InstCombineCalls.cpp revision 0b8c9a80f20772c3793201ab5b251d3520b9cea3
1d2fa56687f8bd5ac6ebf9d9468d0efd714986a54Ted Kremenek//===- InstCombineCalls.cpp -----------------------------------------------===// 2d2fa56687f8bd5ac6ebf9d9468d0efd714986a54Ted Kremenek// 3d2fa56687f8bd5ac6ebf9d9468d0efd714986a54Ted Kremenek// The LLVM Compiler Infrastructure 4d2fa56687f8bd5ac6ebf9d9468d0efd714986a54Ted Kremenek// 5d2fa56687f8bd5ac6ebf9d9468d0efd714986a54Ted Kremenek// This file is distributed under the University of Illinois Open Source 6d2fa56687f8bd5ac6ebf9d9468d0efd714986a54Ted Kremenek// License. See LICENSE.TXT for details. 7d2fa56687f8bd5ac6ebf9d9468d0efd714986a54Ted Kremenek// 8d2fa56687f8bd5ac6ebf9d9468d0efd714986a54Ted Kremenek//===----------------------------------------------------------------------===// 9d2fa56687f8bd5ac6ebf9d9468d0efd714986a54Ted Kremenek// 10d2fa56687f8bd5ac6ebf9d9468d0efd714986a54Ted Kremenek// This file implements the visitCall and visitInvoke functions. 11d2fa56687f8bd5ac6ebf9d9468d0efd714986a54Ted Kremenek// 12d2fa56687f8bd5ac6ebf9d9468d0efd714986a54Ted Kremenek//===----------------------------------------------------------------------===// 13d2fa56687f8bd5ac6ebf9d9468d0efd714986a54Ted Kremenek 14d2fa56687f8bd5ac6ebf9d9468d0efd714986a54Ted Kremenek#include "InstCombine.h" 15d2fa56687f8bd5ac6ebf9d9468d0efd714986a54Ted Kremenek#include "llvm/ADT/Statistic.h" 16d2fa56687f8bd5ac6ebf9d9468d0efd714986a54Ted Kremenek#include "llvm/Analysis/MemoryBuiltins.h" 17d2fa56687f8bd5ac6ebf9d9468d0efd714986a54Ted Kremenek#include "llvm/IR/DataLayout.h" 18d2fa56687f8bd5ac6ebf9d9468d0efd714986a54Ted Kremenek#include "llvm/Support/CallSite.h" 1988145034694ed5267fa6fa5febc54fadc02bd479Steve Naroff#include "llvm/Support/PatternMatch.h" 203d31560343856c573376a04558a7111e7afad4f7Chandler Carruth#include "llvm/Transforms/Utils/BuildLibCalls.h" 210a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor#include "llvm/Transforms/Utils/Local.h" 2288145034694ed5267fa6fa5febc54fadc02bd479Steve Naroffusing namespace llvm; 23d2fa56687f8bd5ac6ebf9d9468d0efd714986a54Ted Kremenekusing namespace PatternMatch; 24d2fa56687f8bd5ac6ebf9d9468d0efd714986a54Ted Kremenek 25d2fa56687f8bd5ac6ebf9d9468d0efd714986a54Ted KremenekSTATISTIC(NumSimplified, "Number of library calls simplified"); 26d2fa56687f8bd5ac6ebf9d9468d0efd714986a54Ted Kremenek 2788145034694ed5267fa6fa5febc54fadc02bd479Steve Naroff/// getPromotedType - Return the specified type promoted as it would be to pass 282e06fc877a633abea3b40a64950c7316dac29ca8John Thompson/// though a va_arg area. 292e06fc877a633abea3b40a64950c7316dac29ca8John Thompsonstatic Type *getPromotedType(Type *Ty) { 302e06fc877a633abea3b40a64950c7316dac29ca8John Thompson if (IntegerType* ITy = dyn_cast<IntegerType>(Ty)) { 312e06fc877a633abea3b40a64950c7316dac29ca8John Thompson if (ITy->getBitWidth() < 32) 322e06fc877a633abea3b40a64950c7316dac29ca8John Thompson return Type::getInt32Ty(Ty->getContext()); 332e06fc877a633abea3b40a64950c7316dac29ca8John Thompson } 342e06fc877a633abea3b40a64950c7316dac29ca8John Thompson return Ty; 352e06fc877a633abea3b40a64950c7316dac29ca8John Thompson} 362e06fc877a633abea3b40a64950c7316dac29ca8John Thompson 372e06fc877a633abea3b40a64950c7316dac29ca8John Thompson/// reduceToSingleValueType - Given an aggregate type which ultimately holds a 3820d416c36b46dd19ee0b1ea2d0266ae43be86e51Douglas Gregor/// single scalar element, like {{{type}}} or [1 x type], return type. 3920d416c36b46dd19ee0b1ea2d0266ae43be86e51Douglas Gregorstatic Type *reduceToSingleValueType(Type *T) { 401efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar while (!T->isSingleValueType()) { 41f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor if (StructType *STy = dyn_cast<StructType>(T)) { 42f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor if (STy->getNumElements() == 1) 43f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor T = STy->getElementType(0); 44f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor else 45f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor break; 461efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar } else if (ArrayType *ATy = dyn_cast<ArrayType>(T)) { 47f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor if (ATy->getNumElements() == 1) 48f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor T = ATy->getElementType(); 49f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor else 501efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar break; 511efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar } else 52f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor break; 5320d416c36b46dd19ee0b1ea2d0266ae43be86e51Douglas Gregor } 5420d416c36b46dd19ee0b1ea2d0266ae43be86e51Douglas Gregor 5520d416c36b46dd19ee0b1ea2d0266ae43be86e51Douglas Gregor return T; 561efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar} 577f17376e0931a337d544b75d9030bc92763be287Douglas Gregor 587f17376e0931a337d544b75d9030bc92763be287Douglas GregorInstruction *InstCombiner::SimplifyMemTransfer(MemIntrinsic *MI) { 597f17376e0931a337d544b75d9030bc92763be287Douglas Gregor unsigned DstAlign = getKnownAlignment(MI->getArgOperand(0), TD); 607f17376e0931a337d544b75d9030bc92763be287Douglas Gregor unsigned SrcAlign = getKnownAlignment(MI->getArgOperand(1), TD); 617f17376e0931a337d544b75d9030bc92763be287Douglas Gregor unsigned MinAlign = std::min(DstAlign, SrcAlign); 62600866cc7d6d9ec2e27d4b6d6ec461f6463b5ab6Steve Naroff unsigned CopyAlign = MI->getAlignment(); 637f17376e0931a337d544b75d9030bc92763be287Douglas Gregor 647f17376e0931a337d544b75d9030bc92763be287Douglas Gregor if (CopyAlign < MinAlign) { 657f17376e0931a337d544b75d9030bc92763be287Douglas Gregor MI->setAlignment(ConstantInt::get(MI->getAlignmentType(), 6650398199fb10e196a8d92fbf7a062dbe42ed88fdSteve Naroff MinAlign, false)); 67600866cc7d6d9ec2e27d4b6d6ec461f6463b5ab6Steve Naroff return MI; 687f17376e0931a337d544b75d9030bc92763be287Douglas Gregor } 69c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 70c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // If MemCpyInst length is 1/2/4/8 bytes then replace memcpy with 717f17376e0931a337d544b75d9030bc92763be287Douglas Gregor // load/store. 72c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor ConstantInt *MemOpLength = dyn_cast<ConstantInt>(MI->getArgOperand(2)); 731efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar if (MemOpLength == 0) return 0; 74735df88a38e80c1ca70daa889aa516b8b9f54b50Douglas Gregor 75735df88a38e80c1ca70daa889aa516b8b9f54b50Douglas Gregor // Source and destination pointer types are always "i8*" for intrinsic. See 76735df88a38e80c1ca70daa889aa516b8b9f54b50Douglas Gregor // if the size is something we can handle with a single primitive load/store. 77735df88a38e80c1ca70daa889aa516b8b9f54b50Douglas Gregor // A single load+store correctly handles overlapping memory in the memmove 78735df88a38e80c1ca70daa889aa516b8b9f54b50Douglas Gregor // case. 79735df88a38e80c1ca70daa889aa516b8b9f54b50Douglas Gregor uint64_t Size = MemOpLength->getLimitedValue(); 80735df88a38e80c1ca70daa889aa516b8b9f54b50Douglas Gregor assert(Size && "0-sized memory transfering should be removed already."); 81735df88a38e80c1ca70daa889aa516b8b9f54b50Douglas Gregor 821efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar if (Size > 8 || (Size&(Size-1))) 831efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar return 0; // If not 1/2/4/8 bytes, exit. 84735df88a38e80c1ca70daa889aa516b8b9f54b50Douglas Gregor 85735df88a38e80c1ca70daa889aa516b8b9f54b50Douglas Gregor // Use an integer load+store unless we can find something better. 86735df88a38e80c1ca70daa889aa516b8b9f54b50Douglas Gregor unsigned SrcAddrSp = 87735df88a38e80c1ca70daa889aa516b8b9f54b50Douglas Gregor cast<PointerType>(MI->getArgOperand(1)->getType())->getAddressSpace(); 88735df88a38e80c1ca70daa889aa516b8b9f54b50Douglas Gregor unsigned DstAddrSp = 891efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar cast<PointerType>(MI->getArgOperand(0)->getType())->getAddressSpace(); 90c8dfe5ece04e683106eb96c58a2999f70b53ac21Douglas Gregor 91735df88a38e80c1ca70daa889aa516b8b9f54b50Douglas Gregor IntegerType* IntType = IntegerType::get(MI->getContext(), Size<<3); 92735df88a38e80c1ca70daa889aa516b8b9f54b50Douglas Gregor Type *NewSrcPtrTy = PointerType::get(IntType, SrcAddrSp); 93735df88a38e80c1ca70daa889aa516b8b9f54b50Douglas Gregor Type *NewDstPtrTy = PointerType::get(IntType, DstAddrSp); 94735df88a38e80c1ca70daa889aa516b8b9f54b50Douglas Gregor 95c8dfe5ece04e683106eb96c58a2999f70b53ac21Douglas Gregor // Memcpy forces the use of i8* for the source and destination. That means 96735df88a38e80c1ca70daa889aa516b8b9f54b50Douglas Gregor // that if you're using memcpy to move one double around, you'll get a cast 97735df88a38e80c1ca70daa889aa516b8b9f54b50Douglas Gregor // from double* to i8*. We'd much rather use a double load+store rather than 98735df88a38e80c1ca70daa889aa516b8b9f54b50Douglas Gregor // an i64 load+store, here because this improves the odds that the source or 99735df88a38e80c1ca70daa889aa516b8b9f54b50Douglas Gregor // dest address will be promotable. See if we can find a better type than the 100076c22a99ed82e11b59e8fbf57d8467ceb3fec77Peter Collingbourne // integer datatype. 101076c22a99ed82e11b59e8fbf57d8467ceb3fec77Peter Collingbourne Value *StrippedDest = MI->getArgOperand(0)->stripPointerCasts(); 102076c22a99ed82e11b59e8fbf57d8467ceb3fec77Peter Collingbourne MDNode *CopyMD = 0; 103076c22a99ed82e11b59e8fbf57d8467ceb3fec77Peter Collingbourne if (StrippedDest != MI->getArgOperand(0)) { 104076c22a99ed82e11b59e8fbf57d8467ceb3fec77Peter Collingbourne Type *SrcETy = cast<PointerType>(StrippedDest->getType()) 10558ddb60f409125eda5436c4a1f070f7fa4744295Douglas Gregor ->getElementType(); 106076c22a99ed82e11b59e8fbf57d8467ceb3fec77Peter Collingbourne if (TD && SrcETy->isSized() && TD->getTypeStoreSize(SrcETy) == Size) { 107076c22a99ed82e11b59e8fbf57d8467ceb3fec77Peter Collingbourne // The SrcETy might be something like {{{double}}} or [1 x double]. Rip 108076c22a99ed82e11b59e8fbf57d8467ceb3fec77Peter Collingbourne // down through these levels if so. 10958ddb60f409125eda5436c4a1f070f7fa4744295Douglas Gregor SrcETy = reduceToSingleValueType(SrcETy); 110076c22a99ed82e11b59e8fbf57d8467ceb3fec77Peter Collingbourne 111076c22a99ed82e11b59e8fbf57d8467ceb3fec77Peter Collingbourne if (SrcETy->isSingleValueType()) { 112076c22a99ed82e11b59e8fbf57d8467ceb3fec77Peter Collingbourne NewSrcPtrTy = PointerType::get(SrcETy, SrcAddrSp); 113076c22a99ed82e11b59e8fbf57d8467ceb3fec77Peter Collingbourne NewDstPtrTy = PointerType::get(SrcETy, DstAddrSp); 11458ddb60f409125eda5436c4a1f070f7fa4744295Douglas Gregor 115076c22a99ed82e11b59e8fbf57d8467ceb3fec77Peter Collingbourne // If the memcpy has metadata describing the members, see if we can 116076c22a99ed82e11b59e8fbf57d8467ceb3fec77Peter Collingbourne // get the TBAA tag describing our copy. 117076c22a99ed82e11b59e8fbf57d8467ceb3fec77Peter Collingbourne if (MDNode *M = MI->getMetadata(LLVMContext::MD_tbaa_struct)) { 11858ddb60f409125eda5436c4a1f070f7fa4744295Douglas Gregor if (M->getNumOperands() == 3 && 11958ddb60f409125eda5436c4a1f070f7fa4744295Douglas Gregor M->getOperand(0) && 12058ddb60f409125eda5436c4a1f070f7fa4744295Douglas Gregor isa<ConstantInt>(M->getOperand(0)) && 1217f17376e0931a337d544b75d9030bc92763be287Douglas Gregor cast<ConstantInt>(M->getOperand(0))->isNullValue() && 1227f17376e0931a337d544b75d9030bc92763be287Douglas Gregor M->getOperand(1) && 1237f17376e0931a337d544b75d9030bc92763be287Douglas Gregor isa<ConstantInt>(M->getOperand(1)) && 1247f17376e0931a337d544b75d9030bc92763be287Douglas Gregor cast<ConstantInt>(M->getOperand(1))->getValue() == Size && 1257f17376e0931a337d544b75d9030bc92763be287Douglas Gregor M->getOperand(2) && 1261efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar isa<MDNode>(M->getOperand(2))) 1277f17376e0931a337d544b75d9030bc92763be287Douglas Gregor CopyMD = cast<MDNode>(M->getOperand(2)); 1287f17376e0931a337d544b75d9030bc92763be287Douglas Gregor } 1297f17376e0931a337d544b75d9030bc92763be287Douglas Gregor } 1307f17376e0931a337d544b75d9030bc92763be287Douglas Gregor } 1317f17376e0931a337d544b75d9030bc92763be287Douglas Gregor } 1327f17376e0931a337d544b75d9030bc92763be287Douglas Gregor 1337f17376e0931a337d544b75d9030bc92763be287Douglas Gregor // If the memcpy/memmove provides better alignment info than we can 134ef0cef6cec8de5fc60e469a93436eed7212e0dc2Steve Naroff // infer, use it. 135ef0cef6cec8de5fc60e469a93436eed7212e0dc2Steve Naroff SrcAlign = std::max(SrcAlign, CopyAlign); 136ef0cef6cec8de5fc60e469a93436eed7212e0dc2Steve Naroff DstAlign = std::max(DstAlign, CopyAlign); 137ef0cef6cec8de5fc60e469a93436eed7212e0dc2Steve Naroff 138ef0cef6cec8de5fc60e469a93436eed7212e0dc2Steve Naroff Value *Src = Builder->CreateBitCast(MI->getArgOperand(1), NewSrcPtrTy); 139ef0cef6cec8de5fc60e469a93436eed7212e0dc2Steve Naroff Value *Dest = Builder->CreateBitCast(MI->getArgOperand(0), NewDstPtrTy); 140ef0cef6cec8de5fc60e469a93436eed7212e0dc2Steve Naroff LoadInst *L = Builder->CreateLoad(Src, MI->isVolatile()); 141ef0cef6cec8de5fc60e469a93436eed7212e0dc2Steve Naroff L->setAlignment(SrcAlign); 1427f17376e0931a337d544b75d9030bc92763be287Douglas Gregor if (CopyMD) 1437f17376e0931a337d544b75d9030bc92763be287Douglas Gregor L->setMetadata(LLVMContext::MD_tbaa, CopyMD); 1447f17376e0931a337d544b75d9030bc92763be287Douglas Gregor StoreInst *S = Builder->CreateStore(L, Dest, MI->isVolatile()); 145ef0cef6cec8de5fc60e469a93436eed7212e0dc2Steve Naroff S->setAlignment(DstAlign); 146ef0cef6cec8de5fc60e469a93436eed7212e0dc2Steve Naroff if (CopyMD) 1477f17376e0931a337d544b75d9030bc92763be287Douglas Gregor S->setMetadata(LLVMContext::MD_tbaa, CopyMD); 1487f17376e0931a337d544b75d9030bc92763be287Douglas Gregor 1497f17376e0931a337d544b75d9030bc92763be287Douglas Gregor // Set the size of the copy to 0, it will be deleted on the next iteration. 150ef0cef6cec8de5fc60e469a93436eed7212e0dc2Steve Naroff MI->setArgOperand(2, Constant::getNullValue(MemOpLength->getType())); 151ef0cef6cec8de5fc60e469a93436eed7212e0dc2Steve Naroff return MI; 1527f17376e0931a337d544b75d9030bc92763be287Douglas Gregor} 1537f17376e0931a337d544b75d9030bc92763be287Douglas Gregor 1547f17376e0931a337d544b75d9030bc92763be287Douglas GregorInstruction *InstCombiner::SimplifyMemSet(MemSetInst *MI) { 1551efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar unsigned Alignment = getKnownAlignment(MI->getDest(), TD); 1561efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar if (MI->getAlignment() < Alignment) { 157e56b4baeba5097852e04bc41ca2e0396cf729955Steve Naroff MI->setAlignment(ConstantInt::get(MI->getAlignmentType(), 158e56b4baeba5097852e04bc41ca2e0396cf729955Steve Naroff Alignment, false)); 159e56b4baeba5097852e04bc41ca2e0396cf729955Steve Naroff return MI; 160e56b4baeba5097852e04bc41ca2e0396cf729955Steve Naroff } 161e56b4baeba5097852e04bc41ca2e0396cf729955Steve Naroff 1621efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar // Extract the length and alignment and fill if they are constant. 163e56b4baeba5097852e04bc41ca2e0396cf729955Steve Naroff ConstantInt *LenC = dyn_cast<ConstantInt>(MI->getLength()); 164e56b4baeba5097852e04bc41ca2e0396cf729955Steve Naroff ConstantInt *FillC = dyn_cast<ConstantInt>(MI->getValue()); 165e56b4baeba5097852e04bc41ca2e0396cf729955Steve Naroff if (!LenC || !FillC || !FillC->getType()->isIntegerTy(8)) 166b4ece6377d95e35a8df01cd010d910c34d690f67Steve Naroff return 0; 167b4ece6377d95e35a8df01cd010d910c34d690f67Steve Naroff uint64_t Len = LenC->getLimitedValue(); 1680a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor Alignment = MI->getAlignment(); 1690a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor assert(Len && "0-sized memory setting should be removed already."); 170b4ece6377d95e35a8df01cd010d910c34d690f67Steve Naroff 171b4ece6377d95e35a8df01cd010d910c34d690f67Steve Naroff // memset(s,c,n) -> store s, c (for n=1,2,4,8) 172b4ece6377d95e35a8df01cd010d910c34d690f67Steve Naroff if (Len <= 8 && isPowerOf2_32((uint32_t)Len)) { 173b4ece6377d95e35a8df01cd010d910c34d690f67Steve Naroff Type *ITy = IntegerType::get(MI->getContext(), Len*8); // n=1 -> i8. 