| //===- InstCombineCalls.cpp -----------------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements the visitCall and visitInvoke functions. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "InstCombineInternal.h" |
| #include "llvm/ADT/Statistic.h" |
| #include "llvm/Analysis/InstructionSimplify.h" |
| #include "llvm/Analysis/MemoryBuiltins.h" |
| #include "llvm/IR/CallSite.h" |
| #include "llvm/IR/Dominators.h" |
| #include "llvm/IR/PatternMatch.h" |
| #include "llvm/IR/Statepoint.h" |
| #include "llvm/Transforms/Utils/BuildLibCalls.h" |
| #include "llvm/Transforms/Utils/Local.h" |
| #include "llvm/Transforms/Utils/SimplifyLibCalls.h" |
| using namespace llvm; |
| using namespace PatternMatch; |
| |
| #define DEBUG_TYPE "instcombine" |
| |
| STATISTIC(NumSimplified, "Number of library calls simplified"); |
| |
| /// getPromotedType - Return the specified type promoted as it would be to pass |
| /// though a va_arg area. |
| static Type *getPromotedType(Type *Ty) { |
| if (IntegerType* ITy = dyn_cast<IntegerType>(Ty)) { |
| if (ITy->getBitWidth() < 32) |
| return Type::getInt32Ty(Ty->getContext()); |
| } |
| return Ty; |
| } |
| |
| /// reduceToSingleValueType - Given an aggregate type which ultimately holds a |
| /// single scalar element, like {{{type}}} or [1 x type], return type. |
| static Type *reduceToSingleValueType(Type *T) { |
| while (!T->isSingleValueType()) { |
| if (StructType *STy = dyn_cast<StructType>(T)) { |
| if (STy->getNumElements() == 1) |
| T = STy->getElementType(0); |
| else |
| break; |
| } else if (ArrayType *ATy = dyn_cast<ArrayType>(T)) { |
| if (ATy->getNumElements() == 1) |
| T = ATy->getElementType(); |
| else |
| break; |
| } else |
| break; |
| } |
| |
| return T; |
| } |
| |
| Instruction *InstCombiner::SimplifyMemTransfer(MemIntrinsic *MI) { |
| unsigned DstAlign = getKnownAlignment(MI->getArgOperand(0), DL, MI, AC, DT); |
| unsigned SrcAlign = getKnownAlignment(MI->getArgOperand(1), DL, MI, AC, DT); |
| unsigned MinAlign = std::min(DstAlign, SrcAlign); |
| unsigned CopyAlign = MI->getAlignment(); |
| |
| if (CopyAlign < MinAlign) { |
| MI->setAlignment(ConstantInt::get(MI->getAlignmentType(), |
| MinAlign, false)); |
| return MI; |
| } |
| |
| // If MemCpyInst length is 1/2/4/8 bytes then replace memcpy with |
| // load/store. |
| ConstantInt *MemOpLength = dyn_cast<ConstantInt>(MI->getArgOperand(2)); |
| if (!MemOpLength) return nullptr; |
| |
| // Source and destination pointer types are always "i8*" for intrinsic. See |
| // if the size is something we can handle with a single primitive load/store. |
| // A single load+store correctly handles overlapping memory in the memmove |
| // case. |
| uint64_t Size = MemOpLength->getLimitedValue(); |
| assert(Size && "0-sized memory transferring should be removed already."); |
| |
| if (Size > 8 || (Size&(Size-1))) |
| return nullptr; // If not 1/2/4/8 bytes, exit. |
| |
| // Use an integer load+store unless we can find something better. |
| unsigned SrcAddrSp = |
| cast<PointerType>(MI->getArgOperand(1)->getType())->getAddressSpace(); |
| unsigned DstAddrSp = |
| cast<PointerType>(MI->getArgOperand(0)->getType())->getAddressSpace(); |
| |
| IntegerType* IntType = IntegerType::get(MI->getContext(), Size<<3); |
| Type *NewSrcPtrTy = PointerType::get(IntType, SrcAddrSp); |
| Type *NewDstPtrTy = PointerType::get(IntType, DstAddrSp); |
| |
| // Memcpy forces the use of i8* for the source and destination. That means |
| // that if you're using memcpy to move one double around, you'll get a cast |
| // from double* to i8*. We'd much rather use a double load+store rather than |
| // an i64 load+store, here because this improves the odds that the source or |
| // dest address will be promotable. See if we can find a better type than the |
| // integer datatype. |
| Value *StrippedDest = MI->getArgOperand(0)->stripPointerCasts(); |
| MDNode *CopyMD = nullptr; |
| if (StrippedDest != MI->getArgOperand(0)) { |
| Type *SrcETy = cast<PointerType>(StrippedDest->getType()) |
| ->getElementType(); |
| if (SrcETy->isSized() && DL.getTypeStoreSize(SrcETy) == Size) { |
| // The SrcETy might be something like {{{double}}} or [1 x double]. Rip |
| // down through these levels if so. |
| SrcETy = reduceToSingleValueType(SrcETy); |
| |
| if (SrcETy->isSingleValueType()) { |
| NewSrcPtrTy = PointerType::get(SrcETy, SrcAddrSp); |
| NewDstPtrTy = PointerType::get(SrcETy, DstAddrSp); |
| |
| // If the memcpy has metadata describing the members, see if we can |
| // get the TBAA tag describing our copy. |
| if (MDNode *M = MI->getMetadata(LLVMContext::MD_tbaa_struct)) { |
| if (M->getNumOperands() == 3 && M->getOperand(0) && |
| mdconst::hasa<ConstantInt>(M->getOperand(0)) && |
| mdconst::extract<ConstantInt>(M->getOperand(0))->isNullValue() && |
| M->getOperand(1) && |
| mdconst::hasa<ConstantInt>(M->getOperand(1)) && |
| mdconst::extract<ConstantInt>(M->getOperand(1))->getValue() == |
| Size && |
| M->getOperand(2) && isa<MDNode>(M->getOperand(2))) |
| CopyMD = cast<MDNode>(M->getOperand(2)); |
| } |
| } |
| } |
| } |
| |
| // If the memcpy/memmove provides better alignment info than we can |
| // infer, use it. |
| SrcAlign = std::max(SrcAlign, CopyAlign); |
| DstAlign = std::max(DstAlign, CopyAlign); |
| |
| Value *Src = Builder->CreateBitCast(MI->getArgOperand(1), NewSrcPtrTy); |
| Value *Dest = Builder->CreateBitCast(MI->getArgOperand(0), NewDstPtrTy); |
| LoadInst *L = Builder->CreateLoad(Src, MI->isVolatile()); |
| L->setAlignment(SrcAlign); |
| if (CopyMD) |
| L->setMetadata(LLVMContext::MD_tbaa, CopyMD); |
| StoreInst *S = Builder->CreateStore(L, Dest, MI->isVolatile()); |
| S->setAlignment(DstAlign); |
| if (CopyMD) |
| S->setMetadata(LLVMContext::MD_tbaa, CopyMD); |
| |
| // Set the size of the copy to 0, it will be deleted on the next iteration. |
| MI->setArgOperand(2, Constant::getNullValue(MemOpLength->getType())); |
| return MI; |
| } |
| |
| Instruction *InstCombiner::SimplifyMemSet(MemSetInst *MI) { |
| unsigned Alignment = getKnownAlignment(MI->getDest(), DL, MI, AC, DT); |
| if (MI->getAlignment() < Alignment) { |
| MI->setAlignment(ConstantInt::get(MI->getAlignmentType(), |
| Alignment, false)); |
| return MI; |
| } |
| |
| // Extract the length and alignment and fill if they are constant. |
| ConstantInt *LenC = dyn_cast<ConstantInt>(MI->getLength()); |
| ConstantInt *FillC = dyn_cast<ConstantInt>(MI->getValue()); |
| if (!LenC || !FillC || !FillC->getType()->isIntegerTy(8)) |
| return nullptr; |
| uint64_t Len = LenC->getLimitedValue(); |
| Alignment = MI->getAlignment(); |
| assert(Len && "0-sized memory setting should be removed already."); |
| |
| // memset(s,c,n) -> store s, c (for n=1,2,4,8) |
| if (Len <= 8 && isPowerOf2_32((uint32_t)Len)) { |
| Type *ITy = IntegerType::get(MI->getContext(), Len*8); // n=1 -> i8. |
| |
| Value *Dest = MI->getDest(); |
| unsigned DstAddrSp = cast<PointerType>(Dest->getType())->getAddressSpace(); |
| Type *NewDstPtrTy = PointerType::get(ITy, DstAddrSp); |
| Dest = Builder->CreateBitCast(Dest, NewDstPtrTy); |
| |
| // Alignment 0 is identity for alignment 1 for memset, but not store. |
| if (Alignment == 0) Alignment = 1; |
| |
| // Extract the fill value and store. |
| uint64_t Fill = FillC->getZExtValue()*0x0101010101010101ULL; |
| StoreInst *S = Builder->CreateStore(ConstantInt::get(ITy, Fill), Dest, |
| MI->isVolatile()); |
| S->setAlignment(Alignment); |
| |
| // Set the size of the copy to 0, it will be deleted on the next iteration. |
| MI->setLength(Constant::getNullValue(LenC->getType())); |
| return MI; |
| } |
| |
| return nullptr; |
| } |
| |
| static Value *SimplifyX86insertps(const IntrinsicInst &II, |
| InstCombiner::BuilderTy &Builder) { |
| if (auto *CInt = dyn_cast<ConstantInt>(II.getArgOperand(2))) { |
| VectorType *VecTy = cast<VectorType>(II.getType()); |
| assert(VecTy->getNumElements() == 4 && "insertps with wrong vector type"); |
| |
| // The immediate permute control byte looks like this: |
| // [3:0] - zero mask for each 32-bit lane |
| // [5:4] - select one 32-bit destination lane |
| // [7:6] - select one 32-bit source lane |
| |
| uint8_t Imm = CInt->getZExtValue(); |
| uint8_t ZMask = Imm & 0xf; |
| uint8_t DestLane = (Imm >> 4) & 0x3; |
| uint8_t SourceLane = (Imm >> 6) & 0x3; |
| |
| ConstantAggregateZero *ZeroVector = ConstantAggregateZero::get(VecTy); |
| |
| // If all zero mask bits are set, this was just a weird way to |
| // generate a zero vector. |
| if (ZMask == 0xf) |
| return ZeroVector; |
| |
| // Initialize by passing all of the first source bits through. |
| int ShuffleMask[4] = { 0, 1, 2, 3 }; |
| |
| // We may replace the second operand with the zero vector. |
| Value *V1 = II.getArgOperand(1); |
| |
| if (ZMask) { |
| // If the zero mask is being used with a single input or the zero mask |
| // overrides the destination lane, this is a shuffle with the zero vector. |
| if ((II.getArgOperand(0) == II.getArgOperand(1)) || |
| (ZMask & (1 << DestLane))) { |
| V1 = ZeroVector; |
| // We may still move 32-bits of the first source vector from one lane |
