1 //===- InstCombineCalls.cpp -----------------------------------------------===//
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 the visitCall and visitInvoke functions.
12 //===----------------------------------------------------------------------===//
14 #include "InstCombine.h"
15 #include "llvm/IntrinsicInst.h"
16 #include "llvm/Support/CallSite.h"
17 #include "llvm/Target/TargetData.h"
18 #include "llvm/Analysis/MemoryBuiltins.h"
19 #include "llvm/Transforms/Utils/BuildLibCalls.h"
20 #include "llvm/Transforms/Utils/Local.h"
23 /// getPromotedType - Return the specified type promoted as it would be to pass
24 /// though a va_arg area.
25 static const Type *getPromotedType(const Type *Ty) {
26 if (const IntegerType* ITy = dyn_cast<IntegerType>(Ty)) {
27 if (ITy->getBitWidth() < 32)
28 return Type::getInt32Ty(Ty->getContext());
34 Instruction *InstCombiner::SimplifyMemTransfer(MemIntrinsic *MI) {
35 unsigned DstAlign = getKnownAlignment(MI->getArgOperand(0), TD);
36 unsigned SrcAlign = getKnownAlignment(MI->getArgOperand(1), TD);
37 unsigned MinAlign = std::min(DstAlign, SrcAlign);
38 unsigned CopyAlign = MI->getAlignment();
40 if (CopyAlign < MinAlign) {
41 MI->setAlignment(ConstantInt::get(MI->getAlignmentType(),
46 // If MemCpyInst length is 1/2/4/8 bytes then replace memcpy with
48 ConstantInt *MemOpLength = dyn_cast<ConstantInt>(MI->getArgOperand(2));
49 if (MemOpLength == 0) return 0;
51 // Source and destination pointer types are always "i8*" for intrinsic. See
52 // if the size is something we can handle with a single primitive load/store.
53 // A single load+store correctly handles overlapping memory in the memmove
55 unsigned Size = MemOpLength->getZExtValue();
56 if (Size == 0) return MI; // Delete this mem transfer.
58 if (Size > 8 || (Size&(Size-1)))
59 return 0; // If not 1/2/4/8 bytes, exit.
61 // Use an integer load+store unless we can find something better.
63 cast<PointerType>(MI->getArgOperand(1)->getType())->getAddressSpace();
65 cast<PointerType>(MI->getArgOperand(0)->getType())->getAddressSpace();
67 const IntegerType* IntType = IntegerType::get(MI->getContext(), Size<<3);
68 Type *NewSrcPtrTy = PointerType::get(IntType, SrcAddrSp);
69 Type *NewDstPtrTy = PointerType::get(IntType, DstAddrSp);
71 // Memcpy forces the use of i8* for the source and destination. That means
72 // that if you're using memcpy to move one double around, you'll get a cast
73 // from double* to i8*. We'd much rather use a double load+store rather than
74 // an i64 load+store, here because this improves the odds that the source or
75 // dest address will be promotable. See if we can find a better type than the
77 Value *StrippedDest = MI->getArgOperand(0)->stripPointerCasts();
78 if (StrippedDest != MI->getArgOperand(0)) {
79 const Type *SrcETy = cast<PointerType>(StrippedDest->getType())
81 if (TD && SrcETy->isSized() && TD->getTypeStoreSize(SrcETy) == Size) {
82 // The SrcETy might be something like {{{double}}} or [1 x double]. Rip
83 // down through these levels if so.
84 while (!SrcETy->isSingleValueType()) {
85 if (const StructType *STy = dyn_cast<StructType>(SrcETy)) {
86 if (STy->getNumElements() == 1)
87 SrcETy = STy->getElementType(0);
90 } else if (const ArrayType *ATy = dyn_cast<ArrayType>(SrcETy)) {
91 if (ATy->getNumElements() == 1)
92 SrcETy = ATy->getElementType();
99 if (SrcETy->isSingleValueType()) {
100 NewSrcPtrTy = PointerType::get(SrcETy, SrcAddrSp);
101 NewDstPtrTy = PointerType::get(SrcETy, DstAddrSp);
107 // If the memcpy/memmove provides better alignment info than we can
109 SrcAlign = std::max(SrcAlign, CopyAlign);
110 DstAlign = std::max(DstAlign, CopyAlign);
112 Value *Src = Builder->CreateBitCast(MI->getArgOperand(1), NewSrcPtrTy);
113 Value *Dest = Builder->CreateBitCast(MI->getArgOperand(0), NewDstPtrTy);
114 Instruction *L = new LoadInst(Src, "tmp", MI->isVolatile(), SrcAlign);
115 InsertNewInstBefore(L, *MI);
116 InsertNewInstBefore(new StoreInst(L, Dest, MI->isVolatile(), DstAlign),
119 // Set the size of the copy to 0, it will be deleted on the next iteration.
120 MI->setArgOperand(2, Constant::getNullValue(MemOpLength->getType()));
124 Instruction *InstCombiner::SimplifyMemSet(MemSetInst *MI) {
125 unsigned Alignment = getKnownAlignment(MI->getDest(), TD);
126 if (MI->getAlignment() < Alignment) {
127 MI->setAlignment(ConstantInt::get(MI->getAlignmentType(),
132 // Extract the length and alignment and fill if they are constant.
133 ConstantInt *LenC = dyn_cast<ConstantInt>(MI->getLength());
134 ConstantInt *FillC = dyn_cast<ConstantInt>(MI->getValue());
135 if (!LenC || !FillC || !FillC->getType()->isIntegerTy(8))
137 uint64_t Len = LenC->getZExtValue();
138 Alignment = MI->getAlignment();
140 // If the length is zero, this is a no-op
141 if (Len == 0) return MI; // memset(d,c,0,a) -> noop
143 // memset(s,c,n) -> store s, c (for n=1,2,4,8)
144 if (Len <= 8 && isPowerOf2_32((uint32_t)Len)) {
145 const Type *ITy = IntegerType::get(MI->getContext(), Len*8); // n=1 -> i8.
147 Value *Dest = MI->getDest();
148 unsigned DstAddrSp = cast<PointerType>(Dest->getType())->getAddressSpace();
149 Type *NewDstPtrTy = PointerType::get(ITy, DstAddrSp);
150 Dest = Builder->CreateBitCast(Dest, NewDstPtrTy);
152 // Alignment 0 is identity for alignment 1 for memset, but not store.
153 if (Alignment == 0) Alignment = 1;
155 // Extract the fill value and store.
156 uint64_t Fill = FillC->getZExtValue()*0x0101010101010101ULL;
157 InsertNewInstBefore(new StoreInst(ConstantInt::get(ITy, Fill),
158 Dest, false, Alignment), *MI);
160 // Set the size of the copy to 0, it will be deleted on the next iteration.