174b4ece6377d95e35a8df01cd010d910c34d690f67Steve Naroff 175b4ece6377d95e35a8df01cd010d910c34d690f67Steve Naroff Value *Dest = MI->getDest(); 1761efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar unsigned DstAddrSp = cast<PointerType>(Dest->getType())->getAddressSpace(); 177002a528ab0189fc60cfbf9328962c96ccbe567eeDouglas Gregor Type *NewDstPtrTy = PointerType::get(ITy, DstAddrSp); 178b4ece6377d95e35a8df01cd010d910c34d690f67Steve Naroff Dest = Builder->CreateBitCast(Dest, NewDstPtrTy); 179b4ece6377d95e35a8df01cd010d910c34d690f67Steve Naroff 180b4ece6377d95e35a8df01cd010d910c34d690f67Steve Naroff // Alignment 0 is identity for alignment 1 for memset, but not store. 181b4ece6377d95e35a8df01cd010d910c34d690f67Steve Naroff if (Alignment == 0) Alignment = 1; 182fd9f23464bfd35314c87c4df410f3937d59eb96dDaniel Dunbar 183fd9f23464bfd35314c87c4df410f3937d59eb96dDaniel Dunbar // Extract the fill value and store. 184fd9f23464bfd35314c87c4df410f3937d59eb96dDaniel Dunbar uint64_t Fill = FillC->getZExtValue()*0x0101010101010101ULL; 185b2cd48756119f4d8d2a865b4b3e0e8efd02e26a0Douglas Gregor StoreInst *S = Builder->CreateStore(ConstantInt::get(ITy, Fill), Dest, 186b2cd48756119f4d8d2a865b4b3e0e8efd02e26a0Douglas Gregor MI->isVolatile()); 187b4ece6377d95e35a8df01cd010d910c34d690f67Steve Naroff S->setAlignment(Alignment); 188b4ece6377d95e35a8df01cd010d910c34d690f67Steve Naroff 189b4ece6377d95e35a8df01cd010d910c34d690f67Steve Naroff // Set the size of the copy to 0, it will be deleted on the next iteration. 190b4ece6377d95e35a8df01cd010d910c34d690f67Steve Naroff MI->setLength(Constant::getNullValue(LenC->getType())); 191b4ece6377d95e35a8df01cd010d910c34d690f67Steve Naroff return MI; 192e56b4baeba5097852e04bc41ca2e0396cf729955Steve Naroff } 1930a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor 1940a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor return 0; 195896b70ffc348f6e2c680b5fb5841984d5785b7b5Ted Kremenek} 1960087e1a12b67b6bb032a72ea485a863daeccf55bDouglas Gregor 1970087e1a12b67b6bb032a72ea485a863daeccf55bDouglas Gregor/// visitCallInst - CallInst simplification. This mostly only handles folding 1980087e1a12b67b6bb032a72ea485a863daeccf55bDouglas Gregor/// of intrinsic instructions. For normal calls, it allows visitCallSite to do 1990087e1a12b67b6bb032a72ea485a863daeccf55bDouglas Gregor/// the heavy lifting. 2000087e1a12b67b6bb032a72ea485a863daeccf55bDouglas Gregor/// 2010087e1a12b67b6bb032a72ea485a863daeccf55bDouglas GregorInstruction *InstCombiner::visitCallInst(CallInst &CI) { 2028506dde586459887b7e14e23a30af8ac5be5adb6Daniel Dunbar if (isFreeCall(&CI, TLI)) 2031efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar return visitFree(CI); 2041efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar 205c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // If the caller function is nounwind, mark the call as nounwind, even if the 206f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor // callee isn't. 207f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor if (CI.getParent()->getParent()->doesNotThrow() && 208f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor !CI.doesNotThrow()) { 2091efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar CI.setDoesNotThrow(); 210f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor return &CI; 211f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor } 212f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor 213f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor IntrinsicInst *II = dyn_cast<IntrinsicInst>(&CI); 2141efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar if (!II) return visitCallSite(&CI); 215f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor 216f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor // Intrinsics cannot occur in an invoke, so handle them here instead of in 217f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor // visitCallSite. 21888145034694ed5267fa6fa5febc54fadc02bd479Steve Naroff if (MemIntrinsic *MI = dyn_cast<MemIntrinsic>(II)) { 21974844072411bae91d5dbb89955d200cbe1e0a1c8Ted Kremenek bool Changed = false; 2201efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar 221f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor // memmove/cpy/set of zero bytes is a noop. 222f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor if (Constant *NumBytes = dyn_cast<Constant>(MI->getLength())) { 223f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor if (NumBytes->isNullValue()) 22408b0e8daeb683686b876d72674962ad96df21d45Douglas Gregor return EraseInstFromFunction(CI); 22588145034694ed5267fa6fa5febc54fadc02bd479Steve Naroff 2263c7313d96cd4a18cd8c1fcd3ddd8128c2fcbe58fDouglas Gregor if (ConstantInt *CI = dyn_cast<ConstantInt>(NumBytes)) 227b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor if (CI->getZExtValue() == 1) { 228b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor // Replace the instruction with just byte operations. We would 229b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor // transform other cases to loads/stores, but we don't know if 2301efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar // alignment is sufficient. 231b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor } 232b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor } 233b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor 234b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor // No other transformations apply to volatile transfers. 235b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor if (MI->isVolatile()) 2361efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar return 0; 237b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor 2381efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar // If we have a memmove and the source operation is a constant global, 239b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor // then the source and dest pointers can't alias, so we can change this 240f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor // into a call to memcpy. 241f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor if (MemMoveInst *MMI = dyn_cast<MemMoveInst>(MI)) { 242f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor if (GlobalVariable *GVSrc = dyn_cast<GlobalVariable>(MMI->getSource())) 243f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor if (GVSrc->isConstant()) { 244f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor Module *M = CI.getParent()->getParent()->getParent(); 245f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor Intrinsic::ID MemCpyID = Intrinsic::memcpy; 246f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor Type *Tys[3] = { CI.getArgOperand(0)->getType(), 247f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor CI.getArgOperand(1)->getType(), 248f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor CI.getArgOperand(2)->getType() }; 249f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor CI.setCalledFunction(Intrinsic::getDeclaration(M, MemCpyID, Tys)); 250f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor Changed = true; 251f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor } 252f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor } 253f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor 254f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor if (MemTransferInst *MTI = dyn_cast<MemTransferInst>(MI)) { 2551efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar // memmove(x,x,size) -> noop. 256f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor if (MTI->getSource() == MTI->getDest()) 2571db19dea8d221f27be46332d668d1e2decb7f1abDouglas Gregor return EraseInstFromFunction(CI); 2581db19dea8d221f27be46332d668d1e2decb7f1abDouglas Gregor } 2591db19dea8d221f27be46332d668d1e2decb7f1abDouglas Gregor 2601db19dea8d221f27be46332d668d1e2decb7f1abDouglas Gregor // If we can determine a pointer alignment that is bigger than currently 2611db19dea8d221f27be46332d668d1e2decb7f1abDouglas Gregor // set, update the alignment. 2623c7313d96cd4a18cd8c1fcd3ddd8128c2fcbe58fDouglas Gregor if (isa<MemTransferInst>(MI)) { 2633c7313d96cd4a18cd8c1fcd3ddd8128c2fcbe58fDouglas Gregor if (Instruction *I = SimplifyMemTransfer(MI)) 2645352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor return I; 2651db19dea8d221f27be46332d668d1e2decb7f1abDouglas Gregor } else if (MemSetInst *MSI = dyn_cast<MemSetInst>(MI)) { 2663c7313d96cd4a18cd8c1fcd3ddd8128c2fcbe58fDouglas Gregor if (Instruction *I = SimplifyMemSet(MSI)) 267fe6fd3d41a7f48317d6856c9327b6cead32c3498Ted Kremenek return I; 2683c7313d96cd4a18cd8c1fcd3ddd8128c2fcbe58fDouglas Gregor } 269d52864bd33c66aacc84133460d8c9c0dfcdd5c18Daniel Dunbar 2703c7313d96cd4a18cd8c1fcd3ddd8128c2fcbe58fDouglas Gregor if (Changed) return II; 2711db19dea8d221f27be46332d668d1e2decb7f1abDouglas Gregor } 2721db19dea8d221f27be46332d668d1e2decb7f1abDouglas Gregor 2733c7313d96cd4a18cd8c1fcd3ddd8128c2fcbe58fDouglas Gregor switch (II->getIntrinsicID()) { 2743c7313d96cd4a18cd8c1fcd3ddd8128c2fcbe58fDouglas Gregor default: break; 2755352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor case Intrinsic::objectsize: { 2761db19dea8d221f27be46332d668d1e2decb7f1abDouglas Gregor uint64_t Size; 2771db19dea8d221f27be46332d668d1e2decb7f1abDouglas Gregor if (getObjectSize(II->getArgOperand(0), Size, TD, TLI)) 2783c7313d96cd4a18cd8c1fcd3ddd8128c2fcbe58fDouglas Gregor return ReplaceInstUsesWith(CI, ConstantInt::get(CI.getType(), Size)); 279fe6fd3d41a7f48317d6856c9327b6cead32c3498Ted Kremenek return 0; 2801db19dea8d221f27be46332d668d1e2decb7f1abDouglas Gregor } 281b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor case Intrinsic::bswap: { 282b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor Value *IIOperand = II->getArgOperand(0); 283b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor Value *X = 0; 2841efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar 285b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor // bswap(bswap(x)) -> x 286b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor if (match(IIOperand, m_BSwap(m_Value(X)))) 2871efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar return ReplaceInstUsesWith(CI, X); 288b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor 289b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor // bswap(trunc(bswap(x))) -> trunc(lshr(x, c)) 290b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor if (match(IIOperand, m_Trunc(m_BSwap(m_Value(X))))) { 291b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor unsigned C = X->getType()->getPrimitiveSizeInBits() - 292b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor IIOperand->getType()->getPrimitiveSizeInBits(); 293b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor Value *CV = ConstantInt::get(X->getType(), C); 294b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor Value *V = Builder->CreateLShr(X, CV); 2951efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar return new TruncInst(V, IIOperand->getType()); 296b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor } 2971efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar break; 2981efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar } 299b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor 300b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor case Intrinsic::powi: 301b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor if (ConstantInt *Power = dyn_cast<ConstantInt>(II->getArgOperand(1))) { 302b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor // powi(x, 0) -> 1.0 303b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor if (Power->isZero()) 30483889a7f1f338e343ef72aeeef9c27f7b62c0f0fDavid Chisnall return ReplaceInstUsesWith(CI, ConstantFP::get(CI.getType(), 1.0)); 30583889a7f1f338e343ef72aeeef9c27f7b62c0f0fDavid Chisnall // powi(x, 1) -> x 30683889a7f1f338e343ef72aeeef9c27f7b62c0f0fDavid Chisnall if (Power->isOne()) 30783889a7f1f338e343ef72aeeef9c27f7b62c0f0fDavid Chisnall return ReplaceInstUsesWith(CI, II->getArgOperand(0)); 30883889a7f1f338e343ef72aeeef9c27f7b62c0f0fDavid Chisnall // powi(x, -1) -> 1/x 30983889a7f1f338e343ef72aeeef9c27f7b62c0f0fDavid Chisnall if (Power->isAllOnesValue()) 31083889a7f1f338e343ef72aeeef9c27f7b62c0f0fDavid Chisnall return BinaryOperator::CreateFDiv(ConstantFP::get(CI.getType(), 1.0), 3111efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar II->getArgOperand(0)); 312b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor } 3135352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor break; 3145352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor case Intrinsic::cttz: { 3155352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor // If all bits below the first known one are known zero, 316896b70ffc348f6e2c680b5fb5841984d5785b7b5Ted Kremenek // this value is constant. 3175352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor IntegerType *IT = dyn_cast<IntegerType>(II->getArgOperand(0)->getType()); 318b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor // FIXME: Try to simplify vectors of integers. 319b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor if (!IT) break; 320b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor uint32_t BitWidth = IT->getBitWidth(); 321b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor APInt KnownZero(BitWidth, 0); 322b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor APInt KnownOne(BitWidth, 0); 3231efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar ComputeMaskedBits(II->getArgOperand(0), KnownZero, KnownOne); 324b979034b100be14de2223f2b8f6cc7a3275cbe4fDouglas Gregor unsigned TrailingZeros = KnownOne.countTrailingZeros(); 32546766dc31c09d89024de5aba9e22112a56eadbdfDouglas Gregor APInt Mask(APInt::getLowBitsSet(BitWidth, TrailingZeros)); 32646766dc31c09d89024de5aba9e22112a56eadbdfDouglas Gregor if ((Mask & KnownZero) == Mask) 3271db19dea8d221f27be46332d668d1e2decb7f1abDouglas Gregor return ReplaceInstUsesWith(CI, ConstantInt::get(IT, 3281efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar APInt(BitWidth, TrailingZeros))); 3291efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar 3301db19dea8d221f27be46332d668d1e2decb7f1abDouglas Gregor } 3311efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar break; 3321db19dea8d221f27be46332d668d1e2decb7f1abDouglas Gregor case Intrinsic::ctlz: { 3331db19dea8d221f27be46332d668d1e2decb7f1abDouglas Gregor // If all bits above the first known one are known zero, 3341efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar // this value is constant. 3351db19dea8d221f27be46332d668d1e2decb7f1abDouglas Gregor IntegerType *IT = dyn_cast<IntegerType>(II->getArgOperand(0)->getType()); 3361db19dea8d221f27be46332d668d1e2decb7f1abDouglas Gregor // FIXME: Try to simplify vectors of integers. 