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7bfd5cb7be
teak-llvm/clang/lib/CodeGen/CGBuilder.h
Pete Cooper 7bfd5cb7be Change memcpy/memset/memmove to have dest and source alignments. 
This is a follow on from a similar LLVM commit: r253511.

Note, this was reviewed (and more details are in) http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20151109/312083.html

These intrinsics currently have an explicit alignment argument which is
required to be a constant integer.  It represents the alignment of the
source and dest, and so must be the minimum of those.

This change allows source and dest to each have their own alignments
by using the alignment attribute on their arguments.  The alignment
argument itself is removed.

The only code change to clang is hidden in CGBuilder.h which now passes
both dest and source alignment to IRBuilder, instead of taking the minimum of
dest and source alignments.

Reviewed by Hal Finkel.

llvm-svn: 253512
2015-11-18 22:18:45 +00:00

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//===-- CGBuilder.h - Choose IRBuilder implementation ----------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_LIB_CODEGEN_CGBUILDER_H
#define LLVM_CLANG_LIB_CODEGEN_CGBUILDER_H
#include "llvm/IR/IRBuilder.h"
#include "Address.h"
#include "CodeGenTypeCache.h"
namespace clang {
namespace CodeGen {
class CodeGenFunction;
/// \brief This is an IRBuilder insertion helper that forwards to
/// CodeGenFunction::InsertHelper, which adds necessary metadata to
/// instructions.
template <bool PreserveNames>
class CGBuilderInserter
: protected llvm::IRBuilderDefaultInserter<PreserveNames> {
public:
CGBuilderInserter() = default;
explicit CGBuilderInserter(CodeGenFunction *CGF) : CGF(CGF) {}
protected:
/// \brief This forwards to CodeGenFunction::InsertHelper.
void InsertHelper(llvm::Instruction *I, const llvm::Twine &Name,
llvm::BasicBlock *BB,
llvm::BasicBlock::iterator InsertPt) const;
private:
CodeGenFunction *CGF = nullptr;
};
// Don't preserve names on values in an optimized build.
#ifdef NDEBUG
#define PreserveNames false
#else
#define PreserveNames true
#endif
typedef CGBuilderInserter<PreserveNames> CGBuilderInserterTy;
typedef llvm::IRBuilder<PreserveNames, llvm::ConstantFolder,
CGBuilderInserterTy> CGBuilderBaseTy;
class CGBuilderTy : public CGBuilderBaseTy {
/// Storing a reference to the type cache here makes it a lot easier
/// to build natural-feeling, target-specific IR.
const CodeGenTypeCache &TypeCache;
public:
CGBuilderTy(const CodeGenTypeCache &TypeCache, llvm::LLVMContext &C)
: CGBuilderBaseTy(C), TypeCache(TypeCache) {}
CGBuilderTy(const CodeGenTypeCache &TypeCache,
llvm::LLVMContext &C, const llvm::ConstantFolder &F,
const CGBuilderInserterTy &Inserter)
: CGBuilderBaseTy(C, F, Inserter), TypeCache(TypeCache) {}
CGBuilderTy(const CodeGenTypeCache &TypeCache, llvm::Instruction *I)
: CGBuilderBaseTy(I), TypeCache(TypeCache) {}
CGBuilderTy(const CodeGenTypeCache &TypeCache, llvm::BasicBlock *BB)
: CGBuilderBaseTy(BB), TypeCache(TypeCache) {}
llvm::ConstantInt *getSize(CharUnits N) {
return llvm::ConstantInt::get(TypeCache.SizeTy, N.getQuantity());
}
llvm::ConstantInt *getSize(uint64_t N) {
return llvm::ConstantInt::get(TypeCache.SizeTy, N);
}
// Note that we intentionally hide the CreateLoad APIs that don't
// take an alignment.
llvm::LoadInst *CreateLoad(Address Addr, const llvm::Twine &Name = "") {
return CreateAlignedLoad(Addr.getPointer(),
Addr.getAlignment().getQuantity(),
Name);
}
llvm::LoadInst *CreateLoad(Address Addr, const char *Name) {
// This overload is required to prevent string literals from
// ending up in the IsVolatile overload.
return CreateAlignedLoad(Addr.getPointer(),
Addr.getAlignment().getQuantity(),
Name);
}
llvm::LoadInst *CreateLoad(Address Addr, bool IsVolatile,
const llvm::Twine &Name = "") {
return CreateAlignedLoad(Addr.getPointer(),
Addr.getAlignment().getQuantity(),
IsVolatile,
Name);
}
using CGBuilderBaseTy::CreateAlignedLoad;
llvm::LoadInst *CreateAlignedLoad(llvm::Value *Addr, CharUnits Align,
const llvm::Twine &Name = "") {
return CreateAlignedLoad(Addr, Align.getQuantity(), Name);
}
llvm::LoadInst *CreateAlignedLoad(llvm::Value *Addr, CharUnits Align,
const char *Name) {
return CreateAlignedLoad(Addr, Align.getQuantity(), Name);
}
llvm::LoadInst *CreateAlignedLoad(llvm::Type *Ty, llvm::Value *Addr,
