1 //===----- LegalizeIntegerTypes.cpp - Legalization of integer types -------===//
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 integer type expansion and promotion for LegalizeTypes.
11 // Promotion is the act of changing a computation in an illegal type into a
12 // computation in a larger type. For example, implementing i8 arithmetic in an
13 // i32 register (often needed on powerpc).
14 // Expansion is the act of changing a computation in an illegal type into a
15 // computation in two identical registers of a smaller type. For example,
16 // implementing i64 arithmetic in two i32 registers (often needed on 32-bit
19 //===----------------------------------------------------------------------===//
21 #include "LegalizeTypes.h"
22 #include "llvm/CodeGen/PseudoSourceValue.h"
23 #include "llvm/Support/ErrorHandling.h"
24 #include "llvm/Support/raw_ostream.h"
27 //===----------------------------------------------------------------------===//
28 // Integer Result Promotion
29 //===----------------------------------------------------------------------===//
31 /// PromoteIntegerResult - This method is called when a result of a node is
32 /// found to be in need of promotion to a larger type. At this point, the node
33 /// may also have invalid operands or may have other results that need
34 /// expansion, we just know that (at least) one result needs promotion.
35 void DAGTypeLegalizer::PromoteIntegerResult(SDNode *N, unsigned ResNo) {
36 DEBUG(dbgs() << "Promote integer result: "; N->dump(&DAG); dbgs() << "\n");
37 SDValue Res = SDValue();
39 // See if the target wants to custom expand this node.
40 if (CustomLowerNode(N, N->getValueType(ResNo), true))
43 switch (N->getOpcode()) {
46 dbgs() << "PromoteIntegerResult #" << ResNo << ": ";
47 N->dump(&DAG); dbgs() << "\n";
49 llvm_unreachable("Do not know how to promote this operator!");
50 case ISD::AssertSext: Res = PromoteIntRes_AssertSext(N); break;
51 case ISD::AssertZext: Res = PromoteIntRes_AssertZext(N); break;
52 case ISD::BITCAST: Res = PromoteIntRes_BITCAST(N); break;
53 case ISD::BSWAP: Res = PromoteIntRes_BSWAP(N); break;
54 case ISD::BUILD_PAIR: Res = PromoteIntRes_BUILD_PAIR(N); break;
55 case ISD::Constant: Res = PromoteIntRes_Constant(N); break;
56 case ISD::CONVERT_RNDSAT:
57 Res = PromoteIntRes_CONVERT_RNDSAT(N); break;
58 case ISD::CTLZ: Res = PromoteIntRes_CTLZ(N); break;
59 case ISD::CTPOP: Res = PromoteIntRes_CTPOP(N); break;
60 case ISD::CTTZ: Res = PromoteIntRes_CTTZ(N); break;
61 case ISD::EXTRACT_VECTOR_ELT:
62 Res = PromoteIntRes_EXTRACT_VECTOR_ELT(N); break;
63 case ISD::LOAD: Res = PromoteIntRes_LOAD(cast<LoadSDNode>(N));break;
64 case ISD::SELECT: Res = PromoteIntRes_SELECT(N); break;
65 case ISD::SELECT_CC: Res = PromoteIntRes_SELECT_CC(N); break;
66 case ISD::SETCC: Res = PromoteIntRes_SETCC(N); break;
67 case ISD::SHL: Res = PromoteIntRes_SHL(N); break;
68 case ISD::SIGN_EXTEND_INREG:
69 Res = PromoteIntRes_SIGN_EXTEND_INREG(N); break;
70 case ISD::SRA: Res = PromoteIntRes_SRA(N); break;
71 case ISD::SRL: Res = PromoteIntRes_SRL(N); break;
72 case ISD::TRUNCATE: Res = PromoteIntRes_TRUNCATE(N); break;
73 case ISD::UNDEF: Res = PromoteIntRes_UNDEF(N); break;
74 case ISD::VAARG: Res = PromoteIntRes_VAARG(N); break;
76 case ISD::SIGN_EXTEND:
77 case ISD::ZERO_EXTEND:
78 case ISD::ANY_EXTEND: Res = PromoteIntRes_INT_EXTEND(N); break;
81 case ISD::FP_TO_UINT: Res = PromoteIntRes_FP_TO_XINT(N); break;
83 case ISD::FP32_TO_FP16:Res = PromoteIntRes_FP32_TO_FP16(N); break;
90 case ISD::MUL: Res = PromoteIntRes_SimpleIntBinOp(N); break;
93 case ISD::SREM: Res = PromoteIntRes_SDIV(N); break;
96 case ISD::UREM: Res = PromoteIntRes_UDIV(N); break;
99 case ISD::SSUBO: Res = PromoteIntRes_SADDSUBO(N, ResNo); break;
101 case ISD::USUBO: Res = PromoteIntRes_UADDSUBO(N, ResNo); break;
103 case ISD::UMULO: Res = PromoteIntRes_XMULO(N, ResNo); break;
105 case ISD::ATOMIC_LOAD_ADD:
106 case ISD::ATOMIC_LOAD_SUB:
107 case ISD::ATOMIC_LOAD_AND:
108 case ISD::ATOMIC_LOAD_OR:
109 case ISD::ATOMIC_LOAD_XOR:
110 case ISD::ATOMIC_LOAD_NAND:
111 case ISD::ATOMIC_LOAD_MIN:
112 case ISD::ATOMIC_LOAD_MAX:
113 case ISD::ATOMIC_LOAD_UMIN:
114 case ISD::ATOMIC_LOAD_UMAX:
115 case ISD::ATOMIC_SWAP:
116 Res = PromoteIntRes_Atomic1(cast<AtomicSDNode>(N)); break;
118 case ISD::ATOMIC_CMP_SWAP:
119 Res = PromoteIntRes_Atomic2(cast<AtomicSDNode>(N)); break;
122 // If the result is null then the sub-method took care of registering it.
124 SetPromotedInteger(SDValue(N, ResNo), Res);
127 SDValue DAGTypeLegalizer::PromoteIntRes_AssertSext(SDNode *N) {
128 // Sign-extend the new bits, and continue the assertion.
129 SDValue Op = SExtPromotedInteger(N->getOperand(0));
130 return DAG.getNode(ISD::AssertSext, N->getDebugLoc(),
131 Op.getValueType(), Op, N->getOperand(1));
134 SDValue DAGTypeLegalizer::PromoteIntRes_AssertZext(SDNode *N) {
135 // Zero the new bits, and continue the assertion.
136 SDValue Op = ZExtPromotedInteger(N->getOperand(0));
137 return DAG.getNode(ISD::AssertZext, N->getDebugLoc(),
138 Op.getValueType(), Op, N->getOperand(1));
141 SDValue DAGTypeLegalizer::PromoteIntRes_Atomic1(AtomicSDNode *N) {
142 SDValue Op2 = GetPromotedInteger(N->getOperand(2));
143 SDValue Res = DAG.getAtomic(N->getOpcode(), N->getDebugLoc(),
145 N->getChain(), N->getBasePtr(),
146 Op2, N->getMemOperand());
147 // Legalized the chain result - switch anything that used the old chain to
149 ReplaceValueWith(SDValue(N, 1), Res.getValue(1));
153 SDValue DAGTypeLegalizer::PromoteIntRes_Atomic2(AtomicSDNode *N) {
154 SDValue Op2 = GetPromotedInteger(N->getOperand(2));
155 SDValue Op3 = GetPromotedInteger(N->getOperand(3));
156 SDValue Res = DAG.getAtomic(N->getOpcode(), N->getDebugLoc(),
157 N->getMemoryVT(), N->getChain(), N->getBasePtr(),
158 Op2, Op3, N->getMemOperand());
159 // Legalized the chain result - switch anything that used the old chain to
161 ReplaceValueWith(SDValue(N, 1), Res.getValue(1));
165 SDValue DAGTypeLegalizer::PromoteIntRes_BITCAST(SDNode *N) {
166 SDValue InOp = N->getOperand(0);
167 EVT InVT = InOp.getValueType();
168 EVT NInVT = TLI.getTypeToTransformTo(*DAG.getContext(), InVT);
169 EVT OutVT = N->getValueType(0);
170 EVT NOutVT = TLI.getTypeToTransformTo(*DAG.getContext(), OutVT);
171 DebugLoc dl = N->getDebugLoc();
173 switch (getTypeAction(InVT)) {
175 assert(false && "Unknown type action!");
180 if (NOutVT.bitsEq(NInVT))
181 // The input promotes to the same size. Convert the promoted value.
182 return DAG.getNode(ISD::BITCAST, dl, NOutVT, GetPromotedInteger(InOp));
185 // Promote the integer operand by hand.
186 return DAG.getNode(ISD::ANY_EXTEND, dl, NOutVT, GetSoftenedFloat(InOp));
190 case ScalarizeVector:
191 // Convert the element to an integer and promote it by hand.
192 return DAG.getNode(ISD::ANY_EXTEND, dl, NOutVT,
193 BitConvertToInteger(GetScalarizedVector(InOp)));
195 // For example, i32 = BITCAST v2i16 on alpha. Convert the split
196 // pieces of the input into integers and reassemble in the final type.
198 GetSplitVector(N->getOperand(0), Lo, Hi);
199 Lo = BitConvertToInteger(Lo);
200 Hi = BitConvertToInteger(Hi);
202 if (TLI.isBigEndian())
205 InOp = DAG.getNode(ISD::ANY_EXTEND, dl,
206 EVT::getIntegerVT(*DAG.getContext(),
207 NOutVT.getSizeInBits()),
208 JoinIntegers(Lo, Hi));
209 return DAG.getNode(ISD::BITCAST, dl, NOutVT, InOp);
212 if (OutVT.bitsEq(NInVT))
213 // The input is widened to the same size. Convert to the widened value.
214 return DAG.getNode(ISD::BITCAST, dl, OutVT, GetWidenedVector(InOp));
217 return DAG.getNode(ISD::ANY_EXTEND, dl, NOutVT,
218 CreateStackStoreLoad(InOp, OutVT));
221 SDValue DAGTypeLegalizer::PromoteIntRes_BSWAP(SDNode *N) {
222 SDValue Op = GetPromotedInteger(N->getOperand(0));
223 EVT OVT = N->getValueType(0);
224 EVT NVT = Op.getValueType();
225 DebugLoc dl = N->getDebugLoc();
227 unsigned DiffBits = NVT.getSizeInBits() - OVT.getSizeInBits();
228 return DAG.getNode(ISD::SRL, dl, NVT, DAG.getNode(ISD::BSWAP, dl, NVT, Op),
229 DAG.getConstant(DiffBits, TLI.getPointerTy()));
232 SDValue DAGTypeLegalizer::PromoteIntRes_BUILD_PAIR(SDNode *N) {
233 // The pair element type may be legal, or may not promote to the same type as
234 // the result, for example i14 = BUILD_PAIR (i7, i7). Handle all cases.
235 return DAG.getNode(ISD::ANY_EXTEND, N->getDebugLoc(),
236 TLI.getTypeToTransformTo(*DAG.getContext(),
237 N->getValueType(0)), JoinIntegers(N->getOperand(0),
241 SDValue DAGTypeLegalizer::PromoteIntRes_Constant(SDNode *N) {
242 EVT VT = N->getValueType(0);
243 // FIXME there is no actual debug info here
244 DebugLoc dl = N->getDebugLoc();
245 // Zero extend things like i1, sign extend everything else. It shouldn't
246 // matter in theory which one we pick, but this tends to give better code?
247 unsigned Opc = VT.isByteSized() ? ISD::SIGN_EXTEND : ISD::ZERO_EXTEND;
248 SDValue Result = DAG.getNode(Opc, dl,
249 TLI.getTypeToTransformTo(*DAG.getContext(), VT),
251 assert(isa<ConstantSDNode>(Result) && "Didn't constant fold ext?");
255 SDValue DAGTypeLegalizer::PromoteIntRes_CONVERT_RNDSAT(SDNode *N) {
256 ISD::CvtCode CvtCode = cast<CvtRndSatSDNode>(N)->getCvtCode();
257 assert ((CvtCode == ISD::CVT_SS || CvtCode == ISD::CVT_SU ||
258 CvtCode == ISD::CVT_US || CvtCode == ISD::CVT_UU ||
259 CvtCode == ISD::CVT_SF || CvtCode == ISD::CVT_UF) &&
260 "can only promote integers");
261 EVT OutVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
262 return DAG.getConvertRndSat(OutVT, N->getDebugLoc(), N->getOperand(0),
263 N->getOperand(1), N->getOperand(2),
264 N->getOperand(3), N->getOperand(4), CvtCode);
267 SDValue DAGTypeLegalizer::PromoteIntRes_CTLZ(SDNode *N) {
268 // Zero extend to the promoted type and do the count there.
269 SDValue Op = ZExtPromotedInteger(N->getOperand(0));
270 DebugLoc dl = N->getDebugLoc();
271 EVT OVT = N->getValueType(0);
272 EVT NVT = Op.getValueType();
273 Op = DAG.getNode(ISD::CTLZ, dl, NVT, Op);
274 // Subtract off the extra leading bits in the bigger type.
275 return DAG.getNode(ISD::SUB, dl, NVT, Op,
276 DAG.getConstant(NVT.getSizeInBits() -
277 OVT.getSizeInBits(), NVT));
280 SDValue DAGTypeLegalizer::PromoteIntRes_CTPOP(SDNode *N) {
281 // Zero extend to the promoted type and do the count there.
282 SDValue Op = ZExtPromotedInteger(N->getOperand(0));
283 return DAG.getNode(ISD::CTPOP, N->getDebugLoc(), Op.getValueType(), Op);
286 SDValue DAGTypeLegalizer::PromoteIntRes_CTTZ(SDNode *N) {
287 SDValue Op = GetPromotedInteger(N->getOperand(0));
288 EVT OVT = N->getValueType(0);
289 EVT NVT = Op.getValueType();
290 DebugLoc dl = N->getDebugLoc();
291 // The count is the same in the promoted type except if the original
292 // value was zero. This can be handled by setting the bit just off
293 // the top of the original type.
294 APInt TopBit(NVT.getSizeInBits(), 0);
295 TopBit.setBit(OVT.getSizeInBits());
296 Op = DAG.getNode(ISD::OR, dl, NVT, Op, DAG.getConstant(TopBit, NVT));
297 return DAG.getNode(ISD::CTTZ, dl, NVT, Op);
300 SDValue DAGTypeLegalizer::PromoteIntRes_EXTRACT_VECTOR_ELT(SDNode *N) {
301 DebugLoc dl = N->getDebugLoc();
302 EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
303 return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, NVT, N->getOperand(0),
307 SDValue DAGTypeLegalizer::PromoteIntRes_FP_TO_XINT(SDNode *N) {
308 EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
309 unsigned NewOpc = N->getOpcode();
310 DebugLoc dl = N->getDebugLoc();
312 // If we're promoting a UINT to a larger size and the larger FP_TO_UINT is
313 // not Legal, check to see if we can use FP_TO_SINT instead. (If both UINT
314 // and SINT conversions are Custom, there is no way to tell which is
315 // preferable. We choose SINT because that's the right thing on PPC.)
316 if (N->getOpcode() == ISD::FP_TO_UINT &&
317 !TLI.isOperationLegal(ISD::FP_TO_UINT, NVT) &&
318 TLI.isOperationLegalOrCustom(ISD::FP_TO_SINT, NVT))
319 NewOpc = ISD::FP_TO_SINT;
321 SDValue Res = DAG.getNode(NewOpc, dl, NVT, N->getOperand(0));
323 // Assert that the converted value fits in the original type. If it doesn't
324 // (eg: because the value being converted is too big), then the result of the
325 // original operation was undefined anyway, so the assert is still correct.
326 return DAG.getNode(N->getOpcode() == ISD::FP_TO_UINT ?