3371efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar if (!IT) break; 3381efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar uint32_t BitWidth = IT->getBitWidth(); 33946766dc31c09d89024de5aba9e22112a56eadbdfDouglas Gregor APInt KnownZero(BitWidth, 0); 34046766dc31c09d89024de5aba9e22112a56eadbdfDouglas Gregor APInt KnownOne(BitWidth, 0); 34146766dc31c09d89024de5aba9e22112a56eadbdfDouglas Gregor ComputeMaskedBits(II->getArgOperand(0), KnownZero, KnownOne); 3421db19dea8d221f27be46332d668d1e2decb7f1abDouglas Gregor unsigned LeadingZeros = KnownOne.countLeadingZeros(); 3431db19dea8d221f27be46332d668d1e2decb7f1abDouglas Gregor APInt Mask(APInt::getHighBitsSet(BitWidth, LeadingZeros)); 3441db19dea8d221f27be46332d668d1e2decb7f1abDouglas Gregor if ((Mask & KnownZero) == Mask) 3451db19dea8d221f27be46332d668d1e2decb7f1abDouglas Gregor return ReplaceInstUsesWith(CI, ConstantInt::get(IT, 34646766dc31c09d89024de5aba9e22112a56eadbdfDouglas Gregor APInt(BitWidth, LeadingZeros))); 34746766dc31c09d89024de5aba9e22112a56eadbdfDouglas Gregor 348e69517ce61638f12c9abe4605753a45275ac4e37Douglas Gregor } 349e69517ce61638f12c9abe4605753a45275ac4e37Douglas Gregor break; 3501efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar case Intrinsic::uadd_with_overflow: { 3511efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar Value *LHS = II->getArgOperand(0), *RHS = II->getArgOperand(1); 3521db19dea8d221f27be46332d668d1e2decb7f1abDouglas Gregor IntegerType *IT = cast<IntegerType>(II->getArgOperand(0)->getType()); 3531db19dea8d221f27be46332d668d1e2decb7f1abDouglas Gregor uint32_t BitWidth = IT->getBitWidth(); 3541db19dea8d221f27be46332d668d1e2decb7f1abDouglas Gregor APInt LHSKnownZero(BitWidth, 0); 3551db19dea8d221f27be46332d668d1e2decb7f1abDouglas Gregor APInt LHSKnownOne(BitWidth, 0); 3561efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar ComputeMaskedBits(LHS, LHSKnownZero, LHSKnownOne); 3571efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar bool LHSKnownNegative = LHSKnownOne[BitWidth - 1]; 3581db19dea8d221f27be46332d668d1e2decb7f1abDouglas Gregor bool LHSKnownPositive = LHSKnownZero[BitWidth - 1]; 3591db19dea8d221f27be46332d668d1e2decb7f1abDouglas Gregor 3601db19dea8d221f27be46332d668d1e2decb7f1abDouglas Gregor if (LHSKnownNegative || LHSKnownPositive) { 361f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor APInt RHSKnownZero(BitWidth, 0); 362f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor APInt RHSKnownOne(BitWidth, 0); 363f55254472e496340cbb4f0a24cff398e441475b5Douglas Gregor ComputeMaskedBits(RHS, RHSKnownZero, RHSKnownOne); 364c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor bool RHSKnownNegative = RHSKnownOne[BitWidth - 1]; 365c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor bool RHSKnownPositive = RHSKnownZero[BitWidth - 1]; 3665352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor if (LHSKnownNegative && RHSKnownNegative) { 3675352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor // The sign bit is set in both cases: this MUST overflow. 3685352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor // Create a simple add instruction, and insert it into the struct. 3695352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor Value *Add = Builder->CreateAdd(LHS, RHS); 3705352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor Add->takeName(&CI); 3715352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor Constant *V[] = { 3725352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor UndefValue::get(LHS->getType()), 3735352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor ConstantInt::getTrue(II->getContext()) 3745352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor }; 3755352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor StructType *ST = cast<StructType>(II->getType()); 376896b70ffc348f6e2c680b5fb5841984d5785b7b5Ted Kremenek Constant *Struct = ConstantStruct::get(ST, V); 3775352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor return InsertValueInst::Create(Struct, Add, 0); 3785352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor } 3795352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor 380896b70ffc348f6e2c680b5fb5841984d5785b7b5Ted Kremenek if (LHSKnownPositive && RHSKnownPositive) { 3815352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor // The sign bit is clear in both cases: this CANNOT overflow. 3825352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor // Create a simple add instruction, and insert it into the struct. 3835352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor Value *Add = Builder->CreateNUWAdd(LHS, RHS); 3845352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor Add->takeName(&CI); 3855352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor Constant *V[] = { 3865352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor UndefValue::get(LHS->getType()), 3875352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor ConstantInt::getFalse(II->getContext()) 3885352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor }; 3895352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor StructType *ST = cast<StructType>(II->getType()); 3905352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor Constant *Struct = ConstantStruct::get(ST, V); 3915352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor return InsertValueInst::Create(Struct, Add, 0); 3925352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor } 3935352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor } 3945352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor } 3955352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor // FALL THROUGH uadd into sadd 3965352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor case Intrinsic::sadd_with_overflow: 3975352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor // Canonicalize constants into the RHS. 3985352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor if (isa<Constant>(II->getArgOperand(0)) && 3995352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor !isa<Constant>(II->getArgOperand(1))) { 4005352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor Value *LHS = II->getArgOperand(0); 4015352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor II->setArgOperand(0, II->getArgOperand(1)); 4025352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor II->setArgOperand(1, LHS); 4035352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor return II; 4045352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor } 4055352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor 4065352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor // X + undef -> undef 4075352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor if (isa<UndefValue>(II->getArgOperand(1))) 4085352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor return ReplaceInstUsesWith(CI, UndefValue::get(II->getType())); 4095352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor 4105352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor if (ConstantInt *RHS = dyn_cast<ConstantInt>(II->getArgOperand(1))) { 4115352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor // X + 0 -> {X, false} 4125352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor if (RHS->isZero()) { 413a88084b78fd4ca5d3d858c14b02414f8cc399f02Douglas Gregor Constant *V[] = { 414a88084b78fd4ca5d3d858c14b02414f8cc399f02Douglas Gregor UndefValue::get(II->getArgOperand(0)->getType()), 415a88084b78fd4ca5d3d858c14b02414f8cc399f02Douglas Gregor ConstantInt::getFalse(II->getContext()) 416a88084b78fd4ca5d3d858c14b02414f8cc399f02Douglas Gregor }; 417a88084b78fd4ca5d3d858c14b02414f8cc399f02Douglas Gregor Constant *Struct = 418a88084b78fd4ca5d3d858c14b02414f8cc399f02Douglas Gregor ConstantStruct::get(cast<StructType>(II->getType()), V); 419a88084b78fd4ca5d3d858c14b02414f8cc399f02Douglas Gregor return InsertValueInst::Create(Struct, II->getArgOperand(0), 0); 4205352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor } 421a88084b78fd4ca5d3d858c14b02414f8cc399f02Douglas Gregor } 422a88084b78fd4ca5d3d858c14b02414f8cc399f02Douglas Gregor break; 4235352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor case Intrinsic::usub_with_overflow: 424a88084b78fd4ca5d3d858c14b02414f8cc399f02Douglas Gregor case Intrinsic::ssub_with_overflow: 425a88084b78fd4ca5d3d858c14b02414f8cc399f02Douglas Gregor // undef - X -> undef 4265352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor // X - undef -> undef 427a88084b78fd4ca5d3d858c14b02414f8cc399f02Douglas Gregor if (isa<UndefValue>(II->getArgOperand(0)) || 428a88084b78fd4ca5d3d858c14b02414f8cc399f02Douglas Gregor isa<UndefValue>(II->getArgOperand(1))) 429a88084b78fd4ca5d3d858c14b02414f8cc399f02Douglas Gregor return ReplaceInstUsesWith(CI, UndefValue::get(II->getType())); 430a88084b78fd4ca5d3d858c14b02414f8cc399f02Douglas Gregor 431a88084b78fd4ca5d3d858c14b02414f8cc399f02Douglas Gregor if (ConstantInt *RHS = dyn_cast<ConstantInt>(II->getArgOperand(1))) { 432a88084b78fd4ca5d3d858c14b02414f8cc399f02Douglas Gregor // X - 0 -> {X, false} 433a88084b78fd4ca5d3d858c14b02414f8cc399f02Douglas Gregor if (RHS->isZero()) { 4345352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor Constant *V[] = { 4355352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor UndefValue::get(II->getArgOperand(0)->getType()), 4360a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor ConstantInt::getFalse(II->getContext()) 4370a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor }; 4380a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor Constant *Struct = 4390a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor ConstantStruct::get(cast<StructType>(II->getType()), V); 4400a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor return InsertValueInst::Create(Struct, II->getArgOperand(0), 0); 4410a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor } 4420a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor } 4430a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor break; 4440a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor case Intrinsic::umul_with_overflow: { 4450a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor Value *LHS = II->getArgOperand(0), *RHS = II->getArgOperand(1); 4460a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor unsigned BitWidth = cast<IntegerType>(LHS->getType())->getBitWidth(); 4470a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor 4480a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor APInt LHSKnownZero(BitWidth, 0); 4490a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor APInt LHSKnownOne(BitWidth, 0); 4500a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor ComputeMaskedBits(LHS, LHSKnownZero, LHSKnownOne); 4510a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor APInt RHSKnownZero(BitWidth, 0); 4520a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor APInt RHSKnownOne(BitWidth, 0); 4530a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor ComputeMaskedBits(RHS, RHSKnownZero, RHSKnownOne); 4540a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor 4550a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor // Get the largest possible values for each operand. 4560a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor APInt LHSMax = ~LHSKnownZero; 4570a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor APInt RHSMax = ~RHSKnownZero; 4580a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor 4590a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor // If multiplying the maximum values does not overflow then we can turn 4600a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor // this into a plain NUW mul. 4610a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor bool Overflow; 4620a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor LHSMax.umul_ov(RHSMax, Overflow); 4630a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor if (!Overflow) { 4640a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor Value *Mul = Builder->CreateNUWMul(LHS, RHS, "umul_with_overflow"); 4650a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor Constant *V[] = { 4660a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor UndefValue::get(LHS->getType()), 4670a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor Builder->getFalse() 4680a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor }; 4690a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor Constant *Struct = ConstantStruct::get(cast<StructType>(II->getType()),V); 470896b70ffc348f6e2c680b5fb5841984d5785b7b5Ted Kremenek return InsertValueInst::Create(Struct, Mul, 0); 4710a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor } 4720a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor } // FALL THROUGH 4730a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor case Intrinsic::smul_with_overflow: 4740a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor // Canonicalize constants into the RHS. 4750a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor if (isa<Constant>(II->getArgOperand(0)) && 4760a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor !isa<Constant>(II->getArgOperand(1))) { 477274f1906f12ebf8fcc179701deeda6d3271120c1Douglas Gregor Value *LHS = II->getArgOperand(0); 4780a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor II->setArgOperand(0, II->getArgOperand(1)); 479274f1906f12ebf8fcc179701deeda6d3271120c1Douglas Gregor II->setArgOperand(1, LHS); 480896b70ffc348f6e2c680b5fb5841984d5785b7b5Ted Kremenek return II; 481896b70ffc348f6e2c680b5fb5841984d5785b7b5Ted Kremenek } 4820a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor 4830a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor // X * undef -> undef 4840a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor if (isa<UndefValue>(II->getArgOperand(1))) 4850a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor return ReplaceInstUsesWith(CI, UndefValue::get(II->getType())); 486896b70ffc348f6e2c680b5fb5841984d5785b7b5Ted Kremenek 4870a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor if (ConstantInt *RHSI = dyn_cast<ConstantInt>(II->getArgOperand(1))) { 488274f1906f12ebf8fcc179701deeda6d3271120c1Douglas Gregor // X*0 -> {0, false} 489274f1906f12ebf8fcc179701deeda6d3271120c1Douglas Gregor if (RHSI->isZero()) 4900a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor return ReplaceInstUsesWith(CI, Constant::getNullValue(II->getType())); 491274f1906f12ebf8fcc179701deeda6d3271120c1Douglas Gregor 492274f1906f12ebf8fcc179701deeda6d3271120c1Douglas Gregor // X * 1 -> {X, false} 4930a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor if (RHSI->equalsInt(1)) { 4940a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor Constant *V[] = { 4950a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor UndefValue::get(II->getArgOperand(0)->getType()), 4960a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor ConstantInt::getFalse(II->getContext()) 4970a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor }; 4980a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor Constant *Struct = 4990a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor ConstantStruct::get(cast<StructType>(II->getType()), V); 5000a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor return InsertValueInst::Create(Struct, II->getArgOperand(0), 0); 5010a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor } 5020a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor } 5030a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor break; 5040a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor case Intrinsic::ppc_altivec_lvx: 5050a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor case Intrinsic::ppc_altivec_lvxl: 5060a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor // Turn PPC lvx -> load if the pointer is known aligned. 5070a812cf707da15dadd19fdeb0178b9707f4e01a6Douglas Gregor if (getOrEnforceKnownAlignment(II->getArgOperand(0), 16, TD) >= 16) { 5085352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor Value *Ptr = Builder->CreateBitCast(II->getArgOperand(0), 5095352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor PointerType::getUnqual(II->getType())); 510896b70ffc348f6e2c680b5fb5841984d5785b7b5Ted Kremenek return new LoadInst(Ptr); 5115352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor } 5125352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor break; 5135352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor case Intrinsic::ppc_altivec_stvx: 5145352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor case Intrinsic::ppc_altivec_stvxl: 5155352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor // Turn stvx -> store if the pointer is known aligned. 5165352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor if (getOrEnforceKnownAlignment(II->getArgOperand(1), 16, TD) >= 16) { 5175352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor Type *OpPtrTy = 5185352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor PointerType::getUnqual(II->getArgOperand(0)->getType()); 5195352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor Value *Ptr = Builder->CreateBitCast(II->getArgOperand(1), OpPtrTy); 5205352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor return new StoreInst(II->getArgOperand(0), Ptr); 5215352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor } 5225352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor break; 5235352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor case Intrinsic::x86_sse_storeu_ps: 5245352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor case Intrinsic::x86_sse2_storeu_pd: 525a3890baf1256ff26081306c7fef70202f8223f41Douglas Gregor case Intrinsic::x86_sse2_storeu_dq: 526a3890baf1256ff26081306c7fef70202f8223f41Douglas Gregor // Turn X86 storeu -> store if the pointer is known aligned. 