1 //===-- LegalizeDAG.cpp - Implement SelectionDAG::Legalize ----------------===//
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 file implements the SelectionDAG::Legalize method.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/Analysis/DebugInfo.h"
15 #include "llvm/CodeGen/Analysis.h"
16 #include "llvm/CodeGen/MachineFunction.h"
17 #include "llvm/CodeGen/MachineJumpTableInfo.h"
18 #include "llvm/CodeGen/SelectionDAG.h"
19 #include "llvm/Target/TargetFrameLowering.h"
20 #include "llvm/Target/TargetLowering.h"
21 #include "llvm/Target/TargetData.h"
22 #include "llvm/Target/TargetMachine.h"
23 #include "llvm/CallingConv.h"
24 #include "llvm/Constants.h"
25 #include "llvm/DerivedTypes.h"
26 #include "llvm/LLVMContext.h"
27 #include "llvm/Support/Debug.h"
28 #include "llvm/Support/ErrorHandling.h"
29 #include "llvm/Support/MathExtras.h"
30 #include "llvm/Support/raw_ostream.h"
31 #include "llvm/ADT/DenseMap.h"
32 #include "llvm/ADT/SmallVector.h"
33 #include "llvm/ADT/SmallPtrSet.h"
36 //===----------------------------------------------------------------------===//
37 /// SelectionDAGLegalize - This takes an arbitrary SelectionDAG as input and
38 /// hacks on it until the target machine can handle it. This involves
39 /// eliminating value sizes the machine cannot handle (promoting small sizes to
40 /// large sizes or splitting up large values into small values) as well as
41 /// eliminating operations the machine cannot handle.
43 /// This code also does a small amount of optimization and recognition of idioms
44 /// as part of its processing. For example, if a target does not support a
45 /// 'setcc' instruction efficiently, but does support 'brcc' instruction, this
46 /// will attempt merge setcc and brc instructions into brcc's.
49 class SelectionDAGLegalize : public SelectionDAG::DAGUpdateListener {
50 const TargetMachine &TM;
51 const TargetLowering &TLI;
54 /// LegalizePosition - The iterator for walking through the node list.
55 SelectionDAG::allnodes_iterator LegalizePosition;
57 /// LegalizedNodes - The set of nodes which have already been legalized.
58 SmallPtrSet<SDNode *, 16> LegalizedNodes;
60 // Libcall insertion helpers.
63 explicit SelectionDAGLegalize(SelectionDAG &DAG);
68 /// LegalizeOp - Legalizes the given operation.
69 void LegalizeOp(SDNode *Node);
71 SDValue OptimizeFloatStore(StoreSDNode *ST);
73 /// PerformInsertVectorEltInMemory - Some target cannot handle a variable
74 /// insertion index for the INSERT_VECTOR_ELT instruction. In this case, it
75 /// is necessary to spill the vector being inserted into to memory, perform
76 /// the insert there, and then read the result back.
77 SDValue PerformInsertVectorEltInMemory(SDValue Vec, SDValue Val,
78 SDValue Idx, DebugLoc dl);
79 SDValue ExpandINSERT_VECTOR_ELT(SDValue Vec, SDValue Val,
80 SDValue Idx, DebugLoc dl);
82 /// ShuffleWithNarrowerEltType - Return a vector shuffle operation which
83 /// performs the same shuffe in terms of order or result bytes, but on a type
84 /// whose vector element type is narrower than the original shuffle type.
85 /// e.g. <v4i32> <0, 1, 0, 1> -> v8i16 <0, 1, 2, 3, 0, 1, 2, 3>
86 SDValue ShuffleWithNarrowerEltType(EVT NVT, EVT VT, DebugLoc dl,
87 SDValue N1, SDValue N2,
88 SmallVectorImpl<int> &Mask) const;
90 void LegalizeSetCCCondCode(EVT VT, SDValue &LHS, SDValue &RHS, SDValue &CC,
93 SDValue ExpandLibCall(RTLIB::Libcall LC, SDNode *Node, bool isSigned);
94 SDValue ExpandLibCall(RTLIB::Libcall LC, EVT RetVT, const SDValue *Ops,
95 unsigned NumOps, bool isSigned, DebugLoc dl);
97 std::pair<SDValue, SDValue> ExpandChainLibCall(RTLIB::Libcall LC,
98 SDNode *Node, bool isSigned);
99 SDValue ExpandFPLibCall(SDNode *Node, RTLIB::Libcall Call_F32,
100 RTLIB::Libcall Call_F64, RTLIB::Libcall Call_F80,
101 RTLIB::Libcall Call_PPCF128);
102 SDValue ExpandIntLibCall(SDNode *Node, bool isSigned,
103 RTLIB::Libcall Call_I8,
104 RTLIB::Libcall Call_I16,
105 RTLIB::Libcall Call_I32,
106 RTLIB::Libcall Call_I64,
107 RTLIB::Libcall Call_I128);
108 void ExpandDivRemLibCall(SDNode *Node, SmallVectorImpl<SDValue> &Results);
110 SDValue EmitStackConvert(SDValue SrcOp, EVT SlotVT, EVT DestVT, DebugLoc dl);
111 SDValue ExpandBUILD_VECTOR(SDNode *Node);
112 SDValue ExpandSCALAR_TO_VECTOR(SDNode *Node);
113 void ExpandDYNAMIC_STACKALLOC(SDNode *Node,
114 SmallVectorImpl<SDValue> &Results);
115 SDValue ExpandFCOPYSIGN(SDNode *Node);
116 SDValue ExpandLegalINT_TO_FP(bool isSigned, SDValue LegalOp, EVT DestVT,
118 SDValue PromoteLegalINT_TO_FP(SDValue LegalOp, EVT DestVT, bool isSigned,
120 SDValue PromoteLegalFP_TO_INT(SDValue LegalOp, EVT DestVT, bool isSigned,
123 SDValue ExpandBSWAP(SDValue Op, DebugLoc dl);
124 SDValue ExpandBitCount(unsigned Opc, SDValue Op, DebugLoc dl);
126 SDValue ExpandExtractFromVectorThroughStack(SDValue Op);
127 SDValue ExpandInsertToVectorThroughStack(SDValue Op);
128 SDValue ExpandVectorBuildThroughStack(SDNode* Node);
130 SDValue ExpandConstantFP(ConstantFPSDNode *CFP, bool UseCP);
132 std::pair<SDValue, SDValue> ExpandAtomic(SDNode *Node);
134 void ExpandNode(SDNode *Node);
135 void PromoteNode(SDNode *Node);
137 void ForgetNode(SDNode *N) {
138 LegalizedNodes.erase(N);
139 if (LegalizePosition == SelectionDAG::allnodes_iterator(N))
144 // DAGUpdateListener implementation.
145 virtual void NodeDeleted(SDNode *N, SDNode *E) {
148 virtual void NodeUpdated(SDNode *N) {}
150 // Node replacement helpers
151 void ReplacedNode(SDNode *N) {
152 if (N->use_empty()) {
153 DAG.RemoveDeadNode(N, this);
158 void ReplaceNode(SDNode *Old, SDNode *New) {
159 DAG.ReplaceAllUsesWith(Old, New, this);
162 void ReplaceNode(SDValue Old, SDValue New) {
163 DAG.ReplaceAllUsesWith(Old, New, this);
164 ReplacedNode(Old.getNode());
166 void ReplaceNode(SDNode *Old, const SDValue *New) {
167 DAG.ReplaceAllUsesWith(Old, New, this);
173 /// ShuffleWithNarrowerEltType - Return a vector shuffle operation which
174 /// performs the same shuffe in terms of order or result bytes, but on a type
175 /// whose vector element type is narrower than the original shuffle type.
176 /// e.g. <v4i32> <0, 1, 0, 1> -> v8i16 <0, 1, 2, 3, 0, 1, 2, 3>
178 SelectionDAGLegalize::ShuffleWithNarrowerEltType(EVT NVT, EVT VT, DebugLoc dl,
179 SDValue N1, SDValue N2,
180 SmallVectorImpl<int> &Mask) const {
181 unsigned NumMaskElts = VT.getVectorNumElements();
182 unsigned NumDestElts = NVT.getVectorNumElements();
183 unsigned NumEltsGrowth = NumDestElts / NumMaskElts;
185 assert(NumEltsGrowth && "Cannot promote to vector type with fewer elts!");
187 if (NumEltsGrowth == 1)
188 return DAG.getVectorShuffle(NVT, dl, N1, N2, &Mask[0]);
190 SmallVector<int, 8> NewMask;
191 for (unsigned i = 0; i != NumMaskElts; ++i) {
193 for (unsigned j = 0; j != NumEltsGrowth; ++j) {
195 NewMask.push_back(-1);
197 NewMask.push_back(Idx * NumEltsGrowth + j);
200 assert(NewMask.size() == NumDestElts && "Non-integer NumEltsGrowth?");
201 assert(TLI.isShuffleMaskLegal(NewMask, NVT) && "Shuffle not legal?");
202 return DAG.getVectorShuffle(NVT, dl, N1, N2, &NewMask[0]);
205 SelectionDAGLegalize::SelectionDAGLegalize(SelectionDAG &dag)
206 : TM(dag.getTarget()), TLI(dag.getTargetLoweringInfo()),
210 void SelectionDAGLegalize::LegalizeDAG() {
211 DAG.AssignTopologicalOrder();
213 // Visit all the nodes. We start in topological order, so that we see
214 // nodes with their original operands intact. Legalization can produce
215 // new nodes which may themselves need to be legalized. Iterate until all
216 // nodes have been legalized.
218 bool AnyLegalized = false;
219 for (LegalizePosition = DAG.allnodes_end();
220 LegalizePosition != DAG.allnodes_begin(); ) {
223 SDNode *N = LegalizePosition;
224 if (LegalizedNodes.insert(N)) {
234 // Remove dead nodes now.
235 DAG.RemoveDeadNodes();
238 /// ExpandConstantFP - Expands the ConstantFP node to an integer constant or
239 /// a load from the constant pool.
241 SelectionDAGLegalize::ExpandConstantFP(ConstantFPSDNode *CFP, bool UseCP) {
243 DebugLoc dl = CFP->getDebugLoc();
245 // If a FP immediate is precise when represented as a float and if the
246 // target can do an extending load from float to double, we put it into
247 // the constant pool as a float, even if it's is statically typed as a
248 // double. This shrinks FP constants and canonicalizes them for targets where
249 // an FP extending load is the same cost as a normal load (such as on the x87
250 // fp stack or PPC FP unit).
251 EVT VT = CFP->getValueType(0);
252 ConstantFP *LLVMC = const_cast<ConstantFP*>(CFP->getConstantFPValue());
254 assert((VT == MVT::f64 || VT == MVT::f32) && "Invalid type expansion");
255 return DAG.getConstant(LLVMC->getValueAPF().bitcastToAPInt(),
256 (VT == MVT::f64) ? MVT::i64 : MVT::i32);
261 while (SVT != MVT::f32) {
262 SVT = (MVT::SimpleValueType)(SVT.getSimpleVT().SimpleTy - 1);
263 if (ConstantFPSDNode::isValueValidForType(SVT, CFP->getValueAPF()) &&
264 // Only do this if the target has a native EXTLOAD instruction from
266 TLI.isLoadExtLegal(ISD::EXTLOAD, SVT) &&
267 TLI.ShouldShrinkFPConstant(OrigVT)) {
268 Type *SType = SVT.getTypeForEVT(*DAG.getContext());
269 LLVMC = cast<ConstantFP>(ConstantExpr::getFPTrunc(LLVMC, SType));
275 SDValue CPIdx = DAG.getConstantPool(LLVMC, TLI.getPointerTy());
276 unsigned Alignment = cast<ConstantPoolSDNode>(CPIdx)->getAlignment();
279 DAG.getExtLoad(ISD::EXTLOAD, dl, OrigVT,
281 CPIdx, MachinePointerInfo::getConstantPool(),
282 VT, false, false, Alignment);
286 DAG.getLoad(OrigVT, dl, DAG.getEntryNode(), CPIdx,
287 MachinePointerInfo::getConstantPool(), false, false, false,
292 /// ExpandUnalignedStore - Expands an unaligned store to 2 half-size stores.
293 static void ExpandUnalignedStore(StoreSDNode *ST, SelectionDAG &DAG,
294 const TargetLowering &TLI,
295 SelectionDAGLegalize *DAGLegalize) {
296 assert(ST->getAddressingMode() == ISD::UNINDEXED &&
297 "unaligned indexed stores not implemented!");
298 SDValue Chain = ST->getChain();
299 SDValue Ptr = ST->getBasePtr();
300 SDValue Val = ST->getValue();
301 EVT VT = Val.getValueType();
302 int Alignment = ST->getAlignment();
303 DebugLoc dl = ST->getDebugLoc();
304 if (ST->getMemoryVT().isFloatingPoint() ||
305 ST->getMemoryVT().isVector()) {
306 EVT intVT = EVT::getIntegerVT(*DAG.getContext(), VT.getSizeInBits());
307 if (TLI.isTypeLegal(intVT)) {
308 // Expand to a bitconvert of the value to the integer type of the
309 // same size, then a (misaligned) int store.
310 // FIXME: Does not handle truncating floating point stores!
311 SDValue Result = DAG.getNode(ISD::BITCAST, dl, intVT, Val);
312 Result = DAG.getStore(Chain, dl, Result, Ptr, ST->getPointerInfo(),
313 ST->isVolatile(), ST->isNonTemporal(), Alignment);
314 DAGLegalize->ReplaceNode(SDValue(ST, 0), Result);
317 // Do a (aligned) store to a stack slot, then copy from the stack slot
318 // to the final destination using (unaligned) integer loads and stores.
319 EVT StoredVT = ST->getMemoryVT();
321 TLI.getRegisterType(*DAG.getContext(),
322 EVT::getIntegerVT(*DAG.getContext(),
323 StoredVT.getSizeInBits()));
324 unsigned StoredBytes = StoredVT.getSizeInBits() / 8;
325 unsigned RegBytes = RegVT.getSizeInBits() / 8;
326 unsigned NumRegs = (StoredBytes + RegBytes - 1) / RegBytes;
328 // Make sure the stack slot is also aligned for the register type.
329 SDValue StackPtr = DAG.CreateStackTemporary(StoredVT, RegVT);
331 // Perform the original store, only redirected to the stack slot.
332 SDValue Store = DAG.getTruncStore(Chain, dl,
333 Val, StackPtr, MachinePointerInfo(),
334 StoredVT, false, false, 0);
335 SDValue Increment = DAG.getConstant(RegBytes, TLI.getPointerTy());
336 SmallVector<SDValue, 8> Stores;
339 // Do all but one copies using the full register width.
340 for (unsigned i = 1; i < NumRegs; i++) {
341 // Load one integer register's worth from the stack slot.
342 SDValue Load = DAG.getLoad(RegVT, dl, Store, StackPtr,
343 MachinePointerInfo(),
344 false, false, false, 0);
345 // Store it to the final location. Remember the store.
346 Stores.push_back(DAG.getStore(Load.getValue(1), dl, Load, Ptr,
347 ST->getPointerInfo().getWithOffset(Offset),
348 ST->isVolatile(), ST->isNonTemporal(),
349 MinAlign(ST->getAlignment(), Offset)));
350 // Increment the pointers.
352 StackPtr = DAG.getNode(ISD::ADD, dl, StackPtr.getValueType(), StackPtr,
354 Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr, Increment);
357 // The last store may be partial. Do a truncating store. On big-endian
358 // machines this requires an extending load from the stack slot to ensure
359 // that the bits are in the right place.
360 EVT MemVT = EVT::getIntegerVT(*DAG.getContext(),
361 8 * (StoredBytes - Offset));
363 // Load from the stack slot.
364 SDValue Load = DAG.getExtLoad(ISD::EXTLOAD, dl, RegVT, Store, StackPtr,
365 MachinePointerInfo(),
366 MemVT, false, false, 0);
368 Stores.push_back(DAG.getTruncStore(Load.getValue(1), dl, Load, Ptr,
370 .getWithOffset(Offset),
371 MemVT, ST->isVolatile(),
373 MinAlign(ST->getAlignment(), Offset)));
374 // The order of the stores doesn't matter - say it with a TokenFactor.
376 DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &Stores[0],
378 DAGLegalize->ReplaceNode(SDValue(ST, 0), Result);
381 assert(ST->getMemoryVT().isInteger() &&
382 !ST->getMemoryVT().isVector() &&
383 "Unaligned store of unknown type.");
384 // Get the half-size VT
385 EVT NewStoredVT = ST->getMemoryVT().getHalfSizedIntegerVT(*DAG.getContext());
386 int NumBits = NewStoredVT.getSizeInBits();
387 int IncrementSize = NumBits / 8;
389 // Divide the stored value in two parts.
390 SDValue ShiftAmount = DAG.getConstant(NumBits,
391 TLI.getShiftAmountTy(Val.getValueType()));
393 SDValue Hi = DAG.getNode(ISD::SRL, dl, VT, Val, ShiftAmount);
395 // Store the two parts
396 SDValue Store1, Store2;
397 Store1 = DAG.getTruncStore(Chain, dl, TLI.isLittleEndian()?Lo:Hi, Ptr,
398 ST->getPointerInfo(), NewStoredVT,
399 ST->isVolatile(), ST->isNonTemporal(), Alignment);
400 Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr,
401 DAG.getConstant(IncrementSize, TLI.getPointerTy()));
402 Alignment = MinAlign(Alignment, IncrementSize);
403 Store2 = DAG.getTruncStore(Chain, dl, TLI.isLittleEndian()?Hi:Lo, Ptr,
404 ST->getPointerInfo().getWithOffset(IncrementSize),
405 NewStoredVT, ST->isVolatile(), ST->isNonTemporal(),
409 DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Store1, Store2);
410 DAGLegalize->ReplaceNode(SDValue(ST, 0), Result);
413 /// ExpandUnalignedLoad - Expands an unaligned load to 2 half-size loads.
415 ExpandUnalignedLoad(LoadSDNode *LD, SelectionDAG &DAG,
416 const TargetLowering &TLI,
417 SDValue &ValResult, SDValue &ChainResult) {
418 assert(LD->getAddressingMode() == ISD::UNINDEXED &&
419 "unaligned indexed loads not implemented!");
420 SDValue Chain = LD->getChain();
421 SDValue Ptr = LD->getBasePtr();
422 EVT VT = LD->getValueType(0);
423 EVT LoadedVT = LD->getMemoryVT();
424 DebugLoc dl = LD->getDebugLoc();
425 if (VT.isFloatingPoint() || VT.isVector()) {
426 EVT intVT = EVT::getIntegerVT(*DAG.getContext(), LoadedVT.getSizeInBits());
427 if (TLI.isTypeLegal(intVT)) {
428 // Expand to a (misaligned) integer load of the same size,
429 // then bitconvert to floating point or vector.
430 SDValue newLoad = DAG.getLoad(intVT, dl, Chain, Ptr, LD->getPointerInfo(),
433 LD->isInvariant(), LD->getAlignment());
434 SDValue Result = DAG.getNode(ISD::BITCAST, dl, LoadedVT, newLoad);
435 if (VT.isFloatingPoint() && LoadedVT != VT)
436 Result = DAG.getNode(ISD::FP_EXTEND, dl, VT, Result);
443 // Copy the value to a (aligned) stack slot using (unaligned) integer
444 // loads and stores, then do a (aligned) load from the stack slot.
445 EVT RegVT = TLI.getRegisterType(*DAG.getContext(), intVT);
446 unsigned LoadedBytes = LoadedVT.getSizeInBits() / 8;
447 unsigned RegBytes = RegVT.getSizeInBits() / 8;
448 unsigned NumRegs = (LoadedBytes + RegBytes - 1) / RegBytes;
450 // Make sure the stack slot is also aligned for the register type.
451 SDValue StackBase = DAG.CreateStackTemporary(LoadedVT, RegVT);
453 SDValue Increment = DAG.getConstant(RegBytes, TLI.getPointerTy());
454 SmallVector<SDValue, 8> Stores;
455 SDValue StackPtr = StackBase;
458 // Do all but one copies using the full register width.
459 for (unsigned i = 1; i < NumRegs; i++) {
460 // Load one integer register's worth from the original location.
461 SDValue Load = DAG.getLoad(RegVT, dl, Chain, Ptr,
462 LD->getPointerInfo().getWithOffset(Offset),
463 LD->isVolatile(), LD->isNonTemporal(),
465 MinAlign(LD->getAlignment(), Offset));
466 // Follow the load with a store to the stack slot. Remember the store.
467 Stores.push_back(DAG.getStore(Load.getValue(1), dl, Load, StackPtr,
468 MachinePointerInfo(), false, false, 0));
469 // Increment the pointers.
471 Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr, Increment);
472 StackPtr = DAG.getNode(ISD::ADD, dl, StackPtr.getValueType(), StackPtr,
476 // The last copy may be partial. Do an extending load.
477 EVT MemVT = EVT::getIntegerVT(*DAG.getContext(),
478 8 * (LoadedBytes - Offset));
479 SDValue Load = DAG.getExtLoad(ISD::EXTLOAD, dl, RegVT, Chain, Ptr,
480 LD->getPointerInfo().getWithOffset(Offset),
481 MemVT, LD->isVolatile(),
483 MinAlign(LD->getAlignment(), Offset));
484 // Follow the load with a store to the stack slot. Remember the store.
485 // On big-endian machines this requires a truncating store to ensure
486 // that the bits end up in the right place.
487 Stores.push_back(DAG.getTruncStore(Load.getValue(1), dl, Load, StackPtr,
488 MachinePointerInfo(), MemVT,
491 // The order of the stores doesn't matter - say it with a TokenFactor.
