1 //===-------- LegalizeTypesGeneric.cpp - Generic type legalization --------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements 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.
20 //===----------------------------------------------------------------------===//
22 #include "LegalizeTypes.h"
23 #include "llvm/Target/TargetData.h"
26 //===----------------------------------------------------------------------===//
27 // Generic Result Expansion.
28 //===----------------------------------------------------------------------===//
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.
33 void 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);
39 void 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 DebugLoc dl = N->getDebugLoc();
46 // Handle some special cases efficiently.
47 switch (getTypeAction(InVT)) {
48 case TargetLowering::TypeLegal:
49 case TargetLowering::TypePromoteInteger:
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);
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);
64 case TargetLowering::TypeSplitVector:
65 GetSplitVector(InOp, Lo, Hi);
66 if (TLI.isBigEndian())
68 Lo = DAG.getNode(ISD::BITCAST, dl, NOutVT, Lo);
69 Hi = DAG.getNode(ISD::BITCAST, dl, NOutVT, Hi);
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);
77 case TargetLowering::TypeWidenVector: {
78 assert(!(InVT.getVectorNumElements() & 1) && "Unsupported BITCAST");
79 InOp = GetWidenedVector(InOp);
80 EVT InNVT = EVT::getVectorVT(*DAG.getContext(), InVT.getVectorElementType(),
81 InVT.getVectorNumElements()/2);
82 Lo = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, InNVT, InOp,
83 DAG.getIntPtrConstant(0));
84 Hi = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, InNVT, InOp,
85 DAG.getIntPtrConstant(InNVT.getVectorNumElements()));
86 if (TLI.isBigEndian())
88 Lo = DAG.getNode(ISD::BITCAST, dl, NOutVT, Lo);
89 Hi = DAG.getNode(ISD::BITCAST, dl, NOutVT, Hi);
94 if (InVT.isVector() && OutVT.isInteger()) {
95 // Handle cases like i64 = BITCAST v1i64 on x86, where the operand
96 // is legal but the result is not.
97 EVT NVT = EVT::getVectorVT(*DAG.getContext(), NOutVT, 2);
99 if (isTypeLegal(NVT)) {
100 SDValue CastInOp = DAG.getNode(ISD::BITCAST, dl, NVT, InOp);
101 Lo = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, NOutVT, CastInOp,
102 DAG.getIntPtrConstant(0));
103 Hi = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, NOutVT, CastInOp,
104 DAG.getIntPtrConstant(1));
106 if (TLI.isBigEndian())
113 // Lower the bit-convert to a store/load from the stack.
114 assert(NOutVT.isByteSized() && "Expanded type not byte sized!");
116 // Create the stack frame object. Make sure it is aligned for both
117 // the source and expanded destination types.
119 TLI.getTargetData()->getPrefTypeAlignment(NOutVT.
120 getTypeForEVT(*DAG.getContext()));
121 SDValue StackPtr = DAG.CreateStackTemporary(InVT, Alignment);
122 int SPFI = cast<FrameIndexSDNode>(StackPtr.getNode())->getIndex();
123 MachinePointerInfo PtrInfo = MachinePointerInfo::getFixedStack(SPFI);
125 // Emit a store to the stack slot.
126 SDValue Store = DAG.getStore(DAG.getEntryNode(), dl, InOp, StackPtr, PtrInfo,
129 // Load the first half from the stack slot.
130 Lo = DAG.getLoad(NOutVT, dl, Store, StackPtr, PtrInfo,
131 false, false, false, 0);
133 // Increment the pointer to the other half.
134 unsigned IncrementSize = NOutVT.getSizeInBits() / 8;
135 StackPtr = DAG.getNode(ISD::ADD, dl, StackPtr.getValueType(), StackPtr,
136 DAG.getIntPtrConstant(IncrementSize));
138 // Load the second half from the stack slot.
139 Hi = DAG.getLoad(NOutVT, dl, Store, StackPtr,
140 PtrInfo.getWithOffset(IncrementSize), false,
141 false, false, MinAlign(Alignment, IncrementSize));
143 // Handle endianness of the load.
144 if (TLI.isBigEndian())
148 void DAGTypeLegalizer::ExpandRes_BUILD_PAIR(SDNode *N, SDValue &Lo,
150 // Return the operands.
151 Lo = N->getOperand(0);
152 Hi = N->getOperand(1);
155 void DAGTypeLegalizer::ExpandRes_EXTRACT_ELEMENT(SDNode *N, SDValue &Lo,
157 GetExpandedOp(N->getOperand(0), Lo, Hi);
158 SDValue Part = cast<ConstantSDNode>(N->getOperand(1))->getZExtValue() ?
161 assert(Part.getValueType() == N->getValueType(0) &&
162 "Type twice as big as expanded type not itself expanded!");
164 GetPairElements(Part, Lo, Hi);
167 void DAGTypeLegalizer::ExpandRes_EXTRACT_VECTOR_ELT(SDNode *N, SDValue &Lo,
169 SDValue OldVec = N->getOperand(0);
170 unsigned OldElts = OldVec.getValueType().getVectorNumElements();
171 DebugLoc dl = N->getDebugLoc();
173 // Convert to a vector of the expanded element type, for example
174 // <3 x i64> -> <6 x i32>.
