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