492 SDValue TF = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &Stores[0],
495 // Finally, perform the original load only redirected to the stack slot.
496 Load = DAG.getExtLoad(LD->getExtensionType(), dl, VT, TF, StackBase,
497 MachinePointerInfo(), LoadedVT, false, false, 0);
499 // Callers expect a MERGE_VALUES node.
504 assert(LoadedVT.isInteger() && !LoadedVT.isVector() &&
505 "Unaligned load of unsupported type.");
507 // Compute the new VT that is half the size of the old one. This is an
509 unsigned NumBits = LoadedVT.getSizeInBits();
511 NewLoadedVT = EVT::getIntegerVT(*DAG.getContext(), NumBits/2);
514 unsigned Alignment = LD->getAlignment();
515 unsigned IncrementSize = NumBits / 8;
516 ISD::LoadExtType HiExtType = LD->getExtensionType();
518 // If the original load is NON_EXTLOAD, the hi part load must be ZEXTLOAD.
519 if (HiExtType == ISD::NON_EXTLOAD)
520 HiExtType = ISD::ZEXTLOAD;
522 // Load the value in two parts
524 if (TLI.isLittleEndian()) {
525 Lo = DAG.getExtLoad(ISD::ZEXTLOAD, dl, VT, Chain, Ptr, LD->getPointerInfo(),
526 NewLoadedVT, LD->isVolatile(),
527 LD->isNonTemporal(), Alignment);
528 Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr,
529 DAG.getConstant(IncrementSize, TLI.getPointerTy()));
530 Hi = DAG.getExtLoad(HiExtType, dl, VT, Chain, Ptr,
531 LD->getPointerInfo().getWithOffset(IncrementSize),
532 NewLoadedVT, LD->isVolatile(),
533 LD->isNonTemporal(), MinAlign(Alignment,IncrementSize));
535 Hi = DAG.getExtLoad(HiExtType, dl, VT, Chain, Ptr, LD->getPointerInfo(),
536 NewLoadedVT, LD->isVolatile(),
537 LD->isNonTemporal(), Alignment);
538 Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr,
539 DAG.getConstant(IncrementSize, TLI.getPointerTy()));
540 Lo = DAG.getExtLoad(ISD::ZEXTLOAD, dl, VT, Chain, Ptr,
541 LD->getPointerInfo().getWithOffset(IncrementSize),
542 NewLoadedVT, LD->isVolatile(),
543 LD->isNonTemporal(), MinAlign(Alignment,IncrementSize));
546 // aggregate the two parts
547 SDValue ShiftAmount = DAG.getConstant(NumBits,
548 TLI.getShiftAmountTy(Hi.getValueType()));
549 SDValue Result = DAG.getNode(ISD::SHL, dl, VT, Hi, ShiftAmount);
550 Result = DAG.getNode(ISD::OR, dl, VT, Result, Lo);
552 SDValue TF = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Lo.getValue(1),
559 /// PerformInsertVectorEltInMemory - Some target cannot handle a variable
560 /// insertion index for the INSERT_VECTOR_ELT instruction. In this case, it
561 /// is necessary to spill the vector being inserted into to memory, perform
562 /// the insert there, and then read the result back.
563 SDValue SelectionDAGLegalize::
564 PerformInsertVectorEltInMemory(SDValue Vec, SDValue Val, SDValue Idx,
570 // If the target doesn't support this, we have to spill the input vector
571 // to a temporary stack slot, update the element, then reload it. This is
572 // badness. We could also load the value into a vector register (either
573 // with a "move to register" or "extload into register" instruction, then
574 // permute it into place, if the idx is a constant and if the idx is
575 // supported by the target.
576 EVT VT = Tmp1.getValueType();
577 EVT EltVT = VT.getVectorElementType();
578 EVT IdxVT = Tmp3.getValueType();
579 EVT PtrVT = TLI.getPointerTy();
580 SDValue StackPtr = DAG.CreateStackTemporary(VT);
582 int SPFI = cast<FrameIndexSDNode>(StackPtr.getNode())->getIndex();
585 SDValue Ch = DAG.getStore(DAG.getEntryNode(), dl, Tmp1, StackPtr,
586 MachinePointerInfo::getFixedStack(SPFI),
589 // Truncate or zero extend offset to target pointer type.
590 unsigned CastOpc = IdxVT.bitsGT(PtrVT) ? ISD::TRUNCATE : ISD::ZERO_EXTEND;
591 Tmp3 = DAG.getNode(CastOpc, dl, PtrVT, Tmp3);
592 // Add the offset to the index.
593 unsigned EltSize = EltVT.getSizeInBits()/8;
594 Tmp3 = DAG.getNode(ISD::MUL, dl, IdxVT, Tmp3,DAG.getConstant(EltSize, IdxVT));
595 SDValue StackPtr2 = DAG.getNode(ISD::ADD, dl, IdxVT, Tmp3, StackPtr);
596 // Store the scalar value.
597 Ch = DAG.getTruncStore(Ch, dl, Tmp2, StackPtr2, MachinePointerInfo(), EltVT,
599 // Load the updated vector.
600 return DAG.getLoad(VT, dl, Ch, StackPtr,
601 MachinePointerInfo::getFixedStack(SPFI), false, false,
606 SDValue SelectionDAGLegalize::
607 ExpandINSERT_VECTOR_ELT(SDValue Vec, SDValue Val, SDValue Idx, DebugLoc dl) {
608 if (ConstantSDNode *InsertPos = dyn_cast<ConstantSDNode>(Idx)) {
609 // SCALAR_TO_VECTOR requires that the type of the value being inserted
610 // match the element type of the vector being created, except for
611 // integers in which case the inserted value can be over width.
612 EVT EltVT = Vec.getValueType().getVectorElementType();
613 if (Val.getValueType() == EltVT ||
614 (EltVT.isInteger() && Val.getValueType().bitsGE(EltVT))) {
615 SDValue ScVec = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl,
616 Vec.getValueType(), Val);
618 unsigned NumElts = Vec.getValueType().getVectorNumElements();
619 // We generate a shuffle of InVec and ScVec, so the shuffle mask
620 // should be 0,1,2,3,4,5... with the appropriate element replaced with
622 SmallVector<int, 8> ShufOps;
623 for (unsigned i = 0; i != NumElts; ++i)
624 ShufOps.push_back(i != InsertPos->getZExtValue() ? i : NumElts);
626 return DAG.getVectorShuffle(Vec.getValueType(), dl, Vec, ScVec,
630 return PerformInsertVectorEltInMemory(Vec, Val, Idx, dl);
633 SDValue SelectionDAGLegalize::OptimizeFloatStore(StoreSDNode* ST) {
634 // Turn 'store float 1.0, Ptr' -> 'store int 0x12345678, Ptr'
635 // FIXME: We shouldn't do this for TargetConstantFP's.
636 // FIXME: move this to the DAG Combiner! Note that we can't regress due
637 // to phase ordering between legalized code and the dag combiner. This
638 // probably means that we need to integrate dag combiner and legalizer
640 // We generally can't do this one for long doubles.
641 SDValue Tmp1 = ST->getChain();
642 SDValue Tmp2 = ST->getBasePtr();
644 unsigned Alignment = ST->getAlignment();
645 bool isVolatile = ST->isVolatile();
646 bool isNonTemporal = ST->isNonTemporal();
647 DebugLoc dl = ST->getDebugLoc();
648 if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(ST->getValue())) {
649 if (CFP->getValueType(0) == MVT::f32 &&
650 TLI.isTypeLegal(MVT::i32)) {
651 Tmp3 = DAG.getConstant(CFP->getValueAPF().
652 bitcastToAPInt().zextOrTrunc(32),
654 return DAG.getStore(Tmp1, dl, Tmp3, Tmp2, ST->getPointerInfo(),
655 isVolatile, isNonTemporal, Alignment);
658 if (CFP->getValueType(0) == MVT::f64) {
659 // If this target supports 64-bit registers, do a single 64-bit store.
660 if (TLI.isTypeLegal(MVT::i64)) {
661 Tmp3 = DAG.getConstant(CFP->getValueAPF().bitcastToAPInt().
662 zextOrTrunc(64), MVT::i64);
663 return DAG.getStore(Tmp1, dl, Tmp3, Tmp2, ST->getPointerInfo(),
664 isVolatile, isNonTemporal, Alignment);
667 if (TLI.isTypeLegal(MVT::i32) && !ST->isVolatile()) {
668 // Otherwise, if the target supports 32-bit registers, use 2 32-bit
669 // stores. If the target supports neither 32- nor 64-bits, this
670 // xform is certainly not worth it.
671 const APInt &IntVal =CFP->getValueAPF().bitcastToAPInt();
672 SDValue Lo = DAG.getConstant(IntVal.trunc(32), MVT::i32);
673 SDValue Hi = DAG.getConstant(IntVal.lshr(32).trunc(32), MVT::i32);
674 if (TLI.isBigEndian()) std::swap(Lo, Hi);
676 Lo = DAG.getStore(Tmp1, dl, Lo, Tmp2, ST->getPointerInfo(), isVolatile,
677 isNonTemporal, Alignment);
678 Tmp2 = DAG.getNode(ISD::ADD, dl, Tmp2.getValueType(), Tmp2,
679 DAG.getIntPtrConstant(4));
680 Hi = DAG.getStore(Tmp1, dl, Hi, Tmp2,
681 ST->getPointerInfo().getWithOffset(4),
682 isVolatile, isNonTemporal, MinAlign(Alignment, 4U));
684 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Lo, Hi);
688 return SDValue(0, 0);
691 /// LegalizeOp - Return a legal replacement for the given operation, with
692 /// all legal operands.
693 void SelectionDAGLegalize::LegalizeOp(SDNode *Node) {
694 if (Node->getOpcode() == ISD::TargetConstant) // Allow illegal target nodes.
697 DebugLoc dl = Node->getDebugLoc();
699 for (unsigned i = 0, e = Node->getNumValues(); i != e; ++i)
700 assert(TLI.getTypeAction(*DAG.getContext(), Node->getValueType(i)) ==
701 TargetLowering::TypeLegal &&
702 "Unexpected illegal type!");
704 for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i)
705 assert((TLI.getTypeAction(*DAG.getContext(),
706 Node->getOperand(i).getValueType()) ==
707 TargetLowering::TypeLegal ||
708 Node->getOperand(i).getOpcode() == ISD::TargetConstant) &&
709 "Unexpected illegal type!");
711 SDValue Tmp1, Tmp2, Tmp3, Tmp4;
712 bool isCustom = false;
714 // Figure out the correct action; the way to query this varies by opcode
715 TargetLowering::LegalizeAction Action = TargetLowering::Legal;
716 bool SimpleFinishLegalizing = true;
717 switch (Node->getOpcode()) {
718 case ISD::INTRINSIC_W_CHAIN:
719 case ISD::INTRINSIC_WO_CHAIN:
720 case ISD::INTRINSIC_VOID:
723 Action = TLI.getOperationAction(Node->getOpcode(), MVT::Other);
725 case ISD::SINT_TO_FP:
726 case ISD::UINT_TO_FP:
727 case ISD::EXTRACT_VECTOR_ELT:
728 Action = TLI.getOperationAction(Node->getOpcode(),
729 Node->getOperand(0).getValueType());
731 case ISD::FP_ROUND_INREG:
732 case ISD::SIGN_EXTEND_INREG: {
733 EVT InnerType = cast<VTSDNode>(Node->getOperand(1))->getVT();
734 Action = TLI.getOperationAction(Node->getOpcode(), InnerType);
737 case ISD::ATOMIC_STORE: {
738 Action = TLI.getOperationAction(Node->getOpcode(),
739 Node->getOperand(2).getValueType());
745 unsigned CCOperand = Node->getOpcode() == ISD::SELECT_CC ? 4 :
746 Node->getOpcode() == ISD::SETCC ? 2 : 1;
747 unsigned CompareOperand = Node->getOpcode() == ISD::BR_CC ? 2 : 0;
748 EVT OpVT = Node->getOperand(CompareOperand).getValueType();
749 ISD::CondCode CCCode =
750 cast<CondCodeSDNode>(Node->getOperand(CCOperand))->get();
751 Action = TLI.getCondCodeAction(CCCode, OpVT);
752 if (Action == TargetLowering::Legal) {
753 if (Node->getOpcode() == ISD::SELECT_CC)
754 Action = TLI.getOperationAction(Node->getOpcode(),
755 Node->getValueType(0));
757 Action = TLI.getOperationAction(Node->getOpcode(), OpVT);
763 // FIXME: Model these properly. LOAD and STORE are complicated, and
764 // STORE expects the unlegalized operand in some cases.
765 SimpleFinishLegalizing = false;
767 case ISD::CALLSEQ_START:
768 case ISD::CALLSEQ_END:
769 // FIXME: This shouldn't be necessary. These nodes have special properties
770 // dealing with the recursive nature of legalization. Removing this
771 // special case should be done as part of making LegalizeDAG non-recursive.
772 SimpleFinishLegalizing = false;
774 case ISD::EXTRACT_ELEMENT:
775 case ISD::FLT_ROUNDS_:
783 case ISD::MERGE_VALUES:
785 case ISD::FRAME_TO_ARGS_OFFSET:
786 case ISD::EH_SJLJ_SETJMP:
787 case ISD::EH_SJLJ_LONGJMP:
788 case ISD::EH_SJLJ_DISPATCHSETUP:
789 // These operations lie about being legal: when they claim to be legal,
790 // they should actually be expanded.
791 Action = TLI.getOperationAction(Node->getOpcode(), Node->getValueType(0));
792 if (Action == TargetLowering::Legal)
793 Action = TargetLowering::Expand;
795 case ISD::INIT_TRAMPOLINE:
796 case ISD::ADJUST_TRAMPOLINE:
798 case ISD::RETURNADDR:
799 // These operations lie about being legal: when they claim to be legal,
800 // they should actually be custom-lowered.
801 Action = TLI.getOperationAction(Node->getOpcode(), Node->getValueType(0));
802 if (Action == TargetLowering::Legal)
803 Action = TargetLowering::Custom;
806 if (Node->getOpcode() >= ISD::BUILTIN_OP_END) {
807 Action = TargetLowering::Legal;
809 Action = TLI.getOperationAction(Node->getOpcode(), Node->getValueType(0));
814 if (SimpleFinishLegalizing) {
815 SmallVector<SDValue, 8> Ops;
816 for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i)
817 Ops.push_back(Node->getOperand(i));
818 switch (Node->getOpcode()) {
825 // Legalizing shifts/rotates requires adjusting the shift amount
826 // to the appropriate width.
827 if (!Ops[1].getValueType().isVector()) {
828 SDValue SAO = DAG.getShiftAmountOperand(Ops[0].getValueType(), Ops[1]);
829 HandleSDNode Handle(SAO);
830 LegalizeOp(SAO.getNode());
831 Ops[1] = Handle.getValue();
837 // Legalizing shifts/rotates requires adjusting the shift amount
838 // to the appropriate width.
839 if (!Ops[2].getValueType().isVector()) {
840 SDValue SAO = DAG.getShiftAmountOperand(Ops[0].getValueType(), Ops[2]);
841 HandleSDNode Handle(SAO);
842 LegalizeOp(SAO.getNode());
843 Ops[2] = Handle.getValue();
848 SDNode *NewNode = DAG.UpdateNodeOperands(Node, Ops.data(), Ops.size());
849 if (NewNode != Node) {
850 DAG.ReplaceAllUsesWith(Node, NewNode, this);
851 for (unsigned i = 0, e = Node->getNumValues(); i != e; ++i)
852 DAG.TransferDbgValues(SDValue(Node, i), SDValue(NewNode, i));
857 case TargetLowering::Legal:
859 case TargetLowering::Custom:
860 // FIXME: The handling for custom lowering with multiple results is
862 Tmp1 = TLI.LowerOperation(SDValue(Node, 0), DAG);
863 if (Tmp1.getNode()) {
864 SmallVector<SDValue, 8> ResultVals;
865 for (unsigned i = 0, e = Node->getNumValues(); i != e; ++i) {
867 ResultVals.push_back(Tmp1);
869 ResultVals.push_back(Tmp1.getValue(i));
871 if (Tmp1.getNode() != Node || Tmp1.getResNo() != 0) {
872 DAG.ReplaceAllUsesWith(Node, ResultVals.data(), this);
873 for (unsigned i = 0, e = Node->getNumValues(); i != e; ++i)
874 DAG.TransferDbgValues(SDValue(Node, i), ResultVals[i]);
881 case TargetLowering::Expand:
884 case TargetLowering::Promote:
890 switch (Node->getOpcode()) {
897 assert(0 && "Do not know how to legalize this operator!");
899 case ISD::CALLSEQ_START:
900 case ISD::CALLSEQ_END:
903 LoadSDNode *LD = cast<LoadSDNode>(Node);
904 Tmp1 = LD->getChain(); // Legalize the chain.
905 Tmp2 = LD->getBasePtr(); // Legalize the base pointer.
907 ISD::LoadExtType ExtType = LD->getExtensionType();
908 if (ExtType == ISD::NON_EXTLOAD) {
909 EVT VT = Node->getValueType(0);
910 Tmp3 = SDValue(Node, 0);
911 Tmp4 = SDValue(Node, 1);
913 switch (TLI.getOperationAction(Node->getOpcode(), VT)) {
914 default: assert(0 && "This action is not supported yet!");
915 case TargetLowering::Legal:
916 // If this is an unaligned load and the target doesn't support it,
918 if (!TLI.allowsUnalignedMemoryAccesses(LD->getMemoryVT())) {
919 Type *Ty = LD->getMemoryVT().getTypeForEVT(*DAG.getContext());
920 unsigned ABIAlignment = TLI.getTargetData()->getABITypeAlignment(Ty);
921 if (LD->getAlignment() < ABIAlignment){
922 ExpandUnalignedLoad(cast<LoadSDNode>(Node),
923 DAG, TLI, Tmp3, Tmp4);
927 case TargetLowering::Custom:
928 Tmp1 = TLI.LowerOperation(Tmp3, DAG);
929 if (Tmp1.getNode()) {
931 Tmp4 = Tmp1.getValue(1);
934 case TargetLowering::Promote: {
935 // Only promote a load of vector type to another.
936 assert(VT.isVector() && "Cannot promote this load!");
937 // Change base type to a different vector type.
938 EVT NVT = TLI.getTypeToPromoteTo(Node->getOpcode(), VT);
940 Tmp1 = DAG.getLoad(NVT, dl, Tmp1, Tmp2, LD->getPointerInfo(),
941 LD->isVolatile(), LD->isNonTemporal(),
942 LD->isInvariant(), LD->getAlignment());
943 Tmp3 = DAG.getNode(ISD::BITCAST, dl, VT, Tmp1);
944 Tmp4 = Tmp1.getValue(1);
948 if (Tmp4.getNode() != Node) {
949 assert(Tmp3.getNode() != Node && "Load must be completely replaced");
950 DAG.ReplaceAllUsesOfValueWith(SDValue(Node, 0), Tmp3);
951 DAG.ReplaceAllUsesOfValueWith(SDValue(Node, 1), Tmp4);
957 EVT SrcVT = LD->getMemoryVT();
958 unsigned SrcWidth = SrcVT.getSizeInBits();
959 unsigned Alignment = LD->getAlignment();
960 bool isVolatile = LD->isVolatile();
961 bool isNonTemporal = LD->isNonTemporal();
963 if (SrcWidth != SrcVT.getStoreSizeInBits() &&
964 // Some targets pretend to have an i1 loading operation, and actually
965 // load an i8. This trick is correct for ZEXTLOAD because the top 7
966 // bits are guaranteed to be zero; it helps the optimizers understand
967 // that these bits are zero. It is also useful for EXTLOAD, since it
968 // tells the optimizers that those bits are undefined. It would be
969 // nice to have an effective generic way of getting these benefits...
970 // Until such a way is found, don't insist on promoting i1 here.
972 TLI.getLoadExtAction(ExtType, MVT::i1) == TargetLowering::Promote)) {
973 // Promote to a byte-sized load if not loading an integral number of
974 // bytes. For example, promote EXTLOAD:i20 -> EXTLOAD:i24.
975 unsigned NewWidth = SrcVT.getStoreSizeInBits();
976 EVT NVT = EVT::getIntegerVT(*DAG.getContext(), NewWidth);
979 // The extra bits are guaranteed to be zero, since we stored them that
980 // way. A zext load from NVT thus automatically gives zext from SrcVT.
982 ISD::LoadExtType NewExtType =
983 ExtType == ISD::ZEXTLOAD ? ISD::ZEXTLOAD : ISD::EXTLOAD;
986 DAG.getExtLoad(NewExtType, dl, Node->getValueType(0),
987 Tmp1, Tmp2, LD->getPointerInfo(),
988 NVT, isVolatile, isNonTemporal, Alignment);
990 Ch = Result.getValue(1); // The chain.
992 if (ExtType == ISD::SEXTLOAD)
993 // Having the top bits zero doesn't help when sign extending.
994 Result = DAG.getNode(ISD::SIGN_EXTEND_INREG, dl,
995 Result.getValueType(),
996 Result, DAG.getValueType(SrcVT));
997 else if (ExtType == ISD::ZEXTLOAD || NVT == Result.getValueType())
998 // All the top bits are guaranteed to be zero - inform the optimizers.
999 Result = DAG.getNode(ISD::AssertZext, dl,
1000 Result.getValueType(), Result,
1001 DAG.getValueType(SrcVT));
1005 } else if (SrcWidth & (SrcWidth - 1)) {
1006 // If not loading a power-of-2 number of bits, expand as two loads.
