1//===-------- LegalizeTypesGeneric.cpp - Generic type legalization --------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file implements generic type expansion and splitting for LegalizeTypes.
11// The routines here perform legalization when the details of the type (such as
12// whether it is an integer or a float) do not matter.
13// Expansion is the act of changing a computation in an illegal type to be a
14// computation in two identical registers of a smaller type.  The Lo/Hi part
15// is required to be stored first in memory on little/big-endian machines.
16// Splitting is the act of changing a computation in an illegal type to be a
17// computation in two not necessarily identical registers of a smaller type.
18// There are no requirements on how the type is represented in memory.
19//
20//===----------------------------------------------------------------------===//
21
22#include "LegalizeTypes.h"
23#include "llvm/IR/DataLayout.h"
24using namespace llvm;
25
26#define DEBUG_TYPE "legalize-types"
27
28//===----------------------------------------------------------------------===//
29// Generic Result Expansion.
30//===----------------------------------------------------------------------===//
31
32// These routines assume that the Lo/Hi part is stored first in memory on
33// little/big-endian machines, followed by the Hi/Lo part.  This means that
34// they cannot be used as is on vectors, for which Lo is always stored first.
35void DAGTypeLegalizer::ExpandRes_MERGE_VALUES(SDNode *N, unsigned ResNo,
36                                              SDValue &Lo, SDValue &Hi) {
37  SDValue Op = DisintegrateMERGE_VALUES(N, ResNo);
38  GetExpandedOp(Op, Lo, Hi);
39}
40
41void DAGTypeLegalizer::ExpandRes_BITCAST(SDNode *N, SDValue &Lo, SDValue &Hi) {
42  EVT OutVT = N->getValueType(0);
43  EVT NOutVT = TLI.getTypeToTransformTo(*DAG.getContext(), OutVT);
44  SDValue InOp = N->getOperand(0);
45  EVT InVT = InOp.getValueType();
46  SDLoc dl(N);
47
48  // Handle some special cases efficiently.
49  switch (getTypeAction(InVT)) {
50    case TargetLowering::TypeLegal:
51    case TargetLowering::TypePromoteInteger:
52      break;
53    case TargetLowering::TypePromoteFloat:
54      llvm_unreachable("Bitcast of a promotion-needing float should never need"
55                       "expansion");
56    case TargetLowering::TypeSoftenFloat: {
57      // Expand the floating point operand only if it was converted to integers.
58      // Otherwise, it is a legal type like f128 that can be saved in a register.
59      auto SoftenedOp = GetSoftenedFloat(InOp);
60      if (SoftenedOp == InOp)
61        break;
62      SplitInteger(SoftenedOp, Lo, Hi);
63      Lo = DAG.getNode(ISD::BITCAST, dl, NOutVT, Lo);
64      Hi = DAG.getNode(ISD::BITCAST, dl, NOutVT, Hi);
65      return;
66    }
67    case TargetLowering::TypeExpandInteger:
68    case TargetLowering::TypeExpandFloat: {
69      auto &DL = DAG.getDataLayout();
70      // Convert the expanded pieces of the input.
71      GetExpandedOp(InOp, Lo, Hi);
72      if (TLI.hasBigEndianPartOrdering(InVT, DL) !=
73          TLI.hasBigEndianPartOrdering(OutVT, DL))
74        std::swap(Lo, Hi);
75      Lo = DAG.getNode(ISD::BITCAST, dl, NOutVT, Lo);
76      Hi = DAG.getNode(ISD::BITCAST, dl, NOutVT, Hi);
77      return;
78    }
79    case TargetLowering::TypeSplitVector:
80      GetSplitVector(InOp, Lo, Hi);
81      if (TLI.hasBigEndianPartOrdering(OutVT, DAG.getDataLayout()))
82        std::swap(Lo, Hi);
83      Lo = DAG.getNode(ISD::BITCAST, dl, NOutVT, Lo);
84      Hi = DAG.getNode(ISD::BITCAST, dl, NOutVT, Hi);
85      return;
86    case TargetLowering::TypeScalarizeVector:
87      // Convert the element instead.