527a3890baf1256ff26081306c7fef70202f8223f41Douglas Gregor if (getOrEnforceKnownAlignment(II->getArgOperand(0), 16, TD) >= 16) { 528a3890baf1256ff26081306c7fef70202f8223f41Douglas Gregor Type *OpPtrTy = 529a3890baf1256ff26081306c7fef70202f8223f41Douglas Gregor PointerType::getUnqual(II->getArgOperand(1)->getType()); 530a3890baf1256ff26081306c7fef70202f8223f41Douglas Gregor Value *Ptr = Builder->CreateBitCast(II->getArgOperand(0), OpPtrTy); 531896b70ffc348f6e2c680b5fb5841984d5785b7b5Ted Kremenek return new StoreInst(II->getArgOperand(1), Ptr); 5325352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor } 533a3890baf1256ff26081306c7fef70202f8223f41Douglas Gregor break; 5345352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor 535a3890baf1256ff26081306c7fef70202f8223f41Douglas Gregor case Intrinsic::x86_sse_cvtss2si: 5365352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor case Intrinsic::x86_sse_cvtss2si64: 537896b70ffc348f6e2c680b5fb5841984d5785b7b5Ted Kremenek case Intrinsic::x86_sse_cvttss2si: 5385352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor case Intrinsic::x86_sse_cvttss2si64: 539a3890baf1256ff26081306c7fef70202f8223f41Douglas Gregor case Intrinsic::x86_sse2_cvtsd2si: 5405352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor case Intrinsic::x86_sse2_cvtsd2si64: 541896b70ffc348f6e2c680b5fb5841984d5785b7b5Ted Kremenek case Intrinsic::x86_sse2_cvttsd2si: 5425352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor case Intrinsic::x86_sse2_cvttsd2si64: { 543a3890baf1256ff26081306c7fef70202f8223f41Douglas Gregor // These intrinsics only demand the 0th element of their input vectors. If 5445352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor // we can simplify the input based on that, do so now. 545896b70ffc348f6e2c680b5fb5841984d5785b7b5Ted Kremenek unsigned VWidth = 546a3890baf1256ff26081306c7fef70202f8223f41Douglas Gregor cast<VectorType>(II->getArgOperand(0)->getType())->getNumElements(); 5475352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor APInt DemandedElts(VWidth, 1); 5485352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor APInt UndefElts(VWidth, 0); 5495352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor if (Value *V = SimplifyDemandedVectorElts(II->getArgOperand(0), 5505352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor DemandedElts, UndefElts)) { 5515352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor II->setArgOperand(0, V); 5525352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor return II; 5535352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor } 5545352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor break; 555473d7019bb54f8a2f0140dca9e9644a935cc6b20Douglas Gregor } 5565352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor 557473d7019bb54f8a2f0140dca9e9644a935cc6b20Douglas Gregor 558473d7019bb54f8a2f0140dca9e9644a935cc6b20Douglas Gregor case Intrinsic::x86_sse41_pmovsxbw: 559473d7019bb54f8a2f0140dca9e9644a935cc6b20Douglas Gregor case Intrinsic::x86_sse41_pmovsxwd: 560473d7019bb54f8a2f0140dca9e9644a935cc6b20Douglas Gregor case Intrinsic::x86_sse41_pmovsxdq: 561473d7019bb54f8a2f0140dca9e9644a935cc6b20Douglas Gregor case Intrinsic::x86_sse41_pmovzxbw: 562473d7019bb54f8a2f0140dca9e9644a935cc6b20Douglas Gregor case Intrinsic::x86_sse41_pmovzxwd: 563473d7019bb54f8a2f0140dca9e9644a935cc6b20Douglas Gregor case Intrinsic::x86_sse41_pmovzxdq: { 564473d7019bb54f8a2f0140dca9e9644a935cc6b20Douglas Gregor // pmov{s|z}x ignores the upper half of their input vectors. 565473d7019bb54f8a2f0140dca9e9644a935cc6b20Douglas Gregor unsigned VWidth = 5665352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor cast<VectorType>(II->getArgOperand(0)->getType())->getNumElements(); 567473d7019bb54f8a2f0140dca9e9644a935cc6b20Douglas Gregor unsigned LowHalfElts = VWidth / 2; 5685352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor APInt InputDemandedElts(APInt::getBitsSet(VWidth, 0, LowHalfElts)); 569473d7019bb54f8a2f0140dca9e9644a935cc6b20Douglas Gregor APInt UndefElts(VWidth, 0); 5705352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor if (Value *TmpV = SimplifyDemandedVectorElts(II->getArgOperand(0), 571473d7019bb54f8a2f0140dca9e9644a935cc6b20Douglas Gregor InputDemandedElts, 572473d7019bb54f8a2f0140dca9e9644a935cc6b20Douglas Gregor UndefElts)) { 573473d7019bb54f8a2f0140dca9e9644a935cc6b20Douglas Gregor II->setArgOperand(0, TmpV); 574473d7019bb54f8a2f0140dca9e9644a935cc6b20Douglas Gregor return II; 5755352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor } 576473d7019bb54f8a2f0140dca9e9644a935cc6b20Douglas Gregor break; 577473d7019bb54f8a2f0140dca9e9644a935cc6b20Douglas Gregor } 5785352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor 579896b70ffc348f6e2c680b5fb5841984d5785b7b5Ted Kremenek case Intrinsic::ppc_altivec_vperm: 580473d7019bb54f8a2f0140dca9e9644a935cc6b20Douglas Gregor // Turn vperm(V1,V2,mask) -> shuffle(V1,V2,mask) if mask is a constant. 581473d7019bb54f8a2f0140dca9e9644a935cc6b20Douglas Gregor if (Constant *Mask = dyn_cast<Constant>(II->getArgOperand(2))) { 5825352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor assert(Mask->getType()->getVectorNumElements() == 16 && 5835352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor "Bad type for intrinsic!"); 5845352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor 5855352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor // Check that all of the elements are integer constants or undefs. 5865352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor bool AllEltsOk = true; 5875352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor for (unsigned i = 0; i != 16; ++i) { 5885352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor Constant *Elt = Mask->getAggregateElement(i); 5895352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor if (Elt == 0 || 5905352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor !(isa<ConstantInt>(Elt) || isa<UndefValue>(Elt))) { 5915352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor AllEltsOk = false; 5925352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor break; 5935352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor } 5945352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor } 5955352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor 596896b70ffc348f6e2c680b5fb5841984d5785b7b5Ted Kremenek if (AllEltsOk) { 5975352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor // Cast the input vectors to byte vectors. 5985352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor Value *Op0 = Builder->CreateBitCast(II->getArgOperand(0), 5995352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor Mask->getType()); 6005352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor Value *Op1 = Builder->CreateBitCast(II->getArgOperand(1), 6015352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor Mask->getType()); 6025352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor Value *Result = UndefValue::get(Op0->getType()); 6035352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor 6045352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor // Only extract each element once. 6055352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor Value *ExtractedElts[32]; 6065352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor memset(ExtractedElts, 0, sizeof(ExtractedElts)); 6075352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor 6085352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor for (unsigned i = 0; i != 16; ++i) { 6095352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor if (isa<UndefValue>(Mask->getAggregateElement(i))) 6105352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor continue; 6115352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor unsigned Idx = 6125352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor cast<ConstantInt>(Mask->getAggregateElement(i))->getZExtValue(); 6135352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor Idx &= 31; // Match the hardware behavior. 6145352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor 6155352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor if (ExtractedElts[Idx] == 0) { 6165352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor ExtractedElts[Idx] = 6175352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor Builder->CreateExtractElement(Idx < 16 ? Op0 : Op1, 6185352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor Builder->getInt32(Idx&15)); 6195352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor } 6205352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor 6215352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor // Insert this value into the result vector. 6225352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor Result = Builder->CreateInsertElement(Result, ExtractedElts[Idx], 6235352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor Builder->getInt32(i)); 6245352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor } 6255352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor return CastInst::Create(Instruction::BitCast, Result, CI.getType()); 6265352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor } 6275352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor } 628c6f530defd937faa1c00998e60deea6368526961Ted Kremenek break; 629c6f530defd937faa1c00998e60deea6368526961Ted Kremenek 630c6f530defd937faa1c00998e60deea6368526961Ted Kremenek case Intrinsic::arm_neon_vld1: 6315352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor case Intrinsic::arm_neon_vld2: 6325352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor case Intrinsic::arm_neon_vld3: 6335352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor case Intrinsic::arm_neon_vld4: 6345352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor case Intrinsic::arm_neon_vld2lane: 6355352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor case Intrinsic::arm_neon_vld3lane: 6365352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor case Intrinsic::arm_neon_vld4lane: 6375352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor case Intrinsic::arm_neon_vst1: 6385352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor case Intrinsic::arm_neon_vst2: 6395352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor case Intrinsic::arm_neon_vst3: 6405352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor case Intrinsic::arm_neon_vst4: 6415352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor case Intrinsic::arm_neon_vst2lane: 6425352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor case Intrinsic::arm_neon_vst3lane: 6432ef6944d529c94824f5bf96f65665f5bee30f5a2Douglas Gregor case Intrinsic::arm_neon_vst4lane: { 6445352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor unsigned MemAlign = getKnownAlignment(II->getArgOperand(0), TD); 645a88084b78fd4ca5d3d858c14b02414f8cc399f02Douglas Gregor unsigned AlignArg = II->getNumArgOperands() - 1; 646896b70ffc348f6e2c680b5fb5841984d5785b7b5Ted Kremenek ConstantInt *IntrAlign = dyn_cast<ConstantInt>(II->getArgOperand(AlignArg)); 6475352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor if (IntrAlign && IntrAlign->getZExtValue() < MemAlign) { 6485352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor II->setArgOperand(AlignArg, 6495352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor ConstantInt::get(Type::getInt32Ty(II->getContext()), 650896b70ffc348f6e2c680b5fb5841984d5785b7b5Ted Kremenek MemAlign, false)); 651a88084b78fd4ca5d3d858c14b02414f8cc399f02Douglas Gregor return II; 6525352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor } 65344c181aec37789f25f6c15543c164416f72e562aDouglas Gregor break; 65444c181aec37789f25f6c15543c164416f72e562aDouglas Gregor } 65544c181aec37789f25f6c15543c164416f72e562aDouglas Gregor 65644c181aec37789f25f6c15543c164416f72e562aDouglas Gregor case Intrinsic::arm_neon_vmulls: 65744c181aec37789f25f6c15543c164416f72e562aDouglas Gregor case Intrinsic::arm_neon_vmullu: { 65844c181aec37789f25f6c15543c164416f72e562aDouglas Gregor Value *Arg0 = II->getArgOperand(0); 65944c181aec37789f25f6c15543c164416f72e562aDouglas Gregor Value *Arg1 = II->getArgOperand(1); 6605a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor 6615a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor // Handle mul by zero first: 6625a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor if (isa<ConstantAggregateZero>(Arg0) || isa<ConstantAggregateZero>(Arg1)) { 6635a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor return ReplaceInstUsesWith(CI, ConstantAggregateZero::get(II->getType())); 6645a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor } 6655a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor 6665a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor // Check for constant LHS & RHS - in this case we just simplify. 6675a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor bool Zext = (II->getIntrinsicID() == Intrinsic::arm_neon_vmullu); 6685a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor VectorType *NewVT = cast<VectorType>(II->getType()); 6695a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor unsigned NewWidth = NewVT->getElementType()->getIntegerBitWidth(); 6705a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor if (ConstantDataVector *CV0 = dyn_cast<ConstantDataVector>(Arg0)) { 6715a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor if (ConstantDataVector *CV1 = dyn_cast<ConstantDataVector>(Arg1)) { 6725a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor VectorType* VT = cast<VectorType>(CV0->getType()); 6735a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor SmallVector<Constant*, 4> NewElems; 6745a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor for (unsigned i = 0; i < VT->getNumElements(); ++i) { 6755a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor APInt CV0E = 6765a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor (cast<ConstantInt>(CV0->getAggregateElement(i)))->getValue(); 67744c181aec37789f25f6c15543c164416f72e562aDouglas Gregor CV0E = Zext ? CV0E.zext(NewWidth) : CV0E.sext(NewWidth); 67844c181aec37789f25f6c15543c164416f72e562aDouglas Gregor APInt CV1E = 67944c181aec37789f25f6c15543c164416f72e562aDouglas Gregor (cast<ConstantInt>(CV1->getAggregateElement(i)))->getValue(); 680b1c031be513705d924038f497279b9b599868ba1Douglas Gregor CV1E = Zext ? CV1E.zext(NewWidth) : CV1E.sext(NewWidth); 68144c181aec37789f25f6c15543c164416f72e562aDouglas Gregor NewElems.push_back( 682b1c031be513705d924038f497279b9b599868ba1Douglas Gregor ConstantInt::get(NewVT->getElementType(), CV0E * CV1E)); 683b1c031be513705d924038f497279b9b599868ba1Douglas Gregor } 684b1c031be513705d924038f497279b9b599868ba1Douglas Gregor return ReplaceInstUsesWith(CI, ConstantVector::get(NewElems)); 685b1c031be513705d924038f497279b9b599868ba1Douglas Gregor } 686b1c031be513705d924038f497279b9b599868ba1Douglas Gregor 687b1c031be513705d924038f497279b9b599868ba1Douglas Gregor // Couldn't simplify - cannonicalize constant to the RHS. 688b1c031be513705d924038f497279b9b599868ba1Douglas Gregor std::swap(Arg0, Arg1); 68944c181aec37789f25f6c15543c164416f72e562aDouglas Gregor } 690b1c031be513705d924038f497279b9b599868ba1Douglas Gregor 69144c181aec37789f25f6c15543c164416f72e562aDouglas Gregor // Handle mul by one: 69244c181aec37789f25f6c15543c164416f72e562aDouglas Gregor if (ConstantDataVector *CV1 = dyn_cast<ConstantDataVector>(Arg1)) { 69344c181aec37789f25f6c15543c164416f72e562aDouglas Gregor if (ConstantInt *Splat = 69444c181aec37789f25f6c15543c164416f72e562aDouglas Gregor dyn_cast_or_null<ConstantInt>(CV1->getSplatValue())) { 69544c181aec37789f25f6c15543c164416f72e562aDouglas Gregor if (Splat->isOne()) { 69644c181aec37789f25f6c15543c164416f72e562aDouglas Gregor if (Zext) 69744c181aec37789f25f6c15543c164416f72e562aDouglas Gregor return CastInst::CreateZExtOrBitCast(Arg0, II->getType()); 69844c181aec37789f25f6c15543c164416f72e562aDouglas Gregor // else 69944c181aec37789f25f6c15543c164416f72e562aDouglas Gregor return CastInst::CreateSExtOrBitCast(Arg0, II->getType()); 70044c181aec37789f25f6c15543c164416f72e562aDouglas Gregor } 70144c181aec37789f25f6c15543c164416f72e562aDouglas Gregor } 70244c181aec37789f25f6c15543c164416f72e562aDouglas Gregor } 70344c181aec37789f25f6c15543c164416f72e562aDouglas Gregor 70444c181aec37789f25f6c15543c164416f72e562aDouglas Gregor break; 70544c181aec37789f25f6c15543c164416f72e562aDouglas Gregor } 706e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor 707e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor case Intrinsic::stackrestore: { 708e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor // If the save is right next to the restore, remove the restore. This can 709e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor // happen when variable allocas are DCE'd. 710e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor if (IntrinsicInst *SS = dyn_cast<IntrinsicInst>(II->getArgOperand(0))) { 711e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor if (SS->getIntrinsicID() == Intrinsic::stacksave) { 712e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor BasicBlock::iterator BI = SS; 713e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor if (&*++BI == II) 714e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor return EraseInstFromFunction(CI); 715e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor } 71699ba202f659e1885fa5ee114f97c97cf6a857491Douglas Gregor } 71799ba202f659e1885fa5ee114f97c97cf6a857491Douglas Gregor 71899ba202f659e1885fa5ee114f97c97cf6a857491Douglas Gregor // Scan down this block to see if there is another stack restore in the 71999ba202f659e1885fa5ee114f97c97cf6a857491Douglas Gregor // same block without an intervening call/alloca. 