // Combine all of the condition bits.
295 // If the N and U bits get set then the resultant comparison DOES suddenly
296 // care about orderedness, and is true when ordered.
297 if (Op > ISD::SETTRUE2)
298 Op &= ~16; // Clear the U bit if the N bit is set.
300 // Canonicalize illegal integer setcc's.
301 if (isInteger && Op == ISD::SETUNE) // e.g. SETUGT | SETULT
304 return ISD::CondCode(Op);
307 /// getSetCCAndOperation - Return the result of a logical AND between different
308 /// comparisons of identical values: ((X op1 Y) & (X op2 Y)). This
309 /// function returns zero if it is not possible to represent the resultant
311 ISD::CondCode ISD::getSetCCAndOperation(ISD::CondCode Op1, ISD::CondCode Op2,
313 if (isInteger && (isSignedOp(Op1) | isSignedOp(Op2)) == 3)
314 // Cannot fold a signed setcc with an unsigned setcc.
315 return ISD::SETCC_INVALID;
317 // Combine all of the condition bits.
318 ISD::CondCode Result = ISD::CondCode(Op1 & Op2);
320 // Canonicalize illegal integer setcc's.
324 case ISD::SETUO : Result = ISD::SETFALSE; break; // SETUGT & SETULT
325 case ISD::SETOEQ: // SETEQ & SETU[LG]E
326 case ISD::SETUEQ: Result = ISD::SETEQ ; break; // SETUGE & SETULE
327 case ISD::SETOLT: Result = ISD::SETULT ; break; // SETULT & SETNE
328 case ISD::SETOGT: Result = ISD::SETUGT ; break; // SETUGT & SETNE
335 //===----------------------------------------------------------------------===//
336 // SDNode Profile Support
337 //===----------------------------------------------------------------------===//
339 /// AddNodeIDOpcode - Add the node opcode to the NodeID data.
341 static void AddNodeIDOpcode(FoldingSetNodeID &ID, unsigned OpC) {
345 /// AddNodeIDValueTypes - Value type lists are intern'd so we can represent them
346 /// solely with their pointer.
347 static void AddNodeIDValueTypes(FoldingSetNodeID &ID, SDVTList VTList) {
348 ID.AddPointer(VTList.VTs);
351 /// AddNodeIDOperands - Various routines for adding operands to the NodeID data.
353 static void AddNodeIDOperands(FoldingSetNodeID &ID,
354 const SDValue *Ops, unsigned NumOps) {
355 for (; NumOps; --NumOps, ++Ops) {
356 ID.AddPointer(Ops->getNode());
357 ID.AddInteger(Ops->getResNo());
361 /// AddNodeIDOperands - Various routines for adding operands to the NodeID data.
363 static void AddNodeIDOperands(FoldingSetNodeID &ID,
364 const SDUse *Ops, unsigned NumOps) {
365 for (; NumOps; --NumOps, ++Ops) {
366 ID.AddPointer(Ops->getNode());
367 ID.AddInteger(Ops->getResNo());
371 static void AddNodeIDNode(FoldingSetNodeID &ID,
372 unsigned short OpC, SDVTList VTList,
373 const SDValue *OpList, unsigned N) {
374 AddNodeIDOpcode(ID, OpC);
375 AddNodeIDValueTypes(ID, VTList);
376 AddNodeIDOperands(ID, OpList, N);
379 /// AddNodeIDCustom - If this is an SDNode with special info, add this info to
381 static void AddNodeIDCustom(FoldingSetNodeID &ID, const SDNode *N) {
382 switch (N->getOpcode()) {
383 case ISD::TargetExternalSymbol:
384 case ISD::ExternalSymbol:
385 llvm_unreachable("Should only be used on nodes with operands");
386 default: break; // Normal nodes don't need extra info.
387 case ISD::TargetConstant:
389 ID.AddPointer(cast<ConstantSDNode>(N)->getConstantIntValue());
391 case ISD::TargetConstantFP:
392 case ISD::ConstantFP: {
393 ID.AddPointer(cast<ConstantFPSDNode>(N)->getConstantFPValue());
396 case ISD::TargetGlobalAddress:
397 case ISD::GlobalAddress:
398 case ISD::TargetGlobalTLSAddress:
399 case ISD::GlobalTLSAddress: {
400 const GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(N);
401 ID.AddPointer(GA->getGlobal());
402 ID.AddInteger(GA->getOffset());
403 ID.AddInteger(GA->getTargetFlags());
404 ID.AddInteger(GA->getAddressSpace());
407 case ISD::BasicBlock:
408 ID.AddPointer(cast<BasicBlockSDNode>(N)->getBasicBlock());
411 ID.AddInteger(cast<RegisterSDNode>(N)->getReg());
413 case ISD::RegisterMask:
414 ID.AddPointer(cast<RegisterMaskSDNode>(N)->getRegMask());
417 ID.AddPointer(cast<SrcValueSDNode>(N)->getValue());
419 case ISD::FrameIndex:
420 case ISD::TargetFrameIndex:
421 ID.AddInteger(cast<FrameIndexSDNode>(N)->getIndex());
424 case ISD::TargetJumpTable:
425 ID.AddInteger(cast<JumpTableSDNode>(N)->getIndex());
426 ID.AddInteger(cast<JumpTableSDNode>(N)->getTargetFlags());
428 case ISD::ConstantPool:
429 case ISD::TargetConstantPool: {
430 const ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(N);
431 ID.AddInteger(CP->getAlignment());
432 ID.AddInteger(CP->getOffset());
433 if (CP->isMachineConstantPoolEntry())
434 CP->getMachineCPVal()->addSelectionDAGCSEId(ID);
436 ID.AddPointer(CP->getConstVal());
437 ID.AddInteger(CP->getTargetFlags());
440 case ISD::TargetIndex: {
441 const TargetIndexSDNode *TI = cast<TargetIndexSDNode>(N);
442 ID.AddInteger(TI->getIndex());
443 ID.AddInteger(TI->getOffset());
444 ID.AddInteger(TI->getTargetFlags());
448 const LoadSDNode *LD = cast<LoadSDNode>(N);
449 ID.AddInteger(LD->getMemoryVT().getRawBits());
450 ID.AddInteger(LD->getRawSubclassData());
451 ID.AddInteger(LD->getPointerInfo().getAddrSpace());
455 const StoreSDNode *ST = cast<StoreSDNode>(N);
456 ID.AddInteger(ST->getMemoryVT().getRawBits());
457 ID.AddInteger(ST->getRawSubclassData());
458 ID.AddInteger(ST->getPointerInfo().getAddrSpace());
461 case ISD::ATOMIC_CMP_SWAP:
462 case ISD::ATOMIC_SWAP:
463 case ISD::ATOMIC_LOAD_ADD:
464 case ISD::ATOMIC_LOAD_SUB:
465 case ISD::ATOMIC_LOAD_AND:
466 case ISD::ATOMIC_LOAD_OR:
467 case ISD::ATOMIC_LOAD_XOR:
468 case ISD::ATOMIC_LOAD_NAND:
469 case ISD::ATOMIC_LOAD_MIN:
470 case ISD::ATOMIC_LOAD_MAX:
471 case ISD::ATOMIC_LOAD_UMIN:
472 case ISD::ATOMIC_LOAD_UMAX:
473 case ISD::ATOMIC_LOAD:
474 case ISD::ATOMIC_STORE: {
475 const AtomicSDNode *AT = cast<AtomicSDNode>(N);
476 ID.AddInteger(AT->getMemoryVT().getRawBits());
477 ID.AddInteger(AT->getRawSubclassData());
478 ID.AddInteger(AT->getPointerInfo().getAddrSpace());
481 case ISD::PREFETCH: {
482 const MemSDNode *PF = cast<MemSDNode>(N);
483 ID.AddInteger(PF->getPointerInfo().getAddrSpace());
486 case ISD::VECTOR_SHUFFLE: {
487 const ShuffleVectorSDNode *SVN = cast<ShuffleVectorSDNode>(N);
488 for (unsigned i = 0, e = N->getValueType(0).getVectorNumElements();
490 ID.AddInteger(SVN->getMaskElt(i));
493 case ISD::TargetBlockAddress:
494 case ISD::BlockAddress: {
495 const BlockAddressSDNode *BA = cast<BlockAddressSDNode>(N);
496 ID.AddPointer(BA->getBlockAddress());
497 ID.AddInteger(BA->getOffset());
498 ID.AddInteger(BA->getTargetFlags());
501 } // end switch (N->getOpcode())
503 // Target specific memory nodes could also have address spaces to check.
504 if (N->isTargetMemoryOpcode())
505 ID.AddInteger(cast<MemSDNode>(N)->getPointerInfo().getAddrSpace());
508 /// AddNodeIDNode - Generic routine for adding a nodes info to the NodeID
510 static void AddNodeIDNode(FoldingSetNodeID &ID, const SDNode *N) {
511 AddNodeIDOpcode(ID, N->getOpcode());
512 // Add the return value info.
513 AddNodeIDValueTypes(ID, N->getVTList());
514 // Add the operand info.
515 AddNodeIDOperands(ID, N->op_begin(), N->getNumOperands());
517 // Handle SDNode leafs with special info.
518 AddNodeIDCustom(ID, N);
521 /// encodeMemSDNodeFlags - Generic routine for computing a value for use in
522 /// the CSE map that carries volatility, temporalness, indexing mode, and
523 /// extension/truncation information.
525 static inline unsigned
526 encodeMemSDNodeFlags(int ConvType, ISD::MemIndexedMode AM, bool isVolatile,
527 bool isNonTemporal, bool isInvariant) {
528 assert((ConvType & 3) == ConvType &&
529 "ConvType may not require more than 2 bits!");
530 assert((AM & 7) == AM &&
531 "AM may not require more than 3 bits!");
535 (isNonTemporal << 6) |
539 //===----------------------------------------------------------------------===//
540 // SelectionDAG Class
541 //===----------------------------------------------------------------------===//
543 /// doNotCSE - Return true if CSE should not be performed for this node.
544 static bool doNotCSE(SDNode *N) {
545 if (N->getValueType(0) == MVT::Glue)
546 return true; // Never CSE anything that produces a flag.
548 switch (N->getOpcode()) {
550 case ISD::HANDLENODE:
552 return true; // Never CSE these nodes.
555 // Check that remaining values produced are not flags.
556 for (unsigned i = 1, e = N->getNumValues(); i != e; ++i)
557 if (N->getValueType(i) == MVT::Glue)
558 return true; // Never CSE anything that produces a flag.
563 /// RemoveDeadNodes - This method deletes all unreachable nodes in the
565 void SelectionDAG::RemoveDeadNodes() {
566 // Create a dummy node (which is not added to allnodes), that adds a reference
567 // to the root node, preventing it from being deleted.
568 HandleSDNode Dummy(getRoot());
570 SmallVector<SDNode*, 128> DeadNodes;
572 // Add all obviously-dead nodes to the DeadNodes worklist.
573 for (allnodes_iterator I = allnodes_begin(), E = allnodes_end(); I != E; ++I)
575 DeadNodes.push_back(I);
577 RemoveDeadNodes(DeadNodes);
579 // If the root changed (e.g. it was a dead load, update the root).
580 setRoot(Dummy.getValue());
583 /// RemoveDeadNodes - This method deletes the unreachable nodes in the
584 /// given list, and any nodes that become unreachable as a result.
585 void SelectionDAG::RemoveDeadNodes(SmallVectorImpl<SDNode *> &DeadNodes) {
587 // Process the worklist, deleting the nodes and adding their uses to the
589 while (!DeadNodes.empty()) {
590 SDNode *N = DeadNodes.pop_back_val();
592 for (DAGUpdateListener *DUL = UpdateListeners; DUL; DUL = DUL->Next)
593 DUL->NodeDeleted(N, 0);
595 // Take the node out of the appropriate CSE map.
596 RemoveNodeFromCSEMaps(N);
598 // Next, brutally remove the operand list. This is safe to do, as there are
599 // no cycles in the graph.
600 for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ) {
602 SDNode *Operand = Use.getNode();
605 // Now that we removed this operand, see if there are no uses of it left.
606 if (Operand->use_empty())
607 DeadNodes.push_back(Operand);
614 void SelectionDAG::RemoveDeadNode(SDNode *N){
615 SmallVector<SDNode*, 16> DeadNodes(1, N);
617 // Create a dummy node that adds a reference to the root node, preventing
618 // it from being deleted. (This matters if the root is an operand of the
620 HandleSDNode Dummy(getRoot());
622 RemoveDeadNodes(DeadNodes);
625 void SelectionDAG::DeleteNode(SDNode *N) {
626 // First take this out of the appropriate CSE map.
627 RemoveNodeFromCSEMaps(N);
629 // Finally, remove uses due to operands of this node, remove from the
630 // AllNodes list, and delete the node.
631 DeleteNodeNotInCSEMaps(N);
634 void SelectionDAG::DeleteNodeNotInCSEMaps(SDNode *N) {
635 assert(N != AllNodes.begin() && "Cannot delete the entry node!");
636 assert(N->use_empty() && "Cannot delete a node that is not dead!");
638 // Drop all of the operands and decrement used node's use counts.
644 void SelectionDAG::DeallocateNode(SDNode *N) {
645 if (N->OperandsNeedDelete)
646 delete[] N->OperandList;
648 // Set the opcode to DELETED_NODE to help catch bugs when node
649 // memory is reallocated.
650 N->NodeType = ISD::DELETED_NODE;
652 NodeAllocator.Deallocate(AllNodes.remove(N));
654 // Remove the ordering of this node.
657 // If any of the SDDbgValue nodes refer to this SDNode, invalidate them.
658 ArrayRef<SDDbgValue*> DbgVals = DbgInfo->getSDDbgValues(N);
659 for (unsigned i = 0, e = DbgVals.size(); i != e; ++i)
660 DbgVals[i]->setIsInvalidated();
663 /// RemoveNodeFromCSEMaps - Take the specified node out of the CSE map that
664 /// correspond to it. This is useful when we're about to delete or repurpose
665 /// the node. We don't want future request for structurally identical nodes
666 /// to return N anymore.
667 bool SelectionDAG::RemoveNodeFromCSEMaps(SDNode *N) {
669 switch (N->getOpcode()) {
670 case ISD::HANDLENODE: return false; // noop.
672 assert(CondCodeNodes[cast<CondCodeSDNode>(N)->get()] &&
673 "Cond code doesn't exist!");
674 Erased = CondCodeNodes[cast<CondCodeSDNode>(N)->get()] != 0;
675 CondCodeNodes[cast<CondCodeSDNode>(N)->get()] = 0;
677 case ISD::ExternalSymbol:
678 Erased = ExternalSymbols.erase(cast<ExternalSymbolSDNode>(N)->getSymbol());
680 case ISD::TargetExternalSymbol: {
681 ExternalSymbolSDNode *ESN = cast<ExternalSymbolSDNode>(N);
682 Erased = TargetExternalSymbols.erase(
683 std::pair<std::string,unsigned char>(ESN->getSymbol(),
684 ESN->getTargetFlags()));
687 case ISD::VALUETYPE: {
688 EVT VT = cast<VTSDNode>(N)->getVT();
689 if (VT.isExtended()) {
690 Erased = ExtendedValueTypeNodes.erase(VT);
692 Erased = ValueTypeNodes[VT.getSimpleVT().SimpleTy] != 0;
693 ValueTypeNodes[VT.getSimpleVT().SimpleTy] = 0;
698 // Remove it from the CSE Map.
699 assert(N->getOpcode() != ISD::DELETED_NODE && "DELETED_NODE in CSEMap!");
700 assert(N->getOpcode() != ISD::EntryToken && "EntryToken in CSEMap!");
701 Erased = CSEMap.RemoveNode(N);
705 // Verify that the node was actually in one of the CSE maps, unless it has a
706 // flag result (which cannot be CSE'd) or is one of the special cases that are
707 // not subject to CSE.
708 if (!Erased && N->getValueType(N->getNumValues()-1) != MVT::Glue &&
709 !N->isMachineOpcode() && !doNotCSE(N)) {
712 llvm_unreachable("Node is not in map!");
718 /// AddModifiedNodeToCSEMaps - The specified node has been removed from the CSE
719 /// maps and modified in place. Add it back to the CSE maps, unless an identical
720 /// node already exists, in which case transfer all its users to the existing
721 /// node. This transfer can potentially trigger recursive merging.
724 SelectionDAG::AddModifiedNodeToCSEMaps(SDNode *N) {
725 // For node types that aren't CSE'd, just act as if no identical node
728 SDNode *Existing = CSEMap.GetOrInsertNode(N);
730 // If there was already an existing matching node, use ReplaceAllUsesWith
731 // to replace the dead one with the existing one. This can cause
732 // recursive merging of other unrelated nodes down the line.
733 ReplaceAllUsesWith(N, Existing);
735 // N is now dead. Inform the listeners and delete it.
736 for (DAGUpdateListener *DUL = UpdateListeners; DUL; DUL = DUL->Next)
737 DUL->NodeDeleted(N, Existing);
738 DeleteNodeNotInCSEMaps(N);
743 // If the node doesn't already exist, we updated it. Inform listeners.
744 for (DAGUpdateListener *DUL = UpdateListeners; DUL; DUL = DUL->Next)
748 /// FindModifiedNodeSlot - Find a slot for the specified node if its operands
749 /// were replaced with those specified. If this node is never memoized,
750 /// return null, otherwise return a pointer to the slot it would take. If a
751 /// node already exists with these operands, the slot will be non-null.
752 SDNode *SelectionDAG::FindModifiedNodeSlot(SDNode *N, SDValue Op,
757 SDValue Ops[] = { Op };
759 AddNodeIDNode(ID, N->getOpcode(), N->getVTList(), Ops, 1);
760 AddNodeIDCustom(ID, N);
761 SDNode *Node = CSEMap.FindNodeOrInsertPos(ID, InsertPos);
765 /// FindModifiedNodeSlot - Find a slot for the specified node if its operands
766 /// were replaced with those specified. If this node is never memoized,
767 /// return null, otherwise return a pointer to the slot it would take. If a
768 /// node already exists with these operands, the slot will be non-null.
769 SDNode *SelectionDAG::FindModifiedNodeSlot(SDNode *N,
770 SDValue Op1, SDValue Op2,
775 SDValue Ops[] = { Op1, Op2 };
777 AddNodeIDNode(ID, N->getOpcode(), N->getVTList(), Ops, 2);
778 AddNodeIDCustom(ID, N);
779 SDNode *Node = CSEMap.FindNodeOrInsertPos(ID, InsertPos);
784 /// FindModifiedNodeSlot - Find a slot for the specified node if its operands
785 /// were replaced with those specified. If this node is never memoized,
786 /// return null, otherwise return a pointer to the slot it would take. If a
787 /// node already exists with these operands, the slot will be non-null.
788 SDNode *SelectionDAG::FindModifiedNodeSlot(SDNode *N,
789 const SDValue *Ops,unsigned NumOps,
795 AddNodeIDNode(ID, N->getOpcode(), N->getVTList(), Ops, NumOps);
796 AddNodeIDCustom(ID, N);
797 SDNode *Node = CSEMap.FindNodeOrInsertPos(ID, InsertPos);
802 /// VerifyNodeCommon - Sanity check the given node. Aborts if it is invalid.
803 static void VerifyNodeCommon(SDNode *N) {
804 switch (N->getOpcode()) {
807 case ISD::BUILD_PAIR: {
808 EVT VT = N->getValueType(0);
809 assert(N->getNumValues() == 1 && "Too many results!");
810 assert(!VT.isVector() && (VT.isInteger() || VT.isFloatingPoint()) &&
811 "Wrong return type!");
812 assert(N->getNumOperands() == 2 && "Wrong number of operands!");
813 assert(N->getOperand(0).getValueType() == N->getOperand(1).getValueType() &&
814 "Mismatched operand types!");
815 assert(N->getOperand(0).getValueType().isInteger() == VT.isInteger() &&
816 "Wrong operand type!");
817 assert(VT.getSizeInBits() == 2 * N->getOperand(0).getValueSizeInBits() &&
818 "Wrong return type size");
821 case ISD::BUILD_VECTOR: {
822 assert(N->getNumValues() == 1 && "Too many results!");
823 assert(N->getValueType(0).isVector() && "Wrong return type!");
824 assert(N->getNumOperands() == N->getValueType(0).getVectorNumElements() &&
825 "Wrong number of operands!");
826 EVT EltVT = N->getValueType(0).getVectorElementType();
827 for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ++I) {
828 assert((I->getValueType() == EltVT ||
829 (EltVT.isInteger() && I->getValueType().isInteger() &&
830 EltVT.bitsLE(I->getValueType()))) &&
831 "Wrong operand type!");
832 assert(I->getValueType() == N->getOperand(0).getValueType() &&
833 "Operands must all have the same type");
840 /// VerifySDNode - Sanity check the given SDNode. Aborts if it is invalid.
841 static void VerifySDNode(SDNode *N) {
842 // The SDNode allocators cannot be used to allocate nodes with fields that are
843 // not present in an SDNode!
844 assert(!isa<MemSDNode>(N) && "Bad MemSDNode!");
845 assert(!isa<ShuffleVectorSDNode>(N) && "Bad ShuffleVectorSDNode!");
846 assert(!isa<ConstantSDNode>(N) && "Bad ConstantSDNode!");
847 assert(!isa<ConstantFPSDNode>(N) && "Bad ConstantFPSDNode!");
848 assert(!isa<GlobalAddressSDNode>(N) && "Bad GlobalAddressSDNode!");
849 assert(!isa<FrameIndexSDNode>(N) && "Bad FrameIndexSDNode!");
850 assert(!isa<JumpTableSDNode>(N) && "Bad JumpTableSDNode!");
851 assert(!isa<ConstantPoolSDNode>(N) && "Bad ConstantPoolSDNode!");
852 assert(!isa<BasicBlockSDNode>(N) && "Bad BasicBlockSDNode!");
853 assert(!isa<SrcValueSDNode>(N) && "Bad SrcValueSDNode!");
854 assert(!isa<MDNodeSDNode>(N) && "Bad MDNodeSDNode!");
855 assert(!isa<RegisterSDNode>(N) && "Bad RegisterSDNode!");
856 assert(!isa<BlockAddressSDNode>(N) && "Bad BlockAddressSDNode!");
857 assert(!isa<EHLabelSDNode>(N) && "Bad EHLabelSDNode!");
858 assert(!isa<ExternalSymbolSDNode>(N) && "Bad ExternalSymbolSDNode!");
859 assert(!isa<CondCodeSDNode>(N) && "Bad CondCodeSDNode!");
860 assert(!isa<CvtRndSatSDNode>(N) && "Bad CvtRndSatSDNode!");
861 assert(!isa<VTSDNode>(N) && "Bad VTSDNode!");
862 assert(!isa<MachineSDNode>(N) && "Bad MachineSDNode!");
867 /// VerifyMachineNode - Sanity check the given MachineNode. Aborts if it is
869 static void VerifyMachineNode(SDNode *N) {
870 // The MachineNode allocators cannot be used to allocate nodes with fields
871 // that are not present in a MachineNode!
872 // Currently there are no such nodes.
878 /// getEVTAlignment - Compute the default alignment value for the
881 unsigned SelectionDAG::getEVTAlignment(EVT VT) const {
882 Type *Ty = VT == MVT::iPTR ?
883 PointerType::get(Type::getInt8Ty(*getContext()), 0) :
884 VT.getTypeForEVT(*getContext());
886 return TLI.getDataLayout()->getABITypeAlignment(Ty);
889 // EntryNode could meaningfully have debug info if we can find it...
890 SelectionDAG::SelectionDAG(const TargetMachine &tm, CodeGenOpt::Level OL)
891 : TM(tm), TLI(*tm.getTargetLowering()), TSI(*tm.getSelectionDAGInfo()),
892 OptLevel(OL), EntryNode(ISD::EntryToken, DebugLoc(), getVTList(MVT::Other)),
893 Root(getEntryNode()), Ordering(0), UpdateListeners(0) {
894 AllNodes.push_back(&EntryNode);
895 Ordering = new SDNodeOrdering();
896 DbgInfo = new SDDbgInfo();
899 void SelectionDAG::init(MachineFunction &mf) {
901 Context = &mf.getFunction()->getContext();
904 SelectionDAG::~SelectionDAG() {
905 assert(!UpdateListeners && "Dangling registered DAGUpdateListeners");
911 void SelectionDAG::allnodes_clear() {
912 assert(&*AllNodes.begin() == &EntryNode);
913 AllNodes.remove(AllNodes.begin());
914 while (!AllNodes.empty())
915 DeallocateNode(AllNodes.begin());
918 void SelectionDAG::clear() {
920 OperandAllocator.Reset();
923 ExtendedValueTypeNodes.clear();
924 ExternalSymbols.clear();
925 TargetExternalSymbols.clear();
926 std::fill(CondCodeNodes.begin(), CondCodeNodes.end(),
927 static_cast<CondCodeSDNode*>(0));
928 std::fill(ValueTypeNodes.begin(), ValueTypeNodes.end(),
929 static_cast<SDNode*>(0));
931 EntryNode.UseList = 0;
932 AllNodes.push_back(&EntryNode);
933 Root = getEntryNode();
938 SDValue SelectionDAG::getAnyExtOrTrunc(SDValue Op, DebugLoc DL, EVT VT) {
939 return VT.bitsGT(Op.getValueType()) ?
940 getNode(ISD::ANY_EXTEND, DL, VT, Op) :
941 getNode(ISD::TRUNCATE, DL, VT, Op);
944 SDValue SelectionDAG::getSExtOrTrunc(SDValue Op, DebugLoc DL, EVT VT) {
945 return VT.bitsGT(Op.getValueType()) ?
946 getNode(ISD::SIGN_EXTEND, DL, VT, Op) :
947 getNode(ISD::TRUNCATE, DL, VT, Op);
950 SDValue SelectionDAG::getZExtOrTrunc(SDValue Op, DebugLoc DL, EVT VT) {
951 return VT.bitsGT(Op.getValueType()) ?
952 getNode(ISD::ZERO_EXTEND, DL, VT, Op) :
953 getNode(ISD::TRUNCATE, DL, VT, Op);
956 SDValue SelectionDAG::getZeroExtendInReg(SDValue Op, DebugLoc DL, EVT VT) {
957 assert(!VT.isVector() &&
958 "getZeroExtendInReg should use the vector element type instead of "
960 if (Op.getValueType() == VT) return Op;
961 unsigned BitWidth = Op.getValueType().getScalarType().getSizeInBits();
962 APInt Imm = APInt::getLowBitsSet(BitWidth,
964 return getNode(ISD::AND, DL, Op.getValueType(), Op,
965 getConstant(Imm, Op.getValueType()));
968 /// getNOT - Create a bitwise NOT operation as (XOR Val, -1).
970 SDValue SelectionDAG::getNOT(DebugLoc DL, SDValue Val, EVT VT) {
971 EVT EltVT = VT.getScalarType();
973 getConstant(APInt::getAllOnesValue(EltVT.getSizeInBits()), VT);
974 return getNode(ISD::XOR, DL, VT, Val, NegOne);
977 SDValue SelectionDAG::getConstant(uint64_t Val, EVT VT, bool isT) {
978 EVT EltVT = VT.getScalarType();
979 assert((EltVT.getSizeInBits() >= 64 ||
980 (uint64_t)((int64_t)Val >> EltVT.getSizeInBits()) + 1 < 2) &&
981 "getConstant with a uint64_t value that doesn't fit in the type!");
982 return getConstant(APInt(EltVT.getSizeInBits(), Val), VT, isT);
985 SDValue SelectionDAG::getConstant(const APInt &Val, EVT VT, bool isT) {
986 return getConstant(*ConstantInt::get(*Context, Val), VT, isT);
989 SDValue SelectionDAG::getConstant(const ConstantInt &Val, EVT VT, bool isT) {
990 assert(VT.isInteger() && "Cannot create FP integer constant!");
992 EVT EltVT = VT.getScalarType();
993 const ConstantInt *Elt = &Val;
995 // In some cases the vector type is legal but the element type is illegal and
996 // needs to be promoted, for example v8i8 on ARM. In this case, promote the
997 // inserted value (the type does not need to match the vector element type).
998 // Any extra bits introduced will be truncated away.
999 if (VT.isVector() && TLI.getTypeAction(*getContext(), EltVT) ==
1000 TargetLowering::TypePromoteInteger) {
1001 EltVT = TLI.getTypeToTransformTo(*getContext(), EltVT);
1002 APInt NewVal = Elt->getValue().zext(EltVT.getSizeInBits());
1003 Elt = ConstantInt::get(*getContext(), NewVal);
1006 assert(Elt->getBitWidth() == EltVT.getSizeInBits() &&
1007 "APInt size does not match type size!");
1008 unsigned Opc = isT ? ISD::TargetConstant : ISD::Constant;
1009 FoldingSetNodeID ID;
1010 AddNodeIDNode(ID, Opc, getVTList(EltVT), 0, 0);
1014 if ((N = CSEMap.FindNodeOrInsertPos(ID, IP)))
1016 return SDValue(N, 0);
1019 N = new (NodeAllocator) ConstantSDNode(isT, Elt, EltVT);
1020 CSEMap.InsertNode(N, IP);
1021 AllNodes.push_back(N);
1024 SDValue Result(N, 0);
1025 if (VT.isVector()) {
1026 SmallVector<SDValue, 8> Ops;
1027 Ops.assign(VT.getVectorNumElements(), Result);
1028 Result = getNode(ISD::BUILD_VECTOR, DebugLoc(), VT, &Ops[0], Ops.size());
1033 SDValue SelectionDAG::getIntPtrConstant(uint64_t Val, bool isTarget) {
1034 return getConstant(Val, TLI.getPointerTy(), isTarget);
1038 SDValue SelectionDAG::getConstantFP(const APFloat& V, EVT VT, bool isTarget) {
1039 return getConstantFP(*ConstantFP::get(*getContext(), V), VT, isTarget);
1042 SDValue SelectionDAG::getConstantFP(const ConstantFP& V, EVT VT, bool isTarget){
1043 assert(VT.isFloatingPoint() && "Cannot create integer FP constant!");
1045 EVT EltVT = VT.getScalarType();
1047 // Do the map lookup using the actual bit pattern for the floating point
1048 // value, so that we don't have problems with 0.0 comparing equal to -0.0, and
1049 // we don't have issues with SNANs.