88      SplitInteger(BitConvertToInteger(GetScalarizedVector(InOp)), Lo, Hi);
89      Lo = DAG.getNode(ISD::BITCAST, dl, NOutVT, Lo);
90      Hi = DAG.getNode(ISD::BITCAST, dl, NOutVT, Hi);
91      return;
92    case TargetLowering::TypeWidenVector: {
93      assert(!(InVT.getVectorNumElements() & 1) && "Unsupported BITCAST");
94      InOp = GetWidenedVector(InOp);
95      EVT LoVT, HiVT;
96      std::tie(LoVT, HiVT) = DAG.GetSplitDestVTs(InVT);
97      std::tie(Lo, Hi) = DAG.SplitVector(InOp, dl, LoVT, HiVT);
98      if (TLI.hasBigEndianPartOrdering(OutVT, DAG.getDataLayout()))
99        std::swap(Lo, Hi);
100      Lo = DAG.getNode(ISD::BITCAST, dl, NOutVT, Lo);
101      Hi = DAG.getNode(ISD::BITCAST, dl, NOutVT, Hi);
102      return;
103    }
104  }
105
106  if (InVT.isVector() && OutVT.isInteger()) {
107    // Handle cases like i64 = BITCAST v1i64 on x86, where the operand
108    // is legal but the result is not.
109    unsigned NumElems = 2;
110    EVT ElemVT = NOutVT;
111    EVT NVT = EVT::getVectorVT(*DAG.getContext(), ElemVT, NumElems);
112
113    // If <ElemVT * N> is not a legal type, try <ElemVT/2 * (N*2)>.
114    while (!isTypeLegal(NVT)) {
115      unsigned NewSizeInBits = ElemVT.getSizeInBits() / 2;
116      // If the element size is smaller than byte, bail.
117      if (NewSizeInBits < 8)
118        break;
119      NumElems *= 2;
120      ElemVT = EVT::getIntegerVT(*DAG.getContext(), NewSizeInBits);
121      NVT = EVT::getVectorVT(*DAG.getContext(), ElemVT, NumElems);
122    }
123
124    if (isTypeLegal(NVT)) {
125      SDValue CastInOp = DAG.getNode(ISD::BITCAST, dl, NVT, InOp);
126
127      SmallVector<SDValue, 8> Vals;
128      for (unsigned i = 0; i < NumElems; ++i)
129        Vals.push_back(DAG.getNode(
130            ISD::EXTRACT_VECTOR_ELT, dl, ElemVT, CastInOp,
131            DAG.getConstant(i, dl, TLI.getVectorIdxTy(DAG.getDataLayout()))));
132
133      // Build Lo, Hi pair by pairing extracted elements if needed.
134      unsigned Slot = 0;
135      for (unsigned e = Vals.size(); e - Slot > 2; Slot += 2, e += 1) {
136        // Each iteration will BUILD_PAIR two nodes and append the result until
137        // there are only two nodes left, i.e. Lo and Hi.
138        SDValue LHS = Vals[Slot];
139        SDValue RHS = Vals[Slot + 1];
140
141        if (DAG.getDataLayout().isBigEndian())
142          std::swap(LHS, RHS);
143
144        Vals.push_back(DAG.getNode(ISD::BUILD_PAIR, dl,
145                                   EVT::getIntegerVT(
146                                     *DAG.getContext(),
147                                     LHS.getValueType().getSizeInBits() << 1),
148                                   LHS, RHS));
149      }
150      Lo = Vals[Slot++];
151      Hi = Vals[Slot++];
152
153      if (DAG.getDataLayout().isBigEndian())
154        std::swap(Lo, Hi);
155
156      return;
157    }
158  }
159
160  // Lower the bit-convert to a store/load from the stack.
161  assert(NOutVT.isByteSized() && "Expanded type not byte sized!");
162
163  // Create the stack frame object.  Make sure it is aligned for both
164  // the source and expanded destination types.
