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 ArrayRef<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 ArrayRef<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 // These operations lie about being legal: when they claim to be legal,
789 // they should actually be expanded.
790 Action = TLI.getOperationAction(Node->getOpcode(), Node->getValueType(0));
791 if (Action == TargetLowering::Legal)
792 Action = TargetLowering::Expand;
794 case ISD::INIT_TRAMPOLINE:
795 case ISD::ADJUST_TRAMPOLINE:
797 case ISD::RETURNADDR:
798 // These operations lie about being legal: when they claim to be legal,
799 // they should actually be custom-lowered.
800 Action = TLI.getOperationAction(Node->getOpcode(), Node->getValueType(0));
801 if (Action == TargetLowering::Legal)
802 Action = TargetLowering::Custom;
805 if (Node->getOpcode() >= ISD::BUILTIN_OP_END) {
806 Action = TargetLowering::Legal;
808 Action = TLI.getOperationAction(Node->getOpcode(), Node->getValueType(0));
813 if (SimpleFinishLegalizing) {
814 SmallVector<SDValue, 8> Ops;
815 for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i)
816 Ops.push_back(Node->getOperand(i));
817 switch (Node->getOpcode()) {
824 // Legalizing shifts/rotates requires adjusting the shift amount
825 // to the appropriate width.
826 if (!Ops[1].getValueType().isVector()) {
827 SDValue SAO = DAG.getShiftAmountOperand(Ops[0].getValueType(), Ops[1]);
828 HandleSDNode Handle(SAO);
829 LegalizeOp(SAO.getNode());
830 Ops[1] = Handle.getValue();
836 // Legalizing shifts/rotates requires adjusting the shift amount
837 // to the appropriate width.
838 if (!Ops[2].getValueType().isVector()) {
839 SDValue SAO = DAG.getShiftAmountOperand(Ops[0].getValueType(), Ops[2]);
840 HandleSDNode Handle(SAO);
841 LegalizeOp(SAO.getNode());
842 Ops[2] = Handle.getValue();
847 SDNode *NewNode = DAG.UpdateNodeOperands(Node, Ops.data(), Ops.size());
848 if (NewNode != Node) {
849 DAG.ReplaceAllUsesWith(Node, NewNode, this);
850 for (unsigned i = 0, e = Node->getNumValues(); i != e; ++i)
851 DAG.TransferDbgValues(SDValue(Node, i), SDValue(NewNode, i));
856 case TargetLowering::Legal:
858 case TargetLowering::Custom:
859 // FIXME: The handling for custom lowering with multiple results is
861 Tmp1 = TLI.LowerOperation(SDValue(Node, 0), DAG);
862 if (Tmp1.getNode()) {
863 SmallVector<SDValue, 8> ResultVals;
864 for (unsigned i = 0, e = Node->getNumValues(); i != e; ++i) {
866 ResultVals.push_back(Tmp1);
868 ResultVals.push_back(Tmp1.getValue(i));
870 if (Tmp1.getNode() != Node || Tmp1.getResNo() != 0) {
871 DAG.ReplaceAllUsesWith(Node, ResultVals.data(), this);
872 for (unsigned i = 0, e = Node->getNumValues(); i != e; ++i)
873 DAG.TransferDbgValues(SDValue(Node, i), ResultVals[i]);
880 case TargetLowering::Expand:
883 case TargetLowering::Promote:
889 switch (Node->getOpcode()) {
896 assert(0 && "Do not know how to legalize this operator!");
898 case ISD::CALLSEQ_START:
899 case ISD::CALLSEQ_END:
902 LoadSDNode *LD = cast<LoadSDNode>(Node);
903 Tmp1 = LD->getChain(); // Legalize the chain.
904 Tmp2 = LD->getBasePtr(); // Legalize the base pointer.
906 ISD::LoadExtType ExtType = LD->getExtensionType();
907 if (ExtType == ISD::NON_EXTLOAD) {
908 EVT VT = Node->getValueType(0);
909 Tmp3 = SDValue(Node, 0);
910 Tmp4 = SDValue(Node, 1);
912 switch (TLI.getOperationAction(Node->getOpcode(), VT)) {
913 default: assert(0 && "This action is not supported yet!");
914 case TargetLowering::Legal:
915 // If this is an unaligned load and the target doesn't support it,
917 if (!TLI.allowsUnalignedMemoryAccesses(LD->getMemoryVT())) {
918 Type *Ty = LD->getMemoryVT().getTypeForEVT(*DAG.getContext());
919 unsigned ABIAlignment = TLI.getTargetData()->getABITypeAlignment(Ty);
920 if (LD->getAlignment() < ABIAlignment){
921 ExpandUnalignedLoad(cast<LoadSDNode>(Node),
922 DAG, TLI, Tmp3, Tmp4);
926 case TargetLowering::Custom:
927 Tmp1 = TLI.LowerOperation(Tmp3, DAG);
928 if (Tmp1.getNode()) {
930 Tmp4 = Tmp1.getValue(1);
933 case TargetLowering::Promote: {
934 // Only promote a load of vector type to another.
935 assert(VT.isVector() && "Cannot promote this load!");
936 // Change base type to a different vector type.
937 EVT NVT = TLI.getTypeToPromoteTo(Node->getOpcode(), VT);
939 Tmp1 = DAG.getLoad(NVT, dl, Tmp1, Tmp2, LD->getPointerInfo(),
940 LD->isVolatile(), LD->isNonTemporal(),
941 LD->isInvariant(), LD->getAlignment());
942 Tmp3 = DAG.getNode(ISD::BITCAST, dl, VT, Tmp1);
943 Tmp4 = Tmp1.getValue(1);
947 if (Tmp4.getNode() != Node) {
948 assert(Tmp3.getNode() != Node && "Load must be completely replaced");
949 DAG.ReplaceAllUsesOfValueWith(SDValue(Node, 0), Tmp3);
950 DAG.ReplaceAllUsesOfValueWith(SDValue(Node, 1), Tmp4);
956 EVT SrcVT = LD->getMemoryVT();
957 unsigned SrcWidth = SrcVT.getSizeInBits();
958 unsigned Alignment = LD->getAlignment();
959 bool isVolatile = LD->isVolatile();
960 bool isNonTemporal = LD->isNonTemporal();
962 if (SrcWidth != SrcVT.getStoreSizeInBits() &&
963 // Some targets pretend to have an i1 loading operation, and actually
964 // load an i8. This trick is correct for ZEXTLOAD because the top 7
965 // bits are guaranteed to be zero; it helps the optimizers understand
966 // that these bits are zero. It is also useful for EXTLOAD, since it
967 // tells the optimizers that those bits are undefined. It would be
968 // nice to have an effective generic way of getting these benefits...
969 // Until such a way is found, don't insist on promoting i1 here.
971 TLI.getLoadExtAction(ExtType, MVT::i1) == TargetLowering::Promote)) {
972 // Promote to a byte-sized load if not loading an integral number of
973 // bytes. For example, promote EXTLOAD:i20 -> EXTLOAD:i24.
974 unsigned NewWidth = SrcVT.getStoreSizeInBits();
975 EVT NVT = EVT::getIntegerVT(*DAG.getContext(), NewWidth);
978 // The extra bits are guaranteed to be zero, since we stored them that
979 // way. A zext load from NVT thus automatically gives zext from SrcVT.
981 ISD::LoadExtType NewExtType =
982 ExtType == ISD::ZEXTLOAD ? ISD::ZEXTLOAD : ISD::EXTLOAD;
985 DAG.getExtLoad(NewExtType, dl, Node->getValueType(0),
986 Tmp1, Tmp2, LD->getPointerInfo(),
987 NVT, isVolatile, isNonTemporal, Alignment);
989 Ch = Result.getValue(1); // The chain.
991 if (ExtType == ISD::SEXTLOAD)
992 // Having the top bits zero doesn't help when sign extending.
993 Result = DAG.getNode(ISD::SIGN_EXTEND_INREG, dl,
994 Result.getValueType(),
995 Result, DAG.getValueType(SrcVT));
996 else if (ExtType == ISD::ZEXTLOAD || NVT == Result.getValueType())
997 // All the top bits are guaranteed to be zero - inform the optimizers.
998 Result = DAG.getNode(ISD::AssertZext, dl,
999 Result.getValueType(), Result,
1000 DAG.getValueType(SrcVT));
1004 } else if (SrcWidth & (SrcWidth - 1)) {
1005 // If not loading a power-of-2 number of bits, expand as two loads.
1006 assert(!SrcVT.isVector() && "Unsupported extload!");
1007 unsigned RoundWidth = 1 << Log2_32(SrcWidth);
1008 assert(RoundWidth < SrcWidth);
1009 unsigned ExtraWidth = SrcWidth - RoundWidth;
1010 assert(ExtraWidth < RoundWidth);
1011 assert(!(RoundWidth % 8) && !(ExtraWidth % 8) &&
1012 "Load size not an integral number of bytes!");
1013 EVT RoundVT = EVT::getIntegerVT(*DAG.getContext(), RoundWidth);
1014 EVT ExtraVT = EVT::getIntegerVT(*DAG.getContext(), ExtraWidth);
1016 unsigned IncrementSize;
1018 if (TLI.isLittleEndian()) {
1019 // EXTLOAD:i24 -> ZEXTLOAD:i16 | (shl EXTLOAD@+2:i8, 16)
1020 // Load the bottom RoundWidth bits.
1021 Lo = DAG.getExtLoad(ISD::ZEXTLOAD, dl, Node->getValueType(0),
1023 LD->getPointerInfo(), RoundVT, isVolatile,
1024 isNonTemporal, Alignment);
1026 // Load the remaining ExtraWidth bits.
1027 IncrementSize = RoundWidth / 8;
1028 Tmp2 = DAG.getNode(ISD::ADD, dl, Tmp2.getValueType(), Tmp2,
1029 DAG.getIntPtrConstant(IncrementSize));
1030 Hi = DAG.getExtLoad(ExtType, dl, Node->getValueType(0), Tmp1, Tmp2,
1031 LD->getPointerInfo().getWithOffset(IncrementSize),
1032 ExtraVT, isVolatile, isNonTemporal,
1033 MinAlign(Alignment, IncrementSize));
1035 // Build a factor node to remember that this load is independent of
1037 Ch = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Lo.getValue(1),
1040 // Move the top bits to the right place.
1041 Hi = DAG.getNode(ISD::SHL, dl, Hi.getValueType(), Hi,
1042 DAG.getConstant(RoundWidth,
1043 TLI.getShiftAmountTy(Hi.getValueType())));
1045 // Join the hi and lo parts.
1046 Tmp1 = DAG.getNode(ISD::OR, dl, Node->getValueType(0), Lo, Hi);
1048 // Big endian - avoid unaligned loads.
1049 // EXTLOAD:i24 -> (shl EXTLOAD:i16, 8) | ZEXTLOAD@+2:i8
1050 // Load the top RoundWidth bits.
1051 Hi = DAG.getExtLoad(ExtType, dl, Node->getValueType(0), Tmp1, Tmp2,
1052 LD->getPointerInfo(), RoundVT, isVolatile,
1053 isNonTemporal, Alignment);
1055 // Load the remaining ExtraWidth bits.
1056 IncrementSize = RoundWidth / 8;
1057 Tmp2 = DAG.getNode(ISD::ADD, dl, Tmp2.getValueType(), Tmp2,
1058 DAG.getIntPtrConstant(IncrementSize));
1059 Lo = DAG.getExtLoad(ISD::ZEXTLOAD,
1060 dl, Node->getValueType(0), Tmp1, Tmp2,
1061 LD->getPointerInfo().getWithOffset(IncrementSize),
1062 ExtraVT, isVolatile, isNonTemporal,
1063 MinAlign(Alignment, IncrementSize));
1065 // Build a factor node to remember that this load is independent of
1067 Ch = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Lo.getValue(1),
1070 // Move the top bits to the right place.
1071 Hi = DAG.getNode(ISD::SHL, dl, Hi.getValueType(), Hi,
1072 DAG.getConstant(ExtraWidth,
1073 TLI.getShiftAmountTy(Hi.getValueType())));
1075 // Join the hi and lo parts.
1076 Tmp1 = DAG.getNode(ISD::OR, dl, Node->getValueType(0), Lo, Hi);
1081 switch (TLI.getLoadExtAction(ExtType, SrcVT)) {
1082 default: assert(0 && "This action is not supported yet!");
1083 case TargetLowering::Custom:
1086 case TargetLowering::Legal:
1087 Tmp1 = SDValue(Node, 0);
1088 Tmp2 = SDValue(Node, 1);
1091 Tmp3 = TLI.LowerOperation(SDValue(Node, 0), DAG);
1092 if (Tmp3.getNode()) {
1094 Tmp2 = Tmp3.getValue(1);
1097 // If this is an unaligned load and the target doesn't support it,
1099 if (!TLI.allowsUnalignedMemoryAccesses(LD->getMemoryVT())) {
1101 LD->getMemoryVT().getTypeForEVT(*DAG.getContext());
1102 unsigned ABIAlignment =
1103 TLI.getTargetData()->getABITypeAlignment(Ty);
1104 if (LD->getAlignment() < ABIAlignment){
1105 ExpandUnalignedLoad(cast<LoadSDNode>(Node),
1106 DAG, TLI, Tmp1, Tmp2);
1111 case TargetLowering::Expand:
1112 if (!TLI.isLoadExtLegal(ISD::EXTLOAD, SrcVT) && TLI.isTypeLegal(SrcVT)) {
1113 SDValue Load = DAG.getLoad(SrcVT, dl, Tmp1, Tmp2,
1114 LD->getPointerInfo(),
1115 LD->isVolatile(), LD->isNonTemporal(),
1116 LD->isInvariant(), LD->getAlignment());
1120 ExtendOp = (SrcVT.isFloatingPoint() ?
1121 ISD::FP_EXTEND : ISD::ANY_EXTEND);
1123 case ISD::SEXTLOAD: ExtendOp = ISD::SIGN_EXTEND; break;
1124 case ISD::ZEXTLOAD: ExtendOp = ISD::ZERO_EXTEND; break;
1125 default: llvm_unreachable("Unexpected extend load type!");
1127 Tmp1 = DAG.getNode(ExtendOp, dl, Node->getValueType(0), Load);
1128 Tmp2 = Load.getValue(1);
1132 assert(!SrcVT.isVector() &&
1133 "Vector Loads are handled in LegalizeVectorOps");
1135 // FIXME: This does not work for vectors on most targets. Sign- and
1136 // zero-extend operations are currently folded into extending loads,
1137 // whether they are legal or not, and then we end up here without any
1138 // support for legalizing them.
1139 assert(ExtType != ISD::EXTLOAD &&
1140 "EXTLOAD should always be supported!");
1141 // Turn the unsupported load into an EXTLOAD followed by an explicit
1142 // zero/sign extend inreg.
1143 SDValue Result = DAG.getExtLoad(ISD::EXTLOAD, dl, Node->getValueType(0),
1144 Tmp1, Tmp2, LD->getPointerInfo(), SrcVT,
1145 LD->isVolatile(), LD->isNonTemporal(),
1146 LD->getAlignment());
1148 if (ExtType == ISD::SEXTLOAD)
1149 ValRes = DAG.getNode(ISD::SIGN_EXTEND_INREG, dl,
1150 Result.getValueType(),
1151 Result, DAG.getValueType(SrcVT));
1153 ValRes = DAG.getZeroExtendInReg(Result, dl, SrcVT.getScalarType());
1155 Tmp2 = Result.getValue(1);
1160 // Since loads produce two values, make sure to remember that we legalized
1162 if (Tmp2.getNode() != Node) {
1163 assert(Tmp1.getNode() != Node && "Load must be completely replaced");
1164 DAG.ReplaceAllUsesOfValueWith(SDValue(Node, 0), Tmp1);
1165 DAG.ReplaceAllUsesOfValueWith(SDValue(Node, 1), Tmp2);
1171 StoreSDNode *ST = cast<StoreSDNode>(Node);
1172 Tmp1 = ST->getChain();
1173 Tmp2 = ST->getBasePtr();
1174 unsigned Alignment = ST->getAlignment();
1175 bool isVolatile = ST->isVolatile();
1176 bool isNonTemporal = ST->isNonTemporal();
1178 if (!ST->isTruncatingStore()) {
1179 if (SDNode *OptStore = OptimizeFloatStore(ST).getNode()) {
1180 ReplaceNode(ST, OptStore);
1185 Tmp3 = ST->getValue();
1186 EVT VT = Tmp3.getValueType();
1187 switch (TLI.getOperationAction(ISD::STORE, VT)) {
1188 default: assert(0 && "This action is not supported yet!");
1189 case TargetLowering::Legal:
1190 // If this is an unaligned store and the target doesn't support it,
1192 if (!TLI.allowsUnalignedMemoryAccesses(ST->getMemoryVT())) {
1193 Type *Ty = ST->getMemoryVT().getTypeForEVT(*DAG.getContext());
1194 unsigned ABIAlignment= TLI.getTargetData()->getABITypeAlignment(Ty);
1195 if (ST->getAlignment() < ABIAlignment)
1196 ExpandUnalignedStore(cast<StoreSDNode>(Node),
1200 case TargetLowering::Custom:
1201 Tmp1 = TLI.LowerOperation(SDValue(Node, 0), DAG);
1203 ReplaceNode(SDValue(Node, 0), Tmp1);
1205 case TargetLowering::Promote: {
1206 assert(VT.isVector() && "Unknown legal promote case!");
1207 Tmp3 = DAG.getNode(ISD::BITCAST, dl,
1208 TLI.getTypeToPromoteTo(ISD::STORE, VT), Tmp3);
1210 DAG.getStore(Tmp1, dl, Tmp3, Tmp2,
1211 ST->getPointerInfo(), isVolatile,
1212 isNonTemporal, Alignment);
1213 ReplaceNode(SDValue(Node, 0), Result);
1220 Tmp3 = ST->getValue();
1222 EVT StVT = ST->getMemoryVT();
1223 unsigned StWidth = StVT.getSizeInBits();
1225 if (StWidth != StVT.getStoreSizeInBits()) {
1226 // Promote to a byte-sized store with upper bits zero if not
1227 // storing an integral number of bytes. For example, promote
1228 // TRUNCSTORE:i1 X -> TRUNCSTORE:i8 (and X, 1)
1229 EVT NVT = EVT::getIntegerVT(*DAG.getContext(),
1230 StVT.getStoreSizeInBits());
1231 Tmp3 = DAG.getZeroExtendInReg(Tmp3, dl, StVT);
1233 DAG.getTruncStore(Tmp1, dl, Tmp3, Tmp2, ST->getPointerInfo(),
1234 NVT, isVolatile, isNonTemporal, Alignment);
1235 ReplaceNode(SDValue(Node, 0), Result);
1236 } else if (StWidth & (StWidth - 1)) {
1237 // If not storing a power-of-2 number of bits, expand as two stores.
