449 lines
19 KiB
C++
449 lines
19 KiB
C++
//===- LowerMemIntrinsics.cpp ----------------------------------*- C++ -*--===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Transforms/Utils/LowerMemIntrinsics.h"
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#include "llvm/Analysis/TargetTransformInfo.h"
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#include "llvm/IR/IRBuilder.h"
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#include "llvm/IR/IntrinsicInst.h"
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#include "llvm/Transforms/Utils/BasicBlockUtils.h"
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using namespace llvm;
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static unsigned getLoopOperandSizeInBytes(Type *Type) {
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if (VectorType *VTy = dyn_cast<VectorType>(Type)) {
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return VTy->getBitWidth() / 8;
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}
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return Type->getPrimitiveSizeInBits() / 8;
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}
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void llvm::createMemCpyLoopKnownSize(Instruction *InsertBefore, Value *SrcAddr,
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Value *DstAddr, ConstantInt *CopyLen,
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unsigned SrcAlign, unsigned DestAlign,
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bool SrcIsVolatile, bool DstIsVolatile,
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const TargetTransformInfo &TTI) {
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// No need to expand zero length copies.
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if (CopyLen->isZero())
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return;
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BasicBlock *PreLoopBB = InsertBefore->getParent();
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BasicBlock *PostLoopBB = nullptr;
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Function *ParentFunc = PreLoopBB->getParent();
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LLVMContext &Ctx = PreLoopBB->getContext();
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Type *TypeOfCopyLen = CopyLen->getType();
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Type *LoopOpType =
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TTI.getMemcpyLoopLoweringType(Ctx, CopyLen, SrcAlign, DestAlign);
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unsigned LoopOpSize = getLoopOperandSizeInBytes(LoopOpType);
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uint64_t LoopEndCount = CopyLen->getZExtValue() / LoopOpSize;
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unsigned SrcAS = cast<PointerType>(SrcAddr->getType())->getAddressSpace();
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unsigned DstAS = cast<PointerType>(DstAddr->getType())->getAddressSpace();
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if (LoopEndCount != 0) {
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// Split
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PostLoopBB = PreLoopBB->splitBasicBlock(InsertBefore, "memcpy-split");
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BasicBlock *LoopBB =
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BasicBlock::Create(Ctx, "load-store-loop", ParentFunc, PostLoopBB);
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PreLoopBB->getTerminator()->setSuccessor(0, LoopBB);
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IRBuilder<> PLBuilder(PreLoopBB->getTerminator());
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// Cast the Src and Dst pointers to pointers to the loop operand type (if
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// needed).
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PointerType *SrcOpType = PointerType::get(LoopOpType, SrcAS);
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PointerType *DstOpType = PointerType::get(LoopOpType, DstAS);
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if (SrcAddr->getType() != SrcOpType) {
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SrcAddr = PLBuilder.CreateBitCast(SrcAddr, SrcOpType);
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}
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if (DstAddr->getType() != DstOpType) {
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DstAddr = PLBuilder.CreateBitCast(DstAddr, DstOpType);
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}
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IRBuilder<> LoopBuilder(LoopBB);
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PHINode *LoopIndex = LoopBuilder.CreatePHI(TypeOfCopyLen, 2, "loop-index");
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LoopIndex->addIncoming(ConstantInt::get(TypeOfCopyLen, 0U), PreLoopBB);
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// Loop Body
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Value *SrcGEP =
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LoopBuilder.CreateInBoundsGEP(LoopOpType, SrcAddr, LoopIndex);
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Value *Load = LoopBuilder.CreateLoad(SrcGEP, SrcIsVolatile);
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Value *DstGEP =
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LoopBuilder.CreateInBoundsGEP(LoopOpType, DstAddr, LoopIndex);
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LoopBuilder.CreateStore(Load, DstGEP, DstIsVolatile);
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Value *NewIndex =
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LoopBuilder.CreateAdd(LoopIndex, ConstantInt::get(TypeOfCopyLen, 1U));
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LoopIndex->addIncoming(NewIndex, LoopBB);
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// Create the loop branch condition.
