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"
24 //===----------------------------------------------------------------------===//
25 // Integer Result Promotion
26 //===----------------------------------------------------------------------===//
28 /// PromoteIntegerResult - This method is called when a result of a node is
29 /// found to be in need of promotion to a larger type. At this point, the node
30 /// may also have invalid operands or may have other results that need
31 /// expansion, we just know that (at least) one result needs promotion.
32 void DAGTypeLegalizer::PromoteIntegerResult(SDNode *N, unsigned ResNo) {
33 DEBUG(cerr << "Promote integer result: "; N->dump(&DAG); cerr << "\n");
34 SDValue Result = SDValue();
36 // See if the target wants to custom expand this node.
37 if (CustomLowerResults(N, ResNo))
40 switch (N->getOpcode()) {
43 cerr << "PromoteIntegerResult #" << ResNo << ": ";
44 N->dump(&DAG); cerr << "\n";
46 assert(0 && "Do not know how to promote this operator!");
48 case ISD::AssertSext: Result = PromoteIntRes_AssertSext(N); break;
49 case ISD::AssertZext: Result = PromoteIntRes_AssertZext(N); break;
50 case ISD::BIT_CONVERT: Result = PromoteIntRes_BIT_CONVERT(N); break;
51 case ISD::BSWAP: Result = PromoteIntRes_BSWAP(N); break;
52 case ISD::BUILD_PAIR: Result = PromoteIntRes_BUILD_PAIR(N); break;
53 case ISD::Constant: Result = PromoteIntRes_Constant(N); break;
54 case ISD::CONVERT_RNDSAT:
55 Result = PromoteIntRes_CONVERT_RNDSAT(N); break;
56 case ISD::CTLZ: Result = PromoteIntRes_CTLZ(N); break;
57 case ISD::CTPOP: Result = PromoteIntRes_CTPOP(N); break;
58 case ISD::CTTZ: Result = PromoteIntRes_CTTZ(N); break;
59 case ISD::EXTRACT_VECTOR_ELT:
60 Result = PromoteIntRes_EXTRACT_VECTOR_ELT(N); break;
61 case ISD::LOAD: Result = PromoteIntRes_LOAD(cast<LoadSDNode>(N));break;
62 case ISD::SELECT: Result = PromoteIntRes_SELECT(N); break;
63 case ISD::SELECT_CC: Result = PromoteIntRes_SELECT_CC(N); break;
64 case ISD::SETCC: Result = PromoteIntRes_SETCC(N); break;
65 case ISD::SHL: Result = PromoteIntRes_SHL(N); break;
66 case ISD::SIGN_EXTEND_INREG:
67 Result = PromoteIntRes_SIGN_EXTEND_INREG(N); break;
68 case ISD::SRA: Result = PromoteIntRes_SRA(N); break;
69 case ISD::SRL: Result = PromoteIntRes_SRL(N); break;
70 case ISD::TRUNCATE: Result = PromoteIntRes_TRUNCATE(N); break;
71 case ISD::UNDEF: Result = PromoteIntRes_UNDEF(N); break;
72 case ISD::VAARG: Result = PromoteIntRes_VAARG(N); break;
74 case ISD::SIGN_EXTEND:
75 case ISD::ZERO_EXTEND:
76 case ISD::ANY_EXTEND: Result = PromoteIntRes_INT_EXTEND(N); break;
79 case ISD::FP_TO_UINT: Result = PromoteIntRes_FP_TO_XINT(N); break;
86 case ISD::MUL: Result = PromoteIntRes_SimpleIntBinOp(N); break;
89 case ISD::SREM: Result = PromoteIntRes_SDIV(N); break;
92 case ISD::UREM: Result = PromoteIntRes_UDIV(N); break;
95 case ISD::SSUBO: Result = PromoteIntRes_SADDSUBO(N, ResNo); break;
97 case ISD::USUBO: Result = PromoteIntRes_UADDSUBO(N, ResNo); break;
99 case ISD::UMULO: Result = PromoteIntRes_XMULO(N, ResNo); break;
101 case ISD::ATOMIC_LOAD_ADD_8:
102 case ISD::ATOMIC_LOAD_SUB_8:
103 case ISD::ATOMIC_LOAD_AND_8:
104 case ISD::ATOMIC_LOAD_OR_8:
105 case ISD::ATOMIC_LOAD_XOR_8:
106 case ISD::ATOMIC_LOAD_NAND_8:
107 case ISD::ATOMIC_LOAD_MIN_8:
108 case ISD::ATOMIC_LOAD_MAX_8:
109 case ISD::ATOMIC_LOAD_UMIN_8:
110 case ISD::ATOMIC_LOAD_UMAX_8:
111 case ISD::ATOMIC_SWAP_8:
112 case ISD::ATOMIC_LOAD_ADD_16:
113 case ISD::ATOMIC_LOAD_SUB_16:
114 case ISD::ATOMIC_LOAD_AND_16:
115 case ISD::ATOMIC_LOAD_OR_16:
116 case ISD::ATOMIC_LOAD_XOR_16:
117 case ISD::ATOMIC_LOAD_NAND_16:
118 case ISD::ATOMIC_LOAD_MIN_16:
119 case ISD::ATOMIC_LOAD_MAX_16:
120 case ISD::ATOMIC_LOAD_UMIN_16:
121 case ISD::ATOMIC_LOAD_UMAX_16:
122 case ISD::ATOMIC_SWAP_16:
123 case ISD::ATOMIC_LOAD_ADD_32:
124 case ISD::ATOMIC_LOAD_SUB_32:
125 case ISD::ATOMIC_LOAD_AND_32:
126 case ISD::ATOMIC_LOAD_OR_32:
127 case ISD::ATOMIC_LOAD_XOR_32:
128 case ISD::ATOMIC_LOAD_NAND_32:
129 case ISD::ATOMIC_LOAD_MIN_32:
130 case ISD::ATOMIC_LOAD_MAX_32:
131 case ISD::ATOMIC_LOAD_UMIN_32:
132 case ISD::ATOMIC_LOAD_UMAX_32:
133 case ISD::ATOMIC_SWAP_32:
134 case ISD::ATOMIC_LOAD_ADD_64:
135 case ISD::ATOMIC_LOAD_SUB_64:
136 case ISD::ATOMIC_LOAD_AND_64:
137 case ISD::ATOMIC_LOAD_OR_64:
138 case ISD::ATOMIC_LOAD_XOR_64:
139 case ISD::ATOMIC_LOAD_NAND_64:
140 case ISD::ATOMIC_LOAD_MIN_64:
141 case ISD::ATOMIC_LOAD_MAX_64:
142 case ISD::ATOMIC_LOAD_UMIN_64:
143 case ISD::ATOMIC_LOAD_UMAX_64:
144 case ISD::ATOMIC_SWAP_64:
145 Result = PromoteIntRes_Atomic1(cast<AtomicSDNode>(N)); break;
147 case ISD::ATOMIC_CMP_SWAP_8:
148 case ISD::ATOMIC_CMP_SWAP_16:
149 case ISD::ATOMIC_CMP_SWAP_32:
150 case ISD::ATOMIC_CMP_SWAP_64:
151 Result = PromoteIntRes_Atomic2(cast<AtomicSDNode>(N)); break;
154 // If Result is null, the sub-method took care of registering the result.
155 if (Result.getNode())
156 SetPromotedInteger(SDValue(N, ResNo), Result);
159 SDValue DAGTypeLegalizer::PromoteIntRes_AssertSext(SDNode *N) {
160 // Sign-extend the new bits, and continue the assertion.
161 SDValue Op = SExtPromotedInteger(N->getOperand(0));
162 return DAG.getNode(ISD::AssertSext, Op.getValueType(), Op, N->getOperand(1));
165 SDValue DAGTypeLegalizer::PromoteIntRes_AssertZext(SDNode *N) {
166 // Zero the new bits, and continue the assertion.
167 SDValue Op = ZExtPromotedInteger(N->getOperand(0));
168 return DAG.getNode(ISD::AssertZext, Op.getValueType(), Op, N->getOperand(1));
171 SDValue DAGTypeLegalizer::PromoteIntRes_Atomic1(AtomicSDNode *N) {
172 SDValue Op2 = GetPromotedInteger(N->getOperand(2));
173 SDValue Res = DAG.getAtomic(N->getOpcode(), N->getChain(), N->getBasePtr(),
174 Op2, N->getSrcValue(), N->getAlignment());
175 // Legalized the chain result - switch anything that used the old chain to
177 ReplaceValueWith(SDValue(N, 1), Res.getValue(1));
181 SDValue DAGTypeLegalizer::PromoteIntRes_Atomic2(AtomicSDNode *N) {
182 SDValue Op2 = GetPromotedInteger(N->getOperand(2));
183 SDValue Op3 = GetPromotedInteger(N->getOperand(3));
184 SDValue Res = DAG.getAtomic(N->getOpcode(), N->getChain(), N->getBasePtr(),
185 Op2, Op3, N->getSrcValue(), N->getAlignment());
186 // Legalized the chain result - switch anything that used the old chain to
188 ReplaceValueWith(SDValue(N, 1), Res.getValue(1));
192 SDValue DAGTypeLegalizer::PromoteIntRes_BIT_CONVERT(SDNode *N) {
193 SDValue InOp = N->getOperand(0);
194 MVT InVT = InOp.getValueType();
195 MVT NInVT = TLI.getTypeToTransformTo(InVT);
196 MVT OutVT = N->getValueType(0);
197 MVT NOutVT = TLI.getTypeToTransformTo(OutVT);
199 switch (getTypeAction(InVT)) {
201 assert(false && "Unknown type action!");
206 if (NOutVT.bitsEq(NInVT))
207 // The input promotes to the same size. Convert the promoted value.
208 return DAG.getNode(ISD::BIT_CONVERT, NOutVT, GetPromotedInteger(InOp));
211 // Promote the integer operand by hand.
212 return DAG.getNode(ISD::ANY_EXTEND, NOutVT, GetSoftenedFloat(InOp));
216 case ScalarizeVector:
217 // Convert the element to an integer and promote it by hand.
218 return DAG.getNode(ISD::ANY_EXTEND, NOutVT,
219 BitConvertToInteger(GetScalarizedVector(InOp)));
221 // For example, i32 = BIT_CONVERT v2i16 on alpha. Convert the split
222 // pieces of the input into integers and reassemble in the final type.
224 GetSplitVector(N->getOperand(0), Lo, Hi);
225 Lo = BitConvertToInteger(Lo);
226 Hi = BitConvertToInteger(Hi);
228 if (TLI.isBigEndian())
231 InOp = DAG.getNode(ISD::ANY_EXTEND,
232 MVT::getIntegerVT(NOutVT.getSizeInBits()),
233 JoinIntegers(Lo, Hi));
234 return DAG.getNode(ISD::BIT_CONVERT, NOutVT, InOp);
237 // Otherwise, lower the bit-convert to a store/load from the stack.
239 // Create the stack frame object. Make sure it is aligned for both
240 // the source and destination types.
241 SDValue FIPtr = DAG.CreateStackTemporary(InVT, OutVT);
243 // Emit a store to the stack slot.
244 SDValue Store = DAG.getStore(DAG.getEntryNode(), InOp, FIPtr, NULL, 0);
246 // Result is an extending load from the stack slot.
247 return DAG.getExtLoad(ISD::EXTLOAD, NOutVT, Store, FIPtr, NULL, 0, OutVT);
250 SDValue DAGTypeLegalizer::PromoteIntRes_BSWAP(SDNode *N) {
251 SDValue Op = GetPromotedInteger(N->getOperand(0));
252 MVT OVT = N->getValueType(0);
253 MVT NVT = Op.getValueType();
255 unsigned DiffBits = NVT.getSizeInBits() - OVT.getSizeInBits();
256 return DAG.getNode(ISD::SRL, NVT, DAG.getNode(ISD::BSWAP, NVT, Op),
257 DAG.getConstant(DiffBits, TLI.getShiftAmountTy()));
260 SDValue DAGTypeLegalizer::PromoteIntRes_BUILD_PAIR(SDNode *N) {
261 // The pair element type may be legal, or may not promote to the same type as
262 // the result, for example i14 = BUILD_PAIR (i7, i7). Handle all cases.
263 return DAG.getNode(ISD::ANY_EXTEND,
264 TLI.getTypeToTransformTo(N->getValueType(0)),
265 JoinIntegers(N->getOperand(0), N->getOperand(1)));
268 SDValue DAGTypeLegalizer::PromoteIntRes_Constant(SDNode *N) {
269 MVT VT = N->getValueType(0);
270 // Zero extend things like i1, sign extend everything else. It shouldn't
271 // matter in theory which one we pick, but this tends to give better code?
272 unsigned Opc = VT.isByteSized() ? ISD::SIGN_EXTEND : ISD::ZERO_EXTEND;
273 SDValue Result = DAG.getNode(Opc, TLI.getTypeToTransformTo(VT),
275 assert(isa<ConstantSDNode>(Result) && "Didn't constant fold ext?");
279 SDValue DAGTypeLegalizer::PromoteIntRes_CONVERT_RNDSAT(SDNode *N) {
280 ISD::CvtCode CvtCode = cast<CvtRndSatSDNode>(N)->getCvtCode();
281 assert ((CvtCode == ISD::CVT_SS || CvtCode == ISD::CVT_SU ||
282 CvtCode == ISD::CVT_US || CvtCode == ISD::CVT_UU ||
283 CvtCode == ISD::CVT_SF || CvtCode == ISD::CVT_UF) &&
284 "can only promote integers");
285 MVT OutVT = TLI.getTypeToTransformTo(N->getValueType(0));
286 return DAG.getConvertRndSat(OutVT, N->getOperand(0),
287 N->getOperand(1), N->getOperand(2),
288 N->getOperand(3), N->getOperand(4), CvtCode);
291 SDValue DAGTypeLegalizer::PromoteIntRes_CTLZ(SDNode *N) {
292 // Zero extend to the promoted type and do the count there.
293 SDValue Op = ZExtPromotedInteger(N->getOperand(0));
294 MVT OVT = N->getValueType(0);
295 MVT NVT = Op.getValueType();
296 Op = DAG.getNode(ISD::CTLZ, NVT, Op);
297 // Subtract off the extra leading bits in the bigger type.
298 return DAG.getNode(ISD::SUB, NVT, Op,
299 DAG.getConstant(NVT.getSizeInBits() -
300 OVT.getSizeInBits(), NVT));
303 SDValue DAGTypeLegalizer::PromoteIntRes_CTPOP(SDNode *N) {
304 // Zero extend to the promoted type and do the count there.