1238 assert(!StVT.isVector() && "Unsupported truncstore!");
1239 unsigned RoundWidth = 1 << Log2_32(StWidth);
1240 assert(RoundWidth < StWidth);
1241 unsigned ExtraWidth = StWidth - RoundWidth;
1242 assert(ExtraWidth < RoundWidth);
1243 assert(!(RoundWidth % 8) && !(ExtraWidth % 8) &&
1244 "Store size not an integral number of bytes!");
1245 EVT RoundVT = EVT::getIntegerVT(*DAG.getContext(), RoundWidth);
1246 EVT ExtraVT = EVT::getIntegerVT(*DAG.getContext(), ExtraWidth);
1248 unsigned IncrementSize;
1250 if (TLI.isLittleEndian()) {
1251 // TRUNCSTORE:i24 X -> TRUNCSTORE:i16 X, TRUNCSTORE@+2:i8 (srl X, 16)
1252 // Store the bottom RoundWidth bits.
1253 Lo = DAG.getTruncStore(Tmp1, dl, Tmp3, Tmp2, ST->getPointerInfo(),
1255 isVolatile, isNonTemporal, Alignment);
1257 // Store the remaining ExtraWidth bits.
1258 IncrementSize = RoundWidth / 8;
1259 Tmp2 = DAG.getNode(ISD::ADD, dl, Tmp2.getValueType(), Tmp2,
1260 DAG.getIntPtrConstant(IncrementSize));
1261 Hi = DAG.getNode(ISD::SRL, dl, Tmp3.getValueType(), Tmp3,
1262 DAG.getConstant(RoundWidth,
1263 TLI.getShiftAmountTy(Tmp3.getValueType())));
1264 Hi = DAG.getTruncStore(Tmp1, dl, Hi, Tmp2,
1265 ST->getPointerInfo().getWithOffset(IncrementSize),
1266 ExtraVT, isVolatile, isNonTemporal,
1267 MinAlign(Alignment, IncrementSize));
1269 // Big endian - avoid unaligned stores.
1270 // TRUNCSTORE:i24 X -> TRUNCSTORE:i16 (srl X, 8), TRUNCSTORE@+2:i8 X
1271 // Store the top RoundWidth bits.
1272 Hi = DAG.getNode(ISD::SRL, dl, Tmp3.getValueType(), Tmp3,
1273 DAG.getConstant(ExtraWidth,
1274 TLI.getShiftAmountTy(Tmp3.getValueType())));
1275 Hi = DAG.getTruncStore(Tmp1, dl, Hi, Tmp2, ST->getPointerInfo(),
1276 RoundVT, isVolatile, isNonTemporal, Alignment);
1278 // Store the remaining ExtraWidth bits.
1279 IncrementSize = RoundWidth / 8;
1280 Tmp2 = DAG.getNode(ISD::ADD, dl, Tmp2.getValueType(), Tmp2,
1281 DAG.getIntPtrConstant(IncrementSize));
1282 Lo = DAG.getTruncStore(Tmp1, dl, Tmp3, Tmp2,
1283 ST->getPointerInfo().getWithOffset(IncrementSize),
1284 ExtraVT, isVolatile, isNonTemporal,
1285 MinAlign(Alignment, IncrementSize));
1288 // The order of the stores doesn't matter.
1289 SDValue Result = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Lo, Hi);
1290 ReplaceNode(SDValue(Node, 0), Result);
1292 switch (TLI.getTruncStoreAction(ST->getValue().getValueType(), StVT)) {
1293 default: assert(0 && "This action is not supported yet!");
1294 case TargetLowering::Legal:
1295 // If this is an unaligned store and the target doesn't support it,
1297 if (!TLI.allowsUnalignedMemoryAccesses(ST->getMemoryVT())) {
1298 Type *Ty = ST->getMemoryVT().getTypeForEVT(*DAG.getContext());
1299 unsigned ABIAlignment= TLI.getTargetData()->getABITypeAlignment(Ty);
1300 if (ST->getAlignment() < ABIAlignment)
1301 ExpandUnalignedStore(cast<StoreSDNode>(Node), DAG, TLI, this);
1304 case TargetLowering::Custom:
1305 ReplaceNode(SDValue(Node, 0),
1306 TLI.LowerOperation(SDValue(Node, 0), DAG));
1308 case TargetLowering::Expand:
1309 assert(!StVT.isVector() &&
1310 "Vector Stores are handled in LegalizeVectorOps");
1312 // TRUNCSTORE:i16 i32 -> STORE i16
1313 assert(TLI.isTypeLegal(StVT) && "Do not know how to expand this store!");
1314 Tmp3 = DAG.getNode(ISD::TRUNCATE, dl, StVT, Tmp3);
1316 DAG.getStore(Tmp1, dl, Tmp3, Tmp2, ST->getPointerInfo(),
1317 isVolatile, isNonTemporal, Alignment);
1318 ReplaceNode(SDValue(Node, 0), Result);
1328 SDValue SelectionDAGLegalize::ExpandExtractFromVectorThroughStack(SDValue Op) {
1329 SDValue Vec = Op.getOperand(0);
1330 SDValue Idx = Op.getOperand(1);
1331 DebugLoc dl = Op.getDebugLoc();
1332 // Store the value to a temporary stack slot, then LOAD the returned part.
1333 SDValue StackPtr = DAG.CreateStackTemporary(Vec.getValueType());
1334 SDValue Ch = DAG.getStore(DAG.getEntryNode(), dl, Vec, StackPtr,
1335 MachinePointerInfo(), false, false, 0);
1337 // Add the offset to the index.
1339 Vec.getValueType().getVectorElementType().getSizeInBits()/8;
1340 Idx = DAG.getNode(ISD::MUL, dl, Idx.getValueType(), Idx,
1341 DAG.getConstant(EltSize, Idx.getValueType()));
1343 if (Idx.getValueType().bitsGT(TLI.getPointerTy()))
1344 Idx = DAG.getNode(ISD::TRUNCATE, dl, TLI.getPointerTy(), Idx);
1346 Idx = DAG.getNode(ISD::ZERO_EXTEND, dl, TLI.getPointerTy(), Idx);
1348 StackPtr = DAG.getNode(ISD::ADD, dl, Idx.getValueType(), Idx, StackPtr);
1350 if (Op.getValueType().isVector())
1351 return DAG.getLoad(Op.getValueType(), dl, Ch, StackPtr,MachinePointerInfo(),
1352 false, false, false, 0);
1353 return DAG.getExtLoad(ISD::EXTLOAD, dl, Op.getValueType(), Ch, StackPtr,
1354 MachinePointerInfo(),
1355 Vec.getValueType().getVectorElementType(),
1359 SDValue SelectionDAGLegalize::ExpandInsertToVectorThroughStack(SDValue Op) {
1360 assert(Op.getValueType().isVector() && "Non-vector insert subvector!");
1362 SDValue Vec = Op.getOperand(0);
1363 SDValue Part = Op.getOperand(1);
1364 SDValue Idx = Op.getOperand(2);
1365 DebugLoc dl = Op.getDebugLoc();
1367 // Store the value to a temporary stack slot, then LOAD the returned part.
1369 SDValue StackPtr = DAG.CreateStackTemporary(Vec.getValueType());
1370 int FI = cast<FrameIndexSDNode>(StackPtr.getNode())->getIndex();
1371 MachinePointerInfo PtrInfo = MachinePointerInfo::getFixedStack(FI);
1373 // First store the whole vector.
1374 SDValue Ch = DAG.getStore(DAG.getEntryNode(), dl, Vec, StackPtr, PtrInfo,
1377 // Then store the inserted part.
1379 // Add the offset to the index.
1381 Vec.getValueType().getVectorElementType().getSizeInBits()/8;
1383 Idx = DAG.getNode(ISD::MUL, dl, Idx.getValueType(), Idx,
1384 DAG.getConstant(EltSize, Idx.getValueType()));
1386 if (Idx.getValueType().bitsGT(TLI.getPointerTy()))
1387 Idx = DAG.getNode(ISD::TRUNCATE, dl, TLI.getPointerTy(), Idx);
1389 Idx = DAG.getNode(ISD::ZERO_EXTEND, dl, TLI.getPointerTy(), Idx);
1391 SDValue SubStackPtr = DAG.getNode(ISD::ADD, dl, Idx.getValueType(), Idx,
1394 // Store the subvector.
1395 Ch = DAG.getStore(DAG.getEntryNode(), dl, Part, SubStackPtr,
1396 MachinePointerInfo(), false, false, 0);
1398 // Finally, load the updated vector.
1399 return DAG.getLoad(Op.getValueType(), dl, Ch, StackPtr, PtrInfo,
1400 false, false, false, 0);
1403 SDValue SelectionDAGLegalize::ExpandVectorBuildThroughStack(SDNode* Node) {
1404 // We can't handle this case efficiently. Allocate a sufficiently
1405 // aligned object on the stack, store each element into it, then load
1406 // the result as a vector.
1407 // Create the stack frame object.
1408 EVT VT = Node->getValueType(0);
1409 EVT EltVT = VT.getVectorElementType();
1410 DebugLoc dl = Node->getDebugLoc();
1411 SDValue FIPtr = DAG.CreateStackTemporary(VT);
1412 int FI = cast<FrameIndexSDNode>(FIPtr.getNode())->getIndex();
1413 MachinePointerInfo PtrInfo = MachinePointerInfo::getFixedStack(FI);
1415 // Emit a store of each element to the stack slot.
1416 SmallVector<SDValue, 8> Stores;
1417 unsigned TypeByteSize = EltVT.getSizeInBits() / 8;
1418 // Store (in the right endianness) the elements to memory.
1419 for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i) {
1420 // Ignore undef elements.
1421 if (Node->getOperand(i).getOpcode() == ISD::UNDEF) continue;
1423 unsigned Offset = TypeByteSize*i;
1425 SDValue Idx = DAG.getConstant(Offset, FIPtr.getValueType());
1426 Idx = DAG.getNode(ISD::ADD, dl, FIPtr.getValueType(), FIPtr, Idx);
1428 // If the destination vector element type is narrower than the source
1429 // element type, only store the bits necessary.
1430 if (EltVT.bitsLT(Node->getOperand(i).getValueType().getScalarType())) {
1431 Stores.push_back(DAG.getTruncStore(DAG.getEntryNode(), dl,
1432 Node->getOperand(i), Idx,
1433 PtrInfo.getWithOffset(Offset),
1434 EltVT, false, false, 0));
1436 Stores.push_back(DAG.getStore(DAG.getEntryNode(), dl,
1437 Node->getOperand(i), Idx,
1438 PtrInfo.getWithOffset(Offset),
1443 if (!Stores.empty()) // Not all undef elements?
1444 StoreChain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
1445 &Stores[0], Stores.size());
1447 StoreChain = DAG.getEntryNode();
1449 // Result is a load from the stack slot.
1450 return DAG.getLoad(VT, dl, StoreChain, FIPtr, PtrInfo,
1451 false, false, false, 0);
1454 SDValue SelectionDAGLegalize::ExpandFCOPYSIGN(SDNode* Node) {
1455 DebugLoc dl = Node->getDebugLoc();
1456 SDValue Tmp1 = Node->getOperand(0);
1457 SDValue Tmp2 = Node->getOperand(1);
1459 // Get the sign bit of the RHS. First obtain a value that has the same
1460 // sign as the sign bit, i.e. negative if and only if the sign bit is 1.
1462 EVT FloatVT = Tmp2.getValueType();
1463 EVT IVT = EVT::getIntegerVT(*DAG.getContext(), FloatVT.getSizeInBits());
1464 if (TLI.isTypeLegal(IVT)) {
1465 // Convert to an integer with the same sign bit.
1466 SignBit = DAG.getNode(ISD::BITCAST, dl, IVT, Tmp2);
1468 // Store the float to memory, then load the sign part out as an integer.
1469 MVT LoadTy = TLI.getPointerTy();
1470 // First create a temporary that is aligned for both the load and store.
1471 SDValue StackPtr = DAG.CreateStackTemporary(FloatVT, LoadTy);
1472 // Then store the float to it.
1474 DAG.getStore(DAG.getEntryNode(), dl, Tmp2, StackPtr, MachinePointerInfo(),
1476 if (TLI.isBigEndian()) {
1477 assert(FloatVT.isByteSized() && "Unsupported floating point type!");
1478 // Load out a legal integer with the same sign bit as the float.
1479 SignBit = DAG.getLoad(LoadTy, dl, Ch, StackPtr, MachinePointerInfo(),
1480 false, false, false, 0);
1481 } else { // Little endian
1482 SDValue LoadPtr = StackPtr;
1483 // The float may be wider than the integer we are going to load. Advance
1484 // the pointer so that the loaded integer will contain the sign bit.
1485 unsigned Strides = (FloatVT.getSizeInBits()-1)/LoadTy.getSizeInBits();
1486 unsigned ByteOffset = (Strides * LoadTy.getSizeInBits()) / 8;
1487 LoadPtr = DAG.getNode(ISD::ADD, dl, LoadPtr.getValueType(),
1488 LoadPtr, DAG.getIntPtrConstant(ByteOffset));
1489 // Load a legal integer containing the sign bit.
1490 SignBit = DAG.getLoad(LoadTy, dl, Ch, LoadPtr, MachinePointerInfo(),
1491 false, false, false, 0);
1492 // Move the sign bit to the top bit of the loaded integer.
1493 unsigned BitShift = LoadTy.getSizeInBits() -
1494 (FloatVT.getSizeInBits() - 8 * ByteOffset);
1495 assert(BitShift < LoadTy.getSizeInBits() && "Pointer advanced wrong?");
1497 SignBit = DAG.getNode(ISD::SHL, dl, LoadTy, SignBit,
1498 DAG.getConstant(BitShift,
1499 TLI.getShiftAmountTy(SignBit.getValueType())));
1502 // Now get the sign bit proper, by seeing whether the value is negative.
1503 SignBit = DAG.getSetCC(dl, TLI.getSetCCResultType(SignBit.getValueType()),
1504 SignBit, DAG.getConstant(0, SignBit.getValueType()),
1506 // Get the absolute value of the result.
1507 SDValue AbsVal = DAG.getNode(ISD::FABS, dl, Tmp1.getValueType(), Tmp1);
1508 // Select between the nabs and abs value based on the sign bit of
1510 return DAG.getNode(ISD::SELECT, dl, AbsVal.getValueType(), SignBit,
1511 DAG.getNode(ISD::FNEG, dl, AbsVal.getValueType(), AbsVal),
1515 void SelectionDAGLegalize::ExpandDYNAMIC_STACKALLOC(SDNode* Node,
1516 SmallVectorImpl<SDValue> &Results) {
1517 unsigned SPReg = TLI.getStackPointerRegisterToSaveRestore();
1518 assert(SPReg && "Target cannot require DYNAMIC_STACKALLOC expansion and"
1519 " not tell us which reg is the stack pointer!");
1520 DebugLoc dl = Node->getDebugLoc();
1521 EVT VT = Node->getValueType(0);
1522 SDValue Tmp1 = SDValue(Node, 0);
1523 SDValue Tmp2 = SDValue(Node, 1);
1524 SDValue Tmp3 = Node->getOperand(2);
1525 SDValue Chain = Tmp1.getOperand(0);
1527 // Chain the dynamic stack allocation so that it doesn't modify the stack
1528 // pointer when other instructions are using the stack.
1529 Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(0, true));
1531 SDValue Size = Tmp2.getOperand(1);
1532 SDValue SP = DAG.getCopyFromReg(Chain, dl, SPReg, VT);
1533 Chain = SP.getValue(1);
1534 unsigned Align = cast<ConstantSDNode>(Tmp3)->getZExtValue();
1535 unsigned StackAlign = TM.getFrameLowering()->getStackAlignment();
1536 if (Align > StackAlign)
1537 SP = DAG.getNode(ISD::AND, dl, VT, SP,
1538 DAG.getConstant(-(uint64_t)Align, VT));
1539 Tmp1 = DAG.getNode(ISD::SUB, dl, VT, SP, Size); // Value
1540 Chain = DAG.getCopyToReg(Chain, dl, SPReg, Tmp1); // Output chain
1542 Tmp2 = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(0, true),
1543 DAG.getIntPtrConstant(0, true), SDValue());
1545 Results.push_back(Tmp1);
1546 Results.push_back(Tmp2);
1549 /// LegalizeSetCCCondCode - Legalize a SETCC with given LHS and RHS and
1550 /// condition code CC on the current target. This routine expands SETCC with
1551 /// illegal condition code into AND / OR of multiple SETCC values.
