InstCombineCalls.cpp revision 4ec2258ffb495d7ce00177e447740ef1123a27db
1753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner//===- InstCombineCalls.cpp -----------------------------------------------===// 2753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner// 3753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner// The LLVM Compiler Infrastructure 4753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner// 5753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner// This file is distributed under the University of Illinois Open Source 6753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner// License. See LICENSE.TXT for details. 7753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner// 8753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner//===----------------------------------------------------------------------===// 9753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner// 10753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner// This file implements the visitCall and visitInvoke functions. 11753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner// 12753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner//===----------------------------------------------------------------------===// 13753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 14753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner#include "InstCombine.h" 15753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner#include "llvm/IntrinsicInst.h" 16753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner#include "llvm/Support/CallSite.h" 17753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner#include "llvm/Target/TargetData.h" 18753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner#include "llvm/Analysis/MemoryBuiltins.h" 1927ceaa13f820e33c44e29adc2095dd3e1e69d09fEric Christopher#include "llvm/Transforms/Utils/BuildLibCalls.h" 20753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattnerusing namespace llvm; 21753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 22753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner/// getPromotedType - Return the specified type promoted as it would be to pass 23753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner/// though a va_arg area. 24753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattnerstatic const Type *getPromotedType(const Type *Ty) { 25753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (const IntegerType* ITy = dyn_cast<IntegerType>(Ty)) { 26753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (ITy->getBitWidth() < 32) 27753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return Type::getInt32Ty(Ty->getContext()); 28753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 29753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return Ty; 30753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner} 31753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 32753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner/// EnforceKnownAlignment - If the specified pointer points to an object that 33753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner/// we control, modify the object's alignment to PrefAlign. This isn't 34753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner/// often possible though. If alignment is important, a more reliable approach 35753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner/// is to simply align all global variables and allocation instructions to 36753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner/// their preferred alignment from the beginning. 37753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner/// 38753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattnerstatic unsigned EnforceKnownAlignment(Value *V, 39753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner unsigned Align, unsigned PrefAlign) { 40753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 41753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner User *U = dyn_cast<User>(V); 42753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (!U) return Align; 43753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 44753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner switch (Operator::getOpcode(U)) { 45753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner default: break; 46753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner case Instruction::BitCast: 47753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return EnforceKnownAlignment(U->getOperand(0), Align, PrefAlign); 48753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner case Instruction::GetElementPtr: { 49753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // If all indexes are zero, it is just the alignment of the base pointer. 50753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner bool AllZeroOperands = true; 51753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner for (User::op_iterator i = U->op_begin() + 1, e = U->op_end(); i != e; ++i) 52753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (!isa<Constant>(*i) || 53753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner !cast<Constant>(*i)->isNullValue()) { 54753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner AllZeroOperands = false; 55753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner break; 56753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 57753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 58753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (AllZeroOperands) { 59753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Treat this like a bitcast. 60753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return EnforceKnownAlignment(U->getOperand(0), Align, PrefAlign); 61753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 62753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner break; 63753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 64753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 65753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 66753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (GlobalValue *GV = dyn_cast<GlobalValue>(V)) { 67753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // If there is a large requested alignment and we can, bump up the alignment 68753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // of the global. 69753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (!GV->isDeclaration()) { 70753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (GV->getAlignment() >= PrefAlign) 71753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Align = GV->getAlignment(); 72753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner else { 73753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner GV->setAlignment(PrefAlign); 74753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Align = PrefAlign; 75753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 76753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 77753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } else if (AllocaInst *AI = dyn_cast<AllocaInst>(V)) { 78753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // If there is a requested alignment and if this is an alloca, round up. 79753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (AI->getAlignment() >= PrefAlign) 80753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Align = AI->getAlignment(); 81753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner else { 82753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner AI->setAlignment(PrefAlign); 83753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Align = PrefAlign; 84753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 85753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 86753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 87753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return Align; 88753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner} 89753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 90753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner/// GetOrEnforceKnownAlignment - If the specified pointer has an alignment that 91753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner/// we can determine, return it, otherwise return 0. If PrefAlign is specified, 92753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner/// and it is more than the alignment of the ultimate object, see if we can 93753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner/// increase the alignment of the ultimate object, making this check succeed. 94753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattnerunsigned InstCombiner::GetOrEnforceKnownAlignment(Value *V, 95753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner unsigned PrefAlign) { 96753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner unsigned BitWidth = TD ? TD->getTypeSizeInBits(V->getType()) : 97753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner sizeof(PrefAlign) * CHAR_BIT; 98753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner APInt Mask = APInt::getAllOnesValue(BitWidth); 99753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner APInt KnownZero(BitWidth, 0), KnownOne(BitWidth, 0); 100753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner ComputeMaskedBits(V, Mask, KnownZero, KnownOne); 101753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner unsigned TrailZ = KnownZero.countTrailingOnes(); 102753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner unsigned Align = 1u << std::min(BitWidth - 1, TrailZ); 103753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 104753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (PrefAlign > Align) 105753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Align = EnforceKnownAlignment(V, Align, PrefAlign); 1060c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 107753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // We don't need to make any adjustment. 108753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return Align; 109753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner} 110753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 111753a2b464d0628231bd3dce645edd05dfbaa3a06Chris LattnerInstruction *InstCombiner::SimplifyMemTransfer(MemIntrinsic *MI) { 1124ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif unsigned DstAlign = GetOrEnforceKnownAlignment(MI->getOperand(0)); 1134ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif unsigned SrcAlign = GetOrEnforceKnownAlignment(MI->getOperand(1)); 114753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner unsigned MinAlign = std::min(DstAlign, SrcAlign); 115753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner unsigned CopyAlign = MI->getAlignment(); 116753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 117753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (CopyAlign < MinAlign) { 1180c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher MI->setAlignment(ConstantInt::get(MI->getAlignmentType(), 119753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner MinAlign, false)); 120753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return MI; 121753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 1220c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 123753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // If MemCpyInst length is 1/2/4/8 bytes then replace memcpy with 124753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // load/store. 1254ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif ConstantInt *MemOpLength = dyn_cast<ConstantInt>(MI->getOperand(2)); 126753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (MemOpLength == 0) return 0; 1270c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 128753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Source and destination pointer types are always "i8*" for intrinsic. See 129753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // if the size is something we can handle with a single primitive load/store. 130753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // A single load+store correctly handles overlapping memory in the memmove 131753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // case. 132753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner unsigned Size = MemOpLength->getZExtValue(); 133753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (Size == 0) return MI; // Delete this mem transfer. 1340c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 135753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (Size > 8 || (Size&(Size-1))) 136753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return 0; // If not 1/2/4/8 bytes, exit. 1370c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 138753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Use an integer load+store unless we can find something better. 13920adc9dc4650313f017b27d9818eb2176238113dMon P Wang unsigned SrcAddrSp = 140607a7ab3da72a2eb53553a520507cbb8068dd1d8Gabor Greif cast<PointerType>(MI->getOperand(1)->getType())->getAddressSpace(); 1414ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif unsigned DstAddrSp = 1424ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif cast<PointerType>(MI->getOperand(0)->getType())->getAddressSpace(); 14320adc9dc4650313f017b27d9818eb2176238113dMon P Wang 14420adc9dc4650313f017b27d9818eb2176238113dMon P Wang const IntegerType* IntType = IntegerType::get(MI->getContext(), Size<<3); 14520adc9dc4650313f017b27d9818eb2176238113dMon P Wang Type *NewSrcPtrTy = PointerType::get(IntType, SrcAddrSp); 14620adc9dc4650313f017b27d9818eb2176238113dMon P Wang Type *NewDstPtrTy = PointerType::get(IntType, DstAddrSp); 1470c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 148753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Memcpy forces the use of i8* for the source and destination. That means 149753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // that if you're using memcpy to move one double around, you'll get a cast 150753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // from double* to i8*. We'd much rather use a double load+store rather than 151753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // an i64 load+store, here because this improves the odds that the source or 152753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // dest address will be promotable. See if we can find a better type than the 153753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // integer datatype. 