305 SDValue Op = ZExtPromotedInteger(N->getOperand(0));
306 return DAG.getNode(ISD::CTPOP, Op.getValueType(), Op);
309 SDValue DAGTypeLegalizer::PromoteIntRes_CTTZ(SDNode *N) {
310 SDValue Op = GetPromotedInteger(N->getOperand(0));
311 MVT OVT = N->getValueType(0);
312 MVT NVT = Op.getValueType();
313 // The count is the same in the promoted type except if the original
314 // value was zero. This can be handled by setting the bit just off
315 // the top of the original type.
316 APInt TopBit(NVT.getSizeInBits(), 0);
317 TopBit.set(OVT.getSizeInBits());
318 Op = DAG.getNode(ISD::OR, NVT, Op, DAG.getConstant(TopBit, NVT));
319 return DAG.getNode(ISD::CTTZ, NVT, Op);
322 SDValue DAGTypeLegalizer::PromoteIntRes_EXTRACT_VECTOR_ELT(SDNode *N) {
323 MVT OldVT = N->getValueType(0);
324 SDValue OldVec = N->getOperand(0);
325 unsigned OldElts = OldVec.getValueType().getVectorNumElements();
328 assert(!isTypeLegal(OldVec.getValueType()) &&
329 "Legal one-element vector of a type needing promotion!");
330 // It is tempting to follow GetScalarizedVector by a call to
331 // GetPromotedInteger, but this would be wrong because the
332 // scalarized value may not yet have been processed.
333 return DAG.getNode(ISD::ANY_EXTEND, TLI.getTypeToTransformTo(OldVT),
334 GetScalarizedVector(OldVec));
337 // Convert to a vector half as long with an element type of twice the width,
338 // for example <4 x i16> -> <2 x i32>.
339 assert(!(OldElts & 1) && "Odd length vectors not supported!");
340 MVT NewVT = MVT::getIntegerVT(2 * OldVT.getSizeInBits());
341 assert(OldVT.isSimple() && NewVT.isSimple());
343 SDValue NewVec = DAG.getNode(ISD::BIT_CONVERT,
344 MVT::getVectorVT(NewVT, OldElts / 2),
347 // Extract the element at OldIdx / 2 from the new vector.
348 SDValue OldIdx = N->getOperand(1);
349 SDValue NewIdx = DAG.getNode(ISD::SRL, OldIdx.getValueType(), OldIdx,
350 DAG.getConstant(1, TLI.getShiftAmountTy()));
351 SDValue Elt = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, NewVT, NewVec, NewIdx);
353 // Select the appropriate half of the element: Lo if OldIdx was even,
356 SDValue Hi = DAG.getNode(ISD::SRL, NewVT, Elt,
357 DAG.getConstant(OldVT.getSizeInBits(),
358 TLI.getShiftAmountTy()));
359 if (TLI.isBigEndian())
362 // Signed extend to the promoted type.
363 SDValue Odd = DAG.getNode(ISD::TRUNCATE, MVT::i1, OldIdx);
364 SDValue Res = DAG.getNode(ISD::SELECT, NewVT, Odd, Hi, Lo);
365 return DAG.getNode(ISD::ANY_EXTEND, TLI.getTypeToTransformTo(OldVT), Res);
368 SDValue DAGTypeLegalizer::PromoteIntRes_FP_TO_XINT(SDNode *N) {
369 MVT NVT = TLI.getTypeToTransformTo(N->getValueType(0));
370 unsigned NewOpc = N->getOpcode();
372 // If we're promoting a UINT to a larger size, check to see if the new node
373 // will be legal. If it isn't, check to see if FP_TO_SINT is legal, since
374 // we can use that instead. This allows us to generate better code for
375 // FP_TO_UINT for small destination sizes on targets where FP_TO_UINT is not
376 // legal, such as PowerPC.
377 if (N->getOpcode() == ISD::FP_TO_UINT &&
378 !TLI.isOperationLegal(ISD::FP_TO_UINT, NVT) &&
379 TLI.isOperationLegal(ISD::FP_TO_SINT, NVT))
380 NewOpc = ISD::FP_TO_SINT;
382 SDValue Res = DAG.getNode(NewOpc, NVT, N->getOperand(0));
384 // Assert that the converted value fits in the original type. If it doesn't
385 // (eg: because the value being converted is too big), then the result of the
386 // original operation was undefined anyway, so the assert is still correct.
387 return DAG.getNode(N->getOpcode() == ISD::FP_TO_UINT ?
388 ISD::AssertZext : ISD::AssertSext,
389 NVT, Res, DAG.getValueType(N->getValueType(0)));
392 SDValue DAGTypeLegalizer::PromoteIntRes_INT_EXTEND(SDNode *N) {
393 MVT NVT = TLI.getTypeToTransformTo(N->getValueType(0));
395 if (getTypeAction(N->getOperand(0).getValueType()) == PromoteInteger) {
396 SDValue Res = GetPromotedInteger(N->getOperand(0));
397 assert(Res.getValueType().bitsLE(NVT) && "Extension doesn't make sense!");
399 // If the result and operand types are the same after promotion, simplify
400 // to an in-register extension.
401 if (NVT == Res.getValueType()) {
402 // The high bits are not guaranteed to be anything. Insert an extend.
403 if (N->getOpcode() == ISD::SIGN_EXTEND)
404 return DAG.getNode(ISD::SIGN_EXTEND_INREG, NVT, Res,
405 DAG.getValueType(N->getOperand(0).getValueType()));
406 if (N->getOpcode() == ISD::ZERO_EXTEND)
407 return DAG.getZeroExtendInReg(Res, N->getOperand(0).getValueType());
408 assert(N->getOpcode() == ISD::ANY_EXTEND && "Unknown integer extension!");
413 // Otherwise, just extend the original operand all the way to the larger type.
414 return DAG.getNode(N->getOpcode(), NVT, N->getOperand(0));
417 SDValue DAGTypeLegalizer::PromoteIntRes_LOAD(LoadSDNode *N) {
418 assert(ISD::isUNINDEXEDLoad(N) && "Indexed load during type legalization!");
419 MVT NVT = TLI.getTypeToTransformTo(N->getValueType(0));
420 ISD::LoadExtType ExtType =
421 ISD::isNON_EXTLoad(N) ? ISD::EXTLOAD : N->getExtensionType();
422 SDValue Res = DAG.getExtLoad(ExtType, NVT, N->getChain(), N->getBasePtr(),
423 N->getSrcValue(), N->getSrcValueOffset(),
424 N->getMemoryVT(), N->isVolatile(),
427 // Legalized the chain result - switch anything that used the old chain to
429 ReplaceValueWith(SDValue(N, 1), Res.getValue(1));
433 /// Promote the overflow flag of an overflowing arithmetic node.
434 SDValue DAGTypeLegalizer::PromoteIntRes_Overflow(SDNode *N) {
435 // Simply change the return type of the boolean result.
436 MVT NVT = TLI.getTypeToTransformTo(N->getValueType(1));
437 MVT ValueVTs[] = { N->getValueType(0), NVT };
438 SDValue Ops[] = { N->getOperand(0), N->getOperand(1) };
439 SDValue Res = DAG.getNode(N->getOpcode(), DAG.getVTList(ValueVTs, 2), Ops, 2);
441 // Modified the sum result - switch anything that used the old sum to use
443 ReplaceValueWith(SDValue(N, 0), Res);
445 return SDValue(Res.getNode(), 1);
448 SDValue DAGTypeLegalizer::PromoteIntRes_SADDSUBO(SDNode *N, unsigned ResNo) {
450 return PromoteIntRes_Overflow(N);
452 // The operation overflowed iff the result in the larger type is not the
453 // sign extension of its truncation to the original type.
454 SDValue LHS = SExtPromotedInteger(N->getOperand(0));
455 SDValue RHS = SExtPromotedInteger(N->getOperand(1));
456 MVT OVT = N->getOperand(0).getValueType();
457 MVT NVT = LHS.getValueType();
459 // Do the arithmetic in the larger type.
460 unsigned Opcode = N->getOpcode() == ISD::SADDO ? ISD::ADD : ISD::SUB;
461 SDValue Res = DAG.getNode(Opcode, NVT, LHS, RHS);
463 // Calculate the overflow flag: sign extend the arithmetic result from
464 // the original type.
465 SDValue Ofl = DAG.getNode(ISD::SIGN_EXTEND_INREG, NVT, Res,
466 DAG.getValueType(OVT));
467 // Overflowed if and only if this is not equal to Res.
468 Ofl = DAG.getSetCC(N->getValueType(1), Ofl, Res, ISD::SETNE);
470 // Use the calculated overflow everywhere.
471 ReplaceValueWith(SDValue(N, 1), Ofl);
476 SDValue DAGTypeLegalizer::PromoteIntRes_SDIV(SDNode *N) {
477 // Sign extend the input.
478 SDValue LHS = SExtPromotedInteger(N->getOperand(0));
479 SDValue RHS = SExtPromotedInteger(N->getOperand(1));
480 return DAG.getNode(N->getOpcode(), LHS.getValueType(), LHS, RHS);
483 SDValue DAGTypeLegalizer::PromoteIntRes_SELECT(SDNode *N) {
484 SDValue LHS = GetPromotedInteger(N->getOperand(1));
485 SDValue RHS = GetPromotedInteger(N->getOperand(2));
486 return DAG.getNode(ISD::SELECT, LHS.getValueType(), N->getOperand(0),LHS,RHS);
489 SDValue DAGTypeLegalizer::PromoteIntRes_SELECT_CC(SDNode *N) {
490 SDValue LHS = GetPromotedInteger(N->getOperand(2));
491 SDValue RHS = GetPromotedInteger(N->getOperand(3));
492 return DAG.getNode(ISD::SELECT_CC, LHS.getValueType(), N->getOperand(0),
493 N->getOperand(1), LHS, RHS, N->getOperand(4));
496 SDValue DAGTypeLegalizer::PromoteIntRes_SETCC(SDNode *N) {
497 MVT SVT = TLI.getSetCCResultType(N->getOperand(0));
498 assert(isTypeLegal(SVT) && "Illegal SetCC type!");
500 // Get the SETCC result using the canonical SETCC type.
501 SDValue SetCC = DAG.getNode(ISD::SETCC, SVT, N->getOperand(0),
502 N->getOperand(1), N->getOperand(2));
504 // Convert to the expected type.
505 MVT NVT = TLI.getTypeToTransformTo(N->getValueType(0));
506 assert(NVT.bitsLE(SVT) && "Integer type overpromoted?");
507 return DAG.getNode(ISD::TRUNCATE, NVT, SetCC);
510 SDValue DAGTypeLegalizer::PromoteIntRes_SHL(SDNode *N) {
511 return DAG.getNode(ISD::SHL, TLI.getTypeToTransformTo(N->getValueType(0)),
512 GetPromotedInteger(N->getOperand(0)), N->getOperand(1));
515 SDValue DAGTypeLegalizer::PromoteIntRes_SIGN_EXTEND_INREG(SDNode *N) {
516 SDValue Op = GetPromotedInteger(N->getOperand(0));
517 return DAG.getNode(ISD::SIGN_EXTEND_INREG, Op.getValueType(), Op,
521 SDValue DAGTypeLegalizer::PromoteIntRes_SimpleIntBinOp(SDNode *N) {
522 // The input may have strange things in the top bits of the registers, but
523 // these operations don't care. They may have weird bits going out, but
524 // that too is okay if they are integer operations.
525 SDValue LHS = GetPromotedInteger(N->getOperand(0));
526 SDValue RHS = GetPromotedInteger(N->getOperand(1));
527 return DAG.getNode(N->getOpcode(), LHS.getValueType(), LHS, RHS);
530 SDValue DAGTypeLegalizer::PromoteIntRes_SRA(SDNode *N) {
531 // The input value must be properly sign extended.
532 SDValue Res = SExtPromotedInteger(N->getOperand(0));
533 return DAG.getNode(ISD::SRA, Res.getValueType(), Res, N->getOperand(1));
536 SDValue DAGTypeLegalizer::PromoteIntRes_SRL(SDNode *N) {
537 // The input value must be properly zero extended.
538 MVT VT = N->getValueType(0);
539 MVT NVT = TLI.getTypeToTransformTo(VT);
540 SDValue Res = ZExtPromotedInteger(N->getOperand(0));
541 return DAG.getNode(ISD::SRL, NVT, Res, N->getOperand(1));
544 SDValue DAGTypeLegalizer::PromoteIntRes_TRUNCATE(SDNode *N) {
545 MVT NVT = TLI.getTypeToTransformTo(N->getValueType(0));
548 switch (getTypeAction(N->getOperand(0).getValueType())) {
549 default: assert(0 && "Unknown type action!");
552 Res = N->getOperand(0);
555 Res = GetPromotedInteger(N->getOperand(0));
559 // Truncate to NVT instead of VT
560 return DAG.getNode(ISD::TRUNCATE, NVT, Res);
563 SDValue DAGTypeLegalizer::PromoteIntRes_UADDSUBO(SDNode *N, unsigned ResNo) {
565 return PromoteIntRes_Overflow(N);
567 // The operation overflowed iff the result in the larger type is not the
568 // zero extension of its truncation to the original type.
569 SDValue LHS = ZExtPromotedInteger(N->getOperand(0));
570 SDValue RHS = ZExtPromotedInteger(N->getOperand(1));
571 MVT OVT = N->getOperand(0).getValueType();
572 MVT NVT = LHS.getValueType();
574 // Do the arithmetic in the larger type.
575 unsigned Opcode = N->getOpcode() == ISD::UADDO ? ISD::ADD : ISD::SUB;
576 SDValue Res = DAG.getNode(Opcode, NVT, LHS, RHS);
578 // Calculate the overflow flag: zero extend the arithmetic result from
579 // the original type.
580 SDValue Ofl = DAG.getZeroExtendInReg(Res, OVT);
581 // Overflowed if and only if this is not equal to Res.
582 Ofl = DAG.getSetCC(N->getValueType(1), Ofl, Res, ISD::SETNE);
584 // Use the calculated overflow everywhere.
585 ReplaceValueWith(SDValue(N, 1), Ofl);
590 SDValue DAGTypeLegalizer::PromoteIntRes_UDIV(SDNode *N) {
591 // Zero extend the input.