1050 unsigned Opc = isTarget ? ISD::TargetConstantFP : ISD::ConstantFP;
1051 FoldingSetNodeID ID;
1052 AddNodeIDNode(ID, Opc, getVTList(EltVT), 0, 0);
1056 if ((N = CSEMap.FindNodeOrInsertPos(ID, IP)))
1058 return SDValue(N, 0);
1061 N = new (NodeAllocator) ConstantFPSDNode(isTarget, &V, EltVT);
1062 CSEMap.InsertNode(N, IP);
1063 AllNodes.push_back(N);
1066 SDValue Result(N, 0);
1067 if (VT.isVector()) {
1068 SmallVector<SDValue, 8> Ops;
1069 Ops.assign(VT.getVectorNumElements(), Result);
1070 // FIXME DebugLoc info might be appropriate here
1071 Result = getNode(ISD::BUILD_VECTOR, DebugLoc(), VT, &Ops[0], Ops.size());
1076 SDValue SelectionDAG::getConstantFP(double Val, EVT VT, bool isTarget) {
1077 EVT EltVT = VT.getScalarType();
1078 if (EltVT==MVT::f32)
1079 return getConstantFP(APFloat((float)Val), VT, isTarget);
1080 else if (EltVT==MVT::f64)
1081 return getConstantFP(APFloat(Val), VT, isTarget);
1082 else if (EltVT==MVT::f80 || EltVT==MVT::f128 || EltVT==MVT::f16) {
1084 APFloat apf = APFloat(Val);
1085 apf.convert(*EVTToAPFloatSemantics(EltVT), APFloat::rmNearestTiesToEven,
1087 return getConstantFP(apf, VT, isTarget);
1089 llvm_unreachable("Unsupported type in getConstantFP");
1092 SDValue SelectionDAG::getGlobalAddress(const GlobalValue *GV, DebugLoc DL,
1093 EVT VT, int64_t Offset,
1095 unsigned char TargetFlags) {
1096 assert((TargetFlags == 0 || isTargetGA) &&
1097 "Cannot set target flags on target-independent globals");
1099 // Truncate (with sign-extension) the offset value to the pointer size.
1100 unsigned BitWidth = TLI.getPointerTy().getSizeInBits();
1102 Offset = SignExtend64(Offset, BitWidth);
1104 const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV);
1106 // If GV is an alias then use the aliasee for determining thread-localness.
1107 if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV))
1108 GVar = dyn_cast_or_null<GlobalVariable>(GA->resolveAliasedGlobal(false));
1112 if (GVar && GVar->isThreadLocal())
1113 Opc = isTargetGA ? ISD::TargetGlobalTLSAddress : ISD::GlobalTLSAddress;
1115 Opc = isTargetGA ? ISD::TargetGlobalAddress : ISD::GlobalAddress;
1117 FoldingSetNodeID ID;
1118 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0);
1120 ID.AddInteger(Offset);
1121 ID.AddInteger(TargetFlags);
1122 ID.AddInteger(GV->getType()->getAddressSpace());
1124 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1125 return SDValue(E, 0);
1127 SDNode *N = new (NodeAllocator) GlobalAddressSDNode(Opc, DL, GV, VT,
1128 Offset, TargetFlags);
1129 CSEMap.InsertNode(N, IP);
1130 AllNodes.push_back(N);
1131 return SDValue(N, 0);
1134 SDValue SelectionDAG::getFrameIndex(int FI, EVT VT, bool isTarget) {
1135 unsigned Opc = isTarget ? ISD::TargetFrameIndex : ISD::FrameIndex;
1136 FoldingSetNodeID ID;
1137 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0);
1140 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1141 return SDValue(E, 0);
1143 SDNode *N = new (NodeAllocator) FrameIndexSDNode(FI, VT, isTarget);
1144 CSEMap.InsertNode(N, IP);
1145 AllNodes.push_back(N);
1146 return SDValue(N, 0);
1149 SDValue SelectionDAG::getJumpTable(int JTI, EVT VT, bool isTarget,
1150 unsigned char TargetFlags) {
1151 assert((TargetFlags == 0 || isTarget) &&
1152 "Cannot set target flags on target-independent jump tables");
1153 unsigned Opc = isTarget ? ISD::TargetJumpTable : ISD::JumpTable;
1154 FoldingSetNodeID ID;
1155 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0);
1157 ID.AddInteger(TargetFlags);
1159 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1160 return SDValue(E, 0);
1162 SDNode *N = new (NodeAllocator) JumpTableSDNode(JTI, VT, isTarget,
1164 CSEMap.InsertNode(N, IP);
1165 AllNodes.push_back(N);
1166 return SDValue(N, 0);
1169 SDValue SelectionDAG::getConstantPool(const Constant *C, EVT VT,
1170 unsigned Alignment, int Offset,
1172 unsigned char TargetFlags) {
1173 assert((TargetFlags == 0 || isTarget) &&
1174 "Cannot set target flags on target-independent globals");
1176 Alignment = TLI.getDataLayout()->getPrefTypeAlignment(C->getType());
1177 unsigned Opc = isTarget ? ISD::TargetConstantPool : ISD::ConstantPool;
1178 FoldingSetNodeID ID;
1179 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0);
1180 ID.AddInteger(Alignment);
1181 ID.AddInteger(Offset);
1183 ID.AddInteger(TargetFlags);
1185 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1186 return SDValue(E, 0);
1188 SDNode *N = new (NodeAllocator) ConstantPoolSDNode(isTarget, C, VT, Offset,
1189 Alignment, TargetFlags);
1190 CSEMap.InsertNode(N, IP);
1191 AllNodes.push_back(N);
1192 return SDValue(N, 0);
1196 SDValue SelectionDAG::getConstantPool(MachineConstantPoolValue *C, EVT VT,
1197 unsigned Alignment, int Offset,
1199 unsigned char TargetFlags) {
1200 assert((TargetFlags == 0 || isTarget) &&
1201 "Cannot set target flags on target-independent globals");
1203 Alignment = TLI.getDataLayout()->getPrefTypeAlignment(C->getType());
1204 unsigned Opc = isTarget ? ISD::TargetConstantPool : ISD::ConstantPool;
1205 FoldingSetNodeID ID;
1206 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0);
1207 ID.AddInteger(Alignment);
1208 ID.AddInteger(Offset);
1209 C->addSelectionDAGCSEId(ID);
1210 ID.AddInteger(TargetFlags);
1212 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1213 return SDValue(E, 0);
1215 SDNode *N = new (NodeAllocator) ConstantPoolSDNode(isTarget, C, VT, Offset,
1216 Alignment, TargetFlags);
1217 CSEMap.InsertNode(N, IP);
1218 AllNodes.push_back(N);
1219 return SDValue(N, 0);
1222 SDValue SelectionDAG::getTargetIndex(int Index, EVT VT, int64_t Offset,
1223 unsigned char TargetFlags) {
1224 FoldingSetNodeID ID;
1225 AddNodeIDNode(ID, ISD::TargetIndex, getVTList(VT), 0, 0);
1226 ID.AddInteger(Index);
1227 ID.AddInteger(Offset);
1228 ID.AddInteger(TargetFlags);
1230 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1231 return SDValue(E, 0);
1233 SDNode *N = new (NodeAllocator) TargetIndexSDNode(Index, VT, Offset,
1235 CSEMap.InsertNode(N, IP);
1236 AllNodes.push_back(N);
1237 return SDValue(N, 0);
1240 SDValue SelectionDAG::getBasicBlock(MachineBasicBlock *MBB) {
1241 FoldingSetNodeID ID;
1242 AddNodeIDNode(ID, ISD::BasicBlock, getVTList(MVT::Other), 0, 0);
1245 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1246 return SDValue(E, 0);
1248 SDNode *N = new (NodeAllocator) BasicBlockSDNode(MBB);
1249 CSEMap.InsertNode(N, IP);
1250 AllNodes.push_back(N);
1251 return SDValue(N, 0);
1254 SDValue SelectionDAG::getValueType(EVT VT) {
1255 if (VT.isSimple() && (unsigned)VT.getSimpleVT().SimpleTy >=
1256 ValueTypeNodes.size())
1257 ValueTypeNodes.resize(VT.getSimpleVT().SimpleTy+1);
1259 SDNode *&N = VT.isExtended() ?
1260 ExtendedValueTypeNodes[VT] : ValueTypeNodes[VT.getSimpleVT().SimpleTy];
1262 if (N) return SDValue(N, 0);
1263 N = new (NodeAllocator) VTSDNode(VT);
1264 AllNodes.push_back(N);
1265 return SDValue(N, 0);
1268 SDValue SelectionDAG::getExternalSymbol(const char *Sym, EVT VT) {
1269 SDNode *&N = ExternalSymbols[Sym];
1270 if (N) return SDValue(N, 0);
1271 N = new (NodeAllocator) ExternalSymbolSDNode(false, Sym, 0, VT);
1272 AllNodes.push_back(N);
1273 return SDValue(N, 0);
1276 SDValue SelectionDAG::getTargetExternalSymbol(const char *Sym, EVT VT,
1277 unsigned char TargetFlags) {
1279 TargetExternalSymbols[std::pair<std::string,unsigned char>(Sym,
1281 if (N) return SDValue(N, 0);
1282 N = new (NodeAllocator) ExternalSymbolSDNode(true, Sym, TargetFlags, VT);
1283 AllNodes.push_back(N);
1284 return SDValue(N, 0);
1287 SDValue SelectionDAG::getCondCode(ISD::CondCode Cond) {
1288 if ((unsigned)Cond >= CondCodeNodes.size())
1289 CondCodeNodes.resize(Cond+1);
1291 if (CondCodeNodes[Cond] == 0) {
1292 CondCodeSDNode *N = new (NodeAllocator) CondCodeSDNode(Cond);
1293 CondCodeNodes[Cond] = N;
1294 AllNodes.push_back(N);
1297 return SDValue(CondCodeNodes[Cond], 0);
1300 // commuteShuffle - swaps the values of N1 and N2, and swaps all indices in
1301 // the shuffle mask M that point at N1 to point at N2, and indices that point
1302 // N2 to point at N1.
1303 static void commuteShuffle(SDValue &N1, SDValue &N2, SmallVectorImpl<int> &M) {
1305 int NElts = M.size();
1306 for (int i = 0; i != NElts; ++i) {
1314 SDValue SelectionDAG::getVectorShuffle(EVT VT, DebugLoc dl, SDValue N1,
1315 SDValue N2, const int *Mask) {
1316 assert(N1.getValueType() == N2.getValueType() && "Invalid VECTOR_SHUFFLE");
1317 assert(VT.isVector() && N1.getValueType().isVector() &&
1318 "Vector Shuffle VTs must be a vectors");
1319 assert(VT.getVectorElementType() == N1.getValueType().getVectorElementType()
1320 && "Vector Shuffle VTs must have same element type");
1322 // Canonicalize shuffle undef, undef -> undef
1323 if (N1.getOpcode() == ISD::UNDEF && N2.getOpcode() == ISD::UNDEF)
1324 return getUNDEF(VT);
1326 // Validate that all indices in Mask are within the range of the elements
1327 // input to the shuffle.
1328 unsigned NElts = VT.getVectorNumElements();
1329 SmallVector<int, 8> MaskVec;
1330 for (unsigned i = 0; i != NElts; ++i) {
1331 assert(Mask[i] < (int)(NElts * 2) && "Index out of range");
1332 MaskVec.push_back(Mask[i]);
1335 // Canonicalize shuffle v, v -> v, undef
1338 for (unsigned i = 0; i != NElts; ++i)
1339 if (MaskVec[i] >= (int)NElts) MaskVec[i] -= NElts;
1342 // Canonicalize shuffle undef, v -> v, undef. Commute the shuffle mask.
1343 if (N1.getOpcode() == ISD::UNDEF)
1344 commuteShuffle(N1, N2, MaskVec);
1346 // Canonicalize all index into lhs, -> shuffle lhs, undef
1347 // Canonicalize all index into rhs, -> shuffle rhs, undef
1348 bool AllLHS = true, AllRHS = true;
1349 bool N2Undef = N2.getOpcode() == ISD::UNDEF;
1350 for (unsigned i = 0; i != NElts; ++i) {
1351 if (MaskVec[i] >= (int)NElts) {
1356 } else if (MaskVec[i] >= 0) {
1360 if (AllLHS && AllRHS)
1361 return getUNDEF(VT);
1362 if (AllLHS && !N2Undef)
1366 commuteShuffle(N1, N2, MaskVec);
1369 // If Identity shuffle, or all shuffle in to undef, return that node.
1370 bool AllUndef = true;
1371 bool Identity = true;
1372 for (unsigned i = 0; i != NElts; ++i) {
1373 if (MaskVec[i] >= 0 && MaskVec[i] != (int)i) Identity = false;
1374 if (MaskVec[i] >= 0) AllUndef = false;
1376 if (Identity && NElts == N1.getValueType().getVectorNumElements())
1379 return getUNDEF(VT);
1381 FoldingSetNodeID ID;
1382 SDValue Ops[2] = { N1, N2 };
1383 AddNodeIDNode(ID, ISD::VECTOR_SHUFFLE, getVTList(VT), Ops, 2);
1384 for (unsigned i = 0; i != NElts; ++i)
1385 ID.AddInteger(MaskVec[i]);
1388 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1389 return SDValue(E, 0);
1391 // Allocate the mask array for the node out of the BumpPtrAllocator, since
1392 // SDNode doesn't have access to it. This memory will be "leaked" when
1393 // the node is deallocated, but recovered when the NodeAllocator is released.
1394 int *MaskAlloc = OperandAllocator.Allocate<int>(NElts);
1395 memcpy(MaskAlloc, &MaskVec[0], NElts * sizeof(int));
1397 ShuffleVectorSDNode *N =
1398 new (NodeAllocator) ShuffleVectorSDNode(VT, dl, N1, N2, MaskAlloc);
1399 CSEMap.InsertNode(N, IP);
1400 AllNodes.push_back(N);
1401 return SDValue(N, 0);
1404 SDValue SelectionDAG::getConvertRndSat(EVT VT, DebugLoc dl,
1405 SDValue Val, SDValue DTy,
1406 SDValue STy, SDValue Rnd, SDValue Sat,
1407 ISD::CvtCode Code) {
1408 // If the src and dest types are the same and the conversion is between
1409 // integer types of the same sign or two floats, no conversion is necessary.
1411 (Code == ISD::CVT_UU || Code == ISD::CVT_SS || Code == ISD::CVT_FF))
1414 FoldingSetNodeID ID;
1415 SDValue Ops[] = { Val, DTy, STy, Rnd, Sat };
1416 AddNodeIDNode(ID, ISD::CONVERT_RNDSAT, getVTList(VT), &Ops[0], 5);
1418 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1419 return SDValue(E, 0);
1421 CvtRndSatSDNode *N = new (NodeAllocator) CvtRndSatSDNode(VT, dl, Ops, 5,
1423 CSEMap.InsertNode(N, IP);
1424 AllNodes.push_back(N);
1425 return SDValue(N, 0);
1428 SDValue SelectionDAG::getRegister(unsigned RegNo, EVT VT) {
1429 FoldingSetNodeID ID;
1430 AddNodeIDNode(ID, ISD::Register, getVTList(VT), 0, 0);
1431 ID.AddInteger(RegNo);
1433 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1434 return SDValue(E, 0);
1436 SDNode *N = new (NodeAllocator) RegisterSDNode(RegNo, VT);
1437 CSEMap.InsertNode(N, IP);
1438 AllNodes.push_back(N);
1439 return SDValue(N, 0);
1442 SDValue SelectionDAG::getRegisterMask(const uint32_t *RegMask) {
1443 FoldingSetNodeID ID;
1444 AddNodeIDNode(ID, ISD::RegisterMask, getVTList(MVT::Untyped), 0, 0);
1445 ID.AddPointer(RegMask);
1447 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1448 return SDValue(E, 0);
1450 SDNode *N = new (NodeAllocator) RegisterMaskSDNode(RegMask);
1451 CSEMap.InsertNode(N, IP);
1452 AllNodes.push_back(N);
1453 return SDValue(N, 0);
1456 SDValue SelectionDAG::getEHLabel(DebugLoc dl, SDValue Root, MCSymbol *Label) {
1457 FoldingSetNodeID ID;
1458 SDValue Ops[] = { Root };
1459 AddNodeIDNode(ID, ISD::EH_LABEL, getVTList(MVT::Other), &Ops[0], 1);
1460 ID.AddPointer(Label);
1462 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1463 return SDValue(E, 0);
1465 SDNode *N = new (NodeAllocator) EHLabelSDNode(dl, Root, Label);
1466 CSEMap.InsertNode(N, IP);
1467 AllNodes.push_back(N);
1468 return SDValue(N, 0);
1472 SDValue SelectionDAG::getBlockAddress(const BlockAddress *BA, EVT VT,
1475 unsigned char TargetFlags) {
1476 unsigned Opc = isTarget ? ISD::TargetBlockAddress : ISD::BlockAddress;
1478 FoldingSetNodeID ID;
1479 AddNodeIDNode(ID, Opc, getVTList(VT), 0, 0);
1481 ID.AddInteger(Offset);
1482 ID.AddInteger(TargetFlags);
1484 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1485 return SDValue(E, 0);
1487 SDNode *N = new (NodeAllocator) BlockAddressSDNode(Opc, VT, BA, Offset,
1489 CSEMap.InsertNode(N, IP);
1490 AllNodes.push_back(N);
1491 return SDValue(N, 0);
1494 SDValue SelectionDAG::getSrcValue(const Value *V) {
1495 assert((!V || V->getType()->isPointerTy()) &&
1496 "SrcValue is not a pointer?");
1498 FoldingSetNodeID ID;
1499 AddNodeIDNode(ID, ISD::SRCVALUE, getVTList(MVT::Other), 0, 0);
1503 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1504 return SDValue(E, 0);
1506 SDNode *N = new (NodeAllocator) SrcValueSDNode(V);
1507 CSEMap.InsertNode(N, IP);
1508 AllNodes.push_back(N);
1509 return SDValue(N, 0);
1512 /// getMDNode - Return an MDNodeSDNode which holds an MDNode.
1513 SDValue SelectionDAG::getMDNode(const MDNode *MD) {
1514 FoldingSetNodeID ID;
1515 AddNodeIDNode(ID, ISD::MDNODE_SDNODE, getVTList(MVT::Other), 0, 0);
1519 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
1520 return SDValue(E, 0);
1522 SDNode *N = new (NodeAllocator) MDNodeSDNode(MD);
1523 CSEMap.InsertNode(N, IP);
1524 AllNodes.push_back(N);
1525 return SDValue(N, 0);
1529 /// getShiftAmountOperand - Return the specified value casted to
1530 /// the target's desired shift amount type.
1531 SDValue SelectionDAG::getShiftAmountOperand(EVT LHSTy, SDValue Op) {
1532 EVT OpTy = Op.getValueType();
1533 MVT ShTy = TLI.getShiftAmountTy(LHSTy);
1534 if (OpTy == ShTy || OpTy.isVector()) return Op;
1536 ISD::NodeType Opcode = OpTy.bitsGT(ShTy) ? ISD::TRUNCATE : ISD::ZERO_EXTEND;
1537 return getNode(Opcode, Op.getDebugLoc(), ShTy, Op);
1540 /// CreateStackTemporary - Create a stack temporary, suitable for holding the
1541 /// specified value type.
1542 SDValue SelectionDAG::CreateStackTemporary(EVT VT, unsigned minAlign) {
1543 MachineFrameInfo *FrameInfo = getMachineFunction().getFrameInfo();
1544 unsigned ByteSize = VT.getStoreSize();
1545 Type *Ty = VT.getTypeForEVT(*getContext());
1546 unsigned StackAlign =
1547 std::max((unsigned)TLI.getDataLayout()->getPrefTypeAlignment(Ty), minAlign);
1549 int FrameIdx = FrameInfo->CreateStackObject(ByteSize, StackAlign, false);
1550 return getFrameIndex(FrameIdx, TLI.getPointerTy());
1553 /// CreateStackTemporary - Create a stack temporary suitable for holding
1554 /// either of the specified value types.
1555 SDValue SelectionDAG::CreateStackTemporary(EVT VT1, EVT VT2) {
1556 unsigned Bytes = std::max(VT1.getStoreSizeInBits(),
1557 VT2.getStoreSizeInBits())/8;
1558 Type *Ty1 = VT1.getTypeForEVT(*getContext());
1559 Type *Ty2 = VT2.getTypeForEVT(*getContext());
1560 const DataLayout *TD = TLI.getDataLayout();
1561 unsigned Align = std::max(TD->getPrefTypeAlignment(Ty1),
1562 TD->getPrefTypeAlignment(Ty2));
1564 MachineFrameInfo *FrameInfo = getMachineFunction().getFrameInfo();
1565 int FrameIdx = FrameInfo->CreateStackObject(Bytes, Align, false);
1566 return getFrameIndex(FrameIdx, TLI.getPointerTy());
1569 SDValue SelectionDAG::FoldSetCC(EVT VT, SDValue N1,
1570 SDValue N2, ISD::CondCode Cond, DebugLoc dl) {
1571 // These setcc operations always fold.
1575 case ISD::SETFALSE2: return getConstant(0, VT);
1577 case ISD::SETTRUE2: return getConstant(1, VT);
1589 assert(!N1.getValueType().isInteger() && "Illegal setcc for integer!");
1593 if (ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.getNode())) {
1594 const APInt &C2 = N2C->getAPIntValue();
1595 if (ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.getNode())) {
1596 const APInt &C1 = N1C->getAPIntValue();
1599 default: llvm_unreachable("Unknown integer setcc!");
1600 case ISD::SETEQ: return getConstant(C1 == C2, VT);
1601 case ISD::SETNE: return getConstant(C1 != C2, VT);
1602 case ISD::SETULT: return getConstant(C1.ult(C2), VT);
1603 case ISD::SETUGT: return getConstant(C1.ugt(C2), VT);
1604 case ISD::SETULE: return getConstant(C1.ule(C2), VT);
1605 case ISD::SETUGE: return getConstant(C1.uge(C2), VT);
1606 case ISD::SETLT: return getConstant(C1.slt(C2), VT);
1607 case ISD::SETGT: return getConstant(C1.sgt(C2), VT);
1608 case ISD::SETLE: return getConstant(C1.sle(C2), VT);
1609 case ISD::SETGE: return getConstant(C1.sge(C2), VT);
1613 if (ConstantFPSDNode *N1C = dyn_cast<ConstantFPSDNode>(N1.getNode())) {
1614 if (ConstantFPSDNode *N2C = dyn_cast<ConstantFPSDNode>(N2.getNode())) {
1615 // No compile time operations on this type yet.
1616 if (N1C->getValueType(0) == MVT::ppcf128)
1619 APFloat::cmpResult R = N1C->getValueAPF().compare(N2C->getValueAPF());
1622 case ISD::SETEQ: if (R==APFloat::cmpUnordered)
1623 return getUNDEF(VT);
1625 case ISD::SETOEQ: return getConstant(R==APFloat::cmpEqual, VT);
1626 case ISD::SETNE: if (R==APFloat::cmpUnordered)
1627 return getUNDEF(VT);
1629 case ISD::SETONE: return getConstant(R==APFloat::cmpGreaterThan ||
1630 R==APFloat::cmpLessThan, VT);
1631 case ISD::SETLT: if (R==APFloat::cmpUnordered)
1632 return getUNDEF(VT);
1634 case ISD::SETOLT: return getConstant(R==APFloat::cmpLessThan, VT);
1635 case ISD::SETGT: if (R==APFloat::cmpUnordered)
1636 return getUNDEF(VT);
1638 case ISD::SETOGT: return getConstant(R==APFloat::cmpGreaterThan, VT);
1639 case ISD::SETLE: if (R==APFloat::cmpUnordered)
1640 return getUNDEF(VT);
1642 case ISD::SETOLE: return getConstant(R==APFloat::cmpLessThan ||
1643 R==APFloat::cmpEqual, VT);
1644 case ISD::SETGE: if (R==APFloat::cmpUnordered)
1645 return getUNDEF(VT);
1647 case ISD::SETOGE: return getConstant(R==APFloat::cmpGreaterThan ||
1648 R==APFloat::cmpEqual, VT);
1649 case ISD::SETO: return getConstant(R!=APFloat::cmpUnordered, VT);
1650 case ISD::SETUO: return getConstant(R==APFloat::cmpUnordered, VT);
1651 case ISD::SETUEQ: return getConstant(R==APFloat::cmpUnordered ||
1652 R==APFloat::cmpEqual, VT);
1653 case ISD::SETUNE: return getConstant(R!=APFloat::cmpEqual, VT);
1654 case ISD::SETULT: return getConstant(R==APFloat::cmpUnordered ||
1655 R==APFloat::cmpLessThan, VT);
1656 case ISD::SETUGT: return getConstant(R==APFloat::cmpGreaterThan ||
1657 R==APFloat::cmpUnordered, VT);
1658 case ISD::SETULE: return getConstant(R!=APFloat::cmpGreaterThan, VT);
1659 case ISD::SETUGE: return getConstant(R!=APFloat::cmpLessThan, VT);
1662 // Ensure that the constant occurs on the RHS.
1663 return getSetCC(dl, VT, N2, N1, ISD::getSetCCSwappedOperands(Cond));
1667 // Could not fold it.
1671 /// SignBitIsZero - Return true if the sign bit of Op is known to be zero. We
1672 /// use this predicate to simplify operations downstream.
1673 bool SelectionDAG::SignBitIsZero(SDValue Op, unsigned Depth) const {
1674 // This predicate is not safe for vector operations.
1675 if (Op.getValueType().isVector())
1678 unsigned BitWidth = Op.getValueType().getScalarType().getSizeInBits();
1679 return MaskedValueIsZero(Op, APInt::getSignBit(BitWidth), Depth);
1682 /// MaskedValueIsZero - Return true if 'V & Mask' is known to be zero. We use
1683 /// this predicate to simplify operations downstream. Mask is known to be zero
1684 /// for bits that V cannot have.
1685 bool SelectionDAG::MaskedValueIsZero(SDValue Op, const APInt &Mask,
1686 unsigned Depth) const {
1687 APInt KnownZero, KnownOne;
1688 ComputeMaskedBits(Op, KnownZero, KnownOne, Depth);
1689 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1690 return (KnownZero & Mask) == Mask;
1693 /// ComputeMaskedBits - Determine which of the bits specified in Mask are
1694 /// known to be either zero or one and return them in the KnownZero/KnownOne
1695 /// bitsets. This code only analyzes bits in Mask, in order to short-circuit
1697 void SelectionDAG::ComputeMaskedBits(SDValue Op, APInt &KnownZero,
1698 APInt &KnownOne, unsigned Depth) const {
1699 unsigned BitWidth = Op.getValueType().getScalarType().getSizeInBits();
1701 KnownZero = KnownOne = APInt(BitWidth, 0); // Don't know anything.
1703 return; // Limit search depth.
1705 APInt KnownZero2, KnownOne2;
1707 switch (Op.getOpcode()) {
1709 // We know all of the bits for a constant!
1710 KnownOne = cast<ConstantSDNode>(Op)->getAPIntValue();
1711 KnownZero = ~KnownOne;
1714 // If either the LHS or the RHS are Zero, the result is zero.
1715 ComputeMaskedBits(Op.getOperand(1), KnownZero, KnownOne, Depth+1);
1716 ComputeMaskedBits(Op.getOperand(0), KnownZero2, KnownOne2, Depth+1);
1717 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1718 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1720 // Output known-1 bits are only known if set in both the LHS & RHS.
1721 KnownOne &= KnownOne2;
1722 // Output known-0 are known to be clear if zero in either the LHS | RHS.
1723 KnownZero |= KnownZero2;
1726 ComputeMaskedBits(Op.getOperand(1), KnownZero, KnownOne, Depth+1);
1727 ComputeMaskedBits(Op.getOperand(0), KnownZero2, KnownOne2, Depth+1);
1728 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1729 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1731 // Output known-0 bits are only known if clear in both the LHS & RHS.
1732 KnownZero &= KnownZero2;
1733 // Output known-1 are known to be set if set in either the LHS | RHS.
1734 KnownOne |= KnownOne2;
1737 ComputeMaskedBits(Op.getOperand(1), KnownZero, KnownOne, Depth+1);
1738 ComputeMaskedBits(Op.getOperand(0), KnownZero2, KnownOne2, Depth+1);
1739 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1740 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1742 // Output known-0 bits are known if clear or set in both the LHS & RHS.
1743 APInt KnownZeroOut = (KnownZero & KnownZero2) | (KnownOne & KnownOne2);
1744 // Output known-1 are known to be set if set in only one of the LHS, RHS.
1745 KnownOne = (KnownZero & KnownOne2) | (KnownOne & KnownZero2);
1746 KnownZero = KnownZeroOut;
1750 ComputeMaskedBits(Op.getOperand(1), KnownZero, KnownOne, Depth+1);
1751 ComputeMaskedBits(Op.getOperand(0), KnownZero2, KnownOne2, Depth+1);
1752 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1753 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1755 // If low bits are zero in either operand, output low known-0 bits.