1552 void SelectionDAGLegalize::LegalizeSetCCCondCode(EVT VT,
1553 SDValue &LHS, SDValue &RHS,
1556 EVT OpVT = LHS.getValueType();
1557 ISD::CondCode CCCode = cast<CondCodeSDNode>(CC)->get();
1558 switch (TLI.getCondCodeAction(CCCode, OpVT)) {
1559 default: assert(0 && "Unknown condition code action!");
1560 case TargetLowering::Legal:
1563 case TargetLowering::Expand: {
1564 ISD::CondCode CC1 = ISD::SETCC_INVALID, CC2 = ISD::SETCC_INVALID;
1567 default: assert(0 && "Don't know how to expand this condition!");
1568 case ISD::SETOEQ: CC1 = ISD::SETEQ; CC2 = ISD::SETO; Opc = ISD::AND; break;
1569 case ISD::SETOGT: CC1 = ISD::SETGT; CC2 = ISD::SETO; Opc = ISD::AND; break;
1570 case ISD::SETOGE: CC1 = ISD::SETGE; CC2 = ISD::SETO; Opc = ISD::AND; break;
1571 case ISD::SETOLT: CC1 = ISD::SETLT; CC2 = ISD::SETO; Opc = ISD::AND; break;
1572 case ISD::SETOLE: CC1 = ISD::SETLE; CC2 = ISD::SETO; Opc = ISD::AND; break;
1573 case ISD::SETONE: CC1 = ISD::SETNE; CC2 = ISD::SETO; Opc = ISD::AND; break;
1574 case ISD::SETUEQ: CC1 = ISD::SETEQ; CC2 = ISD::SETUO; Opc = ISD::OR; break;
1575 case ISD::SETUGT: CC1 = ISD::SETGT; CC2 = ISD::SETUO; Opc = ISD::OR; break;
1576 case ISD::SETUGE: CC1 = ISD::SETGE; CC2 = ISD::SETUO; Opc = ISD::OR; break;
1577 case ISD::SETULT: CC1 = ISD::SETLT; CC2 = ISD::SETUO; Opc = ISD::OR; break;
1578 case ISD::SETULE: CC1 = ISD::SETLE; CC2 = ISD::SETUO; Opc = ISD::OR; break;
1579 case ISD::SETUNE: CC1 = ISD::SETNE; CC2 = ISD::SETUO; Opc = ISD::OR; break;
1580 // FIXME: Implement more expansions.
1583 SDValue SetCC1 = DAG.getSetCC(dl, VT, LHS, RHS, CC1);
1584 SDValue SetCC2 = DAG.getSetCC(dl, VT, LHS, RHS, CC2);
1585 LHS = DAG.getNode(Opc, dl, VT, SetCC1, SetCC2);
1593 /// EmitStackConvert - Emit a store/load combination to the stack. This stores
1594 /// SrcOp to a stack slot of type SlotVT, truncating it if needed. It then does
1595 /// a load from the stack slot to DestVT, extending it if needed.
1596 /// The resultant code need not be legal.
1597 SDValue SelectionDAGLegalize::EmitStackConvert(SDValue SrcOp,
1601 // Create the stack frame object.
1603 TLI.getTargetData()->getPrefTypeAlignment(SrcOp.getValueType().
1604 getTypeForEVT(*DAG.getContext()));
1605 SDValue FIPtr = DAG.CreateStackTemporary(SlotVT, SrcAlign);
1607 FrameIndexSDNode *StackPtrFI = cast<FrameIndexSDNode>(FIPtr);
1608 int SPFI = StackPtrFI->getIndex();
1609 MachinePointerInfo PtrInfo = MachinePointerInfo::getFixedStack(SPFI);
1611 unsigned SrcSize = SrcOp.getValueType().getSizeInBits();
1612 unsigned SlotSize = SlotVT.getSizeInBits();
1613 unsigned DestSize = DestVT.getSizeInBits();
1614 Type *DestType = DestVT.getTypeForEVT(*DAG.getContext());
1615 unsigned DestAlign = TLI.getTargetData()->getPrefTypeAlignment(DestType);
1617 // Emit a store to the stack slot. Use a truncstore if the input value is
1618 // later than DestVT.
1621 if (SrcSize > SlotSize)
1622 Store = DAG.getTruncStore(DAG.getEntryNode(), dl, SrcOp, FIPtr,
1623 PtrInfo, SlotVT, false, false, SrcAlign);
1625 assert(SrcSize == SlotSize && "Invalid store");
1626 Store = DAG.getStore(DAG.getEntryNode(), dl, SrcOp, FIPtr,
1627 PtrInfo, false, false, SrcAlign);
1630 // Result is a load from the stack slot.
1631 if (SlotSize == DestSize)
1632 return DAG.getLoad(DestVT, dl, Store, FIPtr, PtrInfo,
1633 false, false, false, DestAlign);
1635 assert(SlotSize < DestSize && "Unknown extension!");
1636 return DAG.getExtLoad(ISD::EXTLOAD, dl, DestVT, Store, FIPtr,
1637 PtrInfo, SlotVT, false, false, DestAlign);
1640 SDValue SelectionDAGLegalize::ExpandSCALAR_TO_VECTOR(SDNode *Node) {
1641 DebugLoc dl = Node->getDebugLoc();
1642 // Create a vector sized/aligned stack slot, store the value to element #0,
1643 // then load the whole vector back out.
1644 SDValue StackPtr = DAG.CreateStackTemporary(Node->getValueType(0));
1646 FrameIndexSDNode *StackPtrFI = cast<FrameIndexSDNode>(StackPtr);
1647 int SPFI = StackPtrFI->getIndex();
1649 SDValue Ch = DAG.getTruncStore(DAG.getEntryNode(), dl, Node->getOperand(0),
1651 MachinePointerInfo::getFixedStack(SPFI),
1652 Node->getValueType(0).getVectorElementType(),
1654 return DAG.getLoad(Node->getValueType(0), dl, Ch, StackPtr,
1655 MachinePointerInfo::getFixedStack(SPFI),
1656 false, false, false, 0);
1660 /// ExpandBUILD_VECTOR - Expand a BUILD_VECTOR node on targets that don't
1661 /// support the operation, but do support the resultant vector type.
1662 SDValue SelectionDAGLegalize::ExpandBUILD_VECTOR(SDNode *Node) {
1663 unsigned NumElems = Node->getNumOperands();
1664 SDValue Value1, Value2;
1665 DebugLoc dl = Node->getDebugLoc();
1666 EVT VT = Node->getValueType(0);
1667 EVT OpVT = Node->getOperand(0).getValueType();
1668 EVT EltVT = VT.getVectorElementType();
1670 // If the only non-undef value is the low element, turn this into a
1671 // SCALAR_TO_VECTOR node. If this is { X, X, X, X }, determine X.
1672 bool isOnlyLowElement = true;
1673 bool MoreThanTwoValues = false;
1674 bool isConstant = true;
1675 for (unsigned i = 0; i < NumElems; ++i) {
1676 SDValue V = Node->getOperand(i);
1677 if (V.getOpcode() == ISD::UNDEF)
1680 isOnlyLowElement = false;
1681 if (!isa<ConstantFPSDNode>(V) && !isa<ConstantSDNode>(V))
1684 if (!Value1.getNode()) {
1686 } else if (!Value2.getNode()) {
1689 } else if (V != Value1 && V != Value2) {
1690 MoreThanTwoValues = true;
1694 if (!Value1.getNode())
1695 return DAG.getUNDEF(VT);
1697 if (isOnlyLowElement)
1698 return DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Node->getOperand(0));
1700 // If all elements are constants, create a load from the constant pool.
1702 SmallVector<Constant*, 16> CV;
1703 for (unsigned i = 0, e = NumElems; i != e; ++i) {
1704 if (ConstantFPSDNode *V =
1705 dyn_cast<ConstantFPSDNode>(Node->getOperand(i))) {
1706 CV.push_back(const_cast<ConstantFP *>(V->getConstantFPValue()));
1707 } else if (ConstantSDNode *V =
1708 dyn_cast<ConstantSDNode>(Node->getOperand(i))) {
1710 CV.push_back(const_cast<ConstantInt *>(V->getConstantIntValue()));
1712 // If OpVT and EltVT don't match, EltVT is not legal and the
1713 // element values have been promoted/truncated earlier. Undo this;
1714 // we don't want a v16i8 to become a v16i32 for example.
1715 const ConstantInt *CI = V->getConstantIntValue();
1716 CV.push_back(ConstantInt::get(EltVT.getTypeForEVT(*DAG.getContext()),
1717 CI->getZExtValue()));
1720 assert(Node->getOperand(i).getOpcode() == ISD::UNDEF);
1721 Type *OpNTy = EltVT.getTypeForEVT(*DAG.getContext());
1722 CV.push_back(UndefValue::get(OpNTy));
1725 Constant *CP = ConstantVector::get(CV);
1726 SDValue CPIdx = DAG.getConstantPool(CP, TLI.getPointerTy());
1727 unsigned Alignment = cast<ConstantPoolSDNode>(CPIdx)->getAlignment();
1728 return DAG.getLoad(VT, dl, DAG.getEntryNode(), CPIdx,
1729 MachinePointerInfo::getConstantPool(),
1730 false, false, false, Alignment);
1733 if (!MoreThanTwoValues) {
1734 SmallVector<int, 8> ShuffleVec(NumElems, -1);
1735 for (unsigned i = 0; i < NumElems; ++i) {
1736 SDValue V = Node->getOperand(i);
1737 if (V.getOpcode() == ISD::UNDEF)
1739 ShuffleVec[i] = V == Value1 ? 0 : NumElems;
1741 if (TLI.isShuffleMaskLegal(ShuffleVec, Node->getValueType(0))) {
1742 // Get the splatted value into the low element of a vector register.
1743 SDValue Vec1 = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Value1);
1745 if (Value2.getNode())
1746 Vec2 = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Value2);
1748 Vec2 = DAG.getUNDEF(VT);
1750 // Return shuffle(LowValVec, undef, <0,0,0,0>)
1751 return DAG.getVectorShuffle(VT, dl, Vec1, Vec2, ShuffleVec.data());
1755 // Otherwise, we can't handle this case efficiently.
1756 return ExpandVectorBuildThroughStack(Node);
1759 // ExpandLibCall - Expand a node into a call to a libcall. If the result value
1760 // does not fit into a register, return the lo part and set the hi part to the
1761 // by-reg argument. If it does fit into a single register, return the result
1762 // and leave the Hi part unset.
1763 SDValue SelectionDAGLegalize::ExpandLibCall(RTLIB::Libcall LC, SDNode *Node,
1765 // The input chain to this libcall is the entry node of the function.
1766 // Legalizing the call will automatically add the previous call to the
1768 SDValue InChain = DAG.getEntryNode();
1770 TargetLowering::ArgListTy Args;
1771 TargetLowering::ArgListEntry Entry;
1772 for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i) {
1773 EVT ArgVT = Node->getOperand(i).getValueType();
1774 Type *ArgTy = ArgVT.getTypeForEVT(*DAG.getContext());
1775 Entry.Node = Node->getOperand(i); Entry.Ty = ArgTy;
1776 Entry.isSExt = isSigned;
1777 Entry.isZExt = !isSigned;
1778 Args.push_back(Entry);
1780 SDValue Callee = DAG.getExternalSymbol(TLI.getLibcallName(LC),
1781 TLI.getPointerTy());
1783 Type *RetTy = Node->getValueType(0).getTypeForEVT(*DAG.getContext());
1785 // isTailCall may be true since the callee does not reference caller stack
1786 // frame. Check if it's in the right position.
1787 bool isTailCall = isInTailCallPosition(DAG, Node, TLI);
1788 std::pair<SDValue, SDValue> CallInfo =
1789 TLI.LowerCallTo(InChain, RetTy, isSigned, !isSigned, false, false,
1790 0, TLI.getLibcallCallingConv(LC), isTailCall,
1791 /*isReturnValueUsed=*/true,
1792 Callee, Args, DAG, Node->getDebugLoc());
1794 if (!CallInfo.second.getNode())
1795 // It's a tailcall, return the chain (which is the DAG root).
1796 return DAG.getRoot();
1798 return CallInfo.first;
1801 /// ExpandLibCall - Generate a libcall taking the given operands as arguments
1802 /// and returning a result of type RetVT.
1803 SDValue SelectionDAGLegalize::ExpandLibCall(RTLIB::Libcall LC, EVT RetVT,
1804 const SDValue *Ops, unsigned NumOps,
1805 bool isSigned, DebugLoc dl) {
1806 TargetLowering::ArgListTy Args;
1807 Args.reserve(NumOps);
1809 TargetLowering::ArgListEntry Entry;
1810 for (unsigned i = 0; i != NumOps; ++i) {
1811 Entry.Node = Ops[i];
1812 Entry.Ty = Entry.Node.getValueType().getTypeForEVT(*DAG.getContext());
1813 Entry.isSExt = isSigned;
1814 Entry.isZExt = !isSigned;
1815 Args.push_back(Entry);
1817 SDValue Callee = DAG.getExternalSymbol(TLI.getLibcallName(LC),
1818 TLI.getPointerTy());
1820 Type *RetTy = RetVT.getTypeForEVT(*DAG.getContext());
1821 std::pair<SDValue,SDValue> CallInfo =
1822 TLI.LowerCallTo(DAG.getEntryNode(), RetTy, isSigned, !isSigned, false,
1823 false, 0, TLI.getLibcallCallingConv(LC), false,
1824 /*isReturnValueUsed=*/true,
1825 Callee, Args, DAG, dl);
1827 return CallInfo.first;
1830 // ExpandChainLibCall - Expand a node into a call to a libcall. Similar to
1831 // ExpandLibCall except that the first operand is the in-chain.
1832 std::pair<SDValue, SDValue>
1833 SelectionDAGLegalize::ExpandChainLibCall(RTLIB::Libcall LC,
1836 SDValue InChain = Node->getOperand(0);
1838 TargetLowering::ArgListTy Args;
1839 TargetLowering::ArgListEntry Entry;
1840 for (unsigned i = 1, e = Node->getNumOperands(); i != e; ++i) {
1841 EVT ArgVT = Node->getOperand(i).getValueType();
1842 Type *ArgTy = ArgVT.getTypeForEVT(*DAG.getContext());
1843 Entry.Node = Node->getOperand(i);
1845 Entry.isSExt = isSigned;
1846 Entry.isZExt = !isSigned;
1847 Args.push_back(Entry);
1849 SDValue Callee = DAG.getExternalSymbol(TLI.getLibcallName(LC),
1850 TLI.getPointerTy());
1852 Type *RetTy = Node->getValueType(0).getTypeForEVT(*DAG.getContext());
1853 std::pair<SDValue, SDValue> CallInfo =
1854 TLI.LowerCallTo(InChain, RetTy, isSigned, !isSigned, false, false,
1855 0, TLI.getLibcallCallingConv(LC), /*isTailCall=*/false,
1856 /*isReturnValueUsed=*/true,
1857 Callee, Args, DAG, Node->getDebugLoc());
1862 SDValue SelectionDAGLegalize::ExpandFPLibCall(SDNode* Node,
1863 RTLIB::Libcall Call_F32,
1864 RTLIB::Libcall Call_F64,
1865 RTLIB::Libcall Call_F80,
1866 RTLIB::Libcall Call_PPCF128) {
1868 switch (Node->getValueType(0).getSimpleVT().SimpleTy) {
1869 default: assert(0 && "Unexpected request for libcall!");
1870 case MVT::f32: LC = Call_F32; break;
1871 case MVT::f64: LC = Call_F64; break;
1872 case MVT::f80: LC = Call_F80; break;
1873 case MVT::ppcf128: LC = Call_PPCF128; break;
1875 return ExpandLibCall(LC, Node, false);
1878 SDValue SelectionDAGLegalize::ExpandIntLibCall(SDNode* Node, bool isSigned,
1879 RTLIB::Libcall Call_I8,
1880 RTLIB::Libcall Call_I16,
1881 RTLIB::Libcall Call_I32,
1882 RTLIB::Libcall Call_I64,
1883 RTLIB::Libcall Call_I128) {
1885 switch (Node->getValueType(0).getSimpleVT().SimpleTy) {
1886 default: assert(0 && "Unexpected request for libcall!");
1887 case MVT::i8: LC = Call_I8; break;
1888 case MVT::i16: LC = Call_I16; break;
1889 case MVT::i32: LC = Call_I32; break;
1890 case MVT::i64: LC = Call_I64; break;
1891 case MVT::i128: LC = Call_I128; break;
1893 return ExpandLibCall(LC, Node, isSigned);
1896 /// isDivRemLibcallAvailable - Return true if divmod libcall is available.