592 SDValue LHS = ZExtPromotedInteger(N->getOperand(0));
593 SDValue RHS = ZExtPromotedInteger(N->getOperand(1));
594 return DAG.getNode(N->getOpcode(), LHS.getValueType(), LHS, RHS);
597 SDValue DAGTypeLegalizer::PromoteIntRes_UNDEF(SDNode *N) {
598 return DAG.getNode(ISD::UNDEF, TLI.getTypeToTransformTo(N->getValueType(0)));
601 SDValue DAGTypeLegalizer::PromoteIntRes_VAARG(SDNode *N) {
602 SDValue Chain = N->getOperand(0); // Get the chain.
603 SDValue Ptr = N->getOperand(1); // Get the pointer.
604 MVT VT = N->getValueType(0);
606 MVT RegVT = TLI.getRegisterType(VT);
607 unsigned NumRegs = TLI.getNumRegisters(VT);
608 // The argument is passed as NumRegs registers of type RegVT.
610 SmallVector<SDValue, 8> Parts(NumRegs);
611 for (unsigned i = 0; i < NumRegs; ++i) {
612 Parts[i] = DAG.getVAArg(RegVT, Chain, Ptr, N->getOperand(2));
613 Chain = Parts[i].getValue(1);
616 // Handle endianness of the load.
617 if (TLI.isBigEndian())
618 std::reverse(Parts.begin(), Parts.end());
620 // Assemble the parts in the promoted type.
621 MVT NVT = TLI.getTypeToTransformTo(N->getValueType(0));
622 SDValue Res = DAG.getNode(ISD::ZERO_EXTEND, NVT, Parts[0]);
623 for (unsigned i = 1; i < NumRegs; ++i) {
624 SDValue Part = DAG.getNode(ISD::ZERO_EXTEND, NVT, Parts[i]);
625 // Shift it to the right position and "or" it in.
626 Part = DAG.getNode(ISD::SHL, NVT, Part,
627 DAG.getConstant(i * RegVT.getSizeInBits(),
628 TLI.getShiftAmountTy()));
629 Res = DAG.getNode(ISD::OR, NVT, Res, Part);
632 // Modified the chain result - switch anything that used the old chain to
634 ReplaceValueWith(SDValue(N, 1), Chain);
639 SDValue DAGTypeLegalizer::PromoteIntRes_XMULO(SDNode *N, unsigned ResNo) {
640 assert(ResNo == 1 && "Only boolean result promotion currently supported!");
641 return PromoteIntRes_Overflow(N);
644 //===----------------------------------------------------------------------===//
645 // Integer Operand Promotion
646 //===----------------------------------------------------------------------===//
648 /// PromoteIntegerOperand - This method is called when the specified operand of
649 /// the specified node is found to need promotion. At this point, all of the
650 /// result types of the node are known to be legal, but other operands of the
651 /// node may need promotion or expansion as well as the specified one.
652 bool DAGTypeLegalizer::PromoteIntegerOperand(SDNode *N, unsigned OpNo) {
653 DEBUG(cerr << "Promote integer operand: "; N->dump(&DAG); cerr << "\n");
654 SDValue Res = SDValue();
656 if (TLI.getOperationAction(N->getOpcode(), N->getOperand(OpNo).getValueType())
657 == TargetLowering::Custom)
658 Res = TLI.LowerOperation(SDValue(N, 0), DAG);
660 if (Res.getNode() == 0) {
661 switch (N->getOpcode()) {
664 cerr << "PromoteIntegerOperand Op #" << OpNo << ": ";
665 N->dump(&DAG); cerr << "\n";
667 assert(0 && "Do not know how to promote this operator's operand!");
670 case ISD::ANY_EXTEND: Res = PromoteIntOp_ANY_EXTEND(N); break;
671 case ISD::BR_CC: Res = PromoteIntOp_BR_CC(N, OpNo); break;
672 case ISD::BRCOND: Res = PromoteIntOp_BRCOND(N, OpNo); break;
673 case ISD::BUILD_PAIR: Res = PromoteIntOp_BUILD_PAIR(N); break;
674 case ISD::BUILD_VECTOR: Res = PromoteIntOp_BUILD_VECTOR(N); break;
675 case ISD::CONVERT_RNDSAT:
676 Res = PromoteIntOp_CONVERT_RNDSAT(N); break;
677 case ISD::INSERT_VECTOR_ELT:
678 Res = PromoteIntOp_INSERT_VECTOR_ELT(N, OpNo);break;
679 case ISD::MEMBARRIER: Res = PromoteIntOp_MEMBARRIER(N); break;
680 case ISD::SELECT: Res = PromoteIntOp_SELECT(N, OpNo); break;
681 case ISD::SELECT_CC: Res = PromoteIntOp_SELECT_CC(N, OpNo); break;
682 case ISD::SETCC: Res = PromoteIntOp_SETCC(N, OpNo); break;
683 case ISD::SIGN_EXTEND: Res = PromoteIntOp_SIGN_EXTEND(N); break;
684 case ISD::SINT_TO_FP: Res = PromoteIntOp_SINT_TO_FP(N); break;
685 case ISD::STORE: Res = PromoteIntOp_STORE(cast<StoreSDNode>(N),
687 case ISD::TRUNCATE: Res = PromoteIntOp_TRUNCATE(N); break;
688 case ISD::UINT_TO_FP: Res = PromoteIntOp_UINT_TO_FP(N); break;
689 case ISD::ZERO_EXTEND: Res = PromoteIntOp_ZERO_EXTEND(N); break;
693 // If the result is null, the sub-method took care of registering results etc.
694 if (!Res.getNode()) return false;
696 // If the result is N, the sub-method updated N in place. Tell the legalizer
698 if (Res.getNode() == N)
701 assert(Res.getValueType() == N->getValueType(0) && N->getNumValues() == 1 &&
702 "Invalid operand expansion");
704 ReplaceValueWith(SDValue(N, 0), Res);
708 /// PromoteSetCCOperands - Promote the operands of a comparison. This code is
709 /// shared among BR_CC, SELECT_CC, and SETCC handlers.
710 void DAGTypeLegalizer::PromoteSetCCOperands(SDValue &NewLHS,SDValue &NewRHS,
711 ISD::CondCode CCCode) {
712 // We have to insert explicit sign or zero extends. Note that we could
713 // insert sign extends for ALL conditions, but zero extend is cheaper on
714 // many machines (an AND instead of two shifts), so prefer it.
716 default: assert(0 && "Unknown integer comparison!");
723 // ALL of these operations will work if we either sign or zero extend
724 // the operands (including the unsigned comparisons!). Zero extend is
725 // usually a simpler/cheaper operation, so prefer it.
726 NewLHS = ZExtPromotedInteger(NewLHS);
727 NewRHS = ZExtPromotedInteger(NewRHS);
733 NewLHS = SExtPromotedInteger(NewLHS);
734 NewRHS = SExtPromotedInteger(NewRHS);
739 SDValue DAGTypeLegalizer::PromoteIntOp_ANY_EXTEND(SDNode *N) {
740 SDValue Op = GetPromotedInteger(N->getOperand(0));
741 return DAG.getNode(ISD::ANY_EXTEND, N->getValueType(0), Op);
744 SDValue DAGTypeLegalizer::PromoteIntOp_BR_CC(SDNode *N, unsigned OpNo) {
745 assert(OpNo == 2 && "Don't know how to promote this operand!");
747 SDValue LHS = N->getOperand(2);
748 SDValue RHS = N->getOperand(3);
749 PromoteSetCCOperands(LHS, RHS, cast<CondCodeSDNode>(N->getOperand(1))->get());
751 // The chain (Op#0), CC (#1) and basic block destination (Op#4) are always
753 return DAG.UpdateNodeOperands(SDValue(N, 0), N->getOperand(0),
754 N->getOperand(1), LHS, RHS, N->getOperand(4));
757 SDValue DAGTypeLegalizer::PromoteIntOp_BRCOND(SDNode *N, unsigned OpNo) {
758 assert(OpNo == 1 && "only know how to promote condition");
759 SDValue Cond = GetPromotedInteger(N->getOperand(1)); // Promote condition.
761 // Make sure the extra bits coming from type promotion conform to
762 // getBooleanContents.
763 unsigned CondBits = Cond.getValueSizeInBits();
764 switch (TLI.getBooleanContents()) {
766 assert(false && "Unknown BooleanContent!");
767 case TargetLowering::UndefinedBooleanContent:
768 // The promoted value, which may contain rubbish in the upper bits, is fine.
770 case TargetLowering::ZeroOrOneBooleanContent:
771 if (!DAG.MaskedValueIsZero(Cond,APInt::getHighBitsSet(CondBits,CondBits-1)))
772 Cond = DAG.getZeroExtendInReg(Cond, MVT::i1);
774 case TargetLowering::ZeroOrNegativeOneBooleanContent:
775 if (DAG.ComputeNumSignBits(Cond) != CondBits)
776 Cond = DAG.getNode(ISD::SIGN_EXTEND_INREG, Cond.getValueType(), Cond,
777 DAG.getValueType(MVT::i1));
781 // The chain (Op#0) and basic block destination (Op#2) are always legal types.
782 return DAG.UpdateNodeOperands(SDValue(N, 0), N->getOperand(0), Cond,
786 SDValue DAGTypeLegalizer::PromoteIntOp_BUILD_PAIR(SDNode *N) {
787 // Since the result type is legal, the operands must promote to it.
788 MVT OVT = N->getOperand(0).getValueType();
789 SDValue Lo = ZExtPromotedInteger(N->getOperand(0));
790 SDValue Hi = GetPromotedInteger(N->getOperand(1));
791 assert(Lo.getValueType() == N->getValueType(0) && "Operand over promoted?");
793 Hi = DAG.getNode(ISD::SHL, N->getValueType(0), Hi,
794 DAG.getConstant(OVT.getSizeInBits(),
795 TLI.getShiftAmountTy()));
796 return DAG.getNode(ISD::OR, N->getValueType(0), Lo, Hi);
799 SDValue DAGTypeLegalizer::PromoteIntOp_BUILD_VECTOR(SDNode *N) {
800 // The vector type is legal but the element type is not. This implies
801 // that the vector is a power-of-two in length and that the element
802 // type does not have a strange size (eg: it is not i1).
803 MVT VecVT = N->getValueType(0);
804 unsigned NumElts = VecVT.getVectorNumElements();
805 assert(!(NumElts & 1) && "Legal vector of one illegal element?");
807 // Build a vector of half the length out of elements of twice the bitwidth.
808 // For example <4 x i16> -> <2 x i32>.
809 MVT OldVT = N->getOperand(0).getValueType();
810 MVT NewVT = MVT::getIntegerVT(2 * OldVT.getSizeInBits());
811 assert(OldVT.isSimple() && NewVT.isSimple());
813 std::vector<SDValue> NewElts;
814 NewElts.reserve(NumElts/2);
816 for (unsigned i = 0; i < NumElts; i += 2) {
817 // Combine two successive elements into one promoted element.
818 SDValue Lo = N->getOperand(i);
819 SDValue Hi = N->getOperand(i+1);
820 if (TLI.isBigEndian())
822 NewElts.push_back(JoinIntegers(Lo, Hi));
825 SDValue NewVec = DAG.getNode(ISD::BUILD_VECTOR,
826 MVT::getVectorVT(NewVT, NewElts.size()),
827 &NewElts[0], NewElts.size());
829 // Convert the new vector to the old vector type.
830 return DAG.getNode(ISD::BIT_CONVERT, VecVT, NewVec);
833 SDValue DAGTypeLegalizer::PromoteIntOp_CONVERT_RNDSAT(SDNode *N) {
834 ISD::CvtCode CvtCode = cast<CvtRndSatSDNode>(N)->getCvtCode();
835 assert ((CvtCode == ISD::CVT_SS || CvtCode == ISD::CVT_SU ||
836 CvtCode == ISD::CVT_US || CvtCode == ISD::CVT_UU ||
837 CvtCode == ISD::CVT_FS || CvtCode == ISD::CVT_FU) &&
838 "can only promote integer arguments");
839 SDValue InOp = GetPromotedInteger(N->getOperand(0));
840 return DAG.getConvertRndSat(N->getValueType(0), InOp,
841 N->getOperand(1), N->getOperand(2),
842 N->getOperand(3), N->getOperand(4), CvtCode);
845 SDValue DAGTypeLegalizer::PromoteIntOp_INSERT_VECTOR_ELT(SDNode *N,
848 // Promote the inserted value. This is valid because the type does not
849 // have to match the vector element type.
851 // Check that any extra bits introduced will be truncated away.
852 assert(N->getOperand(1).getValueType().getSizeInBits() >=
853 N->getValueType(0).getVectorElementType().getSizeInBits() &&
854 "Type of inserted value narrower than vector element type!");
855 return DAG.UpdateNodeOperands(SDValue(N, 0), N->getOperand(0),
856 GetPromotedInteger(N->getOperand(1)),
860 assert(OpNo == 2 && "Different operand and result vector types?");
862 // Promote the index.
863 SDValue Idx = ZExtPromotedInteger(N->getOperand(2));
864 return DAG.UpdateNodeOperands(SDValue(N, 0), N->getOperand(0),
865 N->getOperand(1), Idx);
868 SDValue DAGTypeLegalizer::PromoteIntOp_MEMBARRIER(SDNode *N) {
870 NewOps[0] = N->getOperand(0);
871 for (unsigned i = 1; i < array_lengthof(NewOps); ++i) {
872 SDValue Flag = GetPromotedInteger(N->getOperand(i));
873 NewOps[i] = DAG.getZeroExtendInReg(Flag, MVT::i1);
875 return DAG.UpdateNodeOperands(SDValue (N, 0), NewOps,
876 array_lengthof(NewOps));
879 SDValue DAGTypeLegalizer::PromoteIntOp_SELECT(SDNode *N, unsigned OpNo) {
880 assert(OpNo == 0 && "Only know how to promote condition");
881 SDValue Cond = GetPromotedInteger(N->getOperand(0));
883 // Promote all the way up to SVT, the canonical SetCC type.
884 // FIXME: Not clear what value to pass to getSetCCResultType.
885 // [This only matters for CellSPU since all other targets
886 // ignore the argument.] We used to pass Cond, resulting in
887 // SVT = MVT::i8, but CellSPU has no select patterns for i8,
888 // causing an abort later. Passing the result type works
889 // around the problem.