161 MI->setLength(Constant::getNullValue(LenC->getType()));
168 /// visitCallInst - CallInst simplification. This mostly only handles folding
169 /// of intrinsic instructions. For normal calls, it allows visitCallSite to do
170 /// the heavy lifting.
172 Instruction *InstCombiner::visitCallInst(CallInst &CI) {
174 return visitFree(CI);
176 return visitMalloc(CI);
178 // If the caller function is nounwind, mark the call as nounwind, even if the
180 if (CI.getParent()->getParent()->doesNotThrow() &&
181 !CI.doesNotThrow()) {
182 CI.setDoesNotThrow();
186 IntrinsicInst *II = dyn_cast<IntrinsicInst>(&CI);
187 if (!II) return visitCallSite(&CI);
189 // Intrinsics cannot occur in an invoke, so handle them here instead of in
191 if (MemIntrinsic *MI = dyn_cast<MemIntrinsic>(II)) {
192 bool Changed = false;
194 // memmove/cpy/set of zero bytes is a noop.
195 if (Constant *NumBytes = dyn_cast<Constant>(MI->getLength())) {
196 if (NumBytes->isNullValue())
197 return EraseInstFromFunction(CI);
199 if (ConstantInt *CI = dyn_cast<ConstantInt>(NumBytes))
200 if (CI->getZExtValue() == 1) {
201 // Replace the instruction with just byte operations. We would
202 // transform other cases to loads/stores, but we don't know if
203 // alignment is sufficient.
207 // No other transformations apply to volatile transfers.
208 if (MI->isVolatile())
211 // If we have a memmove and the source operation is a constant global,
212 // then the source and dest pointers can't alias, so we can change this
213 // into a call to memcpy.
214 if (MemMoveInst *MMI = dyn_cast<MemMoveInst>(MI)) {
215 if (GlobalVariable *GVSrc = dyn_cast<GlobalVariable>(MMI->getSource()))
216 if (GVSrc->isConstant()) {
217 Module *M = CI.getParent()->getParent()->getParent();
218 Intrinsic::ID MemCpyID = Intrinsic::memcpy;
219 const Type *Tys[3] = { CI.getArgOperand(0)->getType(),
220 CI.getArgOperand(1)->getType(),
221 CI.getArgOperand(2)->getType() };
222 CI.setCalledFunction(Intrinsic::getDeclaration(M, MemCpyID, Tys, 3));
227 if (MemTransferInst *MTI = dyn_cast<MemTransferInst>(MI)) {
228 // memmove(x,x,size) -> noop.
229 if (MTI->getSource() == MTI->getDest())
230 return EraseInstFromFunction(CI);
233 // If we can determine a pointer alignment that is bigger than currently
234 // set, update the alignment.
235 if (isa<MemTransferInst>(MI)) {
236 if (Instruction *I = SimplifyMemTransfer(MI))
238 } else if (MemSetInst *MSI = dyn_cast<MemSetInst>(MI)) {
239 if (Instruction *I = SimplifyMemSet(MSI))
243 if (Changed) return II;
246 switch (II->getIntrinsicID()) {
248 case Intrinsic::objectsize: {
249 // We need target data for just about everything so depend on it.
252 const Type *ReturnTy = CI.getType();
253 uint64_t DontKnow = II->getArgOperand(1) == Builder->getTrue() ? 0 : -1ULL;
255 // Get to the real allocated thing and offset as fast as possible.
256 Value *Op1 = II->getArgOperand(0)->stripPointerCasts();
259 uint64_t Size = -1ULL;
261 // Try to look through constant GEPs.
262 if (GEPOperator *GEP = dyn_cast<GEPOperator>(Op1)) {
263 if (!GEP->hasAllConstantIndices()) break;
265 // Get the current byte offset into the thing. Use the original
266 // operand in case we're looking through a bitcast.
267 SmallVector<Value*, 8> Ops(GEP->idx_begin(), GEP->idx_end());
268 Offset = TD->getIndexedOffset(GEP->getPointerOperandType(),
269 Ops.data(), Ops.size());
271 Op1 = GEP->getPointerOperand()->stripPointerCasts();
273 // Make sure we're not a constant offset from an external
275 if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Op1))
276 if (!GV->hasDefinitiveInitializer()) break;
279 // If we've stripped down to a single global variable that we
280 // can know the size of then just return that.
281 if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Op1)) {
282 if (GV->hasDefinitiveInitializer()) {
283 Constant *C = GV->getInitializer();
284 Size = TD->getTypeAllocSize(C->getType());
286 // Can't determine size of the GV.
287 Constant *RetVal = ConstantInt::get(ReturnTy, DontKnow);
288 return ReplaceInstUsesWith(CI, RetVal);
290 } else if (AllocaInst *AI = dyn_cast<AllocaInst>(Op1)) {
292 if (AI->getAllocatedType()->isSized()) {
293 Size = TD->getTypeAllocSize(AI->getAllocatedType());
294 if (AI->isArrayAllocation()) {
295 const ConstantInt *C = dyn_cast<ConstantInt>(AI->getArraySize());
297 Size *= C->getZExtValue();
300 } else if (CallInst *MI = extractMallocCall(Op1)) {
301 // Get allocation size.
302 const Type* MallocType = getMallocAllocatedType(MI);
303 if (MallocType && MallocType->isSized())
304 if (Value *NElems = getMallocArraySize(MI, TD, true))
305 if (ConstantInt *NElements = dyn_cast<ConstantInt>(NElems))
306 Size = NElements->getZExtValue() * TD->getTypeAllocSize(MallocType);
309 // Do not return "I don't know" here. Later optimization passes could
310 // make it possible to evaluate objectsize to a constant.
315 // Out of bound reference? Negative index normalized to large
316 // index? Just return "I don't know".
317 return ReplaceInstUsesWith(CI, ConstantInt::get(ReturnTy, DontKnow));
319 return ReplaceInstUsesWith(CI, ConstantInt::get(ReturnTy, Size-Offset));
321 case Intrinsic::bswap:
322 // bswap(bswap(x)) -> x
323 if (IntrinsicInst *Operand = dyn_cast<IntrinsicInst>(II->getArgOperand(0)))
324 if (Operand->getIntrinsicID() == Intrinsic::bswap)
325 return ReplaceInstUsesWith(CI, Operand->getArgOperand(0));
327 // bswap(trunc(bswap(x))) -> trunc(lshr(x, c))
328 if (TruncInst *TI = dyn_cast<TruncInst>(II->getArgOperand(0))) {
329 if (IntrinsicInst *Operand = dyn_cast<IntrinsicInst>(TI->getOperand(0)))
330 if (Operand->getIntrinsicID() == Intrinsic::bswap) {
331 unsigned C = Operand->getType()->getPrimitiveSizeInBits() -
332 TI->getType()->getPrimitiveSizeInBits();
333 Value *CV = ConstantInt::get(Operand->getType(), C);
334 Value *V = Builder->CreateLShr(Operand->getArgOperand(0), CV);
335 return new TruncInst(V, TI->getType());
340 case Intrinsic::powi:
341 if (ConstantInt *Power = dyn_cast<ConstantInt>(II->getArgOperand(1))) {
344 return ReplaceInstUsesWith(CI, ConstantFP::get(CI.getType(), 1.0));
347 return ReplaceInstUsesWith(CI, II->getArgOperand(0));
348 // powi(x, -1) -> 1/x
349 if (Power->isAllOnesValue())
350 return BinaryOperator::CreateFDiv(ConstantFP::get(CI.getType(), 1.0),
351 II->getArgOperand(0));
354 case Intrinsic::cttz: {
355 // If all bits below the first known one are known zero,
356 // this value is constant.