1756 // Also compute a conserative estimate for high known-0 bits.
1757 // More trickiness is possible, but this is sufficient for the
1758 // interesting case of alignment computation.
1759 KnownOne.clearAllBits();
1760 unsigned TrailZ = KnownZero.countTrailingOnes() +
1761 KnownZero2.countTrailingOnes();
1762 unsigned LeadZ = std::max(KnownZero.countLeadingOnes() +
1763 KnownZero2.countLeadingOnes(),
1764 BitWidth) - BitWidth;
1766 TrailZ = std::min(TrailZ, BitWidth);
1767 LeadZ = std::min(LeadZ, BitWidth);
1768 KnownZero = APInt::getLowBitsSet(BitWidth, TrailZ) |
1769 APInt::getHighBitsSet(BitWidth, LeadZ);
1773 // For the purposes of computing leading zeros we can conservatively
1774 // treat a udiv as a logical right shift by the power of 2 known to
1775 // be less than the denominator.
1776 ComputeMaskedBits(Op.getOperand(0), KnownZero2, KnownOne2, Depth+1);
1777 unsigned LeadZ = KnownZero2.countLeadingOnes();
1779 KnownOne2.clearAllBits();
1780 KnownZero2.clearAllBits();
1781 ComputeMaskedBits(Op.getOperand(1), KnownZero2, KnownOne2, Depth+1);
1782 unsigned RHSUnknownLeadingOnes = KnownOne2.countLeadingZeros();
1783 if (RHSUnknownLeadingOnes != BitWidth)
1784 LeadZ = std::min(BitWidth,
1785 LeadZ + BitWidth - RHSUnknownLeadingOnes - 1);
1787 KnownZero = APInt::getHighBitsSet(BitWidth, LeadZ);
1791 ComputeMaskedBits(Op.getOperand(2), KnownZero, KnownOne, Depth+1);
1792 ComputeMaskedBits(Op.getOperand(1), KnownZero2, KnownOne2, Depth+1);
1793 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1794 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1796 // Only known if known in both the LHS and RHS.
1797 KnownOne &= KnownOne2;
1798 KnownZero &= KnownZero2;
1800 case ISD::SELECT_CC:
1801 ComputeMaskedBits(Op.getOperand(3), KnownZero, KnownOne, Depth+1);
1802 ComputeMaskedBits(Op.getOperand(2), KnownZero2, KnownOne2, Depth+1);
1803 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1804 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
1806 // Only known if known in both the LHS and RHS.
1807 KnownOne &= KnownOne2;
1808 KnownZero &= KnownZero2;
1816 if (Op.getResNo() != 1)
1818 // The boolean result conforms to getBooleanContents. Fall through.
1820 // If we know the result of a setcc has the top bits zero, use this info.
1821 if (TLI.getBooleanContents(Op.getValueType().isVector()) ==
1822 TargetLowering::ZeroOrOneBooleanContent && BitWidth > 1)
1823 KnownZero |= APInt::getHighBitsSet(BitWidth, BitWidth - 1);
1826 // (shl X, C1) & C2 == 0 iff (X & C2 >>u C1) == 0
1827 if (ConstantSDNode *SA = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
1828 unsigned ShAmt = SA->getZExtValue();
1830 // If the shift count is an invalid immediate, don't do anything.
1831 if (ShAmt >= BitWidth)
1834 ComputeMaskedBits(Op.getOperand(0), KnownZero, KnownOne, Depth+1);
1835 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1836 KnownZero <<= ShAmt;
1838 // low bits known zero.
1839 KnownZero |= APInt::getLowBitsSet(BitWidth, ShAmt);
1843 // (ushr X, C1) & C2 == 0 iff (-1 >> C1) & C2 == 0
1844 if (ConstantSDNode *SA = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
1845 unsigned ShAmt = SA->getZExtValue();
1847 // If the shift count is an invalid immediate, don't do anything.
1848 if (ShAmt >= BitWidth)
1851 ComputeMaskedBits(Op.getOperand(0), KnownZero, KnownOne, Depth+1);
1852 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1853 KnownZero = KnownZero.lshr(ShAmt);
1854 KnownOne = KnownOne.lshr(ShAmt);
1856 APInt HighBits = APInt::getHighBitsSet(BitWidth, ShAmt);
1857 KnownZero |= HighBits; // High bits known zero.
1861 if (ConstantSDNode *SA = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
1862 unsigned ShAmt = SA->getZExtValue();
1864 // If the shift count is an invalid immediate, don't do anything.
1865 if (ShAmt >= BitWidth)
1868 // If any of the demanded bits are produced by the sign extension, we also
1869 // demand the input sign bit.
1870 APInt HighBits = APInt::getHighBitsSet(BitWidth, ShAmt);
1872 ComputeMaskedBits(Op.getOperand(0), KnownZero, KnownOne, Depth+1);
1873 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1874 KnownZero = KnownZero.lshr(ShAmt);
1875 KnownOne = KnownOne.lshr(ShAmt);
1877 // Handle the sign bits.
1878 APInt SignBit = APInt::getSignBit(BitWidth);
1879 SignBit = SignBit.lshr(ShAmt); // Adjust to where it is now in the mask.
1881 if (KnownZero.intersects(SignBit)) {
1882 KnownZero |= HighBits; // New bits are known zero.
1883 } else if (KnownOne.intersects(SignBit)) {
1884 KnownOne |= HighBits; // New bits are known one.
1888 case ISD::SIGN_EXTEND_INREG: {
1889 EVT EVT = cast<VTSDNode>(Op.getOperand(1))->getVT();
1890 unsigned EBits = EVT.getScalarType().getSizeInBits();
1892 // Sign extension. Compute the demanded bits in the result that are not
1893 // present in the input.
1894 APInt NewBits = APInt::getHighBitsSet(BitWidth, BitWidth - EBits);
1896 APInt InSignBit = APInt::getSignBit(EBits);
1897 APInt InputDemandedBits = APInt::getLowBitsSet(BitWidth, EBits);
1899 // If the sign extended bits are demanded, we know that the sign
1901 InSignBit = InSignBit.zext(BitWidth);
1902 if (NewBits.getBoolValue())
1903 InputDemandedBits |= InSignBit;
1905 ComputeMaskedBits(Op.getOperand(0), KnownZero, KnownOne, Depth+1);
1906 KnownOne &= InputDemandedBits;
1907 KnownZero &= InputDemandedBits;
1908 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
1910 // If the sign bit of the input is known set or clear, then we know the
1911 // top bits of the result.
1912 if (KnownZero.intersects(InSignBit)) { // Input sign bit known clear
1913 KnownZero |= NewBits;
1914 KnownOne &= ~NewBits;
1915 } else if (KnownOne.intersects(InSignBit)) { // Input sign bit known set
1916 KnownOne |= NewBits;
1917 KnownZero &= ~NewBits;
1918 } else { // Input sign bit unknown
1919 KnownZero &= ~NewBits;
1920 KnownOne &= ~NewBits;
1925 case ISD::CTTZ_ZERO_UNDEF:
1927 case ISD::CTLZ_ZERO_UNDEF:
1929 unsigned LowBits = Log2_32(BitWidth)+1;
1930 KnownZero = APInt::getHighBitsSet(BitWidth, BitWidth - LowBits);
1931 KnownOne.clearAllBits();
1935 LoadSDNode *LD = cast<LoadSDNode>(Op);
1936 if (ISD::isZEXTLoad(Op.getNode())) {
1937 EVT VT = LD->getMemoryVT();
1938 unsigned MemBits = VT.getScalarType().getSizeInBits();
1939 KnownZero |= APInt::getHighBitsSet(BitWidth, BitWidth - MemBits);
1940 } else if (const MDNode *Ranges = LD->getRanges()) {
1941 computeMaskedBitsLoad(*Ranges, KnownZero);
1945 case ISD::ZERO_EXTEND: {
1946 EVT InVT = Op.getOperand(0).getValueType();
1947 unsigned InBits = InVT.getScalarType().getSizeInBits();
1948 APInt NewBits = APInt::getHighBitsSet(BitWidth, BitWidth - InBits);
1949 KnownZero = KnownZero.trunc(InBits);
1950 KnownOne = KnownOne.trunc(InBits);
1951 ComputeMaskedBits(Op.getOperand(0), KnownZero, KnownOne, Depth+1);
1952 KnownZero = KnownZero.zext(BitWidth);
1953 KnownOne = KnownOne.zext(BitWidth);
1954 KnownZero |= NewBits;
1957 case ISD::SIGN_EXTEND: {
1958 EVT InVT = Op.getOperand(0).getValueType();
1959 unsigned InBits = InVT.getScalarType().getSizeInBits();
1960 APInt InSignBit = APInt::getSignBit(InBits);
1961 APInt NewBits = APInt::getHighBitsSet(BitWidth, BitWidth - InBits);
1963 KnownZero = KnownZero.trunc(InBits);
1964 KnownOne = KnownOne.trunc(InBits);
1965 ComputeMaskedBits(Op.getOperand(0), KnownZero, KnownOne, Depth+1);
1967 // Note if the sign bit is known to be zero or one.
1968 bool SignBitKnownZero = KnownZero.isNegative();
1969 bool SignBitKnownOne = KnownOne.isNegative();
1970 assert(!(SignBitKnownZero && SignBitKnownOne) &&
1971 "Sign bit can't be known to be both zero and one!");
1973 KnownZero = KnownZero.zext(BitWidth);
1974 KnownOne = KnownOne.zext(BitWidth);
1976 // If the sign bit is known zero or one, the top bits match.
1977 if (SignBitKnownZero)
1978 KnownZero |= NewBits;
1979 else if (SignBitKnownOne)
1980 KnownOne |= NewBits;
1983 case ISD::ANY_EXTEND: {
1984 EVT InVT = Op.getOperand(0).getValueType();
1985 unsigned InBits = InVT.getScalarType().getSizeInBits();
1986 KnownZero = KnownZero.trunc(InBits);
1987 KnownOne = KnownOne.trunc(InBits);
1988 ComputeMaskedBits(Op.getOperand(0), KnownZero, KnownOne, Depth+1);
1989 KnownZero = KnownZero.zext(BitWidth);
1990 KnownOne = KnownOne.zext(BitWidth);
1993 case ISD::TRUNCATE: {
1994 EVT InVT = Op.getOperand(0).getValueType();
1995 unsigned InBits = InVT.getScalarType().getSizeInBits();
1996 KnownZero = KnownZero.zext(InBits);
1997 KnownOne = KnownOne.zext(InBits);
1998 ComputeMaskedBits(Op.getOperand(0), KnownZero, KnownOne, Depth+1);
1999 assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
2000 KnownZero = KnownZero.trunc(BitWidth);
2001 KnownOne = KnownOne.trunc(BitWidth);
2004 case ISD::AssertZext: {
2005 EVT VT = cast<VTSDNode>(Op.getOperand(1))->getVT();
2006 APInt InMask = APInt::getLowBitsSet(BitWidth, VT.getSizeInBits());
2007 ComputeMaskedBits(Op.getOperand(0), KnownZero, KnownOne, Depth+1);
2008 KnownZero |= (~InMask);
2009 KnownOne &= (~KnownZero);
2013 // All bits are zero except the low bit.
2014 KnownZero = APInt::getHighBitsSet(BitWidth, BitWidth - 1);
2018 if (ConstantSDNode *CLHS = dyn_cast<ConstantSDNode>(Op.getOperand(0))) {
2019 // We know that the top bits of C-X are clear if X contains less bits
2020 // than C (i.e. no wrap-around can happen). For example, 20-X is
2021 // positive if we can prove that X is >= 0 and < 16.
2022 if (CLHS->getAPIntValue().isNonNegative()) {
2023 unsigned NLZ = (CLHS->getAPIntValue()+1).countLeadingZeros();
2024 // NLZ can't be BitWidth with no sign bit
2025 APInt MaskV = APInt::getHighBitsSet(BitWidth, NLZ+1);
2026 ComputeMaskedBits(Op.getOperand(1), KnownZero2, KnownOne2, Depth+1);
2028 // If all of the MaskV bits are known to be zero, then we know the
2029 // output top bits are zero, because we now know that the output is
2031 if ((KnownZero2 & MaskV) == MaskV) {
2032 unsigned NLZ2 = CLHS->getAPIntValue().countLeadingZeros();
2033 // Top bits known zero.
2034 KnownZero = APInt::getHighBitsSet(BitWidth, NLZ2);
2042 // Output known-0 bits are known if clear or set in both the low clear bits
2043 // common to both LHS & RHS. For example, 8+(X<<3) is known to have the
2044 // low 3 bits clear.
2045 ComputeMaskedBits(Op.getOperand(0), KnownZero2, KnownOne2, Depth+1);
2046 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
2047 unsigned KnownZeroOut = KnownZero2.countTrailingOnes();
2049 ComputeMaskedBits(Op.getOperand(1), KnownZero2, KnownOne2, Depth+1);
2050 assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
2051 KnownZeroOut = std::min(KnownZeroOut,
2052 KnownZero2.countTrailingOnes());
2054 if (Op.getOpcode() == ISD::ADD) {
2055 KnownZero |= APInt::getLowBitsSet(BitWidth, KnownZeroOut);
2059 // With ADDE, a carry bit may be added in, so we can only use this
2060 // information if we know (at least) that the low two bits are clear. We
2061 // then return to the caller that the low bit is unknown but that other bits
2063 if (KnownZeroOut >= 2) // ADDE
2064 KnownZero |= APInt::getBitsSet(BitWidth, 1, KnownZeroOut);
2068 if (ConstantSDNode *Rem = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
2069 const APInt &RA = Rem->getAPIntValue().abs();
2070 if (RA.isPowerOf2()) {
2071 APInt LowBits = RA - 1;
2072 APInt Mask2 = LowBits | APInt::getSignBit(BitWidth);
2073 ComputeMaskedBits(Op.getOperand(0), KnownZero2,KnownOne2,Depth+1);
2075 // The low bits of the first operand are unchanged by the srem.
2076 KnownZero = KnownZero2 & LowBits;
2077 KnownOne = KnownOne2 & LowBits;
2079 // If the first operand is non-negative or has all low bits zero, then
2080 // the upper bits are all zero.
2081 if (KnownZero2[BitWidth-1] || ((KnownZero2 & LowBits) == LowBits))
2082 KnownZero |= ~LowBits;
2084 // If the first operand is negative and not all low bits are zero, then
2085 // the upper bits are all one.
2086 if (KnownOne2[BitWidth-1] && ((KnownOne2 & LowBits) != 0))
2087 KnownOne |= ~LowBits;
2088 assert((KnownZero & KnownOne) == 0&&"Bits known to be one AND zero?");
2093 if (ConstantSDNode *Rem = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
2094 const APInt &RA = Rem->getAPIntValue();
2095 if (RA.isPowerOf2()) {
2096 APInt LowBits = (RA - 1);
2097 KnownZero |= ~LowBits;
2098 ComputeMaskedBits(Op.getOperand(0), KnownZero, KnownOne,Depth+1);
2099 assert((KnownZero & KnownOne) == 0&&"Bits known to be one AND zero?");
2104 // Since the result is less than or equal to either operand, any leading
2105 // zero bits in either operand must also exist in the result.
2106 ComputeMaskedBits(Op.getOperand(0), KnownZero, KnownOne, Depth+1);
2107 ComputeMaskedBits(Op.getOperand(1), KnownZero2, KnownOne2, Depth+1);
2109 uint32_t Leaders = std::max(KnownZero.countLeadingOnes(),
2110 KnownZero2.countLeadingOnes());
2111 KnownOne.clearAllBits();
2112 KnownZero = APInt::getHighBitsSet(BitWidth, Leaders);
2115 case ISD::FrameIndex:
2116 case ISD::TargetFrameIndex:
2117 if (unsigned Align = InferPtrAlignment(Op)) {
2118 // The low bits are known zero if the pointer is aligned.
2119 KnownZero = APInt::getLowBitsSet(BitWidth, Log2_32(Align));
2125 if (Op.getOpcode() < ISD::BUILTIN_OP_END)
2128 case ISD::INTRINSIC_WO_CHAIN:
2129 case ISD::INTRINSIC_W_CHAIN:
2130 case ISD::INTRINSIC_VOID:
2131 // Allow the target to implement this method for its nodes.
2132 TLI.computeMaskedBitsForTargetNode(Op, KnownZero, KnownOne, *this, Depth);
2137 /// ComputeNumSignBits - Return the number of times the sign bit of the
2138 /// register is replicated into the other bits. We know that at least 1 bit
2139 /// is always equal to the sign bit (itself), but other cases can give us
2140 /// information. For example, immediately after an "SRA X, 2", we know that
2141 /// the top 3 bits are all equal to each other, so we return 3.
2142 unsigned SelectionDAG::ComputeNumSignBits(SDValue Op, unsigned Depth) const{
2143 EVT VT = Op.getValueType();
2144 assert(VT.isInteger() && "Invalid VT!");
2145 unsigned VTBits = VT.getScalarType().getSizeInBits();
2147 unsigned FirstAnswer = 1;
2150 return 1; // Limit search depth.
2152 switch (Op.getOpcode()) {
2154 case ISD::AssertSext:
2155 Tmp = cast<VTSDNode>(Op.getOperand(1))->getVT().getSizeInBits();
2156 return VTBits-Tmp+1;
2157 case ISD::AssertZext:
2158 Tmp = cast<VTSDNode>(Op.getOperand(1))->getVT().getSizeInBits();
2161 case ISD::Constant: {
2162 const APInt &Val = cast<ConstantSDNode>(Op)->getAPIntValue();
2163 return Val.getNumSignBits();
2166 case ISD::SIGN_EXTEND:
2167 Tmp = VTBits-Op.getOperand(0).getValueType().getScalarType().getSizeInBits();
2168 return ComputeNumSignBits(Op.getOperand(0), Depth+1) + Tmp;
2170 case ISD::SIGN_EXTEND_INREG:
2171 // Max of the input and what this extends.
2173 cast<VTSDNode>(Op.getOperand(1))->getVT().getScalarType().getSizeInBits();
2176 Tmp2 = ComputeNumSignBits(Op.getOperand(0), Depth+1);
2177 return std::max(Tmp, Tmp2);
2180 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
2181 // SRA X, C -> adds C sign bits.
2182 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
2183 Tmp += C->getZExtValue();
2184 if (Tmp > VTBits) Tmp = VTBits;
2188 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
2189 // shl destroys sign bits.
2190 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
2191 if (C->getZExtValue() >= VTBits || // Bad shift.
2192 C->getZExtValue() >= Tmp) break; // Shifted all sign bits out.
2193 return Tmp - C->getZExtValue();
2198 case ISD::XOR: // NOT is handled here.
2199 // Logical binary ops preserve the number of sign bits at the worst.
2200 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
2202 Tmp2 = ComputeNumSignBits(Op.getOperand(1), Depth+1);
2203 FirstAnswer = std::min(Tmp, Tmp2);
2204 // We computed what we know about the sign bits as our first
2205 // answer. Now proceed to the generic code that uses
2206 // ComputeMaskedBits, and pick whichever answer is better.
2211 Tmp = ComputeNumSignBits(Op.getOperand(1), Depth+1);
2212 if (Tmp == 1) return 1; // Early out.
2213 Tmp2 = ComputeNumSignBits(Op.getOperand(2), Depth+1);
2214 return std::min(Tmp, Tmp2);
2222 if (Op.getResNo() != 1)
2224 // The boolean result conforms to getBooleanContents. Fall through.
2226 // If setcc returns 0/-1, all bits are sign bits.
2227 if (TLI.getBooleanContents(Op.getValueType().isVector()) ==
2228 TargetLowering::ZeroOrNegativeOneBooleanContent)
2233 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
2234 unsigned RotAmt = C->getZExtValue() & (VTBits-1);
2236 // Handle rotate right by N like a rotate left by 32-N.
2237 if (Op.getOpcode() == ISD::ROTR)
2238 RotAmt = (VTBits-RotAmt) & (VTBits-1);
2240 // If we aren't rotating out all of the known-in sign bits, return the
2241 // number that are left. This handles rotl(sext(x), 1) for example.
2242 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
2243 if (Tmp > RotAmt+1) return Tmp-RotAmt;
2247 // Add can have at most one carry bit. Thus we know that the output
2248 // is, at worst, one more bit than the inputs.
2249 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
2250 if (Tmp == 1) return 1; // Early out.
2252 // Special case decrementing a value (ADD X, -1):
2253 if (ConstantSDNode *CRHS = dyn_cast<ConstantSDNode>(Op.getOperand(1)))
2254 if (CRHS->isAllOnesValue()) {
2255 APInt KnownZero, KnownOne;
2256 ComputeMaskedBits(Op.getOperand(0), KnownZero, KnownOne, Depth+1);
2258 // If the input is known to be 0 or 1, the output is 0/-1, which is all
2260 if ((KnownZero | APInt(VTBits, 1)).isAllOnesValue())
2263 // If we are subtracting one from a positive number, there is no carry
2264 // out of the result.
2265 if (KnownZero.isNegative())
2269 Tmp2 = ComputeNumSignBits(Op.getOperand(1), Depth+1);
2270 if (Tmp2 == 1) return 1;
2271 return std::min(Tmp, Tmp2)-1;
2274 Tmp2 = ComputeNumSignBits(Op.getOperand(1), Depth+1);
2275 if (Tmp2 == 1) return 1;
2278 if (ConstantSDNode *CLHS = dyn_cast<ConstantSDNode>(Op.getOperand(0)))
2279 if (CLHS->isNullValue()) {
2280 APInt KnownZero, KnownOne;
2281 ComputeMaskedBits(Op.getOperand(1), KnownZero, KnownOne, Depth+1);
2282 // If the input is known to be 0 or 1, the output is 0/-1, which is all
2284 if ((KnownZero | APInt(VTBits, 1)).isAllOnesValue())
2287 // If the input is known to be positive (the sign bit is known clear),
2288 // the output of the NEG has the same number of sign bits as the input.
2289 if (KnownZero.isNegative())
2292 // Otherwise, we treat this like a SUB.
2295 // Sub can have at most one carry bit. Thus we know that the output
2296 // is, at worst, one more bit than the inputs.
2297 Tmp = ComputeNumSignBits(Op.getOperand(0), Depth+1);
2298 if (Tmp == 1) return 1; // Early out.
2299 return std::min(Tmp, Tmp2)-1;
2301 // FIXME: it's tricky to do anything useful for this, but it is an important
2302 // case for targets like X86.
2306 // Handle LOADX separately here. EXTLOAD case will fallthrough.
2307 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(Op)) {
2308 unsigned ExtType = LD->getExtensionType();
2311 case ISD::SEXTLOAD: // '17' bits known
2312 Tmp = LD->getMemoryVT().getScalarType().getSizeInBits();
2313 return VTBits-Tmp+1;
2314 case ISD::ZEXTLOAD: // '16' bits known
2315 Tmp = LD->getMemoryVT().getScalarType().getSizeInBits();
2320 // Allow the target to implement this method for its nodes.
2321 if (Op.getOpcode() >= ISD::BUILTIN_OP_END ||
2322 Op.getOpcode() == ISD::INTRINSIC_WO_CHAIN ||
2323 Op.getOpcode() == ISD::INTRINSIC_W_CHAIN ||
2324 Op.getOpcode() == ISD::INTRINSIC_VOID) {
2325 unsigned NumBits = TLI.ComputeNumSignBitsForTargetNode(Op, Depth);
2326 if (NumBits > 1) FirstAnswer = std::max(FirstAnswer, NumBits);
2329 // Finally, if we can prove that the top bits of the result are 0's or 1's,
2330 // use this information.
2331 APInt KnownZero, KnownOne;
2332 ComputeMaskedBits(Op, KnownZero, KnownOne, Depth);
2335 if (KnownZero.isNegative()) { // sign bit is 0
2337 } else if (KnownOne.isNegative()) { // sign bit is 1;
2344 // Okay, we know that the sign bit in Mask is set. Use CLZ to determine
2345 // the number of identical bits in the top of the input value.
2347 Mask <<= Mask.getBitWidth()-VTBits;
2348 // Return # leading zeros. We use 'min' here in case Val was zero before
2349 // shifting. We don't want to return '64' as for an i32 "0".
2350 return std::max(FirstAnswer, std::min(VTBits, Mask.countLeadingZeros()));
2353 /// isBaseWithConstantOffset - Return true if the specified operand is an
2354 /// ISD::ADD with a ConstantSDNode on the right-hand side, or if it is an
2355 /// ISD::OR with a ConstantSDNode that is guaranteed to have the same
2356 /// semantics as an ADD. This handles the equivalence:
2357 /// X|Cst == X+Cst iff X&Cst = 0.
2358 bool SelectionDAG::isBaseWithConstantOffset(SDValue Op) const {
2359 if ((Op.getOpcode() != ISD::ADD && Op.getOpcode() != ISD::OR) ||
2360 !isa<ConstantSDNode>(Op.getOperand(1)))
2363 if (Op.getOpcode() == ISD::OR &&
2364 !MaskedValueIsZero(Op.getOperand(0),
2365 cast<ConstantSDNode>(Op.getOperand(1))->getAPIntValue()))
2372 bool SelectionDAG::isKnownNeverNaN(SDValue Op) const {
2373 // If we're told that NaNs won't happen, assume they won't.
2374 if (getTarget().Options.NoNaNsFPMath)
2377 // If the value is a constant, we can obviously see if it is a NaN or not.
2378 if (const ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(Op))
2379 return !C->getValueAPF().isNaN();
2381 // TODO: Recognize more cases here.
2386 bool SelectionDAG::isKnownNeverZero(SDValue Op) const {
2387 // If the value is a constant, we can obviously see if it is a zero or not.
2388 if (const ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(Op))
2389 return !C->isZero();
2391 // TODO: Recognize more cases here.
2392 switch (Op.getOpcode()) {
2395 if (const ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1)))
2396 return !C->isNullValue();
2403 bool SelectionDAG::isEqualTo(SDValue A, SDValue B) const {
2404 // Check the obvious case.
2405 if (A == B) return true;
2407 // For for negative and positive zero.
2408 if (const ConstantFPSDNode *CA = dyn_cast<ConstantFPSDNode>(A))
2409 if (const ConstantFPSDNode *CB = dyn_cast<ConstantFPSDNode>(B))
2410 if (CA->isZero() && CB->isZero()) return true;
2412 // Otherwise they may not be equal.
2416 /// getNode - Gets or creates the specified node.
2418 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT) {
2419 FoldingSetNodeID ID;
2420 AddNodeIDNode(ID, Opcode, getVTList(VT), 0, 0);
2422 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
2423 return SDValue(E, 0);
2425 SDNode *N = new (NodeAllocator) SDNode(Opcode, DL, getVTList(VT));
2426 CSEMap.InsertNode(N, IP);
2428 AllNodes.push_back(N);
2432 return SDValue(N, 0);
2435 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL,
2436 EVT VT, SDValue Operand) {
2437 // Constant fold unary operations with an integer constant operand.
2438 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Operand.getNode())) {
2439 const APInt &Val = C->getAPIntValue();
2442 case ISD::SIGN_EXTEND:
2443 return getConstant(Val.sextOrTrunc(VT.getSizeInBits()), VT);
2444 case ISD::ANY_EXTEND:
2445 case ISD::ZERO_EXTEND:
2447 return getConstant(Val.zextOrTrunc(VT.getSizeInBits()), VT);
2448 case ISD::UINT_TO_FP:
2449 case ISD::SINT_TO_FP: {
2450 // No compile time operations on ppcf128.
2451 if (VT == MVT::ppcf128) break;
2452 APFloat apf(APInt::getNullValue(VT.getSizeInBits()));
2453 (void)apf.convertFromAPInt(Val,
2454 Opcode==ISD::SINT_TO_FP,
2455 APFloat::rmNearestTiesToEven);
2456 return getConstantFP(apf, VT);
2459 if (VT == MVT::f32 && C->getValueType(0) == MVT::i32)
2460 return getConstantFP(APFloat(Val), VT);
2461 else if (VT == MVT::f64 && C->getValueType(0) == MVT::i64)
2462 return getConstantFP(APFloat(Val), VT);
2465 return getConstant(Val.byteSwap(), VT);
2467 return getConstant(Val.countPopulation(), VT);
2469 case ISD::CTLZ_ZERO_UNDEF:
2470 return getConstant(Val.countLeadingZeros(), VT);
2472 case ISD::CTTZ_ZERO_UNDEF:
2473 return getConstant(Val.countTrailingZeros(), VT);
2477 // Constant fold unary operations with a floating point constant operand.
2478 if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(Operand.getNode())) {
2479 APFloat V = C->getValueAPF(); // make copy
2480 if (VT != MVT::ppcf128 && Operand.getValueType() != MVT::ppcf128) {
2484 return getConstantFP(V, VT);
2487 return getConstantFP(V, VT);
2489 APFloat::opStatus fs = V.roundToIntegral(APFloat::rmTowardPositive);
2490 if (fs == APFloat::opOK || fs == APFloat::opInexact)
2491 return getConstantFP(V, VT);
2495 APFloat::opStatus fs = V.roundToIntegral(APFloat::rmTowardZero);
2496 if (fs == APFloat::opOK || fs == APFloat::opInexact)
2497 return getConstantFP(V, VT);
2501 APFloat::opStatus fs = V.roundToIntegral(APFloat::rmTowardNegative);
2502 if (fs == APFloat::opOK || fs == APFloat::opInexact)
2503 return getConstantFP(V, VT);
2506 case ISD::FP_EXTEND: {
2508 // This can return overflow, underflow, or inexact; we don't care.