890 MVT SVT = TLI.getSetCCResultType(N->getOperand(1));
891 assert(isTypeLegal(SVT) && "Illegal SetCC type!");
892 assert(Cond.getValueType().bitsLE(SVT) && "Unexpected SetCC type!");
894 // Make sure the extra bits conform to getBooleanContents. There are
895 // two sets of extra bits: those in Cond, which come from type promotion,
896 // and those we need to add to have the final type be SVT (for most targets
897 // this last set of bits is empty).
898 unsigned CondBits = Cond.getValueSizeInBits();
899 ISD::NodeType ExtendCode;
900 switch (TLI.getBooleanContents()) {
902 assert(false && "Unknown BooleanContent!");
903 case TargetLowering::UndefinedBooleanContent:
904 // Extend to SVT by adding rubbish.
905 ExtendCode = ISD::ANY_EXTEND;
907 case TargetLowering::ZeroOrOneBooleanContent:
908 ExtendCode = ISD::ZERO_EXTEND;
909 if (!DAG.MaskedValueIsZero(Cond,APInt::getHighBitsSet(CondBits,CondBits-1)))
910 // All extra bits need to be cleared. Do this by zero extending the
911 // original condition value all the way to SVT.
912 Cond = N->getOperand(0);
914 case TargetLowering::ZeroOrNegativeOneBooleanContent: {
915 ExtendCode = ISD::SIGN_EXTEND;
916 unsigned SignBits = DAG.ComputeNumSignBits(Cond);
917 if (SignBits != CondBits)
918 // All extra bits need to be sign extended. Do this by sign extending the
919 // original condition value all the way to SVT.
920 Cond = N->getOperand(0);
924 Cond = DAG.getNode(ExtendCode, SVT, Cond);
926 return DAG.UpdateNodeOperands(SDValue(N, 0), Cond,
927 N->getOperand(1), N->getOperand(2));
930 SDValue DAGTypeLegalizer::PromoteIntOp_SELECT_CC(SDNode *N, unsigned OpNo) {
931 assert(OpNo == 0 && "Don't know how to promote this operand!");
933 SDValue LHS = N->getOperand(0);
934 SDValue RHS = N->getOperand(1);
935 PromoteSetCCOperands(LHS, RHS, cast<CondCodeSDNode>(N->getOperand(4))->get());
937 // The CC (#4) and the possible return values (#2 and #3) have legal types.
938 return DAG.UpdateNodeOperands(SDValue(N, 0), LHS, RHS, N->getOperand(2),
939 N->getOperand(3), N->getOperand(4));
942 SDValue DAGTypeLegalizer::PromoteIntOp_SETCC(SDNode *N, unsigned OpNo) {
943 assert(OpNo == 0 && "Don't know how to promote this operand!");
945 SDValue LHS = N->getOperand(0);
946 SDValue RHS = N->getOperand(1);
947 PromoteSetCCOperands(LHS, RHS, cast<CondCodeSDNode>(N->getOperand(2))->get());
949 // The CC (#2) is always legal.
950 return DAG.UpdateNodeOperands(SDValue(N, 0), LHS, RHS, N->getOperand(2));
953 SDValue DAGTypeLegalizer::PromoteIntOp_SIGN_EXTEND(SDNode *N) {
954 SDValue Op = GetPromotedInteger(N->getOperand(0));
955 Op = DAG.getNode(ISD::ANY_EXTEND, N->getValueType(0), Op);
956 return DAG.getNode(ISD::SIGN_EXTEND_INREG, Op.getValueType(),
957 Op, DAG.getValueType(N->getOperand(0).getValueType()));
960 SDValue DAGTypeLegalizer::PromoteIntOp_SINT_TO_FP(SDNode *N) {
961 return DAG.UpdateNodeOperands(SDValue(N, 0),
962 SExtPromotedInteger(N->getOperand(0)));
965 SDValue DAGTypeLegalizer::PromoteIntOp_STORE(StoreSDNode *N, unsigned OpNo){
966 assert(ISD::isUNINDEXEDStore(N) && "Indexed store during type legalization!");
967 SDValue Ch = N->getChain(), Ptr = N->getBasePtr();
968 int SVOffset = N->getSrcValueOffset();
969 unsigned Alignment = N->getAlignment();
970 bool isVolatile = N->isVolatile();
972 SDValue Val = GetPromotedInteger(N->getValue()); // Get promoted value.
974 // Truncate the value and store the result.
975 return DAG.getTruncStore(Ch, Val, Ptr, N->getSrcValue(),
976 SVOffset, N->getMemoryVT(),
977 isVolatile, Alignment);
980 SDValue DAGTypeLegalizer::PromoteIntOp_TRUNCATE(SDNode *N) {
981 SDValue Op = GetPromotedInteger(N->getOperand(0));
982 return DAG.getNode(ISD::TRUNCATE, N->getValueType(0), Op);
985 SDValue DAGTypeLegalizer::PromoteIntOp_UINT_TO_FP(SDNode *N) {
986 return DAG.UpdateNodeOperands(SDValue(N, 0),
987 ZExtPromotedInteger(N->getOperand(0)));
990 SDValue DAGTypeLegalizer::PromoteIntOp_ZERO_EXTEND(SDNode *N) {
991 SDValue Op = GetPromotedInteger(N->getOperand(0));
992 Op = DAG.getNode(ISD::ANY_EXTEND, N->getValueType(0), Op);
993 return DAG.getZeroExtendInReg(Op, N->getOperand(0).getValueType());
997 //===----------------------------------------------------------------------===//
998 // Integer Result Expansion
999 //===----------------------------------------------------------------------===//
1001 /// ExpandIntegerResult - This method is called when the specified result of the
1002 /// specified node is found to need expansion. At this point, the node may also
1003 /// have invalid operands or may have other results that need promotion, we just
1004 /// know that (at least) one result needs expansion.
1005 void DAGTypeLegalizer::ExpandIntegerResult(SDNode *N, unsigned ResNo) {
1006 DEBUG(cerr << "Expand integer result: "; N->dump(&DAG); cerr << "\n");
1008 Lo = Hi = SDValue();
1010 // See if the target wants to custom expand this node.
1011 if (CustomLowerResults(N, ResNo))
1014 switch (N->getOpcode()) {
1017 cerr << "ExpandIntegerResult #" << ResNo << ": ";
1018 N->dump(&DAG); cerr << "\n";
1020 assert(0 && "Do not know how to expand the result of this operator!");
1023 case ISD::MERGE_VALUES: SplitRes_MERGE_VALUES(N, Lo, Hi); break;
1024 case ISD::SELECT: SplitRes_SELECT(N, Lo, Hi); break;
1025 case ISD::SELECT_CC: SplitRes_SELECT_CC(N, Lo, Hi); break;
1026 case ISD::UNDEF: SplitRes_UNDEF(N, Lo, Hi); break;
1028 case ISD::BIT_CONVERT: ExpandRes_BIT_CONVERT(N, Lo, Hi); break;
1029 case ISD::BUILD_PAIR: ExpandRes_BUILD_PAIR(N, Lo, Hi); break;
1030 case ISD::EXTRACT_ELEMENT: ExpandRes_EXTRACT_ELEMENT(N, Lo, Hi); break;
1031 case ISD::EXTRACT_VECTOR_ELT: ExpandRes_EXTRACT_VECTOR_ELT(N, Lo, Hi); break;
1032 case ISD::VAARG: ExpandRes_VAARG(N, Lo, Hi); break;
1034 case ISD::ANY_EXTEND: ExpandIntRes_ANY_EXTEND(N, Lo, Hi); break;
1035 case ISD::AssertSext: ExpandIntRes_AssertSext(N, Lo, Hi); break;
1036 case ISD::AssertZext: ExpandIntRes_AssertZext(N, Lo, Hi); break;
1037 case ISD::BSWAP: ExpandIntRes_BSWAP(N, Lo, Hi); break;
1038 case ISD::Constant: ExpandIntRes_Constant(N, Lo, Hi); break;
1039 case ISD::CTLZ: ExpandIntRes_CTLZ(N, Lo, Hi); break;
1040 case ISD::CTPOP: ExpandIntRes_CTPOP(N, Lo, Hi); break;
1041 case ISD::CTTZ: ExpandIntRes_CTTZ(N, Lo, Hi); break;
1042 case ISD::FP_TO_SINT: ExpandIntRes_FP_TO_SINT(N, Lo, Hi); break;
1043 case ISD::FP_TO_UINT: ExpandIntRes_FP_TO_UINT(N, Lo, Hi); break;
1044 case ISD::LOAD: ExpandIntRes_LOAD(cast<LoadSDNode>(N), Lo, Hi); break;
1045 case ISD::MUL: ExpandIntRes_MUL(N, Lo, Hi); break;
1046 case ISD::SDIV: ExpandIntRes_SDIV(N, Lo, Hi); break;
1047 case ISD::SIGN_EXTEND: ExpandIntRes_SIGN_EXTEND(N, Lo, Hi); break;
1048 case ISD::SIGN_EXTEND_INREG: ExpandIntRes_SIGN_EXTEND_INREG(N, Lo, Hi); break;
1049 case ISD::SREM: ExpandIntRes_SREM(N, Lo, Hi); break;
1050 case ISD::TRUNCATE: ExpandIntRes_TRUNCATE(N, Lo, Hi); break;
1051 case ISD::UDIV: ExpandIntRes_UDIV(N, Lo, Hi); break;
1052 case ISD::UREM: ExpandIntRes_UREM(N, Lo, Hi); break;
1053 case ISD::ZERO_EXTEND: ExpandIntRes_ZERO_EXTEND(N, Lo, Hi); break;
1057 case ISD::XOR: ExpandIntRes_Logical(N, Lo, Hi); break;
1060 case ISD::SUB: ExpandIntRes_ADDSUB(N, Lo, Hi); break;
1063 case ISD::SUBC: ExpandIntRes_ADDSUBC(N, Lo, Hi); break;
1066 case ISD::SUBE: ExpandIntRes_ADDSUBE(N, Lo, Hi); break;
1070 case ISD::SRL: ExpandIntRes_Shift(N, Lo, Hi); break;
1073 // If Lo/Hi is null, the sub-method took care of registering results etc.
1075 SetExpandedInteger(SDValue(N, ResNo), Lo, Hi);
1078 /// ExpandShiftByConstant - N is a shift by a value that needs to be expanded,
1079 /// and the shift amount is a constant 'Amt'. Expand the operation.
1080 void DAGTypeLegalizer::ExpandShiftByConstant(SDNode *N, unsigned Amt,
1081 SDValue &Lo, SDValue &Hi) {
1082 // Expand the incoming operand to be shifted, so that we have its parts
1084 GetExpandedInteger(N->getOperand(0), InL, InH);
1086 MVT NVT = InL.getValueType();
1087 unsigned VTBits = N->getValueType(0).getSizeInBits();
1088 unsigned NVTBits = NVT.getSizeInBits();
1089 MVT ShTy = N->getOperand(1).getValueType();
1091 if (N->getOpcode() == ISD::SHL) {
1093 Lo = Hi = DAG.getConstant(0, NVT);
1094 } else if (Amt > NVTBits) {
1095 Lo = DAG.getConstant(0, NVT);
1096 Hi = DAG.getNode(ISD::SHL, NVT, InL, DAG.getConstant(Amt-NVTBits,ShTy));
1097 } else if (Amt == NVTBits) {
1098 Lo = DAG.getConstant(0, NVT);
1100 } else if (Amt == 1 &&
1101 TLI.isOperationLegal(ISD::ADDC, TLI.getTypeToExpandTo(NVT))) {
1102 // Emit this X << 1 as X+X.
1103 SDVTList VTList = DAG.getVTList(NVT, MVT::Flag);
1104 SDValue LoOps[2] = { InL, InL };
1105 Lo = DAG.getNode(ISD::ADDC, VTList, LoOps, 2);
1106 SDValue HiOps[3] = { InH, InH, Lo.getValue(1) };
1107 Hi = DAG.getNode(ISD::ADDE, VTList, HiOps, 3);
1109 Lo = DAG.getNode(ISD::SHL, NVT, InL, DAG.getConstant(Amt, ShTy));
1110 Hi = DAG.getNode(ISD::OR, NVT,
1111 DAG.getNode(ISD::SHL, NVT, InH,
1112 DAG.getConstant(Amt, ShTy)),
1113 DAG.getNode(ISD::SRL, NVT, InL,
1114 DAG.getConstant(NVTBits-Amt, ShTy)));
1119 if (N->getOpcode() == ISD::SRL) {
1121 Lo = DAG.getConstant(0, NVT);
1122 Hi = DAG.getConstant(0, NVT);
1123 } else if (Amt > NVTBits) {
1124 Lo = DAG.getNode(ISD::SRL, NVT, InH, DAG.getConstant(Amt-NVTBits,ShTy));
1125 Hi = DAG.getConstant(0, NVT);
1126 } else if (Amt == NVTBits) {
1128 Hi = DAG.getConstant(0, NVT);
1130 Lo = DAG.getNode(ISD::OR, NVT,
1131 DAG.getNode(ISD::SRL, NVT, InL,
1132 DAG.getConstant(Amt, ShTy)),
1133 DAG.getNode(ISD::SHL, NVT, InH,
1134 DAG.getConstant(NVTBits-Amt, ShTy)));
1135 Hi = DAG.getNode(ISD::SRL, NVT, InH, DAG.getConstant(Amt, ShTy));
1140 assert(N->getOpcode() == ISD::SRA && "Unknown shift!");
1142 Hi = Lo = DAG.getNode(ISD::SRA, NVT, InH,
1143 DAG.getConstant(NVTBits-1, ShTy));
1144 } else if (Amt > NVTBits) {
1145 Lo = DAG.getNode(ISD::SRA, NVT, InH,
1146 DAG.getConstant(Amt-NVTBits, ShTy));
1147 Hi = DAG.getNode(ISD::SRA, NVT, InH,
1148 DAG.getConstant(NVTBits-1, ShTy));
1149 } else if (Amt == NVTBits) {
1151 Hi = DAG.getNode(ISD::SRA, NVT, InH,
1152 DAG.getConstant(NVTBits-1, ShTy));
1154 Lo = DAG.getNode(ISD::OR, NVT,
1155 DAG.getNode(ISD::SRL, NVT, InL,
1156 DAG.getConstant(Amt, ShTy)),
1157 DAG.getNode(ISD::SHL, NVT, InH,
1158 DAG.getConstant(NVTBits-Amt, ShTy)));
1159 Hi = DAG.getNode(ISD::SRA, NVT, InH, DAG.getConstant(Amt, ShTy));
1163 /// ExpandShiftWithKnownAmountBit - Try to determine whether we can simplify
1164 /// this shift based on knowledge of the high bit of the shift amount. If we
1165 /// can tell this, we know that it is >= 32 or < 32, without knowing the actual
1167 bool DAGTypeLegalizer::
1168 ExpandShiftWithKnownAmountBit(SDNode *N, SDValue &Lo, SDValue &Hi) {
1169 SDValue Amt = N->getOperand(1);
1170 MVT NVT = TLI.getTypeToTransformTo(N->getValueType(0));
1171 MVT ShTy = Amt.getValueType();
1172 unsigned ShBits = ShTy.getSizeInBits();
1173 unsigned NVTBits = NVT.getSizeInBits();
1174 assert(isPowerOf2_32(NVTBits) &&
1175 "Expanded integer type size not a power of two!");
1177 APInt HighBitMask = APInt::getHighBitsSet(ShBits, ShBits - Log2_32(NVTBits));
1178 APInt KnownZero, KnownOne;
1179 DAG.ComputeMaskedBits(N->getOperand(1), HighBitMask, KnownZero, KnownOne);
1181 // If we don't know anything about the high bits, exit.