1007 assert(!SrcVT.isVector() && "Unsupported extload!");
1008 unsigned RoundWidth = 1 << Log2_32(SrcWidth);
1009 assert(RoundWidth < SrcWidth);
1010 unsigned ExtraWidth = SrcWidth - RoundWidth;
1011 assert(ExtraWidth < RoundWidth);
1012 assert(!(RoundWidth % 8) && !(ExtraWidth % 8) &&
1013 "Load size not an integral number of bytes!");
1014 EVT RoundVT = EVT::getIntegerVT(*DAG.getContext(), RoundWidth);
1015 EVT ExtraVT = EVT::getIntegerVT(*DAG.getContext(), ExtraWidth);
1017 unsigned IncrementSize;
1019 if (TLI.isLittleEndian()) {
1020 // EXTLOAD:i24 -> ZEXTLOAD:i16 | (shl EXTLOAD@+2:i8, 16)
1021 // Load the bottom RoundWidth bits.
1022 Lo = DAG.getExtLoad(ISD::ZEXTLOAD, dl, Node->getValueType(0),
1024 LD->getPointerInfo(), RoundVT, isVolatile,
1025 isNonTemporal, Alignment);
1027 // Load the remaining ExtraWidth bits.
1028 IncrementSize = RoundWidth / 8;
1029 Tmp2 = DAG.getNode(ISD::ADD, dl, Tmp2.getValueType(), Tmp2,
1030 DAG.getIntPtrConstant(IncrementSize));
1031 Hi = DAG.getExtLoad(ExtType, dl, Node->getValueType(0), Tmp1, Tmp2,
1032 LD->getPointerInfo().getWithOffset(IncrementSize),
1033 ExtraVT, isVolatile, isNonTemporal,
1034 MinAlign(Alignment, IncrementSize));
1036 // Build a factor node to remember that this load is independent of
1038 Ch = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Lo.getValue(1),
1041 // Move the top bits to the right place.
1042 Hi = DAG.getNode(ISD::SHL, dl, Hi.getValueType(), Hi,
1043 DAG.getConstant(RoundWidth,
1044 TLI.getShiftAmountTy(Hi.getValueType())));
1046 // Join the hi and lo parts.
1047 Tmp1 = DAG.getNode(ISD::OR, dl, Node->getValueType(0), Lo, Hi);
1049 // Big endian - avoid unaligned loads.
1050 // EXTLOAD:i24 -> (shl EXTLOAD:i16, 8) | ZEXTLOAD@+2:i8
1051 // Load the top RoundWidth bits.
1052 Hi = DAG.getExtLoad(ExtType, dl, Node->getValueType(0), Tmp1, Tmp2,
1053 LD->getPointerInfo(), RoundVT, isVolatile,
1054 isNonTemporal, Alignment);
1056 // Load the remaining ExtraWidth bits.
1057 IncrementSize = RoundWidth / 8;
1058 Tmp2 = DAG.getNode(ISD::ADD, dl, Tmp2.getValueType(), Tmp2,
1059 DAG.getIntPtrConstant(IncrementSize));
1060 Lo = DAG.getExtLoad(ISD::ZEXTLOAD,
1061 dl, Node->getValueType(0), Tmp1, Tmp2,
1062 LD->getPointerInfo().getWithOffset(IncrementSize),
1063 ExtraVT, isVolatile, isNonTemporal,
1064 MinAlign(Alignment, IncrementSize));
1066 // Build a factor node to remember that this load is independent of
1068 Ch = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Lo.getValue(1),
1071 // Move the top bits to the right place.
1072 Hi = DAG.getNode(ISD::SHL, dl, Hi.getValueType(), Hi,
1073 DAG.getConstant(ExtraWidth,
1074 TLI.getShiftAmountTy(Hi.getValueType())));
1076 // Join the hi and lo parts.
1077 Tmp1 = DAG.getNode(ISD::OR, dl, Node->getValueType(0), Lo, Hi);
1082 switch (TLI.getLoadExtAction(ExtType, SrcVT)) {
1083 default: assert(0 && "This action is not supported yet!");
1084 case TargetLowering::Custom:
1087 case TargetLowering::Legal:
1088 Tmp1 = SDValue(Node, 0);
1089 Tmp2 = SDValue(Node, 1);
1092 Tmp3 = TLI.LowerOperation(SDValue(Node, 0), DAG);
1093 if (Tmp3.getNode()) {
1095 Tmp2 = Tmp3.getValue(1);
1098 // If this is an unaligned load and the target doesn't support it,
1100 if (!TLI.allowsUnalignedMemoryAccesses(LD->getMemoryVT())) {
1102 LD->getMemoryVT().getTypeForEVT(*DAG.getContext());
1103 unsigned ABIAlignment =
1104 TLI.getTargetData()->getABITypeAlignment(Ty);
1105 if (LD->getAlignment() < ABIAlignment){
1106 ExpandUnalignedLoad(cast<LoadSDNode>(Node),
1107 DAG, TLI, Tmp1, Tmp2);
1112 case TargetLowering::Expand:
1113 if (!TLI.isLoadExtLegal(ISD::EXTLOAD, SrcVT) && TLI.isTypeLegal(SrcVT)) {
1114 SDValue Load = DAG.getLoad(SrcVT, dl, Tmp1, Tmp2,
1115 LD->getPointerInfo(),
1116 LD->isVolatile(), LD->isNonTemporal(),
1117 LD->isInvariant(), LD->getAlignment());
1121 ExtendOp = (SrcVT.isFloatingPoint() ?
1122 ISD::FP_EXTEND : ISD::ANY_EXTEND);
1124 case ISD::SEXTLOAD: ExtendOp = ISD::SIGN_EXTEND; break;
1125 case ISD::ZEXTLOAD: ExtendOp = ISD::ZERO_EXTEND; break;
1126 default: llvm_unreachable("Unexpected extend load type!");
1128 Tmp1 = DAG.getNode(ExtendOp, dl, Node->getValueType(0), Load);
1129 Tmp2 = Load.getValue(1);
1133 assert(!SrcVT.isVector() &&
1134 "Vector Loads are handled in LegalizeVectorOps");
1136 // FIXME: This does not work for vectors on most targets. Sign- and
1137 // zero-extend operations are currently folded into extending loads,
1138 // whether they are legal or not, and then we end up here without any
1139 // support for legalizing them.
1140 assert(ExtType != ISD::EXTLOAD &&
1141 "EXTLOAD should always be supported!");
1142 // Turn the unsupported load into an EXTLOAD followed by an explicit
1143 // zero/sign extend inreg.
1144 SDValue Result = DAG.getExtLoad(ISD::EXTLOAD, dl, Node->getValueType(0),
1145 Tmp1, Tmp2, LD->getPointerInfo(), SrcVT,
1146 LD->isVolatile(), LD->isNonTemporal(),
1147 LD->getAlignment());
1149 if (ExtType == ISD::SEXTLOAD)
1150 ValRes = DAG.getNode(ISD::SIGN_EXTEND_INREG, dl,
1151 Result.getValueType(),
1152 Result, DAG.getValueType(SrcVT));
1154 ValRes = DAG.getZeroExtendInReg(Result, dl, SrcVT.getScalarType());
1156 Tmp2 = Result.getValue(1);
1161 // Since loads produce two values, make sure to remember that we legalized
1163 if (Tmp2.getNode() != Node) {
1164 assert(Tmp1.getNode() != Node && "Load must be completely replaced");
1165 DAG.ReplaceAllUsesOfValueWith(SDValue(Node, 0), Tmp1);
1166 DAG.ReplaceAllUsesOfValueWith(SDValue(Node, 1), Tmp2);
1172 StoreSDNode *ST = cast<StoreSDNode>(Node);
1173 Tmp1 = ST->getChain();
1174 Tmp2 = ST->getBasePtr();
1175 unsigned Alignment = ST->getAlignment();
1176 bool isVolatile = ST->isVolatile();
1177 bool isNonTemporal = ST->isNonTemporal();
1179 if (!ST->isTruncatingStore()) {
1180 if (SDNode *OptStore = OptimizeFloatStore(ST).getNode()) {
1181 ReplaceNode(ST, OptStore);
1186 Tmp3 = ST->getValue();
1187 EVT VT = Tmp3.getValueType();
1188 switch (TLI.getOperationAction(ISD::STORE, VT)) {
1189 default: assert(0 && "This action is not supported yet!");
1190 case TargetLowering::Legal:
1191 // If this is an unaligned store and the target doesn't support it,
1193 if (!TLI.allowsUnalignedMemoryAccesses(ST->getMemoryVT())) {
1194 Type *Ty = ST->getMemoryVT().getTypeForEVT(*DAG.getContext());
1195 unsigned ABIAlignment= TLI.getTargetData()->getABITypeAlignment(Ty);
1196 if (ST->getAlignment() < ABIAlignment)
1197 ExpandUnalignedStore(cast<StoreSDNode>(Node),
1201 case TargetLowering::Custom:
1202 Tmp1 = TLI.LowerOperation(SDValue(Node, 0), DAG);
1204 ReplaceNode(SDValue(Node, 0), Tmp1);
1206 case TargetLowering::Promote: {
1207 assert(VT.isVector() && "Unknown legal promote case!");
1208 Tmp3 = DAG.getNode(ISD::BITCAST, dl,
1209 TLI.getTypeToPromoteTo(ISD::STORE, VT), Tmp3);
1211 DAG.getStore(Tmp1, dl, Tmp3, Tmp2,
1212 ST->getPointerInfo(), isVolatile,
1213 isNonTemporal, Alignment);
1214 ReplaceNode(SDValue(Node, 0), Result);
1221 Tmp3 = ST->getValue();
1223 EVT StVT = ST->getMemoryVT();
1224 unsigned StWidth = StVT.getSizeInBits();
1226 if (StWidth != StVT.getStoreSizeInBits()) {
1227 // Promote to a byte-sized store with upper bits zero if not
1228 // storing an integral number of bytes. For example, promote
1229 // TRUNCSTORE:i1 X -> TRUNCSTORE:i8 (and X, 1)
1230 EVT NVT = EVT::getIntegerVT(*DAG.getContext(),
1231 StVT.getStoreSizeInBits());
1232 Tmp3 = DAG.getZeroExtendInReg(Tmp3, dl, StVT);
1234 DAG.getTruncStore(Tmp1, dl, Tmp3, Tmp2, ST->getPointerInfo(),
1235 NVT, isVolatile, isNonTemporal, Alignment);
1236 ReplaceNode(SDValue(Node, 0), Result);
1237 } else if (StWidth & (StWidth - 1)) {
1238 // If not storing a power-of-2 number of bits, expand as two stores.
1239 assert(!StVT.isVector() && "Unsupported truncstore!");
1240 unsigned RoundWidth = 1 << Log2_32(StWidth);
1241 assert(RoundWidth < StWidth);
1242 unsigned ExtraWidth = StWidth - RoundWidth;
1243 assert(ExtraWidth < RoundWidth);
1244 assert(!(RoundWidth % 8) && !(ExtraWidth % 8) &&
1245 "Store size not an integral number of bytes!");
1246 EVT RoundVT = EVT::getIntegerVT(*DAG.getContext(), RoundWidth);
1247 EVT ExtraVT = EVT::getIntegerVT(*DAG.getContext(), ExtraWidth);
1249 unsigned IncrementSize;
1251 if (TLI.isLittleEndian()) {
1252 // TRUNCSTORE:i24 X -> TRUNCSTORE:i16 X, TRUNCSTORE@+2:i8 (srl X, 16)
1253 // Store the bottom RoundWidth bits.
1254 Lo = DAG.getTruncStore(Tmp1, dl, Tmp3, Tmp2, ST->getPointerInfo(),
1256 isVolatile, isNonTemporal, Alignment);
1258 // Store the remaining ExtraWidth bits.
1259 IncrementSize = RoundWidth / 8;
1260 Tmp2 = DAG.getNode(ISD::ADD, dl, Tmp2.getValueType(), Tmp2,
1261 DAG.getIntPtrConstant(IncrementSize));
1262 Hi = DAG.getNode(ISD::SRL, dl, Tmp3.getValueType(), Tmp3,
1263 DAG.getConstant(RoundWidth,
1264 TLI.getShiftAmountTy(Tmp3.getValueType())));
1265 Hi = DAG.getTruncStore(Tmp1, dl, Hi, Tmp2,
1266 ST->getPointerInfo().getWithOffset(IncrementSize),
1267 ExtraVT, isVolatile, isNonTemporal,
1268 MinAlign(Alignment, IncrementSize));
1270 // Big endian - avoid unaligned stores.
1271 // TRUNCSTORE:i24 X -> TRUNCSTORE:i16 (srl X, 8), TRUNCSTORE@+2:i8 X
1272 // Store the top RoundWidth bits.
1273 Hi = DAG.getNode(ISD::SRL, dl, Tmp3.getValueType(), Tmp3,
1274 DAG.getConstant(ExtraWidth,
1275 TLI.getShiftAmountTy(Tmp3.getValueType())));
1276 Hi = DAG.getTruncStore(Tmp1, dl, Hi, Tmp2, ST->getPointerInfo(),
1277 RoundVT, isVolatile, isNonTemporal, Alignment);
1279 // Store the remaining ExtraWidth bits.
1280 IncrementSize = RoundWidth / 8;
1281 Tmp2 = DAG.getNode(ISD::ADD, dl, Tmp2.getValueType(), Tmp2,
1282 DAG.getIntPtrConstant(IncrementSize));
1283 Lo = DAG.getTruncStore(Tmp1, dl, Tmp3, Tmp2,
1284 ST->getPointerInfo().getWithOffset(IncrementSize),
1285 ExtraVT, isVolatile, isNonTemporal,
1286 MinAlign(Alignment, IncrementSize));
1289 // The order of the stores doesn't matter.
1290 SDValue Result = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Lo, Hi);
1291 ReplaceNode(SDValue(Node, 0), Result);
1293 switch (TLI.getTruncStoreAction(ST->getValue().getValueType(), StVT)) {
1294 default: assert(0 && "This action is not supported yet!");
1295 case TargetLowering::Legal:
1296 // If this is an unaligned store and the target doesn't support it,
1298 if (!TLI.allowsUnalignedMemoryAccesses(ST->getMemoryVT())) {
1299 Type *Ty = ST->getMemoryVT().getTypeForEVT(*DAG.getContext());
1300 unsigned ABIAlignment= TLI.getTargetData()->getABITypeAlignment(Ty);
1301 if (ST->getAlignment() < ABIAlignment)
1302 ExpandUnalignedStore(cast<StoreSDNode>(Node), DAG, TLI, this);
1305 case TargetLowering::Custom:
1306 ReplaceNode(SDValue(Node, 0),
1307 TLI.LowerOperation(SDValue(Node, 0), DAG));
1309 case TargetLowering::Expand:
1310 assert(!StVT.isVector() &&
1311 "Vector Stores are handled in LegalizeVectorOps");
1313 // TRUNCSTORE:i16 i32 -> STORE i16
1314 assert(TLI.isTypeLegal(StVT) && "Do not know how to expand this store!");
1315 Tmp3 = DAG.getNode(ISD::TRUNCATE, dl, StVT, Tmp3);
1317 DAG.getStore(Tmp1, dl, Tmp3, Tmp2, ST->getPointerInfo(),
1318 isVolatile, isNonTemporal, Alignment);
1319 ReplaceNode(SDValue(Node, 0), Result);
1329 SDValue SelectionDAGLegalize::ExpandExtractFromVectorThroughStack(SDValue Op) {
1330 SDValue Vec = Op.getOperand(0);
1331 SDValue Idx = Op.getOperand(1);
1332 DebugLoc dl = Op.getDebugLoc();
1333 // Store the value to a temporary stack slot, then LOAD the returned part.
1334 SDValue StackPtr = DAG.CreateStackTemporary(Vec.getValueType());
1335 SDValue Ch = DAG.getStore(DAG.getEntryNode(), dl, Vec, StackPtr,
1336 MachinePointerInfo(), false, false, 0);
1338 // Add the offset to the index.
1340 Vec.getValueType().getVectorElementType().getSizeInBits()/8;
1341 Idx = DAG.getNode(ISD::MUL, dl, Idx.getValueType(), Idx,
1342 DAG.getConstant(EltSize, Idx.getValueType()));
1344 if (Idx.getValueType().bitsGT(TLI.getPointerTy()))
1345 Idx = DAG.getNode(ISD::TRUNCATE, dl, TLI.getPointerTy(), Idx);
1347 Idx = DAG.getNode(ISD::ZERO_EXTEND, dl, TLI.getPointerTy(), Idx);
1349 StackPtr = DAG.getNode(ISD::ADD, dl, Idx.getValueType(), Idx, StackPtr);
1351 if (Op.getValueType().isVector())
1352 return DAG.getLoad(Op.getValueType(), dl, Ch, StackPtr,MachinePointerInfo(),
1353 false, false, false, 0);
1354 return DAG.getExtLoad(ISD::EXTLOAD, dl, Op.getValueType(), Ch, StackPtr,
1355 MachinePointerInfo(),
1356 Vec.getValueType().getVectorElementType(),
1360 SDValue SelectionDAGLegalize::ExpandInsertToVectorThroughStack(SDValue Op) {
1361 assert(Op.getValueType().isVector() && "Non-vector insert subvector!");
1363 SDValue Vec = Op.getOperand(0);
1364 SDValue Part = Op.getOperand(1);
1365 SDValue Idx = Op.getOperand(2);
1366 DebugLoc dl = Op.getDebugLoc();
1368 // Store the value to a temporary stack slot, then LOAD the returned part.
1370 SDValue StackPtr = DAG.CreateStackTemporary(Vec.getValueType());
1371 int FI = cast<FrameIndexSDNode>(StackPtr.getNode())->getIndex();
1372 MachinePointerInfo PtrInfo = MachinePointerInfo::getFixedStack(FI);
1374 // First store the whole vector.
1375 SDValue Ch = DAG.getStore(DAG.getEntryNode(), dl, Vec, StackPtr, PtrInfo,
1378 // Then store the inserted part.
1380 // Add the offset to the index.
1382 Vec.getValueType().getVectorElementType().getSizeInBits()/8;
1384 Idx = DAG.getNode(ISD::MUL, dl, Idx.getValueType(), Idx,
1385 DAG.getConstant(EltSize, Idx.getValueType()));
1387 if (Idx.getValueType().bitsGT(TLI.getPointerTy()))
1388 Idx = DAG.getNode(ISD::TRUNCATE, dl, TLI.getPointerTy(), Idx);
1390 Idx = DAG.getNode(ISD::ZERO_EXTEND, dl, TLI.getPointerTy(), Idx);
1392 SDValue SubStackPtr = DAG.getNode(ISD::ADD, dl, Idx.getValueType(), Idx,
1395 // Store the subvector.
1396 Ch = DAG.getStore(DAG.getEntryNode(), dl, Part, SubStackPtr,
1397 MachinePointerInfo(), false, false, 0);
1399 // Finally, load the updated vector.
1400 return DAG.getLoad(Op.getValueType(), dl, Ch, StackPtr, PtrInfo,
1401 false, false, false, 0);
1404 SDValue SelectionDAGLegalize::ExpandVectorBuildThroughStack(SDNode* Node) {
1405 // We can't handle this case efficiently. Allocate a sufficiently
1406 // aligned object on the stack, store each element into it, then load
1407 // the result as a vector.
1408 // Create the stack frame object.
1409 EVT VT = Node->getValueType(0);
1410 EVT EltVT = VT.getVectorElementType();
1411 DebugLoc dl = Node->getDebugLoc();
1412 SDValue FIPtr = DAG.CreateStackTemporary(VT);
1413 int FI = cast<FrameIndexSDNode>(FIPtr.getNode())->getIndex();
1414 MachinePointerInfo PtrInfo = MachinePointerInfo::getFixedStack(FI);
1416 // Emit a store of each element to the stack slot.
1417 SmallVector<SDValue, 8> Stores;
1418 unsigned TypeByteSize = EltVT.getSizeInBits() / 8;
1419 // Store (in the right endianness) the elements to memory.
1420 for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i) {
1421 // Ignore undef elements.
1422 if (Node->getOperand(i).getOpcode() == ISD::UNDEF) continue;
1424 unsigned Offset = TypeByteSize*i;
1426 SDValue Idx = DAG.getConstant(Offset, FIPtr.getValueType());
1427 Idx = DAG.getNode(ISD::ADD, dl, FIPtr.getValueType(), FIPtr, Idx);
1429 // If the destination vector element type is narrower than the source
1430 // element type, only store the bits necessary.
1431 if (EltVT.bitsLT(Node->getOperand(i).getValueType().getScalarType())) {
1432 Stores.push_back(DAG.getTruncStore(DAG.getEntryNode(), dl,
1433 Node->getOperand(i), Idx,
1434 PtrInfo.getWithOffset(Offset),
1435 EltVT, false, false, 0));
1437 Stores.push_back(DAG.getStore(DAG.getEntryNode(), dl,
1438 Node->getOperand(i), Idx,
1439 PtrInfo.getWithOffset(Offset),
1444 if (!Stores.empty()) // Not all undef elements?
1445 StoreChain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
1446 &Stores[0], Stores.size());
1448 StoreChain = DAG.getEntryNode();
1450 // Result is a load from the stack slot.