2509 // FIXME need to be more flexible about rounding mode.
2510 (void)V.convert(*EVTToAPFloatSemantics(VT),
2511 APFloat::rmNearestTiesToEven, &ignored);
2512 return getConstantFP(V, VT);
2514 case ISD::FP_TO_SINT:
2515 case ISD::FP_TO_UINT: {
2518 assert(integerPartWidth >= 64);
2519 // FIXME need to be more flexible about rounding mode.
2520 APFloat::opStatus s = V.convertToInteger(x, VT.getSizeInBits(),
2521 Opcode==ISD::FP_TO_SINT,
2522 APFloat::rmTowardZero, &ignored);
2523 if (s==APFloat::opInvalidOp) // inexact is OK, in fact usual
2525 APInt api(VT.getSizeInBits(), x);
2526 return getConstant(api, VT);
2529 if (VT == MVT::i32 && C->getValueType(0) == MVT::f32)
2530 return getConstant((uint32_t)V.bitcastToAPInt().getZExtValue(), VT);
2531 else if (VT == MVT::i64 && C->getValueType(0) == MVT::f64)
2532 return getConstant(V.bitcastToAPInt().getZExtValue(), VT);
2538 unsigned OpOpcode = Operand.getNode()->getOpcode();
2540 case ISD::TokenFactor:
2541 case ISD::MERGE_VALUES:
2542 case ISD::CONCAT_VECTORS:
2543 return Operand; // Factor, merge or concat of one node? No need.
2544 case ISD::FP_ROUND: llvm_unreachable("Invalid method to make FP_ROUND node");
2545 case ISD::FP_EXTEND:
2546 assert(VT.isFloatingPoint() &&
2547 Operand.getValueType().isFloatingPoint() && "Invalid FP cast!");
2548 if (Operand.getValueType() == VT) return Operand; // noop conversion.
2549 assert((!VT.isVector() ||
2550 VT.getVectorNumElements() ==
2551 Operand.getValueType().getVectorNumElements()) &&
2552 "Vector element count mismatch!");
2553 if (Operand.getOpcode() == ISD::UNDEF)
2554 return getUNDEF(VT);
2556 case ISD::SIGN_EXTEND:
2557 assert(VT.isInteger() && Operand.getValueType().isInteger() &&
2558 "Invalid SIGN_EXTEND!");
2559 if (Operand.getValueType() == VT) return Operand; // noop extension
2560 assert(Operand.getValueType().getScalarType().bitsLT(VT.getScalarType()) &&
2561 "Invalid sext node, dst < src!");
2562 assert((!VT.isVector() ||
2563 VT.getVectorNumElements() ==
2564 Operand.getValueType().getVectorNumElements()) &&
2565 "Vector element count mismatch!");
2566 if (OpOpcode == ISD::SIGN_EXTEND || OpOpcode == ISD::ZERO_EXTEND)
2567 return getNode(OpOpcode, DL, VT, Operand.getNode()->getOperand(0));
2568 else if (OpOpcode == ISD::UNDEF)
2569 // sext(undef) = 0, because the top bits will all be the same.
2570 return getConstant(0, VT);
2572 case ISD::ZERO_EXTEND:
2573 assert(VT.isInteger() && Operand.getValueType().isInteger() &&
2574 "Invalid ZERO_EXTEND!");
2575 if (Operand.getValueType() == VT) return Operand; // noop extension
2576 assert(Operand.getValueType().getScalarType().bitsLT(VT.getScalarType()) &&
2577 "Invalid zext node, dst < src!");
2578 assert((!VT.isVector() ||
2579 VT.getVectorNumElements() ==
2580 Operand.getValueType().getVectorNumElements()) &&
2581 "Vector element count mismatch!");
2582 if (OpOpcode == ISD::ZERO_EXTEND) // (zext (zext x)) -> (zext x)
2583 return getNode(ISD::ZERO_EXTEND, DL, VT,
2584 Operand.getNode()->getOperand(0));
2585 else if (OpOpcode == ISD::UNDEF)
2586 // zext(undef) = 0, because the top bits will be zero.
2587 return getConstant(0, VT);
2589 case ISD::ANY_EXTEND:
2590 assert(VT.isInteger() && Operand.getValueType().isInteger() &&
2591 "Invalid ANY_EXTEND!");
2592 if (Operand.getValueType() == VT) return Operand; // noop extension
2593 assert(Operand.getValueType().getScalarType().bitsLT(VT.getScalarType()) &&
2594 "Invalid anyext node, dst < src!");
2595 assert((!VT.isVector() ||
2596 VT.getVectorNumElements() ==
2597 Operand.getValueType().getVectorNumElements()) &&
2598 "Vector element count mismatch!");
2600 if (OpOpcode == ISD::ZERO_EXTEND || OpOpcode == ISD::SIGN_EXTEND ||
2601 OpOpcode == ISD::ANY_EXTEND)
2602 // (ext (zext x)) -> (zext x) and (ext (sext x)) -> (sext x)
2603 return getNode(OpOpcode, DL, VT, Operand.getNode()->getOperand(0));
2604 else if (OpOpcode == ISD::UNDEF)
2605 return getUNDEF(VT);
2607 // (ext (trunx x)) -> x
2608 if (OpOpcode == ISD::TRUNCATE) {
2609 SDValue OpOp = Operand.getNode()->getOperand(0);
2610 if (OpOp.getValueType() == VT)
2615 assert(VT.isInteger() && Operand.getValueType().isInteger() &&
2616 "Invalid TRUNCATE!");
2617 if (Operand.getValueType() == VT) return Operand; // noop truncate
2618 assert(Operand.getValueType().getScalarType().bitsGT(VT.getScalarType()) &&
2619 "Invalid truncate node, src < dst!");
2620 assert((!VT.isVector() ||
2621 VT.getVectorNumElements() ==
2622 Operand.getValueType().getVectorNumElements()) &&
2623 "Vector element count mismatch!");
2624 if (OpOpcode == ISD::TRUNCATE)
2625 return getNode(ISD::TRUNCATE, DL, VT, Operand.getNode()->getOperand(0));
2626 if (OpOpcode == ISD::ZERO_EXTEND || OpOpcode == ISD::SIGN_EXTEND ||
2627 OpOpcode == ISD::ANY_EXTEND) {
2628 // If the source is smaller than the dest, we still need an extend.
2629 if (Operand.getNode()->getOperand(0).getValueType().getScalarType()
2630 .bitsLT(VT.getScalarType()))
2631 return getNode(OpOpcode, DL, VT, Operand.getNode()->getOperand(0));
2632 if (Operand.getNode()->getOperand(0).getValueType().bitsGT(VT))
2633 return getNode(ISD::TRUNCATE, DL, VT, Operand.getNode()->getOperand(0));
2634 return Operand.getNode()->getOperand(0);
2636 if (OpOpcode == ISD::UNDEF)
2637 return getUNDEF(VT);
2640 // Basic sanity checking.
2641 assert(VT.getSizeInBits() == Operand.getValueType().getSizeInBits()
2642 && "Cannot BITCAST between types of different sizes!");
2643 if (VT == Operand.getValueType()) return Operand; // noop conversion.
2644 if (OpOpcode == ISD::BITCAST) // bitconv(bitconv(x)) -> bitconv(x)
2645 return getNode(ISD::BITCAST, DL, VT, Operand.getOperand(0));
2646 if (OpOpcode == ISD::UNDEF)
2647 return getUNDEF(VT);
2649 case ISD::SCALAR_TO_VECTOR:
2650 assert(VT.isVector() && !Operand.getValueType().isVector() &&
2651 (VT.getVectorElementType() == Operand.getValueType() ||
2652 (VT.getVectorElementType().isInteger() &&
2653 Operand.getValueType().isInteger() &&
2654 VT.getVectorElementType().bitsLE(Operand.getValueType()))) &&
2655 "Illegal SCALAR_TO_VECTOR node!");
2656 if (OpOpcode == ISD::UNDEF)
2657 return getUNDEF(VT);
2658 // scalar_to_vector(extract_vector_elt V, 0) -> V, top bits are undefined.
2659 if (OpOpcode == ISD::EXTRACT_VECTOR_ELT &&
2660 isa<ConstantSDNode>(Operand.getOperand(1)) &&
2661 Operand.getConstantOperandVal(1) == 0 &&
2662 Operand.getOperand(0).getValueType() == VT)
2663 return Operand.getOperand(0);
2666 // -(X-Y) -> (Y-X) is unsafe because when X==Y, -0.0 != +0.0
2667 if (getTarget().Options.UnsafeFPMath && OpOpcode == ISD::FSUB)
2668 return getNode(ISD::FSUB, DL, VT, Operand.getNode()->getOperand(1),
2669 Operand.getNode()->getOperand(0));
2670 if (OpOpcode == ISD::FNEG) // --X -> X
2671 return Operand.getNode()->getOperand(0);
2674 if (OpOpcode == ISD::FNEG) // abs(-X) -> abs(X)
2675 return getNode(ISD::FABS, DL, VT, Operand.getNode()->getOperand(0));
2680 SDVTList VTs = getVTList(VT);
2681 if (VT != MVT::Glue) { // Don't CSE flag producing nodes
2682 FoldingSetNodeID ID;
2683 SDValue Ops[1] = { Operand };
2684 AddNodeIDNode(ID, Opcode, VTs, Ops, 1);
2686 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
2687 return SDValue(E, 0);
2689 N = new (NodeAllocator) UnarySDNode(Opcode, DL, VTs, Operand);
2690 CSEMap.InsertNode(N, IP);
2692 N = new (NodeAllocator) UnarySDNode(Opcode, DL, VTs, Operand);
2695 AllNodes.push_back(N);
2699 return SDValue(N, 0);
2702 SDValue SelectionDAG::FoldConstantArithmetic(unsigned Opcode,
2704 ConstantSDNode *Cst1,
2705 ConstantSDNode *Cst2) {
2706 const APInt &C1 = Cst1->getAPIntValue(), &C2 = Cst2->getAPIntValue();
2709 case ISD::ADD: return getConstant(C1 + C2, VT);
2710 case ISD::SUB: return getConstant(C1 - C2, VT);
2711 case ISD::MUL: return getConstant(C1 * C2, VT);
2713 if (C2.getBoolValue()) return getConstant(C1.udiv(C2), VT);
2716 if (C2.getBoolValue()) return getConstant(C1.urem(C2), VT);
2719 if (C2.getBoolValue()) return getConstant(C1.sdiv(C2), VT);
2722 if (C2.getBoolValue()) return getConstant(C1.srem(C2), VT);
2724 case ISD::AND: return getConstant(C1 & C2, VT);
2725 case ISD::OR: return getConstant(C1 | C2, VT);
2726 case ISD::XOR: return getConstant(C1 ^ C2, VT);
2727 case ISD::SHL: return getConstant(C1 << C2, VT);
2728 case ISD::SRL: return getConstant(C1.lshr(C2), VT);
2729 case ISD::SRA: return getConstant(C1.ashr(C2), VT);
2730 case ISD::ROTL: return getConstant(C1.rotl(C2), VT);
2731 case ISD::ROTR: return getConstant(C1.rotr(C2), VT);
2738 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT,
2739 SDValue N1, SDValue N2) {
2740 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.getNode());
2741 ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N2.getNode());
2744 case ISD::TokenFactor:
2745 assert(VT == MVT::Other && N1.getValueType() == MVT::Other &&
2746 N2.getValueType() == MVT::Other && "Invalid token factor!");
2747 // Fold trivial token factors.
2748 if (N1.getOpcode() == ISD::EntryToken) return N2;
2749 if (N2.getOpcode() == ISD::EntryToken) return N1;
2750 if (N1 == N2) return N1;
2752 case ISD::CONCAT_VECTORS:
2753 // Concat of UNDEFs is UNDEF.
2754 if (N1.getOpcode() == ISD::UNDEF &&
2755 N2.getOpcode() == ISD::UNDEF)
2756 return getUNDEF(VT);
2758 // A CONCAT_VECTOR with all operands BUILD_VECTOR can be simplified to
2759 // one big BUILD_VECTOR.
2760 if (N1.getOpcode() == ISD::BUILD_VECTOR &&
2761 N2.getOpcode() == ISD::BUILD_VECTOR) {
2762 SmallVector<SDValue, 16> Elts(N1.getNode()->op_begin(),
2763 N1.getNode()->op_end());
2764 Elts.append(N2.getNode()->op_begin(), N2.getNode()->op_end());
2765 return getNode(ISD::BUILD_VECTOR, DL, VT, &Elts[0], Elts.size());
2769 assert(VT.isInteger() && "This operator does not apply to FP types!");
2770 assert(N1.getValueType() == N2.getValueType() &&
2771 N1.getValueType() == VT && "Binary operator types must match!");
2772 // (X & 0) -> 0. This commonly occurs when legalizing i64 values, so it's
2773 // worth handling here.
2774 if (N2C && N2C->isNullValue())
2776 if (N2C && N2C->isAllOnesValue()) // X & -1 -> X
2783 assert(VT.isInteger() && "This operator does not apply to FP types!");
2784 assert(N1.getValueType() == N2.getValueType() &&
2785 N1.getValueType() == VT && "Binary operator types must match!");
2786 // (X ^|+- 0) -> X. This commonly occurs when legalizing i64 values, so
2787 // it's worth handling here.
2788 if (N2C && N2C->isNullValue())
2798 assert(VT.isInteger() && "This operator does not apply to FP types!");
2799 assert(N1.getValueType() == N2.getValueType() &&
2800 N1.getValueType() == VT && "Binary operator types must match!");
2807 if (getTarget().Options.UnsafeFPMath) {
2808 if (Opcode == ISD::FADD) {
2810 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(N1))
2811 if (CFP->getValueAPF().isZero())
2814 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(N2))
2815 if (CFP->getValueAPF().isZero())
2817 } else if (Opcode == ISD::FSUB) {
2819 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(N2))
2820 if (CFP->getValueAPF().isZero())
2822 } else if (Opcode == ISD::FMUL) {
2823 ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(N1);
2826 // If the first operand isn't the constant, try the second
2828 CFP = dyn_cast<ConstantFPSDNode>(N2);
2835 return SDValue(CFP,0);
2837 if (CFP->isExactlyValue(1.0))
2842 assert(VT.isFloatingPoint() && "This operator only applies to FP types!");
2843 assert(N1.getValueType() == N2.getValueType() &&
2844 N1.getValueType() == VT && "Binary operator types must match!");
2846 case ISD::FCOPYSIGN: // N1 and result must match. N1/N2 need not match.
2847 assert(N1.getValueType() == VT &&
2848 N1.getValueType().isFloatingPoint() &&
2849 N2.getValueType().isFloatingPoint() &&
2850 "Invalid FCOPYSIGN!");
2857 assert(VT == N1.getValueType() &&
2858 "Shift operators return type must be the same as their first arg");
2859 assert(VT.isInteger() && N2.getValueType().isInteger() &&
2860 "Shifts only work on integers");
2861 // Verify that the shift amount VT is bit enough to hold valid shift
2862 // amounts. This catches things like trying to shift an i1024 value by an
2863 // i8, which is easy to fall into in generic code that uses
2864 // TLI.getShiftAmount().
2865 assert(N2.getValueType().getSizeInBits() >=
2866 Log2_32_Ceil(N1.getValueType().getSizeInBits()) &&
2867 "Invalid use of small shift amount with oversized value!");
2869 // Always fold shifts of i1 values so the code generator doesn't need to
2870 // handle them. Since we know the size of the shift has to be less than the
2871 // size of the value, the shift/rotate count is guaranteed to be zero.
2874 if (N2C && N2C->isNullValue())
2877 case ISD::FP_ROUND_INREG: {
2878 EVT EVT = cast<VTSDNode>(N2)->getVT();
2879 assert(VT == N1.getValueType() && "Not an inreg round!");
2880 assert(VT.isFloatingPoint() && EVT.isFloatingPoint() &&
2881 "Cannot FP_ROUND_INREG integer types");
2882 assert(EVT.isVector() == VT.isVector() &&
2883 "FP_ROUND_INREG type should be vector iff the operand "
2885 assert((!EVT.isVector() ||
2886 EVT.getVectorNumElements() == VT.getVectorNumElements()) &&
2887 "Vector element counts must match in FP_ROUND_INREG");
2888 assert(EVT.bitsLE(VT) && "Not rounding down!");
2890 if (cast<VTSDNode>(N2)->getVT() == VT) return N1; // Not actually rounding.
2894 assert(VT.isFloatingPoint() &&
2895 N1.getValueType().isFloatingPoint() &&
2896 VT.bitsLE(N1.getValueType()) &&
2897 isa<ConstantSDNode>(N2) && "Invalid FP_ROUND!");
2898 if (N1.getValueType() == VT) return N1; // noop conversion.
2900 case ISD::AssertSext:
2901 case ISD::AssertZext: {
2902 EVT EVT = cast<VTSDNode>(N2)->getVT();
2903 assert(VT == N1.getValueType() && "Not an inreg extend!");
2904 assert(VT.isInteger() && EVT.isInteger() &&
2905 "Cannot *_EXTEND_INREG FP types");
2906 assert(!EVT.isVector() &&
2907 "AssertSExt/AssertZExt type should be the vector element type "
2908 "rather than the vector type!");
2909 assert(EVT.bitsLE(VT) && "Not extending!");
2910 if (VT == EVT) return N1; // noop assertion.
2913 case ISD::SIGN_EXTEND_INREG: {
2914 EVT EVT = cast<VTSDNode>(N2)->getVT();
2915 assert(VT == N1.getValueType() && "Not an inreg extend!");
2916 assert(VT.isInteger() && EVT.isInteger() &&
2917 "Cannot *_EXTEND_INREG FP types");
2918 assert(EVT.isVector() == VT.isVector() &&
2919 "SIGN_EXTEND_INREG type should be vector iff the operand "
2921 assert((!EVT.isVector() ||
2922 EVT.getVectorNumElements() == VT.getVectorNumElements()) &&
2923 "Vector element counts must match in SIGN_EXTEND_INREG");
2924 assert(EVT.bitsLE(VT) && "Not extending!");
2925 if (EVT == VT) return N1; // Not actually extending
2928 APInt Val = N1C->getAPIntValue();
2929 unsigned FromBits = EVT.getScalarType().getSizeInBits();
2930 Val <<= Val.getBitWidth()-FromBits;
2931 Val = Val.ashr(Val.getBitWidth()-FromBits);
2932 return getConstant(Val, VT);
2936 case ISD::EXTRACT_VECTOR_ELT:
2937 // EXTRACT_VECTOR_ELT of an UNDEF is an UNDEF.
2938 if (N1.getOpcode() == ISD::UNDEF)
2939 return getUNDEF(VT);
2941 // EXTRACT_VECTOR_ELT of CONCAT_VECTORS is often formed while lowering is
2942 // expanding copies of large vectors from registers.
2944 N1.getOpcode() == ISD::CONCAT_VECTORS &&
2945 N1.getNumOperands() > 0) {
2947 N1.getOperand(0).getValueType().getVectorNumElements();
2948 return getNode(ISD::EXTRACT_VECTOR_ELT, DL, VT,
2949 N1.getOperand(N2C->getZExtValue() / Factor),
2950 getConstant(N2C->getZExtValue() % Factor,
2951 N2.getValueType()));
2954 // EXTRACT_VECTOR_ELT of BUILD_VECTOR is often formed while lowering is
2955 // expanding large vector constants.
2956 if (N2C && N1.getOpcode() == ISD::BUILD_VECTOR) {
2957 SDValue Elt = N1.getOperand(N2C->getZExtValue());
2959 if (VT != Elt.getValueType())
2960 // If the vector element type is not legal, the BUILD_VECTOR operands
2961 // are promoted and implicitly truncated, and the result implicitly
2962 // extended. Make that explicit here.
2963 Elt = getAnyExtOrTrunc(Elt, DL, VT);
2968 // EXTRACT_VECTOR_ELT of INSERT_VECTOR_ELT is often formed when vector
2969 // operations are lowered to scalars.
2970 if (N1.getOpcode() == ISD::INSERT_VECTOR_ELT) {
2971 // If the indices are the same, return the inserted element else
2972 // if the indices are known different, extract the element from
2973 // the original vector.
2974 SDValue N1Op2 = N1.getOperand(2);
2975 ConstantSDNode *N1Op2C = dyn_cast<ConstantSDNode>(N1Op2.getNode());
2977 if (N1Op2C && N2C) {
2978 if (N1Op2C->getZExtValue() == N2C->getZExtValue()) {
2979 if (VT == N1.getOperand(1).getValueType())
2980 return N1.getOperand(1);
2982 return getSExtOrTrunc(N1.getOperand(1), DL, VT);
2985 return getNode(ISD::EXTRACT_VECTOR_ELT, DL, VT, N1.getOperand(0), N2);
2989 case ISD::EXTRACT_ELEMENT:
2990 assert(N2C && (unsigned)N2C->getZExtValue() < 2 && "Bad EXTRACT_ELEMENT!");
2991 assert(!N1.getValueType().isVector() && !VT.isVector() &&
2992 (N1.getValueType().isInteger() == VT.isInteger()) &&
2993 N1.getValueType() != VT &&
2994 "Wrong types for EXTRACT_ELEMENT!");
2996 // EXTRACT_ELEMENT of BUILD_PAIR is often formed while legalize is expanding
2997 // 64-bit integers into 32-bit parts. Instead of building the extract of
2998 // the BUILD_PAIR, only to have legalize rip it apart, just do it now.
2999 if (N1.getOpcode() == ISD::BUILD_PAIR)
3000 return N1.getOperand(N2C->getZExtValue());
3002 // EXTRACT_ELEMENT of a constant int is also very common.
3003 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N1)) {
3004 unsigned ElementSize = VT.getSizeInBits();
3005 unsigned Shift = ElementSize * N2C->getZExtValue();
3006 APInt ShiftedVal = C->getAPIntValue().lshr(Shift);
3007 return getConstant(ShiftedVal.trunc(ElementSize), VT);
3010 case ISD::EXTRACT_SUBVECTOR: {
3012 if (VT.isSimple() && N1.getValueType().isSimple()) {
3013 assert(VT.isVector() && N1.getValueType().isVector() &&
3014 "Extract subvector VTs must be a vectors!");
3015 assert(VT.getVectorElementType() == N1.getValueType().getVectorElementType() &&
3016 "Extract subvector VTs must have the same element type!");
3017 assert(VT.getSimpleVT() <= N1.getValueType().getSimpleVT() &&
3018 "Extract subvector must be from larger vector to smaller vector!");
3020 if (isa<ConstantSDNode>(Index.getNode())) {
3021 assert((VT.getVectorNumElements() +
3022 cast<ConstantSDNode>(Index.getNode())->getZExtValue()
3023 <= N1.getValueType().getVectorNumElements())
3024 && "Extract subvector overflow!");
3027 // Trivial extraction.
3028 if (VT.getSimpleVT() == N1.getValueType().getSimpleVT())
3037 SDValue SV = FoldConstantArithmetic(Opcode, VT, N1C, N2C);
3038 if (SV.getNode()) return SV;
3039 } else { // Cannonicalize constant to RHS if commutative
3040 if (isCommutativeBinOp(Opcode)) {
3041 std::swap(N1C, N2C);
3047 // Constant fold FP operations.
3048 ConstantFPSDNode *N1CFP = dyn_cast<ConstantFPSDNode>(N1.getNode());
3049 ConstantFPSDNode *N2CFP = dyn_cast<ConstantFPSDNode>(N2.getNode());
3051 if (!N2CFP && isCommutativeBinOp(Opcode)) {
3052 // Cannonicalize constant to RHS if commutative
3053 std::swap(N1CFP, N2CFP);
3055 } else if (N2CFP && VT != MVT::ppcf128) {
3056 APFloat V1 = N1CFP->getValueAPF(), V2 = N2CFP->getValueAPF();
3057 APFloat::opStatus s;
3060 s = V1.add(V2, APFloat::rmNearestTiesToEven);
3061 if (s != APFloat::opInvalidOp)
3062 return getConstantFP(V1, VT);
3065 s = V1.subtract(V2, APFloat::rmNearestTiesToEven);
3066 if (s!=APFloat::opInvalidOp)
3067 return getConstantFP(V1, VT);
3070 s = V1.multiply(V2, APFloat::rmNearestTiesToEven);
3071 if (s!=APFloat::opInvalidOp)
3072 return getConstantFP(V1, VT);
3075 s = V1.divide(V2, APFloat::rmNearestTiesToEven);
3076 if (s!=APFloat::opInvalidOp && s!=APFloat::opDivByZero)
3077 return getConstantFP(V1, VT);
3080 s = V1.mod(V2, APFloat::rmNearestTiesToEven);
3081 if (s!=APFloat::opInvalidOp && s!=APFloat::opDivByZero)
3082 return getConstantFP(V1, VT);
3084 case ISD::FCOPYSIGN:
3086 return getConstantFP(V1, VT);
3091 if (Opcode == ISD::FP_ROUND) {
3092 APFloat V = N1CFP->getValueAPF(); // make copy
3094 // This can return overflow, underflow, or inexact; we don't care.
3095 // FIXME need to be more flexible about rounding mode.
3096 (void)V.convert(*EVTToAPFloatSemantics(VT),
3097 APFloat::rmNearestTiesToEven, &ignored);
3098 return getConstantFP(V, VT);
3102 // Canonicalize an UNDEF to the RHS, even over a constant.
3103 if (N1.getOpcode() == ISD::UNDEF) {
3104 if (isCommutativeBinOp(Opcode)) {
3108 case ISD::FP_ROUND_INREG:
3109 case ISD::SIGN_EXTEND_INREG:
3115 return N1; // fold op(undef, arg2) -> undef
3123 return getConstant(0, VT); // fold op(undef, arg2) -> 0
3124 // For vectors, we can't easily build an all zero vector, just return
3131 // Fold a bunch of operators when the RHS is undef.
3132 if (N2.getOpcode() == ISD::UNDEF) {
3135 if (N1.getOpcode() == ISD::UNDEF)
3136 // Handle undef ^ undef -> 0 special case. This is a common
3138 return getConstant(0, VT);
3148 return N2; // fold op(arg1, undef) -> undef
3154 if (getTarget().Options.UnsafeFPMath)
3162 return getConstant(0, VT); // fold op(arg1, undef) -> 0
3163 // For vectors, we can't easily build an all zero vector, just return
3168 return getConstant(APInt::getAllOnesValue(VT.getSizeInBits()), VT);
3169 // For vectors, we can't easily build an all one vector, just return
3177 // Memoize this node if possible.
3179 SDVTList VTs = getVTList(VT);
3180 if (VT != MVT::Glue) {
3181 SDValue Ops[] = { N1, N2 };
3182 FoldingSetNodeID ID;
3183 AddNodeIDNode(ID, Opcode, VTs, Ops, 2);
3185 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
3186 return SDValue(E, 0);
3188 N = new (NodeAllocator) BinarySDNode(Opcode, DL, VTs, N1, N2);
3189 CSEMap.InsertNode(N, IP);
3191 N = new (NodeAllocator) BinarySDNode(Opcode, DL, VTs, N1, N2);
3194 AllNodes.push_back(N);
3198 return SDValue(N, 0);
3201 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT,
3202 SDValue N1, SDValue N2, SDValue N3) {
3203 // Perform various simplifications.
3204 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.getNode());
3206 case ISD::CONCAT_VECTORS:
3207 // A CONCAT_VECTOR with all operands BUILD_VECTOR can be simplified to
3208 // one big BUILD_VECTOR.
3209 if (N1.getOpcode() == ISD::BUILD_VECTOR &&
3210 N2.getOpcode() == ISD::BUILD_VECTOR &&
3211 N3.getOpcode() == ISD::BUILD_VECTOR) {
3212 SmallVector<SDValue, 16> Elts(N1.getNode()->op_begin(),
3213 N1.getNode()->op_end());
3214 Elts.append(N2.getNode()->op_begin(), N2.getNode()->op_end());
3215 Elts.append(N3.getNode()->op_begin(), N3.getNode()->op_end());
3216 return getNode(ISD::BUILD_VECTOR, DL, VT, &Elts[0], Elts.size());
3220 // Use FoldSetCC to simplify SETCC's.
3221 SDValue Simp = FoldSetCC(VT, N1, N2, cast<CondCodeSDNode>(N3)->get(), DL);
3222 if (Simp.getNode()) return Simp;
3227 if (N1C->getZExtValue())
3228 return N2; // select true, X, Y -> X
3229 return N3; // select false, X, Y -> Y
3232 if (N2 == N3) return N2; // select C, X, X -> X
3234 case ISD::VECTOR_SHUFFLE:
3235 llvm_unreachable("should use getVectorShuffle constructor!");
3236 case ISD::INSERT_SUBVECTOR: {
3238 if (VT.isSimple() && N1.getValueType().isSimple()
3239 && N2.getValueType().isSimple()) {
3240 assert(VT.isVector() && N1.getValueType().isVector() &&
3241 N2.getValueType().isVector() &&
3242 "Insert subvector VTs must be a vectors");
3243 assert(VT == N1.getValueType() &&
3244 "Dest and insert subvector source types must match!");
3245 assert(N2.getValueType().getSimpleVT() <= N1.getValueType().getSimpleVT() &&
3246 "Insert subvector must be from smaller vector to larger vector!");
3247 if (isa<ConstantSDNode>(Index.getNode())) {
3248 assert((N2.getValueType().getVectorNumElements() +
3249 cast<ConstantSDNode>(Index.getNode())->getZExtValue()
3250 <= VT.getVectorNumElements())
3251 && "Insert subvector overflow!");
3254 // Trivial insertion.