1182 if (((KnownZero|KnownOne) & HighBitMask) == 0)
1185 // Get the incoming operand to be shifted.
1187 GetExpandedInteger(N->getOperand(0), InL, InH);
1189 // If we know that any of the high bits of the shift amount are one, then we
1190 // can do this as a couple of simple shifts.
1191 if (KnownOne.intersects(HighBitMask)) {
1192 // Mask out the high bit, which we know is set.
1193 Amt = DAG.getNode(ISD::AND, ShTy, Amt,
1194 DAG.getConstant(~HighBitMask, ShTy));
1196 switch (N->getOpcode()) {
1197 default: assert(0 && "Unknown shift");
1199 Lo = DAG.getConstant(0, NVT); // Low part is zero.
1200 Hi = DAG.getNode(ISD::SHL, NVT, InL, Amt); // High part from Lo part.
1203 Hi = DAG.getConstant(0, NVT); // Hi part is zero.
1204 Lo = DAG.getNode(ISD::SRL, NVT, InH, Amt); // Lo part from Hi part.
1207 Hi = DAG.getNode(ISD::SRA, NVT, InH, // Sign extend high part.
1208 DAG.getConstant(NVTBits-1, ShTy));
1209 Lo = DAG.getNode(ISD::SRA, NVT, InH, Amt); // Lo part from Hi part.
1214 // If we know that all of the high bits of the shift amount are zero, then we
1215 // can do this as a couple of simple shifts.
1216 if ((KnownZero & HighBitMask) == HighBitMask) {
1218 SDValue Amt2 = DAG.getNode(ISD::SUB, ShTy,
1219 DAG.getConstant(NVTBits, ShTy),
1222 switch (N->getOpcode()) {
1223 default: assert(0 && "Unknown shift");
1224 case ISD::SHL: Op1 = ISD::SHL; Op2 = ISD::SRL; break;
1226 case ISD::SRA: Op1 = ISD::SRL; Op2 = ISD::SHL; break;
1229 Lo = DAG.getNode(N->getOpcode(), NVT, InL, Amt);
1230 Hi = DAG.getNode(ISD::OR, NVT,
1231 DAG.getNode(Op1, NVT, InH, Amt),
1232 DAG.getNode(Op2, NVT, InL, Amt2));
1239 void DAGTypeLegalizer::ExpandIntRes_ADDSUB(SDNode *N,
1240 SDValue &Lo, SDValue &Hi) {
1241 // Expand the subcomponents.
1242 SDValue LHSL, LHSH, RHSL, RHSH;
1243 GetExpandedInteger(N->getOperand(0), LHSL, LHSH);
1244 GetExpandedInteger(N->getOperand(1), RHSL, RHSH);
1246 MVT NVT = LHSL.getValueType();
1247 SDValue LoOps[2] = { LHSL, RHSL };
1248 SDValue HiOps[3] = { LHSH, RHSH };
1250 // Do not generate ADDC/ADDE or SUBC/SUBE if the target does not support
1251 // them. TODO: Teach operation legalization how to expand unsupported
1252 // ADDC/ADDE/SUBC/SUBE. The problem is that these operations generate
1253 // a carry of type MVT::Flag, but there doesn't seem to be any way to
1254 // generate a value of this type in the expanded code sequence.
1256 TLI.isOperationLegal(N->getOpcode() == ISD::ADD ? ISD::ADDC : ISD::SUBC,
1257 TLI.getTypeToExpandTo(NVT));
1260 SDVTList VTList = DAG.getVTList(NVT, MVT::Flag);
1261 if (N->getOpcode() == ISD::ADD) {
1262 Lo = DAG.getNode(ISD::ADDC, VTList, LoOps, 2);
1263 HiOps[2] = Lo.getValue(1);
1264 Hi = DAG.getNode(ISD::ADDE, VTList, HiOps, 3);
1266 Lo = DAG.getNode(ISD::SUBC, VTList, LoOps, 2);
1267 HiOps[2] = Lo.getValue(1);
1268 Hi = DAG.getNode(ISD::SUBE, VTList, HiOps, 3);
1271 if (N->getOpcode() == ISD::ADD) {
1272 Lo = DAG.getNode(ISD::ADD, NVT, LoOps, 2);
1273 Hi = DAG.getNode(ISD::ADD, NVT, HiOps, 2);
1274 SDValue Cmp1 = DAG.getSetCC(TLI.getSetCCResultType(Lo), Lo, LoOps[0],
1276 SDValue Carry1 = DAG.getNode(ISD::SELECT, NVT, Cmp1,
1277 DAG.getConstant(1, NVT),
1278 DAG.getConstant(0, NVT));
1279 SDValue Cmp2 = DAG.getSetCC(TLI.getSetCCResultType(Lo), Lo, LoOps[1],
1281 SDValue Carry2 = DAG.getNode(ISD::SELECT, NVT, Cmp2,
1282 DAG.getConstant(1, NVT), Carry1);
1283 Hi = DAG.getNode(ISD::ADD, NVT, Hi, Carry2);
1285 Lo = DAG.getNode(ISD::SUB, NVT, LoOps, 2);
1286 Hi = DAG.getNode(ISD::SUB, NVT, HiOps, 2);
1287 SDValue Cmp = DAG.getSetCC(TLI.getSetCCResultType(LoOps[0]),
1288 LoOps[0], LoOps[1], ISD::SETULT);
1289 SDValue Borrow = DAG.getNode(ISD::SELECT, NVT, Cmp,
1290 DAG.getConstant(1, NVT),
1291 DAG.getConstant(0, NVT));
1292 Hi = DAG.getNode(ISD::SUB, NVT, Hi, Borrow);
1297 void DAGTypeLegalizer::ExpandIntRes_ADDSUBC(SDNode *N,
1298 SDValue &Lo, SDValue &Hi) {
1299 // Expand the subcomponents.
1300 SDValue LHSL, LHSH, RHSL, RHSH;
1301 GetExpandedInteger(N->getOperand(0), LHSL, LHSH);
1302 GetExpandedInteger(N->getOperand(1), RHSL, RHSH);
1303 SDVTList VTList = DAG.getVTList(LHSL.getValueType(), MVT::Flag);
1304 SDValue LoOps[2] = { LHSL, RHSL };
1305 SDValue HiOps[3] = { LHSH, RHSH };
1307 if (N->getOpcode() == ISD::ADDC) {
1308 Lo = DAG.getNode(ISD::ADDC, VTList, LoOps, 2);
1309 HiOps[2] = Lo.getValue(1);
1310 Hi = DAG.getNode(ISD::ADDE, VTList, HiOps, 3);
1312 Lo = DAG.getNode(ISD::SUBC, VTList, LoOps, 2);
1313 HiOps[2] = Lo.getValue(1);
1314 Hi = DAG.getNode(ISD::SUBE, VTList, HiOps, 3);
1317 // Legalized the flag result - switch anything that used the old flag to
1319 ReplaceValueWith(SDValue(N, 1), Hi.getValue(1));
1322 void DAGTypeLegalizer::ExpandIntRes_ADDSUBE(SDNode *N,
1323 SDValue &Lo, SDValue &Hi) {
1324 // Expand the subcomponents.
1325 SDValue LHSL, LHSH, RHSL, RHSH;
1326 GetExpandedInteger(N->getOperand(0), LHSL, LHSH);
1327 GetExpandedInteger(N->getOperand(1), RHSL, RHSH);
1328 SDVTList VTList = DAG.getVTList(LHSL.getValueType(), MVT::Flag);
1329 SDValue LoOps[3] = { LHSL, RHSL, N->getOperand(2) };
1330 SDValue HiOps[3] = { LHSH, RHSH };
1332 Lo = DAG.getNode(N->getOpcode(), VTList, LoOps, 3);
1333 HiOps[2] = Lo.getValue(1);
1334 Hi = DAG.getNode(N->getOpcode(), VTList, HiOps, 3);
1336 // Legalized the flag result - switch anything that used the old flag to
1338 ReplaceValueWith(SDValue(N, 1), Hi.getValue(1));
1341 void DAGTypeLegalizer::ExpandIntRes_ANY_EXTEND(SDNode *N,
1342 SDValue &Lo, SDValue &Hi) {
1343 MVT NVT = TLI.getTypeToTransformTo(N->getValueType(0));
1344 SDValue Op = N->getOperand(0);
1345 if (Op.getValueType().bitsLE(NVT)) {
1346 // The low part is any extension of the input (which degenerates to a copy).
1347 Lo = DAG.getNode(ISD::ANY_EXTEND, NVT, Op);
1348 Hi = DAG.getNode(ISD::UNDEF, NVT); // The high part is undefined.
1350 // For example, extension of an i48 to an i64. The operand type necessarily
1351 // promotes to the result type, so will end up being expanded too.
1352 assert(getTypeAction(Op.getValueType()) == PromoteInteger &&
1353 "Only know how to promote this result!");
1354 SDValue Res = GetPromotedInteger(Op);
1355 assert(Res.getValueType() == N->getValueType(0) &&
1356 "Operand over promoted?");
1357 // Split the promoted operand. This will simplify when it is expanded.
1358 SplitInteger(Res, Lo, Hi);
1362 void DAGTypeLegalizer::ExpandIntRes_AssertSext(SDNode *N,
1363 SDValue &Lo, SDValue &Hi) {
1364 GetExpandedInteger(N->getOperand(0), Lo, Hi);
1365 MVT NVT = Lo.getValueType();
1366 MVT EVT = cast<VTSDNode>(N->getOperand(1))->getVT();
1367 unsigned NVTBits = NVT.getSizeInBits();
1368 unsigned EVTBits = EVT.getSizeInBits();
1370 if (NVTBits < EVTBits) {
1371 Hi = DAG.getNode(ISD::AssertSext, NVT, Hi,
1372 DAG.getValueType(MVT::getIntegerVT(EVTBits - NVTBits)));
1374 Lo = DAG.getNode(ISD::AssertSext, NVT, Lo, DAG.getValueType(EVT));
1375 // The high part replicates the sign bit of Lo, make it explicit.
1376 Hi = DAG.getNode(ISD::SRA, NVT, Lo,
1377 DAG.getConstant(NVTBits-1, TLI.getShiftAmountTy()));
1381 void DAGTypeLegalizer::ExpandIntRes_AssertZext(SDNode *N,
1382 SDValue &Lo, SDValue &Hi) {
1383 GetExpandedInteger(N->getOperand(0), Lo, Hi);
1384 MVT NVT = Lo.getValueType();
1385 MVT EVT = cast<VTSDNode>(N->getOperand(1))->getVT();
1386 unsigned NVTBits = NVT.getSizeInBits();
1387 unsigned EVTBits = EVT.getSizeInBits();
1389 if (NVTBits < EVTBits) {
1390 Hi = DAG.getNode(ISD::AssertZext, NVT, Hi,
1391 DAG.getValueType(MVT::getIntegerVT(EVTBits - NVTBits)));
1393 Lo = DAG.getNode(ISD::AssertZext, NVT, Lo, DAG.getValueType(EVT));
1394 // The high part must be zero, make it explicit.