1544ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif Value *StrippedDest = MI->getOperand(0)->stripPointerCasts(); 1554ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif if (StrippedDest != MI->getOperand(0)) { 156753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner const Type *SrcETy = cast<PointerType>(StrippedDest->getType()) 157753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner ->getElementType(); 158753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (TD && SrcETy->isSized() && TD->getTypeStoreSize(SrcETy) == Size) { 159753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // The SrcETy might be something like {{{double}}} or [1 x double]. Rip 160753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // down through these levels if so. 161753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner while (!SrcETy->isSingleValueType()) { 162753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (const StructType *STy = dyn_cast<StructType>(SrcETy)) { 163753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (STy->getNumElements() == 1) 164753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner SrcETy = STy->getElementType(0); 165753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner else 166753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner break; 167753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } else if (const ArrayType *ATy = dyn_cast<ArrayType>(SrcETy)) { 168753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (ATy->getNumElements() == 1) 169753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner SrcETy = ATy->getElementType(); 170753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner else 171753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner break; 172753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } else 173753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner break; 174753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 1750c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 17620adc9dc4650313f017b27d9818eb2176238113dMon P Wang if (SrcETy->isSingleValueType()) { 17720adc9dc4650313f017b27d9818eb2176238113dMon P Wang NewSrcPtrTy = PointerType::get(SrcETy, SrcAddrSp); 17820adc9dc4650313f017b27d9818eb2176238113dMon P Wang NewDstPtrTy = PointerType::get(SrcETy, DstAddrSp); 17920adc9dc4650313f017b27d9818eb2176238113dMon P Wang } 180753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 181753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 1820c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 1830c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 184753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // If the memcpy/memmove provides better alignment info than we can 185753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // infer, use it. 186753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner SrcAlign = std::max(SrcAlign, CopyAlign); 187753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner DstAlign = std::max(DstAlign, CopyAlign); 1880c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 1894ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif Value *Src = Builder->CreateBitCast(MI->getOperand(1), NewSrcPtrTy); 1904ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif Value *Dest = Builder->CreateBitCast(MI->getOperand(0), NewDstPtrTy); 19120adc9dc4650313f017b27d9818eb2176238113dMon P Wang Instruction *L = new LoadInst(Src, "tmp", MI->isVolatile(), SrcAlign); 192753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner InsertNewInstBefore(L, *MI); 19320adc9dc4650313f017b27d9818eb2176238113dMon P Wang InsertNewInstBefore(new StoreInst(L, Dest, MI->isVolatile(), DstAlign), 19420adc9dc4650313f017b27d9818eb2176238113dMon P Wang *MI); 195753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 196753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Set the size of the copy to 0, it will be deleted on the next iteration. 1974ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif MI->setOperand(2, Constant::getNullValue(MemOpLength->getType())); 198753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return MI; 199753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner} 200753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 201753a2b464d0628231bd3dce645edd05dfbaa3a06Chris LattnerInstruction *InstCombiner::SimplifyMemSet(MemSetInst *MI) { 202753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner unsigned Alignment = GetOrEnforceKnownAlignment(MI->getDest()); 203753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (MI->getAlignment() < Alignment) { 204753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner MI->setAlignment(ConstantInt::get(MI->getAlignmentType(), 205753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Alignment, false)); 206753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return MI; 207753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 2080c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 209753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Extract the length and alignment and fill if they are constant. 210753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner ConstantInt *LenC = dyn_cast<ConstantInt>(MI->getLength()); 211753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner ConstantInt *FillC = dyn_cast<ConstantInt>(MI->getValue()); 212b0bc6c361da9009e8414efde317d9bbff755f6c0Duncan Sands if (!LenC || !FillC || !FillC->getType()->isIntegerTy(8)) 213753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return 0; 214753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner uint64_t Len = LenC->getZExtValue(); 215753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Alignment = MI->getAlignment(); 2160c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 217753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // If the length is zero, this is a no-op 218753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (Len == 0) return MI; // memset(d,c,0,a) -> noop 2190c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 220753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // memset(s,c,n) -> store s, c (for n=1,2,4,8) 221753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (Len <= 8 && isPowerOf2_32((uint32_t)Len)) { 222753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner const Type *ITy = IntegerType::get(MI->getContext(), Len*8); // n=1 -> i8. 2230c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 224753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Value *Dest = MI->getDest(); 225753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Dest = Builder->CreateBitCast(Dest, PointerType::getUnqual(ITy)); 226753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 227753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Alignment 0 is identity for alignment 1 for memset, but not store. 228753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (Alignment == 0) Alignment = 1; 2290c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 230753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Extract the fill value and store. 231753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner uint64_t Fill = FillC->getZExtValue()*0x0101010101010101ULL; 232753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner InsertNewInstBefore(new StoreInst(ConstantInt::get(ITy, Fill), 233753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Dest, false, Alignment), *MI); 2340c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 235753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Set the size of the copy to 0, it will be deleted on the next iteration. 236753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner MI->setLength(Constant::getNullValue(LenC->getType())); 237753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return MI; 238753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 239753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 240753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return 0; 241753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner} 242753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 2430c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher/// visitCallInst - CallInst simplification. This mostly only handles folding 244753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner/// of intrinsic instructions. For normal calls, it allows visitCallSite to do 245753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner/// the heavy lifting. 246753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner/// 247753a2b464d0628231bd3dce645edd05dfbaa3a06Chris LattnerInstruction *InstCombiner::visitCallInst(CallInst &CI) { 248753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (isFreeCall(&CI)) 249753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return visitFree(CI); 250753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 251753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // If the caller function is nounwind, mark the call as nounwind, even if the 252753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // callee isn't. 253753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (CI.getParent()->getParent()->doesNotThrow() && 254753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner !CI.doesNotThrow()) { 255753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner CI.setDoesNotThrow(); 256753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return &CI; 257753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 2580c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 259753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner IntrinsicInst *II = dyn_cast<IntrinsicInst>(&CI); 260753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (!II) return visitCallSite(&CI); 2614ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif 262753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Intrinsics cannot occur in an invoke, so handle them here instead of in 263753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // visitCallSite. 264753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (MemIntrinsic *MI = dyn_cast<MemIntrinsic>(II)) { 265753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner bool Changed = false; 266753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 267753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // memmove/cpy/set of zero bytes is a noop. 268753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (Constant *NumBytes = dyn_cast<Constant>(MI->getLength())) { 269753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (NumBytes->isNullValue()) return EraseInstFromFunction(CI); 270753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 271753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (ConstantInt *CI = dyn_cast<ConstantInt>(NumBytes)) 272753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (CI->getZExtValue() == 1) { 273753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Replace the instruction with just byte operations. We would 274753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // transform other cases to loads/stores, but we don't know if 275753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // alignment is sufficient. 276753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 277753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 278753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 279753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // If we have a memmove and the source operation is a constant global, 280753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // then the source and dest pointers can't alias, so we can change this 281753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // into a call to memcpy. 282753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (MemMoveInst *MMI = dyn_cast<MemMoveInst>(MI)) { 283753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (GlobalVariable *GVSrc = dyn_cast<GlobalVariable>(MMI->getSource())) 284753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (GVSrc->isConstant()) { 2854ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif Module *M = MMI->getParent()->getParent()->getParent(); 286753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Intrinsic::ID MemCpyID = Intrinsic::memcpy; 2874ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif const Type *Tys[3] = { CI.getOperand(0)->getType(), 2884ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif CI.getOperand(1)->getType(), 2894ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif CI.getOperand(2)->getType() }; 2904ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif MMI->setCalledFunction( 29120adc9dc4650313f017b27d9818eb2176238113dMon P Wang Intrinsic::getDeclaration(M, MemCpyID, Tys, 3)); 292753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Changed = true; 293753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 294753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 295753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 296753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (MemTransferInst *MTI = dyn_cast<MemTransferInst>(MI)) { 297753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // memmove(x,x,size) -> noop. 298753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (MTI->getSource() == MTI->getDest()) 299753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return EraseInstFromFunction(CI); 300753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 3014ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif // If we can determine a pointer alignment that is bigger than currently 3024ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif // set, update the alignment. 3034ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif if (Instruction *I = SimplifyMemTransfer(MTI)) 304753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return I; 305753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } else if (MemSetInst *MSI = dyn_cast<MemSetInst>(MI)) { 306753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (Instruction *I = SimplifyMemSet(MSI)) 307753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return I; 308753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 3094ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif 310753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (Changed) return II; 311753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 3124ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif 313753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner switch (II->getIntrinsicID()) { 314753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner default: break; 315415326b4edcc967dfb03c5ab41923b195e7c3cb1Eric Christopher case Intrinsic::objectsize: { 31626d0e892e36e8dcc4248a8ccc8bedbd2d235eaeeEric Christopher // We need target data for just about everything so depend on it. 317415326b4edcc967dfb03c5ab41923b195e7c3cb1Eric Christopher if (!TD) break; 31826d0e892e36e8dcc4248a8ccc8bedbd2d235eaeeEric Christopher 319a862326bc72be147d9f668b84b9187258e690dc4Evan Cheng const Type *ReturnTy = CI.getType(); 3204ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif bool Min = (cast<ConstantInt>(II->getOperand(1))->getZExtValue() == 1); 321a862326bc72be147d9f668b84b9187258e690dc4Evan Cheng 32226d0e892e36e8dcc4248a8ccc8bedbd2d235eaeeEric Christopher // Get to the real allocated thing and offset as fast as possible. 