| // to another. |
| ShuffleMask[DestLane] = SourceLane; |
| // The zero mask may override the previous insert operation. |
| for (unsigned i = 0; i < 4; ++i) |
| if ((ZMask >> i) & 0x1) |
| ShuffleMask[i] = i + 4; |
| } else { |
| // TODO: Model this case as 2 shuffles or a 'logical and' plus shuffle? |
| return nullptr; |
| } |
| } else { |
| // Replace the selected destination lane with the selected source lane. |
| ShuffleMask[DestLane] = SourceLane + 4; |
| } |
| |
| return Builder.CreateShuffleVector(II.getArgOperand(0), V1, ShuffleMask); |
| } |
| return nullptr; |
| } |
| |
| /// The shuffle mask for a perm2*128 selects any two halves of two 256-bit |
| /// source vectors, unless a zero bit is set. If a zero bit is set, |
| /// then ignore that half of the mask and clear that half of the vector. |
| static Value *SimplifyX86vperm2(const IntrinsicInst &II, |
| InstCombiner::BuilderTy &Builder) { |
| if (auto *CInt = dyn_cast<ConstantInt>(II.getArgOperand(2))) { |
| VectorType *VecTy = cast<VectorType>(II.getType()); |
| ConstantAggregateZero *ZeroVector = ConstantAggregateZero::get(VecTy); |
| |
| // The immediate permute control byte looks like this: |
| // [1:0] - select 128 bits from sources for low half of destination |
| // [2] - ignore |
| // [3] - zero low half of destination |
| // [5:4] - select 128 bits from sources for high half of destination |
| // [6] - ignore |
| // [7] - zero high half of destination |
| |
| uint8_t Imm = CInt->getZExtValue(); |
| |
| bool LowHalfZero = Imm & 0x08; |
| bool HighHalfZero = Imm & 0x80; |
| |
| // If both zero mask bits are set, this was just a weird way to |
| // generate a zero vector. |
| if (LowHalfZero && HighHalfZero) |
| return ZeroVector; |
| |
| // If 0 or 1 zero mask bits are set, this is a simple shuffle. |
| unsigned NumElts = VecTy->getNumElements(); |
| unsigned HalfSize = NumElts / 2; |
| SmallVector<int, 8> ShuffleMask(NumElts); |
| |
| // The high bit of the selection field chooses the 1st or 2nd operand. |
| bool LowInputSelect = Imm & 0x02; |
| bool HighInputSelect = Imm & 0x20; |
| |
| // The low bit of the selection field chooses the low or high half |
| // of the selected operand. |
| bool LowHalfSelect = Imm & 0x01; |
| bool HighHalfSelect = Imm & 0x10; |
| |
| // Determine which operand(s) are actually in use for this instruction. |
| Value *V0 = LowInputSelect ? II.getArgOperand(1) : II.getArgOperand(0); |
| Value *V1 = HighInputSelect ? II.getArgOperand(1) : II.getArgOperand(0); |
| |
| // If needed, replace operands based on zero mask. |
| V0 = LowHalfZero ? ZeroVector : V0; |
| V1 = HighHalfZero ? ZeroVector : V1; |
| |
| // Permute low half of result. |
| unsigned StartIndex = LowHalfSelect ? HalfSize : 0; |
| for (unsigned i = 0; i < HalfSize; ++i) |
| ShuffleMask[i] = StartIndex + i; |
| |
| // Permute high half of result. |
| StartIndex = HighHalfSelect ? HalfSize : 0; |
| StartIndex += NumElts; |
| for (unsigned i = 0; i < HalfSize; ++i) |
| ShuffleMask[i + HalfSize] = StartIndex + i; |
| |
| return Builder.CreateShuffleVector(V0, V1, ShuffleMask); |
| } |
| return nullptr; |
| } |
| |
| /// visitCallInst - CallInst simplification. This mostly only handles folding |
| /// of intrinsic instructions. For normal calls, it allows visitCallSite to do |
| /// the heavy lifting. |
| /// |
| Instruction *InstCombiner::visitCallInst(CallInst &CI) { |
| auto Args = CI.arg_operands(); |
| if (Value *V = SimplifyCall(CI.getCalledValue(), Args.begin(), Args.end(), DL, |
| TLI, DT, AC)) |
| return ReplaceInstUsesWith(CI, V); |
| |
| if (isFreeCall(&CI, TLI)) |
| return visitFree(CI); |
| |
| // If the caller function is nounwind, mark the call as nounwind, even if the |
| // callee isn't. |
| if (CI.getParent()->getParent()->doesNotThrow() && |
| !CI.doesNotThrow()) { |
| CI.setDoesNotThrow(); |
| return &CI; |
| } |
| |
| IntrinsicInst *II = dyn_cast<IntrinsicInst>(&CI); |
| if (!II) return visitCallSite(&CI); |
| |
| // Intrinsics cannot occur in an invoke, so handle them here instead of in |
| // visitCallSite. |
| if (MemIntrinsic *MI = dyn_cast<MemIntrinsic>(II)) { |
| bool Changed = false; |
| |
| // memmove/cpy/set of zero bytes is a noop. |
| if (Constant *NumBytes = dyn_cast<Constant>(MI->getLength())) { |
| if (NumBytes->isNullValue()) |
| return EraseInstFromFunction(CI); |
| |
| if (ConstantInt *CI = dyn_cast<ConstantInt>(NumBytes)) |
| if (CI->getZExtValue() == 1) { |
| // Replace the instruction with just byte operations. We would |
| // transform other cases to loads/stores, but we don't know if |
| // alignment is sufficient. |
| } |
| } |
| |
| // No other transformations apply to volatile transfers. |
| if (MI->isVolatile()) |
| return nullptr; |
| |
| // If we have a memmove and the source operation is a constant global, |
| // then the source and dest pointers can't alias, so we can change this |
| // into a call to memcpy. |
| if (MemMoveInst *MMI = dyn_cast<MemMoveInst>(MI)) { |
| if (GlobalVariable *GVSrc = dyn_cast<GlobalVariable>(MMI->getSource())) |
| if (GVSrc->isConstant()) { |
| Module *M = CI.getParent()->getParent()->getParent(); |
| Intrinsic::ID MemCpyID = Intrinsic::memcpy; |
| Type *Tys[3] = { CI.getArgOperand(0)->getType(), |
| CI.getArgOperand(1)->getType(), |
| CI.getArgOperand(2)->getType() }; |
| CI.setCalledFunction(Intrinsic::getDeclaration(M, MemCpyID, Tys)); |
| Changed = true; |
| } |
| } |
| |
| if (MemTransferInst *MTI = dyn_cast<MemTransferInst>(MI)) { |
| // memmove(x,x,size) -> noop. |
| if (MTI->getSource() == MTI->getDest()) |
| return EraseInstFromFunction(CI); |
| } |
| |
| // If we can determine a pointer alignment that is bigger than currently |
| // set, update the alignment. |
| if (isa<MemTransferInst>(MI)) { |
| if (Instruction *I = SimplifyMemTransfer(MI)) |
| return I; |
| } else if (MemSetInst *MSI = dyn_cast<MemSetInst>(MI)) { |
| if (Instruction *I = SimplifyMemSet(MSI)) |
| return I; |
| } |
| |
| if (Changed) return II; |
| } |
| |
| switch (II->getIntrinsicID()) { |
| default: break; |
| case Intrinsic::objectsize: { |
| uint64_t Size; |
| if (getObjectSize(II->getArgOperand(0), Size, DL, TLI)) |
| return ReplaceInstUsesWith(CI, ConstantInt::get(CI.getType(), Size)); |
| return nullptr; |
| } |
| case Intrinsic::bswap: { |
| Value *IIOperand = II->getArgOperand(0); |
| Value *X = nullptr; |
| |
| // bswap(bswap(x)) -> x |
| if (match(IIOperand, m_BSwap(m_Value(X)))) |
| return ReplaceInstUsesWith(CI, X); |
| |
| // bswap(trunc(bswap(x))) -> trunc(lshr(x, c)) |
| if (match(IIOperand, m_Trunc(m_BSwap(m_Value(X))))) { |
| unsigned C = X->getType()->getPrimitiveSizeInBits() - |
| IIOperand->getType()->getPrimitiveSizeInBits(); |
| Value *CV = ConstantInt::get(X->getType(), C); |
| Value *V = Builder->CreateLShr(X, CV); |
| return new TruncInst(V, IIOperand->getType()); |
| } |
| break; |
| } |
| |
| case Intrinsic::powi: |
| if (ConstantInt *Power = dyn_cast<ConstantInt>(II->getArgOperand(1))) { |
| // powi(x, 0) -> 1.0 |
| if (Power->isZero()) |
| return ReplaceInstUsesWith(CI, ConstantFP::get(CI.getType(), 1.0)); |
| // powi(x, 1) -> x |
| if (Power->isOne()) |
| return ReplaceInstUsesWith(CI, II->getArgOperand(0)); |
| // powi(x, -1) -> 1/x |
| if (Power->isAllOnesValue()) |
| return BinaryOperator::CreateFDiv(ConstantFP::get(CI.getType(), 1.0), |
| II->getArgOperand(0)); |
| } |
| break; |
| case Intrinsic::cttz: { |
| // If all bits below the first known one are known zero, |
| // this value is constant. |
| IntegerType *IT = dyn_cast<IntegerType>(II->getArgOperand(0)->getType()); |
| // FIXME: Try to simplify vectors of integers. |
| if (!IT) break; |
| uint32_t BitWidth = IT->getBitWidth(); |
| APInt KnownZero(BitWidth, 0); |
| APInt KnownOne(BitWidth, 0); |
| computeKnownBits(II->getArgOperand(0), KnownZero, KnownOne, 0, II); |
| unsigned TrailingZeros = KnownOne.countTrailingZeros(); |
| APInt Mask(APInt::getLowBitsSet(BitWidth, TrailingZeros)); |
| if ((Mask & KnownZero) == Mask) |
| return ReplaceInstUsesWith(CI, ConstantInt::get(IT, |
| APInt(BitWidth, TrailingZeros))); |
| |
| } |
| break; |
| case Intrinsic::ctlz: { |
| // If all bits above the first known one are known zero, |
| // this value is constant. |
| IntegerType *IT = dyn_cast<IntegerType>(II->getArgOperand(0)->getType()); |
| // FIXME: Try to simplify vectors of integers. |
| if (!IT) break; |
| uint32_t BitWidth = IT->getBitWidth(); |
| APInt KnownZero(BitWidth, 0); |
| APInt KnownOne(BitWidth, 0); |
| computeKnownBits(II->getArgOperand(0), KnownZero, KnownOne, 0, II); |
| unsigned LeadingZeros = KnownOne.countLeadingZeros(); |
| APInt Mask(APInt::getHighBitsSet(BitWidth, LeadingZeros)); |
| if ((Mask & KnownZero) == Mask) |
| return ReplaceInstUsesWith(CI, ConstantInt::get(IT, |
| APInt(BitWidth, LeadingZeros))); |
| |
| } |
| break; |
| |
| case Intrinsic::uadd_with_overflow: |
| case Intrinsic::sadd_with_overflow: |
| case Intrinsic::umul_with_overflow: |
| case Intrinsic::smul_with_overflow: |
| if (isa<Constant>(II->getArgOperand(0)) && |