1395 Hi = DAG.getConstant(0, NVT);
1399 void DAGTypeLegalizer::ExpandIntRes_BSWAP(SDNode *N,
1400 SDValue &Lo, SDValue &Hi) {
1401 GetExpandedInteger(N->getOperand(0), Hi, Lo); // Note swapped operands.
1402 Lo = DAG.getNode(ISD::BSWAP, Lo.getValueType(), Lo);
1403 Hi = DAG.getNode(ISD::BSWAP, Hi.getValueType(), Hi);
1406 void DAGTypeLegalizer::ExpandIntRes_Constant(SDNode *N,
1407 SDValue &Lo, SDValue &Hi) {
1408 MVT NVT = TLI.getTypeToTransformTo(N->getValueType(0));
1409 unsigned NBitWidth = NVT.getSizeInBits();
1410 const APInt &Cst = cast<ConstantSDNode>(N)->getAPIntValue();
1411 Lo = DAG.getConstant(APInt(Cst).trunc(NBitWidth), NVT);
1412 Hi = DAG.getConstant(Cst.lshr(NBitWidth).trunc(NBitWidth), NVT);
1415 void DAGTypeLegalizer::ExpandIntRes_CTLZ(SDNode *N,
1416 SDValue &Lo, SDValue &Hi) {
1417 // ctlz (HiLo) -> Hi != 0 ? ctlz(Hi) : (ctlz(Lo)+32)
1418 GetExpandedInteger(N->getOperand(0), Lo, Hi);
1419 MVT NVT = Lo.getValueType();
1421 SDValue HiNotZero = DAG.getSetCC(TLI.getSetCCResultType(Hi), Hi,
1422 DAG.getConstant(0, NVT), ISD::SETNE);
1424 SDValue LoLZ = DAG.getNode(ISD::CTLZ, NVT, Lo);
1425 SDValue HiLZ = DAG.getNode(ISD::CTLZ, NVT, Hi);
1427 Lo = DAG.getNode(ISD::SELECT, NVT, HiNotZero, HiLZ,
1428 DAG.getNode(ISD::ADD, NVT, LoLZ,
1429 DAG.getConstant(NVT.getSizeInBits(), NVT)));
1430 Hi = DAG.getConstant(0, NVT);
1433 void DAGTypeLegalizer::ExpandIntRes_CTPOP(SDNode *N,
1434 SDValue &Lo, SDValue &Hi) {
1435 // ctpop(HiLo) -> ctpop(Hi)+ctpop(Lo)
1436 GetExpandedInteger(N->getOperand(0), Lo, Hi);
1437 MVT NVT = Lo.getValueType();
1438 Lo = DAG.getNode(ISD::ADD, NVT, DAG.getNode(ISD::CTPOP, NVT, Lo),
1439 DAG.getNode(ISD::CTPOP, NVT, Hi));
1440 Hi = DAG.getConstant(0, NVT);
1443 void DAGTypeLegalizer::ExpandIntRes_CTTZ(SDNode *N,
1444 SDValue &Lo, SDValue &Hi) {
1445 // cttz (HiLo) -> Lo != 0 ? cttz(Lo) : (cttz(Hi)+32)
1446 GetExpandedInteger(N->getOperand(0), Lo, Hi);
1447 MVT NVT = Lo.getValueType();
1449 SDValue LoNotZero = DAG.getSetCC(TLI.getSetCCResultType(Lo), Lo,
1450 DAG.getConstant(0, NVT), ISD::SETNE);
1452 SDValue LoLZ = DAG.getNode(ISD::CTTZ, NVT, Lo);
1453 SDValue HiLZ = DAG.getNode(ISD::CTTZ, NVT, Hi);
1455 Lo = DAG.getNode(ISD::SELECT, NVT, LoNotZero, LoLZ,
1456 DAG.getNode(ISD::ADD, NVT, HiLZ,
1457 DAG.getConstant(NVT.getSizeInBits(), NVT)));
1458 Hi = DAG.getConstant(0, NVT);
1461 void DAGTypeLegalizer::ExpandIntRes_FP_TO_SINT(SDNode *N, SDValue &Lo,
1463 MVT VT = N->getValueType(0);
1464 SDValue Op = N->getOperand(0);
1465 RTLIB::Libcall LC = RTLIB::getFPTOSINT(Op.getValueType(), VT);
1466 assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unexpected fp-to-sint conversion!");
1467 SplitInteger(MakeLibCall(LC, VT, &Op, 1, true/*sign irrelevant*/), Lo, Hi);
1470 void DAGTypeLegalizer::ExpandIntRes_FP_TO_UINT(SDNode *N, SDValue &Lo,
1472 MVT VT = N->getValueType(0);
1473 SDValue Op = N->getOperand(0);
1474 RTLIB::Libcall LC = RTLIB::getFPTOUINT(Op.getValueType(), VT);
1475 assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unexpected fp-to-uint conversion!");
1476 SplitInteger(MakeLibCall(LC, VT, &Op, 1, false/*sign irrelevant*/), Lo, Hi);
1479 void DAGTypeLegalizer::ExpandIntRes_LOAD(LoadSDNode *N,
1480 SDValue &Lo, SDValue &Hi) {
1481 if (ISD::isNormalLoad(N)) {
1482 ExpandRes_NormalLoad(N, Lo, Hi);
1486 assert(ISD::isUNINDEXEDLoad(N) && "Indexed load during type legalization!");
1488 MVT VT = N->getValueType(0);
1489 MVT NVT = TLI.getTypeToTransformTo(VT);
1490 SDValue Ch = N->getChain();
1491 SDValue Ptr = N->getBasePtr();
1492 ISD::LoadExtType ExtType = N->getExtensionType();
1493 int SVOffset = N->getSrcValueOffset();
1494 unsigned Alignment = N->getAlignment();
1495 bool isVolatile = N->isVolatile();
1497 assert(NVT.isByteSized() && "Expanded type not byte sized!");
1499 if (N->getMemoryVT().bitsLE(NVT)) {
1500 MVT EVT = N->getMemoryVT();
1502 Lo = DAG.getExtLoad(ExtType, NVT, Ch, Ptr, N->getSrcValue(), SVOffset, EVT,
1503 isVolatile, Alignment);
1505 // Remember the chain.
1506 Ch = Lo.getValue(1);
1508 if (ExtType == ISD::SEXTLOAD) {
1509 // The high part is obtained by SRA'ing all but one of the bits of the
1511 unsigned LoSize = Lo.getValueType().getSizeInBits();
1512 Hi = DAG.getNode(ISD::SRA, NVT, Lo,
1513 DAG.getConstant(LoSize-1, TLI.getShiftAmountTy()));
1514 } else if (ExtType == ISD::ZEXTLOAD) {
1515 // The high part is just a zero.
1516 Hi = DAG.getConstant(0, NVT);
1518 assert(ExtType == ISD::EXTLOAD && "Unknown extload!");
1519 // The high part is undefined.
1520 Hi = DAG.getNode(ISD::UNDEF, NVT);
1522 } else if (TLI.isLittleEndian()) {
1523 // Little-endian - low bits are at low addresses.
1524 Lo = DAG.getLoad(NVT, Ch, Ptr, N->getSrcValue(), SVOffset,
1525 isVolatile, Alignment);
1527 unsigned ExcessBits =
1528 N->getMemoryVT().getSizeInBits() - NVT.getSizeInBits();
1529 MVT NEVT = MVT::getIntegerVT(ExcessBits);
1531 // Increment the pointer to the other half.
1532 unsigned IncrementSize = NVT.getSizeInBits()/8;
1533 Ptr = DAG.getNode(ISD::ADD, Ptr.getValueType(), Ptr,
1534 DAG.getIntPtrConstant(IncrementSize));
1535 Hi = DAG.getExtLoad(ExtType, NVT, Ch, Ptr, N->getSrcValue(),
1536 SVOffset+IncrementSize, NEVT,
1537 isVolatile, MinAlign(Alignment, IncrementSize));
1539 // Build a factor node to remember that this load is independent of the
1541 Ch = DAG.getNode(ISD::TokenFactor, MVT::Other, Lo.getValue(1),
1544 // Big-endian - high bits are at low addresses. Favor aligned loads at
1545 // the cost of some bit-fiddling.
1546 MVT EVT = N->getMemoryVT();
1547 unsigned EBytes = EVT.getStoreSizeInBits()/8;
1548 unsigned IncrementSize = NVT.getSizeInBits()/8;
1549 unsigned ExcessBits = (EBytes - IncrementSize)*8;
1551 // Load both the high bits and maybe some of the low bits.
1552 Hi = DAG.getExtLoad(ExtType, NVT, Ch, Ptr, N->getSrcValue(), SVOffset,
1553 MVT::getIntegerVT(EVT.getSizeInBits() - ExcessBits),
1554 isVolatile, Alignment);
1556 // Increment the pointer to the other half.
1557 Ptr = DAG.getNode(ISD::ADD, Ptr.getValueType(), Ptr,
1558 DAG.getIntPtrConstant(IncrementSize));
1559 // Load the rest of the low bits.
1560 Lo = DAG.getExtLoad(ISD::ZEXTLOAD, NVT, Ch, Ptr, N->getSrcValue(),
1561 SVOffset+IncrementSize,
1562 MVT::getIntegerVT(ExcessBits),
1563 isVolatile, MinAlign(Alignment, IncrementSize));
1565 // Build a factor node to remember that this load is independent of the
1567 Ch = DAG.getNode(ISD::TokenFactor, MVT::Other, Lo.getValue(1),
1570 if (ExcessBits < NVT.getSizeInBits()) {
1571 // Transfer low bits from the bottom of Hi to the top of Lo.
1572 Lo = DAG.getNode(ISD::OR, NVT, Lo,
1573 DAG.getNode(ISD::SHL, NVT, Hi,
1574 DAG.getConstant(ExcessBits,
1575 TLI.getShiftAmountTy())));
1576 // Move high bits to the right position in Hi.
1577 Hi = DAG.getNode(ExtType == ISD::SEXTLOAD ? ISD::SRA : ISD::SRL, NVT, Hi,
1578 DAG.getConstant(NVT.getSizeInBits() - ExcessBits,
1579 TLI.getShiftAmountTy()));
1583 // Legalized the chain result - switch anything that used the old chain to
1585 ReplaceValueWith(SDValue(N, 1), Ch);
1588 void DAGTypeLegalizer::ExpandIntRes_Logical(SDNode *N,
1589 SDValue &Lo, SDValue &Hi) {
1590 SDValue LL, LH, RL, RH;
1591 GetExpandedInteger(N->getOperand(0), LL, LH);
1592 GetExpandedInteger(N->getOperand(1), RL, RH);
1593 Lo = DAG.getNode(N->getOpcode(), LL.getValueType(), LL, RL);
1594 Hi = DAG.getNode(N->getOpcode(), LL.getValueType(), LH, RH);
1597 void DAGTypeLegalizer::ExpandIntRes_MUL(SDNode *N,
1598 SDValue &Lo, SDValue &Hi) {
1599 MVT VT = N->getValueType(0);
1600 MVT NVT = TLI.getTypeToTransformTo(VT);
1602 bool HasMULHS = TLI.isOperationLegal(ISD::MULHS, NVT);
1603 bool HasMULHU = TLI.isOperationLegal(ISD::MULHU, NVT);
1604 bool HasSMUL_LOHI = TLI.isOperationLegal(ISD::SMUL_LOHI, NVT);
1605 bool HasUMUL_LOHI = TLI.isOperationLegal(ISD::UMUL_LOHI, NVT);
1606 if (HasMULHU || HasMULHS || HasUMUL_LOHI || HasSMUL_LOHI) {
1607 SDValue LL, LH, RL, RH;
1608 GetExpandedInteger(N->getOperand(0), LL, LH);
1609 GetExpandedInteger(N->getOperand(1), RL, RH);
1610 unsigned OuterBitSize = VT.getSizeInBits();
1611 unsigned InnerBitSize = NVT.getSizeInBits();
1612 unsigned LHSSB = DAG.ComputeNumSignBits(N->getOperand(0));
1613 unsigned RHSSB = DAG.ComputeNumSignBits(N->getOperand(1));
1615 APInt HighMask = APInt::getHighBitsSet(OuterBitSize, InnerBitSize);
1616 if (DAG.MaskedValueIsZero(N->getOperand(0), HighMask) &&
1617 DAG.MaskedValueIsZero(N->getOperand(1), HighMask)) {
1618 // The inputs are both zero-extended.
1620 // We can emit a umul_lohi.
1621 Lo = DAG.getNode(ISD::UMUL_LOHI, DAG.getVTList(NVT, NVT), LL, RL);
1622 Hi = SDValue(Lo.getNode(), 1);
1626 // We can emit a mulhu+mul.
1627 Lo = DAG.getNode(ISD::MUL, NVT, LL, RL);
1628 Hi = DAG.getNode(ISD::MULHU, NVT, LL, RL);
1632 if (LHSSB > InnerBitSize && RHSSB > InnerBitSize) {
1633 // The input values are both sign-extended.
1635 // We can emit a smul_lohi.
1636 Lo = DAG.getNode(ISD::SMUL_LOHI, DAG.getVTList(NVT, NVT), LL, RL);
1637 Hi = SDValue(Lo.getNode(), 1);
1641 // We can emit a mulhs+mul.
1642 Lo = DAG.getNode(ISD::MUL, NVT, LL, RL);
1643 Hi = DAG.getNode(ISD::MULHS, NVT, LL, RL);
1648 // Lo,Hi = umul LHS, RHS.
1649 SDValue UMulLOHI = DAG.getNode(ISD::UMUL_LOHI,
1650 DAG.getVTList(NVT, NVT), LL, RL);
1652 Hi = UMulLOHI.getValue(1);
1653 RH = DAG.getNode(ISD::MUL, NVT, LL, RH);
1654 LH = DAG.getNode(ISD::MUL, NVT, LH, RL);
1655 Hi = DAG.getNode(ISD::ADD, NVT, Hi, RH);
1656 Hi = DAG.getNode(ISD::ADD, NVT, Hi, LH);
1660 Lo = DAG.getNode(ISD::MUL, NVT, LL, RL);
1661 Hi = DAG.getNode(ISD::MULHU, NVT, LL, RL);
1662 RH = DAG.getNode(ISD::MUL, NVT, LL, RH);
1663 LH = DAG.getNode(ISD::MUL, NVT, LH, RL);
1664 Hi = DAG.getNode(ISD::ADD, NVT, Hi, RH);
1665 Hi = DAG.getNode(ISD::ADD, NVT, Hi, LH);
1670 // If nothing else, we can make a libcall.
1671 RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
1673 LC = RTLIB::MUL_I32;
1674 else if (VT == MVT::i64)
1675 LC = RTLIB::MUL_I64;
1676 else if (VT == MVT::i128)
1677 LC = RTLIB::MUL_I128;
1678 assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unsupported MUL!");
1680 SDValue Ops[2] = { N->getOperand(0), N->getOperand(1) };
1681 SplitInteger(MakeLibCall(LC, VT, Ops, 2, true/*sign irrelevant*/), Lo, Hi);
1684 void DAGTypeLegalizer::ExpandIntRes_SDIV(SDNode *N,
1685 SDValue &Lo, SDValue &Hi) {
1686 MVT VT = N->getValueType(0);
1688 RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
1690 LC = RTLIB::SDIV_I32;
1691 else if (VT == MVT::i64)
1692 LC = RTLIB::SDIV_I64;
1693 else if (VT == MVT::i128)
1694 LC = RTLIB::SDIV_I128;
1695 assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unsupported SDIV!");
1697 SDValue Ops[2] = { N->getOperand(0), N->getOperand(1) };
1698 SplitInteger(MakeLibCall(LC, VT, Ops, 2, true), Lo, Hi);
1701 void DAGTypeLegalizer::ExpandIntRes_Shift(SDNode *N,
1702 SDValue &Lo, SDValue &Hi) {
1703 MVT VT = N->getValueType(0);
1705 // If we can emit an efficient shift operation, do so now. Check to see if
1706 // the RHS is a constant.
1707 if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N->getOperand(1)))
1708 return ExpandShiftByConstant(N, CN->getZExtValue(), Lo, Hi);
1710 // If we can determine that the high bit of the shift is zero or one, even if
1711 // the low bits are variable, emit this shift in an optimized form.
1712 if (ExpandShiftWithKnownAmountBit(N, Lo, Hi))
1715 // If this target supports shift_PARTS, use it. First, map to the _PARTS opc.