1451 return DAG.getLoad(VT, dl, StoreChain, FIPtr, PtrInfo,
1452 false, false, false, 0);
1455 SDValue SelectionDAGLegalize::ExpandFCOPYSIGN(SDNode* Node) {
1456 DebugLoc dl = Node->getDebugLoc();
1457 SDValue Tmp1 = Node->getOperand(0);
1458 SDValue Tmp2 = Node->getOperand(1);
1460 // Get the sign bit of the RHS. First obtain a value that has the same
1461 // sign as the sign bit, i.e. negative if and only if the sign bit is 1.
1463 EVT FloatVT = Tmp2.getValueType();
1464 EVT IVT = EVT::getIntegerVT(*DAG.getContext(), FloatVT.getSizeInBits());
1465 if (TLI.isTypeLegal(IVT)) {
1466 // Convert to an integer with the same sign bit.
1467 SignBit = DAG.getNode(ISD::BITCAST, dl, IVT, Tmp2);
1469 // Store the float to memory, then load the sign part out as an integer.
1470 MVT LoadTy = TLI.getPointerTy();
1471 // First create a temporary that is aligned for both the load and store.
1472 SDValue StackPtr = DAG.CreateStackTemporary(FloatVT, LoadTy);
1473 // Then store the float to it.
1475 DAG.getStore(DAG.getEntryNode(), dl, Tmp2, StackPtr, MachinePointerInfo(),
1477 if (TLI.isBigEndian()) {
1478 assert(FloatVT.isByteSized() && "Unsupported floating point type!");
1479 // Load out a legal integer with the same sign bit as the float.
1480 SignBit = DAG.getLoad(LoadTy, dl, Ch, StackPtr, MachinePointerInfo(),
1481 false, false, false, 0);
1482 } else { // Little endian
1483 SDValue LoadPtr = StackPtr;
1484 // The float may be wider than the integer we are going to load. Advance
1485 // the pointer so that the loaded integer will contain the sign bit.
1486 unsigned Strides = (FloatVT.getSizeInBits()-1)/LoadTy.getSizeInBits();
1487 unsigned ByteOffset = (Strides * LoadTy.getSizeInBits()) / 8;
1488 LoadPtr = DAG.getNode(ISD::ADD, dl, LoadPtr.getValueType(),
1489 LoadPtr, DAG.getIntPtrConstant(ByteOffset));
1490 // Load a legal integer containing the sign bit.
1491 SignBit = DAG.getLoad(LoadTy, dl, Ch, LoadPtr, MachinePointerInfo(),
1492 false, false, false, 0);
1493 // Move the sign bit to the top bit of the loaded integer.
1494 unsigned BitShift = LoadTy.getSizeInBits() -
1495 (FloatVT.getSizeInBits() - 8 * ByteOffset);
1496 assert(BitShift < LoadTy.getSizeInBits() && "Pointer advanced wrong?");
1498 SignBit = DAG.getNode(ISD::SHL, dl, LoadTy, SignBit,
1499 DAG.getConstant(BitShift,
1500 TLI.getShiftAmountTy(SignBit.getValueType())));
1503 // Now get the sign bit proper, by seeing whether the value is negative.
1504 SignBit = DAG.getSetCC(dl, TLI.getSetCCResultType(SignBit.getValueType()),
1505 SignBit, DAG.getConstant(0, SignBit.getValueType()),
1507 // Get the absolute value of the result.
1508 SDValue AbsVal = DAG.getNode(ISD::FABS, dl, Tmp1.getValueType(), Tmp1);
1509 // Select between the nabs and abs value based on the sign bit of
1511 return DAG.getNode(ISD::SELECT, dl, AbsVal.getValueType(), SignBit,
1512 DAG.getNode(ISD::FNEG, dl, AbsVal.getValueType(), AbsVal),
1516 void SelectionDAGLegalize::ExpandDYNAMIC_STACKALLOC(SDNode* Node,
1517 SmallVectorImpl<SDValue> &Results) {
1518 unsigned SPReg = TLI.getStackPointerRegisterToSaveRestore();
1519 assert(SPReg && "Target cannot require DYNAMIC_STACKALLOC expansion and"
1520 " not tell us which reg is the stack pointer!");
1521 DebugLoc dl = Node->getDebugLoc();
1522 EVT VT = Node->getValueType(0);
1523 SDValue Tmp1 = SDValue(Node, 0);
1524 SDValue Tmp2 = SDValue(Node, 1);
1525 SDValue Tmp3 = Node->getOperand(2);
1526 SDValue Chain = Tmp1.getOperand(0);
1528 // Chain the dynamic stack allocation so that it doesn't modify the stack
1529 // pointer when other instructions are using the stack.
1530 Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(0, true));
1532 SDValue Size = Tmp2.getOperand(1);
1533 SDValue SP = DAG.getCopyFromReg(Chain, dl, SPReg, VT);
1534 Chain = SP.getValue(1);
1535 unsigned Align = cast<ConstantSDNode>(Tmp3)->getZExtValue();
1536 unsigned StackAlign = TM.getFrameLowering()->getStackAlignment();
1537 if (Align > StackAlign)
1538 SP = DAG.getNode(ISD::AND, dl, VT, SP,
1539 DAG.getConstant(-(uint64_t)Align, VT));
1540 Tmp1 = DAG.getNode(ISD::SUB, dl, VT, SP, Size); // Value
1541 Chain = DAG.getCopyToReg(Chain, dl, SPReg, Tmp1); // Output chain
1543 Tmp2 = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(0, true),
1544 DAG.getIntPtrConstant(0, true), SDValue());
1546 Results.push_back(Tmp1);
1547 Results.push_back(Tmp2);
1550 /// LegalizeSetCCCondCode - Legalize a SETCC with given LHS and RHS and
1551 /// condition code CC on the current target. This routine expands SETCC with
1552 /// illegal condition code into AND / OR of multiple SETCC values.
1553 void SelectionDAGLegalize::LegalizeSetCCCondCode(EVT VT,
1554 SDValue &LHS, SDValue &RHS,
1557 EVT OpVT = LHS.getValueType();
1558 ISD::CondCode CCCode = cast<CondCodeSDNode>(CC)->get();
1559 switch (TLI.getCondCodeAction(CCCode, OpVT)) {
1560 default: assert(0 && "Unknown condition code action!");
1561 case TargetLowering::Legal:
1564 case TargetLowering::Expand: {
1565 ISD::CondCode CC1 = ISD::SETCC_INVALID, CC2 = ISD::SETCC_INVALID;
1568 default: assert(0 && "Don't know how to expand this condition!");
1569 case ISD::SETOEQ: CC1 = ISD::SETEQ; CC2 = ISD::SETO; Opc = ISD::AND; break;
1570 case ISD::SETOGT: CC1 = ISD::SETGT; CC2 = ISD::SETO; Opc = ISD::AND; break;
1571 case ISD::SETOGE: CC1 = ISD::SETGE; CC2 = ISD::SETO; Opc = ISD::AND; break;
1572 case ISD::SETOLT: CC1 = ISD::SETLT; CC2 = ISD::SETO; Opc = ISD::AND; break;
1573 case ISD::SETOLE: CC1 = ISD::SETLE; CC2 = ISD::SETO; Opc = ISD::AND; break;
1574 case ISD::SETONE: CC1 = ISD::SETNE; CC2 = ISD::SETO; Opc = ISD::AND; break;
1575 case ISD::SETUEQ: CC1 = ISD::SETEQ; CC2 = ISD::SETUO; Opc = ISD::OR; break;
1576 case ISD::SETUGT: CC1 = ISD::SETGT; CC2 = ISD::SETUO; Opc = ISD::OR; break;
1577 case ISD::SETUGE: CC1 = ISD::SETGE; CC2 = ISD::SETUO; Opc = ISD::OR; break;
1578 case ISD::SETULT: CC1 = ISD::SETLT; CC2 = ISD::SETUO; Opc = ISD::OR; break;
1579 case ISD::SETULE: CC1 = ISD::SETLE; CC2 = ISD::SETUO; Opc = ISD::OR; break;
1580 case ISD::SETUNE: CC1 = ISD::SETNE; CC2 = ISD::SETUO; Opc = ISD::OR; break;
1581 // FIXME: Implement more expansions.
1584 SDValue SetCC1 = DAG.getSetCC(dl, VT, LHS, RHS, CC1);
1585 SDValue SetCC2 = DAG.getSetCC(dl, VT, LHS, RHS, CC2);
1586 LHS = DAG.getNode(Opc, dl, VT, SetCC1, SetCC2);
1594 /// EmitStackConvert - Emit a store/load combination to the stack. This stores
1595 /// SrcOp to a stack slot of type SlotVT, truncating it if needed. It then does
1596 /// a load from the stack slot to DestVT, extending it if needed.
1597 /// The resultant code need not be legal.
1598 SDValue SelectionDAGLegalize::EmitStackConvert(SDValue SrcOp,
1602 // Create the stack frame object.
1604 TLI.getTargetData()->getPrefTypeAlignment(SrcOp.getValueType().
1605 getTypeForEVT(*DAG.getContext()));
1606 SDValue FIPtr = DAG.CreateStackTemporary(SlotVT, SrcAlign);
1608 FrameIndexSDNode *StackPtrFI = cast<FrameIndexSDNode>(FIPtr);
1609 int SPFI = StackPtrFI->getIndex();
1610 MachinePointerInfo PtrInfo = MachinePointerInfo::getFixedStack(SPFI);
1612 unsigned SrcSize = SrcOp.getValueType().getSizeInBits();
1613 unsigned SlotSize = SlotVT.getSizeInBits();
1614 unsigned DestSize = DestVT.getSizeInBits();
1615 Type *DestType = DestVT.getTypeForEVT(*DAG.getContext());
1616 unsigned DestAlign = TLI.getTargetData()->getPrefTypeAlignment(DestType);
1618 // Emit a store to the stack slot. Use a truncstore if the input value is
1619 // later than DestVT.
1622 if (SrcSize > SlotSize)
1623 Store = DAG.getTruncStore(DAG.getEntryNode(), dl, SrcOp, FIPtr,
1624 PtrInfo, SlotVT, false, false, SrcAlign);
1626 assert(SrcSize == SlotSize && "Invalid store");
1627 Store = DAG.getStore(DAG.getEntryNode(), dl, SrcOp, FIPtr,
1628 PtrInfo, false, false, SrcAlign);
1631 // Result is a load from the stack slot.
1632 if (SlotSize == DestSize)
1633 return DAG.getLoad(DestVT, dl, Store, FIPtr, PtrInfo,
1634 false, false, false, DestAlign);
1636 assert(SlotSize < DestSize && "Unknown extension!");
1637 return DAG.getExtLoad(ISD::EXTLOAD, dl, DestVT, Store, FIPtr,
1638 PtrInfo, SlotVT, false, false, DestAlign);
1641 SDValue SelectionDAGLegalize::ExpandSCALAR_TO_VECTOR(SDNode *Node) {
1642 DebugLoc dl = Node->getDebugLoc();
1643 // Create a vector sized/aligned stack slot, store the value to element #0,
1644 // then load the whole vector back out.
1645 SDValue StackPtr = DAG.CreateStackTemporary(Node->getValueType(0));
1647 FrameIndexSDNode *StackPtrFI = cast<FrameIndexSDNode>(StackPtr);
1648 int SPFI = StackPtrFI->getIndex();
1650 SDValue Ch = DAG.getTruncStore(DAG.getEntryNode(), dl, Node->getOperand(0),
1652 MachinePointerInfo::getFixedStack(SPFI),
1653 Node->getValueType(0).getVectorElementType(),
1655 return DAG.getLoad(Node->getValueType(0), dl, Ch, StackPtr,
1656 MachinePointerInfo::getFixedStack(SPFI),
1657 false, false, false, 0);
1661 /// ExpandBUILD_VECTOR - Expand a BUILD_VECTOR node on targets that don't
1662 /// support the operation, but do support the resultant vector type.
1663 SDValue SelectionDAGLegalize::ExpandBUILD_VECTOR(SDNode *Node) {
1664 unsigned NumElems = Node->getNumOperands();
1665 SDValue Value1, Value2;
1666 DebugLoc dl = Node->getDebugLoc();
1667 EVT VT = Node->getValueType(0);
1668 EVT OpVT = Node->getOperand(0).getValueType();
1669 EVT EltVT = VT.getVectorElementType();
1671 // If the only non-undef value is the low element, turn this into a
1672 // SCALAR_TO_VECTOR node. If this is { X, X, X, X }, determine X.
1673 bool isOnlyLowElement = true;
1674 bool MoreThanTwoValues = false;
1675 bool isConstant = true;
1676 for (unsigned i = 0; i < NumElems; ++i) {
1677 SDValue V = Node->getOperand(i);
1678 if (V.getOpcode() == ISD::UNDEF)
1681 isOnlyLowElement = false;
1682 if (!isa<ConstantFPSDNode>(V) && !isa<ConstantSDNode>(V))
1685 if (!Value1.getNode()) {
1687 } else if (!Value2.getNode()) {
1690 } else if (V != Value1 && V != Value2) {
1691 MoreThanTwoValues = true;
1695 if (!Value1.getNode())
1696 return DAG.getUNDEF(VT);
1698 if (isOnlyLowElement)
1699 return DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Node->getOperand(0));
1701 // If all elements are constants, create a load from the constant pool.
1703 std::vector<Constant*> CV;
1704 for (unsigned i = 0, e = NumElems; i != e; ++i) {
1705 if (ConstantFPSDNode *V =
1706 dyn_cast<ConstantFPSDNode>(Node->getOperand(i))) {
1707 CV.push_back(const_cast<ConstantFP *>(V->getConstantFPValue()));
1708 } else if (ConstantSDNode *V =
1709 dyn_cast<ConstantSDNode>(Node->getOperand(i))) {
1711 CV.push_back(const_cast<ConstantInt *>(V->getConstantIntValue()));
1713 // If OpVT and EltVT don't match, EltVT is not legal and the
1714 // element values have been promoted/truncated earlier. Undo this;
1715 // we don't want a v16i8 to become a v16i32 for example.
1716 const ConstantInt *CI = V->getConstantIntValue();
1717 CV.push_back(ConstantInt::get(EltVT.getTypeForEVT(*DAG.getContext()),
1718 CI->getZExtValue()));
1721 assert(Node->getOperand(i).getOpcode() == ISD::UNDEF);
1722 Type *OpNTy = EltVT.getTypeForEVT(*DAG.getContext());
1723 CV.push_back(UndefValue::get(OpNTy));
1726 Constant *CP = ConstantVector::get(CV);
1727 SDValue CPIdx = DAG.getConstantPool(CP, TLI.getPointerTy());
1728 unsigned Alignment = cast<ConstantPoolSDNode>(CPIdx)->getAlignment();
1729 return DAG.getLoad(VT, dl, DAG.getEntryNode(), CPIdx,
1730 MachinePointerInfo::getConstantPool(),
1731 false, false, false, Alignment);
1734 if (!MoreThanTwoValues) {
1735 SmallVector<int, 8> ShuffleVec(NumElems, -1);
1736 for (unsigned i = 0; i < NumElems; ++i) {
1737 SDValue V = Node->getOperand(i);
1738 if (V.getOpcode() == ISD::UNDEF)
1740 ShuffleVec[i] = V == Value1 ? 0 : NumElems;
1742 if (TLI.isShuffleMaskLegal(ShuffleVec, Node->getValueType(0))) {
1743 // Get the splatted value into the low element of a vector register.
1744 SDValue Vec1 = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Value1);
1746 if (Value2.getNode())
1747 Vec2 = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Value2);
1749 Vec2 = DAG.getUNDEF(VT);
1751 // Return shuffle(LowValVec, undef, <0,0,0,0>)
1752 return DAG.getVectorShuffle(VT, dl, Vec1, Vec2, ShuffleVec.data());
1756 // Otherwise, we can't handle this case efficiently.
1757 return ExpandVectorBuildThroughStack(Node);
1760 // ExpandLibCall - Expand a node into a call to a libcall. If the result value
1761 // does not fit into a register, return the lo part and set the hi part to the
1762 // by-reg argument. If it does fit into a single register, return the result
1763 // and leave the Hi part unset.
1764 SDValue SelectionDAGLegalize::ExpandLibCall(RTLIB::Libcall LC, SDNode *Node,
1766 // The input chain to this libcall is the entry node of the function.
1767 // Legalizing the call will automatically add the previous call to the
1769 SDValue InChain = DAG.getEntryNode();
1771 TargetLowering::ArgListTy Args;
1772 TargetLowering::ArgListEntry Entry;
1773 for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i) {
1774 EVT ArgVT = Node->getOperand(i).getValueType();
1775 Type *ArgTy = ArgVT.getTypeForEVT(*DAG.getContext());
1776 Entry.Node = Node->getOperand(i); Entry.Ty = ArgTy;
1777 Entry.isSExt = isSigned;
1778 Entry.isZExt = !isSigned;
1779 Args.push_back(Entry);
1781 SDValue Callee = DAG.getExternalSymbol(TLI.getLibcallName(LC),
1782 TLI.getPointerTy());
1784 Type *RetTy = Node->getValueType(0).getTypeForEVT(*DAG.getContext());
1786 // isTailCall may be true since the callee does not reference caller stack
1787 // frame. Check if it's in the right position.
1788 bool isTailCall = isInTailCallPosition(DAG, Node, TLI);
1789 std::pair<SDValue, SDValue> CallInfo =
1790 TLI.LowerCallTo(InChain, RetTy, isSigned, !isSigned, false, false,
1791 0, TLI.getLibcallCallingConv(LC), isTailCall,
1792 /*isReturnValueUsed=*/true,
1793 Callee, Args, DAG, Node->getDebugLoc());
1795 if (!CallInfo.second.getNode())
1796 // It's a tailcall, return the chain (which is the DAG root).
1797 return DAG.getRoot();
1799 return CallInfo.first;
1802 /// ExpandLibCall - Generate a libcall taking the given operands as arguments
1803 /// and returning a result of type RetVT.
1804 SDValue SelectionDAGLegalize::ExpandLibCall(RTLIB::Libcall LC, EVT RetVT,
1805 const SDValue *Ops, unsigned NumOps,
1806 bool isSigned, DebugLoc dl) {
1807 TargetLowering::ArgListTy Args;
1808 Args.reserve(NumOps);
1810 TargetLowering::ArgListEntry Entry;
1811 for (unsigned i = 0; i != NumOps; ++i) {
1812 Entry.Node = Ops[i];
1813 Entry.Ty = Entry.Node.getValueType().getTypeForEVT(*DAG.getContext());
1814 Entry.isSExt = isSigned;
1815 Entry.isZExt = !isSigned;
1816 Args.push_back(Entry);
1818 SDValue Callee = DAG.getExternalSymbol(TLI.getLibcallName(LC),
1819 TLI.getPointerTy());
1821 Type *RetTy = RetVT.getTypeForEVT(*DAG.getContext());
1822 std::pair<SDValue,SDValue> CallInfo =
1823 TLI.LowerCallTo(DAG.getEntryNode(), RetTy, isSigned, !isSigned, false,
1824 false, 0, TLI.getLibcallCallingConv(LC), false,
1825 /*isReturnValueUsed=*/true,
1826 Callee, Args, DAG, dl);
1828 return CallInfo.first;
1831 // ExpandChainLibCall - Expand a node into a call to a libcall. Similar to
1832 // ExpandLibCall except that the first operand is the in-chain.
1833 std::pair<SDValue, SDValue>
1834 SelectionDAGLegalize::ExpandChainLibCall(RTLIB::Libcall LC,
1837 SDValue InChain = Node->getOperand(0);
1839 TargetLowering::ArgListTy Args;
1840 TargetLowering::ArgListEntry Entry;
1841 for (unsigned i = 1, e = Node->getNumOperands(); i != e; ++i) {
1842 EVT ArgVT = Node->getOperand(i).getValueType();
1843 Type *ArgTy = ArgVT.getTypeForEVT(*DAG.getContext());
1844 Entry.Node = Node->getOperand(i);
1846 Entry.isSExt = isSigned;
1847 Entry.isZExt = !isSigned;
1848 Args.push_back(Entry);
1850 SDValue Callee = DAG.getExternalSymbol(TLI.getLibcallName(LC),
1851 TLI.getPointerTy());
1853 Type *RetTy = Node->getValueType(0).getTypeForEVT(*DAG.getContext());
1854 std::pair<SDValue, SDValue> CallInfo =
1855 TLI.LowerCallTo(InChain, RetTy, isSigned, !isSigned, false, false,
1856 0, TLI.getLibcallCallingConv(LC), /*isTailCall=*/false,
1857 /*isReturnValueUsed=*/true,
1858 Callee, Args, DAG, Node->getDebugLoc());
1863 SDValue SelectionDAGLegalize::ExpandFPLibCall(SDNode* Node,
1864 RTLIB::Libcall Call_F32,
1865 RTLIB::Libcall Call_F64,
1866 RTLIB::Libcall Call_F80,
1867 RTLIB::Libcall Call_PPCF128) {
1869 switch (Node->getValueType(0).getSimpleVT().SimpleTy) {
1870 default: assert(0 && "Unexpected request for libcall!");
1871 case MVT::f32: LC = Call_F32; break;
1872 case MVT::f64: LC = Call_F64; break;
1873 case MVT::f80: LC = Call_F80; break;
1874 case MVT::ppcf128: LC = Call_PPCF128; break;
1876 return ExpandLibCall(LC, Node, false);
1879 SDValue SelectionDAGLegalize::ExpandIntLibCall(SDNode* Node, bool isSigned,
1880 RTLIB::Libcall Call_I8,
1881 RTLIB::Libcall Call_I16,
1882 RTLIB::Libcall Call_I32,
1883 RTLIB::Libcall Call_I64,
1884 RTLIB::Libcall Call_I128) {
1886 switch (Node->getValueType(0).getSimpleVT().SimpleTy) {
1887 default: assert(0 && "Unexpected request for libcall!");
1888 case MVT::i8: LC = Call_I8; break;
1889 case MVT::i16: LC = Call_I16; break;
1890 case MVT::i32: LC = Call_I32; break;
1891 case MVT::i64: LC = Call_I64; break;
1892 case MVT::i128: LC = Call_I128; break;
1894 return ExpandLibCall(LC, Node, isSigned);
1897 /// isDivRemLibcallAvailable - Return true if divmod libcall is available.