| !isa<Constant>(II->getArgOperand(1))) { |
| // Canonicalize constants into the RHS. |
| Value *LHS = II->getArgOperand(0); |
| II->setArgOperand(0, II->getArgOperand(1)); |
| II->setArgOperand(1, LHS); |
| return II; |
| } |
| // fall through |
| |
| case Intrinsic::usub_with_overflow: |
| case Intrinsic::ssub_with_overflow: { |
| OverflowCheckFlavor OCF = |
| IntrinsicIDToOverflowCheckFlavor(II->getIntrinsicID()); |
| assert(OCF != OCF_INVALID && "unexpected!"); |
| |
| Value *OperationResult = nullptr; |
| Constant *OverflowResult = nullptr; |
| if (OptimizeOverflowCheck(OCF, II->getArgOperand(0), II->getArgOperand(1), |
| *II, OperationResult, OverflowResult)) |
| return CreateOverflowTuple(II, OperationResult, OverflowResult); |
| |
| break; |
| } |
| |
| case Intrinsic::minnum: |
| case Intrinsic::maxnum: { |
| Value *Arg0 = II->getArgOperand(0); |
| Value *Arg1 = II->getArgOperand(1); |
| |
| // fmin(x, x) -> x |
| if (Arg0 == Arg1) |
| return ReplaceInstUsesWith(CI, Arg0); |
| |
| const ConstantFP *C0 = dyn_cast<ConstantFP>(Arg0); |
| const ConstantFP *C1 = dyn_cast<ConstantFP>(Arg1); |
| |
| // Canonicalize constants into the RHS. |
| if (C0 && !C1) { |
| II->setArgOperand(0, Arg1); |
| II->setArgOperand(1, Arg0); |
| return II; |
| } |
| |
| // fmin(x, nan) -> x |
| if (C1 && C1->isNaN()) |
| return ReplaceInstUsesWith(CI, Arg0); |
| |
| // This is the value because if undef were NaN, we would return the other |
| // value and cannot return a NaN unless both operands are. |
| // |
| // fmin(undef, x) -> x |
| if (isa<UndefValue>(Arg0)) |
| return ReplaceInstUsesWith(CI, Arg1); |
| |
| // fmin(x, undef) -> x |
| if (isa<UndefValue>(Arg1)) |
| return ReplaceInstUsesWith(CI, Arg0); |
| |
| Value *X = nullptr; |
| Value *Y = nullptr; |
| if (II->getIntrinsicID() == Intrinsic::minnum) { |
| // fmin(x, fmin(x, y)) -> fmin(x, y) |
| // fmin(y, fmin(x, y)) -> fmin(x, y) |
| if (match(Arg1, m_FMin(m_Value(X), m_Value(Y)))) { |
| if (Arg0 == X || Arg0 == Y) |
| return ReplaceInstUsesWith(CI, Arg1); |
| } |
| |
| // fmin(fmin(x, y), x) -> fmin(x, y) |
| // fmin(fmin(x, y), y) -> fmin(x, y) |
| if (match(Arg0, m_FMin(m_Value(X), m_Value(Y)))) { |
| if (Arg1 == X || Arg1 == Y) |
| return ReplaceInstUsesWith(CI, Arg0); |
| } |
| |
| // TODO: fmin(nnan x, inf) -> x |
| // TODO: fmin(nnan ninf x, flt_max) -> x |
| if (C1 && C1->isInfinity()) { |
| // fmin(x, -inf) -> -inf |
| if (C1->isNegative()) |
| return ReplaceInstUsesWith(CI, Arg1); |
| } |
| } else { |
| assert(II->getIntrinsicID() == Intrinsic::maxnum); |
| // fmax(x, fmax(x, y)) -> fmax(x, y) |
| // fmax(y, fmax(x, y)) -> fmax(x, y) |
| if (match(Arg1, m_FMax(m_Value(X), m_Value(Y)))) { |
| if (Arg0 == X || Arg0 == Y) |
| return ReplaceInstUsesWith(CI, Arg1); |
| } |
| |
| // fmax(fmax(x, y), x) -> fmax(x, y) |
| // fmax(fmax(x, y), y) -> fmax(x, y) |
| if (match(Arg0, m_FMax(m_Value(X), m_Value(Y)))) { |
| if (Arg1 == X || Arg1 == Y) |
| return ReplaceInstUsesWith(CI, Arg0); |
| } |
| |
| // TODO: fmax(nnan x, -inf) -> x |
| // TODO: fmax(nnan ninf x, -flt_max) -> x |
| if (C1 && C1->isInfinity()) { |
| // fmax(x, inf) -> inf |
| if (!C1->isNegative()) |
| return ReplaceInstUsesWith(CI, Arg1); |
| } |
| } |
| break; |
| } |
| case Intrinsic::ppc_altivec_lvx: |
| case Intrinsic::ppc_altivec_lvxl: |
| // Turn PPC lvx -> load if the pointer is known aligned. |
| if (getOrEnforceKnownAlignment(II->getArgOperand(0), 16, DL, II, AC, DT) >= |
| 16) { |
| Value *Ptr = Builder->CreateBitCast(II->getArgOperand(0), |
| PointerType::getUnqual(II->getType())); |
| return new LoadInst(Ptr); |
| } |
| break; |
| case Intrinsic::ppc_vsx_lxvw4x: |
| case Intrinsic::ppc_vsx_lxvd2x: { |
| // Turn PPC VSX loads into normal loads. |
| Value *Ptr = Builder->CreateBitCast(II->getArgOperand(0), |
| PointerType::getUnqual(II->getType())); |
| return new LoadInst(Ptr, Twine(""), false, 1); |
| } |
| case Intrinsic::ppc_altivec_stvx: |
| case Intrinsic::ppc_altivec_stvxl: |
| // Turn stvx -> store if the pointer is known aligned. |
| if (getOrEnforceKnownAlignment(II->getArgOperand(1), 16, DL, II, AC, DT) >= |
| 16) { |
| Type *OpPtrTy = |
| PointerType::getUnqual(II->getArgOperand(0)->getType()); |
| Value *Ptr = Builder->CreateBitCast(II->getArgOperand(1), OpPtrTy); |
| return new StoreInst(II->getArgOperand(0), Ptr); |
| } |
| break; |
| case Intrinsic::ppc_vsx_stxvw4x: |
| case Intrinsic::ppc_vsx_stxvd2x: { |
| // Turn PPC VSX stores into normal stores. |
| Type *OpPtrTy = PointerType::getUnqual(II->getArgOperand(0)->getType()); |
| Value *Ptr = Builder->CreateBitCast(II->getArgOperand(1), OpPtrTy); |
| return new StoreInst(II->getArgOperand(0), Ptr, false, 1); |
| } |
| case Intrinsic::ppc_qpx_qvlfs: |
| // Turn PPC QPX qvlfs -> load if the pointer is known aligned. |
| if (getOrEnforceKnownAlignment(II->getArgOperand(0), 16, DL, II, AC, DT) >= |
| 16) { |
| Type *VTy = VectorType::get(Builder->getFloatTy(), |
| II->getType()->getVectorNumElements()); |
| Value *Ptr = Builder->CreateBitCast(II->getArgOperand(0), |
| PointerType::getUnqual(VTy)); |
| Value *Load = Builder->CreateLoad(Ptr); |
| return new FPExtInst(Load, II->getType()); |
| } |
| break; |
| case Intrinsic::ppc_qpx_qvlfd: |
| // Turn PPC QPX qvlfd -> load if the pointer is known aligned. |
| if (getOrEnforceKnownAlignment(II->getArgOperand(0), 32, DL, II, AC, DT) >= |
| 32) { |
| Value *Ptr = Builder->CreateBitCast(II->getArgOperand(0), |
| PointerType::getUnqual(II->getType())); |
| return new LoadInst(Ptr); |
| } |
| break; |
| case Intrinsic::ppc_qpx_qvstfs: |
| // Turn PPC QPX qvstfs -> store if the pointer is known aligned. |
| if (getOrEnforceKnownAlignment(II->getArgOperand(1), 16, DL, II, AC, DT) >= |
| 16) { |
| Type *VTy = VectorType::get(Builder->getFloatTy(), |
| II->getArgOperand(0)->getType()->getVectorNumElements()); |
| Value *TOp = Builder->CreateFPTrunc(II->getArgOperand(0), VTy); |
| Type *OpPtrTy = PointerType::getUnqual(VTy); |
| Value *Ptr = Builder->CreateBitCast(II->getArgOperand(1), OpPtrTy); |
| return new StoreInst(TOp, Ptr); |
| } |
| break; |
| case Intrinsic::ppc_qpx_qvstfd: |
| // Turn PPC QPX qvstfd -> store if the pointer is known aligned. |
| if (getOrEnforceKnownAlignment(II->getArgOperand(1), 32, DL, II, AC, DT) >= |
| 32) { |
| Type *OpPtrTy = |
| PointerType::getUnqual(II->getArgOperand(0)->getType()); |
| Value *Ptr = Builder->CreateBitCast(II->getArgOperand(1), OpPtrTy); |
| return new StoreInst(II->getArgOperand(0), Ptr); |
| } |
| break; |
| case Intrinsic::x86_sse_storeu_ps: |
| case Intrinsic::x86_sse2_storeu_pd: |
| case Intrinsic::x86_sse2_storeu_dq: |
| // Turn X86 storeu -> store if the pointer is known aligned. |
| if (getOrEnforceKnownAlignment(II->getArgOperand(0), 16, DL, II, AC, DT) >= |
| 16) { |
| Type *OpPtrTy = |
| PointerType::getUnqual(II->getArgOperand(1)->getType()); |
| Value *Ptr = Builder->CreateBitCast(II->getArgOperand(0), OpPtrTy); |
| return new StoreInst(II->getArgOperand(1), Ptr); |
| } |
| break; |
| |
| case Intrinsic::x86_sse_cvtss2si: |
| case Intrinsic::x86_sse_cvtss2si64: |
| case Intrinsic::x86_sse_cvttss2si: |
| case Intrinsic::x86_sse_cvttss2si64: |
| case Intrinsic::x86_sse2_cvtsd2si: |
| case Intrinsic::x86_sse2_cvtsd2si64: |
| case Intrinsic::x86_sse2_cvttsd2si: |
| case Intrinsic::x86_sse2_cvttsd2si64: { |
| // These intrinsics only demand the 0th element of their input vectors. If |
| // we can simplify the input based on that, do so now. |
| unsigned VWidth = |
| cast<VectorType>(II->getArgOperand(0)->getType())->getNumElements(); |
| APInt DemandedElts(VWidth, 1); |
| APInt UndefElts(VWidth, 0); |
| if (Value *V = SimplifyDemandedVectorElts(II->getArgOperand(0), |
| DemandedElts, UndefElts)) { |
| II->setArgOperand(0, V); |
| return II; |
| } |
| break; |
| } |
| |
| // Constant fold <A x Bi> << Ci. |
| // FIXME: We don't handle _dq because it's a shift of an i128, but is |
| // represented in the IR as <2 x i64>. A per element shift is wrong. |
| case Intrinsic::x86_sse2_psll_d: |
| case Intrinsic::x86_sse2_psll_q: |
| case Intrinsic::x86_sse2_psll_w: |
| case Intrinsic::x86_sse2_pslli_d: |
| case Intrinsic::x86_sse2_pslli_q: |
| case Intrinsic::x86_sse2_pslli_w: |
| case Intrinsic::x86_avx2_psll_d: |
| case Intrinsic::x86_avx2_psll_q: |
| case Intrinsic::x86_avx2_psll_w: |
| case Intrinsic::x86_avx2_pslli_d: |
| case Intrinsic::x86_avx2_pslli_q: |
| case Intrinsic::x86_avx2_pslli_w: |
| case Intrinsic::x86_sse2_psrl_d: |
| case Intrinsic::x86_sse2_psrl_q: |
| case Intrinsic::x86_sse2_psrl_w: |
| case Intrinsic::x86_sse2_psrli_d: |
| case Intrinsic::x86_sse2_psrli_q: |
| case Intrinsic::x86_sse2_psrli_w: |
| case Intrinsic::x86_avx2_psrl_d: |
| case Intrinsic::x86_avx2_psrl_q: |
| case Intrinsic::x86_avx2_psrl_w: |
| case Intrinsic::x86_avx2_psrli_d: |
| case Intrinsic::x86_avx2_psrli_q: |
| case Intrinsic::x86_avx2_psrli_w: { |
| // Simplify if count is constant. To 0 if >= BitWidth, |
| // otherwise to shl/lshr. |
| auto CDV = dyn_cast<ConstantDataVector>(II->getArgOperand(1)); |
| auto CInt = dyn_cast<ConstantInt>(II->getArgOperand(1)); |