1717 if (N->getOpcode() == ISD::SHL) {
1718 PartsOpc = ISD::SHL_PARTS;
1719 } else if (N->getOpcode() == ISD::SRL) {
1720 PartsOpc = ISD::SRL_PARTS;
1722 assert(N->getOpcode() == ISD::SRA && "Unknown shift!");
1723 PartsOpc = ISD::SRA_PARTS;
1726 // Next check to see if the target supports this SHL_PARTS operation or if it
1727 // will custom expand it.
1728 MVT NVT = TLI.getTypeToTransformTo(VT);
1729 TargetLowering::LegalizeAction Action = TLI.getOperationAction(PartsOpc, NVT);
1730 if ((Action == TargetLowering::Legal && TLI.isTypeLegal(NVT)) ||
1731 Action == TargetLowering::Custom) {
1732 // Expand the subcomponents.
1734 GetExpandedInteger(N->getOperand(0), LHSL, LHSH);
1736 SDValue Ops[] = { LHSL, LHSH, N->getOperand(1) };
1737 MVT VT = LHSL.getValueType();
1738 Lo = DAG.getNode(PartsOpc, DAG.getNodeValueTypes(VT, VT), 2, Ops, 3);
1739 Hi = Lo.getValue(1);
1743 // Otherwise, emit a libcall.
1744 RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
1746 if (N->getOpcode() == ISD::SHL) {
1747 isSigned = false; /*sign irrelevant*/
1749 LC = RTLIB::SHL_I32;
1750 else if (VT == MVT::i64)
1751 LC = RTLIB::SHL_I64;
1752 else if (VT == MVT::i128)
1753 LC = RTLIB::SHL_I128;
1754 } else if (N->getOpcode() == ISD::SRL) {
1757 LC = RTLIB::SRL_I32;
1758 else if (VT == MVT::i64)
1759 LC = RTLIB::SRL_I64;
1760 else if (VT == MVT::i128)
1761 LC = RTLIB::SRL_I128;
1763 assert(N->getOpcode() == ISD::SRA && "Unknown shift!");
1766 LC = RTLIB::SRA_I32;
1767 else if (VT == MVT::i64)
1768 LC = RTLIB::SRA_I64;
1769 else if (VT == MVT::i128)
1770 LC = RTLIB::SRA_I128;
1772 assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unsupported shift!");
1774 SDValue Ops[2] = { N->getOperand(0), N->getOperand(1) };
1775 SplitInteger(MakeLibCall(LC, VT, Ops, 2, isSigned), Lo, Hi);
1778 void DAGTypeLegalizer::ExpandIntRes_SIGN_EXTEND(SDNode *N,
1779 SDValue &Lo, SDValue &Hi) {
1780 MVT NVT = TLI.getTypeToTransformTo(N->getValueType(0));
1781 SDValue Op = N->getOperand(0);
1782 if (Op.getValueType().bitsLE(NVT)) {
1783 // The low part is sign extension of the input (degenerates to a copy).
1784 Lo = DAG.getNode(ISD::SIGN_EXTEND, NVT, N->getOperand(0));
1785 // The high part is obtained by SRA'ing all but one of the bits of low part.
1786 unsigned LoSize = NVT.getSizeInBits();
1787 Hi = DAG.getNode(ISD::SRA, NVT, Lo,
1788 DAG.getConstant(LoSize-1, TLI.getShiftAmountTy()));
1790 // For example, extension of an i48 to an i64. The operand type necessarily
1791 // promotes to the result type, so will end up being expanded too.
1792 assert(getTypeAction(Op.getValueType()) == PromoteInteger &&
1793 "Only know how to promote this result!");
1794 SDValue Res = GetPromotedInteger(Op);
1795 assert(Res.getValueType() == N->getValueType(0) &&
1796 "Operand over promoted?");
1797 // Split the promoted operand. This will simplify when it is expanded.
1798 SplitInteger(Res, Lo, Hi);
1799 unsigned ExcessBits =
1800 Op.getValueType().getSizeInBits() - NVT.getSizeInBits();
1801 Hi = DAG.getNode(ISD::SIGN_EXTEND_INREG, Hi.getValueType(), Hi,
1802 DAG.getValueType(MVT::getIntegerVT(ExcessBits)));
1806 void DAGTypeLegalizer::
1807 ExpandIntRes_SIGN_EXTEND_INREG(SDNode *N, SDValue &Lo, SDValue &Hi) {
1808 GetExpandedInteger(N->getOperand(0), Lo, Hi);
1809 MVT EVT = cast<VTSDNode>(N->getOperand(1))->getVT();
1811 if (EVT.bitsLE(Lo.getValueType())) {
1812 // sext_inreg the low part if needed.
1813 Lo = DAG.getNode(ISD::SIGN_EXTEND_INREG, Lo.getValueType(), Lo,
1816 // The high part gets the sign extension from the lo-part. This handles
1817 // things like sextinreg V:i64 from i8.
1818 Hi = DAG.getNode(ISD::SRA, Hi.getValueType(), Lo,
1819 DAG.getConstant(Hi.getValueType().getSizeInBits()-1,
1820 TLI.getShiftAmountTy()));
1822 // For example, extension of an i48 to an i64. Leave the low part alone,
1823 // sext_inreg the high part.
1824 unsigned ExcessBits =
1825 EVT.getSizeInBits() - Lo.getValueType().getSizeInBits();
1826 Hi = DAG.getNode(ISD::SIGN_EXTEND_INREG, Hi.getValueType(), Hi,
1827 DAG.getValueType(MVT::getIntegerVT(ExcessBits)));
1831 void DAGTypeLegalizer::ExpandIntRes_SREM(SDNode *N,
1832 SDValue &Lo, SDValue &Hi) {
1833 MVT VT = N->getValueType(0);
1835 RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
1837 LC = RTLIB::SREM_I32;
1838 else if (VT == MVT::i64)
1839 LC = RTLIB::SREM_I64;
1840 else if (VT == MVT::i128)
1841 LC = RTLIB::SREM_I128;
1842 assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unsupported SREM!");
1844 SDValue Ops[2] = { N->getOperand(0), N->getOperand(1) };
1845 SplitInteger(MakeLibCall(LC, VT, Ops, 2, true), Lo, Hi);
1848 void DAGTypeLegalizer::ExpandIntRes_TRUNCATE(SDNode *N,
1849 SDValue &Lo, SDValue &Hi) {
1850 MVT NVT = TLI.getTypeToTransformTo(N->getValueType(0));
1851 Lo = DAG.getNode(ISD::TRUNCATE, NVT, N->getOperand(0));
1852 Hi = DAG.getNode(ISD::SRL, N->getOperand(0).getValueType(), N->getOperand(0),
1853 DAG.getConstant(NVT.getSizeInBits(),
1854 TLI.getShiftAmountTy()));
1855 Hi = DAG.getNode(ISD::TRUNCATE, NVT, Hi);
1858 void DAGTypeLegalizer::ExpandIntRes_UDIV(SDNode *N,
1859 SDValue &Lo, SDValue &Hi) {
1860 MVT VT = N->getValueType(0);
1862 RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
1864 LC = RTLIB::UDIV_I32;
1865 else if (VT == MVT::i64)
1866 LC = RTLIB::UDIV_I64;
1867 else if (VT == MVT::i128)
1868 LC = RTLIB::UDIV_I128;
1869 assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unsupported UDIV!");
1871 SDValue Ops[2] = { N->getOperand(0), N->getOperand(1) };
1872 SplitInteger(MakeLibCall(LC, VT, Ops, 2, false), Lo, Hi);
1875 void DAGTypeLegalizer::ExpandIntRes_UREM(SDNode *N,
1876 SDValue &Lo, SDValue &Hi) {
1877 MVT VT = N->getValueType(0);
1879 RTLIB::Libcall LC = RTLIB::UNKNOWN_LIBCALL;
1881 LC = RTLIB::UREM_I32;
1882 else if (VT == MVT::i64)
1883 LC = RTLIB::UREM_I64;
1884 else if (VT == MVT::i128)
1885 LC = RTLIB::UREM_I128;
1886 assert(LC != RTLIB::UNKNOWN_LIBCALL && "Unsupported UREM!");
1888 SDValue Ops[2] = { N->getOperand(0), N->getOperand(1) };
1889 SplitInteger(MakeLibCall(LC, VT, Ops, 2, false), Lo, Hi);
1892 void DAGTypeLegalizer::ExpandIntRes_ZERO_EXTEND(SDNode *N,
1893 SDValue &Lo, SDValue &Hi) {
1894 MVT NVT = TLI.getTypeToTransformTo(N->getValueType(0));
1895 SDValue Op = N->getOperand(0);
1896 if (Op.getValueType().bitsLE(NVT)) {
1897 // The low part is zero extension of the input (degenerates to a copy).
1898 Lo = DAG.getNode(ISD::ZERO_EXTEND, NVT, N->getOperand(0));
1899 Hi = DAG.getConstant(0, NVT); // The high part is just a zero.
1901 // For example, extension of an i48 to an i64. The operand type necessarily
1902 // promotes to the result type, so will end up being expanded too.
1903 assert(getTypeAction(Op.getValueType()) == PromoteInteger &&
1904 "Only know how to promote this result!");
1905 SDValue Res = GetPromotedInteger(Op);
1906 assert(Res.getValueType() == N->getValueType(0) &&
1907 "Operand over promoted?");
1908 // Split the promoted operand. This will simplify when it is expanded.
1909 SplitInteger(Res, Lo, Hi);
1910 unsigned ExcessBits =
1911 Op.getValueType().getSizeInBits() - NVT.getSizeInBits();
1912 Hi = DAG.getZeroExtendInReg(Hi, MVT::getIntegerVT(ExcessBits));
1917 //===----------------------------------------------------------------------===//
1918 // Integer Operand Expansion
1919 //===----------------------------------------------------------------------===//
1921 /// ExpandIntegerOperand - This method is called when the specified operand of
1922 /// the specified node is found to need expansion. At this point, all of the
1923 /// result types of the node are known to be legal, but other operands of the
1924 /// node may need promotion or expansion as well as the specified one.
1925 bool DAGTypeLegalizer::ExpandIntegerOperand(SDNode *N, unsigned OpNo) {
1926 DEBUG(cerr << "Expand integer operand: "; N->dump(&DAG); cerr << "\n");
1927 SDValue Res = SDValue();
1929 if (TLI.getOperationAction(N->getOpcode(), N->getOperand(OpNo).getValueType())
1930 == TargetLowering::Custom)
1931 Res = TLI.LowerOperation(SDValue(N, 0), DAG);
1933 if (Res.getNode() == 0) {
1934 switch (N->getOpcode()) {
1937 cerr << "ExpandIntegerOperand Op #" << OpNo << ": ";
1938 N->dump(&DAG); cerr << "\n";
1940 assert(0 && "Do not know how to expand this operator's operand!");
1943 case ISD::BUILD_VECTOR: Res = ExpandOp_BUILD_VECTOR(N); break;
1944 case ISD::BIT_CONVERT: Res = ExpandOp_BIT_CONVERT(N); break;
1945 case ISD::EXTRACT_ELEMENT: Res = ExpandOp_EXTRACT_ELEMENT(N); break;
1946 case ISD::INSERT_VECTOR_ELT: Res = ExpandOp_INSERT_VECTOR_ELT(N); break;
1947 case ISD::SCALAR_TO_VECTOR: Res = ExpandOp_SCALAR_TO_VECTOR(N); break;
1949 case ISD::BR_CC: Res = ExpandIntOp_BR_CC(N); break;
1950 case ISD::SELECT_CC: Res = ExpandIntOp_SELECT_CC(N); break;
1951 case ISD::SETCC: Res = ExpandIntOp_SETCC(N); break;
1952 case ISD::SINT_TO_FP: Res = ExpandIntOp_SINT_TO_FP(N); break;
1953 case ISD::STORE: Res = ExpandIntOp_STORE(cast<StoreSDNode>(N), OpNo);
1955 case ISD::TRUNCATE: Res = ExpandIntOp_TRUNCATE(N); break;
1956 case ISD::UINT_TO_FP: Res = ExpandIntOp_UINT_TO_FP(N); break;
1960 // If the result is null, the sub-method took care of registering results etc.
1961 if (!Res.getNode()) return false;
1963 // If the result is N, the sub-method updated N in place. Tell the legalizer
1965 if (Res.getNode() == N)
1968 assert(Res.getValueType() == N->getValueType(0) && N->getNumValues() == 1 &&
1969 "Invalid operand expansion");
1971 ReplaceValueWith(SDValue(N, 0), Res);
1975 /// IntegerExpandSetCCOperands - Expand the operands of a comparison. This code
1976 /// is shared among BR_CC, SELECT_CC, and SETCC handlers.
1977 void DAGTypeLegalizer::IntegerExpandSetCCOperands(SDValue &NewLHS,
1979 ISD::CondCode &CCCode) {
1980 SDValue LHSLo, LHSHi, RHSLo, RHSHi;
1981 GetExpandedInteger(NewLHS, LHSLo, LHSHi);
1982 GetExpandedInteger(NewRHS, RHSLo, RHSHi);
1984 MVT VT = NewLHS.getValueType();
1986 if (CCCode == ISD::SETEQ || CCCode == ISD::SETNE) {
1987 if (RHSLo == RHSHi) {
1988 if (ConstantSDNode *RHSCST = dyn_cast<ConstantSDNode>(RHSLo)) {
1989 if (RHSCST->isAllOnesValue()) {
1990 // Equality comparison to -1.
1991 NewLHS = DAG.getNode(ISD::AND, LHSLo.getValueType(), LHSLo, LHSHi);
1998 NewLHS = DAG.getNode(ISD::XOR, LHSLo.getValueType(), LHSLo, RHSLo);
1999 NewRHS = DAG.getNode(ISD::XOR, LHSLo.getValueType(), LHSHi, RHSHi);
2000 NewLHS = DAG.getNode(ISD::OR, NewLHS.getValueType(), NewLHS, NewRHS);
2001 NewRHS = DAG.getConstant(0, NewLHS.getValueType());
2005 // If this is a comparison of the sign bit, just look at the top part.
2007 if (ConstantSDNode *CST = dyn_cast<ConstantSDNode>(NewRHS))
2008 if ((CCCode == ISD::SETLT && CST->isNullValue()) || // X < 0
2009 (CCCode == ISD::SETGT && CST->isAllOnesValue())) { // X > -1
2015 // FIXME: This generated code sucks.