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Constant *LoopEndCI = ConstantInt::get(TypeOfCopyLen, LoopEndCount);
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LoopBuilder.CreateCondBr(LoopBuilder.CreateICmpULT(NewIndex, LoopEndCI),
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LoopBB, PostLoopBB);
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}
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uint64_t BytesCopied = LoopEndCount * LoopOpSize;
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uint64_t RemainingBytes = CopyLen->getZExtValue() - BytesCopied;
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if (RemainingBytes) {
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IRBuilder<> RBuilder(PostLoopBB ? PostLoopBB->getFirstNonPHI()
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: InsertBefore);
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// Update the alignment based on the copy size used in the loop body.
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SrcAlign = std::min(SrcAlign, LoopOpSize);
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DestAlign = std::min(DestAlign, LoopOpSize);
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SmallVector<Type *, 5> RemainingOps;
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TTI.getMemcpyLoopResidualLoweringType(RemainingOps, Ctx, RemainingBytes,
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SrcAlign, DestAlign);
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for (auto OpTy : RemainingOps) {
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// Calaculate the new index
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unsigned OperandSize = getLoopOperandSizeInBytes(OpTy);
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uint64_t GepIndex = BytesCopied / OperandSize;
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assert(GepIndex * OperandSize == BytesCopied &&
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"Division should have no Remainder!");
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// Cast source to operand type and load
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PointerType *SrcPtrType = PointerType::get(OpTy, SrcAS);
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Value *CastedSrc = SrcAddr->getType() == SrcPtrType
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? SrcAddr
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: RBuilder.CreateBitCast(SrcAddr, SrcPtrType);
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Value *SrcGEP = RBuilder.CreateInBoundsGEP(
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OpTy, CastedSrc, ConstantInt::get(TypeOfCopyLen, GepIndex));
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Value *Load = RBuilder.CreateLoad(SrcGEP, SrcIsVolatile);
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// Cast destination to operand type and store.
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PointerType *DstPtrType = PointerType::get(OpTy, DstAS);
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Value *CastedDst = DstAddr->getType() == DstPtrType
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? DstAddr
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: RBuilder.CreateBitCast(DstAddr, DstPtrType);
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Value *DstGEP = RBuilder.CreateInBoundsGEP(
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OpTy, CastedDst, ConstantInt::get(TypeOfCopyLen, GepIndex));
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RBuilder.CreateStore(Load, DstGEP, DstIsVolatile);
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BytesCopied += OperandSize;
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}
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}
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assert(BytesCopied == CopyLen->getZExtValue() &&
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"Bytes copied should match size in the call!");
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}
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void llvm::createMemCpyLoopUnknownSize(Instruction *InsertBefore,
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Value *SrcAddr, Value *DstAddr,
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Value *CopyLen, unsigned SrcAlign,
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unsigned DestAlign, bool SrcIsVolatile,
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bool DstIsVolatile,
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const TargetTransformInfo &TTI) {
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BasicBlock *PreLoopBB = InsertBefore->getParent();
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BasicBlock *PostLoopBB =
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PreLoopBB->splitBasicBlock(InsertBefore, "post-loop-memcpy-expansion");
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Function *ParentFunc = PreLoopBB->getParent();
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LLVMContext &Ctx = PreLoopBB->getContext();
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Type *LoopOpType =
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TTI.getMemcpyLoopLoweringType(Ctx, CopyLen, SrcAlign, DestAlign);
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unsigned LoopOpSize = getLoopOperandSizeInBytes(LoopOpType);
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IRBuilder<> PLBuilder(PreLoopBB->getTerminator());
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unsigned SrcAS = cast<PointerType>(SrcAddr->getType())->getAddressSpace();
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unsigned DstAS = cast<PointerType>(DstAddr->getType())->getAddressSpace();
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PointerType *SrcOpType = PointerType::get(LoopOpType, SrcAS);
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PointerType *DstOpType = PointerType::get(LoopOpType, DstAS);
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if (SrcAddr->getType() != SrcOpType) {
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SrcAddr = PLBuilder.CreateBitCast(SrcAddr, SrcOpType);
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}
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if (DstAddr->getType() != DstOpType) {
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DstAddr = PLBuilder.CreateBitCast(DstAddr, DstOpType);
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}
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// Calculate the loop trip count, and remaining bytes to copy after the loop.