3255 if (VT.getSimpleVT() == N2.getValueType().getSimpleVT())
3261 // Fold bit_convert nodes from a type to themselves.
3262 if (N1.getValueType() == VT)
3267 // Memoize node if it doesn't produce a flag.
3269 SDVTList VTs = getVTList(VT);
3270 if (VT != MVT::Glue) {
3271 SDValue Ops[] = { N1, N2, N3 };
3272 FoldingSetNodeID ID;
3273 AddNodeIDNode(ID, Opcode, VTs, Ops, 3);
3275 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
3276 return SDValue(E, 0);
3278 N = new (NodeAllocator) TernarySDNode(Opcode, DL, VTs, N1, N2, N3);
3279 CSEMap.InsertNode(N, IP);
3281 N = new (NodeAllocator) TernarySDNode(Opcode, DL, VTs, N1, N2, N3);
3284 AllNodes.push_back(N);
3288 return SDValue(N, 0);
3291 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT,
3292 SDValue N1, SDValue N2, SDValue N3,
3294 SDValue Ops[] = { N1, N2, N3, N4 };
3295 return getNode(Opcode, DL, VT, Ops, 4);
3298 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT,
3299 SDValue N1, SDValue N2, SDValue N3,
3300 SDValue N4, SDValue N5) {
3301 SDValue Ops[] = { N1, N2, N3, N4, N5 };
3302 return getNode(Opcode, DL, VT, Ops, 5);
3305 /// getStackArgumentTokenFactor - Compute a TokenFactor to force all
3306 /// the incoming stack arguments to be loaded from the stack.
3307 SDValue SelectionDAG::getStackArgumentTokenFactor(SDValue Chain) {
3308 SmallVector<SDValue, 8> ArgChains;
3310 // Include the original chain at the beginning of the list. When this is
3311 // used by target LowerCall hooks, this helps legalize find the
3312 // CALLSEQ_BEGIN node.
3313 ArgChains.push_back(Chain);
3315 // Add a chain value for each stack argument.
3316 for (SDNode::use_iterator U = getEntryNode().getNode()->use_begin(),
3317 UE = getEntryNode().getNode()->use_end(); U != UE; ++U)
3318 if (LoadSDNode *L = dyn_cast<LoadSDNode>(*U))
3319 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(L->getBasePtr()))
3320 if (FI->getIndex() < 0)
3321 ArgChains.push_back(SDValue(L, 1));
3323 // Build a tokenfactor for all the chains.
3324 return getNode(ISD::TokenFactor, Chain.getDebugLoc(), MVT::Other,
3325 &ArgChains[0], ArgChains.size());
3328 /// SplatByte - Distribute ByteVal over NumBits bits.
3329 static APInt SplatByte(unsigned NumBits, uint8_t ByteVal) {
3330 APInt Val = APInt(NumBits, ByteVal);
3332 for (unsigned i = NumBits; i > 8; i >>= 1) {
3333 Val = (Val << Shift) | Val;
3339 /// getMemsetValue - Vectorized representation of the memset value
3341 static SDValue getMemsetValue(SDValue Value, EVT VT, SelectionDAG &DAG,
3343 assert(Value.getOpcode() != ISD::UNDEF);
3345 unsigned NumBits = VT.getScalarType().getSizeInBits();
3346 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Value)) {
3347 APInt Val = SplatByte(NumBits, C->getZExtValue() & 255);
3349 return DAG.getConstant(Val, VT);
3350 return DAG.getConstantFP(APFloat(Val), VT);
3353 Value = DAG.getNode(ISD::ZERO_EXTEND, dl, VT, Value);
3355 // Use a multiplication with 0x010101... to extend the input to the
3357 APInt Magic = SplatByte(NumBits, 0x01);
3358 Value = DAG.getNode(ISD::MUL, dl, VT, Value, DAG.getConstant(Magic, VT));
3364 /// getMemsetStringVal - Similar to getMemsetValue. Except this is only
3365 /// used when a memcpy is turned into a memset when the source is a constant
3367 static SDValue getMemsetStringVal(EVT VT, DebugLoc dl, SelectionDAG &DAG,
3368 const TargetLowering &TLI, StringRef Str) {
3369 // Handle vector with all elements zero.
3372 return DAG.getConstant(0, VT);
3373 else if (VT == MVT::f32 || VT == MVT::f64)
3374 return DAG.getConstantFP(0.0, VT);
3375 else if (VT.isVector()) {
3376 unsigned NumElts = VT.getVectorNumElements();
3377 MVT EltVT = (VT.getVectorElementType() == MVT::f32) ? MVT::i32 : MVT::i64;
3378 return DAG.getNode(ISD::BITCAST, dl, VT,
3379 DAG.getConstant(0, EVT::getVectorVT(*DAG.getContext(),
3382 llvm_unreachable("Expected type!");
3385 assert(!VT.isVector() && "Can't handle vector type here!");
3386 unsigned NumVTBytes = VT.getSizeInBits() / 8;
3387 unsigned NumBytes = std::min(NumVTBytes, unsigned(Str.size()));
3390 if (TLI.isLittleEndian()) {
3391 for (unsigned i = 0; i != NumBytes; ++i)
3392 Val |= (uint64_t)(unsigned char)Str[i] << i*8;
3394 for (unsigned i = 0; i != NumBytes; ++i)
3395 Val |= (uint64_t)(unsigned char)Str[i] << (NumVTBytes-i-1)*8;
3398 return DAG.getConstant(Val, VT);
3401 /// getMemBasePlusOffset - Returns base and offset node for the
3403 static SDValue getMemBasePlusOffset(SDValue Base, unsigned Offset,
3404 SelectionDAG &DAG) {
3405 EVT VT = Base.getValueType();
3406 return DAG.getNode(ISD::ADD, Base.getDebugLoc(),
3407 VT, Base, DAG.getConstant(Offset, VT));
3410 /// isMemSrcFromString - Returns true if memcpy source is a string constant.
3412 static bool isMemSrcFromString(SDValue Src, StringRef &Str) {
3413 unsigned SrcDelta = 0;
3414 GlobalAddressSDNode *G = NULL;
3415 if (Src.getOpcode() == ISD::GlobalAddress)
3416 G = cast<GlobalAddressSDNode>(Src);
3417 else if (Src.getOpcode() == ISD::ADD &&
3418 Src.getOperand(0).getOpcode() == ISD::GlobalAddress &&
3419 Src.getOperand(1).getOpcode() == ISD::Constant) {
3420 G = cast<GlobalAddressSDNode>(Src.getOperand(0));
3421 SrcDelta = cast<ConstantSDNode>(Src.getOperand(1))->getZExtValue();
3426 return getConstantStringInfo(G->getGlobal(), Str, SrcDelta, false);
3429 /// FindOptimalMemOpLowering - Determines the optimial series memory ops
3430 /// to replace the memset / memcpy. Return true if the number of memory ops
3431 /// is below the threshold. It returns the types of the sequence of
3432 /// memory ops to perform memset / memcpy by reference.
3433 static bool FindOptimalMemOpLowering(std::vector<EVT> &MemOps,
3434 unsigned Limit, uint64_t Size,
3435 unsigned DstAlign, unsigned SrcAlign,
3439 const TargetLowering &TLI) {
3440 assert((SrcAlign == 0 || SrcAlign >= DstAlign) &&
3441 "Expecting memcpy / memset source to meet alignment requirement!");
3442 // If 'SrcAlign' is zero, that means the memory operation does not need to
3443 // load the value, i.e. memset or memcpy from constant string. Otherwise,
3444 // it's the inferred alignment of the source. 'DstAlign', on the other hand,
3445 // is the specified alignment of the memory operation. If it is zero, that
3446 // means it's possible to change the alignment of the destination.
3447 // 'MemcpyStrSrc' indicates whether the memcpy source is constant so it does
3448 // not need to be loaded.
3449 EVT VT = TLI.getOptimalMemOpType(Size, DstAlign, SrcAlign,
3450 IsZeroVal, MemcpyStrSrc,
3451 DAG.getMachineFunction());
3453 if (VT == MVT::Other) {
3454 if (DstAlign >= TLI.getDataLayout()->getPointerPrefAlignment() ||
3455 TLI.allowsUnalignedMemoryAccesses(VT)) {
3456 VT = TLI.getPointerTy();
3458 switch (DstAlign & 7) {
3459 case 0: VT = MVT::i64; break;
3460 case 4: VT = MVT::i32; break;
3461 case 2: VT = MVT::i16; break;
3462 default: VT = MVT::i8; break;
3467 while (!TLI.isTypeLegal(LVT))
3468 LVT = (MVT::SimpleValueType)(LVT.SimpleTy - 1);
3469 assert(LVT.isInteger());
3475 unsigned NumMemOps = 0;
3477 unsigned VTSize = VT.getSizeInBits() / 8;
3478 while (VTSize > Size) {
3479 // For now, only use non-vector load / store's for the left-over pieces.
3480 if (VT.isVector() || VT.isFloatingPoint()) {
3482 while (!TLI.isTypeLegal(VT))
3483 VT = (MVT::SimpleValueType)(VT.getSimpleVT().SimpleTy - 1);
3484 VTSize = VT.getSizeInBits() / 8;
3486 // This can result in a type that is not legal on the target, e.g.
3487 // 1 or 2 bytes on PPC.
3488 VT = (MVT::SimpleValueType)(VT.getSimpleVT().SimpleTy - 1);
3493 if (++NumMemOps > Limit)
3495 MemOps.push_back(VT);
3502 static SDValue getMemcpyLoadsAndStores(SelectionDAG &DAG, DebugLoc dl,
3503 SDValue Chain, SDValue Dst,
3504 SDValue Src, uint64_t Size,
3505 unsigned Align, bool isVol,
3507 MachinePointerInfo DstPtrInfo,
3508 MachinePointerInfo SrcPtrInfo) {
3509 // Turn a memcpy of undef to nop.
3510 if (Src.getOpcode() == ISD::UNDEF)
3513 // Expand memcpy to a series of load and store ops if the size operand falls
3514 // below a certain threshold.
3515 // TODO: In the AlwaysInline case, if the size is big then generate a loop
3516 // rather than maybe a humongous number of loads and stores.
3517 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
3518 std::vector<EVT> MemOps;
3519 bool DstAlignCanChange = false;
3520 MachineFunction &MF = DAG.getMachineFunction();
3521 MachineFrameInfo *MFI = MF.getFrameInfo();
3523 MF.getFunction()->getFnAttributes().
3524 hasAttribute(Attributes::OptimizeForSize);
3525 FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Dst);
3526 if (FI && !MFI->isFixedObjectIndex(FI->getIndex()))
3527 DstAlignCanChange = true;
3528 unsigned SrcAlign = DAG.InferPtrAlignment(Src);
3529 if (Align > SrcAlign)
3532 bool CopyFromStr = isMemSrcFromString(Src, Str);
3533 bool isZeroStr = CopyFromStr && Str.empty();
3534 unsigned Limit = AlwaysInline ? ~0U : TLI.getMaxStoresPerMemcpy(OptSize);
3536 if (!FindOptimalMemOpLowering(MemOps, Limit, Size,
3537 (DstAlignCanChange ? 0 : Align),
3538 (isZeroStr ? 0 : SrcAlign),
3539 true, CopyFromStr, DAG, TLI))
3542 if (DstAlignCanChange) {
3543 Type *Ty = MemOps[0].getTypeForEVT(*DAG.getContext());
3544 unsigned NewAlign = (unsigned) TLI.getDataLayout()->getABITypeAlignment(Ty);
3545 if (NewAlign > Align) {
3546 // Give the stack frame object a larger alignment if needed.
3547 if (MFI->getObjectAlignment(FI->getIndex()) < NewAlign)
3548 MFI->setObjectAlignment(FI->getIndex(), NewAlign);
3553 SmallVector<SDValue, 8> OutChains;
3554 unsigned NumMemOps = MemOps.size();
3555 uint64_t SrcOff = 0, DstOff = 0;
3556 for (unsigned i = 0; i != NumMemOps; ++i) {
3558 unsigned VTSize = VT.getSizeInBits() / 8;
3559 SDValue Value, Store;
3562 (isZeroStr || (VT.isInteger() && !VT.isVector()))) {
3563 // It's unlikely a store of a vector immediate can be done in a single
3564 // instruction. It would require a load from a constantpool first.
3565 // We only handle zero vectors here.
3566 // FIXME: Handle other cases where store of vector immediate is done in
3567 // a single instruction.
3568 Value = getMemsetStringVal(VT, dl, DAG, TLI, Str.substr(SrcOff));
3569 Store = DAG.getStore(Chain, dl, Value,
3570 getMemBasePlusOffset(Dst, DstOff, DAG),
3571 DstPtrInfo.getWithOffset(DstOff), isVol,
3574 // The type might not be legal for the target. This should only happen
3575 // if the type is smaller than a legal type, as on PPC, so the right
3576 // thing to do is generate a LoadExt/StoreTrunc pair. These simplify
3577 // to Load/Store if NVT==VT.
3578 // FIXME does the case above also need this?
3579 EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), VT);
3580 assert(NVT.bitsGE(VT));
3581 Value = DAG.getExtLoad(ISD::EXTLOAD, dl, NVT, Chain,
3582 getMemBasePlusOffset(Src, SrcOff, DAG),
3583 SrcPtrInfo.getWithOffset(SrcOff), VT, isVol, false,
3584 MinAlign(SrcAlign, SrcOff));
3585 Store = DAG.getTruncStore(Chain, dl, Value,
3586 getMemBasePlusOffset(Dst, DstOff, DAG),
3587 DstPtrInfo.getWithOffset(DstOff), VT, isVol,
3590 OutChains.push_back(Store);
3595 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
3596 &OutChains[0], OutChains.size());
3599 static SDValue getMemmoveLoadsAndStores(SelectionDAG &DAG, DebugLoc dl,
3600 SDValue Chain, SDValue Dst,
3601 SDValue Src, uint64_t Size,
3602 unsigned Align, bool isVol,
3604 MachinePointerInfo DstPtrInfo,
3605 MachinePointerInfo SrcPtrInfo) {
3606 // Turn a memmove of undef to nop.
3607 if (Src.getOpcode() == ISD::UNDEF)
3610 // Expand memmove to a series of load and store ops if the size operand falls
3611 // below a certain threshold.
3612 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
3613 std::vector<EVT> MemOps;
3614 bool DstAlignCanChange = false;
3615 MachineFunction &MF = DAG.getMachineFunction();
3616 MachineFrameInfo *MFI = MF.getFrameInfo();
3617 bool OptSize = MF.getFunction()->getFnAttributes().
3618 hasAttribute(Attributes::OptimizeForSize);
3619 FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Dst);
3620 if (FI && !MFI->isFixedObjectIndex(FI->getIndex()))
3621 DstAlignCanChange = true;
3622 unsigned SrcAlign = DAG.InferPtrAlignment(Src);
3623 if (Align > SrcAlign)
3625 unsigned Limit = AlwaysInline ? ~0U : TLI.getMaxStoresPerMemmove(OptSize);
3627 if (!FindOptimalMemOpLowering(MemOps, Limit, Size,
3628 (DstAlignCanChange ? 0 : Align),
3629 SrcAlign, true, false, DAG, TLI))
3632 if (DstAlignCanChange) {
3633 Type *Ty = MemOps[0].getTypeForEVT(*DAG.getContext());
3634 unsigned NewAlign = (unsigned) TLI.getDataLayout()->getABITypeAlignment(Ty);
3635 if (NewAlign > Align) {
3636 // Give the stack frame object a larger alignment if needed.
3637 if (MFI->getObjectAlignment(FI->getIndex()) < NewAlign)
3638 MFI->setObjectAlignment(FI->getIndex(), NewAlign);
3643 uint64_t SrcOff = 0, DstOff = 0;
3644 SmallVector<SDValue, 8> LoadValues;
3645 SmallVector<SDValue, 8> LoadChains;
3646 SmallVector<SDValue, 8> OutChains;
3647 unsigned NumMemOps = MemOps.size();
3648 for (unsigned i = 0; i < NumMemOps; i++) {
3650 unsigned VTSize = VT.getSizeInBits() / 8;
3651 SDValue Value, Store;
3653 Value = DAG.getLoad(VT, dl, Chain,
3654 getMemBasePlusOffset(Src, SrcOff, DAG),
3655 SrcPtrInfo.getWithOffset(SrcOff), isVol,
3656 false, false, SrcAlign);
3657 LoadValues.push_back(Value);
3658 LoadChains.push_back(Value.getValue(1));
3661 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
3662 &LoadChains[0], LoadChains.size());
3664 for (unsigned i = 0; i < NumMemOps; i++) {
3666 unsigned VTSize = VT.getSizeInBits() / 8;
3667 SDValue Value, Store;
3669 Store = DAG.getStore(Chain, dl, LoadValues[i],
3670 getMemBasePlusOffset(Dst, DstOff, DAG),
3671 DstPtrInfo.getWithOffset(DstOff), isVol, false, Align);
3672 OutChains.push_back(Store);
3676 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
3677 &OutChains[0], OutChains.size());
3680 static SDValue getMemsetStores(SelectionDAG &DAG, DebugLoc dl,
3681 SDValue Chain, SDValue Dst,
3682 SDValue Src, uint64_t Size,
3683 unsigned Align, bool isVol,
3684 MachinePointerInfo DstPtrInfo) {
3685 // Turn a memset of undef to nop.
3686 if (Src.getOpcode() == ISD::UNDEF)
3689 // Expand memset to a series of load/store ops if the size operand
3690 // falls below a certain threshold.
3691 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
3692 std::vector<EVT> MemOps;
3693 bool DstAlignCanChange = false;
3694 MachineFunction &MF = DAG.getMachineFunction();
3695 MachineFrameInfo *MFI = MF.getFrameInfo();
3696 bool OptSize = MF.getFunction()->getFnAttributes().
3697 hasAttribute(Attributes::OptimizeForSize);
3698 FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Dst);
3699 if (FI && !MFI->isFixedObjectIndex(FI->getIndex()))
3700 DstAlignCanChange = true;
3702 isa<ConstantSDNode>(Src) && cast<ConstantSDNode>(Src)->isNullValue();
3703 if (!FindOptimalMemOpLowering(MemOps, TLI.getMaxStoresPerMemset(OptSize),
3704 Size, (DstAlignCanChange ? 0 : Align), 0,
3705 IsZeroVal, false, DAG, TLI))
3708 if (DstAlignCanChange) {
3709 Type *Ty = MemOps[0].getTypeForEVT(*DAG.getContext());
3710 unsigned NewAlign = (unsigned) TLI.getDataLayout()->getABITypeAlignment(Ty);
3711 if (NewAlign > Align) {
3712 // Give the stack frame object a larger alignment if needed.
3713 if (MFI->getObjectAlignment(FI->getIndex()) < NewAlign)
3714 MFI->setObjectAlignment(FI->getIndex(), NewAlign);
3719 SmallVector<SDValue, 8> OutChains;
3720 uint64_t DstOff = 0;
3721 unsigned NumMemOps = MemOps.size();
3723 // Find the largest store and generate the bit pattern for it.
3724 EVT LargestVT = MemOps[0];
3725 for (unsigned i = 1; i < NumMemOps; i++)
3726 if (MemOps[i].bitsGT(LargestVT))
3727 LargestVT = MemOps[i];
3728 SDValue MemSetValue = getMemsetValue(Src, LargestVT, DAG, dl);
3730 for (unsigned i = 0; i < NumMemOps; i++) {
3733 // If this store is smaller than the largest store see whether we can get
3734 // the smaller value for free with a truncate.
3735 SDValue Value = MemSetValue;
3736 if (VT.bitsLT(LargestVT)) {
3737 if (!LargestVT.isVector() && !VT.isVector() &&
3738 TLI.isTruncateFree(LargestVT, VT))
3739 Value = DAG.getNode(ISD::TRUNCATE, dl, VT, MemSetValue);
3741 Value = getMemsetValue(Src, VT, DAG, dl);
3743 assert(Value.getValueType() == VT && "Value with wrong type.");
3744 SDValue Store = DAG.getStore(Chain, dl, Value,
3745 getMemBasePlusOffset(Dst, DstOff, DAG),
3746 DstPtrInfo.getWithOffset(DstOff),
3747 isVol, false, Align);
3748 OutChains.push_back(Store);
3749 DstOff += VT.getSizeInBits() / 8;
3752 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
3753 &OutChains[0], OutChains.size());
3756 SDValue SelectionDAG::getMemcpy(SDValue Chain, DebugLoc dl, SDValue Dst,
3757 SDValue Src, SDValue Size,
3758 unsigned Align, bool isVol, bool AlwaysInline,
3759 MachinePointerInfo DstPtrInfo,
3760 MachinePointerInfo SrcPtrInfo) {
3762 // Check to see if we should lower the memcpy to loads and stores first.
3763 // For cases within the target-specified limits, this is the best choice.
3764 ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size);
3766 // Memcpy with size zero? Just return the original chain.
3767 if (ConstantSize->isNullValue())
3770 SDValue Result = getMemcpyLoadsAndStores(*this, dl, Chain, Dst, Src,
3771 ConstantSize->getZExtValue(),Align,
3772 isVol, false, DstPtrInfo, SrcPtrInfo);
3773 if (Result.getNode())
3777 // Then check to see if we should lower the memcpy with target-specific
3778 // code. If the target chooses to do this, this is the next best.
3780 TSI.EmitTargetCodeForMemcpy(*this, dl, Chain, Dst, Src, Size, Align,
3781 isVol, AlwaysInline,
3782 DstPtrInfo, SrcPtrInfo);
3783 if (Result.getNode())
3786 // If we really need inline code and the target declined to provide it,
3787 // use a (potentially long) sequence of loads and stores.
3789 assert(ConstantSize && "AlwaysInline requires a constant size!");
3790 return getMemcpyLoadsAndStores(*this, dl, Chain, Dst, Src,
3791 ConstantSize->getZExtValue(), Align, isVol,
3792 true, DstPtrInfo, SrcPtrInfo);
3795 // FIXME: If the memcpy is volatile (isVol), lowering it to a plain libc
3796 // memcpy is not guaranteed to be safe. libc memcpys aren't required to
3797 // respect volatile, so they may do things like read or write memory
3798 // beyond the given memory regions. But fixing this isn't easy, and most
3799 // people don't care.
3801 // Emit a library call.
3802 TargetLowering::ArgListTy Args;
3803 TargetLowering::ArgListEntry Entry;
3804 Entry.Ty = TLI.getDataLayout()->getIntPtrType(*getContext());
3805 Entry.Node = Dst; Args.push_back(Entry);
3806 Entry.Node = Src; Args.push_back(Entry);
3807 Entry.Node = Size; Args.push_back(Entry);
3808 // FIXME: pass in DebugLoc
3810 CallLoweringInfo CLI(Chain, Type::getVoidTy(*getContext()),
3811 false, false, false, false, 0,
3812 TLI.getLibcallCallingConv(RTLIB::MEMCPY),
3813 /*isTailCall=*/false,
3814 /*doesNotReturn=*/false, /*isReturnValueUsed=*/false,
3815 getExternalSymbol(TLI.getLibcallName(RTLIB::MEMCPY),
3816 TLI.getPointerTy()),
3818 std::pair<SDValue,SDValue> CallResult = TLI.LowerCallTo(CLI);
3820 return CallResult.second;
3823 SDValue SelectionDAG::getMemmove(SDValue Chain, DebugLoc dl, SDValue Dst,
3824 SDValue Src, SDValue Size,
3825 unsigned Align, bool isVol,
3826 MachinePointerInfo DstPtrInfo,
3827 MachinePointerInfo SrcPtrInfo) {
3829 // Check to see if we should lower the memmove to loads and stores first.
3830 // For cases within the target-specified limits, this is the best choice.
3831 ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size);
3833 // Memmove with size zero? Just return the original chain.
3834 if (ConstantSize->isNullValue())
3838 getMemmoveLoadsAndStores(*this, dl, Chain, Dst, Src,
3839 ConstantSize->getZExtValue(), Align, isVol,
3840 false, DstPtrInfo, SrcPtrInfo);
3841 if (Result.getNode())
3845 // Then check to see if we should lower the memmove with target-specific
3846 // code. If the target chooses to do this, this is the next best.
3848 TSI.EmitTargetCodeForMemmove(*this, dl, Chain, Dst, Src, Size, Align, isVol,
3849 DstPtrInfo, SrcPtrInfo);
3850 if (Result.getNode())
3853 // FIXME: If the memmove is volatile, lowering it to plain libc memmove may
3854 // not be safe. See memcpy above for more details.
3856 // Emit a library call.
3857 TargetLowering::ArgListTy Args;
3858 TargetLowering::ArgListEntry Entry;
3859 Entry.Ty = TLI.getDataLayout()->getIntPtrType(*getContext());
3860 Entry.Node = Dst; Args.push_back(Entry);
3861 Entry.Node = Src; Args.push_back(Entry);
3862 Entry.Node = Size; Args.push_back(Entry);
3863 // FIXME: pass in DebugLoc
3865 CallLoweringInfo CLI(Chain, Type::getVoidTy(*getContext()),
3866 false, false, false, false, 0,
3867 TLI.getLibcallCallingConv(RTLIB::MEMMOVE),
3868 /*isTailCall=*/false,
3869 /*doesNotReturn=*/false, /*isReturnValueUsed=*/false,
3870 getExternalSymbol(TLI.getLibcallName(RTLIB::MEMMOVE),
3871 TLI.getPointerTy()),
3873 std::pair<SDValue,SDValue> CallResult = TLI.LowerCallTo(CLI);
3875 return CallResult.second;
3878 SDValue SelectionDAG::getMemset(SDValue Chain, DebugLoc dl, SDValue Dst,
3879 SDValue Src, SDValue Size,
3880 unsigned Align, bool isVol,
3881 MachinePointerInfo DstPtrInfo) {
3883 // Check to see if we should lower the memset to stores first.
3884 // For cases within the target-specified limits, this is the best choice.
3885 ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size);
3887 // Memset with size zero? Just return the original chain.
3888 if (ConstantSize->isNullValue())
3892 getMemsetStores(*this, dl, Chain, Dst, Src, ConstantSize->getZExtValue(),
3893 Align, isVol, DstPtrInfo);
3895 if (Result.getNode())
3899 // Then check to see if we should lower the memset with target-specific
3900 // code. If the target chooses to do this, this is the next best.
3902 TSI.EmitTargetCodeForMemset(*this, dl, Chain, Dst, Src, Size, Align, isVol,
3904 if (Result.getNode())
3907 // Emit a library call.
3908 Type *IntPtrTy = TLI.getDataLayout()->getIntPtrType(*getContext());
3909 TargetLowering::ArgListTy Args;
3910 TargetLowering::ArgListEntry Entry;
3911 Entry.Node = Dst; Entry.Ty = IntPtrTy;
3912 Args.push_back(Entry);
3913 // Extend or truncate the argument to be an i32 value for the call.
3914 if (Src.getValueType().bitsGT(MVT::i32))
3915 Src = getNode(ISD::TRUNCATE, dl, MVT::i32, Src);
3917 Src = getNode(ISD::ZERO_EXTEND, dl, MVT::i32, Src);
3919 Entry.Ty = Type::getInt32Ty(*getContext());
3920 Entry.isSExt = true;
3921 Args.push_back(Entry);
3923 Entry.Ty = IntPtrTy;
3924 Entry.isSExt = false;
3925 Args.push_back(Entry);
3926 // FIXME: pass in DebugLoc
3928 CallLoweringInfo CLI(Chain, Type::getVoidTy(*getContext()),
3929 false, false, false, false, 0,
3930 TLI.getLibcallCallingConv(RTLIB::MEMSET),
3931 /*isTailCall=*/false,
3932 /*doesNotReturn*/false, /*isReturnValueUsed=*/false,
3933 getExternalSymbol(TLI.getLibcallName(RTLIB::MEMSET),
3934 TLI.getPointerTy()),
3936 std::pair<SDValue,SDValue> CallResult = TLI.LowerCallTo(CLI);
3938 return CallResult.second;
3941 SDValue SelectionDAG::getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT,
3942 SDValue Chain, SDValue Ptr, SDValue Cmp,
3943 SDValue Swp, MachinePointerInfo PtrInfo,
3945 AtomicOrdering Ordering,
3946 SynchronizationScope SynchScope) {
3947 if (Alignment == 0) // Ensure that codegen never sees alignment 0
3948 Alignment = getEVTAlignment(MemVT);
3950 MachineFunction &MF = getMachineFunction();
3952 // All atomics are load and store, except for ATMOIC_LOAD and ATOMIC_STORE.
3953 // For now, atomics are considered to be volatile always.
3954 // FIXME: Volatile isn't really correct; we should keep track of atomic
3955 // orderings in the memoperand.
