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