3234ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif Value *Op1 = II->getOperand(0)->stripPointerCasts(); 324415326b4edcc967dfb03c5ab41923b195e7c3cb1Eric Christopher 32526d0e892e36e8dcc4248a8ccc8bedbd2d235eaeeEric Christopher // If we've stripped down to a single global variable that we 32626d0e892e36e8dcc4248a8ccc8bedbd2d235eaeeEric Christopher // can know the size of then just return that. 327415326b4edcc967dfb03c5ab41923b195e7c3cb1Eric Christopher if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Op1)) { 328415326b4edcc967dfb03c5ab41923b195e7c3cb1Eric Christopher if (GV->hasDefinitiveInitializer()) { 329415326b4edcc967dfb03c5ab41923b195e7c3cb1Eric Christopher Constant *C = GV->getInitializer(); 330a862326bc72be147d9f668b84b9187258e690dc4Evan Cheng uint64_t GlobalSize = TD->getTypeAllocSize(C->getType()); 331a862326bc72be147d9f668b84b9187258e690dc4Evan Cheng return ReplaceInstUsesWith(CI, ConstantInt::get(ReturnTy, GlobalSize)); 332415326b4edcc967dfb03c5ab41923b195e7c3cb1Eric Christopher } else { 333a862326bc72be147d9f668b84b9187258e690dc4Evan Cheng // Can't determine size of the GV. 334415326b4edcc967dfb03c5ab41923b195e7c3cb1Eric Christopher Constant *RetVal = ConstantInt::get(ReturnTy, Min ? 0 : -1ULL); 335415326b4edcc967dfb03c5ab41923b195e7c3cb1Eric Christopher return ReplaceInstUsesWith(CI, RetVal); 336415326b4edcc967dfb03c5ab41923b195e7c3cb1Eric Christopher } 337a862326bc72be147d9f668b84b9187258e690dc4Evan Cheng } else if (AllocaInst *AI = dyn_cast<AllocaInst>(Op1)) { 338a862326bc72be147d9f668b84b9187258e690dc4Evan Cheng // Get alloca size. 339a862326bc72be147d9f668b84b9187258e690dc4Evan Cheng if (AI->getAllocatedType()->isSized()) { 340a862326bc72be147d9f668b84b9187258e690dc4Evan Cheng uint64_t AllocaSize = TD->getTypeAllocSize(AI->getAllocatedType()); 341a862326bc72be147d9f668b84b9187258e690dc4Evan Cheng if (AI->isArrayAllocation()) { 342a862326bc72be147d9f668b84b9187258e690dc4Evan Cheng const ConstantInt *C = dyn_cast<ConstantInt>(AI->getArraySize()); 343a862326bc72be147d9f668b84b9187258e690dc4Evan Cheng if (!C) break; 344a862326bc72be147d9f668b84b9187258e690dc4Evan Cheng AllocaSize *= C->getZExtValue(); 345a862326bc72be147d9f668b84b9187258e690dc4Evan Cheng } 346a862326bc72be147d9f668b84b9187258e690dc4Evan Cheng return ReplaceInstUsesWith(CI, ConstantInt::get(ReturnTy, AllocaSize)); 347a862326bc72be147d9f668b84b9187258e690dc4Evan Cheng } 348687fed3530366b03a9a6433df0c032247ab17d5bEvan Cheng } else if (CallInst *MI = extractMallocCall(Op1)) { 349687fed3530366b03a9a6433df0c032247ab17d5bEvan Cheng const Type* MallocType = getMallocAllocatedType(MI); 350687fed3530366b03a9a6433df0c032247ab17d5bEvan Cheng // Get alloca size. 351687fed3530366b03a9a6433df0c032247ab17d5bEvan Cheng if (MallocType && MallocType->isSized()) { 352687fed3530366b03a9a6433df0c032247ab17d5bEvan Cheng if (Value *NElems = getMallocArraySize(MI, TD, true)) { 353687fed3530366b03a9a6433df0c032247ab17d5bEvan Cheng if (ConstantInt *NElements = dyn_cast<ConstantInt>(NElems)) 354687fed3530366b03a9a6433df0c032247ab17d5bEvan Cheng return ReplaceInstUsesWith(CI, ConstantInt::get(ReturnTy, 355687fed3530366b03a9a6433df0c032247ab17d5bEvan Cheng (NElements->getZExtValue() * TD->getTypeAllocSize(MallocType)))); 356687fed3530366b03a9a6433df0c032247ab17d5bEvan Cheng } 357687fed3530366b03a9a6433df0c032247ab17d5bEvan Cheng } 358a862326bc72be147d9f668b84b9187258e690dc4Evan Cheng } else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Op1)) { 35926d0e892e36e8dcc4248a8ccc8bedbd2d235eaeeEric Christopher // Only handle constant GEPs here. 36026d0e892e36e8dcc4248a8ccc8bedbd2d235eaeeEric Christopher if (CE->getOpcode() != Instruction::GetElementPtr) break; 36126d0e892e36e8dcc4248a8ccc8bedbd2d235eaeeEric Christopher GEPOperator *GEP = cast<GEPOperator>(CE); 36226d0e892e36e8dcc4248a8ccc8bedbd2d235eaeeEric Christopher 363dfdddd8ed621a44ec3da0e2fff42abf9e60e812aEric Christopher // Make sure we're not a constant offset from an external 364dfdddd8ed621a44ec3da0e2fff42abf9e60e812aEric Christopher // global. 365dfdddd8ed621a44ec3da0e2fff42abf9e60e812aEric Christopher Value *Operand = GEP->getPointerOperand(); 36677ffe3b31e32fbbcb06e71c8a68129df6266a492Eric Christopher Operand = Operand->stripPointerCasts(); 367dfdddd8ed621a44ec3da0e2fff42abf9e60e812aEric Christopher if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Operand)) 368dfdddd8ed621a44ec3da0e2fff42abf9e60e812aEric Christopher if (!GV->hasDefinitiveInitializer()) break; 36927ceaa13f820e33c44e29adc2095dd3e1e69d09fEric Christopher 37077ffe3b31e32fbbcb06e71c8a68129df6266a492Eric Christopher // Get what we're pointing to and its size. 37177ffe3b31e32fbbcb06e71c8a68129df6266a492Eric Christopher const PointerType *BaseType = 372dfdddd8ed621a44ec3da0e2fff42abf9e60e812aEric Christopher cast<PointerType>(Operand->getType()); 3736e5dfd4bf5205d5f84d958c9636bc0f57c23b96aEvan Cheng uint64_t Size = TD->getTypeAllocSize(BaseType->getElementType()); 37426d0e892e36e8dcc4248a8ccc8bedbd2d235eaeeEric Christopher 37577ffe3b31e32fbbcb06e71c8a68129df6266a492Eric Christopher // Get the current byte offset into the thing. Use the original 37677ffe3b31e32fbbcb06e71c8a68129df6266a492Eric Christopher // operand in case we're looking through a bitcast. 37726d0e892e36e8dcc4248a8ccc8bedbd2d235eaeeEric Christopher SmallVector<Value*, 8> Ops(CE->op_begin()+1, CE->op_end()); 37877ffe3b31e32fbbcb06e71c8a68129df6266a492Eric Christopher const PointerType *OffsetType = 37977ffe3b31e32fbbcb06e71c8a68129df6266a492Eric Christopher cast<PointerType>(GEP->getPointerOperand()->getType()); 3806e5dfd4bf5205d5f84d958c9636bc0f57c23b96aEvan Cheng uint64_t Offset = TD->getIndexedOffset(OffsetType, &Ops[0], Ops.size()); 38126d0e892e36e8dcc4248a8ccc8bedbd2d235eaeeEric Christopher 3826e5dfd4bf5205d5f84d958c9636bc0f57c23b96aEvan Cheng if (Size < Offset) { 3836e5dfd4bf5205d5f84d958c9636bc0f57c23b96aEvan Cheng // Out of bound reference? Negative index normalized to large 3846e5dfd4bf5205d5f84d958c9636bc0f57c23b96aEvan Cheng // index? Just return "I don't know". 3856e5dfd4bf5205d5f84d958c9636bc0f57c23b96aEvan Cheng Constant *RetVal = ConstantInt::get(ReturnTy, Min ? 0 : -1ULL); 3866e5dfd4bf5205d5f84d958c9636bc0f57c23b96aEvan Cheng return ReplaceInstUsesWith(CI, RetVal); 3876e5dfd4bf5205d5f84d958c9636bc0f57c23b96aEvan Cheng } 38826d0e892e36e8dcc4248a8ccc8bedbd2d235eaeeEric Christopher 38926d0e892e36e8dcc4248a8ccc8bedbd2d235eaeeEric Christopher Constant *RetVal = ConstantInt::get(ReturnTy, Size-Offset); 39026d0e892e36e8dcc4248a8ccc8bedbd2d235eaeeEric Christopher return ReplaceInstUsesWith(CI, RetVal); 39127ceaa13f820e33c44e29adc2095dd3e1e69d09fEric Christopher } 392a862326bc72be147d9f668b84b9187258e690dc4Evan Cheng 393a862326bc72be147d9f668b84b9187258e690dc4Evan Cheng // Do not return "I don't know" here. Later optimization passes could 394a862326bc72be147d9f668b84b9187258e690dc4Evan Cheng // make it possible to evaluate objectsize to a constant. 395f79d6246e6b6a83e31a1360e80f828707a51f98eEvan Cheng break; 396415326b4edcc967dfb03c5ab41923b195e7c3cb1Eric Christopher } 397753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner case Intrinsic::bswap: 398753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // bswap(bswap(x)) -> x 3994ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif if (IntrinsicInst *Operand = dyn_cast<IntrinsicInst>(II->getOperand(0))) 400753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (Operand->getIntrinsicID() == Intrinsic::bswap) 4014ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif return ReplaceInstUsesWith(CI, Operand->getOperand(0)); 4020c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 403753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // bswap(trunc(bswap(x))) -> trunc(lshr(x, c)) 4044ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif if (TruncInst *TI = dyn_cast<TruncInst>(II->getOperand(0))) { 405753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (IntrinsicInst *Operand = dyn_cast<IntrinsicInst>(TI->getOperand(0))) 406753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (Operand->getIntrinsicID() == Intrinsic::bswap) { 407753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner unsigned C = Operand->getType()->getPrimitiveSizeInBits() - 408753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner TI->getType()->getPrimitiveSizeInBits(); 409753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Value *CV = ConstantInt::get(Operand->getType(), C); 4104ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif Value *V = Builder->CreateLShr(Operand->getOperand(0), CV); 411753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return new TruncInst(V, TI->getType()); 412753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 413753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 4140c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 415753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner break; 416753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner case Intrinsic::powi: 4174ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif if (ConstantInt *Power = dyn_cast<ConstantInt>(II->getOperand(1))) { 418753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // powi(x, 0) -> 1.0 419753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (Power->isZero()) 420753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return ReplaceInstUsesWith(CI, ConstantFP::get(CI.getType(), 1.0)); 421753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // powi(x, 1) -> x 422753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (Power->isOne()) 4234ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif return ReplaceInstUsesWith(CI, II->getOperand(0)); 424753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // powi(x, -1) -> 1/x 425753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (Power->isAllOnesValue()) 426753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return BinaryOperator::CreateFDiv(ConstantFP::get(CI.getType(), 1.0), 4274ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif II->getOperand(0)); 428753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 429753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner break; 430753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner case Intrinsic::cttz: { 431753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // If all bits below the first known one are known zero, 432753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // this value is constant. 4334ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif const IntegerType *IT = cast<IntegerType>(II->getOperand(0)->getType()); 434753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner uint32_t BitWidth = IT->getBitWidth(); 435753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner APInt KnownZero(BitWidth, 0); 436753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner APInt KnownOne(BitWidth, 0); 4374ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif ComputeMaskedBits(II->getOperand(0), APInt::getAllOnesValue(BitWidth), 438753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner KnownZero, KnownOne); 439753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner unsigned TrailingZeros = KnownOne.countTrailingZeros(); 440753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner APInt Mask(APInt::getLowBitsSet(BitWidth, TrailingZeros)); 441753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if ((Mask & KnownZero) == Mask) 442753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return ReplaceInstUsesWith(CI, ConstantInt::get(IT, 443753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner APInt(BitWidth, TrailingZeros))); 4440c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 445753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 446753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner break; 447753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner case Intrinsic::ctlz: { 448753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // If all bits above the first known one are known zero, 449753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // this value is constant. 4504ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif const IntegerType *IT = cast<IntegerType>(II->getOperand(0)->getType()); 451753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner uint32_t BitWidth = IT->getBitWidth(); 452753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner APInt KnownZero(BitWidth, 0); 453753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner APInt KnownOne(BitWidth, 0); 4544ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif ComputeMaskedBits(II->getOperand(0), APInt::getAllOnesValue(BitWidth), 455753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner KnownZero, KnownOne); 456753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner unsigned LeadingZeros = KnownOne.countLeadingZeros(); 457753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner APInt Mask(APInt::getHighBitsSet(BitWidth, LeadingZeros)); 458753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if ((Mask & KnownZero) == Mask) 459753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return ReplaceInstUsesWith(CI, ConstantInt::get(IT, 460753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner APInt(BitWidth, LeadingZeros))); 4610c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 462753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 463753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner break; 464753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner case Intrinsic::uadd_with_overflow: { 4654ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif Value *LHS = II->getOperand(0), *RHS = II->getOperand(1); 4664ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif const IntegerType *IT = cast<IntegerType>(II->getOperand(0)->getType()); 467753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner uint32_t BitWidth = IT->getBitWidth(); 468753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner APInt Mask = APInt::getSignBit(BitWidth); 469753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner APInt LHSKnownZero(BitWidth, 0); 470753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner APInt LHSKnownOne(BitWidth, 0); 471753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner ComputeMaskedBits(LHS, Mask, LHSKnownZero, LHSKnownOne); 472753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner bool LHSKnownNegative = LHSKnownOne[BitWidth - 1]; 473753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner bool LHSKnownPositive = LHSKnownZero[BitWidth - 1]; 474753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 475753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (LHSKnownNegative || LHSKnownPositive) { 476753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner APInt RHSKnownZero(BitWidth, 0); 477753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner APInt RHSKnownOne(BitWidth, 0); 478753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner ComputeMaskedBits(RHS, Mask, RHSKnownZero, RHSKnownOne); 479753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner bool RHSKnownNegative = RHSKnownOne[BitWidth - 1]; 480753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner bool RHSKnownPositive = RHSKnownZero[BitWidth - 1]; 481753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (LHSKnownNegative && RHSKnownNegative) { 482753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // The sign bit is set in both cases: this MUST overflow. 