357 const IntegerType *IT = cast<IntegerType>(II->getArgOperand(0)->getType());
358 uint32_t BitWidth = IT->getBitWidth();
359 APInt KnownZero(BitWidth, 0);
360 APInt KnownOne(BitWidth, 0);
361 ComputeMaskedBits(II->getArgOperand(0), APInt::getAllOnesValue(BitWidth),
362 KnownZero, KnownOne);
363 unsigned TrailingZeros = KnownOne.countTrailingZeros();
364 APInt Mask(APInt::getLowBitsSet(BitWidth, TrailingZeros));
365 if ((Mask & KnownZero) == Mask)
366 return ReplaceInstUsesWith(CI, ConstantInt::get(IT,
367 APInt(BitWidth, TrailingZeros)));
371 case Intrinsic::ctlz: {
372 // If all bits above the first known one are known zero,
373 // this value is constant.
374 const IntegerType *IT = cast<IntegerType>(II->getArgOperand(0)->getType());
375 uint32_t BitWidth = IT->getBitWidth();
376 APInt KnownZero(BitWidth, 0);
377 APInt KnownOne(BitWidth, 0);
378 ComputeMaskedBits(II->getArgOperand(0), APInt::getAllOnesValue(BitWidth),
379 KnownZero, KnownOne);
380 unsigned LeadingZeros = KnownOne.countLeadingZeros();
381 APInt Mask(APInt::getHighBitsSet(BitWidth, LeadingZeros));
382 if ((Mask & KnownZero) == Mask)
383 return ReplaceInstUsesWith(CI, ConstantInt::get(IT,
384 APInt(BitWidth, LeadingZeros)));
388 case Intrinsic::uadd_with_overflow: {
389 Value *LHS = II->getArgOperand(0), *RHS = II->getArgOperand(1);
390 const IntegerType *IT = cast<IntegerType>(II->getArgOperand(0)->getType());
391 uint32_t BitWidth = IT->getBitWidth();
392 APInt Mask = APInt::getSignBit(BitWidth);
393 APInt LHSKnownZero(BitWidth, 0);
394 APInt LHSKnownOne(BitWidth, 0);
395 ComputeMaskedBits(LHS, Mask, LHSKnownZero, LHSKnownOne);
396 bool LHSKnownNegative = LHSKnownOne[BitWidth - 1];
397 bool LHSKnownPositive = LHSKnownZero[BitWidth - 1];
399 if (LHSKnownNegative || LHSKnownPositive) {
400 APInt RHSKnownZero(BitWidth, 0);
401 APInt RHSKnownOne(BitWidth, 0);
402 ComputeMaskedBits(RHS, Mask, RHSKnownZero, RHSKnownOne);
403 bool RHSKnownNegative = RHSKnownOne[BitWidth - 1];
404 bool RHSKnownPositive = RHSKnownZero[BitWidth - 1];
405 if (LHSKnownNegative && RHSKnownNegative) {
406 // The sign bit is set in both cases: this MUST overflow.
407 // Create a simple add instruction, and insert it into the struct.
408 Instruction *Add = BinaryOperator::CreateAdd(LHS, RHS, "", &CI);
411 UndefValue::get(LHS->getType()),ConstantInt::getTrue(II->getContext())
413 Constant *Struct = ConstantStruct::get(II->getContext(), V, 2, false);
414 return InsertValueInst::Create(Struct, Add, 0);
417 if (LHSKnownPositive && RHSKnownPositive) {
418 // The sign bit is clear in both cases: this CANNOT overflow.
419 // Create a simple add instruction, and insert it into the struct.
420 Instruction *Add = BinaryOperator::CreateNUWAdd(LHS, RHS, "", &CI);
423 UndefValue::get(LHS->getType()),
424 ConstantInt::getFalse(II->getContext())
426 Constant *Struct = ConstantStruct::get(II->getContext(), V, 2, false);
427 return InsertValueInst::Create(Struct, Add, 0);
431 // FALL THROUGH uadd into sadd
432 case Intrinsic::sadd_with_overflow:
433 // Canonicalize constants into the RHS.
434 if (isa<Constant>(II->getArgOperand(0)) &&
435 !isa<Constant>(II->getArgOperand(1))) {
436 Value *LHS = II->getArgOperand(0);
437 II->setArgOperand(0, II->getArgOperand(1));
438 II->setArgOperand(1, LHS);
442 // X + undef -> undef
443 if (isa<UndefValue>(II->getArgOperand(1)))
444 return ReplaceInstUsesWith(CI, UndefValue::get(II->getType()));
446 if (ConstantInt *RHS = dyn_cast<ConstantInt>(II->getArgOperand(1))) {
447 // X + 0 -> {X, false}
450 UndefValue::get(II->getArgOperand(0)->getType()),
451 ConstantInt::getFalse(II->getContext())
453 Constant *Struct = ConstantStruct::get(II->getContext(), V, 2, false);
454 return InsertValueInst::Create(Struct, II->getArgOperand(0), 0);
458 case Intrinsic::usub_with_overflow:
459 case Intrinsic::ssub_with_overflow:
460 // undef - X -> undef
461 // X - undef -> undef
462 if (isa<UndefValue>(II->getArgOperand(0)) ||
463 isa<UndefValue>(II->getArgOperand(1)))
464 return ReplaceInstUsesWith(CI, UndefValue::get(II->getType()));
466 if (ConstantInt *RHS = dyn_cast<ConstantInt>(II->getArgOperand(1))) {
467 // X - 0 -> {X, false}
470 UndefValue::get(II->getArgOperand(0)->getType()),
471 ConstantInt::getFalse(II->getContext())
473 Constant *Struct = ConstantStruct::get(II->getContext(), V, 2, false);
474 return InsertValueInst::Create(Struct, II->getArgOperand(0), 0);
478 case Intrinsic::umul_with_overflow: {
479 Value *LHS = II->getArgOperand(0), *RHS = II->getArgOperand(1);
480 unsigned BitWidth = cast<IntegerType>(LHS->getType())->getBitWidth();
481 APInt Mask = APInt::getAllOnesValue(BitWidth);
483 APInt LHSKnownZero(BitWidth, 0);
484 APInt LHSKnownOne(BitWidth, 0);
485 ComputeMaskedBits(LHS, Mask, LHSKnownZero, LHSKnownOne);
486 APInt RHSKnownZero(BitWidth, 0);
487 APInt RHSKnownOne(BitWidth, 0);
488 ComputeMaskedBits(RHS, Mask, RHSKnownZero, RHSKnownOne);
490 // Get the largest possible values for each operand.