72099ba202f659e1885fa5ee114f97c97cf6a857491Douglas Gregor BasicBlock::iterator BI = II; 72199ba202f659e1885fa5ee114f97c97cf6a857491Douglas Gregor TerminatorInst *TI = II->getParent()->getTerminator(); 72299ba202f659e1885fa5ee114f97c97cf6a857491Douglas Gregor bool CannotRemove = false; 72399ba202f659e1885fa5ee114f97c97cf6a857491Douglas Gregor for (++BI; &*BI != TI; ++BI) { 72499ba202f659e1885fa5ee114f97c97cf6a857491Douglas Gregor if (isa<AllocaInst>(BI)) { 72599ba202f659e1885fa5ee114f97c97cf6a857491Douglas Gregor CannotRemove = true; 72699ba202f659e1885fa5ee114f97c97cf6a857491Douglas Gregor break; 72799ba202f659e1885fa5ee114f97c97cf6a857491Douglas Gregor } 72899ba202f659e1885fa5ee114f97c97cf6a857491Douglas Gregor if (CallInst *BCI = dyn_cast<CallInst>(BI)) { 72999ba202f659e1885fa5ee114f97c97cf6a857491Douglas Gregor if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(BCI)) { 73099ba202f659e1885fa5ee114f97c97cf6a857491Douglas Gregor // If there is a stackrestore below this one, remove this one. 73199ba202f659e1885fa5ee114f97c97cf6a857491Douglas Gregor if (II->getIntrinsicID() == Intrinsic::stackrestore) 7325a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor return EraseInstFromFunction(CI); 7335a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor // Otherwise, ignore the intrinsic. 7345a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor } else { 735b1c031be513705d924038f497279b9b599868ba1Douglas Gregor // If we found a non-intrinsic call, we can't remove the stack 736b1c031be513705d924038f497279b9b599868ba1Douglas Gregor // restore. 737b1c031be513705d924038f497279b9b599868ba1Douglas Gregor CannotRemove = true; 738b1c031be513705d924038f497279b9b599868ba1Douglas Gregor break; 739b1c031be513705d924038f497279b9b599868ba1Douglas Gregor } 740b1c031be513705d924038f497279b9b599868ba1Douglas Gregor } 741b1c031be513705d924038f497279b9b599868ba1Douglas Gregor } 742b1c031be513705d924038f497279b9b599868ba1Douglas Gregor 743b1c031be513705d924038f497279b9b599868ba1Douglas Gregor // If the stack restore is in a return, resume, or unwind block and if there 744b1c031be513705d924038f497279b9b599868ba1Douglas Gregor // are no allocas or calls between the restore and the return, nuke the 745b1c031be513705d924038f497279b9b599868ba1Douglas Gregor // restore. 746e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor if (!CannotRemove && (isa<ReturnInst>(TI) || isa<ResumeInst>(TI))) 747b1c031be513705d924038f497279b9b599868ba1Douglas Gregor return EraseInstFromFunction(CI); 748b1c031be513705d924038f497279b9b599868ba1Douglas Gregor break; 7495a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor } 7505a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor } 7515a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor 7525a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor return visitCallSite(II); 7535a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor} 7545a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor 7555a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor// InvokeInst simplification 7565a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor// 7575a43021ac491bf091494167127772a20d9a9bb48Douglas GregorInstruction *InstCombiner::visitInvokeInst(InvokeInst &II) { 7585a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor return visitCallSite(&II); 7595a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor} 7605a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor 7615a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor/// isSafeToEliminateVarargsCast - If this cast does not affect the value 7625a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor/// passed through the varargs area, we can eliminate the use of the cast. 7635a43021ac491bf091494167127772a20d9a9bb48Douglas Gregorstatic bool isSafeToEliminateVarargsCast(const CallSite CS, 7645a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor const CastInst * const CI, 7655a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor const DataLayout * const TD, 7665a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor const int ix) { 7675a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor if (!CI->isLosslessCast()) 7685a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor return false; 7695a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor 7705a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor // The size of ByVal arguments is derived from the type, so we 7715a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor // can't change to a type with a different size. If the size were 7725a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor // passed explicitly we could avoid this check. 7735a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor if (!CS.isByValArgument(ix)) 7741abc6bca3d7fb0e7b1e40fbcad6cfb5e10594548Douglas Gregor return true; 7755a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor 7765a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor Type* SrcTy = 7775a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor cast<PointerType>(CI->getOperand(0)->getType())->getElementType(); 7785a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor Type* DstTy = cast<PointerType>(CI->getType())->getElementType(); 7795a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor if (!SrcTy->isSized() || !DstTy->isSized()) 7805a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor return false; 7815a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor if (!TD || TD->getTypeAllocSize(SrcTy) != TD->getTypeAllocSize(DstTy)) 7825a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor return false; 7835a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor return true; 7845a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor} 7855a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor 7865a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor// Try to fold some different type of calls here. 7875a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor// Currently we're only working with the checking functions, memcpy_chk, 7885a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor// mempcpy_chk, memmove_chk, memset_chk, strcpy_chk, stpcpy_chk, strncpy_chk, 7895a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor// strcat_chk and strncat_chk. 7905a43021ac491bf091494167127772a20d9a9bb48Douglas GregorInstruction *InstCombiner::tryOptimizeCall(CallInst *CI, const DataLayout *TD) { 7915a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor if (CI->getCalledFunction() == 0) return 0; 7922ef6944d529c94824f5bf96f65665f5bee30f5a2Douglas Gregor 7935a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor if (Value *With = Simplifier->optimizeCall(CI)) { 7945a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor ++NumSimplified; 7955a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor return CI->use_empty() ? CI : ReplaceInstUsesWith(*CI, With); 7965a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor } 7975a43021ac491bf091494167127772a20d9a9bb48Douglas Gregor 7985352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor return 0; 7991999844e7a18786e61e619e1dc6c789827541863Douglas Gregor} 8001999844e7a18786e61e619e1dc6c789827541863Douglas Gregor 8011999844e7a18786e61e619e1dc6c789827541863Douglas Gregorstatic IntrinsicInst *FindInitTrampolineFromAlloca(Value *TrampMem) { 8021999844e7a18786e61e619e1dc6c789827541863Douglas Gregor // Strip off at most one level of pointer casts, looking for an alloca. This 8031999844e7a18786e61e619e1dc6c789827541863Douglas Gregor // is good enough in practice and simpler than handling any number of casts. 8041999844e7a18786e61e619e1dc6c789827541863Douglas Gregor Value *Underlying = TrampMem->stripPointerCasts(); 8051999844e7a18786e61e619e1dc6c789827541863Douglas Gregor if (Underlying != TrampMem && 8061999844e7a18786e61e619e1dc6c789827541863Douglas Gregor (!Underlying->hasOneUse() || *Underlying->use_begin() != TrampMem)) 8071999844e7a18786e61e619e1dc6c789827541863Douglas Gregor return 0; 8081999844e7a18786e61e619e1dc6c789827541863Douglas Gregor if (!isa<AllocaInst>(Underlying)) 8091999844e7a18786e61e619e1dc6c789827541863Douglas Gregor return 0; 8101999844e7a18786e61e619e1dc6c789827541863Douglas Gregor 8111999844e7a18786e61e619e1dc6c789827541863Douglas Gregor IntrinsicInst *InitTrampoline = 0; 8121999844e7a18786e61e619e1dc6c789827541863Douglas Gregor for (Value::use_iterator I = TrampMem->use_begin(), E = TrampMem->use_end(); 8131999844e7a18786e61e619e1dc6c789827541863Douglas Gregor I != E; I++) { 8141999844e7a18786e61e619e1dc6c789827541863Douglas Gregor IntrinsicInst *II = dyn_cast<IntrinsicInst>(*I); 8151999844e7a18786e61e619e1dc6c789827541863Douglas Gregor if (!II) 8161999844e7a18786e61e619e1dc6c789827541863Douglas Gregor return 0; 8171999844e7a18786e61e619e1dc6c789827541863Douglas Gregor if (II->getIntrinsicID() == Intrinsic::init_trampoline) { 8181999844e7a18786e61e619e1dc6c789827541863Douglas Gregor if (InitTrampoline) 8191999844e7a18786e61e619e1dc6c789827541863Douglas Gregor // More than one init_trampoline writes to this value. Give up. 8201999844e7a18786e61e619e1dc6c789827541863Douglas Gregor return 0; 8211999844e7a18786e61e619e1dc6c789827541863Douglas Gregor InitTrampoline = II; 8221999844e7a18786e61e619e1dc6c789827541863Douglas Gregor continue; 8231999844e7a18786e61e619e1dc6c789827541863Douglas Gregor } 8247ae2faafd30524ef5f863bb3b8701977888839bbDouglas Gregor if (II->getIntrinsicID() == Intrinsic::adjust_trampoline) 8257ae2faafd30524ef5f863bb3b8701977888839bbDouglas Gregor // Allow any number of calls to adjust.trampoline. 8267ae2faafd30524ef5f863bb3b8701977888839bbDouglas Gregor continue; 8277ae2faafd30524ef5f863bb3b8701977888839bbDouglas Gregor return 0; 8287ae2faafd30524ef5f863bb3b8701977888839bbDouglas Gregor } 8297ae2faafd30524ef5f863bb3b8701977888839bbDouglas Gregor 8307ae2faafd30524ef5f863bb3b8701977888839bbDouglas Gregor // No call to init.trampoline found. 8317ae2faafd30524ef5f863bb3b8701977888839bbDouglas Gregor if (!InitTrampoline) 8327ae2faafd30524ef5f863bb3b8701977888839bbDouglas Gregor return 0; 8337ae2faafd30524ef5f863bb3b8701977888839bbDouglas Gregor 8347ae2faafd30524ef5f863bb3b8701977888839bbDouglas Gregor // Check that the alloca is being used in the expected way. 8351999844e7a18786e61e619e1dc6c789827541863Douglas Gregor if (InitTrampoline->getOperand(0) != TrampMem) 8367ae2faafd30524ef5f863bb3b8701977888839bbDouglas Gregor return 0; 8377ae2faafd30524ef5f863bb3b8701977888839bbDouglas Gregor 8381999844e7a18786e61e619e1dc6c789827541863Douglas Gregor return InitTrampoline; 8391999844e7a18786e61e619e1dc6c789827541863Douglas Gregor} 8401999844e7a18786e61e619e1dc6c789827541863Douglas Gregor 8411999844e7a18786e61e619e1dc6c789827541863Douglas Gregorstatic IntrinsicInst *FindInitTrampolineFromBB(IntrinsicInst *AdjustTramp, 8427ae2faafd30524ef5f863bb3b8701977888839bbDouglas Gregor Value *TrampMem) { 8437ae2faafd30524ef5f863bb3b8701977888839bbDouglas Gregor // Visit all the previous instructions in the basic block, and try to find a 8447ae2faafd30524ef5f863bb3b8701977888839bbDouglas Gregor // init.trampoline which has a direct path to the adjust.trampoline. 8457ae2faafd30524ef5f863bb3b8701977888839bbDouglas Gregor for (BasicBlock::iterator I = AdjustTramp, 8461999844e7a18786e61e619e1dc6c789827541863Douglas Gregor E = AdjustTramp->getParent()->begin(); I != E; ) { 8471999844e7a18786e61e619e1dc6c789827541863Douglas Gregor Instruction *Inst = --I; 8487ae2faafd30524ef5f863bb3b8701977888839bbDouglas Gregor if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(I)) 8497ae2faafd30524ef5f863bb3b8701977888839bbDouglas Gregor if (II->getIntrinsicID() == Intrinsic::init_trampoline && 8505352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor II->getOperand(0) == TrampMem) 8515352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor return II; 8525352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor if (Inst->mayWriteToMemory()) 853896b70ffc348f6e2c680b5fb5841984d5785b7b5Ted Kremenek return 0; 8545352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor } 855e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor return 0; 856e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor} 857e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor 858e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor// Given a call to llvm.adjust.trampoline, find and return the corresponding 859e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor// call to llvm.init.trampoline if the call to the trampoline can be optimized 860e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor// to a direct call to a function. Otherwise return NULL. 861e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor// 862e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregorstatic IntrinsicInst *FindInitTrampoline(Value *Callee) { 863e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor Callee = Callee->stripPointerCasts(); 864e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor IntrinsicInst *AdjustTramp = dyn_cast<IntrinsicInst>(Callee); 865e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor if (!AdjustTramp || 866e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor AdjustTramp->getIntrinsicID() != Intrinsic::adjust_trampoline) 867e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor return 0; 868e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor 869e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor Value *TrampMem = AdjustTramp->getOperand(0); 870e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor 871e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor if (IntrinsicInst *IT = FindInitTrampolineFromAlloca(TrampMem)) 872e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor return IT; 873e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor if (IntrinsicInst *IT = FindInitTrampolineFromBB(AdjustTramp, TrampMem)) 874e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor return IT; 875e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor return 0; 876e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor} 877e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor 878e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor// visitCallSite - Improvements for call and invoke instructions. 