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Type *CopyLenType = CopyLen->getType();
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IntegerType *ILengthType = dyn_cast<IntegerType>(CopyLenType);
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assert(ILengthType &&
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"expected size argument to memcpy to be an integer type!");
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Type *Int8Type = Type::getInt8Ty(Ctx);
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bool LoopOpIsInt8 = LoopOpType == Int8Type;
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ConstantInt *CILoopOpSize = ConstantInt::get(ILengthType, LoopOpSize);
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Value *RuntimeLoopCount = LoopOpIsInt8 ?
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CopyLen :
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PLBuilder.CreateUDiv(CopyLen, CILoopOpSize);
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BasicBlock *LoopBB =
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BasicBlock::Create(Ctx, "loop-memcpy-expansion", ParentFunc, PostLoopBB);
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IRBuilder<> LoopBuilder(LoopBB);
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PHINode *LoopIndex = LoopBuilder.CreatePHI(CopyLenType, 2, "loop-index");
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LoopIndex->addIncoming(ConstantInt::get(CopyLenType, 0U), PreLoopBB);
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Value *SrcGEP = LoopBuilder.CreateInBoundsGEP(LoopOpType, SrcAddr, LoopIndex);
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Value *Load = LoopBuilder.CreateLoad(SrcGEP, SrcIsVolatile);
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Value *DstGEP = LoopBuilder.CreateInBoundsGEP(LoopOpType, DstAddr, LoopIndex);
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LoopBuilder.CreateStore(Load, DstGEP, DstIsVolatile);
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Value *NewIndex =
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LoopBuilder.CreateAdd(LoopIndex, ConstantInt::get(CopyLenType, 1U));
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LoopIndex->addIncoming(NewIndex, LoopBB);
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if (!LoopOpIsInt8) {
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// Add in the
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Value *RuntimeResidual = PLBuilder.CreateURem(CopyLen, CILoopOpSize);
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Value *RuntimeBytesCopied = PLBuilder.CreateSub(CopyLen, RuntimeResidual);
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// Loop body for the residual copy.
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BasicBlock *ResLoopBB = BasicBlock::Create(Ctx, "loop-memcpy-residual",
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PreLoopBB->getParent(),
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PostLoopBB);
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// Residual loop header.
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BasicBlock *ResHeaderBB = BasicBlock::Create(
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Ctx, "loop-memcpy-residual-header", PreLoopBB->getParent(), nullptr);
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// Need to update the pre-loop basic block to branch to the correct place.
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// branch to the main loop if the count is non-zero, branch to the residual
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// loop if the copy size is smaller then 1 iteration of the main loop but
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// non-zero and finally branch to after the residual loop if the memcpy
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// size is zero.
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ConstantInt *Zero = ConstantInt::get(ILengthType, 0U);
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PLBuilder.CreateCondBr(PLBuilder.CreateICmpNE(RuntimeLoopCount, Zero),
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LoopBB, ResHeaderBB);
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PreLoopBB->getTerminator()->eraseFromParent();
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LoopBuilder.CreateCondBr(
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LoopBuilder.CreateICmpULT(NewIndex, RuntimeLoopCount), LoopBB,
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ResHeaderBB);
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// Determine if we need to branch to the residual loop or bypass it.
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IRBuilder<> RHBuilder(ResHeaderBB);
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RHBuilder.CreateCondBr(RHBuilder.CreateICmpNE(RuntimeResidual, Zero),
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ResLoopBB, PostLoopBB);
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// Copy the residual with single byte load/store loop.