165  unsigned Alignment = DAG.getDataLayout().getPrefTypeAlignment(
166      NOutVT.getTypeForEVT(*DAG.getContext()));
167  SDValue StackPtr = DAG.CreateStackTemporary(InVT, Alignment);
168  int SPFI = cast<FrameIndexSDNode>(StackPtr.getNode())->getIndex();
169  MachinePointerInfo PtrInfo =
170      MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), SPFI);
171
172  // Emit a store to the stack slot.
173  SDValue Store = DAG.getStore(DAG.getEntryNode(), dl, InOp, StackPtr, PtrInfo,
174                               false, false, 0);
175
176  // Load the first half from the stack slot.
177  Lo = DAG.getLoad(NOutVT, dl, Store, StackPtr, PtrInfo,
178                   false, false, false, 0);
179
180  // Increment the pointer to the other half.
181  unsigned IncrementSize = NOutVT.getSizeInBits() / 8;
182  StackPtr = DAG.getNode(ISD::ADD, dl, StackPtr.getValueType(), StackPtr,
183                         DAG.getConstant(IncrementSize, dl,
184                                         StackPtr.getValueType()));
185
186  // Load the second half from the stack slot.
187  Hi = DAG.getLoad(NOutVT, dl, Store, StackPtr,
188                   PtrInfo.getWithOffset(IncrementSize), false,
189                   false, false, MinAlign(Alignment, IncrementSize));
190
191  // Handle endianness of the load.
192  if (TLI.hasBigEndianPartOrdering(OutVT, DAG.getDataLayout()))
193    std::swap(Lo, Hi);
194}
195
196void DAGTypeLegalizer::ExpandRes_BUILD_PAIR(SDNode *N, SDValue &Lo,
197                                            SDValue &Hi) {
198  // Return the operands.
199  Lo = N->getOperand(0);
200  Hi = N->getOperand(1);
201}
202
203void DAGTypeLegalizer::ExpandRes_EXTRACT_ELEMENT(SDNode *N, SDValue &Lo,
204                                                 SDValue &Hi) {
205  GetExpandedOp(N->getOperand(0), Lo, Hi);
206  SDValue Part = cast<ConstantSDNode>(N->getOperand(1))->getZExtValue() ?
207                   Hi : Lo;
208
209  assert(Part.getValueType() == N->getValueType(0) &&
210         "Type twice as big as expanded type not itself expanded!");
211
212  GetPairElements(Part, Lo, Hi);
213}
214
215void DAGTypeLegalizer::ExpandRes_EXTRACT_VECTOR_ELT(SDNode *N, SDValue &Lo,
216                                                    SDValue &Hi) {
217  SDValue OldVec = N->getOperand(0);
218  unsigned OldElts = OldVec.getValueType().getVectorNumElements();
219  EVT OldEltVT = OldVec.getValueType().getVectorElementType();
220  SDLoc dl(N);
221
222  // Convert to a vector of the expanded element type, for example
223  // <3 x i64> -> <6 x i32>.
224  EVT OldVT = N->getValueType(0);
225  EVT NewVT = TLI.getTypeToTransformTo(*DAG.getContext(), OldVT);
226
227  if (OldVT != OldEltVT) {
228    // The result of EXTRACT_VECTOR_ELT may be larger than the element type of
229    // the input vector.  If so, extend the elements of the input vector to the
230    // same bitwidth as the result before expanding.
231    assert(OldEltVT.bitsLT(OldVT) && "Result type smaller then element type!");
232    EVT NVecVT = EVT::getVectorVT(*DAG.getContext(), OldVT, OldElts);
233    OldVec = DAG.getNode(ISD::ANY_EXTEND, dl, NVecVT, N->getOperand(0));
234  }
235
236  SDValue NewVec = DAG.getNode(ISD::BITCAST, dl,
237                               EVT::getVectorVT(*DAG.getContext(),
238                                                NewVT, 2*OldElts),
239                               OldVec);
240
241  // Extract the elements at 2 * Idx and 2 * Idx + 1 from the new vector.