879e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor// 880e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas GregorInstruction *InstCombiner::visitCallSite(CallSite CS) { 881abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor if (isAllocLikeFn(CS.getInstruction(), TLI)) 882abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor return visitAllocSite(*CS.getInstruction()); 883abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor 884abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor bool Changed = false; 885abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor 886abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor // If the callee is a pointer to a function, attempt to move any casts to the 887abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor // arguments of the call/invoke. 888abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor Value *Callee = CS.getCalledValue(); 889abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor if (!isa<Function>(Callee) && transformConstExprCastCall(CS)) 890abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor return 0; 891abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor 892abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor if (Function *CalleeF = dyn_cast<Function>(Callee)) 893abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor // If the call and callee calling conventions don't match, this call must 894abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor // be unreachable, as the call is undefined. 895abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor if (CalleeF->getCallingConv() != CS.getCallingConv() && 896abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor // Only do this for calls to a function with a body. A prototype may 897abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor // not actually end up matching the implementation's calling conv for a 898abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor // variety of reasons (e.g. it may be written in assembly). 899abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor !CalleeF->isDeclaration()) { 900abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor Instruction *OldCall = CS.getInstruction(); 901abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor new StoreInst(ConstantInt::getTrue(Callee->getContext()), 902abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor UndefValue::get(Type::getInt1PtrTy(Callee->getContext())), 903abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor OldCall); 904abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor // If OldCall does not return void then replaceAllUsesWith undef. 905abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor // This allows ValueHandlers and custom metadata to adjust itself. 906abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor if (!OldCall->getType()->isVoidTy()) 907abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor ReplaceInstUsesWith(*OldCall, UndefValue::get(OldCall->getType())); 908abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor if (isa<CallInst>(OldCall)) 909e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor return EraseInstFromFunction(*OldCall); 910e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor 911e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor // We cannot remove an invoke, because it would change the CFG, just 912e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor // change the callee to a null pointer. 913abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor cast<InvokeInst>(OldCall)->setCalledFunction( 914abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor Constant::getNullValue(CalleeF->getType())); 915abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor return 0; 916abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor } 917abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor 918abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor if (isa<ConstantPointerNull>(Callee) || isa<UndefValue>(Callee)) { 919abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor // If CS does not return void then replaceAllUsesWith undef. 920e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor // This allows ValueHandlers and custom metadata to adjust itself. 921e1e13bf568a7e37c95eda6fcfa626659a06e67b1Douglas Gregor if (!CS.getInstruction()->getType()->isVoidTy()) 922abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor ReplaceInstUsesWith(*CS.getInstruction(), 923abc563f554951259bbe0315055cad92ee14d87e4Douglas Gregor UndefValue::get(CS.getInstruction()->getType())); 9245352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor 9255352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor if (isa<InvokeInst>(CS.getInstruction())) { 926896b70ffc348f6e2c680b5fb5841984d5785b7b5Ted Kremenek // Can't remove an invoke because we cannot change the CFG. 9275352ac06d8f6194825bb2a99ffa009b61bafb503Douglas Gregor return 0; 928c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor } 929c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 930c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // This instruction is not reachable, just remove it. We insert a store to 931c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // undef so that we know that this code is not reachable, despite the fact 9321efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar // that we can't modify the CFG here. 933c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor new StoreInst(ConstantInt::getTrue(Callee->getContext()), 9341efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar UndefValue::get(Type::getInt1PtrTy(Callee->getContext())), 935c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor CS.getInstruction()); 936c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 937c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor return EraseInstFromFunction(*CS.getInstruction()); 938c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor } 939c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 940c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor if (IntrinsicInst *II = FindInitTrampoline(Callee)) 941c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor return transformCallThroughTrampoline(CS, II); 942c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 9431efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar PointerType *PTy = cast<PointerType>(Callee->getType()); 944c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor FunctionType *FTy = cast<FunctionType>(PTy->getElementType()); 945c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor if (FTy->isVarArg()) { 946c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor int ix = FTy->getNumParams(); 947c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // See if we can optimize any arguments passed through the varargs area of 948c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // the call. 949c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor for (CallSite::arg_iterator I = CS.arg_begin()+FTy->getNumParams(), 9501efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar E = CS.arg_end(); I != E; ++I, ++ix) { 951c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor CastInst *CI = dyn_cast<CastInst>(*I); 952c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor if (CI && isSafeToEliminateVarargsCast(CS, CI, TD, ix)) { 953c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor *I = CI->getOperand(0); 954c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor Changed = true; 955c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor } 956c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor } 957c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor } 958c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 959c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor if (isa<InlineAsm>(Callee) && !CS.doesNotThrow()) { 960c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // Inline asm calls cannot throw - mark them 'nounwind'. 961c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor CS.setDoesNotThrow(); 962c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor Changed = true; 963c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor } 964c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 965c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // Try to optimize the call if possible, we require DataLayout for most of 966c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // this. None of these calls are seen as possibly dead so go ahead and 967c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // delete the instruction now. 968c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor if (CallInst *CI = dyn_cast<CallInst>(CS.getInstruction())) { 969c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor Instruction *I = tryOptimizeCall(CI, TD); 970c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // If we changed something return the result, etc. Otherwise let 971c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // the fallthrough check. 972c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor if (I) return EraseInstFromFunction(*I); 973c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor } 974c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 975c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor return Changed ? CS.getInstruction() : 0; 976c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor} 977c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 978c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor// transformConstExprCastCall - If the callee is a constexpr cast of a function, 979c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor// attempt to move the cast to the arguments of the call/invoke. 980c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor// 981c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregorbool InstCombiner::transformConstExprCastCall(CallSite CS) { 982c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor Function *Callee = 9838bd5a69999cfd06b6b5a58fdd04e4f802b2df5a4Ted Kremenek dyn_cast<Function>(CS.getCalledValue()->stripPointerCasts()); 9848bd5a69999cfd06b6b5a58fdd04e4f802b2df5a4Ted Kremenek if (Callee == 0) 9858f06e0e9fec3ca501e5fb129f413adbfc88e82f8Ted Kremenek return false; 9868f06e0e9fec3ca501e5fb129f413adbfc88e82f8Ted Kremenek Instruction *Caller = CS.getInstruction(); 987a0536d8dd900bb48ea886bd68d777b03b061c068Ted Kremenek const AttributeSet &CallerPAL = CS.getAttributes(); 988a0536d8dd900bb48ea886bd68d777b03b061c068Ted Kremenek 98901829d3afafdfd355cbe93537bc408aeeed964c6Douglas Gregor // Okay, this is a cast from a function to a different type. Unless doing so 99001829d3afafdfd355cbe93537bc408aeeed964c6Douglas Gregor // would cause a type conversion of one of our arguments, change this call to 99101829d3afafdfd355cbe93537bc408aeeed964c6Douglas Gregor // be a direct call with arguments casted to the appropriate types. 99201829d3afafdfd355cbe93537bc408aeeed964c6Douglas Gregor // 99301829d3afafdfd355cbe93537bc408aeeed964c6Douglas Gregor FunctionType *FT = Callee->getFunctionType(); 99401829d3afafdfd355cbe93537bc408aeeed964c6Douglas Gregor Type *OldRetTy = Caller->getType(); 995fe72e9ceeae6cc8669cd8bb722425300190638eaDouglas Gregor Type *NewRetTy = FT->getReturnType(); 996fe72e9ceeae6cc8669cd8bb722425300190638eaDouglas Gregor 997fe72e9ceeae6cc8669cd8bb722425300190638eaDouglas Gregor if (NewRetTy->isStructTy()) 998fe72e9ceeae6cc8669cd8bb722425300190638eaDouglas Gregor return false; // TODO: Handle multiple return values. 999fe72e9ceeae6cc8669cd8bb722425300190638eaDouglas Gregor 1000fe72e9ceeae6cc8669cd8bb722425300190638eaDouglas Gregor // Check to see if we are changing the return type... 1001fe72e9ceeae6cc8669cd8bb722425300190638eaDouglas Gregor if (OldRetTy != NewRetTy) { 1002fe72e9ceeae6cc8669cd8bb722425300190638eaDouglas Gregor if (Callee->isDeclaration() && 100339d6f07b056c31e1e6b5946165ed4b23e7887f22Douglas Gregor // Conversion is ok if changing from one pointer type to another or from 100439d6f07b056c31e1e6b5946165ed4b23e7887f22Douglas Gregor // a pointer to an integer of the same size. 100574dbe640021d96a8dbb85c592471c04449ade81cDouglas Gregor !((OldRetTy->isPointerTy() || !TD || 100674dbe640021d96a8dbb85c592471c04449ade81cDouglas Gregor OldRetTy == TD->getIntPtrType(Caller->getContext())) && 10076931900f43cea558c6974075256c07728dbfecc6Douglas Gregor (NewRetTy->isPointerTy() || !TD || 10086931900f43cea558c6974075256c07728dbfecc6Douglas Gregor NewRetTy == TD->getIntPtrType(Caller->getContext())))) 10090a35bceb7768fc0be62cb644a4e31d8bfd9fb44aDouglas Gregor return false; // Cannot transform this return value. 10100a35bceb7768fc0be62cb644a4e31d8bfd9fb44aDouglas Gregor 10117e24256c95afb64b4d5abf201a0f9f0527cb4cf3Douglas Gregor if (!Caller->use_empty() && 10127e24256c95afb64b4d5abf201a0f9f0527cb4cf3Douglas Gregor // void -> non-void is handled specially 101350aa6acd0b8d40c8956372a69e0a73f0802a5494Ted Kremenek !NewRetTy->isVoidTy() && !CastInst::isCastable(NewRetTy, OldRetTy)) 10147e24256c95afb64b4d5abf201a0f9f0527cb4cf3Douglas Gregor return false; // Cannot transform this return value. 10151efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar 1016c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor if (!CallerPAL.isEmpty() && !Caller->use_empty()) { 1017c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor AttrBuilder RAttrs = CallerPAL.getRetAttributes(); 10181efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar if (RAttrs.hasAttributes(Attribute::typeIncompatible(NewRetTy))) 1019c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor return false; // Attribute not compatible with transformed value. 1020c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor } 1021c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 1022c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // If the callsite is an invoke instruction, and the return value is used by 1023c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // a PHI node in a successor, we cannot change the return type of the call 1024c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // because there is no place to put the cast instruction (without breaking 1025c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // the critical edge). Bail out in this case. 1026c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor if (!Caller->use_empty()) 1027c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor if (InvokeInst *II = dyn_cast<InvokeInst>(Caller)) 1028c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor for (Value::use_iterator UI = II->use_begin(), E = II->use_end(); 1029c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor UI != E; ++UI) 1030c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor if (PHINode *PN = dyn_cast<PHINode>(*UI)) 1031c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor if (PN->getParent() == II->getNormalDest() || 1032c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor PN->getParent() == II->getUnwindDest()) 1033c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor return false; 1034c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor } 1035c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 1036c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor unsigned NumActualArgs = unsigned(CS.arg_end()-CS.arg_begin()); 10373064ef9e604d19a0cfd0d8e3ed3055bfd83f88fdTed Kremenek unsigned NumCommonArgs = std::min(FT->getNumParams(), NumActualArgs); 10380b36e614aa19df72885d5e0de996f7fbb9874ec3Douglas Gregor 1039a67e03fdf1ae8a1f92463a307d0b6281f1161f40Douglas Gregor CallSite::arg_iterator AI = CS.arg_begin(); 1040a67e03fdf1ae8a1f92463a307d0b6281f1161f40Douglas Gregor for (unsigned i = 0, e = NumCommonArgs; i != e; ++i, ++AI) { 10410b36e614aa19df72885d5e0de996f7fbb9874ec3Douglas Gregor Type *ParamTy = FT->getParamType(i); 10420b36e614aa19df72885d5e0de996f7fbb9874ec3Douglas Gregor Type *ActTy = (*AI)->getType(); 10436931900f43cea558c6974075256c07728dbfecc6Douglas Gregor 10446931900f43cea558c6974075256c07728dbfecc6Douglas Gregor if (!CastInst::isCastable(ActTy, ParamTy)) 10456931900f43cea558c6974075256c07728dbfecc6Douglas Gregor return false; // Cannot transform this parameter value. 