3956 unsigned Flags = MachineMemOperand::MOVolatile;
3957 if (Opcode != ISD::ATOMIC_STORE)
3958 Flags |= MachineMemOperand::MOLoad;
3959 if (Opcode != ISD::ATOMIC_LOAD)
3960 Flags |= MachineMemOperand::MOStore;
3962 MachineMemOperand *MMO =
3963 MF.getMachineMemOperand(PtrInfo, Flags, MemVT.getStoreSize(), Alignment);
3965 return getAtomic(Opcode, dl, MemVT, Chain, Ptr, Cmp, Swp, MMO,
3966 Ordering, SynchScope);
3969 SDValue SelectionDAG::getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT,
3971 SDValue Ptr, SDValue Cmp,
3972 SDValue Swp, MachineMemOperand *MMO,
3973 AtomicOrdering Ordering,
3974 SynchronizationScope SynchScope) {
3975 assert(Opcode == ISD::ATOMIC_CMP_SWAP && "Invalid Atomic Op");
3976 assert(Cmp.getValueType() == Swp.getValueType() && "Invalid Atomic Op Types");
3978 EVT VT = Cmp.getValueType();
3980 SDVTList VTs = getVTList(VT, MVT::Other);
3981 FoldingSetNodeID ID;
3982 ID.AddInteger(MemVT.getRawBits());
3983 SDValue Ops[] = {Chain, Ptr, Cmp, Swp};
3984 AddNodeIDNode(ID, Opcode, VTs, Ops, 4);
3985 ID.AddInteger(MMO->getPointerInfo().getAddrSpace());
3987 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) {
3988 cast<AtomicSDNode>(E)->refineAlignment(MMO);
3989 return SDValue(E, 0);
3991 SDNode *N = new (NodeAllocator) AtomicSDNode(Opcode, dl, VTs, MemVT, Chain,
3992 Ptr, Cmp, Swp, MMO, Ordering,
3994 CSEMap.InsertNode(N, IP);
3995 AllNodes.push_back(N);
3996 return SDValue(N, 0);
3999 SDValue SelectionDAG::getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT,
4001 SDValue Ptr, SDValue Val,
4002 const Value* PtrVal,
4004 AtomicOrdering Ordering,
4005 SynchronizationScope SynchScope) {
4006 if (Alignment == 0) // Ensure that codegen never sees alignment 0
4007 Alignment = getEVTAlignment(MemVT);
4009 MachineFunction &MF = getMachineFunction();
4010 // An atomic store does not load. An atomic load does not store.
4011 // (An atomicrmw obviously both loads and stores.)
4012 // For now, atomics are considered to be volatile always, and they are
4014 // FIXME: Volatile isn't really correct; we should keep track of atomic
4015 // orderings in the memoperand.
4016 unsigned Flags = MachineMemOperand::MOVolatile;
4017 if (Opcode != ISD::ATOMIC_STORE)
4018 Flags |= MachineMemOperand::MOLoad;
4019 if (Opcode != ISD::ATOMIC_LOAD)
4020 Flags |= MachineMemOperand::MOStore;
4022 MachineMemOperand *MMO =
4023 MF.getMachineMemOperand(MachinePointerInfo(PtrVal), Flags,
4024 MemVT.getStoreSize(), Alignment);
4026 return getAtomic(Opcode, dl, MemVT, Chain, Ptr, Val, MMO,
4027 Ordering, SynchScope);
4030 SDValue SelectionDAG::getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT,
4032 SDValue Ptr, SDValue Val,
4033 MachineMemOperand *MMO,
4034 AtomicOrdering Ordering,
4035 SynchronizationScope SynchScope) {
4036 assert((Opcode == ISD::ATOMIC_LOAD_ADD ||
4037 Opcode == ISD::ATOMIC_LOAD_SUB ||
4038 Opcode == ISD::ATOMIC_LOAD_AND ||
4039 Opcode == ISD::ATOMIC_LOAD_OR ||
4040 Opcode == ISD::ATOMIC_LOAD_XOR ||
4041 Opcode == ISD::ATOMIC_LOAD_NAND ||
4042 Opcode == ISD::ATOMIC_LOAD_MIN ||
4043 Opcode == ISD::ATOMIC_LOAD_MAX ||
4044 Opcode == ISD::ATOMIC_LOAD_UMIN ||
4045 Opcode == ISD::ATOMIC_LOAD_UMAX ||
4046 Opcode == ISD::ATOMIC_SWAP ||
4047 Opcode == ISD::ATOMIC_STORE) &&
4048 "Invalid Atomic Op");
4050 EVT VT = Val.getValueType();
4052 SDVTList VTs = Opcode == ISD::ATOMIC_STORE ? getVTList(MVT::Other) :
4053 getVTList(VT, MVT::Other);
4054 FoldingSetNodeID ID;
4055 ID.AddInteger(MemVT.getRawBits());
4056 SDValue Ops[] = {Chain, Ptr, Val};
4057 AddNodeIDNode(ID, Opcode, VTs, Ops, 3);
4058 ID.AddInteger(MMO->getPointerInfo().getAddrSpace());
4060 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) {
4061 cast<AtomicSDNode>(E)->refineAlignment(MMO);
4062 return SDValue(E, 0);
4064 SDNode *N = new (NodeAllocator) AtomicSDNode(Opcode, dl, VTs, MemVT, Chain,
4066 Ordering, SynchScope);
4067 CSEMap.InsertNode(N, IP);
4068 AllNodes.push_back(N);
4069 return SDValue(N, 0);
4072 SDValue SelectionDAG::getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT,
4073 EVT VT, SDValue Chain,
4075 const Value* PtrVal,
4077 AtomicOrdering Ordering,
4078 SynchronizationScope SynchScope) {
4079 if (Alignment == 0) // Ensure that codegen never sees alignment 0
4080 Alignment = getEVTAlignment(MemVT);
4082 MachineFunction &MF = getMachineFunction();
4083 // An atomic store does not load. An atomic load does not store.
4084 // (An atomicrmw obviously both loads and stores.)
4085 // For now, atomics are considered to be volatile always, and they are
4087 // FIXME: Volatile isn't really correct; we should keep track of atomic
4088 // orderings in the memoperand.
4089 unsigned Flags = MachineMemOperand::MOVolatile;
4090 if (Opcode != ISD::ATOMIC_STORE)
4091 Flags |= MachineMemOperand::MOLoad;
4092 if (Opcode != ISD::ATOMIC_LOAD)
4093 Flags |= MachineMemOperand::MOStore;
4095 MachineMemOperand *MMO =
4096 MF.getMachineMemOperand(MachinePointerInfo(PtrVal), Flags,
4097 MemVT.getStoreSize(), Alignment);
4099 return getAtomic(Opcode, dl, MemVT, VT, Chain, Ptr, MMO,
4100 Ordering, SynchScope);
4103 SDValue SelectionDAG::getAtomic(unsigned Opcode, DebugLoc dl, EVT MemVT,
4104 EVT VT, SDValue Chain,
4106 MachineMemOperand *MMO,
4107 AtomicOrdering Ordering,
4108 SynchronizationScope SynchScope) {
4109 assert(Opcode == ISD::ATOMIC_LOAD && "Invalid Atomic Op");
4111 SDVTList VTs = getVTList(VT, MVT::Other);
4112 FoldingSetNodeID ID;
4113 ID.AddInteger(MemVT.getRawBits());
4114 SDValue Ops[] = {Chain, Ptr};
4115 AddNodeIDNode(ID, Opcode, VTs, Ops, 2);
4116 ID.AddInteger(MMO->getPointerInfo().getAddrSpace());
4118 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) {
4119 cast<AtomicSDNode>(E)->refineAlignment(MMO);
4120 return SDValue(E, 0);
4122 SDNode *N = new (NodeAllocator) AtomicSDNode(Opcode, dl, VTs, MemVT, Chain,
4123 Ptr, MMO, Ordering, SynchScope);
4124 CSEMap.InsertNode(N, IP);
4125 AllNodes.push_back(N);
4126 return SDValue(N, 0);
4129 /// getMergeValues - Create a MERGE_VALUES node from the given operands.
4130 SDValue SelectionDAG::getMergeValues(const SDValue *Ops, unsigned NumOps,
4135 SmallVector<EVT, 4> VTs;
4136 VTs.reserve(NumOps);
4137 for (unsigned i = 0; i < NumOps; ++i)
4138 VTs.push_back(Ops[i].getValueType());
4139 return getNode(ISD::MERGE_VALUES, dl, getVTList(&VTs[0], NumOps),
4144 SelectionDAG::getMemIntrinsicNode(unsigned Opcode, DebugLoc dl,
4145 const EVT *VTs, unsigned NumVTs,
4146 const SDValue *Ops, unsigned NumOps,
4147 EVT MemVT, MachinePointerInfo PtrInfo,
4148 unsigned Align, bool Vol,
4149 bool ReadMem, bool WriteMem) {
4150 return getMemIntrinsicNode(Opcode, dl, makeVTList(VTs, NumVTs), Ops, NumOps,
4151 MemVT, PtrInfo, Align, Vol,
4156 SelectionDAG::getMemIntrinsicNode(unsigned Opcode, DebugLoc dl, SDVTList VTList,
4157 const SDValue *Ops, unsigned NumOps,
4158 EVT MemVT, MachinePointerInfo PtrInfo,
4159 unsigned Align, bool Vol,
4160 bool ReadMem, bool WriteMem) {
4161 if (Align == 0) // Ensure that codegen never sees alignment 0
4162 Align = getEVTAlignment(MemVT);
4164 MachineFunction &MF = getMachineFunction();
4167 Flags |= MachineMemOperand::MOStore;
4169 Flags |= MachineMemOperand::MOLoad;
4171 Flags |= MachineMemOperand::MOVolatile;
4172 MachineMemOperand *MMO =
4173 MF.getMachineMemOperand(PtrInfo, Flags, MemVT.getStoreSize(), Align);
4175 return getMemIntrinsicNode(Opcode, dl, VTList, Ops, NumOps, MemVT, MMO);
4179 SelectionDAG::getMemIntrinsicNode(unsigned Opcode, DebugLoc dl, SDVTList VTList,
4180 const SDValue *Ops, unsigned NumOps,
4181 EVT MemVT, MachineMemOperand *MMO) {
4182 assert((Opcode == ISD::INTRINSIC_VOID ||
4183 Opcode == ISD::INTRINSIC_W_CHAIN ||
4184 Opcode == ISD::PREFETCH ||
4185 Opcode == ISD::LIFETIME_START ||
4186 Opcode == ISD::LIFETIME_END ||
4187 (Opcode <= INT_MAX &&
4188 (int)Opcode >= ISD::FIRST_TARGET_MEMORY_OPCODE)) &&
4189 "Opcode is not a memory-accessing opcode!");
4191 // Memoize the node unless it returns a flag.
4192 MemIntrinsicSDNode *N;
4193 if (VTList.VTs[VTList.NumVTs-1] != MVT::Glue) {
4194 FoldingSetNodeID ID;
4195 AddNodeIDNode(ID, Opcode, VTList, Ops, NumOps);
4196 ID.AddInteger(MMO->getPointerInfo().getAddrSpace());
4198 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) {
4199 cast<MemIntrinsicSDNode>(E)->refineAlignment(MMO);
4200 return SDValue(E, 0);
4203 N = new (NodeAllocator) MemIntrinsicSDNode(Opcode, dl, VTList, Ops, NumOps,
4205 CSEMap.InsertNode(N, IP);
4207 N = new (NodeAllocator) MemIntrinsicSDNode(Opcode, dl, VTList, Ops, NumOps,
4210 AllNodes.push_back(N);
4211 return SDValue(N, 0);
4214 /// InferPointerInfo - If the specified ptr/offset is a frame index, infer a
4215 /// MachinePointerInfo record from it. This is particularly useful because the
4216 /// code generator has many cases where it doesn't bother passing in a
4217 /// MachinePointerInfo to getLoad or getStore when it has "FI+Cst".
4218 static MachinePointerInfo InferPointerInfo(SDValue Ptr, int64_t Offset = 0) {
4219 // If this is FI+Offset, we can model it.
4220 if (const FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Ptr))
4221 return MachinePointerInfo::getFixedStack(FI->getIndex(), Offset);
4223 // If this is (FI+Offset1)+Offset2, we can model it.
4224 if (Ptr.getOpcode() != ISD::ADD ||
4225 !isa<ConstantSDNode>(Ptr.getOperand(1)) ||
4226 !isa<FrameIndexSDNode>(Ptr.getOperand(0)))
4227 return MachinePointerInfo();
4229 int FI = cast<FrameIndexSDNode>(Ptr.getOperand(0))->getIndex();
4230 return MachinePointerInfo::getFixedStack(FI, Offset+
4231 cast<ConstantSDNode>(Ptr.getOperand(1))->getSExtValue());
4234 /// InferPointerInfo - If the specified ptr/offset is a frame index, infer a
4235 /// MachinePointerInfo record from it. This is particularly useful because the
4236 /// code generator has many cases where it doesn't bother passing in a
4237 /// MachinePointerInfo to getLoad or getStore when it has "FI+Cst".
4238 static MachinePointerInfo InferPointerInfo(SDValue Ptr, SDValue OffsetOp) {
4239 // If the 'Offset' value isn't a constant, we can't handle this.
4240 if (ConstantSDNode *OffsetNode = dyn_cast<ConstantSDNode>(OffsetOp))
4241 return InferPointerInfo(Ptr, OffsetNode->getSExtValue());
4242 if (OffsetOp.getOpcode() == ISD::UNDEF)
4243 return InferPointerInfo(Ptr);
4244 return MachinePointerInfo();
4249 SelectionDAG::getLoad(ISD::MemIndexedMode AM, ISD::LoadExtType ExtType,
4250 EVT VT, DebugLoc dl, SDValue Chain,
4251 SDValue Ptr, SDValue Offset,
4252 MachinePointerInfo PtrInfo, EVT MemVT,
4253 bool isVolatile, bool isNonTemporal, bool isInvariant,
4254 unsigned Alignment, const MDNode *TBAAInfo,
4255 const MDNode *Ranges) {
4256 assert(Chain.getValueType() == MVT::Other &&
4257 "Invalid chain type");
4258 if (Alignment == 0) // Ensure that codegen never sees alignment 0
4259 Alignment = getEVTAlignment(VT);
4261 unsigned Flags = MachineMemOperand::MOLoad;
4263 Flags |= MachineMemOperand::MOVolatile;
4265 Flags |= MachineMemOperand::MONonTemporal;
4267 Flags |= MachineMemOperand::MOInvariant;
4269 // If we don't have a PtrInfo, infer the trivial frame index case to simplify
4272 PtrInfo = InferPointerInfo(Ptr, Offset);
4274 MachineFunction &MF = getMachineFunction();
4275 MachineMemOperand *MMO =
4276 MF.getMachineMemOperand(PtrInfo, Flags, MemVT.getStoreSize(), Alignment,
4278 return getLoad(AM, ExtType, VT, dl, Chain, Ptr, Offset, MemVT, MMO);
4282 SelectionDAG::getLoad(ISD::MemIndexedMode AM, ISD::LoadExtType ExtType,
4283 EVT VT, DebugLoc dl, SDValue Chain,
4284 SDValue Ptr, SDValue Offset, EVT MemVT,
4285 MachineMemOperand *MMO) {
4287 ExtType = ISD::NON_EXTLOAD;
4288 } else if (ExtType == ISD::NON_EXTLOAD) {
4289 assert(VT == MemVT && "Non-extending load from different memory type!");
4292 assert(MemVT.getScalarType().bitsLT(VT.getScalarType()) &&
4293 "Should only be an extending load, not truncating!");
4294 assert(VT.isInteger() == MemVT.isInteger() &&
4295 "Cannot convert from FP to Int or Int -> FP!");
4296 assert(VT.isVector() == MemVT.isVector() &&
4297 "Cannot use trunc store to convert to or from a vector!");
4298 assert((!VT.isVector() ||
4299 VT.getVectorNumElements() == MemVT.getVectorNumElements()) &&
4300 "Cannot use trunc store to change the number of vector elements!");
4303 bool Indexed = AM != ISD::UNINDEXED;
4304 assert((Indexed || Offset.getOpcode() == ISD::UNDEF) &&
4305 "Unindexed load with an offset!");
4307 SDVTList VTs = Indexed ?
4308 getVTList(VT, Ptr.getValueType(), MVT::Other) : getVTList(VT, MVT::Other);
4309 SDValue Ops[] = { Chain, Ptr, Offset };
4310 FoldingSetNodeID ID;
4311 AddNodeIDNode(ID, ISD::LOAD, VTs, Ops, 3);
4312 ID.AddInteger(MemVT.getRawBits());
4313 ID.AddInteger(encodeMemSDNodeFlags(ExtType, AM, MMO->isVolatile(),
4314 MMO->isNonTemporal(),
4315 MMO->isInvariant()));
4316 ID.AddInteger(MMO->getPointerInfo().getAddrSpace());
4318 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) {
4319 cast<LoadSDNode>(E)->refineAlignment(MMO);
4320 return SDValue(E, 0);
4322 SDNode *N = new (NodeAllocator) LoadSDNode(Ops, dl, VTs, AM, ExtType,
4324 CSEMap.InsertNode(N, IP);
4325 AllNodes.push_back(N);
4326 return SDValue(N, 0);
4329 SDValue SelectionDAG::getLoad(EVT VT, DebugLoc dl,
4330 SDValue Chain, SDValue Ptr,
4331 MachinePointerInfo PtrInfo,
4332 bool isVolatile, bool isNonTemporal,
4333 bool isInvariant, unsigned Alignment,
4334 const MDNode *TBAAInfo,
4335 const MDNode *Ranges) {
4336 SDValue Undef = getUNDEF(Ptr.getValueType());
4337 return getLoad(ISD::UNINDEXED, ISD::NON_EXTLOAD, VT, dl, Chain, Ptr, Undef,
4338 PtrInfo, VT, isVolatile, isNonTemporal, isInvariant, Alignment,
4342 SDValue SelectionDAG::getExtLoad(ISD::LoadExtType ExtType, DebugLoc dl, EVT VT,
4343 SDValue Chain, SDValue Ptr,
4344 MachinePointerInfo PtrInfo, EVT MemVT,
4345 bool isVolatile, bool isNonTemporal,
4346 unsigned Alignment, const MDNode *TBAAInfo) {
4347 SDValue Undef = getUNDEF(Ptr.getValueType());
4348 return getLoad(ISD::UNINDEXED, ExtType, VT, dl, Chain, Ptr, Undef,
4349 PtrInfo, MemVT, isVolatile, isNonTemporal, false, Alignment,
4355 SelectionDAG::getIndexedLoad(SDValue OrigLoad, DebugLoc dl, SDValue Base,
4356 SDValue Offset, ISD::MemIndexedMode AM) {
4357 LoadSDNode *LD = cast<LoadSDNode>(OrigLoad);
4358 assert(LD->getOffset().getOpcode() == ISD::UNDEF &&
4359 "Load is already a indexed load!");
4360 return getLoad(AM, LD->getExtensionType(), OrigLoad.getValueType(), dl,
4361 LD->getChain(), Base, Offset, LD->getPointerInfo(),
4362 LD->getMemoryVT(), LD->isVolatile(), LD->isNonTemporal(),
4363 false, LD->getAlignment());
4366 SDValue SelectionDAG::getStore(SDValue Chain, DebugLoc dl, SDValue Val,
4367 SDValue Ptr, MachinePointerInfo PtrInfo,
4368 bool isVolatile, bool isNonTemporal,
4369 unsigned Alignment, const MDNode *TBAAInfo) {
4370 assert(Chain.getValueType() == MVT::Other &&
4371 "Invalid chain type");
4372 if (Alignment == 0) // Ensure that codegen never sees alignment 0
4373 Alignment = getEVTAlignment(Val.getValueType());
4375 unsigned Flags = MachineMemOperand::MOStore;
4377 Flags |= MachineMemOperand::MOVolatile;
4379 Flags |= MachineMemOperand::MONonTemporal;
4382 PtrInfo = InferPointerInfo(Ptr);
4384 MachineFunction &MF = getMachineFunction();
4385 MachineMemOperand *MMO =
4386 MF.getMachineMemOperand(PtrInfo, Flags,
4387 Val.getValueType().getStoreSize(), Alignment,
4390 return getStore(Chain, dl, Val, Ptr, MMO);
4393 SDValue SelectionDAG::getStore(SDValue Chain, DebugLoc dl, SDValue Val,
4394 SDValue Ptr, MachineMemOperand *MMO) {
4395 assert(Chain.getValueType() == MVT::Other &&
4396 "Invalid chain type");
4397 EVT VT = Val.getValueType();
4398 SDVTList VTs = getVTList(MVT::Other);
4399 SDValue Undef = getUNDEF(Ptr.getValueType());
4400 SDValue Ops[] = { Chain, Val, Ptr, Undef };
4401 FoldingSetNodeID ID;
4402 AddNodeIDNode(ID, ISD::STORE, VTs, Ops, 4);
4403 ID.AddInteger(VT.getRawBits());
4404 ID.AddInteger(encodeMemSDNodeFlags(false, ISD::UNINDEXED, MMO->isVolatile(),
4405 MMO->isNonTemporal(), MMO->isInvariant()));
4406 ID.AddInteger(MMO->getPointerInfo().getAddrSpace());
4408 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) {
4409 cast<StoreSDNode>(E)->refineAlignment(MMO);
4410 return SDValue(E, 0);
4412 SDNode *N = new (NodeAllocator) StoreSDNode(Ops, dl, VTs, ISD::UNINDEXED,
4414 CSEMap.InsertNode(N, IP);
4415 AllNodes.push_back(N);
4416 return SDValue(N, 0);
4419 SDValue SelectionDAG::getTruncStore(SDValue Chain, DebugLoc dl, SDValue Val,
4420 SDValue Ptr, MachinePointerInfo PtrInfo,
4421 EVT SVT,bool isVolatile, bool isNonTemporal,
4423 const MDNode *TBAAInfo) {
4424 assert(Chain.getValueType() == MVT::Other &&
4425 "Invalid chain type");
4426 if (Alignment == 0) // Ensure that codegen never sees alignment 0
4427 Alignment = getEVTAlignment(SVT);
4429 unsigned Flags = MachineMemOperand::MOStore;
4431 Flags |= MachineMemOperand::MOVolatile;
4433 Flags |= MachineMemOperand::MONonTemporal;
4436 PtrInfo = InferPointerInfo(Ptr);
4438 MachineFunction &MF = getMachineFunction();
4439 MachineMemOperand *MMO =
4440 MF.getMachineMemOperand(PtrInfo, Flags, SVT.getStoreSize(), Alignment,
4443 return getTruncStore(Chain, dl, Val, Ptr, SVT, MMO);
4446 SDValue SelectionDAG::getTruncStore(SDValue Chain, DebugLoc dl, SDValue Val,
4447 SDValue Ptr, EVT SVT,
4448 MachineMemOperand *MMO) {
4449 EVT VT = Val.getValueType();
4451 assert(Chain.getValueType() == MVT::Other &&
4452 "Invalid chain type");
4454 return getStore(Chain, dl, Val, Ptr, MMO);
4456 assert(SVT.getScalarType().bitsLT(VT.getScalarType()) &&
4457 "Should only be a truncating store, not extending!");
4458 assert(VT.isInteger() == SVT.isInteger() &&
4459 "Can't do FP-INT conversion!");
4460 assert(VT.isVector() == SVT.isVector() &&
4461 "Cannot use trunc store to convert to or from a vector!");
4462 assert((!VT.isVector() ||
4463 VT.getVectorNumElements() == SVT.getVectorNumElements()) &&
4464 "Cannot use trunc store to change the number of vector elements!");
4466 SDVTList VTs = getVTList(MVT::Other);
4467 SDValue Undef = getUNDEF(Ptr.getValueType());
4468 SDValue Ops[] = { Chain, Val, Ptr, Undef };
4469 FoldingSetNodeID ID;
4470 AddNodeIDNode(ID, ISD::STORE, VTs, Ops, 4);
4471 ID.AddInteger(SVT.getRawBits());
4472 ID.AddInteger(encodeMemSDNodeFlags(true, ISD::UNINDEXED, MMO->isVolatile(),
4473 MMO->isNonTemporal(), MMO->isInvariant()));
4474 ID.AddInteger(MMO->getPointerInfo().getAddrSpace());
4476 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) {
4477 cast<StoreSDNode>(E)->refineAlignment(MMO);
4478 return SDValue(E, 0);
4480 SDNode *N = new (NodeAllocator) StoreSDNode(Ops, dl, VTs, ISD::UNINDEXED,
4482 CSEMap.InsertNode(N, IP);
4483 AllNodes.push_back(N);
4484 return SDValue(N, 0);
4488 SelectionDAG::getIndexedStore(SDValue OrigStore, DebugLoc dl, SDValue Base,
4489 SDValue Offset, ISD::MemIndexedMode AM) {
4490 StoreSDNode *ST = cast<StoreSDNode>(OrigStore);
4491 assert(ST->getOffset().getOpcode() == ISD::UNDEF &&
4492 "Store is already a indexed store!");
4493 SDVTList VTs = getVTList(Base.getValueType(), MVT::Other);
4494 SDValue Ops[] = { ST->getChain(), ST->getValue(), Base, Offset };
4495 FoldingSetNodeID ID;
4496 AddNodeIDNode(ID, ISD::STORE, VTs, Ops, 4);
4497 ID.AddInteger(ST->getMemoryVT().getRawBits());
4498 ID.AddInteger(ST->getRawSubclassData());
4499 ID.AddInteger(ST->getPointerInfo().getAddrSpace());
4501 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
4502 return SDValue(E, 0);
4504 SDNode *N = new (NodeAllocator) StoreSDNode(Ops, dl, VTs, AM,
4505 ST->isTruncatingStore(),
4507 ST->getMemOperand());
4508 CSEMap.InsertNode(N, IP);
4509 AllNodes.push_back(N);
4510 return SDValue(N, 0);
4513 SDValue SelectionDAG::getVAArg(EVT VT, DebugLoc dl,
4514 SDValue Chain, SDValue Ptr,
4517 SDValue Ops[] = { Chain, Ptr, SV, getTargetConstant(Align, MVT::i32) };
4518 return getNode(ISD::VAARG, dl, getVTList(VT, MVT::Other), Ops, 4);
4521 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT,
4522 const SDUse *Ops, unsigned NumOps) {
4524 case 0: return getNode(Opcode, DL, VT);
4525 case 1: return getNode(Opcode, DL, VT, Ops[0]);
4526 case 2: return getNode(Opcode, DL, VT, Ops[0], Ops[1]);
4527 case 3: return getNode(Opcode, DL, VT, Ops[0], Ops[1], Ops[2]);
4531 // Copy from an SDUse array into an SDValue array for use with
4532 // the regular getNode logic.
4533 SmallVector<SDValue, 8> NewOps(Ops, Ops + NumOps);
4534 return getNode(Opcode, DL, VT, &NewOps[0], NumOps);
4537 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT,
4538 const SDValue *Ops, unsigned NumOps) {
4540 case 0: return getNode(Opcode, DL, VT);
4541 case 1: return getNode(Opcode, DL, VT, Ops[0]);
4542 case 2: return getNode(Opcode, DL, VT, Ops[0], Ops[1]);
4543 case 3: return getNode(Opcode, DL, VT, Ops[0], Ops[1], Ops[2]);
4549 case ISD::SELECT_CC: {
4550 assert(NumOps == 5 && "SELECT_CC takes 5 operands!");
4551 assert(Ops[0].getValueType() == Ops[1].getValueType() &&
4552 "LHS and RHS of condition must have same type!");
4553 assert(Ops[2].getValueType() == Ops[3].getValueType() &&
4554 "True and False arms of SelectCC must have same type!");
4555 assert(Ops[2].getValueType() == VT &&
4556 "select_cc node must be of same type as true and false value!");
4560 assert(NumOps == 5 && "BR_CC takes 5 operands!");
4561 assert(Ops[2].getValueType() == Ops[3].getValueType() &&
4562 "LHS/RHS of comparison should match types!");
4569 SDVTList VTs = getVTList(VT);
4571 if (VT != MVT::Glue) {
4572 FoldingSetNodeID ID;
4573 AddNodeIDNode(ID, Opcode, VTs, Ops, NumOps);
4576 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
4577 return SDValue(E, 0);
4579 N = new (NodeAllocator) SDNode(Opcode, DL, VTs, Ops, NumOps);
4580 CSEMap.InsertNode(N, IP);
4582 N = new (NodeAllocator) SDNode(Opcode, DL, VTs, Ops, NumOps);
4585 AllNodes.push_back(N);
4589 return SDValue(N, 0);
4592 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL,
4593 const std::vector<EVT> &ResultTys,
4594 const SDValue *Ops, unsigned NumOps) {
4595 return getNode(Opcode, DL, getVTList(&ResultTys[0], ResultTys.size()),
4599 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL,
4600 const EVT *VTs, unsigned NumVTs,
4601 const SDValue *Ops, unsigned NumOps) {
4603 return getNode(Opcode, DL, VTs[0], Ops, NumOps);
4604 return getNode(Opcode, DL, makeVTList(VTs, NumVTs), Ops, NumOps);
4607 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList,
4608 const SDValue *Ops, unsigned NumOps) {
4609 if (VTList.NumVTs == 1)
4610 return getNode(Opcode, DL, VTList.VTs[0], Ops, NumOps);
4614 // FIXME: figure out how to safely handle things like
4615 // int foo(int x) { return 1 << (x & 255); }
4616 // int bar() { return foo(256); }
4617 case ISD::SRA_PARTS:
4618 case ISD::SRL_PARTS:
4619 case ISD::SHL_PARTS:
4620 if (N3.getOpcode() == ISD::SIGN_EXTEND_INREG &&
4621 cast<VTSDNode>(N3.getOperand(1))->getVT() != MVT::i1)
4622 return getNode(Opcode, DL, VT, N1, N2, N3.getOperand(0));
4623 else if (N3.getOpcode() == ISD::AND)
4624 if (ConstantSDNode *AndRHS = dyn_cast<ConstantSDNode>(N3.getOperand(1))) {
4625 // If the and is only masking out bits that cannot effect the shift,
4626 // eliminate the and.
4627 unsigned NumBits = VT.getScalarType().getSizeInBits()*2;
4628 if ((AndRHS->getValue() & (NumBits-1)) == NumBits-1)
4629 return getNode(Opcode, DL, VT, N1, N2, N3.getOperand(0));
4635 // Memoize the node unless it returns a flag.