483753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Create a simple add instruction, and insert it into the struct. 484753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Instruction *Add = BinaryOperator::CreateAdd(LHS, RHS, "", &CI); 485753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Worklist.Add(Add); 486753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Constant *V[] = { 487753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner UndefValue::get(LHS->getType()),ConstantInt::getTrue(II->getContext()) 488753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner }; 489753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Constant *Struct = ConstantStruct::get(II->getContext(), V, 2, false); 490753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return InsertValueInst::Create(Struct, Add, 0); 491753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 4920c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 493753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (LHSKnownPositive && RHSKnownPositive) { 494753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // The sign bit is clear in both cases: this CANNOT overflow. 495753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Create a simple add instruction, and insert it into the struct. 496753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Instruction *Add = BinaryOperator::CreateNUWAdd(LHS, RHS, "", &CI); 497753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Worklist.Add(Add); 498753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Constant *V[] = { 499753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner UndefValue::get(LHS->getType()), 500753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner ConstantInt::getFalse(II->getContext()) 501753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner }; 502753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Constant *Struct = ConstantStruct::get(II->getContext(), V, 2, false); 503753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return InsertValueInst::Create(Struct, Add, 0); 504753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 505753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 506753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 507753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // FALL THROUGH uadd into sadd 508753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner case Intrinsic::sadd_with_overflow: 509753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Canonicalize constants into the RHS. 5104ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif if (isa<Constant>(II->getOperand(0)) && 5114ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif !isa<Constant>(II->getOperand(1))) { 5124ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif Value *LHS = II->getOperand(0); 5134ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif II->setOperand(0, II->getOperand(1)); 5144ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif II->setOperand(1, LHS); 515753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return II; 516753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 517753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 518753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // X + undef -> undef 5194ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif if (isa<UndefValue>(II->getOperand(1))) 520753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return ReplaceInstUsesWith(CI, UndefValue::get(II->getType())); 5210c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 5224ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif if (ConstantInt *RHS = dyn_cast<ConstantInt>(II->getOperand(1))) { 523753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // X + 0 -> {X, false} 524753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (RHS->isZero()) { 525753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Constant *V[] = { 526753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner UndefValue::get(II->getOperand(0)->getType()), 527753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner ConstantInt::getFalse(II->getContext()) 528753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner }; 529753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Constant *Struct = ConstantStruct::get(II->getContext(), V, 2, false); 5304ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif return InsertValueInst::Create(Struct, II->getOperand(0), 0); 531753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 532753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 533753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner break; 534753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner case Intrinsic::usub_with_overflow: 535753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner case Intrinsic::ssub_with_overflow: 536753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // undef - X -> undef 537753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // X - undef -> undef 5384ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif if (isa<UndefValue>(II->getOperand(0)) || 5394ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif isa<UndefValue>(II->getOperand(1))) 540753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return ReplaceInstUsesWith(CI, UndefValue::get(II->getType())); 5410c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 5424ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif if (ConstantInt *RHS = dyn_cast<ConstantInt>(II->getOperand(1))) { 543753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // X - 0 -> {X, false} 544753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (RHS->isZero()) { 545753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Constant *V[] = { 5464ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif UndefValue::get(II->getOperand(0)->getType()), 547753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner ConstantInt::getFalse(II->getContext()) 548753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner }; 549753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Constant *Struct = ConstantStruct::get(II->getContext(), V, 2, false); 5504ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif return InsertValueInst::Create(Struct, II->getOperand(0), 0); 551753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 552753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 553753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner break; 554753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner case Intrinsic::umul_with_overflow: 555753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner case Intrinsic::smul_with_overflow: 556753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Canonicalize constants into the RHS. 5574ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif if (isa<Constant>(II->getOperand(0)) && 5584ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif !isa<Constant>(II->getOperand(1))) { 5594ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif Value *LHS = II->getOperand(0); 5604ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif II->setOperand(0, II->getOperand(1)); 5614ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif II->setOperand(1, LHS); 562753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return II; 563753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 564753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 565753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // X * undef -> undef 5664ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif if (isa<UndefValue>(II->getOperand(1))) 567753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return ReplaceInstUsesWith(CI, UndefValue::get(II->getType())); 5680c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 5694ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif if (ConstantInt *RHSI = dyn_cast<ConstantInt>(II->getOperand(1))) { 570753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // X*0 -> {0, false} 571753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (RHSI->isZero()) 572753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return ReplaceInstUsesWith(CI, Constant::getNullValue(II->getType())); 5730c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 574753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // X * 1 -> {X, false} 575753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (RHSI->equalsInt(1)) { 576753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Constant *V[] = { 5774ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif UndefValue::get(II->getOperand(0)->getType()), 578753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner ConstantInt::getFalse(II->getContext()) 579753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner }; 580753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Constant *Struct = ConstantStruct::get(II->getContext(), V, 2, false); 5814ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif return InsertValueInst::Create(Struct, II->getOperand(0), 0); 582753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 583753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 584753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner break; 585753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner case Intrinsic::ppc_altivec_lvx: 586753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner case Intrinsic::ppc_altivec_lvxl: 587753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner case Intrinsic::x86_sse_loadu_ps: 588753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner case Intrinsic::x86_sse2_loadu_pd: 589753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner case Intrinsic::x86_sse2_loadu_dq: 590753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Turn PPC lvx -> load if the pointer is known aligned. 591753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Turn X86 loadups -> load if the pointer is known aligned. 5924ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif if (GetOrEnforceKnownAlignment(II->getOperand(0), 16) >= 16) { 5934ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif Value *Ptr = Builder->CreateBitCast(II->getOperand(0), 594753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner PointerType::getUnqual(II->getType())); 595753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return new LoadInst(Ptr); 596753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 597753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner break; 598753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner case Intrinsic::ppc_altivec_stvx: 599753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner case Intrinsic::ppc_altivec_stvxl: 600753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Turn stvx -> store if the pointer is known aligned. 6014ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif if (GetOrEnforceKnownAlignment(II->getOperand(1), 16) >= 16) { 6020c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher const Type *OpPtrTy = 6034ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif PointerType::getUnqual(II->getOperand(0)->getType()); 6044ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif Value *Ptr = Builder->CreateBitCast(II->getOperand(1), OpPtrTy); 6054ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif return new StoreInst(II->getOperand(0), Ptr); 606753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 607753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner break; 608753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner case Intrinsic::x86_sse_storeu_ps: 609753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner case Intrinsic::x86_sse2_storeu_pd: 610753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner case Intrinsic::x86_sse2_storeu_dq: 611753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Turn X86 storeu -> store if the pointer is known aligned. 6124ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif if (GetOrEnforceKnownAlignment(II->getOperand(0), 16) >= 16) { 6130c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher const Type *OpPtrTy = 6144ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif PointerType::getUnqual(II->getOperand(1)->getType()); 6154ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif Value *Ptr = Builder->CreateBitCast(II->getOperand(0), OpPtrTy); 6164ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif return new StoreInst(II->getOperand(1), Ptr); 617753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 618753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner break; 6190c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 620753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner case Intrinsic::x86_sse_cvttss2si: { 621753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // These intrinsics only demands the 0th element of its input vector. If 622753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // we can simplify the input based on that, do so now. 623753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner unsigned VWidth = 6244ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif cast<VectorType>(II->getOperand(0)->getType())->getNumElements(); 625753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner APInt DemandedElts(VWidth, 1); 626753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner APInt UndefElts(VWidth, 0); 6274ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif if (Value *V = SimplifyDemandedVectorElts(II->getOperand(0), DemandedElts, 628753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner UndefElts)) { 6294ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif II->setOperand(0, V); 630753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return II; 631753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 632753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner break; 633753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 6340c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 635753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner case Intrinsic::ppc_altivec_vperm: 636753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Turn vperm(V1,V2,mask) -> shuffle(V1,V2,mask) if mask is a constant. 6374ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif if (ConstantVector *Mask = dyn_cast<ConstantVector>(II->getOperand(2))) { 638753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner assert(Mask->getNumOperands() == 16 && "Bad type for intrinsic!"); 6390c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 640753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Check that all of the elements are integer constants or undefs. 