10466931900f43cea558c6974075256c07728dbfecc6Douglas Gregor 1047a67e03fdf1ae8a1f92463a307d0b6281f1161f40Douglas Gregor Attribute Attrs = CallerPAL.getParamAttributes(i + 1); 104836897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor if (AttrBuilder(Attrs). 104936897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor hasAttributes(Attribute::typeIncompatible(ParamTy))) 1050a67e03fdf1ae8a1f92463a307d0b6281f1161f40Douglas Gregor return false; // Attribute not compatible with transformed value. 1051a67e03fdf1ae8a1f92463a307d0b6281f1161f40Douglas Gregor 105236897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor // If the parameter is passed as a byval argument, then we have to have a 105336897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor // sized type and the sized type has to have the same size as the old type. 105436897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor if (ParamTy != ActTy && Attrs.hasAttribute(Attribute::ByVal)) { 105536897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor PointerType *ParamPTy = dyn_cast<PointerType>(ParamTy); 105636897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor if (ParamPTy == 0 || !ParamPTy->getElementType()->isSized() || TD == 0) 105736897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor return false; 105836897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor 105936897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor Type *CurElTy = cast<PointerType>(ActTy)->getElementType(); 106036897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor if (TD->getTypeAllocSize(CurElTy) != 106136897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor TD->getTypeAllocSize(ParamPTy->getElementType())) 106236897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor return false; 106336897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor } 106436897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor 106536897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor // Converting from one pointer type to another or between a pointer and an 106636897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor // integer of the same size is safe even if we do not have a body. 106736897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor bool isConvertible = ActTy == ParamTy || 106836897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor (TD && ((ParamTy->isPointerTy() || 10691f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor ParamTy == TD->getIntPtrType(Caller->getContext())) && 10701f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor (ActTy->isPointerTy() || 10711f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor ActTy == TD->getIntPtrType(Caller->getContext())))); 10721f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor if (Callee->isDeclaration() && !isConvertible) return false; 10731f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor } 10741f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor 10751f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor if (Callee->isDeclaration()) { 10761f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor // Do not delete arguments unless we have a function body. 10771f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor if (FT->getNumParams() < NumActualArgs && !FT->isVarArg()) 10781f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor return false; 10791f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor 10801f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor // If the callee is just a declaration, don't change the varargsness of the 10811f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor // call. We don't want to introduce a varargs call where one doesn't 10821f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor // already exist. 10831f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor PointerType *APTy = cast<PointerType>(CS.getCalledValue()->getType()); 10841f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor if (FT->isVarArg()!=cast<FunctionType>(APTy->getElementType())->isVarArg()) 10851f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor return false; 10861f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor 10871f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor // If both the callee and the cast type are varargs, we still have to make 10881f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor // sure the number of fixed parameters are the same or we have the same 10891f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor // ABI issues as if we introduce a varargs call. 10901f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor if (FT->isVarArg() && 10911f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor cast<FunctionType>(APTy->getElementType())->isVarArg() && 10921f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor FT->getNumParams() != 10931f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor cast<FunctionType>(APTy->getElementType())->getNumParams()) 10941f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor return false; 10951f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor } 10961f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor 10971f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor if (FT->getNumParams() < NumActualArgs && FT->isVarArg() && 10981f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor !CallerPAL.isEmpty()) 10991f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor // In this case we have more arguments than the new function type, but we 11001f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor // won't be dropping them. Check that these extra arguments have attributes 11011f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor // that are compatible with being a vararg call argument. 11021f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor for (unsigned i = CallerPAL.getNumSlots(); i; --i) { 11031f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor if (CallerPAL.getSlot(i - 1).Index <= FT->getNumParams()) 11041f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor break; 11051f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor Attribute PAttrs = CallerPAL.getSlot(i - 1).Attrs; 11061f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor // Check if it has an attribute that's incompatible with varargs. 11071f60d9ea523fc321d811fe880ba9a1ec74fa8f9bDouglas Gregor if (PAttrs.hasAttribute(Attribute::StructRet)) 11081efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar return false; 1109c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor } 1110c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 1111c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 1112c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // Okay, we decided that this is a safe thing to do: go ahead and start 1113c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // inserting cast instructions as necessary. 1114ebfa339321f8a4df9d5011e591a615d5765107d5Ted Kremenek std::vector<Value*> Args; 1115ebfa339321f8a4df9d5011e591a615d5765107d5Ted Kremenek Args.reserve(NumActualArgs); 11161efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar SmallVector<AttributeWithIndex, 8> attrVec; 1117c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor attrVec.reserve(NumCommonArgs); 1118c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 11191efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar // Get any return attributes. 1120c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor AttrBuilder RAttrs = CallerPAL.getRetAttributes(); 1121c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 11221efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar // If the return value is not being used, the type may not be compatible 1123c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // with the existing attributes. Wipe out any problematic attributes. 1124c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor RAttrs.removeAttributes(Attribute::typeIncompatible(NewRetTy)); 1125c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 1126c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // Add the new return attributes. 1127c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor if (RAttrs.hasAttributes()) 1128c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor attrVec.push_back( 1129c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor AttributeWithIndex::get(AttributeSet::ReturnIndex, 11301efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar Attribute::get(FT->getContext(), RAttrs))); 1131c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 1132c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor AI = CS.arg_begin(); 1133c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor for (unsigned i = 0; i != NumCommonArgs; ++i, ++AI) { 1134c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor Type *ParamTy = FT->getParamType(i); 1135c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor if ((*AI)->getType() == ParamTy) { 11361efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar Args.push_back(*AI); 1137c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor } else { 1138c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor Instruction::CastOps opcode = CastInst::getCastOpcode(*AI, 1139c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor false, ParamTy, false); 1140c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor Args.push_back(Builder->CreateCast(opcode, *AI, ParamTy)); 1141c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor } 11421efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar 1143c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // Add any parameter attributes. 1144c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor Attribute PAttrs = CallerPAL.getParamAttributes(i + 1); 11451efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar if (PAttrs.hasAttributes()) 1146c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor attrVec.push_back(AttributeWithIndex::get(i + 1, PAttrs)); 1147c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor } 1148c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 11491ee6cad59f017601ea54fbb4f62a6e8d69897e3eTed Kremenek // If the function takes more arguments than the call was taking, add them 11501ee6cad59f017601ea54fbb4f62a6e8d69897e3eTed Kremenek // now. 11511ee6cad59f017601ea54fbb4f62a6e8d69897e3eTed Kremenek for (unsigned i = NumCommonArgs; i != FT->getNumParams(); ++i) 11521ee6cad59f017601ea54fbb4f62a6e8d69897e3eTed Kremenek Args.push_back(Constant::getNullValue(FT->getParamType(i))); 11531ee6cad59f017601ea54fbb4f62a6e8d69897e3eTed Kremenek 11541efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar // If we are removing arguments to the function, emit an obnoxious warning. 1155c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor if (FT->getNumParams() < NumActualArgs) { 1156c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // TODO: if (!FT->isVarArg()) this call may be unreachable. PR14722 1157c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor if (FT->isVarArg()) { 1158c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // Add all of the arguments in their promoted form to the arg list. 1159c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor for (unsigned i = FT->getNumParams(); i != NumActualArgs; ++i, ++AI) { 1160c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor Type *PTy = getPromotedType((*AI)->getType()); 1161c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor if (PTy != (*AI)->getType()) { 1162c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // Must promote to pass through va_arg area! 1163c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor Instruction::CastOps opcode = 1164c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor CastInst::getCastOpcode(*AI, false, PTy, false); 1165c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor Args.push_back(Builder->CreateCast(opcode, *AI, PTy)); 1166c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor } else { 116736897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor Args.push_back(*AI); 116836897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor } 116936897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor 117036897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor // Add any parameter attributes. 117136897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor Attribute PAttrs = CallerPAL.getParamAttributes(i + 1); 117236897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor if (PAttrs.hasAttributes()) 117336897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor attrVec.push_back(AttributeWithIndex::get(i + 1, PAttrs)); 117436897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor } 117536897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor } 117636897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor } 117736897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor 117836897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor Attribute FnAttrs = CallerPAL.getFnAttributes(); 117936897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor if (FnAttrs.hasAttributes()) 118036897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor attrVec.push_back(AttributeWithIndex::get(AttributeSet::FunctionIndex, 118136897b05ca2886e287f01802614bc10cbadcec22Douglas Gregor FnAttrs)); 11821efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar 1183c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor if (NewRetTy->isVoidTy()) 1184c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor Caller->setName(""); // Void type should not have a name. 1185c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 1186c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor const AttributeSet &NewCallerPAL = AttributeSet::get(Callee->getContext(), 1187c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor attrVec); 1188c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 1189e77f443dbca8cdc23e5aa94a2653367e4a7cbe47Ted Kremenek Instruction *NC; 1190e77f443dbca8cdc23e5aa94a2653367e4a7cbe47Ted Kremenek if (InvokeInst *II = dyn_cast<InvokeInst>(Caller)) { 1191e77f443dbca8cdc23e5aa94a2653367e4a7cbe47Ted Kremenek NC = Builder->CreateInvoke(Callee, II->getNormalDest(), 1192e77f443dbca8cdc23e5aa94a2653367e4a7cbe47Ted Kremenek II->getUnwindDest(), Args); 1193e77f443dbca8cdc23e5aa94a2653367e4a7cbe47Ted Kremenek NC->takeName(II); 1194e77f443dbca8cdc23e5aa94a2653367e4a7cbe47Ted Kremenek cast<InvokeInst>(NC)->setCallingConv(II->getCallingConv()); 1195e77f443dbca8cdc23e5aa94a2653367e4a7cbe47Ted Kremenek cast<InvokeInst>(NC)->setAttributes(NewCallerPAL); 1196e77f443dbca8cdc23e5aa94a2653367e4a7cbe47Ted Kremenek } else { 1197e77f443dbca8cdc23e5aa94a2653367e4a7cbe47Ted Kremenek CallInst *CI = cast<CallInst>(Caller); 1198e77f443dbca8cdc23e5aa94a2653367e4a7cbe47Ted Kremenek NC = Builder->CreateCall(Callee, Args); 1199e77f443dbca8cdc23e5aa94a2653367e4a7cbe47Ted Kremenek NC->takeName(CI); 1200e77f443dbca8cdc23e5aa94a2653367e4a7cbe47Ted Kremenek if (CI->isTailCall()) 1201857e918a8a40deb128840308a318bf623d68295fTed Kremenek cast<CallInst>(NC)->setTailCall(); 1202857e918a8a40deb128840308a318bf623d68295fTed Kremenek cast<CallInst>(NC)->setCallingConv(CI->getCallingConv()); 12039f1e3ff3b3095967e2b92b57a53524e2d6bb141cDouglas Gregor cast<CallInst>(NC)->setAttributes(NewCallerPAL); 12049f1e3ff3b3095967e2b92b57a53524e2d6bb141cDouglas Gregor } 12059f1e3ff3b3095967e2b92b57a53524e2d6bb141cDouglas Gregor 1206572feb2a190b5e8b04fb06c4ac50ee0f61e93ff0Douglas Gregor // Insert a cast of the return type as necessary. 1207572feb2a190b5e8b04fb06c4ac50ee0f61e93ff0Douglas Gregor Value *NV = NC; 1208ecdcb883cbc6bb4a2445dc6f02d58d9bdb54a0edDouglas Gregor if (OldRetTy != NV->getType() && !Caller->use_empty()) { 12099f1e3ff3b3095967e2b92b57a53524e2d6bb141cDouglas Gregor if (!NV->getType()->isVoidTy()) { 1210ecdcb883cbc6bb4a2445dc6f02d58d9bdb54a0edDouglas Gregor Instruction::CastOps opcode = 1211c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor CastInst::getCastOpcode(NC, false, OldRetTy, false); 1212c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor NV = NC = CastInst::Create(opcode, NC, OldRetTy); 1213c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor NC->setDebugLoc(Caller->getDebugLoc()); 1214c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 1215c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // If this is an invoke instruction, we should insert it after the first 1216c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // non-phi, instruction in the normal successor block. 