| if (!CDV && !CInt) |
| break; |
| ConstantInt *Count; |
| if (CDV) |
| Count = cast<ConstantInt>(CDV->getElementAsConstant(0)); |
| else |
| Count = CInt; |
| |
| auto Vec = II->getArgOperand(0); |
| auto VT = cast<VectorType>(Vec->getType()); |
| if (Count->getZExtValue() > |
| VT->getElementType()->getPrimitiveSizeInBits() - 1) |
| return ReplaceInstUsesWith( |
| CI, ConstantAggregateZero::get(Vec->getType())); |
| |
| bool isPackedShiftLeft = true; |
| switch (II->getIntrinsicID()) { |
| default : break; |
| case Intrinsic::x86_sse2_psrl_d: |
| case Intrinsic::x86_sse2_psrl_q: |
| case Intrinsic::x86_sse2_psrl_w: |
| case Intrinsic::x86_sse2_psrli_d: |
| case Intrinsic::x86_sse2_psrli_q: |
| case Intrinsic::x86_sse2_psrli_w: |
| case Intrinsic::x86_avx2_psrl_d: |
| case Intrinsic::x86_avx2_psrl_q: |
| case Intrinsic::x86_avx2_psrl_w: |
| case Intrinsic::x86_avx2_psrli_d: |
| case Intrinsic::x86_avx2_psrli_q: |
| case Intrinsic::x86_avx2_psrli_w: isPackedShiftLeft = false; break; |
| } |
| |
| unsigned VWidth = VT->getNumElements(); |
| // Get a constant vector of the same type as the first operand. |
| auto VTCI = ConstantInt::get(VT->getElementType(), Count->getZExtValue()); |
| if (isPackedShiftLeft) |
| return BinaryOperator::CreateShl(Vec, |
| Builder->CreateVectorSplat(VWidth, VTCI)); |
| |
| return BinaryOperator::CreateLShr(Vec, |
| Builder->CreateVectorSplat(VWidth, VTCI)); |
| } |
| |
| case Intrinsic::x86_sse41_pmovsxbw: |
| case Intrinsic::x86_sse41_pmovsxwd: |
| case Intrinsic::x86_sse41_pmovsxdq: |
| case Intrinsic::x86_sse41_pmovzxbw: |
| case Intrinsic::x86_sse41_pmovzxwd: |
| case Intrinsic::x86_sse41_pmovzxdq: { |
| // pmov{s|z}x ignores the upper half of their input vectors. |
| unsigned VWidth = |
| cast<VectorType>(II->getArgOperand(0)->getType())->getNumElements(); |
| unsigned LowHalfElts = VWidth / 2; |
| APInt InputDemandedElts(APInt::getBitsSet(VWidth, 0, LowHalfElts)); |
| APInt UndefElts(VWidth, 0); |
| if (Value *TmpV = SimplifyDemandedVectorElts( |
| II->getArgOperand(0), InputDemandedElts, UndefElts)) { |
| II->setArgOperand(0, TmpV); |
| return II; |
| } |
| break; |
| } |
| case Intrinsic::x86_sse41_insertps: |
| if (Value *V = SimplifyX86insertps(*II, *Builder)) |
| return ReplaceInstUsesWith(*II, V); |
| break; |
| |
| case Intrinsic::x86_sse4a_insertqi: { |
| // insertqi x, y, 64, 0 can just copy y's lower bits and leave the top |
| // ones undef |
| // TODO: eventually we should lower this intrinsic to IR |
| if (auto CIWidth = dyn_cast<ConstantInt>(II->getArgOperand(2))) { |
| if (auto CIStart = dyn_cast<ConstantInt>(II->getArgOperand(3))) { |
| unsigned Index = CIStart->getZExtValue(); |
| // From AMD documentation: "a value of zero in the field length is |
| // defined as length of 64". |
| unsigned Length = CIWidth->equalsInt(0) ? 64 : CIWidth->getZExtValue(); |
| |
| // From AMD documentation: "If the sum of the bit index + length field |
| // is greater than 64, the results are undefined". |
| |
| // Note that both field index and field length are 8-bit quantities. |
| // Since variables 'Index' and 'Length' are unsigned values |
| // obtained from zero-extending field index and field length |
| // respectively, their sum should never wrap around. |
| if ((Index + Length) > 64) |
| return ReplaceInstUsesWith(CI, UndefValue::get(II->getType())); |
| |
| if (Length == 64 && Index == 0) { |
| Value *Vec = II->getArgOperand(1); |
| Value *Undef = UndefValue::get(Vec->getType()); |
| const uint32_t Mask[] = { 0, 2 }; |
| return ReplaceInstUsesWith( |
| CI, |
| Builder->CreateShuffleVector( |
| Vec, Undef, ConstantDataVector::get( |
| II->getContext(), makeArrayRef(Mask)))); |
| |
| } else if (auto Source = |
| dyn_cast<IntrinsicInst>(II->getArgOperand(0))) { |
| if (Source->hasOneUse() && |
| Source->getArgOperand(1) == II->getArgOperand(1)) { |
| // If the source of the insert has only one use and it's another |
| // insert (and they're both inserting from the same vector), try to |
| // bundle both together. |
| auto CISourceWidth = |
| dyn_cast<ConstantInt>(Source->getArgOperand(2)); |
| auto CISourceStart = |
| dyn_cast<ConstantInt>(Source->getArgOperand(3)); |
| if (CISourceStart && CISourceWidth) { |
| unsigned Start = CIStart->getZExtValue(); |
| unsigned Width = CIWidth->getZExtValue(); |
| unsigned End = Start + Width; |
| unsigned SourceStart = CISourceStart->getZExtValue(); |
| unsigned SourceWidth = CISourceWidth->getZExtValue(); |
| unsigned SourceEnd = SourceStart + SourceWidth; |
| unsigned NewStart, NewWidth; |
| bool ShouldReplace = false; |
| if (Start <= SourceStart && SourceStart <= End) { |
| NewStart = Start; |
| NewWidth = std::max(End, SourceEnd) - NewStart; |
| ShouldReplace = true; |
| } else if (SourceStart <= Start && Start <= SourceEnd) { |
| NewStart = SourceStart; |
| NewWidth = std::max(SourceEnd, End) - NewStart; |
| ShouldReplace = true; |
| } |
| |
| if (ShouldReplace) { |
| Constant *ConstantWidth = ConstantInt::get( |
| II->getArgOperand(2)->getType(), NewWidth, false); |
| Constant *ConstantStart = ConstantInt::get( |
| II->getArgOperand(3)->getType(), NewStart, false); |
| Value *Args[4] = { Source->getArgOperand(0), |
| II->getArgOperand(1), ConstantWidth, |
| ConstantStart }; |
| Module *M = CI.getParent()->getParent()->getParent(); |
| Value *F = |
| Intrinsic::getDeclaration(M, Intrinsic::x86_sse4a_insertqi); |
| return ReplaceInstUsesWith(CI, Builder->CreateCall(F, Args)); |
| } |
| } |
| } |
| } |
| } |
| } |
| break; |
| } |
| |
| case Intrinsic::x86_sse41_pblendvb: |
| case Intrinsic::x86_sse41_blendvps: |
| case Intrinsic::x86_sse41_blendvpd: |
| case Intrinsic::x86_avx_blendv_ps_256: |
| case Intrinsic::x86_avx_blendv_pd_256: |
| case Intrinsic::x86_avx2_pblendvb: { |
| // Convert blendv* to vector selects if the mask is constant. |
| // This optimization is convoluted because the intrinsic is defined as |
| // getting a vector of floats or doubles for the ps and pd versions. |
| // FIXME: That should be changed. |
| Value *Mask = II->getArgOperand(2); |
| if (auto C = dyn_cast<ConstantDataVector>(Mask)) { |
| auto Tyi1 = Builder->getInt1Ty(); |
| auto SelectorType = cast<VectorType>(Mask->getType()); |
| auto EltTy = SelectorType->getElementType(); |
| unsigned Size = SelectorType->getNumElements(); |
| unsigned BitWidth = |
| EltTy->isFloatTy() |
| ? 32 |
| : (EltTy->isDoubleTy() ? 64 : EltTy->getIntegerBitWidth()); |
| assert((BitWidth == 64 || BitWidth == 32 || BitWidth == 8) && |
| "Wrong arguments for variable blend intrinsic"); |
| SmallVector<Constant *, 32> Selectors; |
| for (unsigned I = 0; I < Size; ++I) { |
| // The intrinsics only read the top bit |
| uint64_t Selector; |
| if (BitWidth == 8) |
| Selector = C->getElementAsInteger(I); |
| else |
| Selector = C->getElementAsAPFloat(I).bitcastToAPInt().getZExtValue(); |
| Selectors.push_back(ConstantInt::get(Tyi1, Selector >> (BitWidth - 1))); |
| } |
| auto NewSelector = ConstantVector::get(Selectors); |
| return SelectInst::Create(NewSelector, II->getArgOperand(1), |
| II->getArgOperand(0), "blendv"); |
| } else { |
| break; |
| } |
| } |
| |
| case Intrinsic::x86_avx_vpermilvar_ps: |
| case Intrinsic::x86_avx_vpermilvar_ps_256: |
| case Intrinsic::x86_avx_vpermilvar_pd: |
| case Intrinsic::x86_avx_vpermilvar_pd_256: { |
| // Convert vpermil* to shufflevector if the mask is constant. |
| Value *V = II->getArgOperand(1); |
| unsigned Size = cast<VectorType>(V->getType())->getNumElements(); |
| assert(Size == 8 || Size == 4 || Size == 2); |
| uint32_t Indexes[8]; |
| if (auto C = dyn_cast<ConstantDataVector>(V)) { |
| // The intrinsics only read one or two bits, clear the rest. |
| for (unsigned I = 0; I < Size; ++I) { |
| uint32_t Index = C->getElementAsInteger(I) & 0x3; |
| if (II->getIntrinsicID() == Intrinsic::x86_avx_vpermilvar_pd || |
| II->getIntrinsicID() == Intrinsic::x86_avx_vpermilvar_pd_256) |
| Index >>= 1; |
| Indexes[I] = Index; |
| } |
| } else if (isa<ConstantAggregateZero>(V)) { |
| for (unsigned I = 0; I < Size; ++I) |
| Indexes[I] = 0; |
| } else { |
| break; |
| } |
| // The _256 variants are a bit trickier since the mask bits always index |
| // into the corresponding 128 half. In order to convert to a generic |
| // shuffle, we have to make that explicit. |
| if (II->getIntrinsicID() == Intrinsic::x86_avx_vpermilvar_ps_256 || |
| II->getIntrinsicID() == Intrinsic::x86_avx_vpermilvar_pd_256) { |
| for (unsigned I = Size / 2; I < Size; ++I) |
| Indexes[I] += Size / 2; |
| } |
| auto NewC = |
| ConstantDataVector::get(V->getContext(), makeArrayRef(Indexes, Size)); |
| auto V1 = II->getArgOperand(0); |
| auto V2 = UndefValue::get(V1->getType()); |
| auto Shuffle = Builder->CreateShuffleVector(V1, V2, NewC); |
| return ReplaceInstUsesWith(CI, Shuffle); |
| } |
| |
| case Intrinsic::x86_avx_vperm2f128_pd_256: |
| case Intrinsic::x86_avx_vperm2f128_ps_256: |
| case Intrinsic::x86_avx_vperm2f128_si_256: |
| case Intrinsic::x86_avx2_vperm2i128: |
| if (Value *V = SimplifyX86vperm2(*II, *Builder)) |
| return ReplaceInstUsesWith(*II, V); |