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IRBuilder<> ResBuilder(ResLoopBB);
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PHINode *ResidualIndex =
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ResBuilder.CreatePHI(CopyLenType, 2, "residual-loop-index");
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ResidualIndex->addIncoming(Zero, ResHeaderBB);
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Value *SrcAsInt8 =
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ResBuilder.CreateBitCast(SrcAddr, PointerType::get(Int8Type, SrcAS));
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Value *DstAsInt8 =
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ResBuilder.CreateBitCast(DstAddr, PointerType::get(Int8Type, DstAS));
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Value *FullOffset = ResBuilder.CreateAdd(RuntimeBytesCopied, ResidualIndex);
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Value *SrcGEP =
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ResBuilder.CreateInBoundsGEP(Int8Type, SrcAsInt8, FullOffset);
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Value *Load = ResBuilder.CreateLoad(SrcGEP, SrcIsVolatile);
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Value *DstGEP =
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ResBuilder.CreateInBoundsGEP(Int8Type, DstAsInt8, FullOffset);
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ResBuilder.CreateStore(Load, DstGEP, DstIsVolatile);
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Value *ResNewIndex =
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ResBuilder.CreateAdd(ResidualIndex, ConstantInt::get(CopyLenType, 1U));
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ResidualIndex->addIncoming(ResNewIndex, ResLoopBB);
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// Create the loop branch condition.
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ResBuilder.CreateCondBr(
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ResBuilder.CreateICmpULT(ResNewIndex, RuntimeResidual), ResLoopBB,
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PostLoopBB);
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} else {
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// In this case the loop operand type was a byte, and there is no need for a
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// residual loop to copy the remaining memory after the main loop.
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// We do however need to patch up the control flow by creating the
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// terminators for the preloop block and the memcpy loop.
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ConstantInt *Zero = ConstantInt::get(ILengthType, 0U);
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PLBuilder.CreateCondBr(PLBuilder.CreateICmpNE(RuntimeLoopCount, Zero),
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LoopBB, PostLoopBB);
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PreLoopBB->getTerminator()->eraseFromParent();
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LoopBuilder.CreateCondBr(
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LoopBuilder.CreateICmpULT(NewIndex, RuntimeLoopCount), LoopBB,
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PostLoopBB);
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}
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}
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// Lower memmove to IR. memmove is required to correctly copy overlapping memory
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// regions; therefore, it has to check the relative positions of the source and
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// destination pointers and choose the copy direction accordingly.
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//
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// The code below is an IR rendition of this C function:
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//
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// void* memmove(void* dst, const void* src, size_t n) {
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// unsigned char* d = dst;
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// const unsigned char* s = src;
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// if (s < d) {
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// // copy backwards
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// while (n--) {
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// d[n] = s[n];
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// }
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// } else {
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// // copy forward
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// for (size_t i = 0; i < n; ++i) {
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// d[i] = s[i];
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// }
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// }
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// return dst;
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// }
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static void createMemMoveLoop(Instruction *InsertBefore,
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Value *SrcAddr, Value *DstAddr, Value *CopyLen,
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unsigned SrcAlign, unsigned DestAlign,
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bool SrcIsVolatile, bool DstIsVolatile) {
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Type *TypeOfCopyLen = CopyLen->getType();
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BasicBlock *OrigBB = InsertBefore->getParent();
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Function *F = OrigBB->getParent();
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// Create the a comparison of src and dst, based on which we jump to either
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// the forward-copy part of the function (if src >= dst) or the backwards-copy
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// part (if src < dst).
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// SplitBlockAndInsertIfThenElse conveniently creates the basic if-then-else
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// structure. Its block terminators (unconditional branches) are replaced by
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// the appropriate conditional branches when the loop is built.