1898 static bool isDivRemLibcallAvailable(SDNode *Node, bool isSigned,
1899 const TargetLowering &TLI) {
1901 switch (Node->getValueType(0).getSimpleVT().SimpleTy) {
1902 default: assert(0 && "Unexpected request for libcall!");
1903 case MVT::i8: LC= isSigned ? RTLIB::SDIVREM_I8 : RTLIB::UDIVREM_I8; break;
1904 case MVT::i16: LC= isSigned ? RTLIB::SDIVREM_I16 : RTLIB::UDIVREM_I16; break;
1905 case MVT::i32: LC= isSigned ? RTLIB::SDIVREM_I32 : RTLIB::UDIVREM_I32; break;
1906 case MVT::i64: LC= isSigned ? RTLIB::SDIVREM_I64 : RTLIB::UDIVREM_I64; break;
1907 case MVT::i128: LC= isSigned ? RTLIB::SDIVREM_I128:RTLIB::UDIVREM_I128; break;
1910 return TLI.getLibcallName(LC) != 0;
1913 /// UseDivRem - Only issue divrem libcall if both quotient and remainder are
1915 static bool UseDivRem(SDNode *Node, bool isSigned, bool isDIV) {
1916 unsigned OtherOpcode = 0;
1918 OtherOpcode = isDIV ? ISD::SREM : ISD::SDIV;
1920 OtherOpcode = isDIV ? ISD::UREM : ISD::UDIV;
1922 SDValue Op0 = Node->getOperand(0);
1923 SDValue Op1 = Node->getOperand(1);
1924 for (SDNode::use_iterator UI = Op0.getNode()->use_begin(),
1925 UE = Op0.getNode()->use_end(); UI != UE; ++UI) {
1929 if (User->getOpcode() == OtherOpcode &&
1930 User->getOperand(0) == Op0 &&
1931 User->getOperand(1) == Op1)
1937 /// ExpandDivRemLibCall - Issue libcalls to __{u}divmod to compute div / rem
1940 SelectionDAGLegalize::ExpandDivRemLibCall(SDNode *Node,
1941 SmallVectorImpl<SDValue> &Results) {
1942 unsigned Opcode = Node->getOpcode();
1943 bool isSigned = Opcode == ISD::SDIVREM;
1946 switch (Node->getValueType(0).getSimpleVT().SimpleTy) {
1947 default: assert(0 && "Unexpected request for libcall!");
1948 case MVT::i8: LC= isSigned ? RTLIB::SDIVREM_I8 : RTLIB::UDIVREM_I8; break;
1949 case MVT::i16: LC= isSigned ? RTLIB::SDIVREM_I16 : RTLIB::UDIVREM_I16; break;
1950 case MVT::i32: LC= isSigned ? RTLIB::SDIVREM_I32 : RTLIB::UDIVREM_I32; break;
1951 case MVT::i64: LC= isSigned ? RTLIB::SDIVREM_I64 : RTLIB::UDIVREM_I64; break;
1952 case MVT::i128: LC= isSigned ? RTLIB::SDIVREM_I128:RTLIB::UDIVREM_I128; break;
1955 // The input chain to this libcall is the entry node of the function.
1956 // Legalizing the call will automatically add the previous call to the
1958 SDValue InChain = DAG.getEntryNode();
1960 EVT RetVT = Node->getValueType(0);
1961 Type *RetTy = RetVT.getTypeForEVT(*DAG.getContext());
1963 TargetLowering::ArgListTy Args;
1964 TargetLowering::ArgListEntry Entry;
1965 for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i) {
1966 EVT ArgVT = Node->getOperand(i).getValueType();
1967 Type *ArgTy = ArgVT.getTypeForEVT(*DAG.getContext());
1968 Entry.Node = Node->getOperand(i); Entry.Ty = ArgTy;
1969 Entry.isSExt = isSigned;
1970 Entry.isZExt = !isSigned;
1971 Args.push_back(Entry);
1974 // Also pass the return address of the remainder.
1975 SDValue FIPtr = DAG.CreateStackTemporary(RetVT);
1977 Entry.Ty = RetTy->getPointerTo();
1978 Entry.isSExt = isSigned;
1979 Entry.isZExt = !isSigned;
1980 Args.push_back(Entry);
1982 SDValue Callee = DAG.getExternalSymbol(TLI.getLibcallName(LC),
1983 TLI.getPointerTy());
1985 DebugLoc dl = Node->getDebugLoc();
1986 std::pair<SDValue, SDValue> CallInfo =
1987 TLI.LowerCallTo(InChain, RetTy, isSigned, !isSigned, false, false,
1988 0, TLI.getLibcallCallingConv(LC), /*isTailCall=*/false,
1989 /*isReturnValueUsed=*/true, Callee, Args, DAG, dl);
1991 // Remainder is loaded back from the stack frame.
1992 SDValue Rem = DAG.getLoad(RetVT, dl, CallInfo.second, FIPtr,
1993 MachinePointerInfo(), false, false, false, 0);
1994 Results.push_back(CallInfo.first);
1995 Results.push_back(Rem);
1998 /// ExpandLegalINT_TO_FP - This function is responsible for legalizing a
1999 /// INT_TO_FP operation of the specified operand when the target requests that
2000 /// we expand it. At this point, we know that the result and operand types are
2001 /// legal for the target.
2002 SDValue SelectionDAGLegalize::ExpandLegalINT_TO_FP(bool isSigned,
2006 if (Op0.getValueType() == MVT::i32) {
2007 // simple 32-bit [signed|unsigned] integer to float/double expansion
2009 // Get the stack frame index of a 8 byte buffer.
2010 SDValue StackSlot = DAG.CreateStackTemporary(MVT::f64);
2012 // word offset constant for Hi/Lo address computation
2013 SDValue WordOff = DAG.getConstant(sizeof(int), TLI.getPointerTy());
2014 // set up Hi and Lo (into buffer) address based on endian
2015 SDValue Hi = StackSlot;
2016 SDValue Lo = DAG.getNode(ISD::ADD, dl,
2017 TLI.getPointerTy(), StackSlot, WordOff);
2018 if (TLI.isLittleEndian())
2021 // if signed map to unsigned space
2024 // constant used to invert sign bit (signed to unsigned mapping)
2025 SDValue SignBit = DAG.getConstant(0x80000000u, MVT::i32);
2026 Op0Mapped = DAG.getNode(ISD::XOR, dl, MVT::i32, Op0, SignBit);
2030 // store the lo of the constructed double - based on integer input
2031 SDValue Store1 = DAG.getStore(DAG.getEntryNode(), dl,
2032 Op0Mapped, Lo, MachinePointerInfo(),
2034 // initial hi portion of constructed double
2035 SDValue InitialHi = DAG.getConstant(0x43300000u, MVT::i32);
2036 // store the hi of the constructed double - biased exponent
2037 SDValue Store2 = DAG.getStore(Store1, dl, InitialHi, Hi,
2038 MachinePointerInfo(),
2040 // load the constructed double
2041 SDValue Load = DAG.getLoad(MVT::f64, dl, Store2, StackSlot,
2042 MachinePointerInfo(), false, false, false, 0);
2043 // FP constant to bias correct the final result
2044 SDValue Bias = DAG.getConstantFP(isSigned ?
2045 BitsToDouble(0x4330000080000000ULL) :
2046 BitsToDouble(0x4330000000000000ULL),
2048 // subtract the bias
2049 SDValue Sub = DAG.getNode(ISD::FSUB, dl, MVT::f64, Load, Bias);
2052 // handle final rounding
2053 if (DestVT == MVT::f64) {
2056 } else if (DestVT.bitsLT(MVT::f64)) {
2057 Result = DAG.getNode(ISD::FP_ROUND, dl, DestVT, Sub,
2058 DAG.getIntPtrConstant(0));
2059 } else if (DestVT.bitsGT(MVT::f64)) {
2060 Result = DAG.getNode(ISD::FP_EXTEND, dl, DestVT, Sub);
2064 assert(!isSigned && "Legalize cannot Expand SINT_TO_FP for i64 yet");
2065 // Code below here assumes !isSigned without checking again.
2067 // Implementation of unsigned i64 to f64 following the algorithm in
2068 // __floatundidf in compiler_rt. This implementation has the advantage
2069 // of performing rounding correctly, both in the default rounding mode
2070 // and in all alternate rounding modes.
2071 // TODO: Generalize this for use with other types.
2072 if (Op0.getValueType() == MVT::i64 && DestVT == MVT::f64) {
2074 DAG.getConstant(UINT64_C(0x4330000000000000), MVT::i64);
2075 SDValue TwoP84PlusTwoP52 =
2076 DAG.getConstantFP(BitsToDouble(UINT64_C(0x4530000000100000)), MVT::f64);
2078 DAG.getConstant(UINT64_C(0x4530000000000000), MVT::i64);
2080 SDValue Lo = DAG.getZeroExtendInReg(Op0, dl, MVT::i32);
2081 SDValue Hi = DAG.getNode(ISD::SRL, dl, MVT::i64, Op0,
2082 DAG.getConstant(32, MVT::i64));
2083 SDValue LoOr = DAG.getNode(ISD::OR, dl, MVT::i64, Lo, TwoP52);
2084 SDValue HiOr = DAG.getNode(ISD::OR, dl, MVT::i64, Hi, TwoP84);
2085 SDValue LoFlt = DAG.getNode(ISD::BITCAST, dl, MVT::f64, LoOr);
2086 SDValue HiFlt = DAG.getNode(ISD::BITCAST, dl, MVT::f64, HiOr);
2087 SDValue HiSub = DAG.getNode(ISD::FSUB, dl, MVT::f64, HiFlt,
2089 return DAG.getNode(ISD::FADD, dl, MVT::f64, LoFlt, HiSub);
2092 // Implementation of unsigned i64 to f32.
2093 // TODO: Generalize this for use with other types.
2094 if (Op0.getValueType() == MVT::i64 && DestVT == MVT::f32) {
2095 // For unsigned conversions, convert them to signed conversions using the
2096 // algorithm from the x86_64 __floatundidf in compiler_rt.
2098 SDValue Fast = DAG.getNode(ISD::SINT_TO_FP, dl, MVT::f32, Op0);
2100 SDValue ShiftConst =
2101 DAG.getConstant(1, TLI.getShiftAmountTy(Op0.getValueType()));
2102 SDValue Shr = DAG.getNode(ISD::SRL, dl, MVT::i64, Op0, ShiftConst);
2103 SDValue AndConst = DAG.getConstant(1, MVT::i64);
2104 SDValue And = DAG.getNode(ISD::AND, dl, MVT::i64, Op0, AndConst);
2105 SDValue Or = DAG.getNode(ISD::OR, dl, MVT::i64, And, Shr);
2107 SDValue SignCvt = DAG.getNode(ISD::SINT_TO_FP, dl, MVT::f32, Or);
2108 SDValue Slow = DAG.getNode(ISD::FADD, dl, MVT::f32, SignCvt, SignCvt);
2110 // TODO: This really should be implemented using a branch rather than a
2111 // select. We happen to get lucky and machinesink does the right
2112 // thing most of the time. This would be a good candidate for a
2113 //pseudo-op, or, even better, for whole-function isel.
2114 SDValue SignBitTest = DAG.getSetCC(dl, TLI.getSetCCResultType(MVT::i64),
2115 Op0, DAG.getConstant(0, MVT::i64), ISD::SETLT);
2116 return DAG.getNode(ISD::SELECT, dl, MVT::f32, SignBitTest, Slow, Fast);
2119 // Otherwise, implement the fully general conversion.
2121 SDValue And = DAG.getNode(ISD::AND, dl, MVT::i64, Op0,
2122 DAG.getConstant(UINT64_C(0xfffffffffffff800), MVT::i64));
2123 SDValue Or = DAG.getNode(ISD::OR, dl, MVT::i64, And,
2124 DAG.getConstant(UINT64_C(0x800), MVT::i64));
2125 SDValue And2 = DAG.getNode(ISD::AND, dl, MVT::i64, Op0,
2126 DAG.getConstant(UINT64_C(0x7ff), MVT::i64));
2127 SDValue Ne = DAG.getSetCC(dl, TLI.getSetCCResultType(MVT::i64),
2128 And2, DAG.getConstant(UINT64_C(0), MVT::i64), ISD::SETNE);
2129 SDValue Sel = DAG.getNode(ISD::SELECT, dl, MVT::i64, Ne, Or, Op0);
2130 SDValue Ge = DAG.getSetCC(dl, TLI.getSetCCResultType(MVT::i64),
2131 Op0, DAG.getConstant(UINT64_C(0x0020000000000000), MVT::i64),
2133 SDValue Sel2 = DAG.getNode(ISD::SELECT, dl, MVT::i64, Ge, Sel, Op0);
2134 EVT SHVT = TLI.getShiftAmountTy(Sel2.getValueType());
2136 SDValue Sh = DAG.getNode(ISD::SRL, dl, MVT::i64, Sel2,
2137 DAG.getConstant(32, SHVT));
2138 SDValue Trunc = DAG.getNode(ISD::TRUNCATE, dl, MVT::i32, Sh);
2139 SDValue Fcvt = DAG.getNode(ISD::UINT_TO_FP, dl, MVT::f64, Trunc);
2141 DAG.getConstantFP(BitsToDouble(UINT64_C(0x41f0000000000000)), MVT::f64);
2142 SDValue Fmul = DAG.getNode(ISD::FMUL, dl, MVT::f64, TwoP32, Fcvt);
2143 SDValue Lo = DAG.getNode(ISD::TRUNCATE, dl, MVT::i32, Sel2);
2144 SDValue Fcvt2 = DAG.getNode(ISD::UINT_TO_FP, dl, MVT::f64, Lo);
2145 SDValue Fadd = DAG.getNode(ISD::FADD, dl, MVT::f64, Fmul, Fcvt2);
2146 return DAG.getNode(ISD::FP_ROUND, dl, MVT::f32, Fadd,
2147 DAG.getIntPtrConstant(0));
2150 SDValue Tmp1 = DAG.getNode(ISD::SINT_TO_FP, dl, DestVT, Op0);
2152 SDValue SignSet = DAG.getSetCC(dl, TLI.getSetCCResultType(Op0.getValueType()),
2153 Op0, DAG.getConstant(0, Op0.getValueType()),
2155 SDValue Zero = DAG.getIntPtrConstant(0), Four = DAG.getIntPtrConstant(4);
2156 SDValue CstOffset = DAG.getNode(ISD::SELECT, dl, Zero.getValueType(),
2157 SignSet, Four, Zero);
2159 // If the sign bit of the integer is set, the large number will be treated
2160 // as a negative number. To counteract this, the dynamic code adds an
2161 // offset depending on the data type.
2163 switch (Op0.getValueType().getSimpleVT().SimpleTy) {
2164 default: assert(0 && "Unsupported integer type!");
2165 case MVT::i8 : FF = 0x43800000ULL; break; // 2^8 (as a float)
2166 case MVT::i16: FF = 0x47800000ULL; break; // 2^16 (as a float)
2167 case MVT::i32: FF = 0x4F800000ULL; break; // 2^32 (as a float)
2168 case MVT::i64: FF = 0x5F800000ULL; break; // 2^64 (as a float)
2170 if (TLI.isLittleEndian()) FF <<= 32;
2171 Constant *FudgeFactor = ConstantInt::get(
2172 Type::getInt64Ty(*DAG.getContext()), FF);
2174 SDValue CPIdx = DAG.getConstantPool(FudgeFactor, TLI.getPointerTy());
2175 unsigned Alignment = cast<ConstantPoolSDNode>(CPIdx)->getAlignment();
2176 CPIdx = DAG.getNode(ISD::ADD, dl, TLI.getPointerTy(), CPIdx, CstOffset);
2177 Alignment = std::min(Alignment, 4u);
2179 if (DestVT == MVT::f32)
2180 FudgeInReg = DAG.getLoad(MVT::f32, dl, DAG.getEntryNode(), CPIdx,
2181 MachinePointerInfo::getConstantPool(),
2182 false, false, false, Alignment);
2184 SDValue Load = DAG.getExtLoad(ISD::EXTLOAD, dl, DestVT,
2185 DAG.getEntryNode(), CPIdx,
2186 MachinePointerInfo::getConstantPool(),
2187 MVT::f32, false, false, Alignment);
2188 HandleSDNode Handle(Load);
2189 LegalizeOp(Load.getNode());
2190 FudgeInReg = Handle.getValue();
2193 return DAG.getNode(ISD::FADD, dl, DestVT, Tmp1, FudgeInReg);
2196 /// PromoteLegalINT_TO_FP - This function is responsible for legalizing a
2197 /// *INT_TO_FP operation of the specified operand when the target requests that
2198 /// we promote it. At this point, we know that the result and operand types are
2199 /// legal for the target, and that there is a legal UINT_TO_FP or SINT_TO_FP
2200 /// operation that takes a larger input.
2201 SDValue SelectionDAGLegalize::PromoteLegalINT_TO_FP(SDValue LegalOp,
2205 // First step, figure out the appropriate *INT_TO_FP operation to use.
2206 EVT NewInTy = LegalOp.getValueType();
2208 unsigned OpToUse = 0;
2210 // Scan for the appropriate larger type to use.
2212 NewInTy = (MVT::SimpleValueType)(NewInTy.getSimpleVT().SimpleTy+1);
2213 assert(NewInTy.isInteger() && "Ran out of possibilities!");
2215 // If the target supports SINT_TO_FP of this type, use it.
2216 if (TLI.isOperationLegalOrCustom(ISD::SINT_TO_FP, NewInTy)) {
2217 OpToUse = ISD::SINT_TO_FP;
2220 if (isSigned) continue;
2222 // If the target supports UINT_TO_FP of this type, use it.
2223 if (TLI.isOperationLegalOrCustom(ISD::UINT_TO_FP, NewInTy)) {
2224 OpToUse = ISD::UINT_TO_FP;
2228 // Otherwise, try a larger type.
2231 // Okay, we found the operation and type to use. Zero extend our input to the
2232 // desired type then run the operation on it.
2233 return DAG.getNode(OpToUse, dl, DestVT,
2234 DAG.getNode(isSigned ? ISD::SIGN_EXTEND : ISD::ZERO_EXTEND,
2235 dl, NewInTy, LegalOp));
2238 /// PromoteLegalFP_TO_INT - This function is responsible for legalizing a
2239 /// FP_TO_*INT operation of the specified operand when the target requests that
2240 /// we promote it. At this point, we know that the result and operand types are
2241 /// legal for the target, and that there is a legal FP_TO_UINT or FP_TO_SINT
2242 /// operation that returns a larger result.
2243 SDValue SelectionDAGLegalize::PromoteLegalFP_TO_INT(SDValue LegalOp,
2247 // First step, figure out the appropriate FP_TO*INT operation to use.
2248 EVT NewOutTy = DestVT;
2250 unsigned OpToUse = 0;
2252 // Scan for the appropriate larger type to use.
2254 NewOutTy = (MVT::SimpleValueType)(NewOutTy.getSimpleVT().SimpleTy+1);
2255 assert(NewOutTy.isInteger() && "Ran out of possibilities!");
2257 if (TLI.isOperationLegalOrCustom(ISD::FP_TO_SINT, NewOutTy)) {
2258 OpToUse = ISD::FP_TO_SINT;
2262 if (TLI.isOperationLegalOrCustom(ISD::FP_TO_UINT, NewOutTy)) {
2263 OpToUse = ISD::FP_TO_UINT;
2267 // Otherwise, try a larger type.
2271 // Okay, we found the operation and type to use.
2272 SDValue Operation = DAG.getNode(OpToUse, dl, NewOutTy, LegalOp);
2274 // Truncate the result of the extended FP_TO_*INT operation to the desired
2276 return DAG.getNode(ISD::TRUNCATE, dl, DestVT, Operation);
2279 /// ExpandBSWAP - Open code the operations for BSWAP of the specified operation.