| break; |
| |
| case Intrinsic::ppc_altivec_vperm: |
| // Turn vperm(V1,V2,mask) -> shuffle(V1,V2,mask) if mask is a constant. |
| // Note that ppc_altivec_vperm has a big-endian bias, so when creating |
| // a vectorshuffle for little endian, we must undo the transformation |
| // performed on vec_perm in altivec.h. That is, we must complement |
| // the permutation mask with respect to 31 and reverse the order of |
| // V1 and V2. |
| if (Constant *Mask = dyn_cast<Constant>(II->getArgOperand(2))) { |
| assert(Mask->getType()->getVectorNumElements() == 16 && |
| "Bad type for intrinsic!"); |
| |
| // Check that all of the elements are integer constants or undefs. |
| bool AllEltsOk = true; |
| for (unsigned i = 0; i != 16; ++i) { |
| Constant *Elt = Mask->getAggregateElement(i); |
| if (!Elt || !(isa<ConstantInt>(Elt) || isa<UndefValue>(Elt))) { |
| AllEltsOk = false; |
| break; |
| } |
| } |
| |
| if (AllEltsOk) { |
| // Cast the input vectors to byte vectors. |
| Value *Op0 = Builder->CreateBitCast(II->getArgOperand(0), |
| Mask->getType()); |
| Value *Op1 = Builder->CreateBitCast(II->getArgOperand(1), |
| Mask->getType()); |
| Value *Result = UndefValue::get(Op0->getType()); |
| |
| // Only extract each element once. |
| Value *ExtractedElts[32]; |
| memset(ExtractedElts, 0, sizeof(ExtractedElts)); |
| |
| for (unsigned i = 0; i != 16; ++i) { |
| if (isa<UndefValue>(Mask->getAggregateElement(i))) |
| continue; |
| unsigned Idx = |
| cast<ConstantInt>(Mask->getAggregateElement(i))->getZExtValue(); |
| Idx &= 31; // Match the hardware behavior. |
| if (DL.isLittleEndian()) |
| Idx = 31 - Idx; |
| |
| if (!ExtractedElts[Idx]) { |
| Value *Op0ToUse = (DL.isLittleEndian()) ? Op1 : Op0; |
| Value *Op1ToUse = (DL.isLittleEndian()) ? Op0 : Op1; |
| ExtractedElts[Idx] = |
| Builder->CreateExtractElement(Idx < 16 ? Op0ToUse : Op1ToUse, |
| Builder->getInt32(Idx&15)); |
| } |
| |
| // Insert this value into the result vector. |
| Result = Builder->CreateInsertElement(Result, ExtractedElts[Idx], |
| Builder->getInt32(i)); |
| } |
| return CastInst::Create(Instruction::BitCast, Result, CI.getType()); |
| } |
| } |
| break; |
| |
| case Intrinsic::arm_neon_vld1: |
| case Intrinsic::arm_neon_vld2: |
| case Intrinsic::arm_neon_vld3: |
| case Intrinsic::arm_neon_vld4: |
| case Intrinsic::arm_neon_vld2lane: |
| case Intrinsic::arm_neon_vld3lane: |
| case Intrinsic::arm_neon_vld4lane: |
| case Intrinsic::arm_neon_vst1: |
| case Intrinsic::arm_neon_vst2: |
| case Intrinsic::arm_neon_vst3: |
| case Intrinsic::arm_neon_vst4: |
| case Intrinsic::arm_neon_vst2lane: |
| case Intrinsic::arm_neon_vst3lane: |
| case Intrinsic::arm_neon_vst4lane: { |
| unsigned MemAlign = getKnownAlignment(II->getArgOperand(0), DL, II, AC, DT); |
| unsigned AlignArg = II->getNumArgOperands() - 1; |
| ConstantInt *IntrAlign = dyn_cast<ConstantInt>(II->getArgOperand(AlignArg)); |
| if (IntrAlign && IntrAlign->getZExtValue() < MemAlign) { |
| II->setArgOperand(AlignArg, |
| ConstantInt::get(Type::getInt32Ty(II->getContext()), |
| MemAlign, false)); |
| return II; |
| } |
| break; |
| } |
| |
| case Intrinsic::arm_neon_vmulls: |
| case Intrinsic::arm_neon_vmullu: |
| case Intrinsic::aarch64_neon_smull: |
| case Intrinsic::aarch64_neon_umull: { |
| Value *Arg0 = II->getArgOperand(0); |
| Value *Arg1 = II->getArgOperand(1); |
| |
| // Handle mul by zero first: |
| if (isa<ConstantAggregateZero>(Arg0) || isa<ConstantAggregateZero>(Arg1)) { |
| return ReplaceInstUsesWith(CI, ConstantAggregateZero::get(II->getType())); |
| } |
| |
| // Check for constant LHS & RHS - in this case we just simplify. |
| bool Zext = (II->getIntrinsicID() == Intrinsic::arm_neon_vmullu || |
| II->getIntrinsicID() == Intrinsic::aarch64_neon_umull); |
| VectorType *NewVT = cast<VectorType>(II->getType()); |
| if (Constant *CV0 = dyn_cast<Constant>(Arg0)) { |
| if (Constant *CV1 = dyn_cast<Constant>(Arg1)) { |
| CV0 = ConstantExpr::getIntegerCast(CV0, NewVT, /*isSigned=*/!Zext); |
| CV1 = ConstantExpr::getIntegerCast(CV1, NewVT, /*isSigned=*/!Zext); |
| |
| return ReplaceInstUsesWith(CI, ConstantExpr::getMul(CV0, CV1)); |
| } |
| |
| // Couldn't simplify - canonicalize constant to the RHS. |
| std::swap(Arg0, Arg1); |
| } |
| |
| // Handle mul by one: |
| if (Constant *CV1 = dyn_cast<Constant>(Arg1)) |
| if (ConstantInt *Splat = |
| dyn_cast_or_null<ConstantInt>(CV1->getSplatValue())) |
| if (Splat->isOne()) |
| return CastInst::CreateIntegerCast(Arg0, II->getType(), |
| /*isSigned=*/!Zext); |
| |
| break; |
| } |
| |
| case Intrinsic::AMDGPU_rcp: { |
| if (const ConstantFP *C = dyn_cast<ConstantFP>(II->getArgOperand(0))) { |
| const APFloat &ArgVal = C->getValueAPF(); |
| APFloat Val(ArgVal.getSemantics(), 1.0); |
| APFloat::opStatus Status = Val.divide(ArgVal, |
| APFloat::rmNearestTiesToEven); |
| // Only do this if it was exact and therefore not dependent on the |
| // rounding mode. |
| if (Status == APFloat::opOK) |
| return ReplaceInstUsesWith(CI, ConstantFP::get(II->getContext(), Val)); |
| } |
| |
| break; |
| } |
| case Intrinsic::stackrestore: { |
| // If the save is right next to the restore, remove the restore. This can |
| // happen when variable allocas are DCE'd. |
| if (IntrinsicInst *SS = dyn_cast<IntrinsicInst>(II->getArgOperand(0))) { |
| if (SS->getIntrinsicID() == Intrinsic::stacksave) { |
| BasicBlock::iterator BI = SS; |
| if (&*++BI == II) |
| return EraseInstFromFunction(CI); |
| } |
| } |
| |
| // Scan down this block to see if there is another stack restore in the |
| // same block without an intervening call/alloca. |
| BasicBlock::iterator BI = II; |
| TerminatorInst *TI = II->getParent()->getTerminator(); |
| bool CannotRemove = false; |
| for (++BI; &*BI != TI; ++BI) { |
| if (isa<AllocaInst>(BI)) { |
| CannotRemove = true; |
| break; |
| } |
| if (CallInst *BCI = dyn_cast<CallInst>(BI)) { |
| if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(BCI)) { |
| // If there is a stackrestore below this one, remove this one. |
| if (II->getIntrinsicID() == Intrinsic::stackrestore) |
| return EraseInstFromFunction(CI); |
| // Otherwise, ignore the intrinsic. |
| } else { |
| // If we found a non-intrinsic call, we can't remove the stack |
| // restore. |
| CannotRemove = true; |
| break; |
| } |
| } |
| } |
| |
| // If the stack restore is in a return, resume, or unwind block and if there |
| // are no allocas or calls between the restore and the return, nuke the |
| // restore. |
| if (!CannotRemove && (isa<ReturnInst>(TI) || isa<ResumeInst>(TI))) |
| return EraseInstFromFunction(CI); |
| break; |
| } |
| case Intrinsic::assume: { |
| // Canonicalize assume(a && b) -> assume(a); assume(b); |
| // Note: New assumption intrinsics created here are registered by |
| // the InstCombineIRInserter object. |
| Value *IIOperand = II->getArgOperand(0), *A, *B, |
| *AssumeIntrinsic = II->getCalledValue(); |
| if (match(IIOperand, m_And(m_Value(A), m_Value(B)))) { |
| Builder->CreateCall(AssumeIntrinsic, A, II->getName()); |
| Builder->CreateCall(AssumeIntrinsic, B, II->getName()); |
| return EraseInstFromFunction(*II); |
| } |
| // assume(!(a || b)) -> assume(!a); assume(!b); |
| if (match(IIOperand, m_Not(m_Or(m_Value(A), m_Value(B))))) { |
| Builder->CreateCall(AssumeIntrinsic, Builder->CreateNot(A), |
| II->getName()); |
| Builder->CreateCall(AssumeIntrinsic, Builder->CreateNot(B), |
| II->getName()); |
| return EraseInstFromFunction(*II); |
| } |
| |
| // assume( (load addr) != null ) -> add 'nonnull' metadata to load |
| // (if assume is valid at the load) |
| if (ICmpInst* ICmp = dyn_cast<ICmpInst>(IIOperand)) { |
| Value *LHS = ICmp->getOperand(0); |
| Value *RHS = ICmp->getOperand(1); |
| if (ICmpInst::ICMP_NE == ICmp->getPredicate() && |
| isa<LoadInst>(LHS) && |
| isa<Constant>(RHS) && |
| RHS->getType()->isPointerTy() && |
| cast<Constant>(RHS)->isNullValue()) { |
| LoadInst* LI = cast<LoadInst>(LHS); |
| if (isValidAssumeForContext(II, LI, DT)) { |
| MDNode *MD = MDNode::get(II->getContext(), None); |
| LI->setMetadata(LLVMContext::MD_nonnull, MD); |
| return EraseInstFromFunction(*II); |
| } |
| } |
| // TODO: apply nonnull return attributes to calls and invokes |
| // TODO: apply range metadata for range check patterns? |
| } |
| // If there is a dominating assume with the same condition as this one, |
| // then this one is redundant, and should be removed. |
| APInt KnownZero(1, 0), KnownOne(1, 0); |
| computeKnownBits(IIOperand, KnownZero, KnownOne, 0, II); |
| if (KnownOne.isAllOnesValue()) |
| return EraseInstFromFunction(*II); |
| |
| break; |
| } |
| case Intrinsic::experimental_gc_relocate: { |
| // Translate facts known about a pointer before relocating into |
| // facts about the relocate value, while being careful to |
| // preserve relocation semantics. |
| GCRelocateOperands Operands(II); |
| Value *DerivedPtr = Operands.getDerivedPtr(); |
| auto *GCRelocateType = cast<PointerType>(II->getType()); |
| |
| // Remove the relocation if unused, note that this check is required |
| // to prevent the cases below from looping forever. |