1897 static bool isDivRemLibcallAvailable(SDNode *Node, bool isSigned,
1898 const TargetLowering &TLI) {
1900 switch (Node->getValueType(0).getSimpleVT().SimpleTy) {
1901 default: assert(0 && "Unexpected request for libcall!");
1902 case MVT::i8: LC= isSigned ? RTLIB::SDIVREM_I8 : RTLIB::UDIVREM_I8; break;
1903 case MVT::i16: LC= isSigned ? RTLIB::SDIVREM_I16 : RTLIB::UDIVREM_I16; break;
1904 case MVT::i32: LC= isSigned ? RTLIB::SDIVREM_I32 : RTLIB::UDIVREM_I32; break;
1905 case MVT::i64: LC= isSigned ? RTLIB::SDIVREM_I64 : RTLIB::UDIVREM_I64; break;
1906 case MVT::i128: LC= isSigned ? RTLIB::SDIVREM_I128:RTLIB::UDIVREM_I128; break;
1909 return TLI.getLibcallName(LC) != 0;
1912 /// UseDivRem - Only issue divrem libcall if both quotient and remainder are
1914 static bool UseDivRem(SDNode *Node, bool isSigned, bool isDIV) {
1915 unsigned OtherOpcode = 0;
1917 OtherOpcode = isDIV ? ISD::SREM : ISD::SDIV;
1919 OtherOpcode = isDIV ? ISD::UREM : ISD::UDIV;
1921 SDValue Op0 = Node->getOperand(0);
1922 SDValue Op1 = Node->getOperand(1);
1923 for (SDNode::use_iterator UI = Op0.getNode()->use_begin(),
1924 UE = Op0.getNode()->use_end(); UI != UE; ++UI) {
1928 if (User->getOpcode() == OtherOpcode &&
1929 User->getOperand(0) == Op0 &&
1930 User->getOperand(1) == Op1)
1936 /// ExpandDivRemLibCall - Issue libcalls to __{u}divmod to compute div / rem
1939 SelectionDAGLegalize::ExpandDivRemLibCall(SDNode *Node,
1940 SmallVectorImpl<SDValue> &Results) {
1941 unsigned Opcode = Node->getOpcode();
1942 bool isSigned = Opcode == ISD::SDIVREM;
1945 switch (Node->getValueType(0).getSimpleVT().SimpleTy) {
1946 default: assert(0 && "Unexpected request for libcall!");
1947 case MVT::i8: LC= isSigned ? RTLIB::SDIVREM_I8 : RTLIB::UDIVREM_I8; break;
1948 case MVT::i16: LC= isSigned ? RTLIB::SDIVREM_I16 : RTLIB::UDIVREM_I16; break;
1949 case MVT::i32: LC= isSigned ? RTLIB::SDIVREM_I32 : RTLIB::UDIVREM_I32; break;
1950 case MVT::i64: LC= isSigned ? RTLIB::SDIVREM_I64 : RTLIB::UDIVREM_I64; break;
1951 case MVT::i128: LC= isSigned ? RTLIB::SDIVREM_I128:RTLIB::UDIVREM_I128; break;
1954 // The input chain to this libcall is the entry node of the function.
1955 // Legalizing the call will automatically add the previous call to the
1957 SDValue InChain = DAG.getEntryNode();
1959 EVT RetVT = Node->getValueType(0);
1960 Type *RetTy = RetVT.getTypeForEVT(*DAG.getContext());
1962 TargetLowering::ArgListTy Args;
1963 TargetLowering::ArgListEntry Entry;
1964 for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i) {
1965 EVT ArgVT = Node->getOperand(i).getValueType();
1966 Type *ArgTy = ArgVT.getTypeForEVT(*DAG.getContext());
1967 Entry.Node = Node->getOperand(i); Entry.Ty = ArgTy;
1968 Entry.isSExt = isSigned;
1969 Entry.isZExt = !isSigned;
1970 Args.push_back(Entry);
1973 // Also pass the return address of the remainder.
1974 SDValue FIPtr = DAG.CreateStackTemporary(RetVT);
1976 Entry.Ty = RetTy->getPointerTo();
1977 Entry.isSExt = isSigned;
1978 Entry.isZExt = !isSigned;
1979 Args.push_back(Entry);
1981 SDValue Callee = DAG.getExternalSymbol(TLI.getLibcallName(LC),
1982 TLI.getPointerTy());
1984 DebugLoc dl = Node->getDebugLoc();
1985 std::pair<SDValue, SDValue> CallInfo =
1986 TLI.LowerCallTo(InChain, RetTy, isSigned, !isSigned, false, false,
1987 0, TLI.getLibcallCallingConv(LC), /*isTailCall=*/false,
1988 /*isReturnValueUsed=*/true, Callee, Args, DAG, dl);
1990 // Remainder is loaded back from the stack frame.
1991 SDValue Rem = DAG.getLoad(RetVT, dl, CallInfo.second, FIPtr,
1992 MachinePointerInfo(), false, false, false, 0);
1993 Results.push_back(CallInfo.first);
1994 Results.push_back(Rem);
1997 /// ExpandLegalINT_TO_FP - This function is responsible for legalizing a
1998 /// INT_TO_FP operation of the specified operand when the target requests that
1999 /// we expand it. At this point, we know that the result and operand types are
2000 /// legal for the target.
2001 SDValue SelectionDAGLegalize::ExpandLegalINT_TO_FP(bool isSigned,
2005 if (Op0.getValueType() == MVT::i32) {
2006 // simple 32-bit [signed|unsigned] integer to float/double expansion
2008 // Get the stack frame index of a 8 byte buffer.
2009 SDValue StackSlot = DAG.CreateStackTemporary(MVT::f64);
2011 // word offset constant for Hi/Lo address computation
2012 SDValue WordOff = DAG.getConstant(sizeof(int), TLI.getPointerTy());
2013 // set up Hi and Lo (into buffer) address based on endian
2014 SDValue Hi = StackSlot;
2015 SDValue Lo = DAG.getNode(ISD::ADD, dl,
2016 TLI.getPointerTy(), StackSlot, WordOff);
2017 if (TLI.isLittleEndian())
2020 // if signed map to unsigned space
2023 // constant used to invert sign bit (signed to unsigned mapping)
2024 SDValue SignBit = DAG.getConstant(0x80000000u, MVT::i32);
2025 Op0Mapped = DAG.getNode(ISD::XOR, dl, MVT::i32, Op0, SignBit);
2029 // store the lo of the constructed double - based on integer input
2030 SDValue Store1 = DAG.getStore(DAG.getEntryNode(), dl,
2031 Op0Mapped, Lo, MachinePointerInfo(),
2033 // initial hi portion of constructed double
2034 SDValue InitialHi = DAG.getConstant(0x43300000u, MVT::i32);
2035 // store the hi of the constructed double - biased exponent
2036 SDValue Store2 = DAG.getStore(Store1, dl, InitialHi, Hi,
2037 MachinePointerInfo(),
2039 // load the constructed double
2040 SDValue Load = DAG.getLoad(MVT::f64, dl, Store2, StackSlot,
2041 MachinePointerInfo(), false, false, false, 0);
2042 // FP constant to bias correct the final result
2043 SDValue Bias = DAG.getConstantFP(isSigned ?
2044 BitsToDouble(0x4330000080000000ULL) :
2045 BitsToDouble(0x4330000000000000ULL),
2047 // subtract the bias
2048 SDValue Sub = DAG.getNode(ISD::FSUB, dl, MVT::f64, Load, Bias);
2051 // handle final rounding
2052 if (DestVT == MVT::f64) {
2055 } else if (DestVT.bitsLT(MVT::f64)) {
2056 Result = DAG.getNode(ISD::FP_ROUND, dl, DestVT, Sub,
2057 DAG.getIntPtrConstant(0));
2058 } else if (DestVT.bitsGT(MVT::f64)) {
2059 Result = DAG.getNode(ISD::FP_EXTEND, dl, DestVT, Sub);
2063 assert(!isSigned && "Legalize cannot Expand SINT_TO_FP for i64 yet");
2064 // Code below here assumes !isSigned without checking again.
2066 // Implementation of unsigned i64 to f64 following the algorithm in
2067 // __floatundidf in compiler_rt. This implementation has the advantage
2068 // of performing rounding correctly, both in the default rounding mode
2069 // and in all alternate rounding modes.
2070 // TODO: Generalize this for use with other types.
2071 if (Op0.getValueType() == MVT::i64 && DestVT == MVT::f64) {
2073 DAG.getConstant(UINT64_C(0x4330000000000000), MVT::i64);
2074 SDValue TwoP84PlusTwoP52 =
2075 DAG.getConstantFP(BitsToDouble(UINT64_C(0x4530000000100000)), MVT::f64);
2077 DAG.getConstant(UINT64_C(0x4530000000000000), MVT::i64);
2079 SDValue Lo = DAG.getZeroExtendInReg(Op0, dl, MVT::i32);
2080 SDValue Hi = DAG.getNode(ISD::SRL, dl, MVT::i64, Op0,
2081 DAG.getConstant(32, MVT::i64));
2082 SDValue LoOr = DAG.getNode(ISD::OR, dl, MVT::i64, Lo, TwoP52);
2083 SDValue HiOr = DAG.getNode(ISD::OR, dl, MVT::i64, Hi, TwoP84);
2084 SDValue LoFlt = DAG.getNode(ISD::BITCAST, dl, MVT::f64, LoOr);
2085 SDValue HiFlt = DAG.getNode(ISD::BITCAST, dl, MVT::f64, HiOr);
2086 SDValue HiSub = DAG.getNode(ISD::FSUB, dl, MVT::f64, HiFlt,
2088 return DAG.getNode(ISD::FADD, dl, MVT::f64, LoFlt, HiSub);
2091 // Implementation of unsigned i64 to f32.
2092 // TODO: Generalize this for use with other types.
2093 if (Op0.getValueType() == MVT::i64 && DestVT == MVT::f32) {
2094 // For unsigned conversions, convert them to signed conversions using the
2095 // algorithm from the x86_64 __floatundidf in compiler_rt.
2097 SDValue Fast = DAG.getNode(ISD::SINT_TO_FP, dl, MVT::f32, Op0);
2099 SDValue ShiftConst =
2100 DAG.getConstant(1, TLI.getShiftAmountTy(Op0.getValueType()));
2101 SDValue Shr = DAG.getNode(ISD::SRL, dl, MVT::i64, Op0, ShiftConst);
2102 SDValue AndConst = DAG.getConstant(1, MVT::i64);
2103 SDValue And = DAG.getNode(ISD::AND, dl, MVT::i64, Op0, AndConst);
2104 SDValue Or = DAG.getNode(ISD::OR, dl, MVT::i64, And, Shr);
2106 SDValue SignCvt = DAG.getNode(ISD::SINT_TO_FP, dl, MVT::f32, Or);
2107 SDValue Slow = DAG.getNode(ISD::FADD, dl, MVT::f32, SignCvt, SignCvt);
2109 // TODO: This really should be implemented using a branch rather than a
2110 // select. We happen to get lucky and machinesink does the right
2111 // thing most of the time. This would be a good candidate for a
2112 //pseudo-op, or, even better, for whole-function isel.
2113 SDValue SignBitTest = DAG.getSetCC(dl, TLI.getSetCCResultType(MVT::i64),
2114 Op0, DAG.getConstant(0, MVT::i64), ISD::SETLT);
2115 return DAG.getNode(ISD::SELECT, dl, MVT::f32, SignBitTest, Slow, Fast);
2118 // Otherwise, implement the fully general conversion.
2120 SDValue And = DAG.getNode(ISD::AND, dl, MVT::i64, Op0,
2121 DAG.getConstant(UINT64_C(0xfffffffffffff800), MVT::i64));
2122 SDValue Or = DAG.getNode(ISD::OR, dl, MVT::i64, And,
2123 DAG.getConstant(UINT64_C(0x800), MVT::i64));
2124 SDValue And2 = DAG.getNode(ISD::AND, dl, MVT::i64, Op0,
2125 DAG.getConstant(UINT64_C(0x7ff), MVT::i64));
2126 SDValue Ne = DAG.getSetCC(dl, TLI.getSetCCResultType(MVT::i64),
2127 And2, DAG.getConstant(UINT64_C(0), MVT::i64), ISD::SETNE);
2128 SDValue Sel = DAG.getNode(ISD::SELECT, dl, MVT::i64, Ne, Or, Op0);
2129 SDValue Ge = DAG.getSetCC(dl, TLI.getSetCCResultType(MVT::i64),
2130 Op0, DAG.getConstant(UINT64_C(0x0020000000000000), MVT::i64),
2132 SDValue Sel2 = DAG.getNode(ISD::SELECT, dl, MVT::i64, Ge, Sel, Op0);
2133 EVT SHVT = TLI.getShiftAmountTy(Sel2.getValueType());
2135 SDValue Sh = DAG.getNode(ISD::SRL, dl, MVT::i64, Sel2,
2136 DAG.getConstant(32, SHVT));
2137 SDValue Trunc = DAG.getNode(ISD::TRUNCATE, dl, MVT::i32, Sh);
2138 SDValue Fcvt = DAG.getNode(ISD::UINT_TO_FP, dl, MVT::f64, Trunc);
2140 DAG.getConstantFP(BitsToDouble(UINT64_C(0x41f0000000000000)), MVT::f64);
2141 SDValue Fmul = DAG.getNode(ISD::FMUL, dl, MVT::f64, TwoP32, Fcvt);
2142 SDValue Lo = DAG.getNode(ISD::TRUNCATE, dl, MVT::i32, Sel2);
2143 SDValue Fcvt2 = DAG.getNode(ISD::UINT_TO_FP, dl, MVT::f64, Lo);
2144 SDValue Fadd = DAG.getNode(ISD::FADD, dl, MVT::f64, Fmul, Fcvt2);
2145 return DAG.getNode(ISD::FP_ROUND, dl, MVT::f32, Fadd,
2146 DAG.getIntPtrConstant(0));
2149 SDValue Tmp1 = DAG.getNode(ISD::SINT_TO_FP, dl, DestVT, Op0);
2151 SDValue SignSet = DAG.getSetCC(dl, TLI.getSetCCResultType(Op0.getValueType()),
2152 Op0, DAG.getConstant(0, Op0.getValueType()),
2154 SDValue Zero = DAG.getIntPtrConstant(0), Four = DAG.getIntPtrConstant(4);
2155 SDValue CstOffset = DAG.getNode(ISD::SELECT, dl, Zero.getValueType(),
2156 SignSet, Four, Zero);
2158 // If the sign bit of the integer is set, the large number will be treated
2159 // as a negative number. To counteract this, the dynamic code adds an
2160 // offset depending on the data type.
2162 switch (Op0.getValueType().getSimpleVT().SimpleTy) {
2163 default: assert(0 && "Unsupported integer type!");
2164 case MVT::i8 : FF = 0x43800000ULL; break; // 2^8 (as a float)
2165 case MVT::i16: FF = 0x47800000ULL; break; // 2^16 (as a float)
2166 case MVT::i32: FF = 0x4F800000ULL; break; // 2^32 (as a float)
2167 case MVT::i64: FF = 0x5F800000ULL; break; // 2^64 (as a float)
2169 if (TLI.isLittleEndian()) FF <<= 32;
2170 Constant *FudgeFactor = ConstantInt::get(
2171 Type::getInt64Ty(*DAG.getContext()), FF);
2173 SDValue CPIdx = DAG.getConstantPool(FudgeFactor, TLI.getPointerTy());
2174 unsigned Alignment = cast<ConstantPoolSDNode>(CPIdx)->getAlignment();
2175 CPIdx = DAG.getNode(ISD::ADD, dl, TLI.getPointerTy(), CPIdx, CstOffset);
2176 Alignment = std::min(Alignment, 4u);
2178 if (DestVT == MVT::f32)
2179 FudgeInReg = DAG.getLoad(MVT::f32, dl, DAG.getEntryNode(), CPIdx,
2180 MachinePointerInfo::getConstantPool(),
2181 false, false, false, Alignment);
2183 SDValue Load = DAG.getExtLoad(ISD::EXTLOAD, dl, DestVT,
2184 DAG.getEntryNode(), CPIdx,
2185 MachinePointerInfo::getConstantPool(),
2186 MVT::f32, false, false, Alignment);
2187 HandleSDNode Handle(Load);
2188 LegalizeOp(Load.getNode());
2189 FudgeInReg = Handle.getValue();
2192 return DAG.getNode(ISD::FADD, dl, DestVT, Tmp1, FudgeInReg);
2195 /// PromoteLegalINT_TO_FP - This function is responsible for legalizing a
2196 /// *INT_TO_FP operation of the specified operand when the target requests that
2197 /// we promote it. At this point, we know that the result and operand types are
2198 /// legal for the target, and that there is a legal UINT_TO_FP or SINT_TO_FP
2199 /// operation that takes a larger input.
2200 SDValue SelectionDAGLegalize::PromoteLegalINT_TO_FP(SDValue LegalOp,
2204 // First step, figure out the appropriate *INT_TO_FP operation to use.
2205 EVT NewInTy = LegalOp.getValueType();
2207 unsigned OpToUse = 0;
2209 // Scan for the appropriate larger type to use.
2211 NewInTy = (MVT::SimpleValueType)(NewInTy.getSimpleVT().SimpleTy+1);
2212 assert(NewInTy.isInteger() && "Ran out of possibilities!");
2214 // If the target supports SINT_TO_FP of this type, use it.
2215 if (TLI.isOperationLegalOrCustom(ISD::SINT_TO_FP, NewInTy)) {
2216 OpToUse = ISD::SINT_TO_FP;
2219 if (isSigned) continue;
2221 // If the target supports UINT_TO_FP of this type, use it.
2222 if (TLI.isOperationLegalOrCustom(ISD::UINT_TO_FP, NewInTy)) {
2223 OpToUse = ISD::UINT_TO_FP;
2227 // Otherwise, try a larger type.
2230 // Okay, we found the operation and type to use. Zero extend our input to the
2231 // desired type then run the operation on it.
2232 return DAG.getNode(OpToUse, dl, DestVT,
2233 DAG.getNode(isSigned ? ISD::SIGN_EXTEND : ISD::ZERO_EXTEND,
2234 dl, NewInTy, LegalOp));
2237 /// PromoteLegalFP_TO_INT - This function is responsible for legalizing a
2238 /// FP_TO_*INT operation of the specified operand when the target requests that
2239 /// we promote it. At this point, we know that the result and operand types are
2240 /// legal for the target, and that there is a legal FP_TO_UINT or FP_TO_SINT
2241 /// operation that returns a larger result.