2281 SDValue SelectionDAGLegalize::ExpandBSWAP(SDValue Op, DebugLoc dl) {
2282 EVT VT = Op.getValueType();
2283 EVT SHVT = TLI.getShiftAmountTy(VT);
2284 SDValue Tmp1, Tmp2, Tmp3, Tmp4, Tmp5, Tmp6, Tmp7, Tmp8;
2285 switch (VT.getSimpleVT().SimpleTy) {
2286 default: assert(0 && "Unhandled Expand type in BSWAP!");
2288 Tmp2 = DAG.getNode(ISD::SHL, dl, VT, Op, DAG.getConstant(8, SHVT));
2289 Tmp1 = DAG.getNode(ISD::SRL, dl, VT, Op, DAG.getConstant(8, SHVT));
2290 return DAG.getNode(ISD::OR, dl, VT, Tmp1, Tmp2);
2292 Tmp4 = DAG.getNode(ISD::SHL, dl, VT, Op, DAG.getConstant(24, SHVT));
2293 Tmp3 = DAG.getNode(ISD::SHL, dl, VT, Op, DAG.getConstant(8, SHVT));
2294 Tmp2 = DAG.getNode(ISD::SRL, dl, VT, Op, DAG.getConstant(8, SHVT));
2295 Tmp1 = DAG.getNode(ISD::SRL, dl, VT, Op, DAG.getConstant(24, SHVT));
2296 Tmp3 = DAG.getNode(ISD::AND, dl, VT, Tmp3, DAG.getConstant(0xFF0000, VT));
2297 Tmp2 = DAG.getNode(ISD::AND, dl, VT, Tmp2, DAG.getConstant(0xFF00, VT));
2298 Tmp4 = DAG.getNode(ISD::OR, dl, VT, Tmp4, Tmp3);
2299 Tmp2 = DAG.getNode(ISD::OR, dl, VT, Tmp2, Tmp1);
2300 return DAG.getNode(ISD::OR, dl, VT, Tmp4, Tmp2);
2302 Tmp8 = DAG.getNode(ISD::SHL, dl, VT, Op, DAG.getConstant(56, SHVT));
2303 Tmp7 = DAG.getNode(ISD::SHL, dl, VT, Op, DAG.getConstant(40, SHVT));
2304 Tmp6 = DAG.getNode(ISD::SHL, dl, VT, Op, DAG.getConstant(24, SHVT));
2305 Tmp5 = DAG.getNode(ISD::SHL, dl, VT, Op, DAG.getConstant(8, SHVT));
2306 Tmp4 = DAG.getNode(ISD::SRL, dl, VT, Op, DAG.getConstant(8, SHVT));
2307 Tmp3 = DAG.getNode(ISD::SRL, dl, VT, Op, DAG.getConstant(24, SHVT));
2308 Tmp2 = DAG.getNode(ISD::SRL, dl, VT, Op, DAG.getConstant(40, SHVT));
2309 Tmp1 = DAG.getNode(ISD::SRL, dl, VT, Op, DAG.getConstant(56, SHVT));
2310 Tmp7 = DAG.getNode(ISD::AND, dl, VT, Tmp7, DAG.getConstant(255ULL<<48, VT));
2311 Tmp6 = DAG.getNode(ISD::AND, dl, VT, Tmp6, DAG.getConstant(255ULL<<40, VT));
2312 Tmp5 = DAG.getNode(ISD::AND, dl, VT, Tmp5, DAG.getConstant(255ULL<<32, VT));
2313 Tmp4 = DAG.getNode(ISD::AND, dl, VT, Tmp4, DAG.getConstant(255ULL<<24, VT));
2314 Tmp3 = DAG.getNode(ISD::AND, dl, VT, Tmp3, DAG.getConstant(255ULL<<16, VT));
2315 Tmp2 = DAG.getNode(ISD::AND, dl, VT, Tmp2, DAG.getConstant(255ULL<<8 , VT));
2316 Tmp8 = DAG.getNode(ISD::OR, dl, VT, Tmp8, Tmp7);
2317 Tmp6 = DAG.getNode(ISD::OR, dl, VT, Tmp6, Tmp5);
2318 Tmp4 = DAG.getNode(ISD::OR, dl, VT, Tmp4, Tmp3);
2319 Tmp2 = DAG.getNode(ISD::OR, dl, VT, Tmp2, Tmp1);
2320 Tmp8 = DAG.getNode(ISD::OR, dl, VT, Tmp8, Tmp6);
2321 Tmp4 = DAG.getNode(ISD::OR, dl, VT, Tmp4, Tmp2);
2322 return DAG.getNode(ISD::OR, dl, VT, Tmp8, Tmp4);
2326 /// SplatByte - Distribute ByteVal over NumBits bits.
2327 // FIXME: Move this helper to a common place.
2328 static APInt SplatByte(unsigned NumBits, uint8_t ByteVal) {
2329 APInt Val = APInt(NumBits, ByteVal);
2331 for (unsigned i = NumBits; i > 8; i >>= 1) {
2332 Val = (Val << Shift) | Val;
2338 /// ExpandBitCount - Expand the specified bitcount instruction into operations.
2340 SDValue SelectionDAGLegalize::ExpandBitCount(unsigned Opc, SDValue Op,
2343 default: assert(0 && "Cannot expand this yet!");
2345 EVT VT = Op.getValueType();
2346 EVT ShVT = TLI.getShiftAmountTy(VT);
2347 unsigned Len = VT.getSizeInBits();
2349 assert(VT.isInteger() && Len <= 128 && Len % 8 == 0 &&
2350 "CTPOP not implemented for this type.");
2352 // This is the "best" algorithm from
2353 // http://graphics.stanford.edu/~seander/bithacks.html#CountBitsSetParallel
2355 SDValue Mask55 = DAG.getConstant(SplatByte(Len, 0x55), VT);
2356 SDValue Mask33 = DAG.getConstant(SplatByte(Len, 0x33), VT);
2357 SDValue Mask0F = DAG.getConstant(SplatByte(Len, 0x0F), VT);
2358 SDValue Mask01 = DAG.getConstant(SplatByte(Len, 0x01), VT);
2360 // v = v - ((v >> 1) & 0x55555555...)
2361 Op = DAG.getNode(ISD::SUB, dl, VT, Op,
2362 DAG.getNode(ISD::AND, dl, VT,
2363 DAG.getNode(ISD::SRL, dl, VT, Op,
2364 DAG.getConstant(1, ShVT)),
2366 // v = (v & 0x33333333...) + ((v >> 2) & 0x33333333...)
2367 Op = DAG.getNode(ISD::ADD, dl, VT,
2368 DAG.getNode(ISD::AND, dl, VT, Op, Mask33),
2369 DAG.getNode(ISD::AND, dl, VT,
2370 DAG.getNode(ISD::SRL, dl, VT, Op,
2371 DAG.getConstant(2, ShVT)),
2373 // v = (v + (v >> 4)) & 0x0F0F0F0F...
2374 Op = DAG.getNode(ISD::AND, dl, VT,
2375 DAG.getNode(ISD::ADD, dl, VT, Op,
2376 DAG.getNode(ISD::SRL, dl, VT, Op,
2377 DAG.getConstant(4, ShVT))),
2379 // v = (v * 0x01010101...) >> (Len - 8)
2380 Op = DAG.getNode(ISD::SRL, dl, VT,
2381 DAG.getNode(ISD::MUL, dl, VT, Op, Mask01),
2382 DAG.getConstant(Len - 8, ShVT));
2387 // for now, we do this:
2388 // x = x | (x >> 1);
2389 // x = x | (x >> 2);
2391 // x = x | (x >>16);
2392 // x = x | (x >>32); // for 64-bit input
2393 // return popcount(~x);
2395 // but see also: http://www.hackersdelight.org/HDcode/nlz.cc
2396 EVT VT = Op.getValueType();
2397 EVT ShVT = TLI.getShiftAmountTy(VT);
2398 unsigned len = VT.getSizeInBits();
2399 for (unsigned i = 0; (1U << i) <= (len / 2); ++i) {
2400 SDValue Tmp3 = DAG.getConstant(1ULL << i, ShVT);
2401 Op = DAG.getNode(ISD::OR, dl, VT, Op,
2402 DAG.getNode(ISD::SRL, dl, VT, Op, Tmp3));
2404 Op = DAG.getNOT(dl, Op, VT);
2405 return DAG.getNode(ISD::CTPOP, dl, VT, Op);
2408 // for now, we use: { return popcount(~x & (x - 1)); }
2409 // unless the target has ctlz but not ctpop, in which case we use:
2410 // { return 32 - nlz(~x & (x-1)); }
2411 // see also http://www.hackersdelight.org/HDcode/ntz.cc
2412 EVT VT = Op.getValueType();
2413 SDValue Tmp3 = DAG.getNode(ISD::AND, dl, VT,
2414 DAG.getNOT(dl, Op, VT),
2415 DAG.getNode(ISD::SUB, dl, VT, Op,
2416 DAG.getConstant(1, VT)));
2417 // If ISD::CTLZ is legal and CTPOP isn't, then do that instead.
2418 if (!TLI.isOperationLegalOrCustom(ISD::CTPOP, VT) &&
2419 TLI.isOperationLegalOrCustom(ISD::CTLZ, VT))
2420 return DAG.getNode(ISD::SUB, dl, VT,
2421 DAG.getConstant(VT.getSizeInBits(), VT),
2422 DAG.getNode(ISD::CTLZ, dl, VT, Tmp3));
2423 return DAG.getNode(ISD::CTPOP, dl, VT, Tmp3);
2428 std::pair <SDValue, SDValue> SelectionDAGLegalize::ExpandAtomic(SDNode *Node) {
2429 unsigned Opc = Node->getOpcode();
2430 MVT VT = cast<AtomicSDNode>(Node)->getMemoryVT().getSimpleVT();
2435 llvm_unreachable("Unhandled atomic intrinsic Expand!");
2437 case ISD::ATOMIC_SWAP:
2438 switch (VT.SimpleTy) {
2439 default: llvm_unreachable("Unexpected value type for atomic!");
2440 case MVT::i8: LC = RTLIB::SYNC_LOCK_TEST_AND_SET_1; break;
2441 case MVT::i16: LC = RTLIB::SYNC_LOCK_TEST_AND_SET_2; break;
2442 case MVT::i32: LC = RTLIB::SYNC_LOCK_TEST_AND_SET_4; break;
2443 case MVT::i64: LC = RTLIB::SYNC_LOCK_TEST_AND_SET_8; break;
2446 case ISD::ATOMIC_CMP_SWAP:
2447 switch (VT.SimpleTy) {
2448 default: llvm_unreachable("Unexpected value type for atomic!");
2449 case MVT::i8: LC = RTLIB::SYNC_VAL_COMPARE_AND_SWAP_1; break;
2450 case MVT::i16: LC = RTLIB::SYNC_VAL_COMPARE_AND_SWAP_2; break;
2451 case MVT::i32: LC = RTLIB::SYNC_VAL_COMPARE_AND_SWAP_4; break;
2452 case MVT::i64: LC = RTLIB::SYNC_VAL_COMPARE_AND_SWAP_8; break;
2455 case ISD::ATOMIC_LOAD_ADD:
2456 switch (VT.SimpleTy) {
2457 default: llvm_unreachable("Unexpected value type for atomic!");
2458 case MVT::i8: LC = RTLIB::SYNC_FETCH_AND_ADD_1; break;
2459 case MVT::i16: LC = RTLIB::SYNC_FETCH_AND_ADD_2; break;
2460 case MVT::i32: LC = RTLIB::SYNC_FETCH_AND_ADD_4; break;
2461 case MVT::i64: LC = RTLIB::SYNC_FETCH_AND_ADD_8; break;
2464 case ISD::ATOMIC_LOAD_SUB:
2465 switch (VT.SimpleTy) {
2466 default: llvm_unreachable("Unexpected value type for atomic!");
2467 case MVT::i8: LC = RTLIB::SYNC_FETCH_AND_SUB_1; break;
2468 case MVT::i16: LC = RTLIB::SYNC_FETCH_AND_SUB_2; break;
2469 case MVT::i32: LC = RTLIB::SYNC_FETCH_AND_SUB_4; break;
2470 case MVT::i64: LC = RTLIB::SYNC_FETCH_AND_SUB_8; break;
2473 case ISD::ATOMIC_LOAD_AND:
2474 switch (VT.SimpleTy) {
2475 default: llvm_unreachable("Unexpected value type for atomic!");
2476 case MVT::i8: LC = RTLIB::SYNC_FETCH_AND_AND_1; break;
2477 case MVT::i16: LC = RTLIB::SYNC_FETCH_AND_AND_2; break;
2478 case MVT::i32: LC = RTLIB::SYNC_FETCH_AND_AND_4; break;
2479 case MVT::i64: LC = RTLIB::SYNC_FETCH_AND_AND_8; break;
2482 case ISD::ATOMIC_LOAD_OR:
2483 switch (VT.SimpleTy) {
2484 default: llvm_unreachable("Unexpected value type for atomic!");
2485 case MVT::i8: LC = RTLIB::SYNC_FETCH_AND_OR_1; break;
2486 case MVT::i16: LC = RTLIB::SYNC_FETCH_AND_OR_2; break;
2487 case MVT::i32: LC = RTLIB::SYNC_FETCH_AND_OR_4; break;
2488 case MVT::i64: LC = RTLIB::SYNC_FETCH_AND_OR_8; break;
2491 case ISD::ATOMIC_LOAD_XOR:
2492 switch (VT.SimpleTy) {
2493 default: llvm_unreachable("Unexpected value type for atomic!");
2494 case MVT::i8: LC = RTLIB::SYNC_FETCH_AND_XOR_1; break;
2495 case MVT::i16: LC = RTLIB::SYNC_FETCH_AND_XOR_2; break;
2496 case MVT::i32: LC = RTLIB::SYNC_FETCH_AND_XOR_4; break;
2497 case MVT::i64: LC = RTLIB::SYNC_FETCH_AND_XOR_8; break;
2500 case ISD::ATOMIC_LOAD_NAND:
2501 switch (VT.SimpleTy) {
2502 default: llvm_unreachable("Unexpected value type for atomic!");
2503 case MVT::i8: LC = RTLIB::SYNC_FETCH_AND_NAND_1; break;
2504 case MVT::i16: LC = RTLIB::SYNC_FETCH_AND_NAND_2; break;
2505 case MVT::i32: LC = RTLIB::SYNC_FETCH_AND_NAND_4; break;
2506 case MVT::i64: LC = RTLIB::SYNC_FETCH_AND_NAND_8; break;
2511 return ExpandChainLibCall(LC, Node, false);
2514 void SelectionDAGLegalize::ExpandNode(SDNode *Node) {
2515 SmallVector<SDValue, 8> Results;
2516 DebugLoc dl = Node->getDebugLoc();
2517 SDValue Tmp1, Tmp2, Tmp3, Tmp4;
2518 switch (Node->getOpcode()) {
2522 Tmp1 = ExpandBitCount(Node->getOpcode(), Node->getOperand(0), dl);
2523 Results.push_back(Tmp1);
2526 Results.push_back(ExpandBSWAP(Node->getOperand(0), dl));
2528 case ISD::FRAMEADDR:
2529 case ISD::RETURNADDR:
2530 case ISD::FRAME_TO_ARGS_OFFSET:
2531 Results.push_back(DAG.getConstant(0, Node->getValueType(0)));
2533 case ISD::FLT_ROUNDS_:
2534 Results.push_back(DAG.getConstant(1, Node->getValueType(0)));
2536 case ISD::EH_RETURN:
2540 case ISD::EH_SJLJ_LONGJMP:
2541 case ISD::EH_SJLJ_DISPATCHSETUP:
2542 // If the target didn't expand these, there's nothing to do, so just
2543 // preserve the chain and be done.
2544 Results.push_back(Node->getOperand(0));
2546 case ISD::EH_SJLJ_SETJMP:
2547 // If the target didn't expand this, just return 'zero' and preserve the
2549 Results.push_back(DAG.getConstant(0, MVT::i32));
2550 Results.push_back(Node->getOperand(0));
2552 case ISD::ATOMIC_FENCE:
2553 case ISD::MEMBARRIER: {
2554 // If the target didn't lower this, lower it to '__sync_synchronize()' call
2555 // FIXME: handle "fence singlethread" more efficiently.
2556 TargetLowering::ArgListTy Args;
2557 std::pair<SDValue, SDValue> CallResult =
2558 TLI.LowerCallTo(Node->getOperand(0), Type::getVoidTy(*DAG.getContext()),
2559 false, false, false, false, 0, CallingConv::C,
2560 /*isTailCall=*/false,
2561 /*isReturnValueUsed=*/true,
2562 DAG.getExternalSymbol("__sync_synchronize",
2563 TLI.getPointerTy()),
2565 Results.push_back(CallResult.second);
2568 case ISD::ATOMIC_LOAD: {
2569 // There is no libcall for atomic load; fake it with ATOMIC_CMP_SWAP.
2570 SDValue Zero = DAG.getConstant(0, Node->getValueType(0));
2571 SDValue Swap = DAG.getAtomic(ISD::ATOMIC_CMP_SWAP, dl,
2572 cast<AtomicSDNode>(Node)->getMemoryVT(),
2573 Node->getOperand(0),
2574 Node->getOperand(1), Zero, Zero,
2575 cast<AtomicSDNode>(Node)->getMemOperand(),
2576 cast<AtomicSDNode>(Node)->getOrdering(),
2577 cast<AtomicSDNode>(Node)->getSynchScope());
2578 Results.push_back(Swap.getValue(0));
2579 Results.push_back(Swap.getValue(1));
2582 case ISD::ATOMIC_STORE: {
2583 // There is no libcall for atomic store; fake it with ATOMIC_SWAP.
2584 SDValue Swap = DAG.getAtomic(ISD::ATOMIC_SWAP, dl,
2585 cast<AtomicSDNode>(Node)->getMemoryVT(),
2586 Node->getOperand(0),
2587 Node->getOperand(1), Node->getOperand(2),
2588 cast<AtomicSDNode>(Node)->getMemOperand(),
2589 cast<AtomicSDNode>(Node)->getOrdering(),
2590 cast<AtomicSDNode>(Node)->getSynchScope());
2591 Results.push_back(Swap.getValue(1));
2594 // By default, atomic intrinsics are marked Legal and lowered. Targets
2595 // which don't support them directly, however, may want libcalls, in which
2596 // case they mark them Expand, and we get here.
2597 case ISD::ATOMIC_SWAP:
2598 case ISD::ATOMIC_LOAD_ADD:
2599 case ISD::ATOMIC_LOAD_SUB:
2600 case ISD::ATOMIC_LOAD_AND:
2601 case ISD::ATOMIC_LOAD_OR:
2602 case ISD::ATOMIC_LOAD_XOR:
2603 case ISD::ATOMIC_LOAD_NAND:
2604 case ISD::ATOMIC_LOAD_MIN:
2605 case ISD::ATOMIC_LOAD_MAX:
2606 case ISD::ATOMIC_LOAD_UMIN:
2607 case ISD::ATOMIC_LOAD_UMAX:
2608 case ISD::ATOMIC_CMP_SWAP: {
2609 std::pair<SDValue, SDValue> Tmp = ExpandAtomic(Node);
2610 Results.push_back(Tmp.first);
2611 Results.push_back(Tmp.second);
2614 case ISD::DYNAMIC_STACKALLOC:
2615 ExpandDYNAMIC_STACKALLOC(Node, Results);
2617 case ISD::MERGE_VALUES:
2618 for (unsigned i = 0; i < Node->getNumValues(); i++)
2619 Results.push_back(Node->getOperand(i));
2622 EVT VT = Node->getValueType(0);
2624 Results.push_back(DAG.getConstant(0, VT));
2626 assert(VT.isFloatingPoint() && "Unknown value type!");
2627 Results.push_back(DAG.getConstantFP(0, VT));
2632 // If this operation is not supported, lower it to 'abort()' call
2633 TargetLowering::ArgListTy Args;
2634 std::pair<SDValue, SDValue> CallResult =
2635 TLI.LowerCallTo(Node->getOperand(0), Type::getVoidTy(*DAG.getContext()),
2636 false, false, false, false, 0, CallingConv::C,
2637 /*isTailCall=*/false,
2638 /*isReturnValueUsed=*/true,
2639 DAG.getExternalSymbol("abort", TLI.getPointerTy()),
2641 Results.push_back(CallResult.second);
2646 Tmp1 = EmitStackConvert(Node->getOperand(0), Node->getValueType(0),
2647 Node->getValueType(0), dl);
2648 Results.push_back(Tmp1);
2650 case ISD::FP_EXTEND:
2651 Tmp1 = EmitStackConvert(Node->getOperand(0),
2652 Node->getOperand(0).getValueType(),
2653 Node->getValueType(0), dl);
2654 Results.push_back(Tmp1);
2656 case ISD::SIGN_EXTEND_INREG: {
2657 // NOTE: we could fall back on load/store here too for targets without
2658 // SAR. However, it is doubtful that any exist.
2659 EVT ExtraVT = cast<VTSDNode>(Node->getOperand(1))->getVT();
2660 EVT VT = Node->getValueType(0);
2661 EVT ShiftAmountTy = TLI.getShiftAmountTy(VT);
2664 unsigned BitsDiff = VT.getScalarType().getSizeInBits() -
2665 ExtraVT.getScalarType().getSizeInBits();
2666 SDValue ShiftCst = DAG.getConstant(BitsDiff, ShiftAmountTy);
2667 Tmp1 = DAG.getNode(ISD::SHL, dl, Node->getValueType(0),
2668 Node->getOperand(0), ShiftCst);
2669 Tmp1 = DAG.getNode(ISD::SRA, dl, Node->getValueType(0), Tmp1, ShiftCst);
2670 Results.push_back(Tmp1);
2673 case ISD::FP_ROUND_INREG: {
2674 // The only way we can lower this is to turn it into a TRUNCSTORE,
2675 // EXTLOAD pair, targeting a temporary location (a stack slot).
2677 // NOTE: there is a choice here between constantly creating new stack
2678 // slots and always reusing the same one. We currently always create
2679 // new ones, as reuse may inhibit scheduling.