491 APInt LHSMax = ~LHSKnownZero;
492 APInt RHSMax = ~RHSKnownZero;
494 // If multiplying the maximum values does not overflow then we can turn
495 // this into a plain NUW mul.
497 LHSMax.umul_ov(RHSMax, Overflow);
499 Value *Mul = Builder->CreateNUWMul(LHS, RHS, "umul_with_overflow");
501 UndefValue::get(LHS->getType()),
504 Constant *Struct = ConstantStruct::get(II->getContext(), V, 2, false);
505 return InsertValueInst::Create(Struct, Mul, 0);
508 case Intrinsic::smul_with_overflow:
509 // Canonicalize constants into the RHS.
510 if (isa<Constant>(II->getArgOperand(0)) &&
511 !isa<Constant>(II->getArgOperand(1))) {
512 Value *LHS = II->getArgOperand(0);
513 II->setArgOperand(0, II->getArgOperand(1));
514 II->setArgOperand(1, LHS);
518 // X * undef -> undef
519 if (isa<UndefValue>(II->getArgOperand(1)))
520 return ReplaceInstUsesWith(CI, UndefValue::get(II->getType()));
522 if (ConstantInt *RHSI = dyn_cast<ConstantInt>(II->getArgOperand(1))) {
525 return ReplaceInstUsesWith(CI, Constant::getNullValue(II->getType()));
527 // X * 1 -> {X, false}
528 if (RHSI->equalsInt(1)) {
530 UndefValue::get(II->getArgOperand(0)->getType()),
531 ConstantInt::getFalse(II->getContext())
533 Constant *Struct = ConstantStruct::get(II->getContext(), V, 2, false);
534 return InsertValueInst::Create(Struct, II->getArgOperand(0), 0);
538 case Intrinsic::ppc_altivec_lvx:
539 case Intrinsic::ppc_altivec_lvxl:
540 case Intrinsic::x86_sse_loadu_ps:
541 case Intrinsic::x86_sse2_loadu_pd:
542 case Intrinsic::x86_sse2_loadu_dq:
543 // Turn PPC lvx -> load if the pointer is known aligned.
544 // Turn X86 loadups -> load if the pointer is known aligned.
545 if (getOrEnforceKnownAlignment(II->getArgOperand(0), 16, TD) >= 16) {
546 Value *Ptr = Builder->CreateBitCast(II->getArgOperand(0),
547 PointerType::getUnqual(II->getType()));
548 return new LoadInst(Ptr);
551 case Intrinsic::ppc_altivec_stvx:
552 case Intrinsic::ppc_altivec_stvxl:
553 // Turn stvx -> store if the pointer is known aligned.
554 if (getOrEnforceKnownAlignment(II->getArgOperand(1), 16, TD) >= 16) {
555 const Type *OpPtrTy =
556 PointerType::getUnqual(II->getArgOperand(0)->getType());
557 Value *Ptr = Builder->CreateBitCast(II->getArgOperand(1), OpPtrTy);
558 return new StoreInst(II->getArgOperand(0), Ptr);
561 case Intrinsic::x86_sse_storeu_ps:
562 case Intrinsic::x86_sse2_storeu_pd:
563 case Intrinsic::x86_sse2_storeu_dq:
564 // Turn X86 storeu -> store if the pointer is known aligned.
565 if (getOrEnforceKnownAlignment(II->getArgOperand(0), 16, TD) >= 16) {
566 const Type *OpPtrTy =
567 PointerType::getUnqual(II->getArgOperand(1)->getType());
568 Value *Ptr = Builder->CreateBitCast(II->getArgOperand(0), OpPtrTy);
569 return new StoreInst(II->getArgOperand(1), Ptr);
573 case Intrinsic::x86_sse_cvtss2si:
574 case Intrinsic::x86_sse_cvtss2si64:
575 case Intrinsic::x86_sse_cvttss2si:
576 case Intrinsic::x86_sse_cvttss2si64:
577 case Intrinsic::x86_sse2_cvtsd2si:
578 case Intrinsic::x86_sse2_cvtsd2si64:
579 case Intrinsic::x86_sse2_cvttsd2si:
580 case Intrinsic::x86_sse2_cvttsd2si64: {
581 // These intrinsics only demand the 0th element of their input vectors. If
582 // we can simplify the input based on that, do so now.
584 cast<VectorType>(II->getArgOperand(0)->getType())->getNumElements();
585 APInt DemandedElts(VWidth, 1);
586 APInt UndefElts(VWidth, 0);
587 if (Value *V = SimplifyDemandedVectorElts(II->getArgOperand(0),
588 DemandedElts, UndefElts)) {
589 II->setArgOperand(0, V);
595 case Intrinsic::ppc_altivec_vperm:
596 // Turn vperm(V1,V2,mask) -> shuffle(V1,V2,mask) if mask is a constant.
597 if (ConstantVector *Mask = dyn_cast<ConstantVector>(II->getArgOperand(2))) {
598 assert(Mask->getNumOperands() == 16 && "Bad type for intrinsic!");
600 // Check that all of the elements are integer constants or undefs.
601 bool AllEltsOk = true;
602 for (unsigned i = 0; i != 16; ++i) {
603 if (!isa<ConstantInt>(Mask->getOperand(i)) &&
604 !isa<UndefValue>(Mask->getOperand(i))) {
611 // Cast the input vectors to byte vectors.
612 Value *Op0 = Builder->CreateBitCast(II->getArgOperand(0),
614 Value *Op1 = Builder->CreateBitCast(II->getArgOperand(1),
616 Value *Result = UndefValue::get(Op0->getType());
618 // Only extract each element once.
619 Value *ExtractedElts[32];
620 memset(ExtractedElts, 0, sizeof(ExtractedElts));
622 for (unsigned i = 0; i != 16; ++i) {
623 if (isa<UndefValue>(Mask->getOperand(i)))
625 unsigned Idx=cast<ConstantInt>(Mask->getOperand(i))->getZExtValue();
626 Idx &= 31; // Match the hardware behavior.
628 if (ExtractedElts[Idx] == 0) {
630 Builder->CreateExtractElement(Idx < 16 ? Op0 : Op1,
631 ConstantInt::get(Type::getInt32Ty(II->getContext()),
632 Idx&15, false), "tmp");
635 // Insert this value into the result vector.