| if (II->use_empty()) |
| return EraseInstFromFunction(*II); |
| |
| // Undef is undef, even after relocation. |
| // TODO: provide a hook for this in GCStrategy. This is clearly legal for |
| // most practical collectors, but there was discussion in the review thread |
| // about whether it was legal for all possible collectors. |
| if (isa<UndefValue>(DerivedPtr)) { |
| // gc_relocate is uncasted. Use undef of gc_relocate's type to replace it. |
| return ReplaceInstUsesWith(*II, UndefValue::get(GCRelocateType)); |
| } |
| |
| // The relocation of null will be null for most any collector. |
| // TODO: provide a hook for this in GCStrategy. There might be some weird |
| // collector this property does not hold for. |
| if (isa<ConstantPointerNull>(DerivedPtr)) { |
| // gc_relocate is uncasted. Use null-pointer of gc_relocate's type to replace it. |
| return ReplaceInstUsesWith(*II, ConstantPointerNull::get(GCRelocateType)); |
| } |
| |
| // isKnownNonNull -> nonnull attribute |
| if (isKnownNonNull(DerivedPtr)) |
| II->addAttribute(AttributeSet::ReturnIndex, Attribute::NonNull); |
| |
| // isDereferenceablePointer -> deref attribute |
| if (isDereferenceablePointer(DerivedPtr, DL)) { |
| if (Argument *A = dyn_cast<Argument>(DerivedPtr)) { |
| uint64_t Bytes = A->getDereferenceableBytes(); |
| II->addDereferenceableAttr(AttributeSet::ReturnIndex, Bytes); |
| } |
| } |
| |
| // TODO: bitcast(relocate(p)) -> relocate(bitcast(p)) |
| // Canonicalize on the type from the uses to the defs |
| |
| // TODO: relocate((gep p, C, C2, ...)) -> gep(relocate(p), C, C2, ...) |
| } |
| } |
| |
| return visitCallSite(II); |
| } |
| |
| // InvokeInst simplification |
| // |
| Instruction *InstCombiner::visitInvokeInst(InvokeInst &II) { |
| return visitCallSite(&II); |
| } |
| |
| /// isSafeToEliminateVarargsCast - If this cast does not affect the value |
| /// passed through the varargs area, we can eliminate the use of the cast. |
| static bool isSafeToEliminateVarargsCast(const CallSite CS, |
| const DataLayout &DL, |
| const CastInst *const CI, |
| const int ix) { |
| if (!CI->isLosslessCast()) |
| return false; |
| |
| // If this is a GC intrinsic, avoid munging types. We need types for |
| // statepoint reconstruction in SelectionDAG. |
| // TODO: This is probably something which should be expanded to all |
| // intrinsics since the entire point of intrinsics is that |
| // they are understandable by the optimizer. |
| if (isStatepoint(CS) || isGCRelocate(CS) || isGCResult(CS)) |
| return false; |
| |
| // The size of ByVal or InAlloca arguments is derived from the type, so we |
| // can't change to a type with a different size. If the size were |
| // passed explicitly we could avoid this check. |
| if (!CS.isByValOrInAllocaArgument(ix)) |
| return true; |
| |
| Type* SrcTy = |
| cast<PointerType>(CI->getOperand(0)->getType())->getElementType(); |
| Type* DstTy = cast<PointerType>(CI->getType())->getElementType(); |
| if (!SrcTy->isSized() || !DstTy->isSized()) |
| return false; |
| if (DL.getTypeAllocSize(SrcTy) != DL.getTypeAllocSize(DstTy)) |
| return false; |
| return true; |
| } |
| |
| // Try to fold some different type of calls here. |
| // Currently we're only working with the checking functions, memcpy_chk, |
| // mempcpy_chk, memmove_chk, memset_chk, strcpy_chk, stpcpy_chk, strncpy_chk, |
| // strcat_chk and strncat_chk. |
| Instruction *InstCombiner::tryOptimizeCall(CallInst *CI) { |
| if (!CI->getCalledFunction()) return nullptr; |
| |
| auto InstCombineRAUW = [this](Instruction *From, Value *With) { |
| ReplaceInstUsesWith(*From, With); |
| }; |
| LibCallSimplifier Simplifier(DL, TLI, InstCombineRAUW); |
| if (Value *With = Simplifier.optimizeCall(CI)) { |
| ++NumSimplified; |
| return CI->use_empty() ? CI : ReplaceInstUsesWith(*CI, With); |
| } |
| |
| return nullptr; |
| } |
| |
| static IntrinsicInst *FindInitTrampolineFromAlloca(Value *TrampMem) { |
| // Strip off at most one level of pointer casts, looking for an alloca. This |
| // is good enough in practice and simpler than handling any number of casts. |
| Value *Underlying = TrampMem->stripPointerCasts(); |
| if (Underlying != TrampMem && |
| (!Underlying->hasOneUse() || Underlying->user_back() != TrampMem)) |
| return nullptr; |
| if (!isa<AllocaInst>(Underlying)) |
| return nullptr; |
| |
| IntrinsicInst *InitTrampoline = nullptr; |
| for (User *U : TrampMem->users()) { |
| IntrinsicInst *II = dyn_cast<IntrinsicInst>(U); |
| if (!II) |
| return nullptr; |
| if (II->getIntrinsicID() == Intrinsic::init_trampoline) { |
| if (InitTrampoline) |
| // More than one init_trampoline writes to this value. Give up. |
| return nullptr; |
| InitTrampoline = II; |
| continue; |
| } |
| if (II->getIntrinsicID() == Intrinsic::adjust_trampoline) |
| // Allow any number of calls to adjust.trampoline. |
| continue; |
| return nullptr; |
| } |
| |
| // No call to init.trampoline found. |
| if (!InitTrampoline) |
| return nullptr; |
| |
| // Check that the alloca is being used in the expected way. |
| if (InitTrampoline->getOperand(0) != TrampMem) |
| return nullptr; |
| |
| return InitTrampoline; |
| } |
| |
| static IntrinsicInst *FindInitTrampolineFromBB(IntrinsicInst *AdjustTramp, |
| Value *TrampMem) { |
| // Visit all the previous instructions in the basic block, and try to find a |
| // init.trampoline which has a direct path to the adjust.trampoline. |
| for (BasicBlock::iterator I = AdjustTramp, |
| E = AdjustTramp->getParent()->begin(); I != E; ) { |
| Instruction *Inst = --I; |
| if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(I)) |
| if (II->getIntrinsicID() == Intrinsic::init_trampoline && |
| II->getOperand(0) == TrampMem) |
| return II; |
| if (Inst->mayWriteToMemory()) |
| return nullptr; |
| } |
| return nullptr; |
| } |
| |
| // Given a call to llvm.adjust.trampoline, find and return the corresponding |
| // call to llvm.init.trampoline if the call to the trampoline can be optimized |
| // to a direct call to a function. Otherwise return NULL. |
| // |
| static IntrinsicInst *FindInitTrampoline(Value *Callee) { |
| Callee = Callee->stripPointerCasts(); |
| IntrinsicInst *AdjustTramp = dyn_cast<IntrinsicInst>(Callee); |
| if (!AdjustTramp || |
| AdjustTramp->getIntrinsicID() != Intrinsic::adjust_trampoline) |
| return nullptr; |
| |
| Value *TrampMem = AdjustTramp->getOperand(0); |
| |
| if (IntrinsicInst *IT = FindInitTrampolineFromAlloca(TrampMem)) |
| return IT; |
| if (IntrinsicInst *IT = FindInitTrampolineFromBB(AdjustTramp, TrampMem)) |
| return IT; |
| return nullptr; |
| } |
| |
| // visitCallSite - Improvements for call and invoke instructions. |
| // |
| Instruction *InstCombiner::visitCallSite(CallSite CS) { |
| |
| if (isAllocLikeFn(CS.getInstruction(), TLI)) |
| return visitAllocSite(*CS.getInstruction()); |
| |
| bool Changed = false; |
| |
| // Mark any parameters that are known to be non-null with the nonnull |
| // attribute. This is helpful for inlining calls to functions with null |
| // checks on their arguments. |
| unsigned ArgNo = 0; |
| for (Value *V : CS.args()) { |
| if (!CS.paramHasAttr(ArgNo+1, Attribute::NonNull) && |
| isKnownNonNull(V)) { |
| AttributeSet AS = CS.getAttributes(); |
| AS = AS.addAttribute(CS.getInstruction()->getContext(), ArgNo+1, |
| Attribute::NonNull); |
| CS.setAttributes(AS); |
| Changed = true; |
| } |
| ArgNo++; |
| } |
| assert(ArgNo == CS.arg_size() && "sanity check"); |
| |
| // If the callee is a pointer to a function, attempt to move any casts to the |
| // arguments of the call/invoke. |
| Value *Callee = CS.getCalledValue(); |
| if (!isa<Function>(Callee) && transformConstExprCastCall(CS)) |
| return nullptr; |
| |
| if (Function *CalleeF = dyn_cast<Function>(Callee)) |
| // If the call and callee calling conventions don't match, this call must |
| // be unreachable, as the call is undefined. |
| if (CalleeF->getCallingConv() != CS.getCallingConv() && |
| // Only do this for calls to a function with a body. A prototype may |
| // not actually end up matching the implementation's calling conv for a |
| // variety of reasons (e.g. it may be written in assembly). |
| !CalleeF->isDeclaration()) { |
| Instruction *OldCall = CS.getInstruction(); |
| new StoreInst(ConstantInt::getTrue(Callee->getContext()), |
| UndefValue::get(Type::getInt1PtrTy(Callee->getContext())), |
| OldCall); |
| // If OldCall does not return void then replaceAllUsesWith undef. |
| // This allows ValueHandlers and custom metadata to adjust itself. |
| if (!OldCall->getType()->isVoidTy()) |
| ReplaceInstUsesWith(*OldCall, UndefValue::get(OldCall->getType())); |
| if (isa<CallInst>(OldCall)) |
| return EraseInstFromFunction(*OldCall); |
| |
| // We cannot remove an invoke, because it would change the CFG, just |
| // change the callee to a null pointer. |
| cast<InvokeInst>(OldCall)->setCalledFunction( |
| Constant::getNullValue(CalleeF->getType())); |
| return nullptr; |
| } |
| |
| if (isa<ConstantPointerNull>(Callee) || isa<UndefValue>(Callee)) { |
| // If CS does not return void then replaceAllUsesWith undef. |