2680 EVT ExtraVT = cast<VTSDNode>(Node->getOperand(1))->getVT();
2681 Tmp1 = EmitStackConvert(Node->getOperand(0), ExtraVT,
2682 Node->getValueType(0), dl);
2683 Results.push_back(Tmp1);
2686 case ISD::SINT_TO_FP:
2687 case ISD::UINT_TO_FP:
2688 Tmp1 = ExpandLegalINT_TO_FP(Node->getOpcode() == ISD::SINT_TO_FP,
2689 Node->getOperand(0), Node->getValueType(0), dl);
2690 Results.push_back(Tmp1);
2692 case ISD::FP_TO_UINT: {
2693 SDValue True, False;
2694 EVT VT = Node->getOperand(0).getValueType();
2695 EVT NVT = Node->getValueType(0);
2696 APFloat apf(APInt::getNullValue(VT.getSizeInBits()));
2697 APInt x = APInt::getSignBit(NVT.getSizeInBits());
2698 (void)apf.convertFromAPInt(x, false, APFloat::rmNearestTiesToEven);
2699 Tmp1 = DAG.getConstantFP(apf, VT);
2700 Tmp2 = DAG.getSetCC(dl, TLI.getSetCCResultType(VT),
2701 Node->getOperand(0),
2703 True = DAG.getNode(ISD::FP_TO_SINT, dl, NVT, Node->getOperand(0));
2704 False = DAG.getNode(ISD::FP_TO_SINT, dl, NVT,
2705 DAG.getNode(ISD::FSUB, dl, VT,
2706 Node->getOperand(0), Tmp1));
2707 False = DAG.getNode(ISD::XOR, dl, NVT, False,
2708 DAG.getConstant(x, NVT));
2709 Tmp1 = DAG.getNode(ISD::SELECT, dl, NVT, Tmp2, True, False);
2710 Results.push_back(Tmp1);
2714 const Value *V = cast<SrcValueSDNode>(Node->getOperand(2))->getValue();
2715 EVT VT = Node->getValueType(0);
2716 Tmp1 = Node->getOperand(0);
2717 Tmp2 = Node->getOperand(1);
2718 unsigned Align = Node->getConstantOperandVal(3);
2720 SDValue VAListLoad = DAG.getLoad(TLI.getPointerTy(), dl, Tmp1, Tmp2,
2721 MachinePointerInfo(V),
2722 false, false, false, 0);
2723 SDValue VAList = VAListLoad;
2725 if (Align > TLI.getMinStackArgumentAlignment()) {
2726 assert(((Align & (Align-1)) == 0) && "Expected Align to be a power of 2");
2728 VAList = DAG.getNode(ISD::ADD, dl, TLI.getPointerTy(), VAList,
2729 DAG.getConstant(Align - 1,
2730 TLI.getPointerTy()));
2732 VAList = DAG.getNode(ISD::AND, dl, TLI.getPointerTy(), VAList,
2733 DAG.getConstant(-(int64_t)Align,
2734 TLI.getPointerTy()));
2737 // Increment the pointer, VAList, to the next vaarg
2738 Tmp3 = DAG.getNode(ISD::ADD, dl, TLI.getPointerTy(), VAList,
2739 DAG.getConstant(TLI.getTargetData()->
2740 getTypeAllocSize(VT.getTypeForEVT(*DAG.getContext())),
2741 TLI.getPointerTy()));
2742 // Store the incremented VAList to the legalized pointer
2743 Tmp3 = DAG.getStore(VAListLoad.getValue(1), dl, Tmp3, Tmp2,
2744 MachinePointerInfo(V), false, false, 0);
2745 // Load the actual argument out of the pointer VAList
2746 Results.push_back(DAG.getLoad(VT, dl, Tmp3, VAList, MachinePointerInfo(),
2747 false, false, false, 0));
2748 Results.push_back(Results[0].getValue(1));
2752 // This defaults to loading a pointer from the input and storing it to the
2753 // output, returning the chain.
2754 const Value *VD = cast<SrcValueSDNode>(Node->getOperand(3))->getValue();
2755 const Value *VS = cast<SrcValueSDNode>(Node->getOperand(4))->getValue();
2756 Tmp1 = DAG.getLoad(TLI.getPointerTy(), dl, Node->getOperand(0),
2757 Node->getOperand(2), MachinePointerInfo(VS),
2758 false, false, false, 0);
2759 Tmp1 = DAG.getStore(Tmp1.getValue(1), dl, Tmp1, Node->getOperand(1),
2760 MachinePointerInfo(VD), false, false, 0);
2761 Results.push_back(Tmp1);
2764 case ISD::EXTRACT_VECTOR_ELT:
2765 if (Node->getOperand(0).getValueType().getVectorNumElements() == 1)
2766 // This must be an access of the only element. Return it.
2767 Tmp1 = DAG.getNode(ISD::BITCAST, dl, Node->getValueType(0),
2768 Node->getOperand(0));
2770 Tmp1 = ExpandExtractFromVectorThroughStack(SDValue(Node, 0));
2771 Results.push_back(Tmp1);
2773 case ISD::EXTRACT_SUBVECTOR:
2774 Results.push_back(ExpandExtractFromVectorThroughStack(SDValue(Node, 0)));
2776 case ISD::INSERT_SUBVECTOR:
2777 Results.push_back(ExpandInsertToVectorThroughStack(SDValue(Node, 0)));
2779 case ISD::CONCAT_VECTORS: {
2780 Results.push_back(ExpandVectorBuildThroughStack(Node));
2783 case ISD::SCALAR_TO_VECTOR:
2784 Results.push_back(ExpandSCALAR_TO_VECTOR(Node));
2786 case ISD::INSERT_VECTOR_ELT:
2787 Results.push_back(ExpandINSERT_VECTOR_ELT(Node->getOperand(0),
2788 Node->getOperand(1),
2789 Node->getOperand(2), dl));
2791 case ISD::VECTOR_SHUFFLE: {
2792 SmallVector<int, 8> Mask;
2793 cast<ShuffleVectorSDNode>(Node)->getMask(Mask);
2795 EVT VT = Node->getValueType(0);
2796 EVT EltVT = VT.getVectorElementType();
2797 if (!TLI.isTypeLegal(EltVT))
2798 EltVT = TLI.getTypeToTransformTo(*DAG.getContext(), EltVT);
2799 unsigned NumElems = VT.getVectorNumElements();
2800 SmallVector<SDValue, 8> Ops;
2801 for (unsigned i = 0; i != NumElems; ++i) {
2803 Ops.push_back(DAG.getUNDEF(EltVT));
2806 unsigned Idx = Mask[i];
2808 Ops.push_back(DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, EltVT,
2809 Node->getOperand(0),
2810 DAG.getIntPtrConstant(Idx)));
2812 Ops.push_back(DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, EltVT,
2813 Node->getOperand(1),
2814 DAG.getIntPtrConstant(Idx - NumElems)));
2816 Tmp1 = DAG.getNode(ISD::BUILD_VECTOR, dl, VT, &Ops[0], Ops.size());
2817 Results.push_back(Tmp1);
2820 case ISD::EXTRACT_ELEMENT: {
2821 EVT OpTy = Node->getOperand(0).getValueType();
2822 if (cast<ConstantSDNode>(Node->getOperand(1))->getZExtValue()) {
2824 Tmp1 = DAG.getNode(ISD::SRL, dl, OpTy, Node->getOperand(0),
2825 DAG.getConstant(OpTy.getSizeInBits()/2,
2826 TLI.getShiftAmountTy(Node->getOperand(0).getValueType())));
2827 Tmp1 = DAG.getNode(ISD::TRUNCATE, dl, Node->getValueType(0), Tmp1);
2830 Tmp1 = DAG.getNode(ISD::TRUNCATE, dl, Node->getValueType(0),
2831 Node->getOperand(0));
2833 Results.push_back(Tmp1);
2836 case ISD::STACKSAVE:
2837 // Expand to CopyFromReg if the target set
2838 // StackPointerRegisterToSaveRestore.
2839 if (unsigned SP = TLI.getStackPointerRegisterToSaveRestore()) {
2840 Results.push_back(DAG.getCopyFromReg(Node->getOperand(0), dl, SP,
2841 Node->getValueType(0)));
2842 Results.push_back(Results[0].getValue(1));
2844 Results.push_back(DAG.getUNDEF(Node->getValueType(0)));
2845 Results.push_back(Node->getOperand(0));
2848 case ISD::STACKRESTORE:
2849 // Expand to CopyToReg if the target set
2850 // StackPointerRegisterToSaveRestore.
2851 if (unsigned SP = TLI.getStackPointerRegisterToSaveRestore()) {
2852 Results.push_back(DAG.getCopyToReg(Node->getOperand(0), dl, SP,
2853 Node->getOperand(1)));
2855 Results.push_back(Node->getOperand(0));
2858 case ISD::FCOPYSIGN:
2859 Results.push_back(ExpandFCOPYSIGN(Node));
2862 // Expand Y = FNEG(X) -> Y = SUB -0.0, X
2863 Tmp1 = DAG.getConstantFP(-0.0, Node->getValueType(0));
2864 Tmp1 = DAG.getNode(ISD::FSUB, dl, Node->getValueType(0), Tmp1,
2865 Node->getOperand(0));
2866 Results.push_back(Tmp1);
2869 // Expand Y = FABS(X) -> Y = (X >u 0.0) ? X : fneg(X).
2870 EVT VT = Node->getValueType(0);
2871 Tmp1 = Node->getOperand(0);
2872 Tmp2 = DAG.getConstantFP(0.0, VT);
2873 Tmp2 = DAG.getSetCC(dl, TLI.getSetCCResultType(Tmp1.getValueType()),
2874 Tmp1, Tmp2, ISD::SETUGT);
2875 Tmp3 = DAG.getNode(ISD::FNEG, dl, VT, Tmp1);
2876 Tmp1 = DAG.getNode(ISD::SELECT, dl, VT, Tmp2, Tmp1, Tmp3);
2877 Results.push_back(Tmp1);
2881 Results.push_back(ExpandFPLibCall(Node, RTLIB::SQRT_F32, RTLIB::SQRT_F64,
2882 RTLIB::SQRT_F80, RTLIB::SQRT_PPCF128));
2885 Results.push_back(ExpandFPLibCall(Node, RTLIB::SIN_F32, RTLIB::SIN_F64,
2886 RTLIB::SIN_F80, RTLIB::SIN_PPCF128));
2889 Results.push_back(ExpandFPLibCall(Node, RTLIB::COS_F32, RTLIB::COS_F64,
2890 RTLIB::COS_F80, RTLIB::COS_PPCF128));
2893 Results.push_back(ExpandFPLibCall(Node, RTLIB::LOG_F32, RTLIB::LOG_F64,
2894 RTLIB::LOG_F80, RTLIB::LOG_PPCF128));
2897 Results.push_back(ExpandFPLibCall(Node, RTLIB::LOG2_F32, RTLIB::LOG2_F64,
2898 RTLIB::LOG2_F80, RTLIB::LOG2_PPCF128));
2901 Results.push_back(ExpandFPLibCall(Node, RTLIB::LOG10_F32, RTLIB::LOG10_F64,
2902 RTLIB::LOG10_F80, RTLIB::LOG10_PPCF128));
2905 Results.push_back(ExpandFPLibCall(Node, RTLIB::EXP_F32, RTLIB::EXP_F64,
2906 RTLIB::EXP_F80, RTLIB::EXP_PPCF128));
2909 Results.push_back(ExpandFPLibCall(Node, RTLIB::EXP2_F32, RTLIB::EXP2_F64,
2910 RTLIB::EXP2_F80, RTLIB::EXP2_PPCF128));
2913 Results.push_back(ExpandFPLibCall(Node, RTLIB::TRUNC_F32, RTLIB::TRUNC_F64,
2914 RTLIB::TRUNC_F80, RTLIB::TRUNC_PPCF128));
2917 Results.push_back(ExpandFPLibCall(Node, RTLIB::FLOOR_F32, RTLIB::FLOOR_F64,
2918 RTLIB::FLOOR_F80, RTLIB::FLOOR_PPCF128));
2921 Results.push_back(ExpandFPLibCall(Node, RTLIB::CEIL_F32, RTLIB::CEIL_F64,
2922 RTLIB::CEIL_F80, RTLIB::CEIL_PPCF128));
2925 Results.push_back(ExpandFPLibCall(Node, RTLIB::RINT_F32, RTLIB::RINT_F64,
2926 RTLIB::RINT_F80, RTLIB::RINT_PPCF128));
2928 case ISD::FNEARBYINT:
2929 Results.push_back(ExpandFPLibCall(Node, RTLIB::NEARBYINT_F32,
2930 RTLIB::NEARBYINT_F64,
2931 RTLIB::NEARBYINT_F80,
2932 RTLIB::NEARBYINT_PPCF128));
2935 Results.push_back(ExpandFPLibCall(Node, RTLIB::POWI_F32, RTLIB::POWI_F64,
2936 RTLIB::POWI_F80, RTLIB::POWI_PPCF128));
2939 Results.push_back(ExpandFPLibCall(Node, RTLIB::POW_F32, RTLIB::POW_F64,
2940 RTLIB::POW_F80, RTLIB::POW_PPCF128));
2943 Results.push_back(ExpandFPLibCall(Node, RTLIB::DIV_F32, RTLIB::DIV_F64,
2944 RTLIB::DIV_F80, RTLIB::DIV_PPCF128));
2947 Results.push_back(ExpandFPLibCall(Node, RTLIB::REM_F32, RTLIB::REM_F64,
2948 RTLIB::REM_F80, RTLIB::REM_PPCF128));
2951 Results.push_back(ExpandFPLibCall(Node, RTLIB::FMA_F32, RTLIB::FMA_F64,
2952 RTLIB::FMA_F80, RTLIB::FMA_PPCF128));
2954 case ISD::FP16_TO_FP32:
2955 Results.push_back(ExpandLibCall(RTLIB::FPEXT_F16_F32, Node, false));
2957 case ISD::FP32_TO_FP16:
2958 Results.push_back(ExpandLibCall(RTLIB::FPROUND_F32_F16, Node, false));
2960 case ISD::ConstantFP: {
2961 ConstantFPSDNode *CFP = cast<ConstantFPSDNode>(Node);
2962 // Check to see if this FP immediate is already legal.
2963 // If this is a legal constant, turn it into a TargetConstantFP node.
2964 if (!TLI.isFPImmLegal(CFP->getValueAPF(), Node->getValueType(0)))
2965 Results.push_back(ExpandConstantFP(CFP, true));
2968 case ISD::EHSELECTION: {
2969 unsigned Reg = TLI.getExceptionSelectorRegister();
2970 assert(Reg && "Can't expand to unknown register!");
2971 Results.push_back(DAG.getCopyFromReg(Node->getOperand(1), dl, Reg,
2972 Node->getValueType(0)));
2973 Results.push_back(Results[0].getValue(1));
2976 case ISD::EXCEPTIONADDR: {
2977 unsigned Reg = TLI.getExceptionAddressRegister();
2978 assert(Reg && "Can't expand to unknown register!");
2979 Results.push_back(DAG.getCopyFromReg(Node->getOperand(0), dl, Reg,
2980 Node->getValueType(0)));
2981 Results.push_back(Results[0].getValue(1));
2985 EVT VT = Node->getValueType(0);
2986 assert(TLI.isOperationLegalOrCustom(ISD::ADD, VT) &&
2987 TLI.isOperationLegalOrCustom(ISD::XOR, VT) &&
2988 "Don't know how to expand this subtraction!");
2989 Tmp1 = DAG.getNode(ISD::XOR, dl, VT, Node->getOperand(1),
2990 DAG.getConstant(APInt::getAllOnesValue(VT.getSizeInBits()), VT));
2991 Tmp1 = DAG.getNode(ISD::ADD, dl, VT, Tmp2, DAG.getConstant(1, VT));
2992 Results.push_back(DAG.getNode(ISD::ADD, dl, VT, Node->getOperand(0), Tmp1));
2997 EVT VT = Node->getValueType(0);
2998 SDVTList VTs = DAG.getVTList(VT, VT);
2999 bool isSigned = Node->getOpcode() == ISD::SREM;
3000 unsigned DivOpc = isSigned ? ISD::SDIV : ISD::UDIV;
3001 unsigned DivRemOpc = isSigned ? ISD::SDIVREM : ISD::UDIVREM;
3002 Tmp2 = Node->getOperand(0);
3003 Tmp3 = Node->getOperand(1);
3004 if (TLI.isOperationLegalOrCustom(DivRemOpc, VT) ||
3005 (isDivRemLibcallAvailable(Node, isSigned, TLI) &&
3006 UseDivRem(Node, isSigned, false))) {
3007 Tmp1 = DAG.getNode(DivRemOpc, dl, VTs, Tmp2, Tmp3).getValue(1);
3008 } else if (TLI.isOperationLegalOrCustom(DivOpc, VT)) {
3010 Tmp1 = DAG.getNode(DivOpc, dl, VT, Tmp2, Tmp3);
3011 Tmp1 = DAG.getNode(ISD::MUL, dl, VT, Tmp1, Tmp3);
3012 Tmp1 = DAG.getNode(ISD::SUB, dl, VT, Tmp2, Tmp1);
3013 } else if (isSigned)
3014 Tmp1 = ExpandIntLibCall(Node, true,
3016 RTLIB::SREM_I16, RTLIB::SREM_I32,
3017 RTLIB::SREM_I64, RTLIB::SREM_I128);
3019 Tmp1 = ExpandIntLibCall(Node, false,
3021 RTLIB::UREM_I16, RTLIB::UREM_I32,
3022 RTLIB::UREM_I64, RTLIB::UREM_I128);
3023 Results.push_back(Tmp1);
3028 bool isSigned = Node->getOpcode() == ISD::SDIV;
3029 unsigned DivRemOpc = isSigned ? ISD::SDIVREM : ISD::UDIVREM;
3030 EVT VT = Node->getValueType(0);
3031 SDVTList VTs = DAG.getVTList(VT, VT);
3032 if (TLI.isOperationLegalOrCustom(DivRemOpc, VT) ||
3033 (isDivRemLibcallAvailable(Node, isSigned, TLI) &&
3034 UseDivRem(Node, isSigned, true)))
3035 Tmp1 = DAG.getNode(DivRemOpc, dl, VTs, Node->getOperand(0),
3036 Node->getOperand(1));
3038 Tmp1 = ExpandIntLibCall(Node, true,
3040 RTLIB::SDIV_I16, RTLIB::SDIV_I32,
3041 RTLIB::SDIV_I64, RTLIB::SDIV_I128);
3043 Tmp1 = ExpandIntLibCall(Node, false,
3045 RTLIB::UDIV_I16, RTLIB::UDIV_I32,
3046 RTLIB::UDIV_I64, RTLIB::UDIV_I128);
3047 Results.push_back(Tmp1);
3052 unsigned ExpandOpcode = Node->getOpcode() == ISD::MULHU ? ISD::UMUL_LOHI :
3054 EVT VT = Node->getValueType(0);
3055 SDVTList VTs = DAG.getVTList(VT, VT);
3056 assert(TLI.isOperationLegalOrCustom(ExpandOpcode, VT) &&
3057 "If this wasn't legal, it shouldn't have been created!");
3058 Tmp1 = DAG.getNode(ExpandOpcode, dl, VTs, Node->getOperand(0),
3059 Node->getOperand(1));
3060 Results.push_back(Tmp1.getValue(1));
3065 // Expand into divrem libcall
3066 ExpandDivRemLibCall(Node, Results);
3069 EVT VT = Node->getValueType(0);
3070 SDVTList VTs = DAG.getVTList(VT, VT);
3071 // See if multiply or divide can be lowered using two-result operations.
3072 // We just need the low half of the multiply; try both the signed
3073 // and unsigned forms. If the target supports both SMUL_LOHI and
3074 // UMUL_LOHI, form a preference by checking which forms of plain
3075 // MULH it supports.