2242 SDValue SelectionDAGLegalize::PromoteLegalFP_TO_INT(SDValue LegalOp,
2246 // First step, figure out the appropriate FP_TO*INT operation to use.
2247 EVT NewOutTy = DestVT;
2249 unsigned OpToUse = 0;
2251 // Scan for the appropriate larger type to use.
2253 NewOutTy = (MVT::SimpleValueType)(NewOutTy.getSimpleVT().SimpleTy+1);
2254 assert(NewOutTy.isInteger() && "Ran out of possibilities!");
2256 if (TLI.isOperationLegalOrCustom(ISD::FP_TO_SINT, NewOutTy)) {
2257 OpToUse = ISD::FP_TO_SINT;
2261 if (TLI.isOperationLegalOrCustom(ISD::FP_TO_UINT, NewOutTy)) {
2262 OpToUse = ISD::FP_TO_UINT;
2266 // Otherwise, try a larger type.
2270 // Okay, we found the operation and type to use.
2271 SDValue Operation = DAG.getNode(OpToUse, dl, NewOutTy, LegalOp);
2273 // Truncate the result of the extended FP_TO_*INT operation to the desired
2275 return DAG.getNode(ISD::TRUNCATE, dl, DestVT, Operation);
2278 /// ExpandBSWAP - Open code the operations for BSWAP of the specified operation.
2280 SDValue SelectionDAGLegalize::ExpandBSWAP(SDValue Op, DebugLoc dl) {
2281 EVT VT = Op.getValueType();
2282 EVT SHVT = TLI.getShiftAmountTy(VT);
2283 SDValue Tmp1, Tmp2, Tmp3, Tmp4, Tmp5, Tmp6, Tmp7, Tmp8;
2284 switch (VT.getSimpleVT().SimpleTy) {
2285 default: assert(0 && "Unhandled Expand type in BSWAP!");
2287 Tmp2 = DAG.getNode(ISD::SHL, dl, VT, Op, DAG.getConstant(8, SHVT));
2288 Tmp1 = DAG.getNode(ISD::SRL, dl, VT, Op, DAG.getConstant(8, SHVT));
2289 return DAG.getNode(ISD::OR, dl, VT, Tmp1, Tmp2);
2291 Tmp4 = DAG.getNode(ISD::SHL, dl, VT, Op, DAG.getConstant(24, SHVT));
2292 Tmp3 = DAG.getNode(ISD::SHL, dl, VT, Op, DAG.getConstant(8, SHVT));
2293 Tmp2 = DAG.getNode(ISD::SRL, dl, VT, Op, DAG.getConstant(8, SHVT));
2294 Tmp1 = DAG.getNode(ISD::SRL, dl, VT, Op, DAG.getConstant(24, SHVT));
2295 Tmp3 = DAG.getNode(ISD::AND, dl, VT, Tmp3, DAG.getConstant(0xFF0000, VT));
2296 Tmp2 = DAG.getNode(ISD::AND, dl, VT, Tmp2, DAG.getConstant(0xFF00, VT));
2297 Tmp4 = DAG.getNode(ISD::OR, dl, VT, Tmp4, Tmp3);
2298 Tmp2 = DAG.getNode(ISD::OR, dl, VT, Tmp2, Tmp1);
2299 return DAG.getNode(ISD::OR, dl, VT, Tmp4, Tmp2);
2301 Tmp8 = DAG.getNode(ISD::SHL, dl, VT, Op, DAG.getConstant(56, SHVT));
2302 Tmp7 = DAG.getNode(ISD::SHL, dl, VT, Op, DAG.getConstant(40, SHVT));
2303 Tmp6 = DAG.getNode(ISD::SHL, dl, VT, Op, DAG.getConstant(24, SHVT));
2304 Tmp5 = DAG.getNode(ISD::SHL, dl, VT, Op, DAG.getConstant(8, SHVT));
2305 Tmp4 = DAG.getNode(ISD::SRL, dl, VT, Op, DAG.getConstant(8, SHVT));
2306 Tmp3 = DAG.getNode(ISD::SRL, dl, VT, Op, DAG.getConstant(24, SHVT));
2307 Tmp2 = DAG.getNode(ISD::SRL, dl, VT, Op, DAG.getConstant(40, SHVT));
2308 Tmp1 = DAG.getNode(ISD::SRL, dl, VT, Op, DAG.getConstant(56, SHVT));
2309 Tmp7 = DAG.getNode(ISD::AND, dl, VT, Tmp7, DAG.getConstant(255ULL<<48, VT));
2310 Tmp6 = DAG.getNode(ISD::AND, dl, VT, Tmp6, DAG.getConstant(255ULL<<40, VT));
2311 Tmp5 = DAG.getNode(ISD::AND, dl, VT, Tmp5, DAG.getConstant(255ULL<<32, VT));
2312 Tmp4 = DAG.getNode(ISD::AND, dl, VT, Tmp4, DAG.getConstant(255ULL<<24, VT));
2313 Tmp3 = DAG.getNode(ISD::AND, dl, VT, Tmp3, DAG.getConstant(255ULL<<16, VT));
2314 Tmp2 = DAG.getNode(ISD::AND, dl, VT, Tmp2, DAG.getConstant(255ULL<<8 , VT));
2315 Tmp8 = DAG.getNode(ISD::OR, dl, VT, Tmp8, Tmp7);
2316 Tmp6 = DAG.getNode(ISD::OR, dl, VT, Tmp6, Tmp5);
2317 Tmp4 = DAG.getNode(ISD::OR, dl, VT, Tmp4, Tmp3);
2318 Tmp2 = DAG.getNode(ISD::OR, dl, VT, Tmp2, Tmp1);
2319 Tmp8 = DAG.getNode(ISD::OR, dl, VT, Tmp8, Tmp6);
2320 Tmp4 = DAG.getNode(ISD::OR, dl, VT, Tmp4, Tmp2);
2321 return DAG.getNode(ISD::OR, dl, VT, Tmp8, Tmp4);
2325 /// SplatByte - Distribute ByteVal over NumBits bits.
2326 // FIXME: Move this helper to a common place.
2327 static APInt SplatByte(unsigned NumBits, uint8_t ByteVal) {
2328 APInt Val = APInt(NumBits, ByteVal);
2330 for (unsigned i = NumBits; i > 8; i >>= 1) {
2331 Val = (Val << Shift) | Val;
2337 /// ExpandBitCount - Expand the specified bitcount instruction into operations.
2339 SDValue SelectionDAGLegalize::ExpandBitCount(unsigned Opc, SDValue Op,
2342 default: assert(0 && "Cannot expand this yet!");
2344 EVT VT = Op.getValueType();
2345 EVT ShVT = TLI.getShiftAmountTy(VT);
2346 unsigned Len = VT.getSizeInBits();
2348 assert(VT.isInteger() && Len <= 128 && Len % 8 == 0 &&
2349 "CTPOP not implemented for this type.");
2351 // This is the "best" algorithm from
2352 // http://graphics.stanford.edu/~seander/bithacks.html#CountBitsSetParallel
2354 SDValue Mask55 = DAG.getConstant(SplatByte(Len, 0x55), VT);
2355 SDValue Mask33 = DAG.getConstant(SplatByte(Len, 0x33), VT);
2356 SDValue Mask0F = DAG.getConstant(SplatByte(Len, 0x0F), VT);
2357 SDValue Mask01 = DAG.getConstant(SplatByte(Len, 0x01), VT);
2359 // v = v - ((v >> 1) & 0x55555555...)
2360 Op = DAG.getNode(ISD::SUB, dl, VT, Op,
2361 DAG.getNode(ISD::AND, dl, VT,
2362 DAG.getNode(ISD::SRL, dl, VT, Op,
2363 DAG.getConstant(1, ShVT)),
2365 // v = (v & 0x33333333...) + ((v >> 2) & 0x33333333...)
2366 Op = DAG.getNode(ISD::ADD, dl, VT,
2367 DAG.getNode(ISD::AND, dl, VT, Op, Mask33),
2368 DAG.getNode(ISD::AND, dl, VT,
2369 DAG.getNode(ISD::SRL, dl, VT, Op,
2370 DAG.getConstant(2, ShVT)),
2372 // v = (v + (v >> 4)) & 0x0F0F0F0F...
2373 Op = DAG.getNode(ISD::AND, dl, VT,
2374 DAG.getNode(ISD::ADD, dl, VT, Op,
2375 DAG.getNode(ISD::SRL, dl, VT, Op,
2376 DAG.getConstant(4, ShVT))),
2378 // v = (v * 0x01010101...) >> (Len - 8)
2379 Op = DAG.getNode(ISD::SRL, dl, VT,
2380 DAG.getNode(ISD::MUL, dl, VT, Op, Mask01),
2381 DAG.getConstant(Len - 8, ShVT));
2385 case ISD::CTLZ_ZERO_UNDEF:
2386 // This trivially expands to CTLZ.
2387 return DAG.getNode(ISD::CTLZ, dl, Op.getValueType(), Op);
2389 // for now, we do this:
2390 // x = x | (x >> 1);
2391 // x = x | (x >> 2);
2393 // x = x | (x >>16);
2394 // x = x | (x >>32); // for 64-bit input
2395 // return popcount(~x);
2397 // but see also: http://www.hackersdelight.org/HDcode/nlz.cc
2398 EVT VT = Op.getValueType();
2399 EVT ShVT = TLI.getShiftAmountTy(VT);
2400 unsigned len = VT.getSizeInBits();
2401 for (unsigned i = 0; (1U << i) <= (len / 2); ++i) {
2402 SDValue Tmp3 = DAG.getConstant(1ULL << i, ShVT);
2403 Op = DAG.getNode(ISD::OR, dl, VT, Op,
2404 DAG.getNode(ISD::SRL, dl, VT, Op, Tmp3));
2406 Op = DAG.getNOT(dl, Op, VT);
2407 return DAG.getNode(ISD::CTPOP, dl, VT, Op);
2409 case ISD::CTTZ_ZERO_UNDEF:
2410 // This trivially expands to CTTZ.
2411 return DAG.getNode(ISD::CTTZ, dl, Op.getValueType(), Op);
2413 // for now, we use: { return popcount(~x & (x - 1)); }
2414 // unless the target has ctlz but not ctpop, in which case we use:
2415 // { return 32 - nlz(~x & (x-1)); }
2416 // see also http://www.hackersdelight.org/HDcode/ntz.cc
2417 EVT VT = Op.getValueType();
2418 SDValue Tmp3 = DAG.getNode(ISD::AND, dl, VT,
2419 DAG.getNOT(dl, Op, VT),
2420 DAG.getNode(ISD::SUB, dl, VT, Op,
2421 DAG.getConstant(1, VT)));
2422 // If ISD::CTLZ is legal and CTPOP isn't, then do that instead.
2423 if (!TLI.isOperationLegalOrCustom(ISD::CTPOP, VT) &&
2424 TLI.isOperationLegalOrCustom(ISD::CTLZ, VT))
2425 return DAG.getNode(ISD::SUB, dl, VT,
2426 DAG.getConstant(VT.getSizeInBits(), VT),
2427 DAG.getNode(ISD::CTLZ, dl, VT, Tmp3));
2428 return DAG.getNode(ISD::CTPOP, dl, VT, Tmp3);
2433 std::pair <SDValue, SDValue> SelectionDAGLegalize::ExpandAtomic(SDNode *Node) {
2434 unsigned Opc = Node->getOpcode();
2435 MVT VT = cast<AtomicSDNode>(Node)->getMemoryVT().getSimpleVT();
2440 llvm_unreachable("Unhandled atomic intrinsic Expand!");
2441 case ISD::ATOMIC_SWAP:
2442 switch (VT.SimpleTy) {
2443 default: llvm_unreachable("Unexpected value type for atomic!");
2444 case MVT::i8: LC = RTLIB::SYNC_LOCK_TEST_AND_SET_1; break;
2445 case MVT::i16: LC = RTLIB::SYNC_LOCK_TEST_AND_SET_2; break;
2446 case MVT::i32: LC = RTLIB::SYNC_LOCK_TEST_AND_SET_4; break;
2447 case MVT::i64: LC = RTLIB::SYNC_LOCK_TEST_AND_SET_8; break;
2450 case ISD::ATOMIC_CMP_SWAP:
2451 switch (VT.SimpleTy) {
2452 default: llvm_unreachable("Unexpected value type for atomic!");
2453 case MVT::i8: LC = RTLIB::SYNC_VAL_COMPARE_AND_SWAP_1; break;
2454 case MVT::i16: LC = RTLIB::SYNC_VAL_COMPARE_AND_SWAP_2; break;
2455 case MVT::i32: LC = RTLIB::SYNC_VAL_COMPARE_AND_SWAP_4; break;
2456 case MVT::i64: LC = RTLIB::SYNC_VAL_COMPARE_AND_SWAP_8; break;
2459 case ISD::ATOMIC_LOAD_ADD:
2460 switch (VT.SimpleTy) {
2461 default: llvm_unreachable("Unexpected value type for atomic!");
2462 case MVT::i8: LC = RTLIB::SYNC_FETCH_AND_ADD_1; break;
2463 case MVT::i16: LC = RTLIB::SYNC_FETCH_AND_ADD_2; break;
2464 case MVT::i32: LC = RTLIB::SYNC_FETCH_AND_ADD_4; break;
2465 case MVT::i64: LC = RTLIB::SYNC_FETCH_AND_ADD_8; break;
2468 case ISD::ATOMIC_LOAD_SUB:
2469 switch (VT.SimpleTy) {
2470 default: llvm_unreachable("Unexpected value type for atomic!");
2471 case MVT::i8: LC = RTLIB::SYNC_FETCH_AND_SUB_1; break;
2472 case MVT::i16: LC = RTLIB::SYNC_FETCH_AND_SUB_2; break;
2473 case MVT::i32: LC = RTLIB::SYNC_FETCH_AND_SUB_4; break;
2474 case MVT::i64: LC = RTLIB::SYNC_FETCH_AND_SUB_8; break;
2477 case ISD::ATOMIC_LOAD_AND:
2478 switch (VT.SimpleTy) {
2479 default: llvm_unreachable("Unexpected value type for atomic!");
2480 case MVT::i8: LC = RTLIB::SYNC_FETCH_AND_AND_1; break;
2481 case MVT::i16: LC = RTLIB::SYNC_FETCH_AND_AND_2; break;
2482 case MVT::i32: LC = RTLIB::SYNC_FETCH_AND_AND_4; break;
2483 case MVT::i64: LC = RTLIB::SYNC_FETCH_AND_AND_8; break;
2486 case ISD::ATOMIC_LOAD_OR:
2487 switch (VT.SimpleTy) {
2488 default: llvm_unreachable("Unexpected value type for atomic!");
2489 case MVT::i8: LC = RTLIB::SYNC_FETCH_AND_OR_1; break;
2490 case MVT::i16: LC = RTLIB::SYNC_FETCH_AND_OR_2; break;
2491 case MVT::i32: LC = RTLIB::SYNC_FETCH_AND_OR_4; break;
2492 case MVT::i64: LC = RTLIB::SYNC_FETCH_AND_OR_8; break;
2495 case ISD::ATOMIC_LOAD_XOR:
2496 switch (VT.SimpleTy) {
2497 default: llvm_unreachable("Unexpected value type for atomic!");
2498 case MVT::i8: LC = RTLIB::SYNC_FETCH_AND_XOR_1; break;
2499 case MVT::i16: LC = RTLIB::SYNC_FETCH_AND_XOR_2; break;
2500 case MVT::i32: LC = RTLIB::SYNC_FETCH_AND_XOR_4; break;
2501 case MVT::i64: LC = RTLIB::SYNC_FETCH_AND_XOR_8; break;
2504 case ISD::ATOMIC_LOAD_NAND:
2505 switch (VT.SimpleTy) {
2506 default: llvm_unreachable("Unexpected value type for atomic!");
2507 case MVT::i8: LC = RTLIB::SYNC_FETCH_AND_NAND_1; break;
2508 case MVT::i16: LC = RTLIB::SYNC_FETCH_AND_NAND_2; break;
2509 case MVT::i32: LC = RTLIB::SYNC_FETCH_AND_NAND_4; break;
2510 case MVT::i64: LC = RTLIB::SYNC_FETCH_AND_NAND_8; break;
2515 return ExpandChainLibCall(LC, Node, false);
2518 void SelectionDAGLegalize::ExpandNode(SDNode *Node) {
2519 SmallVector<SDValue, 8> Results;
2520 DebugLoc dl = Node->getDebugLoc();
2521 SDValue Tmp1, Tmp2, Tmp3, Tmp4;
2522 switch (Node->getOpcode()) {
2525 case ISD::CTLZ_ZERO_UNDEF:
2527 case ISD::CTTZ_ZERO_UNDEF:
2528 Tmp1 = ExpandBitCount(Node->getOpcode(), Node->getOperand(0), dl);
2529 Results.push_back(Tmp1);
2532 Results.push_back(ExpandBSWAP(Node->getOperand(0), dl));
2534 case ISD::FRAMEADDR:
2535 case ISD::RETURNADDR:
2536 case ISD::FRAME_TO_ARGS_OFFSET:
2537 Results.push_back(DAG.getConstant(0, Node->getValueType(0)));
2539 case ISD::FLT_ROUNDS_:
2540 Results.push_back(DAG.getConstant(1, Node->getValueType(0)));
2542 case ISD::EH_RETURN:
2546 case ISD::EH_SJLJ_LONGJMP:
2547 // If the target didn't expand these, there's nothing to do, so just
2548 // preserve the chain and be done.