636 Result = Builder->CreateInsertElement(Result, ExtractedElts[Idx],
637 ConstantInt::get(Type::getInt32Ty(II->getContext()),
640 return CastInst::Create(Instruction::BitCast, Result, CI.getType());
645 case Intrinsic::arm_neon_vld1:
646 case Intrinsic::arm_neon_vld2:
647 case Intrinsic::arm_neon_vld3:
648 case Intrinsic::arm_neon_vld4:
649 case Intrinsic::arm_neon_vld2lane:
650 case Intrinsic::arm_neon_vld3lane:
651 case Intrinsic::arm_neon_vld4lane:
652 case Intrinsic::arm_neon_vst1:
653 case Intrinsic::arm_neon_vst2:
654 case Intrinsic::arm_neon_vst3:
655 case Intrinsic::arm_neon_vst4:
656 case Intrinsic::arm_neon_vst2lane:
657 case Intrinsic::arm_neon_vst3lane:
658 case Intrinsic::arm_neon_vst4lane: {
659 unsigned MemAlign = getKnownAlignment(II->getArgOperand(0), TD);
660 unsigned AlignArg = II->getNumArgOperands() - 1;
661 ConstantInt *IntrAlign = dyn_cast<ConstantInt>(II->getArgOperand(AlignArg));
662 if (IntrAlign && IntrAlign->getZExtValue() < MemAlign) {
663 II->setArgOperand(AlignArg,
664 ConstantInt::get(Type::getInt32Ty(II->getContext()),
671 case Intrinsic::stackrestore: {
672 // If the save is right next to the restore, remove the restore. This can
673 // happen when variable allocas are DCE'd.
674 if (IntrinsicInst *SS = dyn_cast<IntrinsicInst>(II->getArgOperand(0))) {
675 if (SS->getIntrinsicID() == Intrinsic::stacksave) {
676 BasicBlock::iterator BI = SS;
678 return EraseInstFromFunction(CI);
682 // Scan down this block to see if there is another stack restore in the
683 // same block without an intervening call/alloca.
684 BasicBlock::iterator BI = II;
685 TerminatorInst *TI = II->getParent()->getTerminator();
686 bool CannotRemove = false;
687 for (++BI; &*BI != TI; ++BI) {
688 if (isa<AllocaInst>(BI) || isMalloc(BI)) {
692 if (CallInst *BCI = dyn_cast<CallInst>(BI)) {
693 if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(BCI)) {
694 // If there is a stackrestore below this one, remove this one.
695 if (II->getIntrinsicID() == Intrinsic::stackrestore)
696 return EraseInstFromFunction(CI);
697 // Otherwise, ignore the intrinsic.
699 // If we found a non-intrinsic call, we can't remove the stack
707 // If the stack restore is in a return/unwind block and if there are no
708 // allocas or calls between the restore and the return, nuke the restore.
709 if (!CannotRemove && (isa<ReturnInst>(TI) || isa<UnwindInst>(TI)))
710 return EraseInstFromFunction(CI);
715 return visitCallSite(II);
718 // InvokeInst simplification
720 Instruction *InstCombiner::visitInvokeInst(InvokeInst &II) {
721 return visitCallSite(&II);
724 /// isSafeToEliminateVarargsCast - If this cast does not affect the value
725 /// passed through the varargs area, we can eliminate the use of the cast.
726 static bool isSafeToEliminateVarargsCast(const CallSite CS,
727 const CastInst * const CI,
728 const TargetData * const TD,
730 if (!CI->isLosslessCast())
733 // The size of ByVal arguments is derived from the type, so we
734 // can't change to a type with a different size. If the size were
735 // passed explicitly we could avoid this check.
736 if (!CS.paramHasAttr(ix, Attribute::ByVal))
740 cast<PointerType>(CI->getOperand(0)->getType())->getElementType();
741 const Type* DstTy = cast<PointerType>(CI->getType())->getElementType();
742 if (!SrcTy->isSized() || !DstTy->isSized())
744 if (!TD || TD->getTypeAllocSize(SrcTy) != TD->getTypeAllocSize(DstTy))
750 class InstCombineFortifiedLibCalls : public SimplifyFortifiedLibCalls {
753 void replaceCall(Value *With) {
754 NewInstruction = IC->ReplaceInstUsesWith(*CI, With);
756 bool isFoldable(unsigned SizeCIOp, unsigned SizeArgOp, bool isString) const {
757 if (CI->getArgOperand(SizeCIOp) == CI->getArgOperand(SizeArgOp))
759 if (ConstantInt *SizeCI =
760 dyn_cast<ConstantInt>(CI->getArgOperand(SizeCIOp))) {
761 if (SizeCI->isAllOnesValue())
764 uint64_t Len = GetStringLength(CI->getArgOperand(SizeArgOp));
765 // If the length is 0 we don't know how long it is and so we can't
767 if (Len == 0) return false;
768 return SizeCI->getZExtValue() >= Len;
770 if (ConstantInt *Arg = dyn_cast<ConstantInt>(
771 CI->getArgOperand(SizeArgOp)))
772 return SizeCI->getZExtValue() >= Arg->getZExtValue();
777 InstCombineFortifiedLibCalls(InstCombiner *IC) : IC(IC), NewInstruction(0) { }
778 Instruction *NewInstruction;
780 } // end anonymous namespace
782 // Try to fold some different type of calls here.
783 // Currently we're only working with the checking functions, memcpy_chk,
784 // mempcpy_chk, memmove_chk, memset_chk, strcpy_chk, stpcpy_chk, strncpy_chk,
785 // strcat_chk and strncat_chk.
786 Instruction *InstCombiner::tryOptimizeCall(CallInst *CI, const TargetData *TD) {
787 if (CI->getCalledFunction() == 0) return 0;
789 InstCombineFortifiedLibCalls Simplifier(this);
790 Simplifier.fold(CI, TD);
791 return Simplifier.NewInstruction;
794 // visitCallSite - Improvements for call and invoke instructions.
796 Instruction *InstCombiner::visitCallSite(CallSite CS) {
797 bool Changed = false;
799 // If the callee is a pointer to a function, attempt to move any casts to the
800 // arguments of the call/invoke.
801 Value *Callee = CS.getCalledValue();
802 if (!isa<Function>(Callee) && transformConstExprCastCall(CS))
805 if (Function *CalleeF = dyn_cast<Function>(Callee))
806 // If the call and callee calling conventions don't match, this call must
807 // be unreachable, as the call is undefined.
808 if (CalleeF->getCallingConv() != CS.getCallingConv() &&
809 // Only do this for calls to a function with a body. A prototype may
810 // not actually end up matching the implementation's calling conv for a
811 // variety of reasons (e.g. it may be written in assembly).
812 !CalleeF->isDeclaration()) {
813 Instruction *OldCall = CS.getInstruction();
814 new StoreInst(ConstantInt::getTrue(Callee->getContext()),
815 UndefValue::get(Type::getInt1PtrTy(Callee->getContext())),
817 // If OldCall dues not return void then replaceAllUsesWith undef.