175 EVT OldVT = N->getValueType(0);
176 EVT NewVT = TLI.getTypeToTransformTo(*DAG.getContext(), OldVT);
178 SDValue NewVec = DAG.getNode(ISD::BITCAST, dl,
179 EVT::getVectorVT(*DAG.getContext(),
183 // Extract the elements at 2 * Idx and 2 * Idx + 1 from the new vector.
184 SDValue Idx = N->getOperand(1);
186 // Make sure the type of Idx is big enough to hold the new values.
187 if (Idx.getValueType().bitsLT(TLI.getPointerTy()))
188 Idx = DAG.getNode(ISD::ZERO_EXTEND, dl, TLI.getPointerTy(), Idx);
190 Idx = DAG.getNode(ISD::ADD, dl, Idx.getValueType(), Idx, Idx);
191 Lo = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, NewVT, NewVec, Idx);
193 Idx = DAG.getNode(ISD::ADD, dl, Idx.getValueType(), Idx,
194 DAG.getConstant(1, Idx.getValueType()));
195 Hi = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, NewVT, NewVec, Idx);
197 if (TLI.isBigEndian())
201 void DAGTypeLegalizer::ExpandRes_NormalLoad(SDNode *N, SDValue &Lo,
203 assert(ISD::isNormalLoad(N) && "This routine only for normal loads!");
204 DebugLoc dl = N->getDebugLoc();
206 LoadSDNode *LD = cast<LoadSDNode>(N);
207 EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), LD->getValueType(0));
208 SDValue Chain = LD->getChain();
209 SDValue Ptr = LD->getBasePtr();
210 unsigned Alignment = LD->getAlignment();
211 bool isVolatile = LD->isVolatile();
212 bool isNonTemporal = LD->isNonTemporal();
213 bool isInvariant = LD->isInvariant();
215 assert(NVT.isByteSized() && "Expanded type not byte sized!");
217 Lo = DAG.getLoad(NVT, dl, Chain, Ptr, LD->getPointerInfo(),
218 isVolatile, isNonTemporal, isInvariant, Alignment);
220 // Increment the pointer to the other half.
221 unsigned IncrementSize = NVT.getSizeInBits() / 8;
222 Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr,
223 DAG.getIntPtrConstant(IncrementSize));
224 Hi = DAG.getLoad(NVT, dl, Chain, Ptr,
225 LD->getPointerInfo().getWithOffset(IncrementSize),
226 isVolatile, isNonTemporal, isInvariant,
227 MinAlign(Alignment, IncrementSize));
229 // Build a factor node to remember that this load is independent of the
231 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Lo.getValue(1),
234 // Handle endianness of the load.
235 if (TLI.isBigEndian())
238 // Modified the chain - switch anything that used the old chain to use
240 ReplaceValueWith(SDValue(N, 1), Chain);
243 void DAGTypeLegalizer::ExpandRes_VAARG(SDNode *N, SDValue &Lo, SDValue &Hi) {
244 EVT OVT = N->getValueType(0);
245 EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), OVT);
246 SDValue Chain = N->getOperand(0);
247 SDValue Ptr = N->getOperand(1);
248 DebugLoc dl = N->getDebugLoc();
249 const unsigned Align = N->getConstantOperandVal(3);
251 Lo = DAG.getVAArg(NVT, dl, Chain, Ptr, N->getOperand(2), Align);
252 Hi = DAG.getVAArg(NVT, dl, Lo.getValue(1), Ptr, N->getOperand(2), 0);
254 // Handle endianness of the load.
255 if (TLI.isBigEndian())
258 // Modified the chain - switch anything that used the old chain to use
260 ReplaceValueWith(SDValue(N, 1), Hi.getValue(1));
264 //===--------------------------------------------------------------------===//
265 // Generic Operand Expansion.
266 //===--------------------------------------------------------------------===//
268 SDValue DAGTypeLegalizer::ExpandOp_BITCAST(SDNode *N) {
269 DebugLoc dl = N->getDebugLoc();
270 if (N->getValueType(0).isVector()) {
271 // An illegal expanding type is being converted to a legal vector type.
272 // Make a two element vector out of the expanded parts and convert that
273 // instead, but only if the new vector type is legal (otherwise there
274 // is no point, and it might create expansion loops). For example, on
275 // x86 this turns v1i64 = BITCAST i64 into v1i64 = BITCAST v2i32.