242  SDValue Idx = N->getOperand(1);
243
244  Idx = DAG.getNode(ISD::ADD, dl, Idx.getValueType(), Idx, Idx);
245  Lo = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, NewVT, NewVec, Idx);
246
247  Idx = DAG.getNode(ISD::ADD, dl, Idx.getValueType(), Idx,
248                    DAG.getConstant(1, dl, Idx.getValueType()));
249  Hi = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, NewVT, NewVec, Idx);
250
251  if (DAG.getDataLayout().isBigEndian())
252    std::swap(Lo, Hi);
253}
254
255void DAGTypeLegalizer::ExpandRes_NormalLoad(SDNode *N, SDValue &Lo,
256                                            SDValue &Hi) {
257  assert(ISD::isNormalLoad(N) && "This routine only for normal loads!");
258  SDLoc dl(N);
259
260  LoadSDNode *LD = cast<LoadSDNode>(N);
261  EVT ValueVT = LD->getValueType(0);
262  EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), ValueVT);
263  SDValue Chain = LD->getChain();
264  SDValue Ptr = LD->getBasePtr();
265  unsigned Alignment = LD->getAlignment();
266  bool isVolatile = LD->isVolatile();
267  bool isNonTemporal = LD->isNonTemporal();
268  bool isInvariant = LD->isInvariant();
269  AAMDNodes AAInfo = LD->getAAInfo();
270
271  assert(NVT.isByteSized() && "Expanded type not byte sized!");
272
273  Lo = DAG.getLoad(NVT, dl, Chain, Ptr, LD->getPointerInfo(),
274                   isVolatile, isNonTemporal, isInvariant, Alignment,
275                   AAInfo);
276
277  // Increment the pointer to the other half.
278  unsigned IncrementSize = NVT.getSizeInBits() / 8;
279  Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr,
280                    DAG.getConstant(IncrementSize, dl, Ptr.getValueType()));
281  Hi = DAG.getLoad(NVT, dl, Chain, Ptr,
282                   LD->getPointerInfo().getWithOffset(IncrementSize),
283                   isVolatile, isNonTemporal, isInvariant,
284                   MinAlign(Alignment, IncrementSize), AAInfo);
285
286  // Build a factor node to remember that this load is independent of the
287  // other one.
288  Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Lo.getValue(1),
289                      Hi.getValue(1));
290
291  // Handle endianness of the load.
292  if (TLI.hasBigEndianPartOrdering(ValueVT, DAG.getDataLayout()))
293    std::swap(Lo, Hi);
294
295  // Modified the chain - switch anything that used the old chain to use
296  // the new one.
297  ReplaceValueWith(SDValue(N, 1), Chain);
298}
299
300void DAGTypeLegalizer::ExpandRes_VAARG(SDNode *N, SDValue &Lo, SDValue &Hi) {
301  EVT OVT = N->getValueType(0);
302  EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), OVT);
303  SDValue Chain = N->getOperand(0);
304  SDValue Ptr = N->getOperand(1);
305  SDLoc dl(N);
306  const unsigned Align = N->getConstantOperandVal(3);
307
308  Lo = DAG.getVAArg(NVT, dl, Chain, Ptr, N->getOperand(2), Align);
309  Hi = DAG.getVAArg(NVT, dl, Lo.getValue(1), Ptr, N->getOperand(2), 0);
310
311  // Handle endianness of the load.
312  if (TLI.hasBigEndianPartOrdering(OVT, DAG.getDataLayout()))
313    std::swap(Lo, Hi);
314
315  // Modified the chain - switch anything that used the old chain to use
316  // the new one.
317  ReplaceValueWith(SDValue(N, 1), Hi.getValue(1));
318}
319
320
321//===--------------------------------------------------------------------===//
322// Generic Operand Expansion.