12171efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar if (InvokeInst *II = dyn_cast<InvokeInst>(Caller)) { 1218c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor BasicBlock::iterator I = II->getNormalDest()->getFirstInsertionPt(); 1219c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor InsertNewInstBefore(NC, *I); 1220c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor } else { 1221c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // Otherwise, it's a call, just insert cast right after the call. 1222c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor InsertNewInstBefore(NC, *Caller); 1223c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor } 1224c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor Worklist.AddUsersToWorkList(*Caller); 1225c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor } else { 1226c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor NV = UndefValue::get(Caller->getType()); 1227c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor } 1228c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor } 1229c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 1230c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor if (!Caller->use_empty()) 1231c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor ReplaceInstUsesWith(*Caller, NV); 1232c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 1233c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor EraseInstFromFunction(*Caller); 12341efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar return true; 1235c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor} 1236c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 1237c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor// transformCallThroughTrampoline - Turn a call to a function created by 1238c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor// init_trampoline / adjust_trampoline intrinsic pair into a direct call to the 1239c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor// underlying function. 1240c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor// 12411efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel DunbarInstruction * 1242c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas GregorInstCombiner::transformCallThroughTrampoline(CallSite CS, 1243c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor IntrinsicInst *Tramp) { 1244c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor Value *Callee = CS.getCalledValue(); 1245c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor PointerType *PTy = cast<PointerType>(Callee->getType()); 12461efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar FunctionType *FTy = cast<FunctionType>(PTy->getElementType()); 1247c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor const AttributeSet &Attrs = CS.getAttributes(); 1248c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 1249c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // If the call already has the 'nest' attribute somewhere then give up - 1250c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // otherwise 'nest' would occur twice after splicing in the chain. 1251c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor if (Attrs.hasAttrSomewhere(Attribute::Nest)) 1252c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor return 0; 1253c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 1254c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor assert(Tramp && 1255c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor "transformCallThroughTrampoline called with incorrect CallSite."); 1256c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 1257c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor Function *NestF =cast<Function>(Tramp->getArgOperand(1)->stripPointerCasts()); 1258c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor PointerType *NestFPTy = cast<PointerType>(NestF->getType()); 12591efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar FunctionType *NestFTy = cast<FunctionType>(NestFPTy->getElementType()); 1260c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 1261c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor const AttributeSet &NestAttrs = NestF->getAttributes(); 1262c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor if (!NestAttrs.isEmpty()) { 1263c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor unsigned NestIdx = 1; 1264c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor Type *NestTy = 0; 1265c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor Attribute NestAttr; 1266c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 1267c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // Look for a parameter marked with the 'nest' attribute. 1268c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor for (FunctionType::param_iterator I = NestFTy->param_begin(), 1269c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor E = NestFTy->param_end(); I != E; ++NestIdx, ++I) 1270c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor if (NestAttrs.getParamAttributes(NestIdx).hasAttribute(Attribute::Nest)){ 1271c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // Record the parameter type and any other attributes. 1272c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor NestTy = *I; 1273c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor NestAttr = NestAttrs.getParamAttributes(NestIdx); 1274c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor break; 1275c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor } 1276c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 1277c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor if (NestTy) { 1278c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor Instruction *Caller = CS.getInstruction(); 1279c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor std::vector<Value*> NewArgs; 1280c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor NewArgs.reserve(unsigned(CS.arg_end()-CS.arg_begin())+1); 1281c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 1282c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor SmallVector<AttributeWithIndex, 8> NewAttrs; 1283c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor NewAttrs.reserve(Attrs.getNumSlots() + 1); 1284c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 1285c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // Insert the nest argument into the call argument list, which may 1286c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // mean appending it. Likewise for attributes. 1287c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor 1288c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // Add any result attributes. 1289c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor Attribute Attr = Attrs.getRetAttributes(); 1290c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor if (Attr.hasAttributes()) 12911efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar NewAttrs.push_back(AttributeWithIndex::get(AttributeSet::ReturnIndex, 1292c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor Attr)); 12931efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar 1294c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor { 1295c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor unsigned Idx = 1; 1296c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor CallSite::arg_iterator I = CS.arg_begin(), E = CS.arg_end(); 12971efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar do { 12981efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar if (Idx == NestIdx) { 1299c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor // Add the chain argument and attributes. 1300c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor Value *NestVal = Tramp->getArgOperand(2); 13011efcf3d137c11fb6b21c385911e0d2ca59ca94c3Daniel Dunbar if (NestVal->getType() != NestTy) 1302ad6eff611a4391f89fd6c458db16993f76e7f5d0Ted Kremenek NestVal = Builder->CreateBitCast(NestVal, NestTy, "nest"); 13039f1e3ff3b3095967e2b92b57a53524e2d6bb141cDouglas Gregor NewArgs.push_back(NestVal); 13049f1e3ff3b3095967e2b92b57a53524e2d6bb141cDouglas Gregor NewAttrs.push_back(AttributeWithIndex::get(NestIdx, NestAttr)); 13059f1e3ff3b3095967e2b92b57a53524e2d6bb141cDouglas Gregor } 13069f1e3ff3b3095967e2b92b57a53524e2d6bb141cDouglas Gregor 13079f1e3ff3b3095967e2b92b57a53524e2d6bb141cDouglas Gregor if (I == E) 13089f1e3ff3b3095967e2b92b57a53524e2d6bb141cDouglas Gregor break; 1309ad6eff611a4391f89fd6c458db16993f76e7f5d0Ted Kremenek 1310ad6eff611a4391f89fd6c458db16993f76e7f5d0Ted Kremenek // Add the original argument and attributes. 1311ad6eff611a4391f89fd6c458db16993f76e7f5d0Ted Kremenek NewArgs.push_back(*I); 1312ad6eff611a4391f89fd6c458db16993f76e7f5d0Ted Kremenek Attr = Attrs.getParamAttributes(Idx); 1313ad6eff611a4391f89fd6c458db16993f76e7f5d0Ted Kremenek if (Attr.hasAttributes()) 1314c42fefa51f7555bb3644a7cde2ca4bfd0d848d74Douglas Gregor NewAttrs.push_back 131516b4259aecaa22b642d35d36fd89965ed700c1e0Ted Kremenek (AttributeWithIndex::get(Idx + (Idx >= NestIdx), Attr)); 131616b4259aecaa22b642d35d36fd89965ed700c1e0Ted Kremenek 131716b4259aecaa22b642d35d36fd89965ed700c1e0Ted Kremenek ++Idx, ++I; 131816b4259aecaa22b642d35d36fd89965ed700c1e0Ted Kremenek } while (1); 131916b4259aecaa22b642d35d36fd89965ed700c1e0Ted Kremenek } 132016b4259aecaa22b642d35d36fd89965ed700c1e0Ted Kremenek 132116b4259aecaa22b642d35d36fd89965ed700c1e0Ted Kremenek // Add any function attributes. 132216b4259aecaa22b642d35d36fd89965ed700c1e0Ted Kremenek Attr = Attrs.getFnAttributes(); 132316b4259aecaa22b642d35d36fd89965ed700c1e0Ted Kremenek if (Attr.hasAttributes()) 132416b4259aecaa22b642d35d36fd89965ed700c1e0Ted Kremenek NewAttrs.push_back(AttributeWithIndex::get(AttributeSet::FunctionIndex, 132516b4259aecaa22b642d35d36fd89965ed700c1e0Ted Kremenek Attr)); 132616b4259aecaa22b642d35d36fd89965ed700c1e0Ted Kremenek 132716b4259aecaa22b642d35d36fd89965ed700c1e0Ted Kremenek // The trampoline may have been bitcast to a bogus type (FTy). 132816b4259aecaa22b642d35d36fd89965ed700c1e0Ted Kremenek // Handle this by synthesizing a new function type, equal to FTy 132916b4259aecaa22b642d35d36fd89965ed700c1e0Ted Kremenek // with the chain parameter inserted. 133016b4259aecaa22b642d35d36fd89965ed700c1e0Ted Kremenek 133116b4259aecaa22b642d35d36fd89965ed700c1e0Ted Kremenek std::vector<Type*> NewTypes; 133216b4259aecaa22b642d35d36fd89965ed700c1e0Ted Kremenek NewTypes.reserve(FTy->getNumParams()+1); 133316b4259aecaa22b642d35d36fd89965ed700c1e0Ted Kremenek 133416b4259aecaa22b642d35d36fd89965ed700c1e0Ted Kremenek // Insert the chain's type into the list of parameter types, which may 133516b4259aecaa22b642d35d36fd89965ed700c1e0Ted Kremenek // mean appending it. 133645e1dae500bba7a9ef5b8206263a5609c07c6f03Ted Kremenek { 133716b4259aecaa22b642d35d36fd89965ed700c1e0Ted Kremenek unsigned Idx = 1; 133816b4259aecaa22b642d35d36fd89965ed700c1e0Ted Kremenek FunctionType::param_iterator I = FTy->param_begin(), 133916b4259aecaa22b642d35d36fd89965ed700c1e0Ted Kremenek E = FTy->param_end(); 134016b4259aecaa22b642d35d36fd89965ed700c1e0Ted Kremenek 134158ddb60f409125eda5436c4a1f070f7fa4744295Douglas Gregor do { 134258ddb60f409125eda5436c4a1f070f7fa4744295Douglas Gregor if (Idx == NestIdx) 134358ddb60f409125eda5436c4a1f070f7fa4744295Douglas Gregor // Add the chain's type. 134458ddb60f409125eda5436c4a1f070f7fa4744295Douglas Gregor NewTypes.push_back(NestTy); 134558ddb60f409125eda5436c4a1f070f7fa4744295Douglas Gregor 134658ddb60f409125eda5436c4a1f070f7fa4744295Douglas Gregor if (I == E) 134758ddb60f409125eda5436c4a1f070f7fa4744295Douglas Gregor break; 134858ddb60f409125eda5436c4a1f070f7fa4744295Douglas Gregor 134958ddb60f409125eda5436c4a1f070f7fa4744295Douglas Gregor // Add the original type. 135058ddb60f409125eda5436c4a1f070f7fa4744295Douglas Gregor NewTypes.push_back(*I); 135145e1dae500bba7a9ef5b8206263a5609c07c6f03Ted Kremenek 135245e1dae500bba7a9ef5b8206263a5609c07c6f03Ted Kremenek ++Idx, ++I; 135345e1dae500bba7a9ef5b8206263a5609c07c6f03Ted Kremenek } while (1); 13546cd1e7cb04d1da66e8b5675062152ff60bbc354fTed Kremenek } 135545e1dae500bba7a9ef5b8206263a5609c07c6f03Ted Kremenek 135645e1dae500bba7a9ef5b8206263a5609c07c6f03Ted Kremenek // Replace the trampoline call with a direct call. Let the generic 13576cd1e7cb04d1da66e8b5675062152ff60bbc354fTed Kremenek // code sort out any function type mismatches. 135845e1dae500bba7a9ef5b8206263a5609c07c6f03Ted Kremenek FunctionType *NewFTy = FunctionType::get(FTy->getReturnType(), NewTypes, 135945e1dae500bba7a9ef5b8206263a5609c07c6f03Ted Kremenek FTy->isVarArg()); 136045e1dae500bba7a9ef5b8206263a5609c07c6f03Ted Kremenek Constant *NewCallee = 136145e1dae500bba7a9ef5b8206263a5609c07c6f03Ted Kremenek NestF->getType() == PointerType::getUnqual(NewFTy) ? 136245e1dae500bba7a9ef5b8206263a5609c07c6f03Ted Kremenek NestF : ConstantExpr::getBitCast(NestF, 136345e1dae500bba7a9ef5b8206263a5609c07c6f03Ted Kremenek PointerType::getUnqual(NewFTy)); 136445e1dae500bba7a9ef5b8206263a5609c07c6f03Ted Kremenek const AttributeSet &NewPAL = AttributeSet::get(FTy->getContext(), NewAttrs); 13652be5bc9ad3981347a000742f81b91ab3080f1214Douglas Gregor 13662be5bc9ad3981347a000742f81b91ab3080f1214Douglas Gregor Instruction *NewCaller; 13672be5bc9ad3981347a000742f81b91ab3080f1214Douglas Gregor if (InvokeInst *II = dyn_cast<InvokeInst>(Caller)) { 13682be5bc9ad3981347a000742f81b91ab3080f1214Douglas Gregor NewCaller = InvokeInst::Create(NewCallee, 13692be5bc9ad3981347a000742f81b91ab3080f1214Douglas Gregor II->getNormalDest(), II->getUnwindDest(), 13702be5bc9ad3981347a000742f81b91ab3080f1214Douglas Gregor NewArgs); 13712be5bc9ad3981347a000742f81b91ab3080f1214Douglas Gregor cast<InvokeInst>(NewCaller)->setCallingConv(II->getCallingConv()); 13722be5bc9ad3981347a000742f81b91ab3080f1214Douglas Gregor cast<InvokeInst>(NewCaller)->setAttributes(NewPAL); 13732be5bc9ad3981347a000742f81b91ab3080f1214Douglas Gregor } else { 13742be5bc9ad3981347a000742f81b91ab3080f1214Douglas Gregor NewCaller = CallInst::Create(NewCallee, NewArgs); 13752be5bc9ad3981347a000742f81b91ab3080f1214Douglas Gregor if (cast<CallInst>(Caller)->isTailCall()) 13762be5bc9ad3981347a000742f81b91ab3080f1214Douglas Gregor cast<CallInst>(NewCaller)->setTailCall(); 13772be5bc9ad3981347a000742f81b91ab3080f1214Douglas Gregor cast<CallInst>(NewCaller)-> 13782be5bc9ad3981347a000742f81b91ab3080f1214Douglas Gregor setCallingConv(cast<CallInst>(Caller)->getCallingConv()); 13792be5bc9ad3981347a000742f81b91ab3080f1214Douglas Gregor cast<CallInst>(NewCaller)->setAttributes(NewPAL); 13802be5bc9ad3981347a000742f81b91ab3080f1214Douglas Gregor } 13812be5bc9ad3981347a000742f81b91ab3080f1214Douglas Gregor 13822be5bc9ad3981347a000742f81b91ab3080f1214Douglas Gregor return NewCaller; 13832be5bc9ad3981347a000742f81b91ab3080f1214Douglas Gregor } 13842be5bc9ad3981347a000742f81b91ab3080f1214Douglas Gregor } 13852be5bc9ad3981347a000742f81b91ab3080f1214Douglas Gregor 13862be5bc9ad3981347a000742f81b91ab3080f1214Douglas Gregor // Replace the trampoline call with a direct call. Since there is no 'nest' 13872be5bc9ad3981347a000742f81b91ab3080f1214Douglas Gregor // parameter, there is no need to adjust the argument list. Let the generic 13882be5bc9ad3981347a000742f81b91ab3080f1214Douglas Gregor // code sort out any function type mismatches. 13892be5bc9ad3981347a000742f81b91ab3080f1214Douglas Gregor Constant *NewCallee = 13902be5bc9ad3981347a000742f81b91ab3080f1214Douglas Gregor NestF->getType() == PTy ? NestF : 13912be5bc9ad3981347a000742f81b91ab3080f1214Douglas Gregor ConstantExpr::getBitCast(NestF, PTy); 13922be5bc9ad3981347a000742f81b91ab3080f1214Douglas Gregor CS.setCalledFunction(NewCallee); 13932be5bc9ad3981347a000742f81b91ab3080f1214Douglas Gregor return CS.getInstruction(); 13942be5bc9ad3981347a000742f81b91ab3080f1214Douglas Gregor} 13952be5bc9ad3981347a000742f81b91ab3080f1214Douglas Gregor