327 ISD::AssertZext : ISD::AssertSext, dl,
328 NVT, Res, DAG.getValueType(N->getValueType(0)));
331 SDValue DAGTypeLegalizer::PromoteIntRes_FP32_TO_FP16(SDNode *N) {
332 EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
333 DebugLoc dl = N->getDebugLoc();
335 SDValue Res = DAG.getNode(N->getOpcode(), dl, NVT, N->getOperand(0));
337 return DAG.getNode(ISD::AssertZext, dl,
338 NVT, Res, DAG.getValueType(N->getValueType(0)));
341 SDValue DAGTypeLegalizer::PromoteIntRes_INT_EXTEND(SDNode *N) {
342 EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
343 DebugLoc dl = N->getDebugLoc();
345 if (getTypeAction(N->getOperand(0).getValueType()) == PromoteInteger) {
346 SDValue Res = GetPromotedInteger(N->getOperand(0));
347 assert(Res.getValueType().bitsLE(NVT) && "Extension doesn't make sense!");
349 // If the result and operand types are the same after promotion, simplify
350 // to an in-register extension.
351 if (NVT == Res.getValueType()) {
352 // The high bits are not guaranteed to be anything. Insert an extend.
353 if (N->getOpcode() == ISD::SIGN_EXTEND)
354 return DAG.getNode(ISD::SIGN_EXTEND_INREG, dl, NVT, Res,
355 DAG.getValueType(N->getOperand(0).getValueType()));
356 if (N->getOpcode() == ISD::ZERO_EXTEND)
357 return DAG.getZeroExtendInReg(Res, dl, N->getOperand(0).getValueType());
358 assert(N->getOpcode() == ISD::ANY_EXTEND && "Unknown integer extension!");
363 // Otherwise, just extend the original operand all the way to the larger type.
364 return DAG.getNode(N->getOpcode(), dl, NVT, N->getOperand(0));
367 SDValue DAGTypeLegalizer::PromoteIntRes_LOAD(LoadSDNode *N) {
368 assert(ISD::isUNINDEXEDLoad(N) && "Indexed load during type legalization!");
369 EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
370 ISD::LoadExtType ExtType =
371 ISD::isNON_EXTLoad(N) ? ISD::EXTLOAD : N->getExtensionType();
372 DebugLoc dl = N->getDebugLoc();
373 SDValue Res = DAG.getExtLoad(ExtType, NVT, dl, N->getChain(), N->getBasePtr(),
375 N->getMemoryVT(), N->isVolatile(),
376 N->isNonTemporal(), N->getAlignment());
378 // Legalized the chain result - switch anything that used the old chain to
380 ReplaceValueWith(SDValue(N, 1), Res.getValue(1));
384 /// Promote the overflow flag of an overflowing arithmetic node.
385 SDValue DAGTypeLegalizer::PromoteIntRes_Overflow(SDNode *N) {
386 // Simply change the return type of the boolean result.
387 EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(1));
388 EVT ValueVTs[] = { N->getValueType(0), NVT };
389 SDValue Ops[] = { N->getOperand(0), N->getOperand(1) };
390 SDValue Res = DAG.getNode(N->getOpcode(), N->getDebugLoc(),
391 DAG.getVTList(ValueVTs, 2), Ops, 2);
393 // Modified the sum result - switch anything that used the old sum to use
395 ReplaceValueWith(SDValue(N, 0), Res);
397 return SDValue(Res.getNode(), 1);
400 SDValue DAGTypeLegalizer::PromoteIntRes_SADDSUBO(SDNode *N, unsigned ResNo) {
402 return PromoteIntRes_Overflow(N);
404 // The operation overflowed iff the result in the larger type is not the
405 // sign extension of its truncation to the original type.
406 SDValue LHS = SExtPromotedInteger(N->getOperand(0));
407 SDValue RHS = SExtPromotedInteger(N->getOperand(1));
408 EVT OVT = N->getOperand(0).getValueType();
409 EVT NVT = LHS.getValueType();
410 DebugLoc dl = N->getDebugLoc();
412 // Do the arithmetic in the larger type.
413 unsigned Opcode = N->getOpcode() == ISD::SADDO ? ISD::ADD : ISD::SUB;
414 SDValue Res = DAG.getNode(Opcode, dl, NVT, LHS, RHS);
416 // Calculate the overflow flag: sign extend the arithmetic result from
417 // the original type.
418 SDValue Ofl = DAG.getNode(ISD::SIGN_EXTEND_INREG, dl, NVT, Res,
419 DAG.getValueType(OVT));
420 // Overflowed if and only if this is not equal to Res.
421 Ofl = DAG.getSetCC(dl, N->getValueType(1), Ofl, Res, ISD::SETNE);
423 // Use the calculated overflow everywhere.
424 ReplaceValueWith(SDValue(N, 1), Ofl);
429 SDValue DAGTypeLegalizer::PromoteIntRes_SDIV(SDNode *N) {
430 // Sign extend the input.
431 SDValue LHS = SExtPromotedInteger(N->getOperand(0));
432 SDValue RHS = SExtPromotedInteger(N->getOperand(1));
433 return DAG.getNode(N->getOpcode(), N->getDebugLoc(),
434 LHS.getValueType(), LHS, RHS);
437 SDValue DAGTypeLegalizer::PromoteIntRes_SELECT(SDNode *N) {
438 SDValue LHS = GetPromotedInteger(N->getOperand(1));
439 SDValue RHS = GetPromotedInteger(N->getOperand(2));
440 return DAG.getNode(ISD::SELECT, N->getDebugLoc(),
441 LHS.getValueType(), N->getOperand(0),LHS,RHS);
444 SDValue DAGTypeLegalizer::PromoteIntRes_SELECT_CC(SDNode *N) {
445 SDValue LHS = GetPromotedInteger(N->getOperand(2));
446 SDValue RHS = GetPromotedInteger(N->getOperand(3));
447 return DAG.getNode(ISD::SELECT_CC, N->getDebugLoc(),
448 LHS.getValueType(), N->getOperand(0),
449 N->getOperand(1), LHS, RHS, N->getOperand(4));
452 SDValue DAGTypeLegalizer::PromoteIntRes_SETCC(SDNode *N) {
453 EVT SVT = TLI.getSetCCResultType(N->getOperand(0).getValueType());
454 assert(isTypeLegal(SVT) && "Illegal SetCC type!");
455 DebugLoc dl = N->getDebugLoc();
457 // Get the SETCC result using the canonical SETCC type.
458 SDValue SetCC = DAG.getNode(ISD::SETCC, dl, SVT, N->getOperand(0),
459 N->getOperand(1), N->getOperand(2));
461 // Convert to the expected type.
462 EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
463 assert(NVT.bitsLE(SVT) && "Integer type overpromoted?");
464 return DAG.getNode(ISD::TRUNCATE, dl, NVT, SetCC);
467 SDValue DAGTypeLegalizer::PromoteIntRes_SHL(SDNode *N) {
468 return DAG.getNode(ISD::SHL, N->getDebugLoc(),
469 TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0)),
470 GetPromotedInteger(N->getOperand(0)), N->getOperand(1));
473 SDValue DAGTypeLegalizer::PromoteIntRes_SIGN_EXTEND_INREG(SDNode *N) {
474 SDValue Op = GetPromotedInteger(N->getOperand(0));
475 return DAG.getNode(ISD::SIGN_EXTEND_INREG, N->getDebugLoc(),
476 Op.getValueType(), Op, N->getOperand(1));
479 SDValue DAGTypeLegalizer::PromoteIntRes_SimpleIntBinOp(SDNode *N) {
480 // The input may have strange things in the top bits of the registers, but
481 // these operations don't care. They may have weird bits going out, but
482 // that too is okay if they are integer operations.
483 SDValue LHS = GetPromotedInteger(N->getOperand(0));
484 SDValue RHS = GetPromotedInteger(N->getOperand(1));
485 return DAG.getNode(N->getOpcode(), N->getDebugLoc(),
486 LHS.getValueType(), LHS, RHS);
489 SDValue DAGTypeLegalizer::PromoteIntRes_SRA(SDNode *N) {
490 // The input value must be properly sign extended.
491 SDValue Res = SExtPromotedInteger(N->getOperand(0));
492 return DAG.getNode(ISD::SRA, N->getDebugLoc(),
493 Res.getValueType(), Res, N->getOperand(1));
496 SDValue DAGTypeLegalizer::PromoteIntRes_SRL(SDNode *N) {
497 // The input value must be properly zero extended.
498 EVT VT = N->getValueType(0);
499 EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), VT);
500 SDValue Res = ZExtPromotedInteger(N->getOperand(0));
501 return DAG.getNode(ISD::SRL, N->getDebugLoc(), NVT, Res, N->getOperand(1));
504 SDValue DAGTypeLegalizer::PromoteIntRes_TRUNCATE(SDNode *N) {
505 EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
508 switch (getTypeAction(N->getOperand(0).getValueType())) {
509 default: llvm_unreachable("Unknown type action!");
512 Res = N->getOperand(0);
515 Res = GetPromotedInteger(N->getOperand(0));
519 // Truncate to NVT instead of VT
520 return DAG.getNode(ISD::TRUNCATE, N->getDebugLoc(), NVT, Res);
523 SDValue DAGTypeLegalizer::PromoteIntRes_UADDSUBO(SDNode *N, unsigned ResNo) {
525 return PromoteIntRes_Overflow(N);
527 // The operation overflowed iff the result in the larger type is not the
528 // zero extension of its truncation to the original type.
529 SDValue LHS = ZExtPromotedInteger(N->getOperand(0));
530 SDValue RHS = ZExtPromotedInteger(N->getOperand(1));
531 EVT OVT = N->getOperand(0).getValueType();
532 EVT NVT = LHS.getValueType();
533 DebugLoc dl = N->getDebugLoc();
535 // Do the arithmetic in the larger type.
536 unsigned Opcode = N->getOpcode() == ISD::UADDO ? ISD::ADD : ISD::SUB;
537 SDValue Res = DAG.getNode(Opcode, dl, NVT, LHS, RHS);
539 // Calculate the overflow flag: zero extend the arithmetic result from
540 // the original type.
541 SDValue Ofl = DAG.getZeroExtendInReg(Res, dl, OVT);
542 // Overflowed if and only if this is not equal to Res.
543 Ofl = DAG.getSetCC(dl, N->getValueType(1), Ofl, Res, ISD::SETNE);
545 // Use the calculated overflow everywhere.
546 ReplaceValueWith(SDValue(N, 1), Ofl);
552 SDValue DAGTypeLegalizer::PromoteIntRes_XMULO(SDNode *N, unsigned ResNo) {
553 // Promote the overflow bit trivially.
555 return PromoteIntRes_Overflow(N);
557 SDValue LHS = N->getOperand(0), RHS = N->getOperand(1);
558 DebugLoc DL = N->getDebugLoc();
559 unsigned SmallSize = LHS.getValueType().getSizeInBits();
561 // To determine if the result overflowed in a larger type, we extend the input
562 // to the larger type, do the multiply, then check the high bits of the result
563 // to see if the overflow happened.
564 if (N->getOpcode() == ISD::SMULO) {
565 LHS = SExtPromotedInteger(LHS);
566 RHS = SExtPromotedInteger(RHS);
568 LHS = ZExtPromotedInteger(LHS);
569 RHS = ZExtPromotedInteger(RHS);
572 SDValue Mul = DAG.getNode(ISD::MUL, DL, LHS.getValueType(), LHS, RHS);
575 // For an unsigned overflow, we check to see if the high part is != 0;
577 if (N->getOpcode() == ISD::UMULO) {
578 SDValue Hi = DAG.getNode(ISD::SRL, DL, Mul.getValueType(), Mul,
579 DAG.getIntPtrConstant(SmallSize));
580 // Overflowed if and only if this is not equal to Res.
581 Overflow = DAG.getSetCC(DL, N->getValueType(1), Hi,
582 DAG.getConstant(0, Hi.getValueType()), ISD::SETNE);
584 // Signed multiply overflowed if the high part is not 0 and not -1.
585 SDValue Hi = DAG.getNode(ISD::SRA, DL, Mul.getValueType(), Mul,
586 DAG.getIntPtrConstant(SmallSize));
587 Hi = DAG.getNode(ISD::ADD, DL, Hi.getValueType(), Hi,
588 DAG.getConstant(1, Hi.getValueType()));
589 Overflow = DAG.getSetCC(DL, N->getValueType(1), Hi,
590 DAG.getConstant(1, Hi.getValueType()), ISD::SETUGT);
593 // Use the calculated overflow everywhere.
594 ReplaceValueWith(SDValue(N, 1), Overflow);
599 SDValue DAGTypeLegalizer::PromoteIntRes_UDIV(SDNode *N) {
600 // Zero extend the input.
601 SDValue LHS = ZExtPromotedInteger(N->getOperand(0));
602 SDValue RHS = ZExtPromotedInteger(N->getOperand(1));
603 return DAG.getNode(N->getOpcode(), N->getDebugLoc(),
604 LHS.getValueType(), LHS, RHS);
607 SDValue DAGTypeLegalizer::PromoteIntRes_UNDEF(SDNode *N) {
608 return DAG.getUNDEF(TLI.getTypeToTransformTo(*DAG.getContext(),
609 N->getValueType(0)));
612 SDValue DAGTypeLegalizer::PromoteIntRes_VAARG(SDNode *N) {
613 SDValue Chain = N->getOperand(0); // Get the chain.
614 SDValue Ptr = N->getOperand(1); // Get the pointer.
615 EVT VT = N->getValueType(0);
616 DebugLoc dl = N->getDebugLoc();
618 EVT RegVT = TLI.getRegisterType(*DAG.getContext(), VT);
619 unsigned NumRegs = TLI.getNumRegisters(*DAG.getContext(), VT);
620 // The argument is passed as NumRegs registers of type RegVT.
622 SmallVector<SDValue, 8> Parts(NumRegs);
623 for (unsigned i = 0; i < NumRegs; ++i) {
624 Parts[i] = DAG.getVAArg(RegVT, dl, Chain, Ptr, N->getOperand(2),
625 N->getConstantOperandVal(3));
626 Chain = Parts[i].getValue(1);
629 // Handle endianness of the load.
630 if (TLI.isBigEndian())
631 std::reverse(Parts.begin(), Parts.end());
633 // Assemble the parts in the promoted type.
634 EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
635 SDValue Res = DAG.getNode(ISD::ZERO_EXTEND, dl, NVT, Parts[0]);
636 for (unsigned i = 1; i < NumRegs; ++i) {
637 SDValue Part = DAG.getNode(ISD::ZERO_EXTEND, dl, NVT, Parts[i]);
638 // Shift it to the right position and "or" it in.
639 Part = DAG.getNode(ISD::SHL, dl, NVT, Part,
640 DAG.getConstant(i * RegVT.getSizeInBits(),
641 TLI.getPointerTy()));
642 Res = DAG.getNode(ISD::OR, dl, NVT, Res, Part);
645 // Modified the chain result - switch anything that used the old chain to
647 ReplaceValueWith(SDValue(N, 1), Chain);
652 //===----------------------------------------------------------------------===//
653 // Integer Operand Promotion
654 //===----------------------------------------------------------------------===//
656 /// PromoteIntegerOperand - This method is called when the specified operand of
657 /// the specified node is found to need promotion. At this point, all of the
658 /// result types of the node are known to be legal, but other operands of the
659 /// node may need promotion or expansion as well as the specified one.
