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::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 
ExpandRes_BUILD_PAIR(SDNode * N,SDValue & Lo,SDValue & Hi)196 void 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 
ExpandRes_EXTRACT_ELEMENT(SDNode * N,SDValue & Lo,SDValue & Hi)203 void 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 
ExpandRes_EXTRACT_VECTOR_ELT(SDNode * N,SDValue & Lo,SDValue & Hi)215 void 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 
ExpandRes_NormalLoad(SDNode * N,SDValue & Lo,SDValue & Hi)255 void 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 
ExpandRes_VAARG(SDNode * N,SDValue & Lo,SDValue & Hi)300 void 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 
IntegerToVector(SDValue Op,unsigned NumElements,SmallVectorImpl<SDValue> & Ops,EVT EltVT)325 void 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 
ExpandOp_BITCAST(SDNode * N)344 SDValue 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 
ExpandOp_BUILD_VECTOR(SDNode * N)380 SDValue 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 
ExpandOp_EXTRACT_ELEMENT(SDNode * N)414 SDValue 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 
ExpandOp_INSERT_VECTOR_ELT(SDNode * N)420 SDValue 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 
ExpandOp_SCALAR_TO_VECTOR(SDNode * N)456 SDValue 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 
ExpandOp_NormalStore(SDNode * N,unsigned OpNo)470 SDValue 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 
SplitRes_MERGE_VALUES(SDNode * N,unsigned ResNo,SDValue & Lo,SDValue & Hi)517 void 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 
SplitRes_SELECT(SDNode * N,SDValue & Lo,SDValue & Hi)523 void 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 
SplitRes_SELECT_CC(SDNode * N,SDValue & Lo,SDValue & Hi)545 void 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 
SplitRes_UNDEF(SDNode * N,SDValue & Lo,SDValue & Hi)558 void 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