818 // This allows ValueHandlers and custom metadata to adjust itself.
819 if (!OldCall->getType()->isVoidTy())
820 OldCall->replaceAllUsesWith(UndefValue::get(OldCall->getType()));
821 if (isa<CallInst>(OldCall))
822 return EraseInstFromFunction(*OldCall);
824 // We cannot remove an invoke, because it would change the CFG, just
825 // change the callee to a null pointer.
826 cast<InvokeInst>(OldCall)->setCalledFunction(
827 Constant::getNullValue(CalleeF->getType()));
831 if (isa<ConstantPointerNull>(Callee) || isa<UndefValue>(Callee)) {
832 // This instruction is not reachable, just remove it. We insert a store to
833 // undef so that we know that this code is not reachable, despite the fact
834 // that we can't modify the CFG here.
835 new StoreInst(ConstantInt::getTrue(Callee->getContext()),
836 UndefValue::get(Type::getInt1PtrTy(Callee->getContext())),
837 CS.getInstruction());
839 // If CS does not return void then replaceAllUsesWith undef.
840 // This allows ValueHandlers and custom metadata to adjust itself.
841 if (!CS.getInstruction()->getType()->isVoidTy())
842 CS.getInstruction()->
843 replaceAllUsesWith(UndefValue::get(CS.getInstruction()->getType()));
845 if (InvokeInst *II = dyn_cast<InvokeInst>(CS.getInstruction())) {
846 // Don't break the CFG, insert a dummy cond branch.
847 BranchInst::Create(II->getNormalDest(), II->getUnwindDest(),
848 ConstantInt::getTrue(Callee->getContext()), II);
850 return EraseInstFromFunction(*CS.getInstruction());
853 if (BitCastInst *BC = dyn_cast<BitCastInst>(Callee))
854 if (IntrinsicInst *In = dyn_cast<IntrinsicInst>(BC->getOperand(0)))
855 if (In->getIntrinsicID() == Intrinsic::init_trampoline)
856 return transformCallThroughTrampoline(CS);
858 const PointerType *PTy = cast<PointerType>(Callee->getType());
859 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
860 if (FTy->isVarArg()) {
861 int ix = FTy->getNumParams() + (isa<InvokeInst>(Callee) ? 3 : 1);
862 // See if we can optimize any arguments passed through the varargs area of
864 for (CallSite::arg_iterator I = CS.arg_begin()+FTy->getNumParams(),
865 E = CS.arg_end(); I != E; ++I, ++ix) {
866 CastInst *CI = dyn_cast<CastInst>(*I);
867 if (CI && isSafeToEliminateVarargsCast(CS, CI, TD, ix)) {
868 *I = CI->getOperand(0);
874 if (isa<InlineAsm>(Callee) && !CS.doesNotThrow()) {
875 // Inline asm calls cannot throw - mark them 'nounwind'.
876 CS.setDoesNotThrow();
880 // Try to optimize the call if possible, we require TargetData for most of
881 // this. None of these calls are seen as possibly dead so go ahead and
882 // delete the instruction now.
883 if (CallInst *CI = dyn_cast<CallInst>(CS.getInstruction())) {
884 Instruction *I = tryOptimizeCall(CI, TD);
885 // If we changed something return the result, etc. Otherwise let
886 // the fallthrough check.
887 if (I) return EraseInstFromFunction(*I);
890 return Changed ? CS.getInstruction() : 0;
893 // transformConstExprCastCall - If the callee is a constexpr cast of a function,
894 // attempt to move the cast to the arguments of the call/invoke.
896 bool InstCombiner::transformConstExprCastCall(CallSite CS) {
898 dyn_cast<Function>(CS.getCalledValue()->stripPointerCasts());
901 Instruction *Caller = CS.getInstruction();
902 const AttrListPtr &CallerPAL = CS.getAttributes();
904 // Okay, this is a cast from a function to a different type. Unless doing so
905 // would cause a type conversion of one of our arguments, change this call to
906 // be a direct call with arguments casted to the appropriate types.
908 const FunctionType *FT = Callee->getFunctionType();
909 const Type *OldRetTy = Caller->getType();
910 const Type *NewRetTy = FT->getReturnType();
912 if (NewRetTy->isStructTy())
913 return false; // TODO: Handle multiple return values.
915 // Check to see if we are changing the return type...
916 if (OldRetTy != NewRetTy) {
917 if (Callee->isDeclaration() &&
918 // Conversion is ok if changing from one pointer type to another or from
919 // a pointer to an integer of the same size.
920 !((OldRetTy->isPointerTy() || !TD ||
921 OldRetTy == TD->getIntPtrType(Caller->getContext())) &&
922 (NewRetTy->isPointerTy() || !TD ||
923 NewRetTy == TD->getIntPtrType(Caller->getContext()))))
924 return false; // Cannot transform this return value.
926 if (!Caller->use_empty() &&
927 // void -> non-void is handled specially
928 !NewRetTy->isVoidTy() && !CastInst::isCastable(NewRetTy, OldRetTy))
929 return false; // Cannot transform this return value.
931 if (!CallerPAL.isEmpty() && !Caller->use_empty()) {
932 Attributes RAttrs = CallerPAL.getRetAttributes();
933 if (RAttrs & Attribute::typeIncompatible(NewRetTy))
934 return false; // Attribute not compatible with transformed value.
937 // If the callsite is an invoke instruction, and the return value is used by
938 // a PHI node in a successor, we cannot change the return type of the call
939 // because there is no place to put the cast instruction (without breaking
940 // the critical edge). Bail out in this case.
941 if (!Caller->use_empty())
942 if (InvokeInst *II = dyn_cast<InvokeInst>(Caller))
943 for (Value::use_iterator UI = II->use_begin(), E = II->use_end();
945 if (PHINode *PN = dyn_cast<PHINode>(*UI))
946 if (PN->getParent() == II->getNormalDest() ||
947 PN->getParent() == II->getUnwindDest())
951 unsigned NumActualArgs = unsigned(CS.arg_end()-CS.arg_begin());
952 unsigned NumCommonArgs = std::min(FT->getNumParams(), NumActualArgs);
954 CallSite::arg_iterator AI = CS.arg_begin();
955 for (unsigned i = 0, e = NumCommonArgs; i != e; ++i, ++AI) {
956 const Type *ParamTy = FT->getParamType(i);
957 const Type *ActTy = (*AI)->getType();
959 if (!CastInst::isCastable(ActTy, ParamTy))
960 return false; // Cannot transform this parameter value.
962 unsigned Attrs = CallerPAL.getParamAttributes(i + 1);
963 if (Attrs & Attribute::typeIncompatible(ParamTy))
964 return false; // Attribute not compatible with transformed value.