660 bool DAGTypeLegalizer::PromoteIntegerOperand(SDNode *N, unsigned OpNo) {
661 DEBUG(dbgs() << "Promote integer operand: "; N->dump(&DAG); dbgs() << "\n");
662 SDValue Res = SDValue();
664 if (CustomLowerNode(N, N->getOperand(OpNo).getValueType(), false))
667 switch (N->getOpcode()) {
670 dbgs() << "PromoteIntegerOperand Op #" << OpNo << ": ";
671 N->dump(&DAG); dbgs() << "\n";
673 llvm_unreachable("Do not know how to promote this operator's operand!");
675 case ISD::ANY_EXTEND: Res = PromoteIntOp_ANY_EXTEND(N); break;
676 case ISD::BITCAST: Res = PromoteIntOp_BITCAST(N); break;
677 case ISD::BR_CC: Res = PromoteIntOp_BR_CC(N, OpNo); break;
678 case ISD::BRCOND: Res = PromoteIntOp_BRCOND(N, OpNo); break;
679 case ISD::BUILD_PAIR: Res = PromoteIntOp_BUILD_PAIR(N); break;
680 case ISD::BUILD_VECTOR: Res = PromoteIntOp_BUILD_VECTOR(N); break;
681 case ISD::CONVERT_RNDSAT:
682 Res = PromoteIntOp_CONVERT_RNDSAT(N); break;
683 case ISD::INSERT_VECTOR_ELT:
684 Res = PromoteIntOp_INSERT_VECTOR_ELT(N, OpNo);break;
685 case ISD::MEMBARRIER: Res = PromoteIntOp_MEMBARRIER(N); break;
686 case ISD::SCALAR_TO_VECTOR:
687 Res = PromoteIntOp_SCALAR_TO_VECTOR(N); break;
688 case ISD::SELECT: Res = PromoteIntOp_SELECT(N, OpNo); break;
689 case ISD::SELECT_CC: Res = PromoteIntOp_SELECT_CC(N, OpNo); break;
690 case ISD::SETCC: Res = PromoteIntOp_SETCC(N, OpNo); break;
691 case ISD::SIGN_EXTEND: Res = PromoteIntOp_SIGN_EXTEND(N); break;
692 case ISD::SINT_TO_FP: Res = PromoteIntOp_SINT_TO_FP(N); break;
693 case ISD::STORE: Res = PromoteIntOp_STORE(cast<StoreSDNode>(N),
695 case ISD::TRUNCATE: Res = PromoteIntOp_TRUNCATE(N); break;
696 case ISD::FP16_TO_FP32:
697 case ISD::UINT_TO_FP: Res = PromoteIntOp_UINT_TO_FP(N); break;
698 case ISD::ZERO_EXTEND: Res = PromoteIntOp_ZERO_EXTEND(N); break;
704 case ISD::ROTR: Res = PromoteIntOp_Shift(N); break;
707 // If the result is null, the sub-method took care of registering results etc.
708 if (!Res.getNode()) return false;
710 // If the result is N, the sub-method updated N in place. Tell the legalizer
712 if (Res.getNode() == N)
715 assert(Res.getValueType() == N->getValueType(0) && N->getNumValues() == 1 &&
716 "Invalid operand expansion");
718 ReplaceValueWith(SDValue(N, 0), Res);
722 /// PromoteSetCCOperands - Promote the operands of a comparison. This code is
723 /// shared among BR_CC, SELECT_CC, and SETCC handlers.
724 void DAGTypeLegalizer::PromoteSetCCOperands(SDValue &NewLHS,SDValue &NewRHS,
725 ISD::CondCode CCCode) {
726 // We have to insert explicit sign or zero extends. Note that we could
727 // insert sign extends for ALL conditions, but zero extend is cheaper on
728 // many machines (an AND instead of two shifts), so prefer it.
730 default: llvm_unreachable("Unknown integer comparison!");
737 // ALL of these operations will work if we either sign or zero extend
738 // the operands (including the unsigned comparisons!). Zero extend is
739 // usually a simpler/cheaper operation, so prefer it.
740 NewLHS = ZExtPromotedInteger(NewLHS);
741 NewRHS = ZExtPromotedInteger(NewRHS);
747 NewLHS = SExtPromotedInteger(NewLHS);
748 NewRHS = SExtPromotedInteger(NewRHS);
753 SDValue DAGTypeLegalizer::PromoteIntOp_ANY_EXTEND(SDNode *N) {
754 SDValue Op = GetPromotedInteger(N->getOperand(0));
755 return DAG.getNode(ISD::ANY_EXTEND, N->getDebugLoc(), N->getValueType(0), Op);
758 SDValue DAGTypeLegalizer::PromoteIntOp_BITCAST(SDNode *N) {
759 // This should only occur in unusual situations like bitcasting to an
760 // x86_fp80, so just turn it into a store+load
761 return CreateStackStoreLoad(N->getOperand(0), N->getValueType(0));
764 SDValue DAGTypeLegalizer::PromoteIntOp_BR_CC(SDNode *N, unsigned OpNo) {
765 assert(OpNo == 2 && "Don't know how to promote this operand!");
767 SDValue LHS = N->getOperand(2);
768 SDValue RHS = N->getOperand(3);
769 PromoteSetCCOperands(LHS, RHS, cast<CondCodeSDNode>(N->getOperand(1))->get());
771 // The chain (Op#0), CC (#1) and basic block destination (Op#4) are always
773 return SDValue(DAG.UpdateNodeOperands(N, N->getOperand(0),
774 N->getOperand(1), LHS, RHS, N->getOperand(4)),
778 SDValue DAGTypeLegalizer::PromoteIntOp_BRCOND(SDNode *N, unsigned OpNo) {
779 assert(OpNo == 1 && "only know how to promote condition");
781 // Promote all the way up to the canonical SetCC type.
782 EVT SVT = TLI.getSetCCResultType(MVT::Other);
783 SDValue Cond = PromoteTargetBoolean(N->getOperand(1), SVT);
785 // The chain (Op#0) and basic block destination (Op#2) are always legal types.
786 return SDValue(DAG.UpdateNodeOperands(N, N->getOperand(0), Cond,
787 N->getOperand(2)), 0);
790 SDValue DAGTypeLegalizer::PromoteIntOp_BUILD_PAIR(SDNode *N) {
791 // Since the result type is legal, the operands must promote to it.
792 EVT OVT = N->getOperand(0).getValueType();
793 SDValue Lo = ZExtPromotedInteger(N->getOperand(0));
794 SDValue Hi = GetPromotedInteger(N->getOperand(1));
795 assert(Lo.getValueType() == N->getValueType(0) && "Operand over promoted?");
796 DebugLoc dl = N->getDebugLoc();
798 Hi = DAG.getNode(ISD::SHL, dl, N->getValueType(0), Hi,
799 DAG.getConstant(OVT.getSizeInBits(), TLI.getPointerTy()));
800 return DAG.getNode(ISD::OR, dl, N->getValueType(0), Lo, Hi);
803 SDValue DAGTypeLegalizer::PromoteIntOp_BUILD_VECTOR(SDNode *N) {
804 // The vector type is legal but the element type is not. This implies
805 // that the vector is a power-of-two in length and that the element
806 // type does not have a strange size (eg: it is not i1).
807 EVT VecVT = N->getValueType(0);
808 unsigned NumElts = VecVT.getVectorNumElements();
809 assert(!(NumElts & 1) && "Legal vector of one illegal element?");
811 // Promote the inserted value. The type does not need to match the
812 // vector element type. Check that any extra bits introduced will be
814 assert(N->getOperand(0).getValueType().getSizeInBits() >=
815 N->getValueType(0).getVectorElementType().getSizeInBits() &&
816 "Type of inserted value narrower than vector element type!");
818 SmallVector<SDValue, 16> NewOps;
819 for (unsigned i = 0; i < NumElts; ++i)
820 NewOps.push_back(GetPromotedInteger(N->getOperand(i)));
822 return SDValue(DAG.UpdateNodeOperands(N, &NewOps[0], NumElts), 0);
825 SDValue DAGTypeLegalizer::PromoteIntOp_CONVERT_RNDSAT(SDNode *N) {
826 ISD::CvtCode CvtCode = cast<CvtRndSatSDNode>(N)->getCvtCode();
827 assert ((CvtCode == ISD::CVT_SS || CvtCode == ISD::CVT_SU ||
828 CvtCode == ISD::CVT_US || CvtCode == ISD::CVT_UU ||
829 CvtCode == ISD::CVT_FS || CvtCode == ISD::CVT_FU) &&
830 "can only promote integer arguments");
831 SDValue InOp = GetPromotedInteger(N->getOperand(0));
832 return DAG.getConvertRndSat(N->getValueType(0), N->getDebugLoc(), InOp,
833 N->getOperand(1), N->getOperand(2),
834 N->getOperand(3), N->getOperand(4), CvtCode);
837 SDValue DAGTypeLegalizer::PromoteIntOp_INSERT_VECTOR_ELT(SDNode *N,
840 // Promote the inserted value. This is valid because the type does not
841 // have to match the vector element type.
843 // Check that any extra bits introduced will be truncated away.
844 assert(N->getOperand(1).getValueType().getSizeInBits() >=
845 N->getValueType(0).getVectorElementType().getSizeInBits() &&
846 "Type of inserted value narrower than vector element type!");
847 return SDValue(DAG.UpdateNodeOperands(N, N->getOperand(0),
848 GetPromotedInteger(N->getOperand(1)),
853 assert(OpNo == 2 && "Different operand and result vector types?");
855 // Promote the index.
856 SDValue Idx = ZExtPromotedInteger(N->getOperand(2));
857 return SDValue(DAG.UpdateNodeOperands(N, N->getOperand(0),
858 N->getOperand(1), Idx), 0);
861 SDValue DAGTypeLegalizer::PromoteIntOp_MEMBARRIER(SDNode *N) {
863 DebugLoc dl = N->getDebugLoc();
864 NewOps[0] = N->getOperand(0);
865 for (unsigned i = 1; i < array_lengthof(NewOps); ++i) {
866 SDValue Flag = GetPromotedInteger(N->getOperand(i));
867 NewOps[i] = DAG.getZeroExtendInReg(Flag, dl, MVT::i1);
869 return SDValue(DAG.UpdateNodeOperands(N, NewOps, array_lengthof(NewOps)), 0);
872 SDValue DAGTypeLegalizer::PromoteIntOp_SCALAR_TO_VECTOR(SDNode *N) {
873 // Integer SCALAR_TO_VECTOR operands are implicitly truncated, so just promote
874 // the operand in place.
875 return SDValue(DAG.UpdateNodeOperands(N,
876 GetPromotedInteger(N->getOperand(0))), 0);
879 SDValue DAGTypeLegalizer::PromoteIntOp_SELECT(SDNode *N, unsigned OpNo) {
880 assert(OpNo == 0 && "Only know how to promote condition");
882 // Promote all the way up to the canonical SetCC type.
883 EVT SVT = TLI.getSetCCResultType(N->getOperand(1).getValueType());
884 SDValue Cond = PromoteTargetBoolean(N->getOperand(0), SVT);
886 return SDValue(DAG.UpdateNodeOperands(N, Cond,
887 N->getOperand(1), N->getOperand(2)), 0);
890 SDValue DAGTypeLegalizer::PromoteIntOp_SELECT_CC(SDNode *N, unsigned OpNo) {
891 assert(OpNo == 0 && "Don't know how to promote this operand!");
893 SDValue LHS = N->getOperand(0);
894 SDValue RHS = N->getOperand(1);
895 PromoteSetCCOperands(LHS, RHS, cast<CondCodeSDNode>(N->getOperand(4))->get());
897 // The CC (#4) and the possible return values (#2 and #3) have legal types.
898 return SDValue(DAG.UpdateNodeOperands(N, LHS, RHS, N->getOperand(2),
899 N->getOperand(3), N->getOperand(4)), 0);
902 SDValue DAGTypeLegalizer::PromoteIntOp_SETCC(SDNode *N, unsigned OpNo) {
903 assert(OpNo == 0 && "Don't know how to promote this operand!");
905 SDValue LHS = N->getOperand(0);
906 SDValue RHS = N->getOperand(1);
907 PromoteSetCCOperands(LHS, RHS, cast<CondCodeSDNode>(N->getOperand(2))->get());
909 // The CC (#2) is always legal.
910 return SDValue(DAG.UpdateNodeOperands(N, LHS, RHS, N->getOperand(2)), 0);
913 SDValue DAGTypeLegalizer::PromoteIntOp_Shift(SDNode *N) {
914 return SDValue(DAG.UpdateNodeOperands(N, N->getOperand(0),
915 ZExtPromotedInteger(N->getOperand(1))), 0);
918 SDValue DAGTypeLegalizer::PromoteIntOp_SIGN_EXTEND(SDNode *N) {
919 SDValue Op = GetPromotedInteger(N->getOperand(0));
920 DebugLoc dl = N->getDebugLoc();
921 Op = DAG.getNode(ISD::ANY_EXTEND, dl, N->getValueType(0), Op);
922 return DAG.getNode(ISD::SIGN_EXTEND_INREG, dl, Op.getValueType(),
923 Op, DAG.getValueType(N->getOperand(0).getValueType()));
926 SDValue DAGTypeLegalizer::PromoteIntOp_SINT_TO_FP(SDNode *N) {
927 return SDValue(DAG.UpdateNodeOperands(N,
928 SExtPromotedInteger(N->getOperand(0))), 0);
931 SDValue DAGTypeLegalizer::PromoteIntOp_STORE(StoreSDNode *N, unsigned OpNo){
932 assert(ISD::isUNINDEXEDStore(N) && "Indexed store during type legalization!");
933 SDValue Ch = N->getChain(), Ptr = N->getBasePtr();
934 unsigned Alignment = N->getAlignment();
935 bool isVolatile = N->isVolatile();
936 bool isNonTemporal = N->isNonTemporal();
937 DebugLoc dl = N->getDebugLoc();
939 SDValue Val = GetPromotedInteger(N->getValue()); // Get promoted value.
941 // Truncate the value and store the result.
942 return DAG.getTruncStore(Ch, dl, Val, Ptr, N->getPointerInfo(),
944 isVolatile, isNonTemporal, Alignment);
947 SDValue DAGTypeLegalizer::PromoteIntOp_TRUNCATE(SDNode *N) {
948 SDValue Op = GetPromotedInteger(N->getOperand(0));
949 return DAG.getNode(ISD::TRUNCATE, N->getDebugLoc(), N->getValueType(0), Op);
952 SDValue DAGTypeLegalizer::PromoteIntOp_UINT_TO_FP(SDNode *N) {
953 return SDValue(DAG.UpdateNodeOperands(N,
954 ZExtPromotedInteger(N->getOperand(0))), 0);
957 SDValue DAGTypeLegalizer::PromoteIntOp_ZERO_EXTEND(SDNode *N) {
958 DebugLoc dl = N->getDebugLoc();
959 SDValue Op = GetPromotedInteger(N->getOperand(0));
960 Op = DAG.getNode(ISD::ANY_EXTEND, dl, N->getValueType(0), Op);
961 return DAG.getZeroExtendInReg(Op, dl, N->getOperand(0).getValueType());
965 //===----------------------------------------------------------------------===//
966 // Integer Result Expansion
967 //===----------------------------------------------------------------------===//
969 /// ExpandIntegerResult - This method is called when the specified result of the
970 /// specified node is found to need expansion. At this point, the node may also
971 /// have invalid operands or may have other results that need promotion, we just
972 /// know that (at least) one result needs expansion.
973 void DAGTypeLegalizer::ExpandIntegerResult(SDNode *N, unsigned ResNo) {
974 DEBUG(dbgs() << "Expand integer result: "; N->dump(&DAG); dbgs() << "\n");
978 // See if the target wants to custom expand this node.