| // This allows ValueHandlers and custom metadata to adjust itself. |
| if (!CS.getInstruction()->getType()->isVoidTy()) |
| ReplaceInstUsesWith(*CS.getInstruction(), |
| UndefValue::get(CS.getInstruction()->getType())); |
| |
| if (isa<InvokeInst>(CS.getInstruction())) { |
| // Can't remove an invoke because we cannot change the CFG. |
| return nullptr; |
| } |
| |
| // This instruction is not reachable, just remove it. We insert a store to |
| // undef so that we know that this code is not reachable, despite the fact |
| // that we can't modify the CFG here. |
| new StoreInst(ConstantInt::getTrue(Callee->getContext()), |
| UndefValue::get(Type::getInt1PtrTy(Callee->getContext())), |
| CS.getInstruction()); |
| |
| return EraseInstFromFunction(*CS.getInstruction()); |
| } |
| |
| if (IntrinsicInst *II = FindInitTrampoline(Callee)) |
| return transformCallThroughTrampoline(CS, II); |
| |
| PointerType *PTy = cast<PointerType>(Callee->getType()); |
| FunctionType *FTy = cast<FunctionType>(PTy->getElementType()); |
| if (FTy->isVarArg()) { |
| int ix = FTy->getNumParams(); |
| // See if we can optimize any arguments passed through the varargs area of |
| // the call. |
| for (CallSite::arg_iterator I = CS.arg_begin() + FTy->getNumParams(), |
| E = CS.arg_end(); I != E; ++I, ++ix) { |
| CastInst *CI = dyn_cast<CastInst>(*I); |
| if (CI && isSafeToEliminateVarargsCast(CS, DL, CI, ix)) { |
| *I = CI->getOperand(0); |
| Changed = true; |
| } |
| } |
| } |
| |
| if (isa<InlineAsm>(Callee) && !CS.doesNotThrow()) { |
| // Inline asm calls cannot throw - mark them 'nounwind'. |
| CS.setDoesNotThrow(); |
| Changed = true; |
| } |
| |
| // Try to optimize the call if possible, we require DataLayout for most of |
| // this. None of these calls are seen as possibly dead so go ahead and |
| // delete the instruction now. |
| if (CallInst *CI = dyn_cast<CallInst>(CS.getInstruction())) { |
| Instruction *I = tryOptimizeCall(CI); |
| // If we changed something return the result, etc. Otherwise let |
| // the fallthrough check. |
| if (I) return EraseInstFromFunction(*I); |
| } |
| |
| return Changed ? CS.getInstruction() : nullptr; |
| } |
| |
| // transformConstExprCastCall - If the callee is a constexpr cast of a function, |
| // attempt to move the cast to the arguments of the call/invoke. |
| // |
| bool InstCombiner::transformConstExprCastCall(CallSite CS) { |
| Function *Callee = |
| dyn_cast<Function>(CS.getCalledValue()->stripPointerCasts()); |
| if (!Callee) |
| return false; |
| // The prototype of thunks are a lie, don't try to directly call such |
| // functions. |
| if (Callee->hasFnAttribute("thunk")) |
| return false; |
| Instruction *Caller = CS.getInstruction(); |
| const AttributeSet &CallerPAL = CS.getAttributes(); |
| |
| // Okay, this is a cast from a function to a different type. Unless doing so |
| // would cause a type conversion of one of our arguments, change this call to |
| // be a direct call with arguments casted to the appropriate types. |
| // |
| FunctionType *FT = Callee->getFunctionType(); |
| Type *OldRetTy = Caller->getType(); |
| Type *NewRetTy = FT->getReturnType(); |
| |
| // Check to see if we are changing the return type... |
| if (OldRetTy != NewRetTy) { |
| |
| if (NewRetTy->isStructTy()) |
| return false; // TODO: Handle multiple return values. |
| |
| if (!CastInst::isBitOrNoopPointerCastable(NewRetTy, OldRetTy, DL)) { |
| if (Callee->isDeclaration()) |
| return false; // Cannot transform this return value. |
| |
| if (!Caller->use_empty() && |
| // void -> non-void is handled specially |
| !NewRetTy->isVoidTy()) |
| return false; // Cannot transform this return value. |
| } |
| |
| if (!CallerPAL.isEmpty() && !Caller->use_empty()) { |
| AttrBuilder RAttrs(CallerPAL, AttributeSet::ReturnIndex); |
| if (RAttrs.overlaps(AttributeFuncs::typeIncompatible(NewRetTy))) |
| return false; // Attribute not compatible with transformed value. |
| } |
| |
| // If the callsite is an invoke instruction, and the return value is used by |
| // a PHI node in a successor, we cannot change the return type of the call |
| // because there is no place to put the cast instruction (without breaking |
| // the critical edge). Bail out in this case. |
| if (!Caller->use_empty()) |
| if (InvokeInst *II = dyn_cast<InvokeInst>(Caller)) |
| for (User *U : II->users()) |
| if (PHINode *PN = dyn_cast<PHINode>(U)) |
| if (PN->getParent() == II->getNormalDest() || |
| PN->getParent() == II->getUnwindDest()) |
| return false; |
| } |
| |
| unsigned NumActualArgs = CS.arg_size(); |
| unsigned NumCommonArgs = std::min(FT->getNumParams(), NumActualArgs); |
| |
| // Prevent us turning: |
| // declare void @takes_i32_inalloca(i32* inalloca) |
| // call void bitcast (void (i32*)* @takes_i32_inalloca to void (i32)*)(i32 0) |
| // |
| // into: |
| // call void @takes_i32_inalloca(i32* null) |
| // |
| // Similarly, avoid folding away bitcasts of byval calls. |
| if (Callee->getAttributes().hasAttrSomewhere(Attribute::InAlloca) || |
| Callee->getAttributes().hasAttrSomewhere(Attribute::ByVal)) |
| return false; |
| |
| CallSite::arg_iterator AI = CS.arg_begin(); |
| for (unsigned i = 0, e = NumCommonArgs; i != e; ++i, ++AI) { |
| Type *ParamTy = FT->getParamType(i); |
| Type *ActTy = (*AI)->getType(); |
| |
| if (!CastInst::isBitOrNoopPointerCastable(ActTy, ParamTy, DL)) |
| return false; // Cannot transform this parameter value. |
| |
| if (AttrBuilder(CallerPAL.getParamAttributes(i + 1), i + 1). |
| overlaps(AttributeFuncs::typeIncompatible(ParamTy))) |
| return false; // Attribute not compatible with transformed value. |
| |
| if (CS.isInAllocaArgument(i)) |
| return false; // Cannot transform to and from inalloca. |
| |
| // If the parameter is passed as a byval argument, then we have to have a |
| // sized type and the sized type has to have the same size as the old type. |
| if (ParamTy != ActTy && |
| CallerPAL.getParamAttributes(i + 1).hasAttribute(i + 1, |
| Attribute::ByVal)) { |
| PointerType *ParamPTy = dyn_cast<PointerType>(ParamTy); |
| if (!ParamPTy || !ParamPTy->getElementType()->isSized()) |
| return false; |
| |
| Type *CurElTy = ActTy->getPointerElementType(); |
| if (DL.getTypeAllocSize(CurElTy) != |
| DL.getTypeAllocSize(ParamPTy->getElementType())) |
| return false; |
| } |
| } |
| |
| if (Callee->isDeclaration()) { |
| // Do not delete arguments unless we have a function body. |
| if (FT->getNumParams() < NumActualArgs && !FT->isVarArg()) |
| return false; |
| |
| // If the callee is just a declaration, don't change the varargsness of the |
| // call. We don't want to introduce a varargs call where one doesn't |
| // already exist. |
| PointerType *APTy = cast<PointerType>(CS.getCalledValue()->getType()); |
| if (FT->isVarArg()!=cast<FunctionType>(APTy->getElementType())->isVarArg()) |
| return false; |
| |
| // If both the callee and the cast type are varargs, we still have to make |
| // sure the number of fixed parameters are the same or we have the same |
| // ABI issues as if we introduce a varargs call. |
| if (FT->isVarArg() && |
| cast<FunctionType>(APTy->getElementType())->isVarArg() && |
| FT->getNumParams() != |
| cast<FunctionType>(APTy->getElementType())->getNumParams()) |
| return false; |
| } |
| |
| if (FT->getNumParams() < NumActualArgs && FT->isVarArg() && |
| !CallerPAL.isEmpty()) |
| // In this case we have more arguments than the new function type, but we |
| // won't be dropping them. Check that these extra arguments have attributes |
| // that are compatible with being a vararg call argument. |
| for (unsigned i = CallerPAL.getNumSlots(); i; --i) { |
| unsigned Index = CallerPAL.getSlotIndex(i - 1); |
| if (Index <= FT->getNumParams()) |
| break; |
| |
| // Check if it has an attribute that's incompatible with varargs. |
| AttributeSet PAttrs = CallerPAL.getSlotAttributes(i - 1); |
| if (PAttrs.hasAttribute(Index, Attribute::StructRet)) |
| return false; |
| } |
| |
| |
| // Okay, we decided that this is a safe thing to do: go ahead and start |
| // inserting cast instructions as necessary. |
| std::vector<Value*> Args; |
| Args.reserve(NumActualArgs); |
| SmallVector<AttributeSet, 8> attrVec; |
| attrVec.reserve(NumCommonArgs); |
| |
| // Get any return attributes. |
| AttrBuilder RAttrs(CallerPAL, AttributeSet::ReturnIndex); |
| |
| // If the return value is not being used, the type may not be compatible |
| // with the existing attributes. Wipe out any problematic attributes. |
| RAttrs.remove(AttributeFuncs::typeIncompatible(NewRetTy)); |
| |
| // Add the new return attributes. |
| if (RAttrs.hasAttributes()) |
| attrVec.push_back(AttributeSet::get(Caller->getContext(), |
| AttributeSet::ReturnIndex, RAttrs)); |
| |
| AI = CS.arg_begin(); |
| for (unsigned i = 0; i != NumCommonArgs; ++i, ++AI) { |
| Type *ParamTy = FT->getParamType(i); |
| |
| if ((*AI)->getType() == ParamTy) { |
| Args.push_back(*AI); |
| } else { |
| Args.push_back(Builder->CreateBitOrPointerCast(*AI, ParamTy)); |
| } |
| |
| // Add any parameter attributes. |