276 EVT OVT = N->getOperand(0).getValueType();
277 EVT NVT = EVT::getVectorVT(*DAG.getContext(),
278 TLI.getTypeToTransformTo(*DAG.getContext(), OVT),
281 if (isTypeLegal(NVT)) {
283 GetExpandedOp(N->getOperand(0), Parts[0], Parts[1]);
285 if (TLI.isBigEndian())
286 std::swap(Parts[0], Parts[1]);
288 SDValue Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, NVT, Parts, 2);
289 return DAG.getNode(ISD::BITCAST, dl, N->getValueType(0), Vec);
293 // Otherwise, store to a temporary and load out again as the new type.
294 return CreateStackStoreLoad(N->getOperand(0), N->getValueType(0));
297 SDValue DAGTypeLegalizer::ExpandOp_BUILD_VECTOR(SDNode *N) {
298 // The vector type is legal but the element type needs expansion.
299 EVT VecVT = N->getValueType(0);
300 unsigned NumElts = VecVT.getVectorNumElements();
301 EVT OldVT = N->getOperand(0).getValueType();
302 EVT NewVT = TLI.getTypeToTransformTo(*DAG.getContext(), OldVT);
303 DebugLoc dl = N->getDebugLoc();
305 assert(OldVT == VecVT.getVectorElementType() &&
306 "BUILD_VECTOR operand type doesn't match vector element type!");
308 // Build a vector of twice the length out of the expanded elements.
309 // For example <3 x i64> -> <6 x i32>.
310 std::vector<SDValue> NewElts;
311 NewElts.reserve(NumElts*2);
313 for (unsigned i = 0; i < NumElts; ++i) {
315 GetExpandedOp(N->getOperand(i), Lo, Hi);
316 if (TLI.isBigEndian())
318 NewElts.push_back(Lo);
319 NewElts.push_back(Hi);
322 SDValue NewVec = DAG.getNode(ISD::BUILD_VECTOR, dl,
323 EVT::getVectorVT(*DAG.getContext(),
324 NewVT, NewElts.size()),
325 &NewElts[0], NewElts.size());
327 // Convert the new vector to the old vector type.
328 return DAG.getNode(ISD::BITCAST, dl, VecVT, NewVec);
331 SDValue DAGTypeLegalizer::ExpandOp_EXTRACT_ELEMENT(SDNode *N) {
333 GetExpandedOp(N->getOperand(0), Lo, Hi);
334 return cast<ConstantSDNode>(N->getOperand(1))->getZExtValue() ? Hi : Lo;
337 SDValue DAGTypeLegalizer::ExpandOp_INSERT_VECTOR_ELT(SDNode *N) {
338 // The vector type is legal but the element type needs expansion.
339 EVT VecVT = N->getValueType(0);
340 unsigned NumElts = VecVT.getVectorNumElements();
341 DebugLoc dl = N->getDebugLoc();
343 SDValue Val = N->getOperand(1);
344 EVT OldEVT = Val.getValueType();
345 EVT NewEVT = TLI.getTypeToTransformTo(*DAG.getContext(), OldEVT);
347 assert(OldEVT == VecVT.getVectorElementType() &&
348 "Inserted element type doesn't match vector element type!");
350 // Bitconvert to a vector of twice the length with elements of the expanded
351 // type, insert the expanded vector elements, and then convert back.
352 EVT NewVecVT = EVT::getVectorVT(*DAG.getContext(), NewEVT, NumElts*2);
353 SDValue NewVec = DAG.getNode(ISD::BITCAST, dl,
354 NewVecVT, N->getOperand(0));
357 GetExpandedOp(Val, Lo, Hi);
358 if (TLI.isBigEndian())
361 SDValue Idx = N->getOperand(2);
362 Idx = DAG.getNode(ISD::ADD, dl, Idx.getValueType(), Idx, Idx);
363 NewVec = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, NewVecVT, NewVec, Lo, Idx);
364 Idx = DAG.getNode(ISD::ADD, dl,
365 Idx.getValueType(), Idx, DAG.getIntPtrConstant(1));
366 NewVec = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, NewVecVT, NewVec, Hi, Idx);
368 // Convert the new vector to the old vector type.