966 // If the parameter is passed as a byval argument, then we have to have a
967 // sized type and the sized type has to have the same size as the old type.
968 if (ParamTy != ActTy && (Attrs & Attribute::ByVal)) {
969 const PointerType *ParamPTy = dyn_cast<PointerType>(ParamTy);
970 if (ParamPTy == 0 || !ParamPTy->getElementType()->isSized() || TD == 0)
973 const Type *CurElTy = cast<PointerType>(ActTy)->getElementType();
974 if (TD->getTypeAllocSize(CurElTy) !=
975 TD->getTypeAllocSize(ParamPTy->getElementType()))
979 // Converting from one pointer type to another or between a pointer and an
980 // integer of the same size is safe even if we do not have a body.
981 bool isConvertible = ActTy == ParamTy ||
982 (TD && ((ParamTy->isPointerTy() ||
983 ParamTy == TD->getIntPtrType(Caller->getContext())) &&
984 (ActTy->isPointerTy() ||
985 ActTy == TD->getIntPtrType(Caller->getContext()))));
986 if (Callee->isDeclaration() && !isConvertible) return false;
989 if (Callee->isDeclaration()) {
990 // Do not delete arguments unless we have a function body.
991 if (FT->getNumParams() < NumActualArgs && !FT->isVarArg())
994 // If the callee is just a declaration, don't change the varargsness of the
995 // call. We don't want to introduce a varargs call where one doesn't
997 const PointerType *APTy = cast<PointerType>(CS.getCalledValue()->getType());
998 if (FT->isVarArg()!=cast<FunctionType>(APTy->getElementType())->isVarArg())
1002 if (FT->getNumParams() < NumActualArgs && FT->isVarArg() &&
1003 !CallerPAL.isEmpty())
1004 // In this case we have more arguments than the new function type, but we
1005 // won't be dropping them. Check that these extra arguments have attributes
1006 // that are compatible with being a vararg call argument.
1007 for (unsigned i = CallerPAL.getNumSlots(); i; --i) {
1008 if (CallerPAL.getSlot(i - 1).Index <= FT->getNumParams())
1010 Attributes PAttrs = CallerPAL.getSlot(i - 1).Attrs;
1011 if (PAttrs & Attribute::VarArgsIncompatible)
1016 // Okay, we decided that this is a safe thing to do: go ahead and start
1017 // inserting cast instructions as necessary.
1018 std::vector<Value*> Args;
1019 Args.reserve(NumActualArgs);
1020 SmallVector<AttributeWithIndex, 8> attrVec;
1021 attrVec.reserve(NumCommonArgs);
1023 // Get any return attributes.
1024 Attributes RAttrs = CallerPAL.getRetAttributes();
1026 // If the return value is not being used, the type may not be compatible
1027 // with the existing attributes. Wipe out any problematic attributes.
1028 RAttrs &= ~Attribute::typeIncompatible(NewRetTy);
1030 // Add the new return attributes.
1032 attrVec.push_back(AttributeWithIndex::get(0, RAttrs));
1034 AI = CS.arg_begin();
1035 for (unsigned i = 0; i != NumCommonArgs; ++i, ++AI) {
1036 const Type *ParamTy = FT->getParamType(i);
1037 if ((*AI)->getType() == ParamTy) {
1038 Args.push_back(*AI);
1040 Instruction::CastOps opcode = CastInst::getCastOpcode(*AI,
1041 false, ParamTy, false);
1042 Args.push_back(Builder->CreateCast(opcode, *AI, ParamTy, "tmp"));
1045 // Add any parameter attributes.
1046 if (Attributes PAttrs = CallerPAL.getParamAttributes(i + 1))
1047 attrVec.push_back(AttributeWithIndex::get(i + 1, PAttrs));
1050 // If the function takes more arguments than the call was taking, add them
1052 for (unsigned i = NumCommonArgs; i != FT->getNumParams(); ++i)
1053 Args.push_back(Constant::getNullValue(FT->getParamType(i)));
1055 // If we are removing arguments to the function, emit an obnoxious warning.
1056 if (FT->getNumParams() < NumActualArgs) {
1057 if (!FT->isVarArg()) {
1058 errs() << "WARNING: While resolving call to function '"
1059 << Callee->getName() << "' arguments were dropped!\n";
1061 // Add all of the arguments in their promoted form to the arg list.
1062 for (unsigned i = FT->getNumParams(); i != NumActualArgs; ++i, ++AI) {
1063 const Type *PTy = getPromotedType((*AI)->getType());
1064 if (PTy != (*AI)->getType()) {
1065 // Must promote to pass through va_arg area!
1066 Instruction::CastOps opcode =
1067 CastInst::getCastOpcode(*AI, false, PTy, false);
1068 Args.push_back(Builder->CreateCast(opcode, *AI, PTy, "tmp"));
1070 Args.push_back(*AI);
1073 // Add any parameter attributes.
1074 if (Attributes PAttrs = CallerPAL.getParamAttributes(i + 1))
1075 attrVec.push_back(AttributeWithIndex::get(i + 1, PAttrs));
1080 if (Attributes FnAttrs = CallerPAL.getFnAttributes())
1081 attrVec.push_back(AttributeWithIndex::get(~0, FnAttrs));
1083 if (NewRetTy->isVoidTy())
1084 Caller->setName(""); // Void type should not have a name.
1086 const AttrListPtr &NewCallerPAL = AttrListPtr::get(attrVec.begin(),
1090 if (InvokeInst *II = dyn_cast<InvokeInst>(Caller)) {
1091 NC = InvokeInst::Create(Callee, II->getNormalDest(), II->getUnwindDest(),
1092 Args.begin(), Args.end(),
1093 Caller->getName(), Caller);
1094 cast<InvokeInst>(NC)->setCallingConv(II->getCallingConv());
1095 cast<InvokeInst>(NC)->setAttributes(NewCallerPAL);
1097 NC = CallInst::Create(Callee, Args.begin(), Args.end(),
1098 Caller->getName(), Caller);
1099 CallInst *CI = cast<CallInst>(Caller);
1100 if (CI->isTailCall())
1101 cast<CallInst>(NC)->setTailCall();
1102 cast<CallInst>(NC)->setCallingConv(CI->getCallingConv());
1103 cast<CallInst>(NC)->setAttributes(NewCallerPAL);
1106 // Insert a cast of the return type as necessary.
1108 if (OldRetTy != NV->getType() && !Caller->use_empty()) {
1109 if (!NV->getType()->isVoidTy()) {
1110 Instruction::CastOps opcode =
1111 CastInst::getCastOpcode(NC, false, OldRetTy, false);
1112 NV = NC = CastInst::Create(opcode, NC, OldRetTy, "tmp");
1114 // If this is an invoke instruction, we should insert it after the first
1115 // non-phi, instruction in the normal successor block.