2549 Results.push_back(Node->getOperand(0));
2551 case ISD::EH_SJLJ_SETJMP:
2552 // If the target didn't expand this, just return 'zero' and preserve the
2554 Results.push_back(DAG.getConstant(0, MVT::i32));
2555 Results.push_back(Node->getOperand(0));
2557 case ISD::ATOMIC_FENCE:
2558 case ISD::MEMBARRIER: {
2559 // If the target didn't lower this, lower it to '__sync_synchronize()' call
2560 // FIXME: handle "fence singlethread" more efficiently.
2561 TargetLowering::ArgListTy Args;
2562 std::pair<SDValue, SDValue> CallResult =
2563 TLI.LowerCallTo(Node->getOperand(0), Type::getVoidTy(*DAG.getContext()),
2564 false, false, false, false, 0, CallingConv::C,
2565 /*isTailCall=*/false,
2566 /*isReturnValueUsed=*/true,
2567 DAG.getExternalSymbol("__sync_synchronize",
2568 TLI.getPointerTy()),
2570 Results.push_back(CallResult.second);
2573 case ISD::ATOMIC_LOAD: {
2574 // There is no libcall for atomic load; fake it with ATOMIC_CMP_SWAP.
2575 SDValue Zero = DAG.getConstant(0, Node->getValueType(0));
2576 SDValue Swap = DAG.getAtomic(ISD::ATOMIC_CMP_SWAP, dl,
2577 cast<AtomicSDNode>(Node)->getMemoryVT(),
2578 Node->getOperand(0),
2579 Node->getOperand(1), Zero, Zero,
2580 cast<AtomicSDNode>(Node)->getMemOperand(),
2581 cast<AtomicSDNode>(Node)->getOrdering(),
2582 cast<AtomicSDNode>(Node)->getSynchScope());
2583 Results.push_back(Swap.getValue(0));
2584 Results.push_back(Swap.getValue(1));
2587 case ISD::ATOMIC_STORE: {
2588 // There is no libcall for atomic store; fake it with ATOMIC_SWAP.
2589 SDValue Swap = DAG.getAtomic(ISD::ATOMIC_SWAP, dl,
2590 cast<AtomicSDNode>(Node)->getMemoryVT(),
2591 Node->getOperand(0),
2592 Node->getOperand(1), Node->getOperand(2),
2593 cast<AtomicSDNode>(Node)->getMemOperand(),
2594 cast<AtomicSDNode>(Node)->getOrdering(),
2595 cast<AtomicSDNode>(Node)->getSynchScope());
2596 Results.push_back(Swap.getValue(1));
2599 // By default, atomic intrinsics are marked Legal and lowered. Targets
2600 // which don't support them directly, however, may want libcalls, in which
2601 // case they mark them Expand, and we get here.
2602 case ISD::ATOMIC_SWAP:
2603 case ISD::ATOMIC_LOAD_ADD:
2604 case ISD::ATOMIC_LOAD_SUB:
2605 case ISD::ATOMIC_LOAD_AND:
2606 case ISD::ATOMIC_LOAD_OR:
2607 case ISD::ATOMIC_LOAD_XOR:
2608 case ISD::ATOMIC_LOAD_NAND:
2609 case ISD::ATOMIC_LOAD_MIN:
2610 case ISD::ATOMIC_LOAD_MAX:
2611 case ISD::ATOMIC_LOAD_UMIN:
2612 case ISD::ATOMIC_LOAD_UMAX:
2613 case ISD::ATOMIC_CMP_SWAP: {
2614 std::pair<SDValue, SDValue> Tmp = ExpandAtomic(Node);
2615 Results.push_back(Tmp.first);
2616 Results.push_back(Tmp.second);
2619 case ISD::DYNAMIC_STACKALLOC:
2620 ExpandDYNAMIC_STACKALLOC(Node, Results);
2622 case ISD::MERGE_VALUES:
2623 for (unsigned i = 0; i < Node->getNumValues(); i++)
2624 Results.push_back(Node->getOperand(i));
2627 EVT VT = Node->getValueType(0);
2629 Results.push_back(DAG.getConstant(0, VT));
2631 assert(VT.isFloatingPoint() && "Unknown value type!");
2632 Results.push_back(DAG.getConstantFP(0, VT));
2637 // If this operation is not supported, lower it to 'abort()' call
2638 TargetLowering::ArgListTy Args;
2639 std::pair<SDValue, SDValue> CallResult =
2640 TLI.LowerCallTo(Node->getOperand(0), Type::getVoidTy(*DAG.getContext()),
2641 false, false, false, false, 0, CallingConv::C,
2642 /*isTailCall=*/false,
2643 /*isReturnValueUsed=*/true,
2644 DAG.getExternalSymbol("abort", TLI.getPointerTy()),
2646 Results.push_back(CallResult.second);
2651 Tmp1 = EmitStackConvert(Node->getOperand(0), Node->getValueType(0),
2652 Node->getValueType(0), dl);
2653 Results.push_back(Tmp1);
2655 case ISD::FP_EXTEND:
2656 Tmp1 = EmitStackConvert(Node->getOperand(0),
2657 Node->getOperand(0).getValueType(),
2658 Node->getValueType(0), dl);
2659 Results.push_back(Tmp1);
2661 case ISD::SIGN_EXTEND_INREG: {
2662 // NOTE: we could fall back on load/store here too for targets without
2663 // SAR. However, it is doubtful that any exist.
2664 EVT ExtraVT = cast<VTSDNode>(Node->getOperand(1))->getVT();
2665 EVT VT = Node->getValueType(0);
2666 EVT ShiftAmountTy = TLI.getShiftAmountTy(VT);
2669 unsigned BitsDiff = VT.getScalarType().getSizeInBits() -
2670 ExtraVT.getScalarType().getSizeInBits();
2671 SDValue ShiftCst = DAG.getConstant(BitsDiff, ShiftAmountTy);
2672 Tmp1 = DAG.getNode(ISD::SHL, dl, Node->getValueType(0),
2673 Node->getOperand(0), ShiftCst);
2674 Tmp1 = DAG.getNode(ISD::SRA, dl, Node->getValueType(0), Tmp1, ShiftCst);
2675 Results.push_back(Tmp1);
2678 case ISD::FP_ROUND_INREG: {
2679 // The only way we can lower this is to turn it into a TRUNCSTORE,
2680 // EXTLOAD pair, targeting a temporary location (a stack slot).
2682 // NOTE: there is a choice here between constantly creating new stack
2683 // slots and always reusing the same one. We currently always create
2684 // new ones, as reuse may inhibit scheduling.
2685 EVT ExtraVT = cast<VTSDNode>(Node->getOperand(1))->getVT();
2686 Tmp1 = EmitStackConvert(Node->getOperand(0), ExtraVT,
2687 Node->getValueType(0), dl);
2688 Results.push_back(Tmp1);
2691 case ISD::SINT_TO_FP:
2692 case ISD::UINT_TO_FP:
2693 Tmp1 = ExpandLegalINT_TO_FP(Node->getOpcode() == ISD::SINT_TO_FP,
2694 Node->getOperand(0), Node->getValueType(0), dl);
2695 Results.push_back(Tmp1);
2697 case ISD::FP_TO_UINT: {
2698 SDValue True, False;
2699 EVT VT = Node->getOperand(0).getValueType();
2700 EVT NVT = Node->getValueType(0);
2701 APFloat apf(APInt::getNullValue(VT.getSizeInBits()));
2702 APInt x = APInt::getSignBit(NVT.getSizeInBits());
2703 (void)apf.convertFromAPInt(x, false, APFloat::rmNearestTiesToEven);
2704 Tmp1 = DAG.getConstantFP(apf, VT);
2705 Tmp2 = DAG.getSetCC(dl, TLI.getSetCCResultType(VT),
2706 Node->getOperand(0),
2708 True = DAG.getNode(ISD::FP_TO_SINT, dl, NVT, Node->getOperand(0));
2709 False = DAG.getNode(ISD::FP_TO_SINT, dl, NVT,
2710 DAG.getNode(ISD::FSUB, dl, VT,
2711 Node->getOperand(0), Tmp1));
2712 False = DAG.getNode(ISD::XOR, dl, NVT, False,
2713 DAG.getConstant(x, NVT));
2714 Tmp1 = DAG.getNode(ISD::SELECT, dl, NVT, Tmp2, True, False);
2715 Results.push_back(Tmp1);
2719 const Value *V = cast<SrcValueSDNode>(Node->getOperand(2))->getValue();
2720 EVT VT = Node->getValueType(0);
2721 Tmp1 = Node->getOperand(0);
2722 Tmp2 = Node->getOperand(1);
2723 unsigned Align = Node->getConstantOperandVal(3);
2725 SDValue VAListLoad = DAG.getLoad(TLI.getPointerTy(), dl, Tmp1, Tmp2,
2726 MachinePointerInfo(V),
2727 false, false, false, 0);
2728 SDValue VAList = VAListLoad;
2730 if (Align > TLI.getMinStackArgumentAlignment()) {
2731 assert(((Align & (Align-1)) == 0) && "Expected Align to be a power of 2");
2733 VAList = DAG.getNode(ISD::ADD, dl, TLI.getPointerTy(), VAList,
2734 DAG.getConstant(Align - 1,
2735 TLI.getPointerTy()));
2737 VAList = DAG.getNode(ISD::AND, dl, TLI.getPointerTy(), VAList,
2738 DAG.getConstant(-(int64_t)Align,
2739 TLI.getPointerTy()));
2742 // Increment the pointer, VAList, to the next vaarg
2743 Tmp3 = DAG.getNode(ISD::ADD, dl, TLI.getPointerTy(), VAList,
2744 DAG.getConstant(TLI.getTargetData()->
2745 getTypeAllocSize(VT.getTypeForEVT(*DAG.getContext())),
2746 TLI.getPointerTy()));
2747 // Store the incremented VAList to the legalized pointer
2748 Tmp3 = DAG.getStore(VAListLoad.getValue(1), dl, Tmp3, Tmp2,
2749 MachinePointerInfo(V), false, false, 0);
2750 // Load the actual argument out of the pointer VAList
2751 Results.push_back(DAG.getLoad(VT, dl, Tmp3, VAList, MachinePointerInfo(),
2752 false, false, false, 0));
2753 Results.push_back(Results[0].getValue(1));
2757 // This defaults to loading a pointer from the input and storing it to the
2758 // output, returning the chain.
2759 const Value *VD = cast<SrcValueSDNode>(Node->getOperand(3))->getValue();
2760 const Value *VS = cast<SrcValueSDNode>(Node->getOperand(4))->getValue();
2761 Tmp1 = DAG.getLoad(TLI.getPointerTy(), dl, Node->getOperand(0),
2762 Node->getOperand(2), MachinePointerInfo(VS),
2763 false, false, false, 0);
2764 Tmp1 = DAG.getStore(Tmp1.getValue(1), dl, Tmp1, Node->getOperand(1),
2765 MachinePointerInfo(VD), false, false, 0);
2766 Results.push_back(Tmp1);
2769 case ISD::EXTRACT_VECTOR_ELT:
2770 if (Node->getOperand(0).getValueType().getVectorNumElements() == 1)
2771 // This must be an access of the only element. Return it.
2772 Tmp1 = DAG.getNode(ISD::BITCAST, dl, Node->getValueType(0),
2773 Node->getOperand(0));
2775 Tmp1 = ExpandExtractFromVectorThroughStack(SDValue(Node, 0));
2776 Results.push_back(Tmp1);
2778 case ISD::EXTRACT_SUBVECTOR:
2779 Results.push_back(ExpandExtractFromVectorThroughStack(SDValue(Node, 0)));
2781 case ISD::INSERT_SUBVECTOR:
2782 Results.push_back(ExpandInsertToVectorThroughStack(SDValue(Node, 0)));
2784 case ISD::CONCAT_VECTORS: {
2785 Results.push_back(ExpandVectorBuildThroughStack(Node));
2788 case ISD::SCALAR_TO_VECTOR:
2789 Results.push_back(ExpandSCALAR_TO_VECTOR(Node));
2791 case ISD::INSERT_VECTOR_ELT:
2792 Results.push_back(ExpandINSERT_VECTOR_ELT(Node->getOperand(0),
2793 Node->getOperand(1),
2794 Node->getOperand(2), dl));
2796 case ISD::VECTOR_SHUFFLE: {
2797 SmallVector<int, 32> NewMask;
2798 ArrayRef<int> Mask = cast<ShuffleVectorSDNode>(Node)->getMask();
2800 EVT VT = Node->getValueType(0);
2801 EVT EltVT = VT.getVectorElementType();
2802 SDValue Op0 = Node->getOperand(0);
2803 SDValue Op1 = Node->getOperand(1);
2804 if (!TLI.isTypeLegal(EltVT)) {
2806 EVT NewEltVT = TLI.getTypeToTransformTo(*DAG.getContext(), EltVT);
2808 // BUILD_VECTOR operands are allowed to be wider than the element type.
2809 // But if NewEltVT is smaller that EltVT the BUILD_VECTOR does not accept it
2810 if (NewEltVT.bitsLT(EltVT)) {
2812 // Convert shuffle node.
2813 // If original node was v4i64 and the new EltVT is i32,
2814 // cast operands to v8i32 and re-build the mask.
2816 // Calculate new VT, the size of the new VT should be equal to original.
2817 EVT NewVT = EVT::getVectorVT(*DAG.getContext(), NewEltVT,
2818 VT.getSizeInBits()/NewEltVT.getSizeInBits());
2819 assert(NewVT.bitsEq(VT));
2821 // cast operands to new VT
2822 Op0 = DAG.getNode(ISD::BITCAST, dl, NewVT, Op0);
2823 Op1 = DAG.getNode(ISD::BITCAST, dl, NewVT, Op1);
2825 // Convert the shuffle mask
2826 unsigned int factor = NewVT.getVectorNumElements()/VT.getVectorNumElements();
2828 // EltVT gets smaller
2831 for (unsigned i = 0; i < VT.getVectorNumElements(); ++i) {
2833 for (unsigned fi = 0; fi < factor; ++fi)
2834 NewMask.push_back(Mask[i]);
2837 for (unsigned fi = 0; fi < factor; ++fi)
2838 NewMask.push_back(Mask[i]*factor+fi);
2846 unsigned NumElems = VT.getVectorNumElements();
2847 SmallVector<SDValue, 16> Ops;
2848 for (unsigned i = 0; i != NumElems; ++i) {
2850 Ops.push_back(DAG.getUNDEF(EltVT));
2853 unsigned Idx = Mask[i];
2855 Ops.push_back(DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, EltVT,
2857 DAG.getIntPtrConstant(Idx)));
2859 Ops.push_back(DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, EltVT,
2861 DAG.getIntPtrConstant(Idx - NumElems)));
2864 Tmp1 = DAG.getNode(ISD::BUILD_VECTOR, dl, VT, &Ops[0], Ops.size());
2865 // We may have changed the BUILD_VECTOR type. Cast it back to the Node type.
2866 Tmp1 = DAG.getNode(ISD::BITCAST, dl, Node->getValueType(0), Tmp1);
2867 Results.push_back(Tmp1);
2870 case ISD::EXTRACT_ELEMENT: {
2871 EVT OpTy = Node->getOperand(0).getValueType();
2872 if (cast<ConstantSDNode>(Node->getOperand(1))->getZExtValue()) {
2874 Tmp1 = DAG.getNode(ISD::SRL, dl, OpTy, Node->getOperand(0),
2875 DAG.getConstant(OpTy.getSizeInBits()/2,
2876 TLI.getShiftAmountTy(Node->getOperand(0).getValueType())));
2877 Tmp1 = DAG.getNode(ISD::TRUNCATE, dl, Node->getValueType(0), Tmp1);
2880 Tmp1 = DAG.getNode(ISD::TRUNCATE, dl, Node->getValueType(0),
2881 Node->getOperand(0));
2883 Results.push_back(Tmp1);
2886 case ISD::STACKSAVE:
2887 // Expand to CopyFromReg if the target set
2888 // StackPointerRegisterToSaveRestore.
2889 if (unsigned SP = TLI.getStackPointerRegisterToSaveRestore()) {
2890 Results.push_back(DAG.getCopyFromReg(Node->getOperand(0), dl, SP,
2891 Node->getValueType(0)));
2892 Results.push_back(Results[0].getValue(1));
2894 Results.push_back(DAG.getUNDEF(Node->getValueType(0)));
2895 Results.push_back(Node->getOperand(0));
2898 case ISD::STACKRESTORE:
2899 // Expand to CopyToReg if the target set
2900 // StackPointerRegisterToSaveRestore.
2901 if (unsigned SP = TLI.getStackPointerRegisterToSaveRestore()) {
2902 Results.push_back(DAG.getCopyToReg(Node->getOperand(0), dl, SP,
2903 Node->getOperand(1)));
2905 Results.push_back(Node->getOperand(0));
2908 case ISD::FCOPYSIGN:
2909 Results.push_back(ExpandFCOPYSIGN(Node));
2912 // Expand Y = FNEG(X) -> Y = SUB -0.0, X
2913 Tmp1 = DAG.getConstantFP(-0.0, Node->getValueType(0));
2914 Tmp1 = DAG.getNode(ISD::FSUB, dl, Node->getValueType(0), Tmp1,
2915 Node->getOperand(0));
2916 Results.push_back(Tmp1);
2919 // Expand Y = FABS(X) -> Y = (X >u 0.0) ? X : fneg(X).