369 return DAG.getNode(ISD::BITCAST, dl, VecVT, NewVec);
372 SDValue DAGTypeLegalizer::ExpandOp_SCALAR_TO_VECTOR(SDNode *N) {
373 DebugLoc dl = N->getDebugLoc();
374 EVT VT = N->getValueType(0);
375 assert(VT.getVectorElementType() == N->getOperand(0).getValueType() &&
376 "SCALAR_TO_VECTOR operand type doesn't match vector element type!");
377 unsigned NumElts = VT.getVectorNumElements();
378 SmallVector<SDValue, 16> Ops(NumElts);
379 Ops[0] = N->getOperand(0);
380 SDValue UndefVal = DAG.getUNDEF(Ops[0].getValueType());
381 for (unsigned i = 1; i < NumElts; ++i)
383 return DAG.getNode(ISD::BUILD_VECTOR, dl, VT, &Ops[0], NumElts);
386 SDValue DAGTypeLegalizer::ExpandOp_NormalStore(SDNode *N, unsigned OpNo) {
387 assert(ISD::isNormalStore(N) && "This routine only for normal stores!");
388 assert(OpNo == 1 && "Can only expand the stored value so far");
389 DebugLoc dl = N->getDebugLoc();
391 StoreSDNode *St = cast<StoreSDNode>(N);
392 EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(),
393 St->getValue().getValueType());
394 SDValue Chain = St->getChain();
395 SDValue Ptr = St->getBasePtr();
396 unsigned Alignment = St->getAlignment();
397 bool isVolatile = St->isVolatile();
398 bool isNonTemporal = St->isNonTemporal();
400 assert(NVT.isByteSized() && "Expanded type not byte sized!");
401 unsigned IncrementSize = NVT.getSizeInBits() / 8;
404 GetExpandedOp(St->getValue(), Lo, Hi);
406 if (TLI.isBigEndian())
409 Lo = DAG.getStore(Chain, dl, Lo, Ptr, St->getPointerInfo(),
410 isVolatile, isNonTemporal, Alignment);
412 Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr,
413 DAG.getIntPtrConstant(IncrementSize));
414 assert(isTypeLegal(Ptr.getValueType()) && "Pointers must be legal!");
415 Hi = DAG.getStore(Chain, dl, Hi, Ptr,
416 St->getPointerInfo().getWithOffset(IncrementSize),
417 isVolatile, isNonTemporal,
418 MinAlign(Alignment, IncrementSize));
420 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Lo, Hi);
424 //===--------------------------------------------------------------------===//
425 // Generic Result Splitting.
426 //===--------------------------------------------------------------------===//
428 // Be careful to make no assumptions about which of Lo/Hi is stored first in
429 // memory (for vectors it is always Lo first followed by Hi in the following
430 // bytes; for integers and floats it is Lo first if and only if the machine is
433 void DAGTypeLegalizer::SplitRes_MERGE_VALUES(SDNode *N, unsigned ResNo,
434 SDValue &Lo, SDValue &Hi) {
435 SDValue Op = DisintegrateMERGE_VALUES(N, ResNo);
436 GetSplitOp(Op, Lo, Hi);
439 void DAGTypeLegalizer::SplitRes_SELECT(SDNode *N, SDValue &Lo,
441 SDValue LL, LH, RL, RH, CL, CH;
442 DebugLoc dl = N->getDebugLoc();
443 GetSplitOp(N->getOperand(1), LL, LH);
444 GetSplitOp(N->getOperand(2), RL, RH);
446 SDValue Cond = N->getOperand(0);
448 if (Cond.getValueType().isVector()) {
449 assert(Cond.getValueType().getVectorElementType() == MVT::i1 &&
450 "Condition legalized before result?");
451 unsigned NumElements = Cond.getValueType().getVectorNumElements();
452 EVT VCondTy = EVT::getVectorVT(*DAG.getContext(), MVT::i1, NumElements / 2);
453 CL = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, VCondTy, Cond,
454 DAG.getIntPtrConstant(0));
455 CH = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, VCondTy, Cond,
456 DAG.getIntPtrConstant(NumElements / 2));
459 Lo = DAG.getNode(N->getOpcode(), dl, LL.getValueType(), CL, LL, RL);
460 Hi = DAG.getNode(N->getOpcode(), dl, LH.getValueType(), CH, LH, RH);
463 void DAGTypeLegalizer::SplitRes_SELECT_CC(SDNode *N, SDValue &Lo,
465 SDValue LL, LH, RL, RH;
466 DebugLoc dl = N->getDebugLoc();
467 GetSplitOp(N->getOperand(2), LL, LH);
468 GetSplitOp(N->getOperand(3), RL, RH);
470 Lo = DAG.getNode(ISD::SELECT_CC, dl, LL.getValueType(), N->getOperand(0),
471 N->getOperand(1), LL, RL, N->getOperand(4));
472 Hi = DAG.getNode(ISD::SELECT_CC, dl, LH.getValueType(), N->getOperand(0),
473 N->getOperand(1), LH, RH, N->getOperand(4));
476 void DAGTypeLegalizer::SplitRes_UNDEF(SDNode *N, SDValue &Lo, SDValue &Hi) {
478 GetSplitDestVTs(N->getValueType(0), LoVT, HiVT);
479 Lo = DAG.getUNDEF(LoVT);
480 Hi = DAG.getUNDEF(HiVT);