323//===--------------------------------------------------------------------===//
324
325void DAGTypeLegalizer::IntegerToVector(SDValue Op, unsigned NumElements,
326                                       SmallVectorImpl<SDValue> &Ops,
327                                       EVT EltVT) {
328  assert(Op.getValueType().isInteger());
329  SDLoc DL(Op);
330  SDValue Parts[2];
331
332  if (NumElements > 1) {
333    NumElements >>= 1;
334    SplitInteger(Op, Parts[0], Parts[1]);
335    if (DAG.getDataLayout().isBigEndian())
336        std::swap(Parts[0], Parts[1]);
337    IntegerToVector(Parts[0], NumElements, Ops, EltVT);
338    IntegerToVector(Parts[1], NumElements, Ops, EltVT);
339  } else {
340    Ops.push_back(DAG.getNode(ISD::BITCAST, DL, EltVT, Op));
341  }
342}
343
344SDValue DAGTypeLegalizer::ExpandOp_BITCAST(SDNode *N) {
345  SDLoc dl(N);
346  if (N->getValueType(0).isVector()) {
347    // An illegal expanding type is being converted to a legal vector type.
348    // Make a two element vector out of the expanded parts and convert that
349    // instead, but only if the new vector type is legal (otherwise there
350    // is no point, and it might create expansion loops).  For example, on
351    // x86 this turns v1i64 = BITCAST i64 into v1i64 = BITCAST v2i32.
352    //
353    // FIXME: I'm not sure why we are first trying to split the input into
354    // a 2 element vector, so I'm leaving it here to maintain the current
355    // behavior.
356    unsigned NumElts = 2;
357    EVT OVT = N->getOperand(0).getValueType();
358    EVT NVT = EVT::getVectorVT(*DAG.getContext(),
359                               TLI.getTypeToTransformTo(*DAG.getContext(), OVT),
360                               NumElts);
361    if (!isTypeLegal(NVT)) {
362      // If we can't find a legal type by splitting the integer in half,
363      // then we can use the node's value type.
364      NumElts = N->getValueType(0).getVectorNumElements();
365      NVT = N->getValueType(0);
366    }
367
368    SmallVector<SDValue, 8> Ops;
369    IntegerToVector(N->getOperand(0), NumElts, Ops, NVT.getVectorElementType());
370
371    SDValue Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, NVT,
372                              makeArrayRef(Ops.data(), NumElts));
373    return DAG.getNode(ISD::BITCAST, dl, N->getValueType(0), Vec);
374  }
375
376  // Otherwise, store to a temporary and load out again as the new type.
377  return CreateStackStoreLoad(N->getOperand(0), N->getValueType(0));
378}
379
380SDValue DAGTypeLegalizer::ExpandOp_BUILD_VECTOR(SDNode *N) {
381  // The vector type is legal but the element type needs expansion.
382  EVT VecVT = N->getValueType(0);
383  unsigned NumElts = VecVT.getVectorNumElements();
384  EVT OldVT = N->getOperand(0).getValueType();
385  EVT NewVT = TLI.getTypeToTransformTo(*DAG.getContext(), OldVT);
386  SDLoc dl(N);
387
388  assert(OldVT == VecVT.getVectorElementType() &&
389         "BUILD_VECTOR operand type doesn't match vector element type!");
390
391  // Build a vector of twice the length out of the expanded elements.
392  // For example <3 x i64> -> <6 x i32>.
393  std::vector<SDValue> NewElts;
394  NewElts.reserve(NumElts*2);
395
396  for (unsigned i = 0; i < NumElts; ++i) {
397    SDValue Lo, Hi;
398    GetExpandedOp(N->getOperand(i), Lo, Hi);
399    if (DAG.getDataLayout().isBigEndian())
400      std::swap(Lo, Hi);
401    NewElts.push_back(Lo);
402    NewElts.push_back(Hi);
403  }
404
405  SDValue NewVec = DAG.getNode(ISD::BUILD_VECTOR, dl,
406                               EVT::getVectorVT(*DAG.getContext(),
407                                                NewVT, NewElts.size()),
408                               NewElts);
409
410  // Convert the new vector to the old vector type.