979 if (CustomLowerNode(N, N->getValueType(ResNo), true))
982 switch (N->getOpcode()) {
985 dbgs() << "ExpandIntegerResult #" << ResNo << ": ";
986 N->dump(&DAG); dbgs() << "\n";
988 llvm_unreachable("Do not know how to expand the result of this operator!");
990 case ISD::MERGE_VALUES: SplitRes_MERGE_VALUES(N, Lo, Hi); break;
991 case ISD::SELECT: SplitRes_SELECT(N, Lo, Hi); break;
992 case ISD::SELECT_CC: SplitRes_SELECT_CC(N, Lo, Hi); break;
993 case ISD::UNDEF: SplitRes_UNDEF(N, Lo, Hi); break;
995 case ISD::BITCAST: ExpandRes_BITCAST(N, Lo, Hi); break;
996 case ISD::BUILD_PAIR: ExpandRes_BUILD_PAIR(N, Lo, Hi); break;
997 case ISD::EXTRACT_ELEMENT: ExpandRes_EXTRACT_ELEMENT(N, Lo, Hi); break;
998 case ISD::EXTRACT_VECTOR_ELT: ExpandRes_EXTRACT_VECTOR_ELT(N, Lo, Hi); break;
999 case ISD::VAARG: ExpandRes_VAARG(N, Lo, Hi); break;
1001 case ISD::ANY_EXTEND: ExpandIntRes_ANY_EXTEND(N, Lo, Hi); break;
1002 case ISD::AssertSext: ExpandIntRes_AssertSext(N, Lo, Hi); break;
1003 case ISD::AssertZext: ExpandIntRes_AssertZext(N, Lo, Hi); break;
1004 case ISD::BSWAP: ExpandIntRes_BSWAP(N, Lo, Hi); break;
1005 case ISD::Constant: ExpandIntRes_Constant(N, Lo, Hi); break;
1006 case ISD::CTLZ: ExpandIntRes_CTLZ(N, Lo, Hi); break;
1007 case ISD::CTPOP: ExpandIntRes_CTPOP(N, Lo, Hi); break;
1008 case ISD::CTTZ: ExpandIntRes_CTTZ(N, Lo, Hi); break;
1009 case ISD::FP_TO_SINT: ExpandIntRes_FP_TO_SINT(N, Lo, Hi); break;
1010 case ISD::FP_TO_UINT: ExpandIntRes_FP_TO_UINT(N, Lo, Hi); break;
1011 case ISD::LOAD: ExpandIntRes_LOAD(cast<LoadSDNode>(N), Lo, Hi); break;
1012 case ISD::MUL: ExpandIntRes_MUL(N, Lo, Hi); break;
1013 case ISD::SDIV: ExpandIntRes_SDIV(N, Lo, Hi); break;
1014 case ISD::SIGN_EXTEND: ExpandIntRes_SIGN_EXTEND(N, Lo, Hi); break;
1015 case ISD::SIGN_EXTEND_INREG: ExpandIntRes_SIGN_EXTEND_INREG(N, Lo, Hi); break;
1016 case ISD::SREM: ExpandIntRes_SREM(N, Lo, Hi); break;
1017 case ISD::TRUNCATE: ExpandIntRes_TRUNCATE(N, Lo, Hi); break;
1018 case ISD::UDIV: ExpandIntRes_UDIV(N, Lo, Hi); break;
1019 case ISD::UREM: ExpandIntRes_UREM(N, Lo, Hi); break;
1020 case ISD::ZERO_EXTEND: ExpandIntRes_ZERO_EXTEND(N, Lo, Hi); break;
1022 case ISD::ATOMIC_LOAD_ADD:
1023 case ISD::ATOMIC_LOAD_SUB:
1024 case ISD::ATOMIC_LOAD_AND:
1025 case ISD::ATOMIC_LOAD_OR:
1026 case ISD::ATOMIC_LOAD_XOR:
1027 case ISD::ATOMIC_LOAD_NAND:
1028 case ISD::ATOMIC_LOAD_MIN:
1029 case ISD::ATOMIC_LOAD_MAX:
1030 case ISD::ATOMIC_LOAD_UMIN:
1031 case ISD::ATOMIC_LOAD_UMAX:
1032 case ISD::ATOMIC_SWAP: {
1033 SDValue Ch = N->getOperand(0);
1034 std::pair<SDValue, SDValue> Tmp = ExpandAtomic(N);
1035 SplitInteger(Tmp.first, Lo, Hi);
1036 ReplaceValueWith(SDValue(N, 1), Tmp.second);
1042 case ISD::XOR: ExpandIntRes_Logical(N, Lo, Hi); break;
1045 case ISD::SUB: ExpandIntRes_ADDSUB(N, Lo, Hi); break;
1048 case ISD::SUBC: ExpandIntRes_ADDSUBC(N, Lo, Hi); break;
1051 case ISD::SUBE: ExpandIntRes_ADDSUBE(N, Lo, Hi); break;
1055 case ISD::SRL: ExpandIntRes_Shift(N, Lo, Hi); break;
1058 case ISD::SSUBO: ExpandIntRes_SADDSUBO(N, Lo, Hi); break;
1060 case ISD::USUBO: ExpandIntRes_UADDSUBO(N, Lo, Hi); break;
1063 // If Lo/Hi is null, the sub-method took care of registering results etc.
1065 SetExpandedInteger(SDValue(N, ResNo), Lo, Hi);
1068 /// ExpandShiftByConstant - N is a shift by a value that needs to be expanded,
1069 /// and the shift amount is a constant 'Amt'. Expand the operation.
1070 void DAGTypeLegalizer::ExpandShiftByConstant(SDNode *N, unsigned Amt,
1071 SDValue &Lo, SDValue &Hi) {
1072 DebugLoc dl = N->getDebugLoc();
1073 // Expand the incoming operand to be shifted, so that we have its parts
1075 GetExpandedInteger(N->getOperand(0), InL, InH);
1077 EVT NVT = InL.getValueType();
1078 unsigned VTBits = N->getValueType(0).getSizeInBits();
1079 unsigned NVTBits = NVT.getSizeInBits();
1080 EVT ShTy = N->getOperand(1).getValueType();
1082 if (N->getOpcode() == ISD::SHL) {
1084 Lo = Hi = DAG.getConstant(0, NVT);
1085 } else if (Amt > NVTBits) {
1086 Lo = DAG.getConstant(0, NVT);
1087 Hi = DAG.getNode(ISD::SHL, dl,
1088 NVT, InL, DAG.getConstant(Amt-NVTBits,ShTy));
1089 } else if (Amt == NVTBits) {
1090 Lo = DAG.getConstant(0, NVT);
1092 } else if (Amt == 1 &&
1093 TLI.isOperationLegalOrCustom(ISD::ADDC,
1094 TLI.getTypeToExpandTo(*DAG.getContext(), NVT))) {
1095 // Emit this X << 1 as X+X.
1096 SDVTList VTList = DAG.getVTList(NVT, MVT::Glue);
1097 SDValue LoOps[2] = { InL, InL };
1098 Lo = DAG.getNode(ISD::ADDC, dl, VTList, LoOps, 2);
1099 SDValue HiOps[3] = { InH, InH, Lo.getValue(1) };
1100 Hi = DAG.getNode(ISD::ADDE, dl, VTList, HiOps, 3);
1102 Lo = DAG.getNode(ISD::SHL, dl, NVT, InL, DAG.getConstant(Amt, ShTy));
1103 Hi = DAG.getNode(ISD::OR, dl, NVT,
1104 DAG.getNode(ISD::SHL, dl, NVT, InH,
1105 DAG.getConstant(Amt, ShTy)),
1106 DAG.getNode(ISD::SRL, dl, NVT, InL,
1107 DAG.getConstant(NVTBits-Amt, ShTy)));
1112 if (N->getOpcode() == ISD::SRL) {
1114 Lo = DAG.getConstant(0, NVT);
1115 Hi = DAG.getConstant(0, NVT);
1116 } else if (Amt > NVTBits) {
1117 Lo = DAG.getNode(ISD::SRL, dl,
1118 NVT, InH, DAG.getConstant(Amt-NVTBits,ShTy));
1119 Hi = DAG.getConstant(0, NVT);
1120 } else if (Amt == NVTBits) {
1122 Hi = DAG.getConstant(0, NVT);
1124 Lo = DAG.getNode(ISD::OR, dl, NVT,
1125 DAG.getNode(ISD::SRL, dl, NVT, InL,
1126 DAG.getConstant(Amt, ShTy)),
1127 DAG.getNode(ISD::SHL, dl, NVT, InH,
1128 DAG.getConstant(NVTBits-Amt, ShTy)));
1129 Hi = DAG.getNode(ISD::SRL, dl, NVT, InH, DAG.getConstant(Amt, ShTy));
1134 assert(N->getOpcode() == ISD::SRA && "Unknown shift!");
1136 Hi = Lo = DAG.getNode(ISD::SRA, dl, NVT, InH,
1137 DAG.getConstant(NVTBits-1, ShTy));
1138 } else if (Amt > NVTBits) {
1139 Lo = DAG.getNode(ISD::SRA, dl, NVT, InH,
1140 DAG.getConstant(Amt-NVTBits, ShTy));
1141 Hi = DAG.getNode(ISD::SRA, dl, NVT, InH,
1142 DAG.getConstant(NVTBits-1, ShTy));
1143 } else if (Amt == NVTBits) {
1145 Hi = DAG.getNode(ISD::SRA, dl, NVT, InH,
1146 DAG.getConstant(NVTBits-1, ShTy));
1148 Lo = DAG.getNode(ISD::OR, dl, NVT,
1149 DAG.getNode(ISD::SRL, dl, NVT, InL,
1150 DAG.getConstant(Amt, ShTy)),
1151 DAG.getNode(ISD::SHL, dl, NVT, InH,
1152 DAG.getConstant(NVTBits-Amt, ShTy)));
1153 Hi = DAG.getNode(ISD::SRA, dl, NVT, InH, DAG.getConstant(Amt, ShTy));
1157 /// ExpandShiftWithKnownAmountBit - Try to determine whether we can simplify
1158 /// this shift based on knowledge of the high bit of the shift amount. If we
1159 /// can tell this, we know that it is >= 32 or < 32, without knowing the actual
1161 bool DAGTypeLegalizer::
1162 ExpandShiftWithKnownAmountBit(SDNode *N, SDValue &Lo, SDValue &Hi) {
1163 SDValue Amt = N->getOperand(1);
1164 EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
1165 EVT ShTy = Amt.getValueType();
1166 unsigned ShBits = ShTy.getScalarType().getSizeInBits();
1167 unsigned NVTBits = NVT.getScalarType().getSizeInBits();
1168 assert(isPowerOf2_32(NVTBits) &&
1169 "Expanded integer type size not a power of two!");
1170 DebugLoc dl = N->getDebugLoc();
1172 APInt HighBitMask = APInt::getHighBitsSet(ShBits, ShBits - Log2_32(NVTBits));
1173 APInt KnownZero, KnownOne;
1174 DAG.ComputeMaskedBits(N->getOperand(1), HighBitMask, KnownZero, KnownOne);
1176 // If we don't know anything about the high bits, exit.
1177 if (((KnownZero|KnownOne) & HighBitMask) == 0)
1180 // Get the incoming operand to be shifted.
1182 GetExpandedInteger(N->getOperand(0), InL, InH);
1184 // If we know that any of the high bits of the shift amount are one, then we
1185 // can do this as a couple of simple shifts.
1186 if (KnownOne.intersects(HighBitMask)) {
1187 // Mask out the high bit, which we know is set.
1188 Amt = DAG.getNode(ISD::AND, dl, ShTy, Amt,
1189 DAG.getConstant(~HighBitMask, ShTy));
1191 switch (N->getOpcode()) {
1192 default: llvm_unreachable("Unknown shift");
1194 Lo = DAG.getConstant(0, NVT); // Low part is zero.
1195 Hi = DAG.getNode(ISD::SHL, dl, NVT, InL, Amt); // High part from Lo part.
1198 Hi = DAG.getConstant(0, NVT); // Hi part is zero.
1199 Lo = DAG.getNode(ISD::SRL, dl, NVT, InH, Amt); // Lo part from Hi part.
1202 Hi = DAG.getNode(ISD::SRA, dl, NVT, InH, // Sign extend high part.
1203 DAG.getConstant(NVTBits-1, ShTy));
1204 Lo = DAG.getNode(ISD::SRA, dl, NVT, InH, Amt); // Lo part from Hi part.
1210 // FIXME: This code is broken for shifts with a zero amount!
1211 // If we know that all of the high bits of the shift amount are zero, then we
1212 // can do this as a couple of simple shifts.
1213 if ((KnownZero & HighBitMask) == HighBitMask) {
1215 SDValue Amt2 = DAG.getNode(ISD::SUB, ShTy,
1216 DAG.getConstant(NVTBits, ShTy),
1219 switch (N->getOpcode()) {
1220 default: llvm_unreachable("Unknown shift");
1221 case ISD::SHL: Op1 = ISD::SHL; Op2 = ISD::SRL; break;
1223 case ISD::SRA: Op1 = ISD::SRL; Op2 = ISD::SHL; break;
1226 Lo = DAG.getNode(N->getOpcode(), NVT, InL, Amt);
1227 Hi = DAG.getNode(ISD::OR, NVT,
1228 DAG.getNode(Op1, NVT, InH, Amt),
1229 DAG.getNode(Op2, NVT, InL, Amt2));
1237 /// ExpandShiftWithUnknownAmountBit - Fully general expansion of integer shift
1239 bool DAGTypeLegalizer::
1240 ExpandShiftWithUnknownAmountBit(SDNode *N, SDValue &Lo, SDValue &Hi) {
1241 SDValue Amt = N->getOperand(1);
1242 EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
1243 EVT ShTy = Amt.getValueType();
1244 unsigned NVTBits = NVT.getSizeInBits();
1245 assert(isPowerOf2_32(NVTBits) &&
1246 "Expanded integer type size not a power of two!");
1247 DebugLoc dl = N->getDebugLoc();
1249 // Get the incoming operand to be shifted.
1251 GetExpandedInteger(N->getOperand(0), InL, InH);
1253 SDValue NVBitsNode = DAG.getConstant(NVTBits, ShTy);
1254 SDValue AmtExcess = DAG.getNode(ISD::SUB, dl, ShTy, Amt, NVBitsNode);
1255 SDValue AmtLack = DAG.getNode(ISD::SUB, dl, ShTy, NVBitsNode, Amt);
1256 SDValue isShort = DAG.getSetCC(dl, TLI.getSetCCResultType(ShTy),
1257 Amt, NVBitsNode, ISD::SETULT);
1259 SDValue LoS, HiS, LoL, HiL;
1260 switch (N->getOpcode()) {
1261 default: llvm_unreachable("Unknown shift");
1263 // Short: ShAmt < NVTBits
1264 LoS = DAG.getNode(ISD::SHL, dl, NVT, InL, Amt);
1265 HiS = DAG.getNode(ISD::OR, dl, NVT,
1266 DAG.getNode(ISD::SHL, dl, NVT, InH, Amt),
1267 // FIXME: If Amt is zero, the following shift generates an undefined result
1268 // on some architectures.
1269 DAG.getNode(ISD::SRL, dl, NVT, InL, AmtLack));
1271 // Long: ShAmt >= NVTBits
1272 LoL = DAG.getConstant(0, NVT); // Lo part is zero.
1273 HiL = DAG.getNode(ISD::SHL, dl, NVT, InL, AmtExcess); // Hi from Lo part.
1275 Lo = DAG.getNode(ISD::SELECT, dl, NVT, isShort, LoS, LoL);
1276 Hi = DAG.getNode(ISD::SELECT, dl, NVT, isShort, HiS, HiL);
1279 // Short: ShAmt < NVTBits
1280 HiS = DAG.getNode(ISD::SRL, dl, NVT, InH, Amt);
1281 LoS = DAG.getNode(ISD::OR, dl, NVT,
1282 DAG.getNode(ISD::SRL, dl, NVT, InL, Amt),
1283 // FIXME: If Amt is zero, the following shift generates an undefined result
1284 // on some architectures.