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ICmpInst *PtrCompare = new ICmpInst(InsertBefore, ICmpInst::ICMP_ULT,
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SrcAddr, DstAddr, "compare_src_dst");
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TerminatorInst *ThenTerm, *ElseTerm;
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SplitBlockAndInsertIfThenElse(PtrCompare, InsertBefore, &ThenTerm,
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&ElseTerm);
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// Each part of the function consists of two blocks:
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// copy_backwards: used to skip the loop when n == 0
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// copy_backwards_loop: the actual backwards loop BB
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// copy_forward: used to skip the loop when n == 0
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// copy_forward_loop: the actual forward loop BB
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BasicBlock *CopyBackwardsBB = ThenTerm->getParent();
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CopyBackwardsBB->setName("copy_backwards");
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BasicBlock *CopyForwardBB = ElseTerm->getParent();
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CopyForwardBB->setName("copy_forward");
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BasicBlock *ExitBB = InsertBefore->getParent();
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ExitBB->setName("memmove_done");
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// Initial comparison of n == 0 that lets us skip the loops altogether. Shared
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// between both backwards and forward copy clauses.
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ICmpInst *CompareN =
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new ICmpInst(OrigBB->getTerminator(), ICmpInst::ICMP_EQ, CopyLen,
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ConstantInt::get(TypeOfCopyLen, 0), "compare_n_to_0");
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// Copying backwards.
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BasicBlock *LoopBB =
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BasicBlock::Create(F->getContext(), "copy_backwards_loop", F, CopyForwardBB);
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IRBuilder<> LoopBuilder(LoopBB);
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PHINode *LoopPhi = LoopBuilder.CreatePHI(TypeOfCopyLen, 0);
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Value *IndexPtr = LoopBuilder.CreateSub(
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LoopPhi, ConstantInt::get(TypeOfCopyLen, 1), "index_ptr");
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Value *Element = LoopBuilder.CreateLoad(
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LoopBuilder.CreateInBoundsGEP(SrcAddr, IndexPtr), "element");
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LoopBuilder.CreateStore(Element,
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LoopBuilder.CreateInBoundsGEP(DstAddr, IndexPtr));
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LoopBuilder.CreateCondBr(
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LoopBuilder.CreateICmpEQ(IndexPtr, ConstantInt::get(TypeOfCopyLen, 0)),
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ExitBB, LoopBB);
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LoopPhi->addIncoming(IndexPtr, LoopBB);
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LoopPhi->addIncoming(CopyLen, CopyBackwardsBB);
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BranchInst::Create(ExitBB, LoopBB, CompareN, ThenTerm);
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ThenTerm->eraseFromParent();
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// Copying forward.
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BasicBlock *FwdLoopBB =
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BasicBlock::Create(F->getContext(), "copy_forward_loop", F, ExitBB);
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IRBuilder<> FwdLoopBuilder(FwdLoopBB);
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PHINode *FwdCopyPhi = FwdLoopBuilder.CreatePHI(TypeOfCopyLen, 0, "index_ptr");
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Value *FwdElement = FwdLoopBuilder.CreateLoad(
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FwdLoopBuilder.CreateInBoundsGEP(SrcAddr, FwdCopyPhi), "element");
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FwdLoopBuilder.CreateStore(
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FwdElement, FwdLoopBuilder.CreateInBoundsGEP(DstAddr, FwdCopyPhi));
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Value *FwdIndexPtr = FwdLoopBuilder.CreateAdd(
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FwdCopyPhi, ConstantInt::get(TypeOfCopyLen, 1), "index_increment");
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FwdLoopBuilder.CreateCondBr(FwdLoopBuilder.CreateICmpEQ(FwdIndexPtr, CopyLen),
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ExitBB, FwdLoopBB);
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FwdCopyPhi->addIncoming(FwdIndexPtr, FwdLoopBB);
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FwdCopyPhi->addIncoming(ConstantInt::get(TypeOfCopyLen, 0), CopyForwardBB);
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BranchInst::Create(ExitBB, FwdLoopBB, CompareN, ElseTerm);
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ElseTerm->eraseFromParent();
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}
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static void createMemSetLoop(Instruction *InsertBefore,
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Value *DstAddr, Value *CopyLen, Value *SetValue,
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unsigned Align, bool IsVolatile) {
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Type *TypeOfCopyLen = CopyLen->getType();
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BasicBlock *OrigBB = InsertBefore->getParent();
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Function *F = OrigBB->getParent();