| AttrBuilder PAttrs(CallerPAL.getParamAttributes(i + 1), i + 1); |
| if (PAttrs.hasAttributes()) |
| attrVec.push_back(AttributeSet::get(Caller->getContext(), i + 1, |
| PAttrs)); |
| } |
| |
| // If the function takes more arguments than the call was taking, add them |
| // now. |
| for (unsigned i = NumCommonArgs; i != FT->getNumParams(); ++i) |
| Args.push_back(Constant::getNullValue(FT->getParamType(i))); |
| |
| // If we are removing arguments to the function, emit an obnoxious warning. |
| if (FT->getNumParams() < NumActualArgs) { |
| // TODO: if (!FT->isVarArg()) this call may be unreachable. PR14722 |
| if (FT->isVarArg()) { |
| // Add all of the arguments in their promoted form to the arg list. |
| for (unsigned i = FT->getNumParams(); i != NumActualArgs; ++i, ++AI) { |
| Type *PTy = getPromotedType((*AI)->getType()); |
| if (PTy != (*AI)->getType()) { |
| // Must promote to pass through va_arg area! |
| Instruction::CastOps opcode = |
| CastInst::getCastOpcode(*AI, false, PTy, false); |
| Args.push_back(Builder->CreateCast(opcode, *AI, PTy)); |
| } else { |
| Args.push_back(*AI); |
| } |
| |
| // Add any parameter attributes. |
| AttrBuilder PAttrs(CallerPAL.getParamAttributes(i + 1), i + 1); |
| if (PAttrs.hasAttributes()) |
| attrVec.push_back(AttributeSet::get(FT->getContext(), i + 1, |
| PAttrs)); |
| } |
| } |
| } |
| |
| AttributeSet FnAttrs = CallerPAL.getFnAttributes(); |
| if (CallerPAL.hasAttributes(AttributeSet::FunctionIndex)) |
| attrVec.push_back(AttributeSet::get(Callee->getContext(), FnAttrs)); |
| |
| if (NewRetTy->isVoidTy()) |
| Caller->setName(""); // Void type should not have a name. |
| |
| const AttributeSet &NewCallerPAL = AttributeSet::get(Callee->getContext(), |
| attrVec); |
| |
| Instruction *NC; |
| if (InvokeInst *II = dyn_cast<InvokeInst>(Caller)) { |
| NC = Builder->CreateInvoke(Callee, II->getNormalDest(), |
| II->getUnwindDest(), Args); |
| NC->takeName(II); |
| cast<InvokeInst>(NC)->setCallingConv(II->getCallingConv()); |
| cast<InvokeInst>(NC)->setAttributes(NewCallerPAL); |
| } else { |
| CallInst *CI = cast<CallInst>(Caller); |
| NC = Builder->CreateCall(Callee, Args); |
| NC->takeName(CI); |
| if (CI->isTailCall()) |
| cast<CallInst>(NC)->setTailCall(); |
| cast<CallInst>(NC)->setCallingConv(CI->getCallingConv()); |
| cast<CallInst>(NC)->setAttributes(NewCallerPAL); |
| } |
| |
| // Insert a cast of the return type as necessary. |
| Value *NV = NC; |
| if (OldRetTy != NV->getType() && !Caller->use_empty()) { |
| if (!NV->getType()->isVoidTy()) { |
| NV = NC = CastInst::CreateBitOrPointerCast(NC, OldRetTy); |
| NC->setDebugLoc(Caller->getDebugLoc()); |
| |
| // If this is an invoke instruction, we should insert it after the first |
| // non-phi, instruction in the normal successor block. |
| if (InvokeInst *II = dyn_cast<InvokeInst>(Caller)) { |
| BasicBlock::iterator I = II->getNormalDest()->getFirstInsertionPt(); |
| InsertNewInstBefore(NC, *I); |
| } else { |
| // Otherwise, it's a call, just insert cast right after the call. |
| InsertNewInstBefore(NC, *Caller); |
| } |
| Worklist.AddUsersToWorkList(*Caller); |
| } else { |
| NV = UndefValue::get(Caller->getType()); |
| } |
| } |
| |
| if (!Caller->use_empty()) |
| ReplaceInstUsesWith(*Caller, NV); |
| else if (Caller->hasValueHandle()) { |
| if (OldRetTy == NV->getType()) |
| ValueHandleBase::ValueIsRAUWd(Caller, NV); |
| else |
| // We cannot call ValueIsRAUWd with a different type, and the |
| // actual tracked value will disappear. |
| ValueHandleBase::ValueIsDeleted(Caller); |
| } |
| |
| EraseInstFromFunction(*Caller); |
| return true; |
| } |
| |
| // transformCallThroughTrampoline - Turn a call to a function created by |
| // init_trampoline / adjust_trampoline intrinsic pair into a direct call to the |
| // underlying function. |
| // |
| Instruction * |
| InstCombiner::transformCallThroughTrampoline(CallSite CS, |
| IntrinsicInst *Tramp) { |
| Value *Callee = CS.getCalledValue(); |
| PointerType *PTy = cast<PointerType>(Callee->getType()); |
| FunctionType *FTy = cast<FunctionType>(PTy->getElementType()); |
| const AttributeSet &Attrs = CS.getAttributes(); |
| |
| // If the call already has the 'nest' attribute somewhere then give up - |
| // otherwise 'nest' would occur twice after splicing in the chain. |
| if (Attrs.hasAttrSomewhere(Attribute::Nest)) |
| return nullptr; |
| |
| assert(Tramp && |
| "transformCallThroughTrampoline called with incorrect CallSite."); |
| |
| Function *NestF =cast<Function>(Tramp->getArgOperand(1)->stripPointerCasts()); |
| PointerType *NestFPTy = cast<PointerType>(NestF->getType()); |
| FunctionType *NestFTy = cast<FunctionType>(NestFPTy->getElementType()); |
| |
| const AttributeSet &NestAttrs = NestF->getAttributes(); |
| if (!NestAttrs.isEmpty()) { |
| unsigned NestIdx = 1; |
| Type *NestTy = nullptr; |
| AttributeSet NestAttr; |
| |
| // Look for a parameter marked with the 'nest' attribute. |
| for (FunctionType::param_iterator I = NestFTy->param_begin(), |
| E = NestFTy->param_end(); I != E; ++NestIdx, ++I) |
| if (NestAttrs.hasAttribute(NestIdx, Attribute::Nest)) { |
| // Record the parameter type and any other attributes. |
| NestTy = *I; |
| NestAttr = NestAttrs.getParamAttributes(NestIdx); |
| break; |
| } |
| |
| if (NestTy) { |
| Instruction *Caller = CS.getInstruction(); |
| std::vector<Value*> NewArgs; |
| NewArgs.reserve(CS.arg_size() + 1); |
| |
| SmallVector<AttributeSet, 8> NewAttrs; |
| NewAttrs.reserve(Attrs.getNumSlots() + 1); |
| |
| // Insert the nest argument into the call argument list, which may |
| // mean appending it. Likewise for attributes. |
| |
| // Add any result attributes. |
| if (Attrs.hasAttributes(AttributeSet::ReturnIndex)) |
| NewAttrs.push_back(AttributeSet::get(Caller->getContext(), |
| Attrs.getRetAttributes())); |
| |
| { |
| unsigned Idx = 1; |
| CallSite::arg_iterator I = CS.arg_begin(), E = CS.arg_end(); |
| do { |
| if (Idx == NestIdx) { |
| // Add the chain argument and attributes. |
| Value *NestVal = Tramp->getArgOperand(2); |
| if (NestVal->getType() != NestTy) |
| NestVal = Builder->CreateBitCast(NestVal, NestTy, "nest"); |
| NewArgs.push_back(NestVal); |
| NewAttrs.push_back(AttributeSet::get(Caller->getContext(), |
| NestAttr)); |
| } |
| |
| if (I == E) |
| break; |
| |
| // Add the original argument and attributes. |
| NewArgs.push_back(*I); |
| AttributeSet Attr = Attrs.getParamAttributes(Idx); |
| if (Attr.hasAttributes(Idx)) { |
| AttrBuilder B(Attr, Idx); |
| NewAttrs.push_back(AttributeSet::get(Caller->getContext(), |
| Idx + (Idx >= NestIdx), B)); |
| } |
| |
| ++Idx, ++I; |
| } while (1); |
| } |
| |
| // Add any function attributes. |
| if (Attrs.hasAttributes(AttributeSet::FunctionIndex)) |
| NewAttrs.push_back(AttributeSet::get(FTy->getContext(), |
| Attrs.getFnAttributes())); |
| |
| // The trampoline may have been bitcast to a bogus type (FTy). |
| // Handle this by synthesizing a new function type, equal to FTy |
| // with the chain parameter inserted. |
| |
| std::vector<Type*> NewTypes; |
| NewTypes.reserve(FTy->getNumParams()+1); |
| |
| // Insert the chain's type into the list of parameter types, which may |
| // mean appending it. |
| { |
| unsigned Idx = 1; |
| FunctionType::param_iterator I = FTy->param_begin(), |
| E = FTy->param_end(); |
| |
| do { |
| if (Idx == NestIdx) |
| // Add the chain's type. |
| NewTypes.push_back(NestTy); |
| |
| if (I == E) |
| break; |
| |
| // Add the original type. |
| NewTypes.push_back(*I); |
| |
| ++Idx, ++I; |
| } while (1); |
| } |
| |
| // Replace the trampoline call with a direct call. Let the generic |
| // code sort out any function type mismatches. |
| FunctionType *NewFTy = FunctionType::get(FTy->getReturnType(), NewTypes, |
| FTy->isVarArg()); |
| Constant *NewCallee = |
| NestF->getType() == PointerType::getUnqual(NewFTy) ? |
| NestF : ConstantExpr::getBitCast(NestF, |
| PointerType::getUnqual(NewFTy)); |
| const AttributeSet &NewPAL = |
| AttributeSet::get(FTy->getContext(), NewAttrs); |
| |
| Instruction *NewCaller; |
| if (InvokeInst *II = dyn_cast<InvokeInst>(Caller)) { |
| NewCaller = InvokeInst::Create(NewCallee, |
| II->getNormalDest(), II->getUnwindDest(), |
| NewArgs); |
| cast<InvokeInst>(NewCaller)->setCallingConv(II->getCallingConv()); |
| cast<InvokeInst>(NewCaller)->setAttributes(NewPAL); |
| } else { |
| NewCaller = CallInst::Create(NewCallee, NewArgs); |
| if (cast<CallInst>(Caller)->isTailCall()) |
| cast<CallInst>(NewCaller)->setTailCall(); |
| cast<CallInst>(NewCaller)-> |
| setCallingConv(cast<CallInst>(Caller)->getCallingConv()); |
| cast<CallInst>(NewCaller)->setAttributes(NewPAL); |
| } |
| |
| return NewCaller; |
| } |
| } |
| |
| // Replace the trampoline call with a direct call. Since there is no 'nest' |
| // parameter, there is no need to adjust the argument list. Let the generic |
| // code sort out any function type mismatches. |
| Constant *NewCallee = |
| NestF->getType() == PTy ? NestF : |
| ConstantExpr::getBitCast(NestF, PTy); |
| CS.setCalledFunction(NewCallee); |
| return CS.getInstruction(); |
| } |