1285 DAG.getNode(ISD::SHL, dl, NVT, InH, AmtLack));
1287 // Long: ShAmt >= NVTBits
1288 HiL = DAG.getConstant(0, NVT); // Hi part is zero.
1289 LoL = DAG.getNode(ISD::SRL, dl, NVT, InH, AmtExcess); // Lo from Hi part.
1291 Lo = DAG.getNode(ISD::SELECT, dl, NVT, isShort, LoS, LoL);
1292 Hi = DAG.getNode(ISD::SELECT, dl, NVT, isShort, HiS, HiL);
1295 // Short: ShAmt < NVTBits
1296 HiS = DAG.getNode(ISD::SRA, dl, NVT, InH, Amt);
1297 LoS = DAG.getNode(ISD::OR, dl, NVT,
1298 DAG.getNode(ISD::SRL, dl, NVT, InL, Amt),
1299 // FIXME: If Amt is zero, the following shift generates an undefined result
1300 // on some architectures.
1301 DAG.getNode(ISD::SHL, dl, NVT, InH, AmtLack));
1303 // Long: ShAmt >= NVTBits
1304 HiL = DAG.getNode(ISD::SRA, dl, NVT, InH, // Sign of Hi part.
1305 DAG.getConstant(NVTBits-1, ShTy));
1306 LoL = DAG.getNode(ISD::SRA, dl, NVT, InH, AmtExcess); // Lo from Hi part.
1308 Lo = DAG.getNode(ISD::SELECT, dl, NVT, isShort, LoS, LoL);
1309 Hi = DAG.getNode(ISD::SELECT, dl, NVT, isShort, HiS, HiL);
1316 void DAGTypeLegalizer::ExpandIntRes_ADDSUB(SDNode *N,
1317 SDValue &Lo, SDValue &Hi) {
1318 DebugLoc dl = N->getDebugLoc();
1319 // Expand the subcomponents.
1320 SDValue LHSL, LHSH, RHSL, RHSH;
1321 GetExpandedInteger(N->getOperand(0), LHSL, LHSH);
1322 GetExpandedInteger(N->getOperand(1), RHSL, RHSH);
1324 EVT NVT = LHSL.getValueType();
1325 SDValue LoOps[2] = { LHSL, RHSL };
1326 SDValue HiOps[3] = { LHSH, RHSH };
1328 // Do not generate ADDC/ADDE or SUBC/SUBE if the target does not support
1329 // them. TODO: Teach operation legalization how to expand unsupported
1330 // ADDC/ADDE/SUBC/SUBE. The problem is that these operations generate
1331 // a carry of type MVT::Glue, but there doesn't seem to be any way to
1332 // generate a value of this type in the expanded code sequence.
1334 TLI.isOperationLegalOrCustom(N->getOpcode() == ISD::ADD ?
1335 ISD::ADDC : ISD::SUBC,
1336 TLI.getTypeToExpandTo(*DAG.getContext(), NVT));
1339 SDVTList VTList = DAG.getVTList(NVT, MVT::Glue);
1340 if (N->getOpcode() == ISD::ADD) {
1341 Lo = DAG.getNode(ISD::ADDC, dl, VTList, LoOps, 2);
1342 HiOps[2] = Lo.getValue(1);
1343 Hi = DAG.getNode(ISD::ADDE, dl, VTList, HiOps, 3);
1345 Lo = DAG.getNode(ISD::SUBC, dl, VTList, LoOps, 2);
1346 HiOps[2] = Lo.getValue(1);
1347 Hi = DAG.getNode(ISD::SUBE, dl, VTList, HiOps, 3);
1352 if (N->getOpcode() == ISD::ADD) {
1353 Lo = DAG.getNode(ISD::ADD, dl, NVT, LoOps, 2);
1354 Hi = DAG.getNode(ISD::ADD, dl, NVT, HiOps, 2);
1355 SDValue Cmp1 = DAG.getSetCC(dl, TLI.getSetCCResultType(NVT), Lo, LoOps[0],
1357 SDValue Carry1 = DAG.getNode(ISD::SELECT, dl, NVT, Cmp1,
1358 DAG.getConstant(1, NVT),
1359 DAG.getConstant(0, NVT));
1360 SDValue Cmp2 = DAG.getSetCC(dl, TLI.getSetCCResultType(NVT), Lo, LoOps[1],
1362 SDValue Carry2 = DAG.getNode(ISD::SELECT, dl, NVT, Cmp2,
1363 DAG.getConstant(1, NVT), Carry1);
1364 Hi = DAG.getNode(ISD::ADD, dl, NVT, Hi, Carry2);
1366 Lo = DAG.getNode(ISD::SUB, dl, NVT, LoOps, 2);
1367 Hi = DAG.getNode(ISD::SUB, dl, NVT, HiOps, 2);
1369 DAG.getSetCC(dl, TLI.getSetCCResultType(LoOps[0].getValueType()),
1370 LoOps[0], LoOps[1], ISD::SETULT);
1371 SDValue Borrow = DAG.getNode(ISD::SELECT, dl, NVT, Cmp,
1372 DAG.getConstant(1, NVT),
1373 DAG.getConstant(0, NVT));
1374 Hi = DAG.getNode(ISD::SUB, dl, NVT, Hi, Borrow);
1378 void DAGTypeLegalizer::ExpandIntRes_ADDSUBC(SDNode *N,
1379 SDValue &Lo, SDValue &Hi) {
1380 // Expand the subcomponents.
1381 SDValue LHSL, LHSH, RHSL, RHSH;
1382 DebugLoc dl = N->getDebugLoc();
1383 GetExpandedInteger(N->getOperand(0), LHSL, LHSH);
1384 GetExpandedInteger(N->getOperand(1), RHSL, RHSH);
1385 SDVTList VTList = DAG.getVTList(LHSL.getValueType(), MVT::Glue);
1386 SDValue LoOps[2] = { LHSL, RHSL };
1387 SDValue HiOps[3] = { LHSH, RHSH };
1389 if (N->getOpcode() == ISD::ADDC) {
1390 Lo = DAG.getNode(ISD::ADDC, dl, VTList, LoOps, 2);
1391 HiOps[2] = Lo.getValue(1);
1392 Hi = DAG.getNode(ISD::ADDE, dl, VTList, HiOps, 3);
1394 Lo = DAG.getNode(ISD::SUBC, dl, VTList, LoOps, 2);
1395 HiOps[2] = Lo.getValue(1);
1396 Hi = DAG.getNode(ISD::SUBE, dl, VTList, HiOps, 3);
1399 // Legalized the flag result - switch anything that used the old flag to
1401 ReplaceValueWith(SDValue(N, 1), Hi.getValue(1));
1404 void DAGTypeLegalizer::ExpandIntRes_ADDSUBE(SDNode *N,
1405 SDValue &Lo, SDValue &Hi) {
1406 // Expand the subcomponents.
1407 SDValue LHSL, LHSH, RHSL, RHSH;
1408 DebugLoc dl = N->getDebugLoc();
1409 GetExpandedInteger(N->getOperand(0), LHSL, LHSH);
1410 GetExpandedInteger(N->getOperand(1), RHSL, RHSH);
1411 SDVTList VTList = DAG.getVTList(LHSL.getValueType(), MVT::Glue);
1412 SDValue LoOps[3] = { LHSL, RHSL, N->getOperand(2) };
1413 SDValue HiOps[3] = { LHSH, RHSH };
1415 Lo = DAG.getNode(N->getOpcode(), dl, VTList, LoOps, 3);
1416 HiOps[2] = Lo.getValue(1);
1417 Hi = DAG.getNode(N->getOpcode(), dl, VTList, HiOps, 3);
1419 // Legalized the flag result - switch anything that used the old flag to
1421 ReplaceValueWith(SDValue(N, 1), Hi.getValue(1));
1424 void DAGTypeLegalizer::ExpandIntRes_ANY_EXTEND(SDNode *N,
1425 SDValue &Lo, SDValue &Hi) {
1426 EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
1427 DebugLoc dl = N->getDebugLoc();
1428 SDValue Op = N->getOperand(0);
1429 if (Op.getValueType().bitsLE(NVT)) {
1430 // The low part is any extension of the input (which degenerates to a copy).
1431 Lo = DAG.getNode(ISD::ANY_EXTEND, dl, NVT, Op);
1432 Hi = DAG.getUNDEF(NVT); // The high part is undefined.
1434 // For example, extension of an i48 to an i64. The operand type necessarily
1435 // promotes to the result type, so will end up being expanded too.
1436 assert(getTypeAction(Op.getValueType()) == PromoteInteger &&
1437 "Only know how to promote this result!");
1438 SDValue Res = GetPromotedInteger(Op);
1439 assert(Res.getValueType() == N->getValueType(0) &&
1440 "Operand over promoted?");
1441 // Split the promoted operand. This will simplify when it is expanded.
1442 SplitInteger(Res, Lo, Hi);
1446 void DAGTypeLegalizer::ExpandIntRes_AssertSext(SDNode *N,
1447 SDValue &Lo, SDValue &Hi) {
1448 DebugLoc dl = N->getDebugLoc();
1449 GetExpandedInteger(N->getOperand(0), Lo, Hi);
1450 EVT NVT = Lo.getValueType();
1451 EVT EVT = cast<VTSDNode>(N->getOperand(1))->getVT();
1452 unsigned NVTBits = NVT.getSizeInBits();
1453 unsigned EVTBits = EVT.getSizeInBits();
1455 if (NVTBits < EVTBits) {
1456 Hi = DAG.getNode(ISD::AssertSext, dl, NVT, Hi,
1457 DAG.getValueType(EVT::getIntegerVT(*DAG.getContext(),
1458 EVTBits - NVTBits)));
1460 Lo = DAG.getNode(ISD::AssertSext, dl, NVT, Lo, DAG.getValueType(EVT));
1461 // The high part replicates the sign bit of Lo, make it explicit.
1462 Hi = DAG.getNode(ISD::SRA, dl, NVT, Lo,
1463 DAG.getConstant(NVTBits-1, TLI.getPointerTy()));
1467 void DAGTypeLegalizer::ExpandIntRes_AssertZext(SDNode *N,
1468 SDValue &Lo, SDValue &Hi) {
1469 DebugLoc dl = N->getDebugLoc();
1470 GetExpandedInteger(N->getOperand(0), Lo, Hi);
1471 EVT NVT = Lo.getValueType();
1472 EVT EVT = cast<VTSDNode>(N->getOperand(1))->getVT();
1473 unsigned NVTBits = NVT.getSizeInBits();
1474 unsigned EVTBits = EVT.getSizeInBits();
1476 if (NVTBits < EVTBits) {
1477 Hi = DAG.getNode(ISD::AssertZext, dl, NVT, Hi,
1478 DAG.getValueType(EVT::getIntegerVT(*DAG.getContext(),
1479 EVTBits - NVTBits)));
1481 Lo = DAG.getNode(ISD::AssertZext, dl, NVT, Lo, DAG.getValueType(EVT));
1482 // The high part must be zero, make it explicit.
1483 Hi = DAG.getConstant(0, NVT);
1487 void DAGTypeLegalizer::ExpandIntRes_BSWAP(SDNode *N,
1488 SDValue &Lo, SDValue &Hi) {
1489 DebugLoc dl = N->getDebugLoc();
1490 GetExpandedInteger(N->getOperand(0), Hi, Lo); // Note swapped operands.
1491 Lo = DAG.getNode(ISD::BSWAP, dl, Lo.getValueType(), Lo);
1492 Hi = DAG.getNode(ISD::BSWAP, dl, Hi.getValueType(), Hi);
1495 void DAGTypeLegalizer::ExpandIntRes_Constant(SDNode *N,
1496 SDValue &Lo, SDValue &Hi) {
1497 EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
1498 unsigned NBitWidth = NVT.getSizeInBits();
1499 const APInt &Cst = cast<ConstantSDNode>(N)->getAPIntValue();
1500 Lo = DAG.getConstant(Cst.trunc(NBitWidth), NVT);
1501 Hi = DAG.getConstant(Cst.lshr(NBitWidth).trunc(NBitWidth), NVT);
1504 void DAGTypeLegalizer::ExpandIntRes_CTLZ(SDNode *N,
1505 SDValue &Lo, SDValue &Hi) {
1506 DebugLoc dl = N->getDebugLoc();
1507 // ctlz (HiLo) -> Hi != 0 ? ctlz(Hi) : (ctlz(Lo)+32)
1508 GetExpandedInteger(N->getOperand(0), Lo, Hi);
1509 EVT NVT = Lo.getValueType();
1511 SDValue HiNotZero = DAG.getSetCC(dl, TLI.getSetCCResultType(NVT), Hi,
1512 DAG.getConstant(0, NVT), ISD::SETNE);
1514 SDValue LoLZ = DAG.getNode(ISD::CTLZ, dl, NVT, Lo);
1515 SDValue HiLZ = DAG.getNode(ISD::CTLZ, dl, NVT, Hi);
1517 Lo = DAG.getNode(ISD::SELECT, dl, NVT, HiNotZero, HiLZ,
1518 DAG.getNode(ISD::ADD, dl, NVT, LoLZ,
1519 DAG.getConstant(NVT.getSizeInBits(), NVT)));
1520 Hi = DAG.getConstant(0, NVT);
1523 void DAGTypeLegalizer::ExpandIntRes_CTPOP(SDNode *N,
1524 SDValue &Lo, SDValue &Hi) {
1525 DebugLoc dl = N->getDebugLoc();
1526 // ctpop(HiLo) -> ctpop(Hi)+ctpop(Lo)
1527 GetExpandedInteger(N->getOperand(0), Lo, Hi);
1528 EVT NVT = Lo.getValueType();
1529 Lo = DAG.getNode(ISD::ADD, dl, NVT, DAG.getNode(ISD::CTPOP, dl, NVT, Lo),
1530 DAG.getNode(ISD::CTPOP, dl, NVT, Hi));
1531 Hi = DAG.getConstant(0, NVT);
1534 void DAGTypeLegalizer::ExpandIntRes_CTTZ(SDNode *N,
1535 SDValue &Lo, SDValue &Hi) {
1536 DebugLoc dl = N->getDebugLoc();
1537 // cttz (HiLo) -> Lo != 0 ? cttz(Lo) : (cttz(Hi)+32)
1538 GetExpandedInteger(N->getOperand(0), Lo, Hi);
1539 EVT NVT = Lo.getValueType();
1541 SDValue LoNotZero = DAG.getSetCC(dl, TLI.getSetCCResultType(NVT), Lo,
1542 DAG.getConstant(0, NVT), ISD::SETNE);
1544 SDValue LoLZ = DAG.getNode(ISD::CTTZ, dl, NVT, Lo);
1545 SDValue HiLZ = DAG.getNode(ISD::CTTZ, dl, NVT, Hi);
1547 Lo = DAG.getNode(ISD::SELECT, dl, NVT, LoNotZero, LoLZ,
1548 DAG.getNode(ISD::ADD, dl, NVT, HiLZ,
1549 DAG.getConstant(NVT.getSizeInBits(), NVT)));
1550 Hi = DAG.getConstant(0, NVT);
1553 void DAGTypeLegalizer::ExpandIntRes_FP_TO_SINT(SDNode *N, SDValue &Lo,
1555 DebugLoc dl = N->getDebugLoc();
1556 EVT VT = N->getValueType(0);
1557 SDValue Op = N->getOperand(0);
1558 RTLIB::Libcall LC = RTLIB::getFPTOSINT(Op.getValueType(), VT);
1559 assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unexpected fp-to-sint conversion!");
1560 SplitInteger(MakeLibCall(LC, VT, &Op, 1, true/*irrelevant*/, dl), Lo, Hi);
1563 void DAGTypeLegalizer::ExpandIntRes_FP_TO_UINT(SDNode *N, SDValue &Lo,
1565 DebugLoc dl = N->getDebugLoc();
1566 EVT VT = N->getValueType(0);
1567 SDValue Op = N->getOperand(0);
1568 RTLIB::Libcall LC = RTLIB::getFPTOUINT(Op.getValueType(), VT);
1569 assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unexpected fp-to-uint conversion!");
1570 SplitInteger(MakeLibCall(LC, VT, &Op, 1, false/*irrelevant*/, dl), Lo, Hi);
1573 void DAGTypeLegalizer::ExpandIntRes_LOAD(LoadSDNode *N,
1574 SDValue &Lo, SDValue &Hi) {
1575 if (ISD::isNormalLoad(N)) {
1576 ExpandRes_NormalLoad(N, Lo, Hi);
1580 assert(ISD::isUNINDEXEDLoad(N) && "Indexed load during type legalization!");
1582 EVT VT = N->getValueType(0);
1583 EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), VT);
1584 SDValue Ch = N->getChain();
1585 SDValue Ptr = N->getBasePtr();
1586 ISD::LoadExtType ExtType = N->getExtensionType();
1587 unsigned Alignment = N->getAlignment();
1588 bool isVolatile = N->isVolatile();
1589 bool isNonTemporal = N->isNonTemporal();
1590 DebugLoc dl = N->getDebugLoc();
1592 assert(NVT.isByteSized() && "Expanded type not byte sized!");
1594 if (N->getMemoryVT().bitsLE(NVT)) {
1595 EVT MemVT = N->getMemoryVT();
1597 Lo = DAG.getExtLoad(ExtType, NVT, dl, Ch, Ptr, N->getPointerInfo(),
1598 MemVT, isVolatile, isNonTemporal, Alignment);
1600 // Remember the chain.