1116 if (InvokeInst *II = dyn_cast<InvokeInst>(Caller)) {
1117 BasicBlock::iterator I = II->getNormalDest()->getFirstNonPHI();
1118 InsertNewInstBefore(NC, *I);
1120 // Otherwise, it's a call, just insert cast right after the call.
1121 InsertNewInstBefore(NC, *Caller);
1123 Worklist.AddUsersToWorkList(*Caller);
1125 NV = UndefValue::get(Caller->getType());
1129 if (!Caller->use_empty())
1130 Caller->replaceAllUsesWith(NV);
1132 EraseInstFromFunction(*Caller);
1136 // transformCallThroughTrampoline - Turn a call to a function created by the
1137 // init_trampoline intrinsic into a direct call to the underlying function.
1139 Instruction *InstCombiner::transformCallThroughTrampoline(CallSite CS) {
1140 Value *Callee = CS.getCalledValue();
1141 const PointerType *PTy = cast<PointerType>(Callee->getType());
1142 const FunctionType *FTy = cast<FunctionType>(PTy->getElementType());
1143 const AttrListPtr &Attrs = CS.getAttributes();
1145 // If the call already has the 'nest' attribute somewhere then give up -
1146 // otherwise 'nest' would occur twice after splicing in the chain.
1147 if (Attrs.hasAttrSomewhere(Attribute::Nest))
1150 IntrinsicInst *Tramp =
1151 cast<IntrinsicInst>(cast<BitCastInst>(Callee)->getOperand(0));
1153 Function *NestF =cast<Function>(Tramp->getArgOperand(1)->stripPointerCasts());
1154 const PointerType *NestFPTy = cast<PointerType>(NestF->getType());
1155 const FunctionType *NestFTy = cast<FunctionType>(NestFPTy->getElementType());
1157 const AttrListPtr &NestAttrs = NestF->getAttributes();
1158 if (!NestAttrs.isEmpty()) {
1159 unsigned NestIdx = 1;
1160 const Type *NestTy = 0;
1161 Attributes NestAttr = Attribute::None;
1163 // Look for a parameter marked with the 'nest' attribute.
1164 for (FunctionType::param_iterator I = NestFTy->param_begin(),
1165 E = NestFTy->param_end(); I != E; ++NestIdx, ++I)
1166 if (NestAttrs.paramHasAttr(NestIdx, Attribute::Nest)) {
1167 // Record the parameter type and any other attributes.
1169 NestAttr = NestAttrs.getParamAttributes(NestIdx);
1174 Instruction *Caller = CS.getInstruction();
1175 std::vector<Value*> NewArgs;
1176 NewArgs.reserve(unsigned(CS.arg_end()-CS.arg_begin())+1);
1178 SmallVector<AttributeWithIndex, 8> NewAttrs;
1179 NewAttrs.reserve(Attrs.getNumSlots() + 1);
1181 // Insert the nest argument into the call argument list, which may
1182 // mean appending it. Likewise for attributes.
1184 // Add any result attributes.
1185 if (Attributes Attr = Attrs.getRetAttributes())
1186 NewAttrs.push_back(AttributeWithIndex::get(0, Attr));
1190 CallSite::arg_iterator I = CS.arg_begin(), E = CS.arg_end();
1192 if (Idx == NestIdx) {
1193 // Add the chain argument and attributes.
1194 Value *NestVal = Tramp->getArgOperand(2);
1195 if (NestVal->getType() != NestTy)
1196 NestVal = new BitCastInst(NestVal, NestTy, "nest", Caller);
1197 NewArgs.push_back(NestVal);
1198 NewAttrs.push_back(AttributeWithIndex::get(NestIdx, NestAttr));
1204 // Add the original argument and attributes.
1205 NewArgs.push_back(*I);
1206 if (Attributes Attr = Attrs.getParamAttributes(Idx))
1208 (AttributeWithIndex::get(Idx + (Idx >= NestIdx), Attr));
1214 // Add any function attributes.
1215 if (Attributes Attr = Attrs.getFnAttributes())
1216 NewAttrs.push_back(AttributeWithIndex::get(~0, Attr));
1218 // The trampoline may have been bitcast to a bogus type (FTy).
1219 // Handle this by synthesizing a new function type, equal to FTy
1220 // with the chain parameter inserted.
1222 std::vector<const Type*> NewTypes;
1223 NewTypes.reserve(FTy->getNumParams()+1);
1225 // Insert the chain's type into the list of parameter types, which may
1226 // mean appending it.
1229 FunctionType::param_iterator I = FTy->param_begin(),
1230 E = FTy->param_end();
1234 // Add the chain's type.
1235 NewTypes.push_back(NestTy);
1240 // Add the original type.
1241 NewTypes.push_back(*I);
1247 // Replace the trampoline call with a direct call. Let the generic
1248 // code sort out any function type mismatches.
1249 FunctionType *NewFTy = FunctionType::get(FTy->getReturnType(), NewTypes,
1251 Constant *NewCallee =
1252 NestF->getType() == PointerType::getUnqual(NewFTy) ?
1253 NestF : ConstantExpr::getBitCast(NestF,
1254 PointerType::getUnqual(NewFTy));
1255 const AttrListPtr &NewPAL = AttrListPtr::get(NewAttrs.begin(),
1258 Instruction *NewCaller;
1259 if (InvokeInst *II = dyn_cast<InvokeInst>(Caller)) {
1260 NewCaller = InvokeInst::Create(NewCallee,
1261 II->getNormalDest(), II->getUnwindDest(),
1262 NewArgs.begin(), NewArgs.end(),
1263 Caller->getName(), Caller);
1264 cast<InvokeInst>(NewCaller)->setCallingConv(II->getCallingConv());
1265 cast<InvokeInst>(NewCaller)->setAttributes(NewPAL);
1267 NewCaller = CallInst::Create(NewCallee, NewArgs.begin(), NewArgs.end(),
1268 Caller->getName(), Caller);
1269 if (cast<CallInst>(Caller)->isTailCall())
1270 cast<CallInst>(NewCaller)->setTailCall();
1271 cast<CallInst>(NewCaller)->
1272 setCallingConv(cast<CallInst>(Caller)->getCallingConv());
1273 cast<CallInst>(NewCaller)->setAttributes(NewPAL);
1275 if (!Caller->getType()->isVoidTy())
1276 Caller->replaceAllUsesWith(NewCaller);
1277 Caller->eraseFromParent();
1278 Worklist.Remove(Caller);
1283 // Replace the trampoline call with a direct call. Since there is no 'nest'
1284 // parameter, there is no need to adjust the argument list. Let the generic
1285 // code sort out any function type mismatches.
1286 Constant *NewCallee =
1287 NestF->getType() == PTy ? NestF :
1288 ConstantExpr::getBitCast(NestF, PTy);
1289 CS.setCalledFunction(NewCallee);
1290 return CS.getInstruction();