2920 EVT VT = Node->getValueType(0);
2921 Tmp1 = Node->getOperand(0);
2922 Tmp2 = DAG.getConstantFP(0.0, VT);
2923 Tmp2 = DAG.getSetCC(dl, TLI.getSetCCResultType(Tmp1.getValueType()),
2924 Tmp1, Tmp2, ISD::SETUGT);
2925 Tmp3 = DAG.getNode(ISD::FNEG, dl, VT, Tmp1);
2926 Tmp1 = DAG.getNode(ISD::SELECT, dl, VT, Tmp2, Tmp1, Tmp3);
2927 Results.push_back(Tmp1);
2931 Results.push_back(ExpandFPLibCall(Node, RTLIB::SQRT_F32, RTLIB::SQRT_F64,
2932 RTLIB::SQRT_F80, RTLIB::SQRT_PPCF128));
2935 Results.push_back(ExpandFPLibCall(Node, RTLIB::SIN_F32, RTLIB::SIN_F64,
2936 RTLIB::SIN_F80, RTLIB::SIN_PPCF128));
2939 Results.push_back(ExpandFPLibCall(Node, RTLIB::COS_F32, RTLIB::COS_F64,
2940 RTLIB::COS_F80, RTLIB::COS_PPCF128));
2943 Results.push_back(ExpandFPLibCall(Node, RTLIB::LOG_F32, RTLIB::LOG_F64,
2944 RTLIB::LOG_F80, RTLIB::LOG_PPCF128));
2947 Results.push_back(ExpandFPLibCall(Node, RTLIB::LOG2_F32, RTLIB::LOG2_F64,
2948 RTLIB::LOG2_F80, RTLIB::LOG2_PPCF128));
2951 Results.push_back(ExpandFPLibCall(Node, RTLIB::LOG10_F32, RTLIB::LOG10_F64,
2952 RTLIB::LOG10_F80, RTLIB::LOG10_PPCF128));
2955 Results.push_back(ExpandFPLibCall(Node, RTLIB::EXP_F32, RTLIB::EXP_F64,
2956 RTLIB::EXP_F80, RTLIB::EXP_PPCF128));
2959 Results.push_back(ExpandFPLibCall(Node, RTLIB::EXP2_F32, RTLIB::EXP2_F64,
2960 RTLIB::EXP2_F80, RTLIB::EXP2_PPCF128));
2963 Results.push_back(ExpandFPLibCall(Node, RTLIB::TRUNC_F32, RTLIB::TRUNC_F64,
2964 RTLIB::TRUNC_F80, RTLIB::TRUNC_PPCF128));
2967 Results.push_back(ExpandFPLibCall(Node, RTLIB::FLOOR_F32, RTLIB::FLOOR_F64,
2968 RTLIB::FLOOR_F80, RTLIB::FLOOR_PPCF128));
2971 Results.push_back(ExpandFPLibCall(Node, RTLIB::CEIL_F32, RTLIB::CEIL_F64,
2972 RTLIB::CEIL_F80, RTLIB::CEIL_PPCF128));
2975 Results.push_back(ExpandFPLibCall(Node, RTLIB::RINT_F32, RTLIB::RINT_F64,
2976 RTLIB::RINT_F80, RTLIB::RINT_PPCF128));
2978 case ISD::FNEARBYINT:
2979 Results.push_back(ExpandFPLibCall(Node, RTLIB::NEARBYINT_F32,
2980 RTLIB::NEARBYINT_F64,
2981 RTLIB::NEARBYINT_F80,
2982 RTLIB::NEARBYINT_PPCF128));
2985 Results.push_back(ExpandFPLibCall(Node, RTLIB::POWI_F32, RTLIB::POWI_F64,
2986 RTLIB::POWI_F80, RTLIB::POWI_PPCF128));
2989 Results.push_back(ExpandFPLibCall(Node, RTLIB::POW_F32, RTLIB::POW_F64,
2990 RTLIB::POW_F80, RTLIB::POW_PPCF128));
2993 Results.push_back(ExpandFPLibCall(Node, RTLIB::DIV_F32, RTLIB::DIV_F64,
2994 RTLIB::DIV_F80, RTLIB::DIV_PPCF128));
2997 Results.push_back(ExpandFPLibCall(Node, RTLIB::REM_F32, RTLIB::REM_F64,
2998 RTLIB::REM_F80, RTLIB::REM_PPCF128));
3001 Results.push_back(ExpandFPLibCall(Node, RTLIB::FMA_F32, RTLIB::FMA_F64,
3002 RTLIB::FMA_F80, RTLIB::FMA_PPCF128));
3004 case ISD::FP16_TO_FP32:
3005 Results.push_back(ExpandLibCall(RTLIB::FPEXT_F16_F32, Node, false));
3007 case ISD::FP32_TO_FP16:
3008 Results.push_back(ExpandLibCall(RTLIB::FPROUND_F32_F16, Node, false));
3010 case ISD::ConstantFP: {
3011 ConstantFPSDNode *CFP = cast<ConstantFPSDNode>(Node);
3012 // Check to see if this FP immediate is already legal.
3013 // If this is a legal constant, turn it into a TargetConstantFP node.
3014 if (!TLI.isFPImmLegal(CFP->getValueAPF(), Node->getValueType(0)))
3015 Results.push_back(ExpandConstantFP(CFP, true));
3018 case ISD::EHSELECTION: {
3019 unsigned Reg = TLI.getExceptionSelectorRegister();
3020 assert(Reg && "Can't expand to unknown register!");
3021 Results.push_back(DAG.getCopyFromReg(Node->getOperand(1), dl, Reg,
3022 Node->getValueType(0)));
3023 Results.push_back(Results[0].getValue(1));
3026 case ISD::EXCEPTIONADDR: {
3027 unsigned Reg = TLI.getExceptionAddressRegister();
3028 assert(Reg && "Can't expand to unknown register!");
3029 Results.push_back(DAG.getCopyFromReg(Node->getOperand(0), dl, Reg,
3030 Node->getValueType(0)));
3031 Results.push_back(Results[0].getValue(1));
3035 EVT VT = Node->getValueType(0);
3036 assert(TLI.isOperationLegalOrCustom(ISD::ADD, VT) &&
3037 TLI.isOperationLegalOrCustom(ISD::XOR, VT) &&
3038 "Don't know how to expand this subtraction!");
3039 Tmp1 = DAG.getNode(ISD::XOR, dl, VT, Node->getOperand(1),
3040 DAG.getConstant(APInt::getAllOnesValue(VT.getSizeInBits()), VT));
3041 Tmp1 = DAG.getNode(ISD::ADD, dl, VT, Tmp2, DAG.getConstant(1, VT));
3042 Results.push_back(DAG.getNode(ISD::ADD, dl, VT, Node->getOperand(0), Tmp1));
3047 EVT VT = Node->getValueType(0);
3048 SDVTList VTs = DAG.getVTList(VT, VT);
3049 bool isSigned = Node->getOpcode() == ISD::SREM;
3050 unsigned DivOpc = isSigned ? ISD::SDIV : ISD::UDIV;
3051 unsigned DivRemOpc = isSigned ? ISD::SDIVREM : ISD::UDIVREM;
3052 Tmp2 = Node->getOperand(0);
3053 Tmp3 = Node->getOperand(1);
3054 if (TLI.isOperationLegalOrCustom(DivRemOpc, VT) ||
3055 (isDivRemLibcallAvailable(Node, isSigned, TLI) &&
3056 UseDivRem(Node, isSigned, false))) {
3057 Tmp1 = DAG.getNode(DivRemOpc, dl, VTs, Tmp2, Tmp3).getValue(1);
3058 } else if (TLI.isOperationLegalOrCustom(DivOpc, VT)) {
3060 Tmp1 = DAG.getNode(DivOpc, dl, VT, Tmp2, Tmp3);
3061 Tmp1 = DAG.getNode(ISD::MUL, dl, VT, Tmp1, Tmp3);
3062 Tmp1 = DAG.getNode(ISD::SUB, dl, VT, Tmp2, Tmp1);
3063 } else if (isSigned)
3064 Tmp1 = ExpandIntLibCall(Node, true,
3066 RTLIB::SREM_I16, RTLIB::SREM_I32,
3067 RTLIB::SREM_I64, RTLIB::SREM_I128);
3069 Tmp1 = ExpandIntLibCall(Node, false,
3071 RTLIB::UREM_I16, RTLIB::UREM_I32,
3072 RTLIB::UREM_I64, RTLIB::UREM_I128);
3073 Results.push_back(Tmp1);
3078 bool isSigned = Node->getOpcode() == ISD::SDIV;
3079 unsigned DivRemOpc = isSigned ? ISD::SDIVREM : ISD::UDIVREM;
3080 EVT VT = Node->getValueType(0);
3081 SDVTList VTs = DAG.getVTList(VT, VT);
3082 if (TLI.isOperationLegalOrCustom(DivRemOpc, VT) ||
3083 (isDivRemLibcallAvailable(Node, isSigned, TLI) &&
3084 UseDivRem(Node, isSigned, true)))
3085 Tmp1 = DAG.getNode(DivRemOpc, dl, VTs, Node->getOperand(0),
3086 Node->getOperand(1));
3088 Tmp1 = ExpandIntLibCall(Node, true,
3090 RTLIB::SDIV_I16, RTLIB::SDIV_I32,
3091 RTLIB::SDIV_I64, RTLIB::SDIV_I128);
3093 Tmp1 = ExpandIntLibCall(Node, false,
3095 RTLIB::UDIV_I16, RTLIB::UDIV_I32,
3096 RTLIB::UDIV_I64, RTLIB::UDIV_I128);
3097 Results.push_back(Tmp1);
3102 unsigned ExpandOpcode = Node->getOpcode() == ISD::MULHU ? ISD::UMUL_LOHI :
3104 EVT VT = Node->getValueType(0);
3105 SDVTList VTs = DAG.getVTList(VT, VT);
3106 assert(TLI.isOperationLegalOrCustom(ExpandOpcode, VT) &&
3107 "If this wasn't legal, it shouldn't have been created!");
3108 Tmp1 = DAG.getNode(ExpandOpcode, dl, VTs, Node->getOperand(0),
3109 Node->getOperand(1));
3110 Results.push_back(Tmp1.getValue(1));
3115 // Expand into divrem libcall
3116 ExpandDivRemLibCall(Node, Results);
3119 EVT VT = Node->getValueType(0);
3120 SDVTList VTs = DAG.getVTList(VT, VT);
3121 // See if multiply or divide can be lowered using two-result operations.
3122 // We just need the low half of the multiply; try both the signed
3123 // and unsigned forms. If the target supports both SMUL_LOHI and
3124 // UMUL_LOHI, form a preference by checking which forms of plain
3125 // MULH it supports.
3126 bool HasSMUL_LOHI = TLI.isOperationLegalOrCustom(ISD::SMUL_LOHI, VT);
3127 bool HasUMUL_LOHI = TLI.isOperationLegalOrCustom(ISD::UMUL_LOHI, VT);
3128 bool HasMULHS = TLI.isOperationLegalOrCustom(ISD::MULHS, VT);
3129 bool HasMULHU = TLI.isOperationLegalOrCustom(ISD::MULHU, VT);
3130 unsigned OpToUse = 0;
3131 if (HasSMUL_LOHI && !HasMULHS) {
3132 OpToUse = ISD::SMUL_LOHI;
3133 } else if (HasUMUL_LOHI && !HasMULHU) {
3134 OpToUse = ISD::UMUL_LOHI;
3135 } else if (HasSMUL_LOHI) {
3136 OpToUse = ISD::SMUL_LOHI;
3137 } else if (HasUMUL_LOHI) {
3138 OpToUse = ISD::UMUL_LOHI;
3141 Results.push_back(DAG.getNode(OpToUse, dl, VTs, Node->getOperand(0),
3142 Node->getOperand(1)));
3145 Tmp1 = ExpandIntLibCall(Node, false,
3147 RTLIB::MUL_I16, RTLIB::MUL_I32,
3148 RTLIB::MUL_I64, RTLIB::MUL_I128);
3149 Results.push_back(Tmp1);
3154 SDValue LHS = Node->getOperand(0);
3155 SDValue RHS = Node->getOperand(1);
3156 SDValue Sum = DAG.getNode(Node->getOpcode() == ISD::SADDO ?
3157 ISD::ADD : ISD::SUB, dl, LHS.getValueType(),
3159 Results.push_back(Sum);
3160 EVT OType = Node->getValueType(1);
3162 SDValue Zero = DAG.getConstant(0, LHS.getValueType());
3164 // LHSSign -> LHS >= 0
3165 // RHSSign -> RHS >= 0
3166 // SumSign -> Sum >= 0
3169 // Overflow -> (LHSSign == RHSSign) && (LHSSign != SumSign)
3171 // Overflow -> (LHSSign != RHSSign) && (LHSSign != SumSign)
3173 SDValue LHSSign = DAG.getSetCC(dl, OType, LHS, Zero, ISD::SETGE);
3174 SDValue RHSSign = DAG.getSetCC(dl, OType, RHS, Zero, ISD::SETGE);
3175 SDValue SignsMatch = DAG.getSetCC(dl, OType, LHSSign, RHSSign,
3176 Node->getOpcode() == ISD::SADDO ?
3177 ISD::SETEQ : ISD::SETNE);
3179 SDValue SumSign = DAG.getSetCC(dl, OType, Sum, Zero, ISD::SETGE);
3180 SDValue SumSignNE = DAG.getSetCC(dl, OType, LHSSign, SumSign, ISD::SETNE);
3182 SDValue Cmp = DAG.getNode(ISD::AND, dl, OType, SignsMatch, SumSignNE);
3183 Results.push_back(Cmp);
3188 SDValue LHS = Node->getOperand(0);
3189 SDValue RHS = Node->getOperand(1);
3190 SDValue Sum = DAG.getNode(Node->getOpcode() == ISD::UADDO ?
3191 ISD::ADD : ISD::SUB, dl, LHS.getValueType(),
3193 Results.push_back(Sum);
3194 Results.push_back(DAG.getSetCC(dl, Node->getValueType(1), Sum, LHS,
3195 Node->getOpcode () == ISD::UADDO ?
3196 ISD::SETULT : ISD::SETUGT));
3201 EVT VT = Node->getValueType(0);
3202 EVT WideVT = EVT::getIntegerVT(*DAG.getContext(), VT.getSizeInBits() * 2);
3203 SDValue LHS = Node->getOperand(0);
3204 SDValue RHS = Node->getOperand(1);
3207 static const unsigned Ops[2][3] =
3208 { { ISD::MULHU, ISD::UMUL_LOHI, ISD::ZERO_EXTEND },
3209 { ISD::MULHS, ISD::SMUL_LOHI, ISD::SIGN_EXTEND }};
3210 bool isSigned = Node->getOpcode() == ISD::SMULO;
3211 if (TLI.isOperationLegalOrCustom(Ops[isSigned][0], VT)) {
3212 BottomHalf = DAG.getNode(ISD::MUL, dl, VT, LHS, RHS);
3213 TopHalf = DAG.getNode(Ops[isSigned][0], dl, VT, LHS, RHS);
3214 } else if (TLI.isOperationLegalOrCustom(Ops[isSigned][1], VT)) {
3215 BottomHalf = DAG.getNode(Ops[isSigned][1], dl, DAG.getVTList(VT, VT), LHS,
3217 TopHalf = BottomHalf.getValue(1);
3218 } else if (TLI.isTypeLegal(EVT::getIntegerVT(*DAG.getContext(),
3219 VT.getSizeInBits() * 2))) {
3220 LHS = DAG.getNode(Ops[isSigned][2], dl, WideVT, LHS);
3221 RHS = DAG.getNode(Ops[isSigned][2], dl, WideVT, RHS);
3222 Tmp1 = DAG.getNode(ISD::MUL, dl, WideVT, LHS, RHS);
3223 BottomHalf = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, VT, Tmp1,
3224 DAG.getIntPtrConstant(0));
3225 TopHalf = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, VT, Tmp1,
3226 DAG.getIntPtrConstant(1));
3228 // We can fall back to a libcall with an illegal type for the MUL if we
3229 // have a libcall big enough.
3230 // Also, we can fall back to a division in some cases, but that's a big
3231 // performance hit in the general case.
3232 RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
3233 if (WideVT == MVT::i16)
3234 LC = RTLIB::MUL_I16;
3235 else if (WideVT == MVT::i32)
3236 LC = RTLIB::MUL_I32;
3237 else if (WideVT == MVT::i64)
3238 LC = RTLIB::MUL_I64;
3239 else if (WideVT == MVT::i128)
3240 LC = RTLIB::MUL_I128;
3241 assert(LC != RTLIB::UNKNOWN_LIBCALL && "Cannot expand this operation!");
3243 // The high part is obtained by SRA'ing all but one of the bits of low
3245 unsigned LoSize = VT.getSizeInBits();
3246 SDValue HiLHS = DAG.getNode(ISD::SRA, dl, VT, RHS,
3247 DAG.getConstant(LoSize-1, TLI.getPointerTy()));
3248 SDValue HiRHS = DAG.getNode(ISD::SRA, dl, VT, LHS,
3249 DAG.getConstant(LoSize-1, TLI.getPointerTy()));
3251 // Here we're passing the 2 arguments explicitly as 4 arguments that are
3252 // pre-lowered to the correct types. This all depends upon WideVT not
3253 // being a legal type for the architecture and thus has to be split to
3255 SDValue Args[] = { LHS, HiLHS, RHS, HiRHS };
3256 SDValue Ret = ExpandLibCall(LC, WideVT, Args, 4, isSigned, dl);
3257 BottomHalf = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, VT, Ret,
3258 DAG.getIntPtrConstant(0));
3259 TopHalf = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, VT, Ret,
3260 DAG.getIntPtrConstant(1));
3261 // Ret is a node with an illegal type. Because such things are not
3262 // generally permitted during this phase of legalization, delete the
3263 // node. The above EXTRACT_ELEMENT nodes should have been folded.