2016 ISD::CondCode LowCC;
2018 default: assert(0 && "Unknown integer setcc!");
2020 case ISD::SETULT: LowCC = ISD::SETULT; break;
2022 case ISD::SETUGT: LowCC = ISD::SETUGT; break;
2024 case ISD::SETULE: LowCC = ISD::SETULE; break;
2026 case ISD::SETUGE: LowCC = ISD::SETUGE; break;
2029 // Tmp1 = lo(op1) < lo(op2) // Always unsigned comparison
2030 // Tmp2 = hi(op1) < hi(op2) // Signedness depends on operands
2031 // dest = hi(op1) == hi(op2) ? Tmp1 : Tmp2;
2033 // NOTE: on targets without efficient SELECT of bools, we can always use
2034 // this identity: (B1 ? B2 : B3) --> (B1 & B2)|(!B1&B3)
2035 TargetLowering::DAGCombinerInfo DagCombineInfo(DAG, false, true, NULL);
2037 Tmp1 = TLI.SimplifySetCC(TLI.getSetCCResultType(LHSLo), LHSLo, RHSLo, LowCC,
2038 false, DagCombineInfo);
2039 if (!Tmp1.getNode())
2040 Tmp1 = DAG.getSetCC(TLI.getSetCCResultType(LHSLo), LHSLo, RHSLo, LowCC);
2041 Tmp2 = TLI.SimplifySetCC(TLI.getSetCCResultType(LHSHi), LHSHi, RHSHi,
2042 CCCode, false, DagCombineInfo);
2043 if (!Tmp2.getNode())
2044 Tmp2 = DAG.getNode(ISD::SETCC, TLI.getSetCCResultType(LHSHi), LHSHi, RHSHi,
2045 DAG.getCondCode(CCCode));
2047 ConstantSDNode *Tmp1C = dyn_cast<ConstantSDNode>(Tmp1.getNode());
2048 ConstantSDNode *Tmp2C = dyn_cast<ConstantSDNode>(Tmp2.getNode());
2049 if ((Tmp1C && Tmp1C->isNullValue()) ||
2050 (Tmp2C && Tmp2C->isNullValue() &&
2051 (CCCode == ISD::SETLE || CCCode == ISD::SETGE ||
2052 CCCode == ISD::SETUGE || CCCode == ISD::SETULE)) ||
2053 (Tmp2C && Tmp2C->getAPIntValue() == 1 &&
2054 (CCCode == ISD::SETLT || CCCode == ISD::SETGT ||
2055 CCCode == ISD::SETUGT || CCCode == ISD::SETULT))) {
2056 // low part is known false, returns high part.
2057 // For LE / GE, if high part is known false, ignore the low part.
2058 // For LT / GT, if high part is known true, ignore the low part.
2064 NewLHS = TLI.SimplifySetCC(TLI.getSetCCResultType(LHSHi), LHSHi, RHSHi,
2065 ISD::SETEQ, false, DagCombineInfo);
2066 if (!NewLHS.getNode())
2067 NewLHS = DAG.getSetCC(TLI.getSetCCResultType(LHSHi), LHSHi, RHSHi,
2069 NewLHS = DAG.getNode(ISD::SELECT, Tmp1.getValueType(),
2070 NewLHS, Tmp1, Tmp2);
2074 SDValue DAGTypeLegalizer::ExpandIntOp_BR_CC(SDNode *N) {
2075 SDValue NewLHS = N->getOperand(2), NewRHS = N->getOperand(3);
2076 ISD::CondCode CCCode = cast<CondCodeSDNode>(N->getOperand(1))->get();
2077 IntegerExpandSetCCOperands(NewLHS, NewRHS, CCCode);
2079 // If ExpandSetCCOperands returned a scalar, we need to compare the result
2080 // against zero to select between true and false values.
2081 if (NewRHS.getNode() == 0) {
2082 NewRHS = DAG.getConstant(0, NewLHS.getValueType());
2083 CCCode = ISD::SETNE;
2086 // Update N to have the operands specified.
2087 return DAG.UpdateNodeOperands(SDValue(N, 0), N->getOperand(0),
2088 DAG.getCondCode(CCCode), NewLHS, NewRHS,
2092 SDValue DAGTypeLegalizer::ExpandIntOp_SELECT_CC(SDNode *N) {
2093 SDValue NewLHS = N->getOperand(0), NewRHS = N->getOperand(1);
2094 ISD::CondCode CCCode = cast<CondCodeSDNode>(N->getOperand(4))->get();
2095 IntegerExpandSetCCOperands(NewLHS, NewRHS, CCCode);
2097 // If ExpandSetCCOperands returned a scalar, we need to compare the result
2098 // against zero to select between true and false values.
2099 if (NewRHS.getNode() == 0) {
2100 NewRHS = DAG.getConstant(0, NewLHS.getValueType());
2101 CCCode = ISD::SETNE;
2104 // Update N to have the operands specified.
2105 return DAG.UpdateNodeOperands(SDValue(N, 0), NewLHS, NewRHS,
2106 N->getOperand(2), N->getOperand(3),
2107 DAG.getCondCode(CCCode));
2110 SDValue DAGTypeLegalizer::ExpandIntOp_SETCC(SDNode *N) {
2111 SDValue NewLHS = N->getOperand(0), NewRHS = N->getOperand(1);
2112 ISD::CondCode CCCode = cast<CondCodeSDNode>(N->getOperand(2))->get();
2113 IntegerExpandSetCCOperands(NewLHS, NewRHS, CCCode);
2115 // If ExpandSetCCOperands returned a scalar, use it.
2116 if (NewRHS.getNode() == 0) {
2117 assert(NewLHS.getValueType() == N->getValueType(0) &&
2118 "Unexpected setcc expansion!");
2122 // Otherwise, update N to have the operands specified.
2123 return DAG.UpdateNodeOperands(SDValue(N, 0), NewLHS, NewRHS,
2124 DAG.getCondCode(CCCode));
2127 SDValue DAGTypeLegalizer::ExpandIntOp_SINT_TO_FP(SDNode *N) {
2128 SDValue Op = N->getOperand(0);
2129 MVT DstVT = N->getValueType(0);
2130 RTLIB::Libcall LC = RTLIB::getSINTTOFP(Op.getValueType(), DstVT);
2131 assert(LC != RTLIB::UNKNOWN_LIBCALL &&
2132 "Don't know how to expand this SINT_TO_FP!");
2133 return MakeLibCall(LC, DstVT, &Op, 1, true);
2136 SDValue DAGTypeLegalizer::ExpandIntOp_STORE(StoreSDNode *N, unsigned OpNo) {
2137 if (ISD::isNormalStore(N))
2138 return ExpandOp_NormalStore(N, OpNo);
2140 assert(ISD::isUNINDEXEDStore(N) && "Indexed store during type legalization!");
2141 assert(OpNo == 1 && "Can only expand the stored value so far");
2143 MVT VT = N->getOperand(1).getValueType();
2144 MVT NVT = TLI.getTypeToTransformTo(VT);
2145 SDValue Ch = N->getChain();
2146 SDValue Ptr = N->getBasePtr();
2147 int SVOffset = N->getSrcValueOffset();
2148 unsigned Alignment = N->getAlignment();
2149 bool isVolatile = N->isVolatile();
2152 assert(NVT.isByteSized() && "Expanded type not byte sized!");
2154 if (N->getMemoryVT().bitsLE(NVT)) {
2155 GetExpandedInteger(N->getValue(), Lo, Hi);
2156 return DAG.getTruncStore(Ch, Lo, Ptr, N->getSrcValue(), SVOffset,
2157 N->getMemoryVT(), isVolatile, Alignment);
2158 } else if (TLI.isLittleEndian()) {
2159 // Little-endian - low bits are at low addresses.
2160 GetExpandedInteger(N->getValue(), Lo, Hi);
2162 Lo = DAG.getStore(Ch, Lo, Ptr, N->getSrcValue(), SVOffset,
2163 isVolatile, Alignment);
2165 unsigned ExcessBits =
2166 N->getMemoryVT().getSizeInBits() - NVT.getSizeInBits();
2167 MVT NEVT = MVT::getIntegerVT(ExcessBits);
2169 // Increment the pointer to the other half.
2170 unsigned IncrementSize = NVT.getSizeInBits()/8;
2171 Ptr = DAG.getNode(ISD::ADD, Ptr.getValueType(), Ptr,
2172 DAG.getIntPtrConstant(IncrementSize));
2173 Hi = DAG.getTruncStore(Ch, Hi, Ptr, N->getSrcValue(),
2174 SVOffset+IncrementSize, NEVT,
2175 isVolatile, MinAlign(Alignment, IncrementSize));
2176 return DAG.getNode(ISD::TokenFactor, MVT::Other, Lo, Hi);
2178 // Big-endian - high bits are at low addresses. Favor aligned stores at
2179 // the cost of some bit-fiddling.
2180 GetExpandedInteger(N->getValue(), Lo, Hi);
2182 MVT EVT = N->getMemoryVT();
2183 unsigned EBytes = EVT.getStoreSizeInBits()/8;
2184 unsigned IncrementSize = NVT.getSizeInBits()/8;
2185 unsigned ExcessBits = (EBytes - IncrementSize)*8;
2186 MVT HiVT = MVT::getIntegerVT(EVT.getSizeInBits() - ExcessBits);
2188 if (ExcessBits < NVT.getSizeInBits()) {
2189 // Transfer high bits from the top of Lo to the bottom of Hi.
2190 Hi = DAG.getNode(ISD::SHL, NVT, Hi,
2191 DAG.getConstant(NVT.getSizeInBits() - ExcessBits,
2192 TLI.getShiftAmountTy()));
2193 Hi = DAG.getNode(ISD::OR, NVT, Hi,
2194 DAG.getNode(ISD::SRL, NVT, Lo,
2195 DAG.getConstant(ExcessBits,
2196 TLI.getShiftAmountTy())));
2199 // Store both the high bits and maybe some of the low bits.
2200 Hi = DAG.getTruncStore(Ch, Hi, Ptr, N->getSrcValue(),
2201 SVOffset, HiVT, isVolatile, Alignment);
2203 // Increment the pointer to the other half.
2204 Ptr = DAG.getNode(ISD::ADD, Ptr.getValueType(), Ptr,
2205 DAG.getIntPtrConstant(IncrementSize));
2206 // Store the lowest ExcessBits bits in the second half.
2207 Lo = DAG.getTruncStore(Ch, Lo, Ptr, N->getSrcValue(),
2208 SVOffset+IncrementSize,
2209 MVT::getIntegerVT(ExcessBits),
2210 isVolatile, MinAlign(Alignment, IncrementSize));
2211 return DAG.getNode(ISD::TokenFactor, MVT::Other, Lo, Hi);
2215 SDValue DAGTypeLegalizer::ExpandIntOp_TRUNCATE(SDNode *N) {
2217 GetExpandedInteger(N->getOperand(0), InL, InH);
2218 // Just truncate the low part of the source.
2219 return DAG.getNode(ISD::TRUNCATE, N->getValueType(0), InL);
2222 SDValue DAGTypeLegalizer::ExpandIntOp_UINT_TO_FP(SDNode *N) {
2223 SDValue Op = N->getOperand(0);
2224 MVT SrcVT = Op.getValueType();
2225 MVT DstVT = N->getValueType(0);
2227 if (TLI.getOperationAction(ISD::SINT_TO_FP, SrcVT) == TargetLowering::Custom){
2228 // Do a signed conversion then adjust the result.
2229 SDValue SignedConv = DAG.getNode(ISD::SINT_TO_FP, DstVT, Op);
2230 SignedConv = TLI.LowerOperation(SignedConv, DAG);
2232 // The result of the signed conversion needs adjusting if the 'sign bit' of
2233 // the incoming integer was set. To handle this, we dynamically test to see
2234 // if it is set, and, if so, add a fudge factor.
2236 const uint64_t F32TwoE32 = 0x4F800000ULL;
2237 const uint64_t F32TwoE64 = 0x5F800000ULL;
2238 const uint64_t F32TwoE128 = 0x7F800000ULL;
2241 if (SrcVT == MVT::i32)
2242 FF = APInt(32, F32TwoE32);
2243 else if (SrcVT == MVT::i64)
2244 FF = APInt(32, F32TwoE64);
2245 else if (SrcVT == MVT::i128)
2246 FF = APInt(32, F32TwoE128);
2248 assert(false && "Unsupported UINT_TO_FP!");
2250 // Check whether the sign bit is set.
2252 GetExpandedInteger(Op, Lo, Hi);
2253 SDValue SignSet = DAG.getSetCC(TLI.getSetCCResultType(Hi), Hi,
2254 DAG.getConstant(0, Hi.getValueType()),
2257 // Build a 64 bit pair (0, FF) in the constant pool, with FF in the lo bits.
2258 SDValue FudgePtr = DAG.getConstantPool(ConstantInt::get(FF.zext(64)),
2259 TLI.getPointerTy());
2261 // Get a pointer to FF if the sign bit was set, or to 0 otherwise.
2262 SDValue Zero = DAG.getIntPtrConstant(0);
2263 SDValue Four = DAG.getIntPtrConstant(4);
2264 if (TLI.isBigEndian()) std::swap(Zero, Four);
2265 SDValue Offset = DAG.getNode(ISD::SELECT, Zero.getValueType(), SignSet,
2267 unsigned Alignment =
2268 1 << cast<ConstantPoolSDNode>(FudgePtr)->getAlignment();
2269 FudgePtr = DAG.getNode(ISD::ADD, TLI.getPointerTy(), FudgePtr, Offset);
2270 Alignment = std::min(Alignment, 4u);
2272 // Load the value out, extending it from f32 to the destination float type.
2273 // FIXME: Avoid the extend by constructing the right constant pool?
2274 SDValue Fudge = DAG.getExtLoad(ISD::EXTLOAD, DstVT, DAG.getEntryNode(),
2275 FudgePtr, NULL, 0, MVT::f32,
2277 return DAG.getNode(ISD::FADD, DstVT, SignedConv, Fudge);
2280 // Otherwise, use a libcall.
2281 RTLIB::Libcall LC = RTLIB::getUINTTOFP(SrcVT, DstVT);
2282 assert(LC != RTLIB::UNKNOWN_LIBCALL &&
2283 "Don't know how to expand this UINT_TO_FP!");
2284 return MakeLibCall(LC, DstVT, &Op, 1, true);