3076 bool HasSMUL_LOHI = TLI.isOperationLegalOrCustom(ISD::SMUL_LOHI, VT);
3077 bool HasUMUL_LOHI = TLI.isOperationLegalOrCustom(ISD::UMUL_LOHI, VT);
3078 bool HasMULHS = TLI.isOperationLegalOrCustom(ISD::MULHS, VT);
3079 bool HasMULHU = TLI.isOperationLegalOrCustom(ISD::MULHU, VT);
3080 unsigned OpToUse = 0;
3081 if (HasSMUL_LOHI && !HasMULHS) {
3082 OpToUse = ISD::SMUL_LOHI;
3083 } else if (HasUMUL_LOHI && !HasMULHU) {
3084 OpToUse = ISD::UMUL_LOHI;
3085 } else if (HasSMUL_LOHI) {
3086 OpToUse = ISD::SMUL_LOHI;
3087 } else if (HasUMUL_LOHI) {
3088 OpToUse = ISD::UMUL_LOHI;
3091 Results.push_back(DAG.getNode(OpToUse, dl, VTs, Node->getOperand(0),
3092 Node->getOperand(1)));
3095 Tmp1 = ExpandIntLibCall(Node, false,
3097 RTLIB::MUL_I16, RTLIB::MUL_I32,
3098 RTLIB::MUL_I64, RTLIB::MUL_I128);
3099 Results.push_back(Tmp1);
3104 SDValue LHS = Node->getOperand(0);
3105 SDValue RHS = Node->getOperand(1);
3106 SDValue Sum = DAG.getNode(Node->getOpcode() == ISD::SADDO ?
3107 ISD::ADD : ISD::SUB, dl, LHS.getValueType(),
3109 Results.push_back(Sum);
3110 EVT OType = Node->getValueType(1);
3112 SDValue Zero = DAG.getConstant(0, LHS.getValueType());
3114 // LHSSign -> LHS >= 0
3115 // RHSSign -> RHS >= 0
3116 // SumSign -> Sum >= 0
3119 // Overflow -> (LHSSign == RHSSign) && (LHSSign != SumSign)
3121 // Overflow -> (LHSSign != RHSSign) && (LHSSign != SumSign)
3123 SDValue LHSSign = DAG.getSetCC(dl, OType, LHS, Zero, ISD::SETGE);
3124 SDValue RHSSign = DAG.getSetCC(dl, OType, RHS, Zero, ISD::SETGE);
3125 SDValue SignsMatch = DAG.getSetCC(dl, OType, LHSSign, RHSSign,
3126 Node->getOpcode() == ISD::SADDO ?
3127 ISD::SETEQ : ISD::SETNE);
3129 SDValue SumSign = DAG.getSetCC(dl, OType, Sum, Zero, ISD::SETGE);
3130 SDValue SumSignNE = DAG.getSetCC(dl, OType, LHSSign, SumSign, ISD::SETNE);
3132 SDValue Cmp = DAG.getNode(ISD::AND, dl, OType, SignsMatch, SumSignNE);
3133 Results.push_back(Cmp);
3138 SDValue LHS = Node->getOperand(0);
3139 SDValue RHS = Node->getOperand(1);
3140 SDValue Sum = DAG.getNode(Node->getOpcode() == ISD::UADDO ?
3141 ISD::ADD : ISD::SUB, dl, LHS.getValueType(),
3143 Results.push_back(Sum);
3144 Results.push_back(DAG.getSetCC(dl, Node->getValueType(1), Sum, LHS,
3145 Node->getOpcode () == ISD::UADDO ?
3146 ISD::SETULT : ISD::SETUGT));
3151 EVT VT = Node->getValueType(0);
3152 EVT WideVT = EVT::getIntegerVT(*DAG.getContext(), VT.getSizeInBits() * 2);
3153 SDValue LHS = Node->getOperand(0);
3154 SDValue RHS = Node->getOperand(1);
3157 static const unsigned Ops[2][3] =
3158 { { ISD::MULHU, ISD::UMUL_LOHI, ISD::ZERO_EXTEND },
3159 { ISD::MULHS, ISD::SMUL_LOHI, ISD::SIGN_EXTEND }};
3160 bool isSigned = Node->getOpcode() == ISD::SMULO;
3161 if (TLI.isOperationLegalOrCustom(Ops[isSigned][0], VT)) {
3162 BottomHalf = DAG.getNode(ISD::MUL, dl, VT, LHS, RHS);
3163 TopHalf = DAG.getNode(Ops[isSigned][0], dl, VT, LHS, RHS);
3164 } else if (TLI.isOperationLegalOrCustom(Ops[isSigned][1], VT)) {
3165 BottomHalf = DAG.getNode(Ops[isSigned][1], dl, DAG.getVTList(VT, VT), LHS,
3167 TopHalf = BottomHalf.getValue(1);
3168 } else if (TLI.isTypeLegal(EVT::getIntegerVT(*DAG.getContext(),
3169 VT.getSizeInBits() * 2))) {
3170 LHS = DAG.getNode(Ops[isSigned][2], dl, WideVT, LHS);
3171 RHS = DAG.getNode(Ops[isSigned][2], dl, WideVT, RHS);
3172 Tmp1 = DAG.getNode(ISD::MUL, dl, WideVT, LHS, RHS);
3173 BottomHalf = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, VT, Tmp1,
3174 DAG.getIntPtrConstant(0));
3175 TopHalf = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, VT, Tmp1,
3176 DAG.getIntPtrConstant(1));
3178 // We can fall back to a libcall with an illegal type for the MUL if we
3179 // have a libcall big enough.
3180 // Also, we can fall back to a division in some cases, but that's a big
3181 // performance hit in the general case.
3182 RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
3183 if (WideVT == MVT::i16)
3184 LC = RTLIB::MUL_I16;
3185 else if (WideVT == MVT::i32)
3186 LC = RTLIB::MUL_I32;
3187 else if (WideVT == MVT::i64)
3188 LC = RTLIB::MUL_I64;
3189 else if (WideVT == MVT::i128)
3190 LC = RTLIB::MUL_I128;
3191 assert(LC != RTLIB::UNKNOWN_LIBCALL && "Cannot expand this operation!");
3193 // The high part is obtained by SRA'ing all but one of the bits of low
3195 unsigned LoSize = VT.getSizeInBits();
3196 SDValue HiLHS = DAG.getNode(ISD::SRA, dl, VT, RHS,
3197 DAG.getConstant(LoSize-1, TLI.getPointerTy()));
3198 SDValue HiRHS = DAG.getNode(ISD::SRA, dl, VT, LHS,
3199 DAG.getConstant(LoSize-1, TLI.getPointerTy()));
3201 // Here we're passing the 2 arguments explicitly as 4 arguments that are
3202 // pre-lowered to the correct types. This all depends upon WideVT not
3203 // being a legal type for the architecture and thus has to be split to
3205 SDValue Args[] = { LHS, HiLHS, RHS, HiRHS };
3206 SDValue Ret = ExpandLibCall(LC, WideVT, Args, 4, isSigned, dl);
3207 BottomHalf = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, VT, Ret,
3208 DAG.getIntPtrConstant(0));
3209 TopHalf = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, VT, Ret,
3210 DAG.getIntPtrConstant(1));
3211 // Ret is a node with an illegal type. Because such things are not
3212 // generally permitted during this phase of legalization, delete the
3213 // node. The above EXTRACT_ELEMENT nodes should have been folded.
3214 DAG.DeleteNode(Ret.getNode());
3218 Tmp1 = DAG.getConstant(VT.getSizeInBits() - 1,
3219 TLI.getShiftAmountTy(BottomHalf.getValueType()));
3220 Tmp1 = DAG.getNode(ISD::SRA, dl, VT, BottomHalf, Tmp1);
3221 TopHalf = DAG.getSetCC(dl, TLI.getSetCCResultType(VT), TopHalf, Tmp1,
3224 TopHalf = DAG.getSetCC(dl, TLI.getSetCCResultType(VT), TopHalf,
3225 DAG.getConstant(0, VT), ISD::SETNE);
3227 Results.push_back(BottomHalf);
3228 Results.push_back(TopHalf);
3231 case ISD::BUILD_PAIR: {
3232 EVT PairTy = Node->getValueType(0);
3233 Tmp1 = DAG.getNode(ISD::ZERO_EXTEND, dl, PairTy, Node->getOperand(0));
3234 Tmp2 = DAG.getNode(ISD::ANY_EXTEND, dl, PairTy, Node->getOperand(1));
3235 Tmp2 = DAG.getNode(ISD::SHL, dl, PairTy, Tmp2,
3236 DAG.getConstant(PairTy.getSizeInBits()/2,
3237 TLI.getShiftAmountTy(PairTy)));
3238 Results.push_back(DAG.getNode(ISD::OR, dl, PairTy, Tmp1, Tmp2));
3242 Tmp1 = Node->getOperand(0);
3243 Tmp2 = Node->getOperand(1);
3244 Tmp3 = Node->getOperand(2);
3245 if (Tmp1.getOpcode() == ISD::SETCC) {
3246 Tmp1 = DAG.getSelectCC(dl, Tmp1.getOperand(0), Tmp1.getOperand(1),
3248 cast<CondCodeSDNode>(Tmp1.getOperand(2))->get());
3250 Tmp1 = DAG.getSelectCC(dl, Tmp1,
3251 DAG.getConstant(0, Tmp1.getValueType()),
3252 Tmp2, Tmp3, ISD::SETNE);
3254 Results.push_back(Tmp1);
3257 SDValue Chain = Node->getOperand(0);
3258 SDValue Table = Node->getOperand(1);
3259 SDValue Index = Node->getOperand(2);
3261 EVT PTy = TLI.getPointerTy();
3263 const TargetData &TD = *TLI.getTargetData();
3264 unsigned EntrySize =
3265 DAG.getMachineFunction().getJumpTableInfo()->getEntrySize(TD);
3267 Index = DAG.getNode(ISD::MUL, dl, PTy,
3268 Index, DAG.getConstant(EntrySize, PTy));
3269 SDValue Addr = DAG.getNode(ISD::ADD, dl, PTy, Index, Table);
3271 EVT MemVT = EVT::getIntegerVT(*DAG.getContext(), EntrySize * 8);
3272 SDValue LD = DAG.getExtLoad(ISD::SEXTLOAD, dl, PTy, Chain, Addr,
3273 MachinePointerInfo::getJumpTable(), MemVT,
3276 if (TM.getRelocationModel() == Reloc::PIC_) {
3277 // For PIC, the sequence is:
3278 // BRIND(load(Jumptable + index) + RelocBase)
3279 // RelocBase can be JumpTable, GOT or some sort of global base.
3280 Addr = DAG.getNode(ISD::ADD, dl, PTy, Addr,
3281 TLI.getPICJumpTableRelocBase(Table, DAG));
3283 Tmp1 = DAG.getNode(ISD::BRIND, dl, MVT::Other, LD.getValue(1), Addr);
3284 Results.push_back(Tmp1);
3288 // Expand brcond's setcc into its constituent parts and create a BR_CC
3290 Tmp1 = Node->getOperand(0);
3291 Tmp2 = Node->getOperand(1);
3292 if (Tmp2.getOpcode() == ISD::SETCC) {
3293 Tmp1 = DAG.getNode(ISD::BR_CC, dl, MVT::Other,
3294 Tmp1, Tmp2.getOperand(2),
3295 Tmp2.getOperand(0), Tmp2.getOperand(1),
3296 Node->getOperand(2));
3298 // We test only the i1 bit. Skip the AND if UNDEF.
3299 Tmp3 = (Tmp2.getOpcode() == ISD::UNDEF) ? Tmp2 :
3300 DAG.getNode(ISD::AND, dl, Tmp2.getValueType(), Tmp2,
3301 DAG.getConstant(1, Tmp2.getValueType()));
3302 Tmp1 = DAG.getNode(ISD::BR_CC, dl, MVT::Other, Tmp1,
3303 DAG.getCondCode(ISD::SETNE), Tmp3,
3304 DAG.getConstant(0, Tmp3.getValueType()),
3305 Node->getOperand(2));
3307 Results.push_back(Tmp1);
3310 Tmp1 = Node->getOperand(0);
3311 Tmp2 = Node->getOperand(1);
3312 Tmp3 = Node->getOperand(2);
3313 LegalizeSetCCCondCode(Node->getValueType(0), Tmp1, Tmp2, Tmp3, dl);
3315 // If we expanded the SETCC into an AND/OR, return the new node
3316 if (Tmp2.getNode() == 0) {
3317 Results.push_back(Tmp1);
3321 // Otherwise, SETCC for the given comparison type must be completely
3322 // illegal; expand it into a SELECT_CC.
3323 EVT VT = Node->getValueType(0);
3324 Tmp1 = DAG.getNode(ISD::SELECT_CC, dl, VT, Tmp1, Tmp2,
3325 DAG.getConstant(1, VT), DAG.getConstant(0, VT), Tmp3);
3326 Results.push_back(Tmp1);
3329 case ISD::SELECT_CC: {
3330 Tmp1 = Node->getOperand(0); // LHS
3331 Tmp2 = Node->getOperand(1); // RHS
3332 Tmp3 = Node->getOperand(2); // True
3333 Tmp4 = Node->getOperand(3); // False
3334 SDValue CC = Node->getOperand(4);
3336 LegalizeSetCCCondCode(TLI.getSetCCResultType(Tmp1.getValueType()),
3337 Tmp1, Tmp2, CC, dl);
3339 assert(!Tmp2.getNode() && "Can't legalize SELECT_CC with legal condition!");
3340 Tmp2 = DAG.getConstant(0, Tmp1.getValueType());
3341 CC = DAG.getCondCode(ISD::SETNE);
3342 Tmp1 = DAG.getNode(ISD::SELECT_CC, dl, Node->getValueType(0), Tmp1, Tmp2,
3344 Results.push_back(Tmp1);
3348 Tmp1 = Node->getOperand(0); // Chain
3349 Tmp2 = Node->getOperand(2); // LHS
3350 Tmp3 = Node->getOperand(3); // RHS
3351 Tmp4 = Node->getOperand(1); // CC
3353 LegalizeSetCCCondCode(TLI.getSetCCResultType(Tmp2.getValueType()),
3354 Tmp2, Tmp3, Tmp4, dl);
3356 assert(!Tmp3.getNode() && "Can't legalize BR_CC with legal condition!");
3357 Tmp3 = DAG.getConstant(0, Tmp2.getValueType());
3358 Tmp4 = DAG.getCondCode(ISD::SETNE);
3359 Tmp1 = DAG.getNode(ISD::BR_CC, dl, Node->getValueType(0), Tmp1, Tmp4, Tmp2,
3360 Tmp3, Node->getOperand(4));
3361 Results.push_back(Tmp1);
3364 case ISD::BUILD_VECTOR:
3365 Results.push_back(ExpandBUILD_VECTOR(Node));
3370 // Scalarize vector SRA/SRL/SHL.
3371 EVT VT = Node->getValueType(0);
3372 assert(VT.isVector() && "Unable to legalize non-vector shift");
3373 assert(TLI.isTypeLegal(VT.getScalarType())&& "Element type must be legal");
3374 unsigned NumElem = VT.getVectorNumElements();
3376 SmallVector<SDValue, 8> Scalars;
3377 for (unsigned Idx = 0; Idx < NumElem; Idx++) {
3378 SDValue Ex = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl,
3380 Node->getOperand(0), DAG.getIntPtrConstant(Idx));
3381 SDValue Sh = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl,
3383 Node->getOperand(1), DAG.getIntPtrConstant(Idx));
3384 Scalars.push_back(DAG.getNode(Node->getOpcode(), dl,
3385 VT.getScalarType(), Ex, Sh));
3388 DAG.getNode(ISD::BUILD_VECTOR, dl, Node->getValueType(0),
3389 &Scalars[0], Scalars.size());
3390 ReplaceNode(SDValue(Node, 0), Result);
3393 case ISD::GLOBAL_OFFSET_TABLE:
3394 case ISD::GlobalAddress:
3395 case ISD::GlobalTLSAddress:
3396 case ISD::ExternalSymbol:
3397 case ISD::ConstantPool:
3398 case ISD::JumpTable:
3399 case ISD::INTRINSIC_W_CHAIN:
3400 case ISD::INTRINSIC_WO_CHAIN:
3401 case ISD::INTRINSIC_VOID:
3402 // FIXME: Custom lowering for these operations shouldn't return null!
3406 // Replace the original node with the legalized result.
3407 if (!Results.empty())
3408 ReplaceNode(Node, Results.data());
3411 void SelectionDAGLegalize::PromoteNode(SDNode *Node) {
3412 SmallVector<SDValue, 8> Results;
3413 EVT OVT = Node->getValueType(0);
3414 if (Node->getOpcode() == ISD::UINT_TO_FP ||
3415 Node->getOpcode() == ISD::SINT_TO_FP ||
3416 Node->getOpcode() == ISD::SETCC) {
3417 OVT = Node->getOperand(0).getValueType();
3419 EVT NVT = TLI.getTypeToPromoteTo(Node->getOpcode(), OVT);
3420 DebugLoc dl = Node->getDebugLoc();
3421 SDValue Tmp1, Tmp2, Tmp3;
3422 switch (Node->getOpcode()) {
3426 // Zero extend the argument.
3427 Tmp1 = DAG.getNode(ISD::ZERO_EXTEND, dl, NVT, Node->getOperand(0));
3428 // Perform the larger operation.
3429 Tmp1 = DAG.getNode(Node->getOpcode(), dl, NVT, Tmp1);
3430 if (Node->getOpcode() == ISD::CTTZ) {
3431 //if Tmp1 == sizeinbits(NVT) then Tmp1 = sizeinbits(Old VT)
3432 Tmp2 = DAG.getSetCC(dl, TLI.getSetCCResultType(NVT),
3433 Tmp1, DAG.getConstant(NVT.getSizeInBits(), NVT),
3435 Tmp1 = DAG.getNode(ISD::SELECT, dl, NVT, Tmp2,
3436 DAG.getConstant(OVT.getSizeInBits(), NVT), Tmp1);
3437 } else if (Node->getOpcode() == ISD::CTLZ) {
3438 // Tmp1 = Tmp1 - (sizeinbits(NVT) - sizeinbits(Old VT))
3439 Tmp1 = DAG.getNode(ISD::SUB, dl, NVT, Tmp1,
3440 DAG.getConstant(NVT.getSizeInBits() -
3441 OVT.getSizeInBits(), NVT));
3443 Results.push_back(DAG.getNode(ISD::TRUNCATE, dl, OVT, Tmp1));
3446 unsigned DiffBits = NVT.getSizeInBits() - OVT.getSizeInBits();
3447 Tmp1 = DAG.getNode(ISD::ZERO_EXTEND, dl, NVT, Node->getOperand(0));
3448 Tmp1 = DAG.getNode(ISD::BSWAP, dl, NVT, Tmp1);
3449 Tmp1 = DAG.getNode(ISD::SRL, dl, NVT, Tmp1,
3450 DAG.getConstant(DiffBits, TLI.getShiftAmountTy(NVT)));
3451 Results.push_back(Tmp1);
3454 case ISD::FP_TO_UINT:
3455 case ISD::FP_TO_SINT:
3456 Tmp1 = PromoteLegalFP_TO_INT(Node->getOperand(0), Node->getValueType(0),
3457 Node->getOpcode() == ISD::FP_TO_SINT, dl);
3458 Results.push_back(Tmp1);
3460 case ISD::UINT_TO_FP:
3461 case ISD::SINT_TO_FP:
3462 Tmp1 = PromoteLegalINT_TO_FP(Node->getOperand(0), Node->getValueType(0),
3463 Node->getOpcode() == ISD::SINT_TO_FP, dl);
3464 Results.push_back(Tmp1);
3469 unsigned ExtOp, TruncOp;
3470 if (OVT.isVector()) {
3471 ExtOp = ISD::BITCAST;
3472 TruncOp = ISD::BITCAST;
3474 assert(OVT.isInteger() && "Cannot promote logic operation");
3475 ExtOp = ISD::ANY_EXTEND;
3476 TruncOp = ISD::TRUNCATE;
3478 // Promote each of the values to the new type.
3479 Tmp1 = DAG.getNode(ExtOp, dl, NVT, Node->getOperand(0));
3480 Tmp2 = DAG.getNode(ExtOp, dl, NVT, Node->getOperand(1));
3481 // Perform the larger operation, then convert back
3482 Tmp1 = DAG.getNode(Node->getOpcode(), dl, NVT, Tmp1, Tmp2);
3483 Results.push_back(DAG.getNode(TruncOp, dl, OVT, Tmp1));
3487 unsigned ExtOp, TruncOp;
3488 if (Node->getValueType(0).isVector()) {
3489 ExtOp = ISD::BITCAST;
3490 TruncOp = ISD::BITCAST;
3491 } else if (Node->getValueType(0).isInteger()) {
3492 ExtOp = ISD::ANY_EXTEND;
3493 TruncOp = ISD::TRUNCATE;
3495 ExtOp = ISD::FP_EXTEND;
3496 TruncOp = ISD::FP_ROUND;
3498 Tmp1 = Node->getOperand(0);
3499 // Promote each of the values to the new type.
3500 Tmp2 = DAG.getNode(ExtOp, dl, NVT, Node->getOperand(1));
3501 Tmp3 = DAG.getNode(ExtOp, dl, NVT, Node->getOperand(2));
3502 // Perform the larger operation, then round down.
3503 Tmp1 = DAG.getNode(ISD::SELECT, dl, NVT, Tmp1, Tmp2, Tmp3);
3504 if (TruncOp != ISD::FP_ROUND)
3505 Tmp1 = DAG.getNode(TruncOp, dl, Node->getValueType(0), Tmp1);
3507 Tmp1 = DAG.getNode(TruncOp, dl, Node->getValueType(0), Tmp1,
3508 DAG.getIntPtrConstant(0));
3509 Results.push_back(Tmp1);
3512 case ISD::VECTOR_SHUFFLE: {
3513 SmallVector<int, 8> Mask;
3514 cast<ShuffleVectorSDNode>(Node)->getMask(Mask);
3516 // Cast the two input vectors.
3517 Tmp1 = DAG.getNode(ISD::BITCAST, dl, NVT, Node->getOperand(0));
3518 Tmp2 = DAG.getNode(ISD::BITCAST, dl, NVT, Node->getOperand(1));
3520 // Convert the shuffle mask to the right # elements.
3521 Tmp1 = ShuffleWithNarrowerEltType(NVT, OVT, dl, Tmp1, Tmp2, Mask);
3522 Tmp1 = DAG.getNode(ISD::BITCAST, dl, OVT, Tmp1);
3523 Results.push_back(Tmp1);
3527 unsigned ExtOp = ISD::FP_EXTEND;
3528 if (NVT.isInteger()) {
3529 ISD::CondCode CCCode =
3530 cast<CondCodeSDNode>(Node->getOperand(2))->get();
3531 ExtOp = isSignedIntSetCC(CCCode) ? ISD::SIGN_EXTEND : ISD::ZERO_EXTEND;
3533 Tmp1 = DAG.getNode(ExtOp, dl, NVT, Node->getOperand(0));
3534 Tmp2 = DAG.getNode(ExtOp, dl, NVT, Node->getOperand(1));
3535 Results.push_back(DAG.getNode(ISD::SETCC, dl, Node->getValueType(0),
3536 Tmp1, Tmp2, Node->getOperand(2)));
3541 // Replace the original node with the legalized result.
3542 if (!Results.empty())
3543 ReplaceNode(Node, Results.data());
3546 // SelectionDAG::Legalize - This is the entry point for the file.
3548 void SelectionDAG::Legalize() {
3549 /// run - This is the main entry point to this class.
3551 SelectionDAGLegalize(*this).LegalizeDAG();