3264 DAG.DeleteNode(Ret.getNode());
3268 Tmp1 = DAG.getConstant(VT.getSizeInBits() - 1,
3269 TLI.getShiftAmountTy(BottomHalf.getValueType()));
3270 Tmp1 = DAG.getNode(ISD::SRA, dl, VT, BottomHalf, Tmp1);
3271 TopHalf = DAG.getSetCC(dl, TLI.getSetCCResultType(VT), TopHalf, Tmp1,
3274 TopHalf = DAG.getSetCC(dl, TLI.getSetCCResultType(VT), TopHalf,
3275 DAG.getConstant(0, VT), ISD::SETNE);
3277 Results.push_back(BottomHalf);
3278 Results.push_back(TopHalf);
3281 case ISD::BUILD_PAIR: {
3282 EVT PairTy = Node->getValueType(0);
3283 Tmp1 = DAG.getNode(ISD::ZERO_EXTEND, dl, PairTy, Node->getOperand(0));
3284 Tmp2 = DAG.getNode(ISD::ANY_EXTEND, dl, PairTy, Node->getOperand(1));
3285 Tmp2 = DAG.getNode(ISD::SHL, dl, PairTy, Tmp2,
3286 DAG.getConstant(PairTy.getSizeInBits()/2,
3287 TLI.getShiftAmountTy(PairTy)));
3288 Results.push_back(DAG.getNode(ISD::OR, dl, PairTy, Tmp1, Tmp2));
3292 Tmp1 = Node->getOperand(0);
3293 Tmp2 = Node->getOperand(1);
3294 Tmp3 = Node->getOperand(2);
3295 if (Tmp1.getOpcode() == ISD::SETCC) {
3296 Tmp1 = DAG.getSelectCC(dl, Tmp1.getOperand(0), Tmp1.getOperand(1),
3298 cast<CondCodeSDNode>(Tmp1.getOperand(2))->get());
3300 Tmp1 = DAG.getSelectCC(dl, Tmp1,
3301 DAG.getConstant(0, Tmp1.getValueType()),
3302 Tmp2, Tmp3, ISD::SETNE);
3304 Results.push_back(Tmp1);
3307 SDValue Chain = Node->getOperand(0);
3308 SDValue Table = Node->getOperand(1);
3309 SDValue Index = Node->getOperand(2);
3311 EVT PTy = TLI.getPointerTy();
3313 const TargetData &TD = *TLI.getTargetData();
3314 unsigned EntrySize =
3315 DAG.getMachineFunction().getJumpTableInfo()->getEntrySize(TD);
3317 Index = DAG.getNode(ISD::MUL, dl, PTy,
3318 Index, DAG.getConstant(EntrySize, PTy));
3319 SDValue Addr = DAG.getNode(ISD::ADD, dl, PTy, Index, Table);
3321 EVT MemVT = EVT::getIntegerVT(*DAG.getContext(), EntrySize * 8);
3322 SDValue LD = DAG.getExtLoad(ISD::SEXTLOAD, dl, PTy, Chain, Addr,
3323 MachinePointerInfo::getJumpTable(), MemVT,
3326 if (TM.getRelocationModel() == Reloc::PIC_) {
3327 // For PIC, the sequence is:
3328 // BRIND(load(Jumptable + index) + RelocBase)
3329 // RelocBase can be JumpTable, GOT or some sort of global base.
3330 Addr = DAG.getNode(ISD::ADD, dl, PTy, Addr,
3331 TLI.getPICJumpTableRelocBase(Table, DAG));
3333 Tmp1 = DAG.getNode(ISD::BRIND, dl, MVT::Other, LD.getValue(1), Addr);
3334 Results.push_back(Tmp1);
3338 // Expand brcond's setcc into its constituent parts and create a BR_CC
3340 Tmp1 = Node->getOperand(0);
3341 Tmp2 = Node->getOperand(1);
3342 if (Tmp2.getOpcode() == ISD::SETCC) {
3343 Tmp1 = DAG.getNode(ISD::BR_CC, dl, MVT::Other,
3344 Tmp1, Tmp2.getOperand(2),
3345 Tmp2.getOperand(0), Tmp2.getOperand(1),
3346 Node->getOperand(2));
3348 // We test only the i1 bit. Skip the AND if UNDEF.
3349 Tmp3 = (Tmp2.getOpcode() == ISD::UNDEF) ? Tmp2 :
3350 DAG.getNode(ISD::AND, dl, Tmp2.getValueType(), Tmp2,
3351 DAG.getConstant(1, Tmp2.getValueType()));
3352 Tmp1 = DAG.getNode(ISD::BR_CC, dl, MVT::Other, Tmp1,
3353 DAG.getCondCode(ISD::SETNE), Tmp3,
3354 DAG.getConstant(0, Tmp3.getValueType()),
3355 Node->getOperand(2));
3357 Results.push_back(Tmp1);
3360 Tmp1 = Node->getOperand(0);
3361 Tmp2 = Node->getOperand(1);
3362 Tmp3 = Node->getOperand(2);
3363 LegalizeSetCCCondCode(Node->getValueType(0), Tmp1, Tmp2, Tmp3, dl);
3365 // If we expanded the SETCC into an AND/OR, return the new node
3366 if (Tmp2.getNode() == 0) {
3367 Results.push_back(Tmp1);
3371 // Otherwise, SETCC for the given comparison type must be completely
3372 // illegal; expand it into a SELECT_CC.
3373 EVT VT = Node->getValueType(0);
3374 Tmp1 = DAG.getNode(ISD::SELECT_CC, dl, VT, Tmp1, Tmp2,
3375 DAG.getConstant(1, VT), DAG.getConstant(0, VT), Tmp3);
3376 Results.push_back(Tmp1);
3379 case ISD::SELECT_CC: {
3380 Tmp1 = Node->getOperand(0); // LHS
3381 Tmp2 = Node->getOperand(1); // RHS
3382 Tmp3 = Node->getOperand(2); // True
3383 Tmp4 = Node->getOperand(3); // False
3384 SDValue CC = Node->getOperand(4);
3386 LegalizeSetCCCondCode(TLI.getSetCCResultType(Tmp1.getValueType()),
3387 Tmp1, Tmp2, CC, dl);
3389 assert(!Tmp2.getNode() && "Can't legalize SELECT_CC with legal condition!");
3390 Tmp2 = DAG.getConstant(0, Tmp1.getValueType());
3391 CC = DAG.getCondCode(ISD::SETNE);
3392 Tmp1 = DAG.getNode(ISD::SELECT_CC, dl, Node->getValueType(0), Tmp1, Tmp2,
3394 Results.push_back(Tmp1);
3398 Tmp1 = Node->getOperand(0); // Chain
3399 Tmp2 = Node->getOperand(2); // LHS
3400 Tmp3 = Node->getOperand(3); // RHS
3401 Tmp4 = Node->getOperand(1); // CC
3403 LegalizeSetCCCondCode(TLI.getSetCCResultType(Tmp2.getValueType()),
3404 Tmp2, Tmp3, Tmp4, dl);
3406 assert(!Tmp3.getNode() && "Can't legalize BR_CC with legal condition!");
3407 Tmp3 = DAG.getConstant(0, Tmp2.getValueType());
3408 Tmp4 = DAG.getCondCode(ISD::SETNE);
3409 Tmp1 = DAG.getNode(ISD::BR_CC, dl, Node->getValueType(0), Tmp1, Tmp4, Tmp2,
3410 Tmp3, Node->getOperand(4));
3411 Results.push_back(Tmp1);
3414 case ISD::BUILD_VECTOR:
3415 Results.push_back(ExpandBUILD_VECTOR(Node));
3420 // Scalarize vector SRA/SRL/SHL.
3421 EVT VT = Node->getValueType(0);
3422 assert(VT.isVector() && "Unable to legalize non-vector shift");
3423 assert(TLI.isTypeLegal(VT.getScalarType())&& "Element type must be legal");
3424 unsigned NumElem = VT.getVectorNumElements();
3426 SmallVector<SDValue, 8> Scalars;
3427 for (unsigned Idx = 0; Idx < NumElem; Idx++) {
3428 SDValue Ex = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl,
3430 Node->getOperand(0), DAG.getIntPtrConstant(Idx));
3431 SDValue Sh = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl,
3433 Node->getOperand(1), DAG.getIntPtrConstant(Idx));
3434 Scalars.push_back(DAG.getNode(Node->getOpcode(), dl,
3435 VT.getScalarType(), Ex, Sh));
3438 DAG.getNode(ISD::BUILD_VECTOR, dl, Node->getValueType(0),
3439 &Scalars[0], Scalars.size());
3440 ReplaceNode(SDValue(Node, 0), Result);
3443 case ISD::GLOBAL_OFFSET_TABLE:
3444 case ISD::GlobalAddress:
3445 case ISD::GlobalTLSAddress:
3446 case ISD::ExternalSymbol:
3447 case ISD::ConstantPool:
3448 case ISD::JumpTable:
3449 case ISD::INTRINSIC_W_CHAIN:
3450 case ISD::INTRINSIC_WO_CHAIN:
3451 case ISD::INTRINSIC_VOID:
3452 // FIXME: Custom lowering for these operations shouldn't return null!
3456 // Replace the original node with the legalized result.
3457 if (!Results.empty())
3458 ReplaceNode(Node, Results.data());
3461 void SelectionDAGLegalize::PromoteNode(SDNode *Node) {
3462 SmallVector<SDValue, 8> Results;
3463 EVT OVT = Node->getValueType(0);
3464 if (Node->getOpcode() == ISD::UINT_TO_FP ||
3465 Node->getOpcode() == ISD::SINT_TO_FP ||
3466 Node->getOpcode() == ISD::SETCC) {
3467 OVT = Node->getOperand(0).getValueType();
3469 EVT NVT = TLI.getTypeToPromoteTo(Node->getOpcode(), OVT);
3470 DebugLoc dl = Node->getDebugLoc();
3471 SDValue Tmp1, Tmp2, Tmp3;
3472 switch (Node->getOpcode()) {
3474 case ISD::CTTZ_ZERO_UNDEF:
3476 case ISD::CTLZ_ZERO_UNDEF:
3478 // Zero extend the argument.
3479 Tmp1 = DAG.getNode(ISD::ZERO_EXTEND, dl, NVT, Node->getOperand(0));
3480 // Perform the larger operation. For CTPOP and CTTZ_ZERO_UNDEF, this is
3481 // already the correct result.
3482 Tmp1 = DAG.getNode(Node->getOpcode(), dl, NVT, Tmp1);
3483 if (Node->getOpcode() == ISD::CTTZ) {
3484 // FIXME: This should set a bit in the zero extended value instead.
3485 Tmp2 = DAG.getSetCC(dl, TLI.getSetCCResultType(NVT),
3486 Tmp1, DAG.getConstant(NVT.getSizeInBits(), NVT),
3488 Tmp1 = DAG.getNode(ISD::SELECT, dl, NVT, Tmp2,
3489 DAG.getConstant(OVT.getSizeInBits(), NVT), Tmp1);
3490 } else if (Node->getOpcode() == ISD::CTLZ ||
3491 Node->getOpcode() == ISD::CTLZ_ZERO_UNDEF) {
3492 // Tmp1 = Tmp1 - (sizeinbits(NVT) - sizeinbits(Old VT))
3493 Tmp1 = DAG.getNode(ISD::SUB, dl, NVT, Tmp1,
3494 DAG.getConstant(NVT.getSizeInBits() -
3495 OVT.getSizeInBits(), NVT));
3497 Results.push_back(DAG.getNode(ISD::TRUNCATE, dl, OVT, Tmp1));
3500 unsigned DiffBits = NVT.getSizeInBits() - OVT.getSizeInBits();
3501 Tmp1 = DAG.getNode(ISD::ZERO_EXTEND, dl, NVT, Node->getOperand(0));
3502 Tmp1 = DAG.getNode(ISD::BSWAP, dl, NVT, Tmp1);
3503 Tmp1 = DAG.getNode(ISD::SRL, dl, NVT, Tmp1,
3504 DAG.getConstant(DiffBits, TLI.getShiftAmountTy(NVT)));
3505 Results.push_back(Tmp1);
3508 case ISD::FP_TO_UINT:
3509 case ISD::FP_TO_SINT:
3510 Tmp1 = PromoteLegalFP_TO_INT(Node->getOperand(0), Node->getValueType(0),
3511 Node->getOpcode() == ISD::FP_TO_SINT, dl);
3512 Results.push_back(Tmp1);
3514 case ISD::UINT_TO_FP:
3515 case ISD::SINT_TO_FP:
3516 Tmp1 = PromoteLegalINT_TO_FP(Node->getOperand(0), Node->getValueType(0),
3517 Node->getOpcode() == ISD::SINT_TO_FP, dl);
3518 Results.push_back(Tmp1);
3523 unsigned ExtOp, TruncOp;
3524 if (OVT.isVector()) {
3525 ExtOp = ISD::BITCAST;
3526 TruncOp = ISD::BITCAST;
3528 assert(OVT.isInteger() && "Cannot promote logic operation");
3529 ExtOp = ISD::ANY_EXTEND;
3530 TruncOp = ISD::TRUNCATE;
3532 // Promote each of the values to the new type.
3533 Tmp1 = DAG.getNode(ExtOp, dl, NVT, Node->getOperand(0));
3534 Tmp2 = DAG.getNode(ExtOp, dl, NVT, Node->getOperand(1));
3535 // Perform the larger operation, then convert back
3536 Tmp1 = DAG.getNode(Node->getOpcode(), dl, NVT, Tmp1, Tmp2);
3537 Results.push_back(DAG.getNode(TruncOp, dl, OVT, Tmp1));
3541 unsigned ExtOp, TruncOp;
3542 if (Node->getValueType(0).isVector()) {
3543 ExtOp = ISD::BITCAST;
3544 TruncOp = ISD::BITCAST;
3545 } else if (Node->getValueType(0).isInteger()) {
3546 ExtOp = ISD::ANY_EXTEND;
3547 TruncOp = ISD::TRUNCATE;
3549 ExtOp = ISD::FP_EXTEND;
3550 TruncOp = ISD::FP_ROUND;
3552 Tmp1 = Node->getOperand(0);
3553 // Promote each of the values to the new type.
3554 Tmp2 = DAG.getNode(ExtOp, dl, NVT, Node->getOperand(1));
3555 Tmp3 = DAG.getNode(ExtOp, dl, NVT, Node->getOperand(2));
3556 // Perform the larger operation, then round down.
3557 Tmp1 = DAG.getNode(ISD::SELECT, dl, NVT, Tmp1, Tmp2, Tmp3);
3558 if (TruncOp != ISD::FP_ROUND)
3559 Tmp1 = DAG.getNode(TruncOp, dl, Node->getValueType(0), Tmp1);
3561 Tmp1 = DAG.getNode(TruncOp, dl, Node->getValueType(0), Tmp1,
3562 DAG.getIntPtrConstant(0));
3563 Results.push_back(Tmp1);
3566 case ISD::VECTOR_SHUFFLE: {
3567 ArrayRef<int> Mask = cast<ShuffleVectorSDNode>(Node)->getMask();
3569 // Cast the two input vectors.
3570 Tmp1 = DAG.getNode(ISD::BITCAST, dl, NVT, Node->getOperand(0));
3571 Tmp2 = DAG.getNode(ISD::BITCAST, dl, NVT, Node->getOperand(1));
3573 // Convert the shuffle mask to the right # elements.
3574 Tmp1 = ShuffleWithNarrowerEltType(NVT, OVT, dl, Tmp1, Tmp2, Mask);
3575 Tmp1 = DAG.getNode(ISD::BITCAST, dl, OVT, Tmp1);
3576 Results.push_back(Tmp1);
3580 unsigned ExtOp = ISD::FP_EXTEND;
3581 if (NVT.isInteger()) {
3582 ISD::CondCode CCCode =
3583 cast<CondCodeSDNode>(Node->getOperand(2))->get();
3584 ExtOp = isSignedIntSetCC(CCCode) ? ISD::SIGN_EXTEND : ISD::ZERO_EXTEND;
3586 Tmp1 = DAG.getNode(ExtOp, dl, NVT, Node->getOperand(0));
3587 Tmp2 = DAG.getNode(ExtOp, dl, NVT, Node->getOperand(1));
3588 Results.push_back(DAG.getNode(ISD::SETCC, dl, Node->getValueType(0),
3589 Tmp1, Tmp2, Node->getOperand(2)));
3593 Tmp1 = DAG.getNode(ISD::FP_EXTEND, dl, NVT, Node->getOperand(0));
3594 Tmp2 = DAG.getNode(ISD::FP_EXTEND, dl, NVT, Node->getOperand(1));
3595 Tmp3 = DAG.getNode(ISD::FPOW, dl, NVT, Tmp1, Tmp2);
3596 Results.push_back(DAG.getNode(ISD::FP_ROUND, dl, OVT,
3597 Tmp3, DAG.getIntPtrConstant(0)));
3604 Tmp1 = DAG.getNode(ISD::FP_EXTEND, dl, NVT, Node->getOperand(0));
3605 Tmp2 = DAG.getNode(Node->getOpcode(), dl, NVT, Tmp1);
3606 Results.push_back(DAG.getNode(ISD::FP_ROUND, dl, OVT,
3607 Tmp2, DAG.getIntPtrConstant(0)));
3612 // Replace the original node with the legalized result.
3613 if (!Results.empty())
3614 ReplaceNode(Node, Results.data());
3617 // SelectionDAG::Legalize - This is the entry point for the file.
3619 void SelectionDAG::Legalize() {
3620 /// run - This is the main entry point to this class.
3622 SelectionDAGLegalize(*this).LegalizeDAG();