641753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner bool AllEltsOk = true; 642753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner for (unsigned i = 0; i != 16; ++i) { 6430c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher if (!isa<ConstantInt>(Mask->getOperand(i)) && 644753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner !isa<UndefValue>(Mask->getOperand(i))) { 645753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner AllEltsOk = false; 646753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner break; 647753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 648753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 6490c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 650753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (AllEltsOk) { 651753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Cast the input vectors to byte vectors. 6524ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif Value *Op0 = Builder->CreateBitCast(II->getOperand(0), Mask->getType()); 6534ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif Value *Op1 = Builder->CreateBitCast(II->getOperand(1), Mask->getType()); 654753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Value *Result = UndefValue::get(Op0->getType()); 6550c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 656753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Only extract each element once. 657753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Value *ExtractedElts[32]; 658753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner memset(ExtractedElts, 0, sizeof(ExtractedElts)); 6590c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 660753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner for (unsigned i = 0; i != 16; ++i) { 661753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (isa<UndefValue>(Mask->getOperand(i))) 662753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner continue; 663753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner unsigned Idx=cast<ConstantInt>(Mask->getOperand(i))->getZExtValue(); 664753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Idx &= 31; // Match the hardware behavior. 6650c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 666753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (ExtractedElts[Idx] == 0) { 6670c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher ExtractedElts[Idx] = 6680c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher Builder->CreateExtractElement(Idx < 16 ? Op0 : Op1, 669753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner ConstantInt::get(Type::getInt32Ty(II->getContext()), 670753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Idx&15, false), "tmp"); 671753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 6720c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 673753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Insert this value into the result vector. 674753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Result = Builder->CreateInsertElement(Result, ExtractedElts[Idx], 675753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner ConstantInt::get(Type::getInt32Ty(II->getContext()), 676753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner i, false), "tmp"); 677753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 678753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return CastInst::Create(Instruction::BitCast, Result, CI.getType()); 679753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 680753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 681753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner break; 682753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 683753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner case Intrinsic::stackrestore: { 684753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // If the save is right next to the restore, remove the restore. This can 685753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // happen when variable allocas are DCE'd. 6864ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif if (IntrinsicInst *SS = dyn_cast<IntrinsicInst>(II->getOperand(0))) { 687753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (SS->getIntrinsicID() == Intrinsic::stacksave) { 688753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner BasicBlock::iterator BI = SS; 689753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (&*++BI == II) 690753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return EraseInstFromFunction(CI); 691753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 692753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 6930c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 694753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Scan down this block to see if there is another stack restore in the 695753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // same block without an intervening call/alloca. 696753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner BasicBlock::iterator BI = II; 697753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner TerminatorInst *TI = II->getParent()->getTerminator(); 698753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner bool CannotRemove = false; 699753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner for (++BI; &*BI != TI; ++BI) { 700753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (isa<AllocaInst>(BI) || isMalloc(BI)) { 701753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner CannotRemove = true; 702753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner break; 703753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 704753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (CallInst *BCI = dyn_cast<CallInst>(BI)) { 705753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(BCI)) { 706753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // If there is a stackrestore below this one, remove this one. 707753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (II->getIntrinsicID() == Intrinsic::stackrestore) 708753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return EraseInstFromFunction(CI); 709753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Otherwise, ignore the intrinsic. 710753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } else { 711753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // If we found a non-intrinsic call, we can't remove the stack 712753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // restore. 713753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner CannotRemove = true; 714753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner break; 715753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 716753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 717753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 7180c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 719753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // If the stack restore is in a return/unwind block and if there are no 720753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // allocas or calls between the restore and the return, nuke the restore. 721753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (!CannotRemove && (isa<ReturnInst>(TI) || isa<UnwindInst>(TI))) 722753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return EraseInstFromFunction(CI); 723753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner break; 724753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 725753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 726753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 727753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return visitCallSite(II); 728753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner} 729753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 730753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner// InvokeInst simplification 731753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner// 732753a2b464d0628231bd3dce645edd05dfbaa3a06Chris LattnerInstruction *InstCombiner::visitInvokeInst(InvokeInst &II) { 733753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return visitCallSite(&II); 734753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner} 735753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 7360c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher/// isSafeToEliminateVarargsCast - If this cast does not affect the value 737753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner/// passed through the varargs area, we can eliminate the use of the cast. 738753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattnerstatic bool isSafeToEliminateVarargsCast(const CallSite CS, 739753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner const CastInst * const CI, 740753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner const TargetData * const TD, 741753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner const int ix) { 742753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (!CI->isLosslessCast()) 743753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return false; 744753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 745753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // The size of ByVal arguments is derived from the type, so we 746753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // can't change to a type with a different size. If the size were 747753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // passed explicitly we could avoid this check. 748753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (!CS.paramHasAttr(ix, Attribute::ByVal)) 749753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return true; 750753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 7510c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher const Type* SrcTy = 752753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner cast<PointerType>(CI->getOperand(0)->getType())->getElementType(); 753753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner const Type* DstTy = cast<PointerType>(CI->getType())->getElementType(); 754753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (!SrcTy->isSized() || !DstTy->isSized()) 755753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return false; 756753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (!TD || TD->getTypeAllocSize(SrcTy) != TD->getTypeAllocSize(DstTy)) 757753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return false; 758753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return true; 759753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner} 760753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 7610b6cb507385c8bd10b6a51b5e45a9b99d8d94798Benjamin Kramernamespace { 7620b6cb507385c8bd10b6a51b5e45a9b99d8d94798Benjamin Kramerclass InstCombineFortifiedLibCalls : public SimplifyFortifiedLibCalls { 7630b6cb507385c8bd10b6a51b5e45a9b99d8d94798Benjamin Kramer InstCombiner *IC; 7640b6cb507385c8bd10b6a51b5e45a9b99d8d94798Benjamin Kramerprotected: 7650b6cb507385c8bd10b6a51b5e45a9b99d8d94798Benjamin Kramer void replaceCall(Value *With) { 7660b6cb507385c8bd10b6a51b5e45a9b99d8d94798Benjamin Kramer NewInstruction = IC->ReplaceInstUsesWith(*CI, With); 7670b6cb507385c8bd10b6a51b5e45a9b99d8d94798Benjamin Kramer } 7680b6cb507385c8bd10b6a51b5e45a9b99d8d94798Benjamin Kramer bool isFoldable(unsigned SizeCIOp, unsigned SizeArgOp, bool isString) const { 7690b6cb507385c8bd10b6a51b5e45a9b99d8d94798Benjamin Kramer if (ConstantInt *SizeCI = dyn_cast<ConstantInt>(CI->getOperand(SizeCIOp))) { 7700b6cb507385c8bd10b6a51b5e45a9b99d8d94798Benjamin Kramer if (SizeCI->isAllOnesValue()) 7710b6cb507385c8bd10b6a51b5e45a9b99d8d94798Benjamin Kramer return true; 7720b6cb507385c8bd10b6a51b5e45a9b99d8d94798Benjamin Kramer if (isString) 7730b6cb507385c8bd10b6a51b5e45a9b99d8d94798Benjamin Kramer return SizeCI->getZExtValue() >= 7740b6cb507385c8bd10b6a51b5e45a9b99d8d94798Benjamin Kramer GetStringLength(CI->getOperand(SizeArgOp)); 7750b6cb507385c8bd10b6a51b5e45a9b99d8d94798Benjamin Kramer if (ConstantInt *Arg = dyn_cast<ConstantInt>(CI->getOperand(SizeArgOp))) 7769d8f002d8f5a5aba665bb6f85c19eee77810043cEvan Cheng return SizeCI->getZExtValue() >= Arg->getZExtValue(); 7770b6cb507385c8bd10b6a51b5e45a9b99d8d94798Benjamin Kramer } 7780b6cb507385c8bd10b6a51b5e45a9b99d8d94798Benjamin Kramer return false; 7790b6cb507385c8bd10b6a51b5e45a9b99d8d94798Benjamin Kramer } 7800b6cb507385c8bd10b6a51b5e45a9b99d8d94798Benjamin Kramerpublic: 7810b6cb507385c8bd10b6a51b5e45a9b99d8d94798Benjamin Kramer InstCombineFortifiedLibCalls(InstCombiner *IC) : IC(IC), NewInstruction(0) { } 7820b6cb507385c8bd10b6a51b5e45a9b99d8d94798Benjamin Kramer Instruction *NewInstruction; 7830b6cb507385c8bd10b6a51b5e45a9b99d8d94798Benjamin Kramer}; 7840b6cb507385c8bd10b6a51b5e45a9b99d8d94798Benjamin Kramer} // end anonymous namespace 7850b6cb507385c8bd10b6a51b5e45a9b99d8d94798Benjamin Kramer 78627ceaa13f820e33c44e29adc2095dd3e1e69d09fEric Christopher// Try to fold some different type of calls here. 78727ceaa13f820e33c44e29adc2095dd3e1e69d09fEric Christopher// Currently we're only working with the checking functions, memcpy_chk, 78827ceaa13f820e33c44e29adc2095dd3e1e69d09fEric Christopher// mempcpy_chk, memmove_chk, memset_chk, strcpy_chk, stpcpy_chk, strncpy_chk, 78927ceaa13f820e33c44e29adc2095dd3e1e69d09fEric Christopher// strcat_chk and strncat_chk. 79027ceaa13f820e33c44e29adc2095dd3e1e69d09fEric ChristopherInstruction *InstCombiner::tryOptimizeCall(CallInst *CI, const TargetData *TD) { 79127ceaa13f820e33c44e29adc2095dd3e1e69d09fEric Christopher if (CI->getCalledFunction() == 0) return 0; 79227ceaa13f820e33c44e29adc2095dd3e1e69d09fEric Christopher 7930b6cb507385c8bd10b6a51b5e45a9b99d8d94798Benjamin Kramer InstCombineFortifiedLibCalls Simplifier(this); 7940b6cb507385c8bd10b6a51b5e45a9b99d8d94798Benjamin Kramer Simplifier.fold(CI, TD); 7950b6cb507385c8bd10b6a51b5e45a9b99d8d94798Benjamin Kramer return Simplifier.NewInstruction; 79627ceaa13f820e33c44e29adc2095dd3e1e69d09fEric Christopher} 79727ceaa13f820e33c44e29adc2095dd3e1e69d09fEric Christopher 798753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner// visitCallSite - Improvements for call and invoke instructions. 799753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner// 800753a2b464d0628231bd3dce645edd05dfbaa3a06Chris LattnerInstruction *InstCombiner::visitCallSite(CallSite CS) { 801753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner bool Changed = false; 802753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 803753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // If the callee is a constexpr cast of a function, attempt to move the cast 804753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // to the arguments of the call/invoke. 