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BasicBlock *NewBB =
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OrigBB->splitBasicBlock(InsertBefore, "split");
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BasicBlock *LoopBB
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= BasicBlock::Create(F->getContext(), "loadstoreloop", F, NewBB);
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IRBuilder<> Builder(OrigBB->getTerminator());
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// Cast pointer to the type of value getting stored
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unsigned dstAS = cast<PointerType>(DstAddr->getType())->getAddressSpace();
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DstAddr = Builder.CreateBitCast(DstAddr,
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PointerType::get(SetValue->getType(), dstAS));
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Builder.CreateCondBr(
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Builder.CreateICmpEQ(ConstantInt::get(TypeOfCopyLen, 0), CopyLen), NewBB,
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LoopBB);
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OrigBB->getTerminator()->eraseFromParent();
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IRBuilder<> LoopBuilder(LoopBB);
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PHINode *LoopIndex = LoopBuilder.CreatePHI(TypeOfCopyLen, 0);
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LoopIndex->addIncoming(ConstantInt::get(TypeOfCopyLen, 0), OrigBB);
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LoopBuilder.CreateStore(
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SetValue,
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LoopBuilder.CreateInBoundsGEP(SetValue->getType(), DstAddr, LoopIndex),
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IsVolatile);
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Value *NewIndex =
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LoopBuilder.CreateAdd(LoopIndex, ConstantInt::get(TypeOfCopyLen, 1));
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LoopIndex->addIncoming(NewIndex, LoopBB);
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LoopBuilder.CreateCondBr(LoopBuilder.CreateICmpULT(NewIndex, CopyLen), LoopBB,
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NewBB);
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}
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void llvm::expandMemCpyAsLoop(MemCpyInst *Memcpy,
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const TargetTransformInfo &TTI) {
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if (ConstantInt *CI = dyn_cast<ConstantInt>(Memcpy->getLength())) {
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createMemCpyLoopKnownSize(/* InsertBefore */ Memcpy,
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/* SrcAddr */ Memcpy->getRawSource(),
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/* DstAddr */ Memcpy->getRawDest(),
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/* CopyLen */ CI,
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/* SrcAlign */ Memcpy->getSourceAlignment(),
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/* DestAlign */ Memcpy->getDestAlignment(),
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/* SrcIsVolatile */ Memcpy->isVolatile(),
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/* DstIsVolatile */ Memcpy->isVolatile(),
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/* TargetTransformInfo */ TTI);
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} else {
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createMemCpyLoopUnknownSize(/* InsertBefore */ Memcpy,
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/* SrcAddr */ Memcpy->getRawSource(),
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/* DstAddr */ Memcpy->getRawDest(),
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/* CopyLen */ Memcpy->getLength(),
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/* SrcAlign */ Memcpy->getSourceAlignment(),
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/* DestAlign */ Memcpy->getDestAlignment(),
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/* SrcIsVolatile */ Memcpy->isVolatile(),
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/* DstIsVolatile */ Memcpy->isVolatile(),
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/* TargetTransfomrInfo */ TTI);
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}
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}
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void llvm::expandMemMoveAsLoop(MemMoveInst *Memmove) {
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createMemMoveLoop(/* InsertBefore */ Memmove,
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/* SrcAddr */ Memmove->getRawSource(),
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/* DstAddr */ Memmove->getRawDest(),
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/* CopyLen */ Memmove->getLength(),
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/* SrcAlign */ Memmove->getSourceAlignment(),
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/* DestAlign */ Memmove->getDestAlignment(),
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/* SrcIsVolatile */ Memmove->isVolatile(),
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/* DstIsVolatile */ Memmove->isVolatile());
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}
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void llvm::expandMemSetAsLoop(MemSetInst *Memset) {
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createMemSetLoop(/* InsertBefore */ Memset,
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/* DstAddr */ Memset->getRawDest(),
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/* CopyLen */ Memset->getLength(),
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/* SetValue */ Memset->getValue(),
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/* Alignment */ Memset->getDestAlignment(),
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Memset->isVolatile());
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}
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