1601 Ch = Lo.getValue(1);
1603 if (ExtType == ISD::SEXTLOAD) {
1604 // The high part is obtained by SRA'ing all but one of the bits of the
1606 unsigned LoSize = Lo.getValueType().getSizeInBits();
1607 Hi = DAG.getNode(ISD::SRA, dl, NVT, Lo,
1608 DAG.getConstant(LoSize-1, TLI.getPointerTy()));
1609 } else if (ExtType == ISD::ZEXTLOAD) {
1610 // The high part is just a zero.
1611 Hi = DAG.getConstant(0, NVT);
1613 assert(ExtType == ISD::EXTLOAD && "Unknown extload!");
1614 // The high part is undefined.
1615 Hi = DAG.getUNDEF(NVT);
1617 } else if (TLI.isLittleEndian()) {
1618 // Little-endian - low bits are at low addresses.
1619 Lo = DAG.getLoad(NVT, dl, Ch, Ptr, N->getPointerInfo(),
1620 isVolatile, isNonTemporal, Alignment);
1622 unsigned ExcessBits =
1623 N->getMemoryVT().getSizeInBits() - NVT.getSizeInBits();
1624 EVT NEVT = EVT::getIntegerVT(*DAG.getContext(), ExcessBits);
1626 // Increment the pointer to the other half.
1627 unsigned IncrementSize = NVT.getSizeInBits()/8;
1628 Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr,
1629 DAG.getIntPtrConstant(IncrementSize));
1630 Hi = DAG.getExtLoad(ExtType, NVT, dl, Ch, Ptr,
1631 N->getPointerInfo().getWithOffset(IncrementSize), NEVT,
1632 isVolatile, isNonTemporal,
1633 MinAlign(Alignment, IncrementSize));
1635 // Build a factor node to remember that this load is independent of the
1637 Ch = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Lo.getValue(1),
1640 // Big-endian - high bits are at low addresses. Favor aligned loads at
1641 // the cost of some bit-fiddling.
1642 EVT MemVT = N->getMemoryVT();
1643 unsigned EBytes = MemVT.getStoreSize();
1644 unsigned IncrementSize = NVT.getSizeInBits()/8;
1645 unsigned ExcessBits = (EBytes - IncrementSize)*8;
1647 // Load both the high bits and maybe some of the low bits.
1648 Hi = DAG.getExtLoad(ExtType, NVT, dl, Ch, Ptr, N->getPointerInfo(),
1649 EVT::getIntegerVT(*DAG.getContext(),
1650 MemVT.getSizeInBits() - ExcessBits),
1651 isVolatile, isNonTemporal, Alignment);
1653 // Increment the pointer to the other half.
1654 Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr,
1655 DAG.getIntPtrConstant(IncrementSize));
1656 // Load the rest of the low bits.
1657 Lo = DAG.getExtLoad(ISD::ZEXTLOAD, NVT, dl, Ch, Ptr,
1658 N->getPointerInfo().getWithOffset(IncrementSize),
1659 EVT::getIntegerVT(*DAG.getContext(), ExcessBits),
1660 isVolatile, isNonTemporal,
1661 MinAlign(Alignment, IncrementSize));
1663 // Build a factor node to remember that this load is independent of the
1665 Ch = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Lo.getValue(1),
1668 if (ExcessBits < NVT.getSizeInBits()) {
1669 // Transfer low bits from the bottom of Hi to the top of Lo.
1670 Lo = DAG.getNode(ISD::OR, dl, NVT, Lo,
1671 DAG.getNode(ISD::SHL, dl, NVT, Hi,
1672 DAG.getConstant(ExcessBits,
1673 TLI.getPointerTy())));
1674 // Move high bits to the right position in Hi.
1675 Hi = DAG.getNode(ExtType == ISD::SEXTLOAD ? ISD::SRA : ISD::SRL, dl,
1677 DAG.getConstant(NVT.getSizeInBits() - ExcessBits,
1678 TLI.getPointerTy()));
1682 // Legalized the chain result - switch anything that used the old chain to
1684 ReplaceValueWith(SDValue(N, 1), Ch);
1687 void DAGTypeLegalizer::ExpandIntRes_Logical(SDNode *N,
1688 SDValue &Lo, SDValue &Hi) {
1689 DebugLoc dl = N->getDebugLoc();
1690 SDValue LL, LH, RL, RH;
1691 GetExpandedInteger(N->getOperand(0), LL, LH);
1692 GetExpandedInteger(N->getOperand(1), RL, RH);
1693 Lo = DAG.getNode(N->getOpcode(), dl, LL.getValueType(), LL, RL);
1694 Hi = DAG.getNode(N->getOpcode(), dl, LL.getValueType(), LH, RH);
1697 void DAGTypeLegalizer::ExpandIntRes_MUL(SDNode *N,
1698 SDValue &Lo, SDValue &Hi) {
1699 EVT VT = N->getValueType(0);
1700 EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), VT);
1701 DebugLoc dl = N->getDebugLoc();
1703 bool HasMULHS = TLI.isOperationLegalOrCustom(ISD::MULHS, NVT);
1704 bool HasMULHU = TLI.isOperationLegalOrCustom(ISD::MULHU, NVT);
1705 bool HasSMUL_LOHI = TLI.isOperationLegalOrCustom(ISD::SMUL_LOHI, NVT);
1706 bool HasUMUL_LOHI = TLI.isOperationLegalOrCustom(ISD::UMUL_LOHI, NVT);
1707 if (HasMULHU || HasMULHS || HasUMUL_LOHI || HasSMUL_LOHI) {
1708 SDValue LL, LH, RL, RH;
1709 GetExpandedInteger(N->getOperand(0), LL, LH);
1710 GetExpandedInteger(N->getOperand(1), RL, RH);
1711 unsigned OuterBitSize = VT.getSizeInBits();
1712 unsigned InnerBitSize = NVT.getSizeInBits();
1713 unsigned LHSSB = DAG.ComputeNumSignBits(N->getOperand(0));
1714 unsigned RHSSB = DAG.ComputeNumSignBits(N->getOperand(1));
1716 APInt HighMask = APInt::getHighBitsSet(OuterBitSize, InnerBitSize);
1717 if (DAG.MaskedValueIsZero(N->getOperand(0), HighMask) &&
1718 DAG.MaskedValueIsZero(N->getOperand(1), HighMask)) {
1719 // The inputs are both zero-extended.
1721 // We can emit a umul_lohi.
1722 Lo = DAG.getNode(ISD::UMUL_LOHI, dl, DAG.getVTList(NVT, NVT), LL, RL);
1723 Hi = SDValue(Lo.getNode(), 1);
1727 // We can emit a mulhu+mul.
1728 Lo = DAG.getNode(ISD::MUL, dl, NVT, LL, RL);
1729 Hi = DAG.getNode(ISD::MULHU, dl, NVT, LL, RL);
1733 if (LHSSB > InnerBitSize && RHSSB > InnerBitSize) {
1734 // The input values are both sign-extended.
1736 // We can emit a smul_lohi.
1737 Lo = DAG.getNode(ISD::SMUL_LOHI, dl, DAG.getVTList(NVT, NVT), LL, RL);
1738 Hi = SDValue(Lo.getNode(), 1);
1742 // We can emit a mulhs+mul.
1743 Lo = DAG.getNode(ISD::MUL, dl, NVT, LL, RL);
1744 Hi = DAG.getNode(ISD::MULHS, dl, NVT, LL, RL);
1749 // Lo,Hi = umul LHS, RHS.
1750 SDValue UMulLOHI = DAG.getNode(ISD::UMUL_LOHI, dl,
1751 DAG.getVTList(NVT, NVT), LL, RL);
1753 Hi = UMulLOHI.getValue(1);
1754 RH = DAG.getNode(ISD::MUL, dl, NVT, LL, RH);
1755 LH = DAG.getNode(ISD::MUL, dl, NVT, LH, RL);
1756 Hi = DAG.getNode(ISD::ADD, dl, NVT, Hi, RH);
1757 Hi = DAG.getNode(ISD::ADD, dl, NVT, Hi, LH);
1761 Lo = DAG.getNode(ISD::MUL, dl, NVT, LL, RL);
1762 Hi = DAG.getNode(ISD::MULHU, dl, NVT, LL, RL);
1763 RH = DAG.getNode(ISD::MUL, dl, NVT, LL, RH);
1764 LH = DAG.getNode(ISD::MUL, dl, NVT, LH, RL);
1765 Hi = DAG.getNode(ISD::ADD, dl, NVT, Hi, RH);
1766 Hi = DAG.getNode(ISD::ADD, dl, NVT, Hi, LH);
1771 // If nothing else, we can make a libcall.
1772 RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
1774 LC = RTLIB::MUL_I16;
1775 else if (VT == MVT::i32)
1776 LC = RTLIB::MUL_I32;
1777 else if (VT == MVT::i64)
1778 LC = RTLIB::MUL_I64;
1779 else if (VT == MVT::i128)
1780 LC = RTLIB::MUL_I128;
1781 assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unsupported MUL!");
1783 SDValue Ops[2] = { N->getOperand(0), N->getOperand(1) };
1784 SplitInteger(MakeLibCall(LC, VT, Ops, 2, true/*irrelevant*/, dl), Lo, Hi);
1787 void DAGTypeLegalizer::ExpandIntRes_SADDSUBO(SDNode *Node,
1788 SDValue &Lo, SDValue &Hi) {
1789 SDValue LHS = Node->getOperand(0);
1790 SDValue RHS = Node->getOperand(1);
1791 DebugLoc dl = Node->getDebugLoc();
1793 // Expand the result by simply replacing it with the equivalent
1794 // non-overflow-checking operation.
1795 SDValue Sum = DAG.getNode(Node->getOpcode() == ISD::SADDO ?
1796 ISD::ADD : ISD::SUB, dl, LHS.getValueType(),
1798 SplitInteger(Sum, Lo, Hi);
1800 // Compute the overflow.
1802 // LHSSign -> LHS >= 0
1803 // RHSSign -> RHS >= 0
1804 // SumSign -> Sum >= 0
1807 // Overflow -> (LHSSign == RHSSign) && (LHSSign != SumSign)
1809 // Overflow -> (LHSSign != RHSSign) && (LHSSign != SumSign)
1811 EVT OType = Node->getValueType(1);
1812 SDValue Zero = DAG.getConstant(0, LHS.getValueType());
1814 SDValue LHSSign = DAG.getSetCC(dl, OType, LHS, Zero, ISD::SETGE);
1815 SDValue RHSSign = DAG.getSetCC(dl, OType, RHS, Zero, ISD::SETGE);
1816 SDValue SignsMatch = DAG.getSetCC(dl, OType, LHSSign, RHSSign,
1817 Node->getOpcode() == ISD::SADDO ?
1818 ISD::SETEQ : ISD::SETNE);
1820 SDValue SumSign = DAG.getSetCC(dl, OType, Sum, Zero, ISD::SETGE);
1821 SDValue SumSignNE = DAG.getSetCC(dl, OType, LHSSign, SumSign, ISD::SETNE);
1823 SDValue Cmp = DAG.getNode(ISD::AND, dl, OType, SignsMatch, SumSignNE);
1825 // Use the calculated overflow everywhere.
1826 ReplaceValueWith(SDValue(Node, 1), Cmp);
1829 void DAGTypeLegalizer::ExpandIntRes_SDIV(SDNode *N,
1830 SDValue &Lo, SDValue &Hi) {
1831 EVT VT = N->getValueType(0);
1832 DebugLoc dl = N->getDebugLoc();
1834 RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
1836 LC = RTLIB::SDIV_I16;
1837 else if (VT == MVT::i32)
1838 LC = RTLIB::SDIV_I32;
1839 else if (VT == MVT::i64)
1840 LC = RTLIB::SDIV_I64;
1841 else if (VT == MVT::i128)
1842 LC = RTLIB::SDIV_I128;
1843 assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unsupported SDIV!");
1845 SDValue Ops[2] = { N->getOperand(0), N->getOperand(1) };
1846 SplitInteger(MakeLibCall(LC, VT, Ops, 2, true, dl), Lo, Hi);
1849 void DAGTypeLegalizer::ExpandIntRes_Shift(SDNode *N,
1850 SDValue &Lo, SDValue &Hi) {
1851 EVT VT = N->getValueType(0);
1852 DebugLoc dl = N->getDebugLoc();
1854 // If we can emit an efficient shift operation, do so now. Check to see if
1855 // the RHS is a constant.
1856 if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N->getOperand(1)))
1857 return ExpandShiftByConstant(N, CN->getZExtValue(), Lo, Hi);
1859 // If we can determine that the high bit of the shift is zero or one, even if
1860 // the low bits are variable, emit this shift in an optimized form.
1861 if (ExpandShiftWithKnownAmountBit(N, Lo, Hi))
1864 // If this target supports shift_PARTS, use it. First, map to the _PARTS opc.
1866 if (N->getOpcode() == ISD::SHL) {
1867 PartsOpc = ISD::SHL_PARTS;
1868 } else if (N->getOpcode() == ISD::SRL) {
1869 PartsOpc = ISD::SRL_PARTS;
1871 assert(N->getOpcode() == ISD::SRA && "Unknown shift!");
1872 PartsOpc = ISD::SRA_PARTS;
1875 // Next check to see if the target supports this SHL_PARTS operation or if it
1876 // will custom expand it.
1877 EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), VT);
1878 TargetLowering::LegalizeAction Action = TLI.getOperationAction(PartsOpc, NVT);
1879 if ((Action == TargetLowering::Legal && TLI.isTypeLegal(NVT)) ||
1880 Action == TargetLowering::Custom) {
1881 // Expand the subcomponents.
1883 GetExpandedInteger(N->getOperand(0), LHSL, LHSH);
1885 SDValue Ops[] = { LHSL, LHSH, N->getOperand(1) };
1886 EVT VT = LHSL.getValueType();
1887 Lo = DAG.getNode(PartsOpc, dl, DAG.getVTList(VT, VT), Ops, 3);
1888 Hi = Lo.getValue(1);
1892 // Otherwise, emit a libcall.