805753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (transformConstExprCastCall(CS)) return 0; 806753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 807753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Value *Callee = CS.getCalledValue(); 808753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 809753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (Function *CalleeF = dyn_cast<Function>(Callee)) 810d569561835b0fa4dbbb0fca1b1f0a8de6c01439aChris Lattner // If the call and callee calling conventions don't match, this call must 811d569561835b0fa4dbbb0fca1b1f0a8de6c01439aChris Lattner // be unreachable, as the call is undefined. 812d569561835b0fa4dbbb0fca1b1f0a8de6c01439aChris Lattner if (CalleeF->getCallingConv() != CS.getCallingConv() && 813d569561835b0fa4dbbb0fca1b1f0a8de6c01439aChris Lattner // Only do this for calls to a function with a body. A prototype may 814d569561835b0fa4dbbb0fca1b1f0a8de6c01439aChris Lattner // not actually end up matching the implementation's calling conv for a 815d569561835b0fa4dbbb0fca1b1f0a8de6c01439aChris Lattner // variety of reasons (e.g. it may be written in assembly). 816d569561835b0fa4dbbb0fca1b1f0a8de6c01439aChris Lattner !CalleeF->isDeclaration()) { 817753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Instruction *OldCall = CS.getInstruction(); 818753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner new StoreInst(ConstantInt::getTrue(Callee->getContext()), 8190c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher UndefValue::get(Type::getInt1PtrTy(Callee->getContext())), 820753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner OldCall); 821753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // If OldCall dues not return void then replaceAllUsesWith undef. 822753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // This allows ValueHandlers and custom metadata to adjust itself. 823753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (!OldCall->getType()->isVoidTy()) 824753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner OldCall->replaceAllUsesWith(UndefValue::get(OldCall->getType())); 825830f3f205d8a77acbf8838fe78c2c733ca924d9cChris Lattner if (isa<CallInst>(OldCall)) 826753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return EraseInstFromFunction(*OldCall); 8270c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 828830f3f205d8a77acbf8838fe78c2c733ca924d9cChris Lattner // We cannot remove an invoke, because it would change the CFG, just 829830f3f205d8a77acbf8838fe78c2c733ca924d9cChris Lattner // change the callee to a null pointer. 830654c06f6457f80428e40810ad251c412462731e4Gabor Greif cast<InvokeInst>(OldCall)->setCalledFunction( 831830f3f205d8a77acbf8838fe78c2c733ca924d9cChris Lattner Constant::getNullValue(CalleeF->getType())); 832753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return 0; 833753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 834753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 835753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (isa<ConstantPointerNull>(Callee) || isa<UndefValue>(Callee)) { 836753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // This instruction is not reachable, just remove it. We insert a store to 837753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // undef so that we know that this code is not reachable, despite the fact 838753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // that we can't modify the CFG here. 839753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner new StoreInst(ConstantInt::getTrue(Callee->getContext()), 840753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner UndefValue::get(Type::getInt1PtrTy(Callee->getContext())), 841753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner CS.getInstruction()); 842753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 8434ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif // If CS does not return void then replaceAllUsesWith undef. 844753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // This allows ValueHandlers and custom metadata to adjust itself. 845753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (!CS.getInstruction()->getType()->isVoidTy()) 846753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner CS.getInstruction()-> 847753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner replaceAllUsesWith(UndefValue::get(CS.getInstruction()->getType())); 848753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 849753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (InvokeInst *II = dyn_cast<InvokeInst>(CS.getInstruction())) { 850753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Don't break the CFG, insert a dummy cond branch. 851753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner BranchInst::Create(II->getNormalDest(), II->getUnwindDest(), 852753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner ConstantInt::getTrue(Callee->getContext()), II); 853753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 854753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return EraseInstFromFunction(*CS.getInstruction()); 855753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 856753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 857753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (BitCastInst *BC = dyn_cast<BitCastInst>(Callee)) 858753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (IntrinsicInst *In = dyn_cast<IntrinsicInst>(BC->getOperand(0))) 859753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (In->getIntrinsicID() == Intrinsic::init_trampoline) 860753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return transformCallThroughTrampoline(CS); 861753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 862753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner const PointerType *PTy = cast<PointerType>(Callee->getType()); 863753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner const FunctionType *FTy = cast<FunctionType>(PTy->getElementType()); 864753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (FTy->isVarArg()) { 865753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner int ix = FTy->getNumParams() + (isa<InvokeInst>(Callee) ? 3 : 1); 866753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // See if we can optimize any arguments passed through the varargs area of 867753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // the call. 868753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner for (CallSite::arg_iterator I = CS.arg_begin()+FTy->getNumParams(), 869753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner E = CS.arg_end(); I != E; ++I, ++ix) { 870753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner CastInst *CI = dyn_cast<CastInst>(*I); 871753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (CI && isSafeToEliminateVarargsCast(CS, CI, TD, ix)) { 872753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner *I = CI->getOperand(0); 873753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Changed = true; 874753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 875753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 876753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 877753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 878753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (isa<InlineAsm>(Callee) && !CS.doesNotThrow()) { 879753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Inline asm calls cannot throw - mark them 'nounwind'. 880753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner CS.setDoesNotThrow(); 881753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Changed = true; 882753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 883753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 88427ceaa13f820e33c44e29adc2095dd3e1e69d09fEric Christopher // Try to optimize the call if possible, we require TargetData for most of 88527ceaa13f820e33c44e29adc2095dd3e1e69d09fEric Christopher // this. None of these calls are seen as possibly dead so go ahead and 88627ceaa13f820e33c44e29adc2095dd3e1e69d09fEric Christopher // delete the instruction now. 88727ceaa13f820e33c44e29adc2095dd3e1e69d09fEric Christopher if (CallInst *CI = dyn_cast<CallInst>(CS.getInstruction())) { 88827ceaa13f820e33c44e29adc2095dd3e1e69d09fEric Christopher Instruction *I = tryOptimizeCall(CI, TD); 8897b323a34fa034389e9e439f6c02eeb73e87ab9dbEric Christopher // If we changed something return the result, etc. Otherwise let 8907b323a34fa034389e9e439f6c02eeb73e87ab9dbEric Christopher // the fallthrough check. 8917b323a34fa034389e9e439f6c02eeb73e87ab9dbEric Christopher if (I) return EraseInstFromFunction(*I); 89227ceaa13f820e33c44e29adc2095dd3e1e69d09fEric Christopher } 89327ceaa13f820e33c44e29adc2095dd3e1e69d09fEric Christopher 894753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return Changed ? CS.getInstruction() : 0; 895753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner} 896753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 897753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner// transformConstExprCastCall - If the callee is a constexpr cast of a function, 898753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner// attempt to move the cast to the arguments of the call/invoke. 899753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner// 900753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattnerbool InstCombiner::transformConstExprCastCall(CallSite CS) { 901753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (!isa<ConstantExpr>(CS.getCalledValue())) return false; 902753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner ConstantExpr *CE = cast<ConstantExpr>(CS.getCalledValue()); 9030c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher if (CE->getOpcode() != Instruction::BitCast || 904753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner !isa<Function>(CE->getOperand(0))) 905753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return false; 906753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Function *Callee = cast<Function>(CE->getOperand(0)); 907753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Instruction *Caller = CS.getInstruction(); 908753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner const AttrListPtr &CallerPAL = CS.getAttributes(); 909753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 910753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Okay, this is a cast from a function to a different type. Unless doing so 911753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // would cause a type conversion of one of our arguments, change this call to 912753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // be a direct call with arguments casted to the appropriate types. 913753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // 914753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner const FunctionType *FT = Callee->getFunctionType(); 915753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner const Type *OldRetTy = Caller->getType(); 916753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner const Type *NewRetTy = FT->getReturnType(); 917753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 9181df9859c40492511b8aa4321eb76496005d3b75bDuncan Sands if (NewRetTy->isStructTy()) 919753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return false; // TODO: Handle multiple return values. 920753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 921753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Check to see if we are changing the return type... 922753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (OldRetTy != NewRetTy) { 923753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (Callee->isDeclaration() && 924753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Conversion is ok if changing from one pointer type to another or from 925753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // a pointer to an integer of the same size. 9261df9859c40492511b8aa4321eb76496005d3b75bDuncan Sands !((OldRetTy->isPointerTy() || !TD || 927753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner OldRetTy == TD->getIntPtrType(Caller->getContext())) && 9281df9859c40492511b8aa4321eb76496005d3b75bDuncan Sands (NewRetTy->isPointerTy() || !TD || 929753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner NewRetTy == TD->getIntPtrType(Caller->getContext())))) 930753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return false; // Cannot transform this return value. 931753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 932753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (!Caller->use_empty() && 933753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // void -> non-void is handled specially 934753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner !NewRetTy->isVoidTy() && !CastInst::isCastable(NewRetTy, OldRetTy)) 935753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return false; // Cannot transform this return value. 936753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 937753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (!CallerPAL.isEmpty() && !Caller->use_empty()) { 938753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Attributes RAttrs = CallerPAL.getRetAttributes(); 939753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (RAttrs & Attribute::typeIncompatible(NewRetTy)) 940753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return false; // Attribute not compatible with transformed value. 941753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 942753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 943753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // If the callsite is an invoke instruction, and the return value is used by 944753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // a PHI node in a successor, we cannot change the return type of the call 945753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // because there is no place to put the cast instruction (without breaking 946753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // the critical edge). Bail out in this case. 947753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (!Caller->use_empty()) 948753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (InvokeInst *II = dyn_cast<InvokeInst>(Caller)) 949753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner for (Value::use_iterator UI = II->use_begin(), E = II->use_end(); 950753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner UI != E; ++UI) 951753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (PHINode *PN = dyn_cast<PHINode>(*UI)) 952753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (PN->getParent() == II->getNormalDest() || 953753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner PN->getParent() == II->getUnwindDest()) 954753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return false; 955753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 956753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 957753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner unsigned NumActualArgs = unsigned(CS.arg_end()-CS.arg_begin()); 958753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner unsigned NumCommonArgs = std::min(FT->getNumParams(), NumActualArgs); 959753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 960753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner CallSite::arg_iterator AI = CS.arg_begin(); 961753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner for (unsigned i = 0, e = NumCommonArgs; i != e; ++i, ++AI) { 962753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner const Type *ParamTy = FT->getParamType(i); 963753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner const Type *ActTy = (*AI)->getType(); 964753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 965753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (!CastInst::isCastable(ActTy, ParamTy)) 966753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return false; // Cannot transform this parameter value. 