411  return DAG.getNode(ISD::BITCAST, dl, VecVT, NewVec);
412}
413
414SDValue DAGTypeLegalizer::ExpandOp_EXTRACT_ELEMENT(SDNode *N) {
415  SDValue Lo, Hi;
416  GetExpandedOp(N->getOperand(0), Lo, Hi);
417  return cast<ConstantSDNode>(N->getOperand(1))->getZExtValue() ? Hi : Lo;
418}
419
420SDValue DAGTypeLegalizer::ExpandOp_INSERT_VECTOR_ELT(SDNode *N) {
421  // The vector type is legal but the element type needs expansion.
422  EVT VecVT = N->getValueType(0);
423  unsigned NumElts = VecVT.getVectorNumElements();
424  SDLoc dl(N);
425
426  SDValue Val = N->getOperand(1);
427  EVT OldEVT = Val.getValueType();
428  EVT NewEVT = TLI.getTypeToTransformTo(*DAG.getContext(), OldEVT);
429
430  assert(OldEVT == VecVT.getVectorElementType() &&
431         "Inserted element type doesn't match vector element type!");
432
433  // Bitconvert to a vector of twice the length with elements of the expanded
434  // type, insert the expanded vector elements, and then convert back.
435  EVT NewVecVT = EVT::getVectorVT(*DAG.getContext(), NewEVT, NumElts*2);
436  SDValue NewVec = DAG.getNode(ISD::BITCAST, dl,
437                               NewVecVT, N->getOperand(0));
438
439  SDValue Lo, Hi;
440  GetExpandedOp(Val, Lo, Hi);
441  if (DAG.getDataLayout().isBigEndian())
442    std::swap(Lo, Hi);
443
444  SDValue Idx = N->getOperand(2);
445  Idx = DAG.getNode(ISD::ADD, dl, Idx.getValueType(), Idx, Idx);
446  NewVec = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, NewVecVT, NewVec, Lo, Idx);
447  Idx = DAG.getNode(ISD::ADD, dl,
448                    Idx.getValueType(), Idx,
449                    DAG.getConstant(1, dl, Idx.getValueType()));
450  NewVec =  DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, NewVecVT, NewVec, Hi, Idx);
451
452  // Convert the new vector to the old vector type.
453  return DAG.getNode(ISD::BITCAST, dl, VecVT, NewVec);
454}
455
456SDValue DAGTypeLegalizer::ExpandOp_SCALAR_TO_VECTOR(SDNode *N) {
457  SDLoc dl(N);
458  EVT VT = N->getValueType(0);
459  assert(VT.getVectorElementType() == N->getOperand(0).getValueType() &&
460         "SCALAR_TO_VECTOR operand type doesn't match vector element type!");
461  unsigned NumElts = VT.getVectorNumElements();
462  SmallVector<SDValue, 16> Ops(NumElts);
463  Ops[0] = N->getOperand(0);
464  SDValue UndefVal = DAG.getUNDEF(Ops[0].getValueType());
465  for (unsigned i = 1; i < NumElts; ++i)
466    Ops[i] = UndefVal;
467  return DAG.getNode(ISD::BUILD_VECTOR, dl, VT, Ops);
468}
469
470SDValue DAGTypeLegalizer::ExpandOp_NormalStore(SDNode *N, unsigned OpNo) {
471  assert(ISD::isNormalStore(N) && "This routine only for normal stores!");
472  assert(OpNo == 1 && "Can only expand the stored value so far");
473  SDLoc dl(N);
474
475  StoreSDNode *St = cast<StoreSDNode>(N);
476  EVT ValueVT = St->getValue().getValueType();
477  EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), ValueVT);
478  SDValue Chain = St->getChain();
479  SDValue Ptr = St->getBasePtr();
480  unsigned Alignment = St->getAlignment();
481  bool isVolatile = St->isVolatile();
482  bool isNonTemporal = St->isNonTemporal();
483  AAMDNodes AAInfo = St->getAAInfo();
484
485  assert(NVT.isByteSized() && "Expanded type not byte sized!");
486  unsigned IncrementSize = NVT.getSizeInBits() / 8;
487
488  SDValue Lo, Hi;
489  GetExpandedOp(St->getValue(), Lo, Hi);
490
491  if (TLI.hasBigEndianPartOrdering(ValueVT, DAG.getDataLayout()))
492    std::swap(Lo, Hi);
493
494  Lo = DAG.getStore(Chain, dl, Lo, Ptr, St->getPointerInfo(),
495                    isVolatile, isNonTemporal, Alignment, AAInfo);
496
497  Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr,
498                    DAG.getConstant(IncrementSize, dl, Ptr.getValueType()));
499  Hi = DAG.getStore(Chain, dl, Hi, Ptr,
500                    St->getPointerInfo().getWithOffset(IncrementSize),
501                    isVolatile, isNonTemporal,
502                    MinAlign(Alignment, IncrementSize), AAInfo);
503
504  return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Lo, Hi);
505}
506
507
508//===--------------------------------------------------------------------===//
509// Generic Result Splitting.