4637 if (VTList.VTs[VTList.NumVTs-1] != MVT::Glue) {
4638 FoldingSetNodeID ID;
4639 AddNodeIDNode(ID, Opcode, VTList, Ops, NumOps);
4641 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
4642 return SDValue(E, 0);
4645 N = new (NodeAllocator) UnarySDNode(Opcode, DL, VTList, Ops[0]);
4646 } else if (NumOps == 2) {
4647 N = new (NodeAllocator) BinarySDNode(Opcode, DL, VTList, Ops[0], Ops[1]);
4648 } else if (NumOps == 3) {
4649 N = new (NodeAllocator) TernarySDNode(Opcode, DL, VTList, Ops[0], Ops[1],
4652 N = new (NodeAllocator) SDNode(Opcode, DL, VTList, Ops, NumOps);
4654 CSEMap.InsertNode(N, IP);
4657 N = new (NodeAllocator) UnarySDNode(Opcode, DL, VTList, Ops[0]);
4658 } else if (NumOps == 2) {
4659 N = new (NodeAllocator) BinarySDNode(Opcode, DL, VTList, Ops[0], Ops[1]);
4660 } else if (NumOps == 3) {
4661 N = new (NodeAllocator) TernarySDNode(Opcode, DL, VTList, Ops[0], Ops[1],
4664 N = new (NodeAllocator) SDNode(Opcode, DL, VTList, Ops, NumOps);
4667 AllNodes.push_back(N);
4671 return SDValue(N, 0);
4674 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList) {
4675 return getNode(Opcode, DL, VTList, 0, 0);
4678 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList,
4680 SDValue Ops[] = { N1 };
4681 return getNode(Opcode, DL, VTList, Ops, 1);
4684 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList,
4685 SDValue N1, SDValue N2) {
4686 SDValue Ops[] = { N1, N2 };
4687 return getNode(Opcode, DL, VTList, Ops, 2);
4690 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList,
4691 SDValue N1, SDValue N2, SDValue N3) {
4692 SDValue Ops[] = { N1, N2, N3 };
4693 return getNode(Opcode, DL, VTList, Ops, 3);
4696 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList,
4697 SDValue N1, SDValue N2, SDValue N3,
4699 SDValue Ops[] = { N1, N2, N3, N4 };
4700 return getNode(Opcode, DL, VTList, Ops, 4);
4703 SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, SDVTList VTList,
4704 SDValue N1, SDValue N2, SDValue N3,
4705 SDValue N4, SDValue N5) {
4706 SDValue Ops[] = { N1, N2, N3, N4, N5 };
4707 return getNode(Opcode, DL, VTList, Ops, 5);
4710 SDVTList SelectionDAG::getVTList(EVT VT) {
4711 return makeVTList(SDNode::getValueTypeList(VT), 1);
4714 SDVTList SelectionDAG::getVTList(EVT VT1, EVT VT2) {
4715 for (std::vector<SDVTList>::reverse_iterator I = VTList.rbegin(),
4716 E = VTList.rend(); I != E; ++I)
4717 if (I->NumVTs == 2 && I->VTs[0] == VT1 && I->VTs[1] == VT2)
4720 EVT *Array = Allocator.Allocate<EVT>(2);
4723 SDVTList Result = makeVTList(Array, 2);
4724 VTList.push_back(Result);
4728 SDVTList SelectionDAG::getVTList(EVT VT1, EVT VT2, EVT VT3) {
4729 for (std::vector<SDVTList>::reverse_iterator I = VTList.rbegin(),
4730 E = VTList.rend(); I != E; ++I)
4731 if (I->NumVTs == 3 && I->VTs[0] == VT1 && I->VTs[1] == VT2 &&
4735 EVT *Array = Allocator.Allocate<EVT>(3);
4739 SDVTList Result = makeVTList(Array, 3);
4740 VTList.push_back(Result);
4744 SDVTList SelectionDAG::getVTList(EVT VT1, EVT VT2, EVT VT3, EVT VT4) {
4745 for (std::vector<SDVTList>::reverse_iterator I = VTList.rbegin(),
4746 E = VTList.rend(); I != E; ++I)
4747 if (I->NumVTs == 4 && I->VTs[0] == VT1 && I->VTs[1] == VT2 &&
4748 I->VTs[2] == VT3 && I->VTs[3] == VT4)
4751 EVT *Array = Allocator.Allocate<EVT>(4);
4756 SDVTList Result = makeVTList(Array, 4);
4757 VTList.push_back(Result);
4761 SDVTList SelectionDAG::getVTList(const EVT *VTs, unsigned NumVTs) {
4763 case 0: llvm_unreachable("Cannot have nodes without results!");
4764 case 1: return getVTList(VTs[0]);
4765 case 2: return getVTList(VTs[0], VTs[1]);
4766 case 3: return getVTList(VTs[0], VTs[1], VTs[2]);
4767 case 4: return getVTList(VTs[0], VTs[1], VTs[2], VTs[3]);
4771 for (std::vector<SDVTList>::reverse_iterator I = VTList.rbegin(),
4772 E = VTList.rend(); I != E; ++I) {
4773 if (I->NumVTs != NumVTs || VTs[0] != I->VTs[0] || VTs[1] != I->VTs[1])
4776 if (std::equal(&VTs[2], &VTs[NumVTs], &I->VTs[2]))
4780 EVT *Array = Allocator.Allocate<EVT>(NumVTs);
4781 std::copy(VTs, VTs+NumVTs, Array);
4782 SDVTList Result = makeVTList(Array, NumVTs);
4783 VTList.push_back(Result);
4788 /// UpdateNodeOperands - *Mutate* the specified node in-place to have the
4789 /// specified operands. If the resultant node already exists in the DAG,
4790 /// this does not modify the specified node, instead it returns the node that
4791 /// already exists. If the resultant node does not exist in the DAG, the
4792 /// input node is returned. As a degenerate case, if you specify the same
4793 /// input operands as the node already has, the input node is returned.
4794 SDNode *SelectionDAG::UpdateNodeOperands(SDNode *N, SDValue Op) {
4795 assert(N->getNumOperands() == 1 && "Update with wrong number of operands");
4797 // Check to see if there is no change.
4798 if (Op == N->getOperand(0)) return N;
4800 // See if the modified node already exists.
4801 void *InsertPos = 0;
4802 if (SDNode *Existing = FindModifiedNodeSlot(N, Op, InsertPos))
4805 // Nope it doesn't. Remove the node from its current place in the maps.
4807 if (!RemoveNodeFromCSEMaps(N))
4810 // Now we update the operands.
4811 N->OperandList[0].set(Op);
4813 // If this gets put into a CSE map, add it.
4814 if (InsertPos) CSEMap.InsertNode(N, InsertPos);
4818 SDNode *SelectionDAG::UpdateNodeOperands(SDNode *N, SDValue Op1, SDValue Op2) {
4819 assert(N->getNumOperands() == 2 && "Update with wrong number of operands");
4821 // Check to see if there is no change.
4822 if (Op1 == N->getOperand(0) && Op2 == N->getOperand(1))
4823 return N; // No operands changed, just return the input node.
4825 // See if the modified node already exists.
4826 void *InsertPos = 0;
4827 if (SDNode *Existing = FindModifiedNodeSlot(N, Op1, Op2, InsertPos))
4830 // Nope it doesn't. Remove the node from its current place in the maps.
4832 if (!RemoveNodeFromCSEMaps(N))
4835 // Now we update the operands.
4836 if (N->OperandList[0] != Op1)
4837 N->OperandList[0].set(Op1);
4838 if (N->OperandList[1] != Op2)
4839 N->OperandList[1].set(Op2);
4841 // If this gets put into a CSE map, add it.
4842 if (InsertPos) CSEMap.InsertNode(N, InsertPos);
4846 SDNode *SelectionDAG::
4847 UpdateNodeOperands(SDNode *N, SDValue Op1, SDValue Op2, SDValue Op3) {
4848 SDValue Ops[] = { Op1, Op2, Op3 };
4849 return UpdateNodeOperands(N, Ops, 3);
4852 SDNode *SelectionDAG::
4853 UpdateNodeOperands(SDNode *N, SDValue Op1, SDValue Op2,
4854 SDValue Op3, SDValue Op4) {
4855 SDValue Ops[] = { Op1, Op2, Op3, Op4 };
4856 return UpdateNodeOperands(N, Ops, 4);
4859 SDNode *SelectionDAG::
4860 UpdateNodeOperands(SDNode *N, SDValue Op1, SDValue Op2,
4861 SDValue Op3, SDValue Op4, SDValue Op5) {
4862 SDValue Ops[] = { Op1, Op2, Op3, Op4, Op5 };
4863 return UpdateNodeOperands(N, Ops, 5);
4866 SDNode *SelectionDAG::
4867 UpdateNodeOperands(SDNode *N, const SDValue *Ops, unsigned NumOps) {
4868 assert(N->getNumOperands() == NumOps &&
4869 "Update with wrong number of operands");
4871 // Check to see if there is no change.
4872 bool AnyChange = false;
4873 for (unsigned i = 0; i != NumOps; ++i) {
4874 if (Ops[i] != N->getOperand(i)) {
4880 // No operands changed, just return the input node.
4881 if (!AnyChange) return N;
4883 // See if the modified node already exists.
4884 void *InsertPos = 0;
4885 if (SDNode *Existing = FindModifiedNodeSlot(N, Ops, NumOps, InsertPos))
4888 // Nope it doesn't. Remove the node from its current place in the maps.
4890 if (!RemoveNodeFromCSEMaps(N))
4893 // Now we update the operands.
4894 for (unsigned i = 0; i != NumOps; ++i)
4895 if (N->OperandList[i] != Ops[i])
4896 N->OperandList[i].set(Ops[i]);
4898 // If this gets put into a CSE map, add it.
4899 if (InsertPos) CSEMap.InsertNode(N, InsertPos);
4903 /// DropOperands - Release the operands and set this node to have
4905 void SDNode::DropOperands() {
4906 // Unlike the code in MorphNodeTo that does this, we don't need to
4907 // watch for dead nodes here.
4908 for (op_iterator I = op_begin(), E = op_end(); I != E; ) {
4914 /// SelectNodeTo - These are wrappers around MorphNodeTo that accept a
4917 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4919 SDVTList VTs = getVTList(VT);
4920 return SelectNodeTo(N, MachineOpc, VTs, 0, 0);
4923 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4924 EVT VT, SDValue Op1) {
4925 SDVTList VTs = getVTList(VT);
4926 SDValue Ops[] = { Op1 };
4927 return SelectNodeTo(N, MachineOpc, VTs, Ops, 1);
4930 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4931 EVT VT, SDValue Op1,
4933 SDVTList VTs = getVTList(VT);
4934 SDValue Ops[] = { Op1, Op2 };
4935 return SelectNodeTo(N, MachineOpc, VTs, Ops, 2);
4938 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4939 EVT VT, SDValue Op1,
4940 SDValue Op2, SDValue Op3) {
4941 SDVTList VTs = getVTList(VT);
4942 SDValue Ops[] = { Op1, Op2, Op3 };
4943 return SelectNodeTo(N, MachineOpc, VTs, Ops, 3);
4946 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4947 EVT VT, const SDValue *Ops,
4949 SDVTList VTs = getVTList(VT);
4950 return SelectNodeTo(N, MachineOpc, VTs, Ops, NumOps);
4953 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4954 EVT VT1, EVT VT2, const SDValue *Ops,
4956 SDVTList VTs = getVTList(VT1, VT2);
4957 return SelectNodeTo(N, MachineOpc, VTs, Ops, NumOps);
4960 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4962 SDVTList VTs = getVTList(VT1, VT2);
4963 return SelectNodeTo(N, MachineOpc, VTs, (SDValue *)0, 0);
4966 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4967 EVT VT1, EVT VT2, EVT VT3,
4968 const SDValue *Ops, unsigned NumOps) {
4969 SDVTList VTs = getVTList(VT1, VT2, VT3);
4970 return SelectNodeTo(N, MachineOpc, VTs, Ops, NumOps);
4973 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4974 EVT VT1, EVT VT2, EVT VT3, EVT VT4,
4975 const SDValue *Ops, unsigned NumOps) {
4976 SDVTList VTs = getVTList(VT1, VT2, VT3, VT4);
4977 return SelectNodeTo(N, MachineOpc, VTs, Ops, NumOps);
4980 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4983 SDVTList VTs = getVTList(VT1, VT2);
4984 SDValue Ops[] = { Op1 };
4985 return SelectNodeTo(N, MachineOpc, VTs, Ops, 1);
4988 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4990 SDValue Op1, SDValue Op2) {
4991 SDVTList VTs = getVTList(VT1, VT2);
4992 SDValue Ops[] = { Op1, Op2 };
4993 return SelectNodeTo(N, MachineOpc, VTs, Ops, 2);
4996 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
4998 SDValue Op1, SDValue Op2,
5000 SDVTList VTs = getVTList(VT1, VT2);
5001 SDValue Ops[] = { Op1, Op2, Op3 };
5002 return SelectNodeTo(N, MachineOpc, VTs, Ops, 3);
5005 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
5006 EVT VT1, EVT VT2, EVT VT3,
5007 SDValue Op1, SDValue Op2,
5009 SDVTList VTs = getVTList(VT1, VT2, VT3);
5010 SDValue Ops[] = { Op1, Op2, Op3 };
5011 return SelectNodeTo(N, MachineOpc, VTs, Ops, 3);
5014 SDNode *SelectionDAG::SelectNodeTo(SDNode *N, unsigned MachineOpc,
5015 SDVTList VTs, const SDValue *Ops,
5017 N = MorphNodeTo(N, ~MachineOpc, VTs, Ops, NumOps);
5018 // Reset the NodeID to -1.
5023 /// UpdadeDebugLocOnMergedSDNode - If the opt level is -O0 then it throws away
5024 /// the line number information on the merged node since it is not possible to
5025 /// preserve the information that operation is associated with multiple lines.
5026 /// This will make the debugger working better at -O0, were there is a higher
5027 /// probability having other instructions associated with that line.
5029 SDNode *SelectionDAG::UpdadeDebugLocOnMergedSDNode(SDNode *N, DebugLoc OLoc) {
5030 DebugLoc NLoc = N->getDebugLoc();
5031 if (!(NLoc.isUnknown()) && (OptLevel == CodeGenOpt::None) && (OLoc != NLoc)) {
5032 N->setDebugLoc(DebugLoc());
5037 /// MorphNodeTo - This *mutates* the specified node to have the specified
5038 /// return type, opcode, and operands.
5040 /// Note that MorphNodeTo returns the resultant node. If there is already a
5041 /// node of the specified opcode and operands, it returns that node instead of
5042 /// the current one. Note that the DebugLoc need not be the same.
5044 /// Using MorphNodeTo is faster than creating a new node and swapping it in
5045 /// with ReplaceAllUsesWith both because it often avoids allocating a new
5046 /// node, and because it doesn't require CSE recalculation for any of
5047 /// the node's users.
5049 SDNode *SelectionDAG::MorphNodeTo(SDNode *N, unsigned Opc,
5050 SDVTList VTs, const SDValue *Ops,
5052 // If an identical node already exists, use it.
5054 if (VTs.VTs[VTs.NumVTs-1] != MVT::Glue) {
5055 FoldingSetNodeID ID;
5056 AddNodeIDNode(ID, Opc, VTs, Ops, NumOps);
5057 if (SDNode *ON = CSEMap.FindNodeOrInsertPos(ID, IP))
5058 return UpdadeDebugLocOnMergedSDNode(ON, N->getDebugLoc());
5061 if (!RemoveNodeFromCSEMaps(N))
5064 // Start the morphing.
5066 N->ValueList = VTs.VTs;
5067 N->NumValues = VTs.NumVTs;
5069 // Clear the operands list, updating used nodes to remove this from their
5070 // use list. Keep track of any operands that become dead as a result.
5071 SmallPtrSet<SDNode*, 16> DeadNodeSet;
5072 for (SDNode::op_iterator I = N->op_begin(), E = N->op_end(); I != E; ) {
5074 SDNode *Used = Use.getNode();
5076 if (Used->use_empty())
5077 DeadNodeSet.insert(Used);
5080 if (MachineSDNode *MN = dyn_cast<MachineSDNode>(N)) {
5081 // Initialize the memory references information.
5082 MN->setMemRefs(0, 0);
5083 // If NumOps is larger than the # of operands we can have in a
5084 // MachineSDNode, reallocate the operand list.
5085 if (NumOps > MN->NumOperands || !MN->OperandsNeedDelete) {
5086 if (MN->OperandsNeedDelete)
5087 delete[] MN->OperandList;
5088 if (NumOps > array_lengthof(MN->LocalOperands))
5089 // We're creating a final node that will live unmorphed for the
5090 // remainder of the current SelectionDAG iteration, so we can allocate
5091 // the operands directly out of a pool with no recycling metadata.
5092 MN->InitOperands(OperandAllocator.Allocate<SDUse>(NumOps),
5095 MN->InitOperands(MN->LocalOperands, Ops, NumOps);
5096 MN->OperandsNeedDelete = false;
5098 MN->InitOperands(MN->OperandList, Ops, NumOps);
5100 // If NumOps is larger than the # of operands we currently have, reallocate
5101 // the operand list.
5102 if (NumOps > N->NumOperands) {
5103 if (N->OperandsNeedDelete)
5104 delete[] N->OperandList;
5105 N->InitOperands(new SDUse[NumOps], Ops, NumOps);
5106 N->OperandsNeedDelete = true;
5108 N->InitOperands(N->OperandList, Ops, NumOps);
5111 // Delete any nodes that are still dead after adding the uses for the
5113 if (!DeadNodeSet.empty()) {
5114 SmallVector<SDNode *, 16> DeadNodes;
5115 for (SmallPtrSet<SDNode *, 16>::iterator I = DeadNodeSet.begin(),
5116 E = DeadNodeSet.end(); I != E; ++I)
5117 if ((*I)->use_empty())
5118 DeadNodes.push_back(*I);
5119 RemoveDeadNodes(DeadNodes);
5123 CSEMap.InsertNode(N, IP); // Memoize the new node.
5128 /// getMachineNode - These are used for target selectors to create a new node
5129 /// with specified return type(s), MachineInstr opcode, and operands.
5131 /// Note that getMachineNode returns the resultant node. If there is already a
5132 /// node of the specified opcode and operands, it returns that node instead of
5133 /// the current one.
5135 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT) {
5136 SDVTList VTs = getVTList(VT);
5137 return getMachineNode(Opcode, dl, VTs, 0, 0);
5141 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT, SDValue Op1) {
5142 SDVTList VTs = getVTList(VT);
5143 SDValue Ops[] = { Op1 };
5144 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops));
5148 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT,
5149 SDValue Op1, SDValue Op2) {
5150 SDVTList VTs = getVTList(VT);
5151 SDValue Ops[] = { Op1, Op2 };
5152 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops));
5156 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT,
5157 SDValue Op1, SDValue Op2, SDValue Op3) {
5158 SDVTList VTs = getVTList(VT);
5159 SDValue Ops[] = { Op1, Op2, Op3 };
5160 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops));
5164 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT,
5165 const SDValue *Ops, unsigned NumOps) {
5166 SDVTList VTs = getVTList(VT);
5167 return getMachineNode(Opcode, dl, VTs, Ops, NumOps);
5171 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT1, EVT VT2) {
5172 SDVTList VTs = getVTList(VT1, VT2);
5173 return getMachineNode(Opcode, dl, VTs, 0, 0);
5177 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl,
5178 EVT VT1, EVT VT2, SDValue Op1) {
5179 SDVTList VTs = getVTList(VT1, VT2);
5180 SDValue Ops[] = { Op1 };
5181 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops));
5185 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl,
5186 EVT VT1, EVT VT2, SDValue Op1, SDValue Op2) {
5187 SDVTList VTs = getVTList(VT1, VT2);
5188 SDValue Ops[] = { Op1, Op2 };
5189 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops));
5193 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl,
5194 EVT VT1, EVT VT2, SDValue Op1,
5195 SDValue Op2, SDValue Op3) {
5196 SDVTList VTs = getVTList(VT1, VT2);
5197 SDValue Ops[] = { Op1, Op2, Op3 };
5198 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops));
5202 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl,
5204 const SDValue *Ops, unsigned NumOps) {
5205 SDVTList VTs = getVTList(VT1, VT2);
5206 return getMachineNode(Opcode, dl, VTs, Ops, NumOps);
5210 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl,
5211 EVT VT1, EVT VT2, EVT VT3,
5212 SDValue Op1, SDValue Op2) {
5213 SDVTList VTs = getVTList(VT1, VT2, VT3);
5214 SDValue Ops[] = { Op1, Op2 };
5215 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops));
5219 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl,
5220 EVT VT1, EVT VT2, EVT VT3,
5221 SDValue Op1, SDValue Op2, SDValue Op3) {
5222 SDVTList VTs = getVTList(VT1, VT2, VT3);
5223 SDValue Ops[] = { Op1, Op2, Op3 };
5224 return getMachineNode(Opcode, dl, VTs, Ops, array_lengthof(Ops));
5228 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl,
5229 EVT VT1, EVT VT2, EVT VT3,
5230 const SDValue *Ops, unsigned NumOps) {
5231 SDVTList VTs = getVTList(VT1, VT2, VT3);
5232 return getMachineNode(Opcode, dl, VTs, Ops, NumOps);
5236 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl, EVT VT1,
5237 EVT VT2, EVT VT3, EVT VT4,
5238 const SDValue *Ops, unsigned NumOps) {
5239 SDVTList VTs = getVTList(VT1, VT2, VT3, VT4);
5240 return getMachineNode(Opcode, dl, VTs, Ops, NumOps);
5244 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc dl,
5245 const std::vector<EVT> &ResultTys,
5246 const SDValue *Ops, unsigned NumOps) {
5247 SDVTList VTs = getVTList(&ResultTys[0], ResultTys.size());
5248 return getMachineNode(Opcode, dl, VTs, Ops, NumOps);
5252 SelectionDAG::getMachineNode(unsigned Opcode, DebugLoc DL, SDVTList VTs,
5253 const SDValue *Ops, unsigned NumOps) {
5254 bool DoCSE = VTs.VTs[VTs.NumVTs-1] != MVT::Glue;
5259 FoldingSetNodeID ID;
5260 AddNodeIDNode(ID, ~Opcode, VTs, Ops, NumOps);
5262 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP)) {
5263 return cast<MachineSDNode>(UpdadeDebugLocOnMergedSDNode(E, DL));
5267 // Allocate a new MachineSDNode.
5268 N = new (NodeAllocator) MachineSDNode(~Opcode, DL, VTs);
5270 // Initialize the operands list.
5271 if (NumOps > array_lengthof(N->LocalOperands))
5272 // We're creating a final node that will live unmorphed for the
5273 // remainder of the current SelectionDAG iteration, so we can allocate
5274 // the operands directly out of a pool with no recycling metadata.
5275 N->InitOperands(OperandAllocator.Allocate<SDUse>(NumOps),
5278 N->InitOperands(N->LocalOperands, Ops, NumOps);
5279 N->OperandsNeedDelete = false;
5282 CSEMap.InsertNode(N, IP);
5284 AllNodes.push_back(N);
5286 VerifyMachineNode(N);
5291 /// getTargetExtractSubreg - A convenience function for creating
5292 /// TargetOpcode::EXTRACT_SUBREG nodes.
5294 SelectionDAG::getTargetExtractSubreg(int SRIdx, DebugLoc DL, EVT VT,
5296 SDValue SRIdxVal = getTargetConstant(SRIdx, MVT::i32);
5297 SDNode *Subreg = getMachineNode(TargetOpcode::EXTRACT_SUBREG, DL,
5298 VT, Operand, SRIdxVal);
5299 return SDValue(Subreg, 0);
5302 /// getTargetInsertSubreg - A convenience function for creating
5303 /// TargetOpcode::INSERT_SUBREG nodes.
5305 SelectionDAG::getTargetInsertSubreg(int SRIdx, DebugLoc DL, EVT VT,
5306 SDValue Operand, SDValue Subreg) {
5307 SDValue SRIdxVal = getTargetConstant(SRIdx, MVT::i32);
5308 SDNode *Result = getMachineNode(TargetOpcode::INSERT_SUBREG, DL,
5309 VT, Operand, Subreg, SRIdxVal);
5310 return SDValue(Result, 0);
5313 /// getNodeIfExists - Get the specified node if it's already available, or
5314 /// else return NULL.
5315 SDNode *SelectionDAG::getNodeIfExists(unsigned Opcode, SDVTList VTList,
5316 const SDValue *Ops, unsigned NumOps) {
5317 if (VTList.VTs[VTList.NumVTs-1] != MVT::Glue) {
5318 FoldingSetNodeID ID;
5319 AddNodeIDNode(ID, Opcode, VTList, Ops, NumOps);
5321 if (SDNode *E = CSEMap.FindNodeOrInsertPos(ID, IP))
5327 /// getDbgValue - Creates a SDDbgValue node.
5330 SelectionDAG::getDbgValue(MDNode *MDPtr, SDNode *N, unsigned R, uint64_t Off,
5331 DebugLoc DL, unsigned O) {
5332 return new (Allocator) SDDbgValue(MDPtr, N, R, Off, DL, O);
5336 SelectionDAG::getDbgValue(MDNode *MDPtr, const Value *C, uint64_t Off,
5337 DebugLoc DL, unsigned O) {
5338 return new (Allocator) SDDbgValue(MDPtr, C, Off, DL, O);
5342 SelectionDAG::getDbgValue(MDNode *MDPtr, unsigned FI, uint64_t Off,
5343 DebugLoc DL, unsigned O) {
5344 return new (Allocator) SDDbgValue(MDPtr, FI, Off, DL, O);
5349 /// RAUWUpdateListener - Helper for ReplaceAllUsesWith - When the node
5350 /// pointed to by a use iterator is deleted, increment the use iterator
5351 /// so that it doesn't dangle.
5353 class RAUWUpdateListener : public SelectionDAG::DAGUpdateListener {
5354 SDNode::use_iterator &UI;
5355 SDNode::use_iterator &UE;
5357 virtual void NodeDeleted(SDNode *N, SDNode *E) {
5358 // Increment the iterator as needed.
5359 while (UI != UE && N == *UI)
5364 RAUWUpdateListener(SelectionDAG &d,
5365 SDNode::use_iterator &ui,
5366 SDNode::use_iterator &ue)
5367 : SelectionDAG::DAGUpdateListener(d), UI(ui), UE(ue) {}
5372 /// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead.
5373 /// This can cause recursive merging of nodes in the DAG.
5375 /// This version assumes From has a single result value.
5377 void SelectionDAG::ReplaceAllUsesWith(SDValue FromN, SDValue To) {
5378 SDNode *From = FromN.getNode();
5379 assert(From->getNumValues() == 1 && FromN.getResNo() == 0 &&
5380 "Cannot replace with this method!");
5381 assert(From != To.getNode() && "Cannot replace uses of with self");
5383 // Iterate over all the existing uses of From. New uses will be added
5384 // to the beginning of the use list, which we avoid visiting.
5385 // This specifically avoids visiting uses of From that arise while the
5386 // replacement is happening, because any such uses would be the result
5387 // of CSE: If an existing node looks like From after one of its operands
5388 // is replaced by To, we don't want to replace of all its users with To
5389 // too. See PR3018 for more info.
5390 SDNode::use_iterator UI = From->use_begin(), UE = From->use_end();
5391 RAUWUpdateListener Listener(*this, UI, UE);
5395 // This node is about to morph, remove its old self from the CSE maps.
5396 RemoveNodeFromCSEMaps(User);
5398 // A user can appear in a use list multiple times, and when this
5399 // happens the uses are usually next to each other in the list.
5400 // To help reduce the number of CSE recomputations, process all
5401 // the uses of this user that we can find this way.
5403 SDUse &Use = UI.getUse();
5406 } while (UI != UE && *UI == User);
5408 // Now that we have modified User, add it back to the CSE maps. If it
5409 // already exists there, recursively merge the results together.
5410 AddModifiedNodeToCSEMaps(User);
5413 // If we just RAUW'd the root, take note.
5414 if (FromN == getRoot())
5418 /// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead.
5419 /// This can cause recursive merging of nodes in the DAG.
5421 /// This version assumes that for each value of From, there is a
5422 /// corresponding value in To in the same position with the same type.
5424 void SelectionDAG::ReplaceAllUsesWith(SDNode *From, SDNode *To) {
5426 for (unsigned i = 0, e = From->getNumValues(); i != e; ++i)
5427 assert((!From->hasAnyUseOfValue(i) ||
5428 From->getValueType(i) == To->getValueType(i)) &&
5429 "Cannot use this version of ReplaceAllUsesWith!");
5432 // Handle the trivial case.
5436 // Iterate over just the existing users of From. See the comments in
5437 // the ReplaceAllUsesWith above.
5438 SDNode::use_iterator UI = From->use_begin(), UE = From->use_end();
5439 RAUWUpdateListener Listener(*this, UI, UE);
5443 // This node is about to morph, remove its old self from the CSE maps.
5444 RemoveNodeFromCSEMaps(User);
5446 // A user can appear in a use list multiple times, and when this
5447 // happens the uses are usually next to each other in the list.
5448 // To help reduce the number of CSE recomputations, process all
5449 // the uses of this user that we can find this way.
5451 SDUse &Use = UI.getUse();
5454 } while (UI != UE && *UI == User);
5456 // Now that we have modified User, add it back to the CSE maps. If it
5457 // already exists there, recursively merge the results together.
5458 AddModifiedNodeToCSEMaps(User);
5461 // If we just RAUW'd the root, take note.
5462 if (From == getRoot().getNode())
5463 setRoot(SDValue(To, getRoot().getResNo()));
5466 /// ReplaceAllUsesWith - Modify anything using 'From' to use 'To' instead.