967753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 9680c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher if (CallerPAL.getParamAttributes(i + 1) 969753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner & Attribute::typeIncompatible(ParamTy)) 970753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return false; // Attribute not compatible with transformed value. 971753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 972753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Converting from one pointer type to another or between a pointer and an 973753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // integer of the same size is safe even if we do not have a body. 974753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner bool isConvertible = ActTy == ParamTy || 9751df9859c40492511b8aa4321eb76496005d3b75bDuncan Sands (TD && ((ParamTy->isPointerTy() || 976753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner ParamTy == TD->getIntPtrType(Caller->getContext())) && 9771df9859c40492511b8aa4321eb76496005d3b75bDuncan Sands (ActTy->isPointerTy() || 978753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner ActTy == TD->getIntPtrType(Caller->getContext())))); 979753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (Callee->isDeclaration() && !isConvertible) return false; 980753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 981753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 982753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (FT->getNumParams() < NumActualArgs && !FT->isVarArg() && 983753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Callee->isDeclaration()) 984753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return false; // Do not delete arguments unless we have a function body. 985753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 986753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (FT->getNumParams() < NumActualArgs && FT->isVarArg() && 987753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner !CallerPAL.isEmpty()) 988753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // In this case we have more arguments than the new function type, but we 989753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // won't be dropping them. Check that these extra arguments have attributes 990753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // that are compatible with being a vararg call argument. 991753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner for (unsigned i = CallerPAL.getNumSlots(); i; --i) { 992753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (CallerPAL.getSlot(i - 1).Index <= FT->getNumParams()) 993753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner break; 994753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Attributes PAttrs = CallerPAL.getSlot(i - 1).Attrs; 995753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (PAttrs & Attribute::VarArgsIncompatible) 996753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return false; 997753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 998753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 999753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Okay, we decided that this is a safe thing to do: go ahead and start 1000753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // inserting cast instructions as necessary... 1001753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner std::vector<Value*> Args; 1002753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Args.reserve(NumActualArgs); 1003753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner SmallVector<AttributeWithIndex, 8> attrVec; 1004753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner attrVec.reserve(NumCommonArgs); 1005753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1006753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Get any return attributes. 1007753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Attributes RAttrs = CallerPAL.getRetAttributes(); 1008753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1009753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // If the return value is not being used, the type may not be compatible 1010753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // with the existing attributes. Wipe out any problematic attributes. 1011753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner RAttrs &= ~Attribute::typeIncompatible(NewRetTy); 1012753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1013753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Add the new return attributes. 1014753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (RAttrs) 1015753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner attrVec.push_back(AttributeWithIndex::get(0, RAttrs)); 1016753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1017753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner AI = CS.arg_begin(); 1018753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner for (unsigned i = 0; i != NumCommonArgs; ++i, ++AI) { 1019753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner const Type *ParamTy = FT->getParamType(i); 1020753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if ((*AI)->getType() == ParamTy) { 1021753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Args.push_back(*AI); 1022753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } else { 1023753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Instruction::CastOps opcode = CastInst::getCastOpcode(*AI, 1024753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner false, ParamTy, false); 1025753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Args.push_back(Builder->CreateCast(opcode, *AI, ParamTy, "tmp")); 1026753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 1027753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1028753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Add any parameter attributes. 1029753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (Attributes PAttrs = CallerPAL.getParamAttributes(i + 1)) 1030753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner attrVec.push_back(AttributeWithIndex::get(i + 1, PAttrs)); 1031753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 1032753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1033753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // If the function takes more arguments than the call was taking, add them 1034753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // now. 1035753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner for (unsigned i = NumCommonArgs; i != FT->getNumParams(); ++i) 1036753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Args.push_back(Constant::getNullValue(FT->getParamType(i))); 1037753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1038753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // If we are removing arguments to the function, emit an obnoxious warning. 1039753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (FT->getNumParams() < NumActualArgs) { 1040753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (!FT->isVarArg()) { 1041753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner errs() << "WARNING: While resolving call to function '" 1042753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner << Callee->getName() << "' arguments were dropped!\n"; 1043753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } else { 1044753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Add all of the arguments in their promoted form to the arg list. 1045753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner for (unsigned i = FT->getNumParams(); i != NumActualArgs; ++i, ++AI) { 1046753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner const Type *PTy = getPromotedType((*AI)->getType()); 1047753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (PTy != (*AI)->getType()) { 1048753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Must promote to pass through va_arg area! 1049753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Instruction::CastOps opcode = 1050753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner CastInst::getCastOpcode(*AI, false, PTy, false); 1051753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Args.push_back(Builder->CreateCast(opcode, *AI, PTy, "tmp")); 1052753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } else { 1053753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Args.push_back(*AI); 1054753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 1055753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1056753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Add any parameter attributes. 1057753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (Attributes PAttrs = CallerPAL.getParamAttributes(i + 1)) 1058753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner attrVec.push_back(AttributeWithIndex::get(i + 1, PAttrs)); 1059753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 1060753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 1061753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 1062753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1063753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (Attributes FnAttrs = CallerPAL.getFnAttributes()) 1064753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner attrVec.push_back(AttributeWithIndex::get(~0, FnAttrs)); 1065753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1066753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (NewRetTy->isVoidTy()) 1067753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Caller->setName(""); // Void type should not have a name. 1068753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1069753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner const AttrListPtr &NewCallerPAL = AttrListPtr::get(attrVec.begin(), 1070753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner attrVec.end()); 1071753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1072753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Instruction *NC; 1073753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (InvokeInst *II = dyn_cast<InvokeInst>(Caller)) { 1074753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner NC = InvokeInst::Create(Callee, II->getNormalDest(), II->getUnwindDest(), 1075753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Args.begin(), Args.end(), 1076753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Caller->getName(), Caller); 1077753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner cast<InvokeInst>(NC)->setCallingConv(II->getCallingConv()); 1078753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner cast<InvokeInst>(NC)->setAttributes(NewCallerPAL); 1079753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } else { 1080753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner NC = CallInst::Create(Callee, Args.begin(), Args.end(), 1081753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Caller->getName(), Caller); 1082753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner CallInst *CI = cast<CallInst>(Caller); 1083753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (CI->isTailCall()) 1084753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner cast<CallInst>(NC)->setTailCall(); 1085753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner cast<CallInst>(NC)->setCallingConv(CI->getCallingConv()); 1086753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner cast<CallInst>(NC)->setAttributes(NewCallerPAL); 1087753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 1088753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1089753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Insert a cast of the return type as necessary. 1090753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Value *NV = NC; 1091753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (OldRetTy != NV->getType() && !Caller->use_empty()) { 1092753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (!NV->getType()->isVoidTy()) { 10930c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher Instruction::CastOps opcode = CastInst::getCastOpcode(NC, false, 1094753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner OldRetTy, false); 1095753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner NV = NC = CastInst::Create(opcode, NC, OldRetTy, "tmp"); 1096753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1097753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // If this is an invoke instruction, we should insert it after the first 1098753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // non-phi, instruction in the normal successor block. 1099753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (InvokeInst *II = dyn_cast<InvokeInst>(Caller)) { 1100753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner BasicBlock::iterator I = II->getNormalDest()->getFirstNonPHI(); 1101753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner InsertNewInstBefore(NC, *I); 1102753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } else { 1103753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Otherwise, it's a call, just insert cast right after the call instr 1104753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner InsertNewInstBefore(NC, *Caller); 1105753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 1106753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Worklist.AddUsersToWorkList(*Caller); 1107753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } else { 1108753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner NV = UndefValue::get(Caller->getType()); 1109753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 1110753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 1111753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1112753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1113753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (!Caller->use_empty()) 1114753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Caller->replaceAllUsesWith(NV); 11150c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 1116753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner EraseInstFromFunction(*Caller); 1117753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return true; 1118753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner} 1119753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1120753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner// transformCallThroughTrampoline - Turn a call to a function created by the 1121753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner// init_trampoline intrinsic into a direct call to the underlying function. 