510//===--------------------------------------------------------------------===//
511
512// Be careful to make no assumptions about which of Lo/Hi is stored first in
513// memory (for vectors it is always Lo first followed by Hi in the following
514// bytes; for integers and floats it is Lo first if and only if the machine is
515// little-endian).
516
517void DAGTypeLegalizer::SplitRes_MERGE_VALUES(SDNode *N, unsigned ResNo,
518                                             SDValue &Lo, SDValue &Hi) {
519  SDValue Op = DisintegrateMERGE_VALUES(N, ResNo);
520  GetSplitOp(Op, Lo, Hi);
521}
522
523void DAGTypeLegalizer::SplitRes_SELECT(SDNode *N, SDValue &Lo,
524                                       SDValue &Hi) {
525  SDValue LL, LH, RL, RH, CL, CH;
526  SDLoc dl(N);
527  GetSplitOp(N->getOperand(1), LL, LH);
528  GetSplitOp(N->getOperand(2), RL, RH);
529
530  SDValue Cond = N->getOperand(0);
531  CL = CH = Cond;
532  if (Cond.getValueType().isVector()) {
533    // Check if there are already splitted versions of the vector available and
534    // use those instead of splitting the mask operand again.
535    if (getTypeAction(Cond.getValueType()) == TargetLowering::TypeSplitVector)
536      GetSplitVector(Cond, CL, CH);
537    else
538      std::tie(CL, CH) = DAG.SplitVector(Cond, dl);
539  }
540
541  Lo = DAG.getNode(N->getOpcode(), dl, LL.getValueType(), CL, LL, RL);
542  Hi = DAG.getNode(N->getOpcode(), dl, LH.getValueType(), CH, LH, RH);
543}
544
545void DAGTypeLegalizer::SplitRes_SELECT_CC(SDNode *N, SDValue &Lo,
546                                          SDValue &Hi) {
547  SDValue LL, LH, RL, RH;
548  SDLoc dl(N);
549  GetSplitOp(N->getOperand(2), LL, LH);
550  GetSplitOp(N->getOperand(3), RL, RH);
551
552  Lo = DAG.getNode(ISD::SELECT_CC, dl, LL.getValueType(), N->getOperand(0),
553                   N->getOperand(1), LL, RL, N->getOperand(4));
554  Hi = DAG.getNode(ISD::SELECT_CC, dl, LH.getValueType(), N->getOperand(0),
555                   N->getOperand(1), LH, RH, N->getOperand(4));
556}
557
558void DAGTypeLegalizer::SplitRes_UNDEF(SDNode *N, SDValue &Lo, SDValue &Hi) {
559  EVT LoVT, HiVT;
560  std::tie(LoVT, HiVT) = DAG.GetSplitDestVTs(N->getValueType(0));
561  Lo = DAG.getUNDEF(LoVT);
562  Hi = DAG.getUNDEF(HiVT);
563}
564