5467 /// This can cause recursive merging of nodes in the DAG.
5469 /// This version can replace From with any result values. To must match the
5470 /// number and types of values returned by From.
5471 void SelectionDAG::ReplaceAllUsesWith(SDNode *From, const SDValue *To) {
5472 if (From->getNumValues() == 1) // Handle the simple case efficiently.
5473 return ReplaceAllUsesWith(SDValue(From, 0), To[0]);
5475 // Iterate over just the existing users of From. See the comments in
5476 // the ReplaceAllUsesWith above.
5477 SDNode::use_iterator UI = From->use_begin(), UE = From->use_end();
5478 RAUWUpdateListener Listener(*this, UI, UE);
5482 // This node is about to morph, remove its old self from the CSE maps.
5483 RemoveNodeFromCSEMaps(User);
5485 // A user can appear in a use list multiple times, and when this
5486 // happens the uses are usually next to each other in the list.
5487 // To help reduce the number of CSE recomputations, process all
5488 // the uses of this user that we can find this way.
5490 SDUse &Use = UI.getUse();
5491 const SDValue &ToOp = To[Use.getResNo()];
5494 } while (UI != UE && *UI == User);
5496 // Now that we have modified User, add it back to the CSE maps. If it
5497 // already exists there, recursively merge the results together.
5498 AddModifiedNodeToCSEMaps(User);
5501 // If we just RAUW'd the root, take note.
5502 if (From == getRoot().getNode())
5503 setRoot(SDValue(To[getRoot().getResNo()]));
5506 /// ReplaceAllUsesOfValueWith - Replace any uses of From with To, leaving
5507 /// uses of other values produced by From.getNode() alone. The Deleted
5508 /// vector is handled the same way as for ReplaceAllUsesWith.
5509 void SelectionDAG::ReplaceAllUsesOfValueWith(SDValue From, SDValue To){
5510 // Handle the really simple, really trivial case efficiently.
5511 if (From == To) return;
5513 // Handle the simple, trivial, case efficiently.
5514 if (From.getNode()->getNumValues() == 1) {
5515 ReplaceAllUsesWith(From, To);
5519 // Iterate over just the existing users of From. See the comments in
5520 // the ReplaceAllUsesWith above.
5521 SDNode::use_iterator UI = From.getNode()->use_begin(),
5522 UE = From.getNode()->use_end();
5523 RAUWUpdateListener Listener(*this, UI, UE);
5526 bool UserRemovedFromCSEMaps = false;
5528 // A user can appear in a use list multiple times, and when this
5529 // happens the uses are usually next to each other in the list.
5530 // To help reduce the number of CSE recomputations, process all
5531 // the uses of this user that we can find this way.
5533 SDUse &Use = UI.getUse();
5535 // Skip uses of different values from the same node.
5536 if (Use.getResNo() != From.getResNo()) {
5541 // If this node hasn't been modified yet, it's still in the CSE maps,
5542 // so remove its old self from the CSE maps.
5543 if (!UserRemovedFromCSEMaps) {
5544 RemoveNodeFromCSEMaps(User);
5545 UserRemovedFromCSEMaps = true;
5550 } while (UI != UE && *UI == User);
5552 // We are iterating over all uses of the From node, so if a use
5553 // doesn't use the specific value, no changes are made.
5554 if (!UserRemovedFromCSEMaps)
5557 // Now that we have modified User, add it back to the CSE maps. If it
5558 // already exists there, recursively merge the results together.
5559 AddModifiedNodeToCSEMaps(User);
5562 // If we just RAUW'd the root, take note.
5563 if (From == getRoot())
5568 /// UseMemo - This class is used by SelectionDAG::ReplaceAllUsesOfValuesWith
5569 /// to record information about a use.
5576 /// operator< - Sort Memos by User.
5577 bool operator<(const UseMemo &L, const UseMemo &R) {
5578 return (intptr_t)L.User < (intptr_t)R.User;
5582 /// ReplaceAllUsesOfValuesWith - Replace any uses of From with To, leaving
5583 /// uses of other values produced by From.getNode() alone. The same value
5584 /// may appear in both the From and To list. The Deleted vector is
5585 /// handled the same way as for ReplaceAllUsesWith.
5586 void SelectionDAG::ReplaceAllUsesOfValuesWith(const SDValue *From,
5589 // Handle the simple, trivial case efficiently.
5591 return ReplaceAllUsesOfValueWith(*From, *To);
5593 // Read up all the uses and make records of them. This helps
5594 // processing new uses that are introduced during the
5595 // replacement process.
5596 SmallVector<UseMemo, 4> Uses;
5597 for (unsigned i = 0; i != Num; ++i) {
5598 unsigned FromResNo = From[i].getResNo();
5599 SDNode *FromNode = From[i].getNode();
5600 for (SDNode::use_iterator UI = FromNode->use_begin(),
5601 E = FromNode->use_end(); UI != E; ++UI) {
5602 SDUse &Use = UI.getUse();
5603 if (Use.getResNo() == FromResNo) {
5604 UseMemo Memo = { *UI, i, &Use };
5605 Uses.push_back(Memo);
5610 // Sort the uses, so that all the uses from a given User are together.
5611 std::sort(Uses.begin(), Uses.end());
5613 for (unsigned UseIndex = 0, UseIndexEnd = Uses.size();
5614 UseIndex != UseIndexEnd; ) {
5615 // We know that this user uses some value of From. If it is the right
5616 // value, update it.
5617 SDNode *User = Uses[UseIndex].User;
5619 // This node is about to morph, remove its old self from the CSE maps.
5620 RemoveNodeFromCSEMaps(User);
5622 // The Uses array is sorted, so all the uses for a given User
5623 // are next to each other in the list.
5624 // To help reduce the number of CSE recomputations, process all
5625 // the uses of this user that we can find this way.
5627 unsigned i = Uses[UseIndex].Index;
5628 SDUse &Use = *Uses[UseIndex].Use;
5632 } while (UseIndex != UseIndexEnd && Uses[UseIndex].User == User);
5634 // Now that we have modified User, add it back to the CSE maps. If it
5635 // already exists there, recursively merge the results together.
5636 AddModifiedNodeToCSEMaps(User);
5640 /// AssignTopologicalOrder - Assign a unique node id for each node in the DAG
5641 /// based on their topological order. It returns the maximum id and a vector
5642 /// of the SDNodes* in assigned order by reference.
5643 unsigned SelectionDAG::AssignTopologicalOrder() {
5645 unsigned DAGSize = 0;
5647 // SortedPos tracks the progress of the algorithm. Nodes before it are
5648 // sorted, nodes after it are unsorted. When the algorithm completes
5649 // it is at the end of the list.
5650 allnodes_iterator SortedPos = allnodes_begin();
5652 // Visit all the nodes. Move nodes with no operands to the front of
5653 // the list immediately. Annotate nodes that do have operands with their
5654 // operand count. Before we do this, the Node Id fields of the nodes
5655 // may contain arbitrary values. After, the Node Id fields for nodes
5656 // before SortedPos will contain the topological sort index, and the
5657 // Node Id fields for nodes At SortedPos and after will contain the
5658 // count of outstanding operands.
5659 for (allnodes_iterator I = allnodes_begin(),E = allnodes_end(); I != E; ) {
5662 unsigned Degree = N->getNumOperands();
5664 // A node with no uses, add it to the result array immediately.
5665 N->setNodeId(DAGSize++);
5666 allnodes_iterator Q = N;
5668 SortedPos = AllNodes.insert(SortedPos, AllNodes.remove(Q));
5669 assert(SortedPos != AllNodes.end() && "Overran node list");
5672 // Temporarily use the Node Id as scratch space for the degree count.
5673 N->setNodeId(Degree);
5677 // Visit all the nodes. As we iterate, move nodes into sorted order,
5678 // such that by the time the end is reached all nodes will be sorted.
5679 for (allnodes_iterator I = allnodes_begin(),E = allnodes_end(); I != E; ++I) {
5682 // N is in sorted position, so all its uses have one less operand
5683 // that needs to be sorted.
5684 for (SDNode::use_iterator UI = N->use_begin(), UE = N->use_end();
5687 unsigned Degree = P->getNodeId();
5688 assert(Degree != 0 && "Invalid node degree");
5691 // All of P's operands are sorted, so P may sorted now.
5692 P->setNodeId(DAGSize++);
5694 SortedPos = AllNodes.insert(SortedPos, AllNodes.remove(P));
5695 assert(SortedPos != AllNodes.end() && "Overran node list");
5698 // Update P's outstanding operand count.
5699 P->setNodeId(Degree);
5702 if (I == SortedPos) {
5705 dbgs() << "Overran sorted position:\n";
5708 llvm_unreachable(0);
5712 assert(SortedPos == AllNodes.end() &&
5713 "Topological sort incomplete!");
5714 assert(AllNodes.front().getOpcode() == ISD::EntryToken &&
5715 "First node in topological sort is not the entry token!");
5716 assert(AllNodes.front().getNodeId() == 0 &&
5717 "First node in topological sort has non-zero id!");
5718 assert(AllNodes.front().getNumOperands() == 0 &&
5719 "First node in topological sort has operands!");
5720 assert(AllNodes.back().getNodeId() == (int)DAGSize-1 &&
5721 "Last node in topologic sort has unexpected id!");
5722 assert(AllNodes.back().use_empty() &&
5723 "Last node in topologic sort has users!");
5724 assert(DAGSize == allnodes_size() && "Node count mismatch!");
5728 /// AssignOrdering - Assign an order to the SDNode.
5729 void SelectionDAG::AssignOrdering(const SDNode *SD, unsigned Order) {
5730 assert(SD && "Trying to assign an order to a null node!");
5731 Ordering->add(SD, Order);
5734 /// GetOrdering - Get the order for the SDNode.
5735 unsigned SelectionDAG::GetOrdering(const SDNode *SD) const {
5736 assert(SD && "Trying to get the order of a null node!");
5737 return Ordering->getOrder(SD);
5740 /// AddDbgValue - Add a dbg_value SDNode. If SD is non-null that means the
5741 /// value is produced by SD.
5742 void SelectionDAG::AddDbgValue(SDDbgValue *DB, SDNode *SD, bool isParameter) {
5743 DbgInfo->add(DB, SD, isParameter);
5745 SD->setHasDebugValue(true);
5748 /// TransferDbgValues - Transfer SDDbgValues.
5749 void SelectionDAG::TransferDbgValues(SDValue From, SDValue To) {
5750 if (From == To || !From.getNode()->getHasDebugValue())
5752 SDNode *FromNode = From.getNode();
5753 SDNode *ToNode = To.getNode();
5754 ArrayRef<SDDbgValue *> DVs = GetDbgValues(FromNode);
5755 SmallVector<SDDbgValue *, 2> ClonedDVs;
5756 for (ArrayRef<SDDbgValue *>::iterator I = DVs.begin(), E = DVs.end();
5758 SDDbgValue *Dbg = *I;
5759 if (Dbg->getKind() == SDDbgValue::SDNODE) {
5760 SDDbgValue *Clone = getDbgValue(Dbg->getMDPtr(), ToNode, To.getResNo(),
5761 Dbg->getOffset(), Dbg->getDebugLoc(),
5763 ClonedDVs.push_back(Clone);
5766 for (SmallVector<SDDbgValue *, 2>::iterator I = ClonedDVs.begin(),
5767 E = ClonedDVs.end(); I != E; ++I)
5768 AddDbgValue(*I, ToNode, false);
5771 //===----------------------------------------------------------------------===//
5773 //===----------------------------------------------------------------------===//
5775 HandleSDNode::~HandleSDNode() {
5779 GlobalAddressSDNode::GlobalAddressSDNode(unsigned Opc, DebugLoc DL,
5780 const GlobalValue *GA,
5781 EVT VT, int64_t o, unsigned char TF)
5782 : SDNode(Opc, DL, getSDVTList(VT)), Offset(o), TargetFlags(TF) {
5786 MemSDNode::MemSDNode(unsigned Opc, DebugLoc dl, SDVTList VTs, EVT memvt,
5787 MachineMemOperand *mmo)
5788 : SDNode(Opc, dl, VTs), MemoryVT(memvt), MMO(mmo) {
5789 SubclassData = encodeMemSDNodeFlags(0, ISD::UNINDEXED, MMO->isVolatile(),
5790 MMO->isNonTemporal(), MMO->isInvariant());
5791 assert(isVolatile() == MMO->isVolatile() && "Volatile encoding error!");
5792 assert(isNonTemporal() == MMO->isNonTemporal() &&
5793 "Non-temporal encoding error!");
5794 assert(memvt.getStoreSize() == MMO->getSize() && "Size mismatch!");
5797 MemSDNode::MemSDNode(unsigned Opc, DebugLoc dl, SDVTList VTs,
5798 const SDValue *Ops, unsigned NumOps, EVT memvt,
5799 MachineMemOperand *mmo)
5800 : SDNode(Opc, dl, VTs, Ops, NumOps),
5801 MemoryVT(memvt), MMO(mmo) {
5802 SubclassData = encodeMemSDNodeFlags(0, ISD::UNINDEXED, MMO->isVolatile(),
5803 MMO->isNonTemporal(), MMO->isInvariant());
5804 assert(isVolatile() == MMO->isVolatile() && "Volatile encoding error!");
5805 assert(memvt.getStoreSize() == MMO->getSize() && "Size mismatch!");
5808 /// Profile - Gather unique data for the node.
5810 void SDNode::Profile(FoldingSetNodeID &ID) const {
5811 AddNodeIDNode(ID, this);
5816 std::vector<EVT> VTs;
5819 VTs.reserve(MVT::LAST_VALUETYPE);
5820 for (unsigned i = 0; i < MVT::LAST_VALUETYPE; ++i)
5821 VTs.push_back(MVT((MVT::SimpleValueType)i));
5826 static ManagedStatic<std::set<EVT, EVT::compareRawBits> > EVTs;
5827 static ManagedStatic<EVTArray> SimpleVTArray;
5828 static ManagedStatic<sys::SmartMutex<true> > VTMutex;
5830 /// getValueTypeList - Return a pointer to the specified value type.
5832 const EVT *SDNode::getValueTypeList(EVT VT) {
5833 if (VT.isExtended()) {
5834 sys::SmartScopedLock<true> Lock(*VTMutex);
5835 return &(*EVTs->insert(VT).first);
5837 assert(VT.getSimpleVT() < MVT::LAST_VALUETYPE &&
5838 "Value type out of range!");
5839 return &SimpleVTArray->VTs[VT.getSimpleVT().SimpleTy];
5843 /// hasNUsesOfValue - Return true if there are exactly NUSES uses of the
5844 /// indicated value. This method ignores uses of other values defined by this
5846 bool SDNode::hasNUsesOfValue(unsigned NUses, unsigned Value) const {
5847 assert(Value < getNumValues() && "Bad value!");
5849 // TODO: Only iterate over uses of a given value of the node
5850 for (SDNode::use_iterator UI = use_begin(), E = use_end(); UI != E; ++UI) {
5851 if (UI.getUse().getResNo() == Value) {
5858 // Found exactly the right number of uses?
5863 /// hasAnyUseOfValue - Return true if there are any use of the indicated
5864 /// value. This method ignores uses of other values defined by this operation.
5865 bool SDNode::hasAnyUseOfValue(unsigned Value) const {
5866 assert(Value < getNumValues() && "Bad value!");
5868 for (SDNode::use_iterator UI = use_begin(), E = use_end(); UI != E; ++UI)
5869 if (UI.getUse().getResNo() == Value)
5876 /// isOnlyUserOf - Return true if this node is the only use of N.
5878 bool SDNode::isOnlyUserOf(SDNode *N) const {
5880 for (SDNode::use_iterator I = N->use_begin(), E = N->use_end(); I != E; ++I) {
5891 /// isOperand - Return true if this node is an operand of N.
5893 bool SDValue::isOperandOf(SDNode *N) const {
5894 for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i)
5895 if (*this == N->getOperand(i))
5900 bool SDNode::isOperandOf(SDNode *N) const {
5901 for (unsigned i = 0, e = N->NumOperands; i != e; ++i)
5902 if (this == N->OperandList[i].getNode())
5907 /// reachesChainWithoutSideEffects - Return true if this operand (which must
5908 /// be a chain) reaches the specified operand without crossing any
5909 /// side-effecting instructions on any chain path. In practice, this looks
5910 /// through token factors and non-volatile loads. In order to remain efficient,
5911 /// this only looks a couple of nodes in, it does not do an exhaustive search.
5912 bool SDValue::reachesChainWithoutSideEffects(SDValue Dest,
5913 unsigned Depth) const {
5914 if (*this == Dest) return true;
5916 // Don't search too deeply, we just want to be able to see through
5917 // TokenFactor's etc.
5918 if (Depth == 0) return false;
5920 // If this is a token factor, all inputs to the TF happen in parallel. If any
5921 // of the operands of the TF does not reach dest, then we cannot do the xform.
5922 if (getOpcode() == ISD::TokenFactor) {
5923 for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
5924 if (!getOperand(i).reachesChainWithoutSideEffects(Dest, Depth-1))
5929 // Loads don't have side effects, look through them.
5930 if (LoadSDNode *Ld = dyn_cast<LoadSDNode>(*this)) {
5931 if (!Ld->isVolatile())
5932 return Ld->getChain().reachesChainWithoutSideEffects(Dest, Depth-1);
5937 /// hasPredecessor - Return true if N is a predecessor of this node.
5938 /// N is either an operand of this node, or can be reached by recursively
5939 /// traversing up the operands.
5940 /// NOTE: This is an expensive method. Use it carefully.
5941 bool SDNode::hasPredecessor(const SDNode *N) const {
5942 SmallPtrSet<const SDNode *, 32> Visited;
5943 SmallVector<const SDNode *, 16> Worklist;
5944 return hasPredecessorHelper(N, Visited, Worklist);
5947 bool SDNode::hasPredecessorHelper(const SDNode *N,
5948 SmallPtrSet<const SDNode *, 32> &Visited,
5949 SmallVector<const SDNode *, 16> &Worklist) const {
5950 if (Visited.empty()) {
5951 Worklist.push_back(this);
5953 // Take a look in the visited set. If we've already encountered this node
5954 // we needn't search further.
5955 if (Visited.count(N))
5959 // Haven't visited N yet. Continue the search.
5960 while (!Worklist.empty()) {
5961 const SDNode *M = Worklist.pop_back_val();
5962 for (unsigned i = 0, e = M->getNumOperands(); i != e; ++i) {
5963 SDNode *Op = M->getOperand(i).getNode();
5964 if (Visited.insert(Op))
5965 Worklist.push_back(Op);
5974 uint64_t SDNode::getConstantOperandVal(unsigned Num) const {
5975 assert(Num < NumOperands && "Invalid child # of SDNode!");
5976 return cast<ConstantSDNode>(OperandList[Num])->getZExtValue();
5979 SDValue SelectionDAG::UnrollVectorOp(SDNode *N, unsigned ResNE) {
5980 assert(N->getNumValues() == 1 &&
5981 "Can't unroll a vector with multiple results!");
5983 EVT VT = N->getValueType(0);
5984 unsigned NE = VT.getVectorNumElements();
5985 EVT EltVT = VT.getVectorElementType();
5986 DebugLoc dl = N->getDebugLoc();
5988 SmallVector<SDValue, 8> Scalars;
5989 SmallVector<SDValue, 4> Operands(N->getNumOperands());
5991 // If ResNE is 0, fully unroll the vector op.
5994 else if (NE > ResNE)
5998 for (i= 0; i != NE; ++i) {
5999 for (unsigned j = 0, e = N->getNumOperands(); j != e; ++j) {
6000 SDValue Operand = N->getOperand(j);
6001 EVT OperandVT = Operand.getValueType();
6002 if (OperandVT.isVector()) {
6003 // A vector operand; extract a single element.
6004 EVT OperandEltVT = OperandVT.getVectorElementType();
6005 Operands[j] = getNode(ISD::EXTRACT_VECTOR_ELT, dl,
6008 getConstant(i, TLI.getPointerTy()));
6010 // A scalar operand; just use it as is.
6011 Operands[j] = Operand;
6015 switch (N->getOpcode()) {
6017 Scalars.push_back(getNode(N->getOpcode(), dl, EltVT,
6018 &Operands[0], Operands.size()));
6021 Scalars.push_back(getNode(ISD::SELECT, dl, EltVT,
6022 &Operands[0], Operands.size()));
6029 Scalars.push_back(getNode(N->getOpcode(), dl, EltVT, Operands[0],
6030 getShiftAmountOperand(Operands[0].getValueType(),
6033 case ISD::SIGN_EXTEND_INREG:
6034 case ISD::FP_ROUND_INREG: {
6035 EVT ExtVT = cast<VTSDNode>(Operands[1])->getVT().getVectorElementType();
6036 Scalars.push_back(getNode(N->getOpcode(), dl, EltVT,
6038 getValueType(ExtVT)));
6043 for (; i < ResNE; ++i)
6044 Scalars.push_back(getUNDEF(EltVT));
6046 return getNode(ISD::BUILD_VECTOR, dl,
6047 EVT::getVectorVT(*getContext(), EltVT, ResNE),
6048 &Scalars[0], Scalars.size());
6052 /// isConsecutiveLoad - Return true if LD is loading 'Bytes' bytes from a
6053 /// location that is 'Dist' units away from the location that the 'Base' load
6054 /// is loading from.
6055 bool SelectionDAG::isConsecutiveLoad(LoadSDNode *LD, LoadSDNode *Base,
6056 unsigned Bytes, int Dist) const {
6057 if (LD->getChain() != Base->getChain())
6059 EVT VT = LD->getValueType(0);
6060 if (VT.getSizeInBits() / 8 != Bytes)
6063 SDValue Loc = LD->getOperand(1);
6064 SDValue BaseLoc = Base->getOperand(1);
6065 if (Loc.getOpcode() == ISD::FrameIndex) {
6066 if (BaseLoc.getOpcode() != ISD::FrameIndex)
6068 const MachineFrameInfo *MFI = getMachineFunction().getFrameInfo();
6069 int FI = cast<FrameIndexSDNode>(Loc)->getIndex();
6070 int BFI = cast<FrameIndexSDNode>(BaseLoc)->getIndex();
6071 int FS = MFI->getObjectSize(FI);
6072 int BFS = MFI->getObjectSize(BFI);
6073 if (FS != BFS || FS != (int)Bytes) return false;
6074 return MFI->getObjectOffset(FI) == (MFI->getObjectOffset(BFI) + Dist*Bytes);
6078 if (isBaseWithConstantOffset(Loc) && Loc.getOperand(0) == BaseLoc &&
6079 cast<ConstantSDNode>(Loc.getOperand(1))->getSExtValue() == Dist*Bytes)
6082 const GlobalValue *GV1 = NULL;
6083 const GlobalValue *GV2 = NULL;
6084 int64_t Offset1 = 0;
6085 int64_t Offset2 = 0;
6086 bool isGA1 = TLI.isGAPlusOffset(Loc.getNode(), GV1, Offset1);
6087 bool isGA2 = TLI.isGAPlusOffset(BaseLoc.getNode(), GV2, Offset2);
6088 if (isGA1 && isGA2 && GV1 == GV2)
6089 return Offset1 == (Offset2 + Dist*Bytes);
6094 /// InferPtrAlignment - Infer alignment of a load / store address. Return 0 if
6095 /// it cannot be inferred.
6096 unsigned SelectionDAG::InferPtrAlignment(SDValue Ptr) const {
6097 // If this is a GlobalAddress + cst, return the alignment.
6098 const GlobalValue *GV;
6099 int64_t GVOffset = 0;
6100 if (TLI.isGAPlusOffset(Ptr.getNode(), GV, GVOffset)) {
6101 unsigned PtrWidth = TLI.getPointerTy().getSizeInBits();
6102 APInt KnownZero(PtrWidth, 0), KnownOne(PtrWidth, 0);
6103 llvm::ComputeMaskedBits(const_cast<GlobalValue*>(GV), KnownZero, KnownOne,
6104 TLI.getDataLayout());
6105 unsigned AlignBits = KnownZero.countTrailingOnes();
6106 unsigned Align = AlignBits ? 1 << std::min(31U, AlignBits) : 0;
6108 return MinAlign(Align, GVOffset);
6111 // If this is a direct reference to a stack slot, use information about the
6112 // stack slot's alignment.
6113 int FrameIdx = 1 << 31;
6114 int64_t FrameOffset = 0;
6115 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Ptr)) {
6116 FrameIdx = FI->getIndex();
6117 } else if (isBaseWithConstantOffset(Ptr) &&
6118 isa<FrameIndexSDNode>(Ptr.getOperand(0))) {
6120 FrameIdx = cast<FrameIndexSDNode>(Ptr.getOperand(0))->getIndex();
6121 FrameOffset = Ptr.getConstantOperandVal(1);
6124 if (FrameIdx != (1 << 31)) {
6125 const MachineFrameInfo &MFI = *getMachineFunction().getFrameInfo();
6126 unsigned FIInfoAlign = MinAlign(MFI.getObjectAlignment(FrameIdx),
6134 // getAddressSpace - Return the address space this GlobalAddress belongs to.
6135 unsigned GlobalAddressSDNode::getAddressSpace() const {
6136 return getGlobal()->getType()->getAddressSpace();
6140 Type *ConstantPoolSDNode::getType() const {
6141 if (isMachineConstantPoolEntry())
6142 return Val.MachineCPVal->getType();
6143 return Val.ConstVal->getType();
6146 bool BuildVectorSDNode::isConstantSplat(APInt &SplatValue,
6148 unsigned &SplatBitSize,
6150 unsigned MinSplatBits,
6152 EVT VT = getValueType(0);
6153 assert(VT.isVector() && "Expected a vector type");
6154 unsigned sz = VT.getSizeInBits();
6155 if (MinSplatBits > sz)
6158 SplatValue = APInt(sz, 0);
6159 SplatUndef = APInt(sz, 0);
6161 // Get the bits. Bits with undefined values (when the corresponding element
6162 // of the vector is an ISD::UNDEF value) are set in SplatUndef and cleared
6163 // in SplatValue. If any of the values are not constant, give up and return
6165 unsigned int nOps = getNumOperands();
6166 assert(nOps > 0 && "isConstantSplat has 0-size build vector");
6167 unsigned EltBitSize = VT.getVectorElementType().getSizeInBits();
6169 for (unsigned j = 0; j < nOps; ++j) {
6170 unsigned i = isBigEndian ? nOps-1-j : j;
6171 SDValue OpVal = getOperand(i);
6172 unsigned BitPos = j * EltBitSize;
6174 if (OpVal.getOpcode() == ISD::UNDEF)
6175 SplatUndef |= APInt::getBitsSet(sz, BitPos, BitPos + EltBitSize);
6176 else if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(OpVal))
6177 SplatValue |= CN->getAPIntValue().zextOrTrunc(EltBitSize).
6178 zextOrTrunc(sz) << BitPos;
6179 else if (ConstantFPSDNode *CN = dyn_cast<ConstantFPSDNode>(OpVal))
6180 SplatValue |= CN->getValueAPF().bitcastToAPInt().zextOrTrunc(sz) <<BitPos;
6185 // The build_vector is all constants or undefs. Find the smallest element
6186 // size that splats the vector.
6188 HasAnyUndefs = (SplatUndef != 0);
6191 unsigned HalfSize = sz / 2;
6192 APInt HighValue = SplatValue.lshr(HalfSize).trunc(HalfSize);
6193 APInt LowValue = SplatValue.trunc(HalfSize);
6194 APInt HighUndef = SplatUndef.lshr(HalfSize).trunc(HalfSize);
6195 APInt LowUndef = SplatUndef.trunc(HalfSize);
6197 // If the two halves do not match (ignoring undef bits), stop here.
6198 if ((HighValue & ~LowUndef) != (LowValue & ~HighUndef) ||
6199 MinSplatBits > HalfSize)
6202 SplatValue = HighValue | LowValue;
6203 SplatUndef = HighUndef & LowUndef;
6212 bool ShuffleVectorSDNode::isSplatMask(const int *Mask, EVT VT) {
6213 // Find the first non-undef value in the shuffle mask.
6215 for (i = 0, e = VT.getVectorNumElements(); i != e && Mask[i] < 0; ++i)
6218 assert(i != e && "VECTOR_SHUFFLE node with all undef indices!");
6220 // Make sure all remaining elements are either undef or the same as the first
6222 for (int Idx = Mask[i]; i != e; ++i)
6223 if (Mask[i] >= 0 && Mask[i] != Idx)
6229 static void checkForCyclesHelper(const SDNode *N,
6230 SmallPtrSet<const SDNode*, 32> &Visited,
6231 SmallPtrSet<const SDNode*, 32> &Checked) {
6232 // If this node has already been checked, don't check it again.
6233 if (Checked.count(N))
6236 // If a node has already been visited on this depth-first walk, reject it as
6238 if (!Visited.insert(N)) {
6239 dbgs() << "Offending node:\n";
6241 errs() << "Detected cycle in SelectionDAG\n";
6245 for(unsigned i = 0, e = N->getNumOperands(); i != e; ++i)
6246 checkForCyclesHelper(N->getOperand(i).getNode(), Visited, Checked);
6253 void llvm::checkForCycles(const llvm::SDNode *N) {
6255 assert(N && "Checking nonexistant SDNode");
6256 SmallPtrSet<const SDNode*, 32> visited;
6257 SmallPtrSet<const SDNode*, 32> checked;
6258 checkForCyclesHelper(N, visited, checked);
6262 void llvm::checkForCycles(const llvm::SelectionDAG *DAG) {
6263 checkForCycles(DAG->getRoot().getNode());