1122753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner// 1123753a2b464d0628231bd3dce645edd05dfbaa3a06Chris LattnerInstruction *InstCombiner::transformCallThroughTrampoline(CallSite CS) { 1124753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Value *Callee = CS.getCalledValue(); 1125753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner const PointerType *PTy = cast<PointerType>(Callee->getType()); 1126753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner const FunctionType *FTy = cast<FunctionType>(PTy->getElementType()); 1127753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner const AttrListPtr &Attrs = CS.getAttributes(); 1128753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1129753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // If the call already has the 'nest' attribute somewhere then give up - 1130753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // otherwise 'nest' would occur twice after splicing in the chain. 1131753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (Attrs.hasAttrSomewhere(Attribute::Nest)) 1132753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return 0; 1133753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1134753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner IntrinsicInst *Tramp = 1135753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner cast<IntrinsicInst>(cast<BitCastInst>(Callee)->getOperand(0)); 1136753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 11374ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif Function *NestF = cast<Function>(Tramp->getOperand(1)->stripPointerCasts()); 1138753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner const PointerType *NestFPTy = cast<PointerType>(NestF->getType()); 1139753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner const FunctionType *NestFTy = cast<FunctionType>(NestFPTy->getElementType()); 1140753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1141753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner const AttrListPtr &NestAttrs = NestF->getAttributes(); 1142753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (!NestAttrs.isEmpty()) { 1143753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner unsigned NestIdx = 1; 1144753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner const Type *NestTy = 0; 1145753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Attributes NestAttr = Attribute::None; 1146753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1147753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Look for a parameter marked with the 'nest' attribute. 1148753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner for (FunctionType::param_iterator I = NestFTy->param_begin(), 1149753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner E = NestFTy->param_end(); I != E; ++NestIdx, ++I) 1150753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (NestAttrs.paramHasAttr(NestIdx, Attribute::Nest)) { 1151753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Record the parameter type and any other attributes. 1152753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner NestTy = *I; 1153753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner NestAttr = NestAttrs.getParamAttributes(NestIdx); 1154753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner break; 1155753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 1156753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1157753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (NestTy) { 1158753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Instruction *Caller = CS.getInstruction(); 1159753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner std::vector<Value*> NewArgs; 1160753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner NewArgs.reserve(unsigned(CS.arg_end()-CS.arg_begin())+1); 1161753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1162753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner SmallVector<AttributeWithIndex, 8> NewAttrs; 1163753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner NewAttrs.reserve(Attrs.getNumSlots() + 1); 1164753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1165753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Insert the nest argument into the call argument list, which may 1166753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // mean appending it. Likewise for attributes. 1167753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1168753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Add any result attributes. 1169753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (Attributes Attr = Attrs.getRetAttributes()) 1170753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner NewAttrs.push_back(AttributeWithIndex::get(0, Attr)); 1171753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1172753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner { 1173753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner unsigned Idx = 1; 1174753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner CallSite::arg_iterator I = CS.arg_begin(), E = CS.arg_end(); 1175753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner do { 1176753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (Idx == NestIdx) { 1177753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Add the chain argument and attributes. 11784ec2258ffb495d7ce00177e447740ef1123a27dbGabor Greif Value *NestVal = Tramp->getOperand(2); 1179753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (NestVal->getType() != NestTy) 1180753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner NestVal = new BitCastInst(NestVal, NestTy, "nest", Caller); 1181753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner NewArgs.push_back(NestVal); 1182753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner NewAttrs.push_back(AttributeWithIndex::get(NestIdx, NestAttr)); 1183753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 1184753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1185753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (I == E) 1186753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner break; 1187753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1188753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Add the original argument and attributes. 1189753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner NewArgs.push_back(*I); 1190753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (Attributes Attr = Attrs.getParamAttributes(Idx)) 1191753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner NewAttrs.push_back 1192753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner (AttributeWithIndex::get(Idx + (Idx >= NestIdx), Attr)); 1193753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1194753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner ++Idx, ++I; 1195753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } while (1); 1196753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 1197753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1198753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Add any function attributes. 1199753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (Attributes Attr = Attrs.getFnAttributes()) 1200753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner NewAttrs.push_back(AttributeWithIndex::get(~0, Attr)); 1201753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1202753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // The trampoline may have been bitcast to a bogus type (FTy). 1203753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Handle this by synthesizing a new function type, equal to FTy 1204753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // with the chain parameter inserted. 1205753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1206753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner std::vector<const Type*> NewTypes; 1207753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner NewTypes.reserve(FTy->getNumParams()+1); 1208753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1209753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Insert the chain's type into the list of parameter types, which may 1210753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // mean appending it. 1211753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner { 1212753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner unsigned Idx = 1; 1213753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner FunctionType::param_iterator I = FTy->param_begin(), 1214753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner E = FTy->param_end(); 1215753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1216753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner do { 1217753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (Idx == NestIdx) 1218753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Add the chain's type. 1219753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner NewTypes.push_back(NestTy); 1220753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1221753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (I == E) 1222753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner break; 1223753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1224753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Add the original type. 1225753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner NewTypes.push_back(*I); 1226753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1227753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner ++Idx, ++I; 1228753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } while (1); 1229753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 1230753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1231753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Replace the trampoline call with a direct call. Let the generic 1232753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // code sort out any function type mismatches. 12330c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher FunctionType *NewFTy = FunctionType::get(FTy->getReturnType(), NewTypes, 1234753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner FTy->isVarArg()); 1235753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Constant *NewCallee = 1236753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner NestF->getType() == PointerType::getUnqual(NewFTy) ? 12370c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher NestF : ConstantExpr::getBitCast(NestF, 1238753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner PointerType::getUnqual(NewFTy)); 1239753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner const AttrListPtr &NewPAL = AttrListPtr::get(NewAttrs.begin(), 1240753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner NewAttrs.end()); 1241753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1242753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Instruction *NewCaller; 1243753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (InvokeInst *II = dyn_cast<InvokeInst>(Caller)) { 1244753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner NewCaller = InvokeInst::Create(NewCallee, 1245753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner II->getNormalDest(), II->getUnwindDest(), 1246753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner NewArgs.begin(), NewArgs.end(), 1247753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Caller->getName(), Caller); 1248753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner cast<InvokeInst>(NewCaller)->setCallingConv(II->getCallingConv()); 1249753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner cast<InvokeInst>(NewCaller)->setAttributes(NewPAL); 1250753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } else { 1251753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner NewCaller = CallInst::Create(NewCallee, NewArgs.begin(), NewArgs.end(), 1252753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Caller->getName(), Caller); 1253753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (cast<CallInst>(Caller)->isTailCall()) 1254753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner cast<CallInst>(NewCaller)->setTailCall(); 1255753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner cast<CallInst>(NewCaller)-> 1256753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner setCallingConv(cast<CallInst>(Caller)->getCallingConv()); 1257753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner cast<CallInst>(NewCaller)->setAttributes(NewPAL); 1258753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 1259753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner if (!Caller->getType()->isVoidTy()) 1260753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Caller->replaceAllUsesWith(NewCaller); 1261753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Caller->eraseFromParent(); 1262753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Worklist.Remove(Caller); 1263753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return 0; 1264753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 1265753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner } 1266753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner 1267753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // Replace the trampoline call with a direct call. Since there is no 'nest' 1268753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // parameter, there is no need to adjust the argument list. Let the generic 1269753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner // code sort out any function type mismatches. 1270753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner Constant *NewCallee = 12710c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher NestF->getType() == PTy ? NestF : 1272753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner ConstantExpr::getBitCast(NestF, PTy); 1273753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner CS.setCalledFunction(NewCallee); 1274753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner return CS.getInstruction(); 1275753a2b464d0628231bd3dce645edd05dfbaa3a06Chris Lattner} 12760c6a8f9eda4651e0f54a7edf171525d16b1ff3faEric Christopher 1277