1893 RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
1895 if (N->getOpcode() == ISD::SHL) {
1896 isSigned = false; /*sign irrelevant*/
1898 LC = RTLIB::SHL_I16;
1899 else if (VT == MVT::i32)
1900 LC = RTLIB::SHL_I32;
1901 else if (VT == MVT::i64)
1902 LC = RTLIB::SHL_I64;
1903 else if (VT == MVT::i128)
1904 LC = RTLIB::SHL_I128;
1905 } else if (N->getOpcode() == ISD::SRL) {
1908 LC = RTLIB::SRL_I16;
1909 else if (VT == MVT::i32)
1910 LC = RTLIB::SRL_I32;
1911 else if (VT == MVT::i64)
1912 LC = RTLIB::SRL_I64;
1913 else if (VT == MVT::i128)
1914 LC = RTLIB::SRL_I128;
1916 assert(N->getOpcode() == ISD::SRA && "Unknown shift!");
1919 LC = RTLIB::SRA_I16;
1920 else if (VT == MVT::i32)
1921 LC = RTLIB::SRA_I32;
1922 else if (VT == MVT::i64)
1923 LC = RTLIB::SRA_I64;
1924 else if (VT == MVT::i128)
1925 LC = RTLIB::SRA_I128;
1928 if (LC != RTLIB::UNKNOWN_LIBCALL && TLI.getLibcallName(LC)) {
1929 SDValue Ops[2] = { N->getOperand(0), N->getOperand(1) };
1930 SplitInteger(MakeLibCall(LC, VT, Ops, 2, isSigned, dl), Lo, Hi);
1934 if (!ExpandShiftWithUnknownAmountBit(N, Lo, Hi))
1935 llvm_unreachable("Unsupported shift!");
1938 void DAGTypeLegalizer::ExpandIntRes_SIGN_EXTEND(SDNode *N,
1939 SDValue &Lo, SDValue &Hi) {
1940 EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
1941 DebugLoc dl = N->getDebugLoc();
1942 SDValue Op = N->getOperand(0);
1943 if (Op.getValueType().bitsLE(NVT)) {
1944 // The low part is sign extension of the input (degenerates to a copy).
1945 Lo = DAG.getNode(ISD::SIGN_EXTEND, dl, NVT, N->getOperand(0));
1946 // The high part is obtained by SRA'ing all but one of the bits of low part.
1947 unsigned LoSize = NVT.getSizeInBits();
1948 Hi = DAG.getNode(ISD::SRA, dl, NVT, Lo,
1949 DAG.getConstant(LoSize-1, TLI.getPointerTy()));
1951 // For example, extension of an i48 to an i64. The operand type necessarily
1952 // promotes to the result type, so will end up being expanded too.
1953 assert(getTypeAction(Op.getValueType()) == PromoteInteger &&
1954 "Only know how to promote this result!");
1955 SDValue Res = GetPromotedInteger(Op);
1956 assert(Res.getValueType() == N->getValueType(0) &&
1957 "Operand over promoted?");
1958 // Split the promoted operand. This will simplify when it is expanded.
1959 SplitInteger(Res, Lo, Hi);
1960 unsigned ExcessBits =
1961 Op.getValueType().getSizeInBits() - NVT.getSizeInBits();
1962 Hi = DAG.getNode(ISD::SIGN_EXTEND_INREG, dl, Hi.getValueType(), Hi,
1963 DAG.getValueType(EVT::getIntegerVT(*DAG.getContext(),
1968 void DAGTypeLegalizer::
1969 ExpandIntRes_SIGN_EXTEND_INREG(SDNode *N, SDValue &Lo, SDValue &Hi) {
1970 DebugLoc dl = N->getDebugLoc();
1971 GetExpandedInteger(N->getOperand(0), Lo, Hi);
1972 EVT EVT = cast<VTSDNode>(N->getOperand(1))->getVT();
1974 if (EVT.bitsLE(Lo.getValueType())) {
1975 // sext_inreg the low part if needed.
1976 Lo = DAG.getNode(ISD::SIGN_EXTEND_INREG, dl, Lo.getValueType(), Lo,
1979 // The high part gets the sign extension from the lo-part. This handles
1980 // things like sextinreg V:i64 from i8.
1981 Hi = DAG.getNode(ISD::SRA, dl, Hi.getValueType(), Lo,
1982 DAG.getConstant(Hi.getValueType().getSizeInBits()-1,
1983 TLI.getPointerTy()));
1985 // For example, extension of an i48 to an i64. Leave the low part alone,
1986 // sext_inreg the high part.
1987 unsigned ExcessBits =
1988 EVT.getSizeInBits() - Lo.getValueType().getSizeInBits();
1989 Hi = DAG.getNode(ISD::SIGN_EXTEND_INREG, dl, Hi.getValueType(), Hi,
1990 DAG.getValueType(EVT::getIntegerVT(*DAG.getContext(),
1995 void DAGTypeLegalizer::ExpandIntRes_SREM(SDNode *N,
1996 SDValue &Lo, SDValue &Hi) {
1997 EVT VT = N->getValueType(0);
1998 DebugLoc dl = N->getDebugLoc();
2000 RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
2002 LC = RTLIB::SREM_I16;
2003 else if (VT == MVT::i32)
2004 LC = RTLIB::SREM_I32;
2005 else if (VT == MVT::i64)
2006 LC = RTLIB::SREM_I64;
2007 else if (VT == MVT::i128)
2008 LC = RTLIB::SREM_I128;
2009 assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unsupported SREM!");
2011 SDValue Ops[2] = { N->getOperand(0), N->getOperand(1) };
2012 SplitInteger(MakeLibCall(LC, VT, Ops, 2, true, dl), Lo, Hi);
2015 void DAGTypeLegalizer::ExpandIntRes_TRUNCATE(SDNode *N,
2016 SDValue &Lo, SDValue &Hi) {
2017 EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
2018 DebugLoc dl = N->getDebugLoc();
2019 Lo = DAG.getNode(ISD::TRUNCATE, dl, NVT, N->getOperand(0));
2020 Hi = DAG.getNode(ISD::SRL, dl,
2021 N->getOperand(0).getValueType(), N->getOperand(0),
2022 DAG.getConstant(NVT.getSizeInBits(), TLI.getPointerTy()));
2023 Hi = DAG.getNode(ISD::TRUNCATE, dl, NVT, Hi);
2026 void DAGTypeLegalizer::ExpandIntRes_UADDSUBO(SDNode *N,
2027 SDValue &Lo, SDValue &Hi) {
2028 SDValue LHS = N->getOperand(0);
2029 SDValue RHS = N->getOperand(1);
2030 DebugLoc dl = N->getDebugLoc();
2032 // Expand the result by simply replacing it with the equivalent
2033 // non-overflow-checking operation.
2034 SDValue Sum = DAG.getNode(N->getOpcode() == ISD::UADDO ?
2035 ISD::ADD : ISD::SUB, dl, LHS.getValueType(),
2037 SplitInteger(Sum, Lo, Hi);
2039 // Calculate the overflow: addition overflows iff a + b < a, and subtraction
2040 // overflows iff a - b > a.
2041 SDValue Ofl = DAG.getSetCC(dl, N->getValueType(1), Sum, LHS,
2042 N->getOpcode () == ISD::UADDO ?
2043 ISD::SETULT : ISD::SETUGT);
2045 // Use the calculated overflow everywhere.
2046 ReplaceValueWith(SDValue(N, 1), Ofl);
2049 void DAGTypeLegalizer::ExpandIntRes_UDIV(SDNode *N,
2050 SDValue &Lo, SDValue &Hi) {
2051 EVT VT = N->getValueType(0);
2052 DebugLoc dl = N->getDebugLoc();
2054 RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
2056 LC = RTLIB::UDIV_I16;
2057 else if (VT == MVT::i32)
2058 LC = RTLIB::UDIV_I32;
2059 else if (VT == MVT::i64)
2060 LC = RTLIB::UDIV_I64;
2061 else if (VT == MVT::i128)
2062 LC = RTLIB::UDIV_I128;
2063 assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unsupported UDIV!");
2065 SDValue Ops[2] = { N->getOperand(0), N->getOperand(1) };
2066 SplitInteger(MakeLibCall(LC, VT, Ops, 2, false, dl), Lo, Hi);
2069 void DAGTypeLegalizer::ExpandIntRes_UREM(SDNode *N,
2070 SDValue &Lo, SDValue &Hi) {
2071 EVT VT = N->getValueType(0);
2072 DebugLoc dl = N->getDebugLoc();
2074 RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
2076 LC = RTLIB::UREM_I16;
2077 else if (VT == MVT::i32)
2078 LC = RTLIB::UREM_I32;
2079 else if (VT == MVT::i64)
2080 LC = RTLIB::UREM_I64;
2081 else if (VT == MVT::i128)
2082 LC = RTLIB::UREM_I128;
2083 assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unsupported UREM!");
2085 SDValue Ops[2] = { N->getOperand(0), N->getOperand(1) };
2086 SplitInteger(MakeLibCall(LC, VT, Ops, 2, false, dl), Lo, Hi);
2089 void DAGTypeLegalizer::ExpandIntRes_ZERO_EXTEND(SDNode *N,
2090 SDValue &Lo, SDValue &Hi) {
2091 EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
2092 DebugLoc dl = N->getDebugLoc();
2093 SDValue Op = N->getOperand(0);
2094 if (Op.getValueType().bitsLE(NVT)) {
2095 // The low part is zero extension of the input (degenerates to a copy).
2096 Lo = DAG.getNode(ISD::ZERO_EXTEND, dl, NVT, N->getOperand(0));
2097 Hi = DAG.getConstant(0, NVT); // The high part is just a zero.
2099 // For example, extension of an i48 to an i64. The operand type necessarily
2100 // promotes to the result type, so will end up being expanded too.
2101 assert(getTypeAction(Op.getValueType()) == PromoteInteger &&
2102 "Only know how to promote this result!");
2103 SDValue Res = GetPromotedInteger(Op);
2104 assert(Res.getValueType() == N->getValueType(0) &&
2105 "Operand over promoted?");
2106 // Split the promoted operand. This will simplify when it is expanded.
2107 SplitInteger(Res, Lo, Hi);
2108 unsigned ExcessBits =
2109 Op.getValueType().getSizeInBits() - NVT.getSizeInBits();
2110 Hi = DAG.getZeroExtendInReg(Hi, dl,
2111 EVT::getIntegerVT(*DAG.getContext(),
2117 //===----------------------------------------------------------------------===//
2118 // Integer Operand Expansion
2119 //===----------------------------------------------------------------------===//
2121 /// ExpandIntegerOperand - This method is called when the specified operand of
2122 /// the specified node is found to need expansion. At this point, all of the
2123 /// result types of the node are known to be legal, but other operands of the
2124 /// node may need promotion or expansion as well as the specified one.
2125 bool DAGTypeLegalizer::ExpandIntegerOperand(SDNode *N, unsigned OpNo) {
2126 DEBUG(dbgs() << "Expand integer operand: "; N->dump(&DAG); dbgs() << "\n");
2127 SDValue Res = SDValue();
2129 if (CustomLowerNode(N, N->getOperand(OpNo).getValueType(), false))
2132 switch (N->getOpcode()) {
2135 dbgs() << "ExpandIntegerOperand Op #" << OpNo << ": ";
2136 N->dump(&DAG); dbgs() << "\n";
2138 llvm_unreachable("Do not know how to expand this operator's operand!");
2140 case ISD::BITCAST: Res = ExpandOp_BITCAST(N); break;
2141 case ISD::BR_CC: Res = ExpandIntOp_BR_CC(N); break;
2142 case ISD::BUILD_VECTOR: Res = ExpandOp_BUILD_VECTOR(N); break;
2143 case ISD::EXTRACT_ELEMENT: Res = ExpandOp_EXTRACT_ELEMENT(N); break;
2144 case ISD::INSERT_VECTOR_ELT: Res = ExpandOp_INSERT_VECTOR_ELT(N); break;
2145 case ISD::SCALAR_TO_VECTOR: Res = ExpandOp_SCALAR_TO_VECTOR(N); break;
2146 case ISD::SELECT_CC: Res = ExpandIntOp_SELECT_CC(N); break;
2147 case ISD::SETCC: Res = ExpandIntOp_SETCC(N); break;
2148 case ISD::SINT_TO_FP: Res = ExpandIntOp_SINT_TO_FP(N); break;
2149 case ISD::STORE: Res = ExpandIntOp_STORE(cast<StoreSDNode>(N), OpNo); break;
2150 case ISD::TRUNCATE: Res = ExpandIntOp_TRUNCATE(N); break;
2151 case ISD::UINT_TO_FP: Res = ExpandIntOp_UINT_TO_FP(N); break;
2157 case ISD::ROTR: Res = ExpandIntOp_Shift(N); break;
2158 case ISD::RETURNADDR:
2159 case ISD::FRAMEADDR: Res = ExpandIntOp_RETURNADDR(N); break;
2162 // If the result is null, the sub-method took care of registering results etc.
2163 if (!Res.getNode()) return false;
2165 // If the result is N, the sub-method updated N in place. Tell the legalizer
2167 if (Res.getNode() == N)
2170 assert(Res.getValueType() == N->getValueType(0) && N->getNumValues() == 1 &&
2171 "Invalid operand expansion");
2173 ReplaceValueWith(SDValue(N, 0), Res);
2177 /// IntegerExpandSetCCOperands - Expand the operands of a comparison. This code
2178 /// is shared among BR_CC, SELECT_CC, and SETCC handlers.
2179 void DAGTypeLegalizer::IntegerExpandSetCCOperands(SDValue &NewLHS,
2181 ISD::CondCode &CCCode,
2183 SDValue LHSLo, LHSHi, RHSLo, RHSHi;
2184 GetExpandedInteger(NewLHS, LHSLo, LHSHi);
2185 GetExpandedInteger(NewRHS, RHSLo, RHSHi);
2187 if (CCCode == ISD::SETEQ || CCCode == ISD::SETNE) {
2188 if (RHSLo == RHSHi) {
2189 if (ConstantSDNode *RHSCST = dyn_cast<ConstantSDNode>(RHSLo)) {
2190 if (RHSCST->isAllOnesValue()) {
2191 // Equality comparison to -1.
2192 NewLHS = DAG.getNode(ISD::AND, dl,
2193 LHSLo.getValueType(), LHSLo, LHSHi);
2200 NewLHS = DAG.getNode(ISD::XOR, dl, LHSLo.getValueType(), LHSLo, RHSLo);
2201 NewRHS = DAG.getNode(ISD::XOR, dl, LHSLo.getValueType(), LHSHi, RHSHi);
2202 NewLHS = DAG.getNode(ISD::OR, dl, NewLHS.getValueType(), NewLHS, NewRHS);
2203 NewRHS = DAG.getConstant(0, NewLHS.getValueType());
2207 // If this is a comparison of the sign bit, just look at the top part.
2209 if (ConstantSDNode *CST = dyn_cast<ConstantSDNode>(NewRHS))
2210 if ((CCCode == ISD::SETLT && CST->isNullValue()) || // X < 0
2211 (CCCode == ISD::SETGT && CST->isAllOnesValue())) { // X > -1
2217 // FIXME: This generated code sucks.
2218 ISD::CondCode LowCC;
2220 default: llvm_unreachable("Unknown integer setcc!");
2222 case ISD::SETULT: LowCC = ISD::SETULT; break;
2224 case ISD::SETUGT: LowCC = ISD::SETUGT; break;
2226 case ISD::SETULE: LowCC = ISD::SETULE; break;
2228 case ISD::SETUGE: LowCC = ISD::SETUGE; break;
2231 // Tmp1 = lo(op1) < lo(op2) // Always unsigned comparison
2232 // Tmp2 = hi(op1) < hi(op2) // Signedness depends on operands
2233 // dest = hi(op1) == hi(op2) ? Tmp1 : Tmp2;
2235 // NOTE: on targets without efficient SELECT of bools, we can always use
2236 // this identity: (B1 ? B2 : B3) --> (B1 & B2)|(!B1&B3)
2237 TargetLowering::DAGCombinerInfo DagCombineInfo(DAG, false, true, true, NULL);
2239 Tmp1 = TLI.SimplifySetCC(TLI.getSetCCResultType(LHSLo.getValueType()),
2240 LHSLo, RHSLo, LowCC, false, DagCombineInfo, dl);
2241 if (!Tmp1.getNode())
2242 Tmp1 = DAG.getSetCC(dl, TLI.getSetCCResultType(LHSLo.getValueType()),
2243 LHSLo, RHSLo, LowCC);
2244 Tmp2 = TLI.SimplifySetCC(TLI.getSetCCResultType(LHSHi.getValueType()),
2245 LHSHi, RHSHi, CCCode, false, DagCombineInfo, dl);
2246 if (!Tmp2.getNode())
2247 Tmp2 = DAG.getNode(ISD::SETCC, dl,
2248 TLI.getSetCCResultType(LHSHi.getValueType()),
2249 LHSHi, RHSHi, DAG.getCondCode(CCCode));
2251 ConstantSDNode *Tmp1C = dyn_cast<ConstantSDNode>(Tmp1.getNode());
2252 ConstantSDNode *Tmp2C = dyn_cast<ConstantSDNode>(Tmp2.getNode());
2253 if ((Tmp1C && Tmp1C->isNullValue()) ||
2254 (Tmp2C && Tmp2C->isNullValue() &&
2255 (CCCode == ISD::SETLE || CCCode == ISD::SETGE ||
2256 CCCode == ISD::SETUGE || CCCode == ISD::SETULE)) ||
2257 (Tmp2C && Tmp2C->getAPIntValue() == 1 &&
2258 (CCCode == ISD::SETLT || CCCode == ISD::SETGT ||
2259 CCCode == ISD::SETUGT || CCCode == ISD::SETULT))) {
2260 // low part is known false, returns high part.
2261 // For LE / GE, if high part is known false, ignore the low part.
2262 // For LT / GT, if high part is known true, ignore the low part.
2268 NewLHS = TLI.SimplifySetCC(TLI.getSetCCResultType(LHSHi.getValueType()),
2269 LHSHi, RHSHi, ISD::SETEQ, false,
2270 DagCombineInfo, dl);
2271 if (!NewLHS.getNode())
2272 NewLHS = DAG.getSetCC(dl, TLI.getSetCCResultType(LHSHi.getValueType()),
2273 LHSHi, RHSHi, ISD::SETEQ);
2274 NewLHS = DAG.getNode(ISD::SELECT, dl, Tmp1.getValueType(),
2275 NewLHS, Tmp1, Tmp2);
2279 SDValue DAGTypeLegalizer::ExpandIntOp_BR_CC(SDNode *N) {
2280 SDValue NewLHS = N->getOperand(2), NewRHS = N->getOperand(3);
2281 ISD::CondCode CCCode = cast<CondCodeSDNode>(N->getOperand(1))->get();
2282 IntegerExpandSetCCOperands(NewLHS, NewRHS, CCCode, N->getDebugLoc());
2284 // If ExpandSetCCOperands returned a scalar, we need to compare the result
2285 // against zero to select between true and false values.
2286 if (NewRHS.getNode() == 0) {
2287 NewRHS = DAG.getConstant(0, NewLHS.getValueType());
2288 CCCode = ISD::SETNE;
2291 // Update N to have the operands specified.
2292 return SDValue(DAG.UpdateNodeOperands(N, N->getOperand(0),
2293 DAG.getCondCode(CCCode), NewLHS, NewRHS,
2294 N->getOperand(4)), 0);
2297 SDValue DAGTypeLegalizer::ExpandIntOp_SELECT_CC(SDNode *N) {
2298 SDValue NewLHS = N->getOperand(0), NewRHS = N->getOperand(1);
2299 ISD::CondCode CCCode = cast<CondCodeSDNode>(N->getOperand(4))->get();
2300 IntegerExpandSetCCOperands(NewLHS, NewRHS, CCCode, N->getDebugLoc());
2302 // If ExpandSetCCOperands returned a scalar, we need to compare the result
2303 // against zero to select between true and false values.
2304 if (NewRHS.getNode() == 0) {
2305 NewRHS = DAG.getConstant(0, NewLHS.getValueType());
2306 CCCode = ISD::SETNE;
2309 // Update N to have the operands specified.
2310 return SDValue(DAG.UpdateNodeOperands(N, NewLHS, NewRHS,
2311 N->getOperand(2), N->getOperand(3),
2312 DAG.getCondCode(CCCode)), 0);
2315 SDValue DAGTypeLegalizer::ExpandIntOp_SETCC(SDNode *N) {
2316 SDValue NewLHS = N->getOperand(0), NewRHS = N->getOperand(1);
2317 ISD::CondCode CCCode = cast<CondCodeSDNode>(N->getOperand(2))->get();
2318 IntegerExpandSetCCOperands(NewLHS, NewRHS, CCCode, N->getDebugLoc());
2320 // If ExpandSetCCOperands returned a scalar, use it.
2321 if (NewRHS.getNode() == 0) {
2322 assert(NewLHS.getValueType() == N->getValueType(0) &&
2323 "Unexpected setcc expansion!");
2327 // Otherwise, update N to have the operands specified.
2328 return SDValue(DAG.UpdateNodeOperands(N, NewLHS, NewRHS,
2329 DAG.getCondCode(CCCode)), 0);
2332 SDValue DAGTypeLegalizer::ExpandIntOp_Shift(SDNode *N) {
2333 // The value being shifted is legal, but the shift amount is too big.
2334 // It follows that either the result of the shift is undefined, or the
2335 // upper half of the shift amount is zero. Just use the lower half.
2337 GetExpandedInteger(N->getOperand(1), Lo, Hi);
2338 return SDValue(DAG.UpdateNodeOperands(N, N->getOperand(0), Lo), 0);
2341 SDValue DAGTypeLegalizer::ExpandIntOp_RETURNADDR(SDNode *N) {
2342 // The argument of RETURNADDR / FRAMEADDR builtin is 32 bit contant. This
2343 // surely makes pretty nice problems on 8/16 bit targets. Just truncate this
2344 // constant to valid type.
2346 GetExpandedInteger(N->getOperand(0), Lo, Hi);
2347 return SDValue(DAG.UpdateNodeOperands(N, Lo), 0);
2350 SDValue DAGTypeLegalizer::ExpandIntOp_SINT_TO_FP(SDNode *N) {
2351 SDValue Op = N->getOperand(0);
2352 EVT DstVT = N->getValueType(0);
2353 RTLIB::Libcall LC = RTLIB::getSINTTOFP(Op.getValueType(), DstVT);
2354 assert(LC != RTLIB::UNKNOWN_LIBCALL &&
2355 "Don't know how to expand this SINT_TO_FP!");
2356 return MakeLibCall(LC, DstVT, &Op, 1, true, N->getDebugLoc());
2359 SDValue DAGTypeLegalizer::ExpandIntOp_STORE(StoreSDNode *N, unsigned OpNo) {
2360 if (ISD::isNormalStore(N))
2361 return ExpandOp_NormalStore(N, OpNo);
2363 assert(ISD::isUNINDEXEDStore(N) && "Indexed store during type legalization!");
2364 assert(OpNo == 1 && "Can only expand the stored value so far");
2366 EVT VT = N->getOperand(1).getValueType();
2367 EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), VT);
2368 SDValue Ch = N->getChain();
2369 SDValue Ptr = N->getBasePtr();
2370 unsigned Alignment = N->getAlignment();
2371 bool isVolatile = N->isVolatile();
2372 bool isNonTemporal = N->isNonTemporal();
2373 DebugLoc dl = N->getDebugLoc();
2376 assert(NVT.isByteSized() && "Expanded type not byte sized!");
2378 if (N->getMemoryVT().bitsLE(NVT)) {
2379 GetExpandedInteger(N->getValue(), Lo, Hi);
2380 return DAG.getTruncStore(Ch, dl, Lo, Ptr, N->getPointerInfo(),
2381 N->getMemoryVT(), isVolatile, isNonTemporal,
2385 if (TLI.isLittleEndian()) {
2386 // Little-endian - low bits are at low addresses.
2387 GetExpandedInteger(N->getValue(), Lo, Hi);
2389 Lo = DAG.getStore(Ch, dl, Lo, Ptr, N->getPointerInfo(),
2390 isVolatile, isNonTemporal, Alignment);
2392 unsigned ExcessBits =
2393 N->getMemoryVT().getSizeInBits() - NVT.getSizeInBits();
2394 EVT NEVT = EVT::getIntegerVT(*DAG.getContext(), ExcessBits);
2396 // Increment the pointer to the other half.
2397 unsigned IncrementSize = NVT.getSizeInBits()/8;
2398 Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr,
2399 DAG.getIntPtrConstant(IncrementSize));
2400 Hi = DAG.getTruncStore(Ch, dl, Hi, Ptr,
2401 N->getPointerInfo().getWithOffset(IncrementSize),
2402 NEVT, isVolatile, isNonTemporal,
2403 MinAlign(Alignment, IncrementSize));
2404 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Lo, Hi);
2407 // Big-endian - high bits are at low addresses. Favor aligned stores at
2408 // the cost of some bit-fiddling.
2409 GetExpandedInteger(N->getValue(), Lo, Hi);
2411 EVT ExtVT = N->getMemoryVT();
2412 unsigned EBytes = ExtVT.getStoreSize();
2413 unsigned IncrementSize = NVT.getSizeInBits()/8;
2414 unsigned ExcessBits = (EBytes - IncrementSize)*8;
2415 EVT HiVT = EVT::getIntegerVT(*DAG.getContext(),
2416 ExtVT.getSizeInBits() - ExcessBits);
2418 if (ExcessBits < NVT.getSizeInBits()) {
2419 // Transfer high bits from the top of Lo to the bottom of Hi.
2420 Hi = DAG.getNode(ISD::SHL, dl, NVT, Hi,
2421 DAG.getConstant(NVT.getSizeInBits() - ExcessBits,
2422 TLI.getPointerTy()));
2423 Hi = DAG.getNode(ISD::OR, dl, NVT, Hi,
2424 DAG.getNode(ISD::SRL, dl, NVT, Lo,
2425 DAG.getConstant(ExcessBits,
2426 TLI.getPointerTy())));
2429 // Store both the high bits and maybe some of the low bits.
2430 Hi = DAG.getTruncStore(Ch, dl, Hi, Ptr, N->getPointerInfo(),
2431 HiVT, isVolatile, isNonTemporal, Alignment);
2433 // Increment the pointer to the other half.
2434 Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr,
2435 DAG.getIntPtrConstant(IncrementSize));
2436 // Store the lowest ExcessBits bits in the second half.
2437 Lo = DAG.getTruncStore(Ch, dl, Lo, Ptr,
2438 N->getPointerInfo().getWithOffset(IncrementSize),
2439 EVT::getIntegerVT(*DAG.getContext(), ExcessBits),
2440 isVolatile, isNonTemporal,
2441 MinAlign(Alignment, IncrementSize));
2442 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Lo, Hi);
2445 SDValue DAGTypeLegalizer::ExpandIntOp_TRUNCATE(SDNode *N) {
2447 GetExpandedInteger(N->getOperand(0), InL, InH);
2448 // Just truncate the low part of the source.
2449 return DAG.getNode(ISD::TRUNCATE, N->getDebugLoc(), N->getValueType(0), InL);
2452 static const fltSemantics *EVTToAPFloatSemantics(EVT VT) {
2453 switch (VT.getSimpleVT().SimpleTy) {
2454 default: llvm_unreachable("Unknown FP format");
2455 case MVT::f32: return &APFloat::IEEEsingle;
2456 case MVT::f64: return &APFloat::IEEEdouble;
2457 case MVT::f80: return &APFloat::x87DoubleExtended;
2458 case MVT::f128: return &APFloat::IEEEquad;
2459 case MVT::ppcf128: return &APFloat::PPCDoubleDouble;
2463 SDValue DAGTypeLegalizer::ExpandIntOp_UINT_TO_FP(SDNode *N) {
2464 SDValue Op = N->getOperand(0);
2465 EVT SrcVT = Op.getValueType();
2466 EVT DstVT = N->getValueType(0);
2467 DebugLoc dl = N->getDebugLoc();
2469 // The following optimization is valid only if every value in SrcVT (when
2470 // treated as signed) is representable in DstVT. Check that the mantissa
2471 // size of DstVT is >= than the number of bits in SrcVT -1.
2472 const fltSemantics *sem = EVTToAPFloatSemantics(DstVT);
2473 if (APFloat::semanticsPrecision(*sem) >= SrcVT.getSizeInBits()-1 &&
2474 TLI.getOperationAction(ISD::SINT_TO_FP, SrcVT) == TargetLowering::Custom){
2475 // Do a signed conversion then adjust the result.
2476 SDValue SignedConv = DAG.getNode(ISD::SINT_TO_FP, dl, DstVT, Op);
2477 SignedConv = TLI.LowerOperation(SignedConv, DAG);
2479 // The result of the signed conversion needs adjusting if the 'sign bit' of
2480 // the incoming integer was set. To handle this, we dynamically test to see
2481 // if it is set, and, if so, add a fudge factor.
2483 const uint64_t F32TwoE32 = 0x4F800000ULL;
2484 const uint64_t F32TwoE64 = 0x5F800000ULL;
2485 const uint64_t F32TwoE128 = 0x7F800000ULL;
2488 if (SrcVT == MVT::i32)
2489 FF = APInt(32, F32TwoE32);
2490 else if (SrcVT == MVT::i64)
2491 FF = APInt(32, F32TwoE64);
2492 else if (SrcVT == MVT::i128)
2493 FF = APInt(32, F32TwoE128);
2495 assert(false && "Unsupported UINT_TO_FP!");
2497 // Check whether the sign bit is set.
2499 GetExpandedInteger(Op, Lo, Hi);
2500 SDValue SignSet = DAG.getSetCC(dl,
2501 TLI.getSetCCResultType(Hi.getValueType()),
2502 Hi, DAG.getConstant(0, Hi.getValueType()),
2505 // Build a 64 bit pair (0, FF) in the constant pool, with FF in the lo bits.
2506 SDValue FudgePtr = DAG.getConstantPool(
2507 ConstantInt::get(*DAG.getContext(), FF.zext(64)),
2508 TLI.getPointerTy());
2510 // Get a pointer to FF if the sign bit was set, or to 0 otherwise.
2511 SDValue Zero = DAG.getIntPtrConstant(0);
2512 SDValue Four = DAG.getIntPtrConstant(4);
2513 if (TLI.isBigEndian()) std::swap(Zero, Four);
2514 SDValue Offset = DAG.getNode(ISD::SELECT, dl, Zero.getValueType(), SignSet,
2516 unsigned Alignment = cast<ConstantPoolSDNode>(FudgePtr)->getAlignment();
2517 FudgePtr = DAG.getNode(ISD::ADD, dl, TLI.getPointerTy(), FudgePtr, Offset);
2518 Alignment = std::min(Alignment, 4u);
2520 // Load the value out, extending it from f32 to the destination float type.
2521 // FIXME: Avoid the extend by constructing the right constant pool?
2522 SDValue Fudge = DAG.getExtLoad(ISD::EXTLOAD, DstVT, dl, DAG.getEntryNode(),
2524 MachinePointerInfo::getConstantPool(),
2526 false, false, Alignment);
2527 return DAG.getNode(ISD::FADD, dl, DstVT, SignedConv, Fudge);
2530 // Otherwise, use a libcall.
2531 RTLIB::Libcall LC = RTLIB::getUINTTOFP(SrcVT, DstVT);
2532 assert(LC != RTLIB::UNKNOWN_LIBCALL &&
2533 "Don't know how to expand this UINT_TO_FP!");
2534 return MakeLibCall(LC, DstVT, &Op, 1, true, dl);