CharUnits Align,
const llvm::Twine &Name = "") {
assert(Addr->getType()->getPointerElementType() == Ty);
return CreateAlignedLoad(Addr, Align.getQuantity(), Name);
}
llvm::LoadInst *CreateAlignedLoad(llvm::Value *Addr, CharUnits Align,
bool IsVolatile,
const llvm::Twine &Name = "") {
return CreateAlignedLoad(Addr, Align.getQuantity(), IsVolatile, Name);
}
// Note that we intentionally hide the CreateStore APIs that don't
// take an alignment.
llvm::StoreInst *CreateStore(llvm::Value *Val, Address Addr,
bool IsVolatile = false) {
return CreateAlignedStore(Val, Addr.getPointer(),
Addr.getAlignment().getQuantity(), IsVolatile);
}
using CGBuilderBaseTy::CreateAlignedStore;
llvm::StoreInst *CreateAlignedStore(llvm::Value *Val, llvm::Value *Addr,
CharUnits Align, bool IsVolatile = false) {
return CreateAlignedStore(Val, Addr, Align.getQuantity(), IsVolatile);
}
// FIXME: these "default-aligned" APIs should be removed,
// but I don't feel like fixing all the builtin code right now.
llvm::LoadInst *CreateDefaultAlignedLoad(llvm::Value *Addr,
const llvm::Twine &Name = "") {
return CGBuilderBaseTy::CreateLoad(Addr, false, Name);
}
llvm::LoadInst *CreateDefaultAlignedLoad(llvm::Value *Addr,
const char *Name) {
return CGBuilderBaseTy::CreateLoad(Addr, false, Name);
}
llvm::LoadInst *CreateDefaultAlignedLoad(llvm::Value *Addr, bool IsVolatile,
const llvm::Twine &Name = "") {
return CGBuilderBaseTy::CreateLoad(Addr, IsVolatile, Name);
}
llvm::StoreInst *CreateDefaultAlignedStore(llvm::Value *Val,
llvm::Value *Addr,
bool IsVolatile = false) {
return CGBuilderBaseTy::CreateStore(Val, Addr, IsVolatile);
}
/// Emit a load from an i1 flag variable.
llvm::LoadInst *CreateFlagLoad(llvm::Value *Addr,
const llvm::Twine &Name = "") {
assert(Addr->getType()->getPointerElementType() == getInt1Ty());
return CreateAlignedLoad(getInt1Ty(), Addr, CharUnits::One(), Name);
}
/// Emit a store to an i1 flag variable.
llvm::StoreInst *CreateFlagStore(bool Value, llvm::Value *Addr) {
assert(Addr->getType()->getPointerElementType() == getInt1Ty());
return CreateAlignedStore(getInt1(Value), Addr, CharUnits::One());
}
using CGBuilderBaseTy::CreateBitCast;
Address CreateBitCast(Address Addr, llvm::Type *Ty,
const llvm::Twine &Name = "") {
return Address(CreateBitCast(Addr.getPointer(), Ty, Name),
Addr.getAlignment());
}
/// Cast the element type of the given address to a different type,
/// preserving information like the alignment and address space.
Address CreateElementBitCast(Address Addr, llvm::Type *Ty,
const llvm::Twine &Name = "") {
auto PtrTy = Ty->getPointerTo(Addr.getAddressSpace());
return CreateBitCast(Addr, PtrTy, Name);
}
using CGBuilderBaseTy::CreatePointerBitCastOrAddrSpaceCast;
Address CreatePointerBitCastOrAddrSpaceCast(Address Addr, llvm::Type *Ty,
const llvm::Twine &Name = "") {
llvm::Value *Ptr =
CreatePointerBitCastOrAddrSpaceCast(Addr.getPointer(), Ty, Name);
return Address(Ptr, Addr.getAlignment());
}
using CGBuilderBaseTy::CreateStructGEP;
Address CreateStructGEP(Address Addr, unsigned Index, CharUnits Offset,
const llvm::Twine &Name = "") {
return Address(CreateStructGEP(Addr.getElementType(),
Addr.getPointer(), Index, Name),
Addr.getAlignment().alignmentAtOffset(Offset));
}
/// Given
/// %addr = [n x T]* ...
/// produce
/// %name = getelementptr inbounds %addr, i64 0, i64 index
/// where i64 is actually the target word size.
///
/// This API assumes that drilling into an array like this is always
/// an inbounds operation.
///
/// \param EltSize - the size of the type T in bytes
Address CreateConstArrayGEP(Address Addr, uint64_t Index, CharUnits EltSize,
const llvm::Twine &Name = "") {
return Address(CreateInBoundsGEP(Addr.getPointer(),
{getSize(CharUnits::Zero()),
getSize(Index)},
Name),
Addr.getAlignment().alignmentAtOffset(Index * EltSize));
}
/// Given
/// %addr = T* ...
/// produce
/// %name = getelementptr inbounds %addr, i64 index
/// where i64 is actually the target word size.
///
/// \param EltSize - the size of the type T in bytes
Address CreateConstInBoundsGEP(Address Addr, uint64_t Index,
CharUnits EltSize,
const llvm::Twine &Name = "") {
return Address(CreateInBoundsGEP(Addr.getElementType(), Addr.getPointer(),
getSize(Index), Name),
Addr.getAlignment().alignmentAtOffset(Index * EltSize));
}
/// Given
/// %addr = T* ...
/// produce
/// %name = getelementptr inbounds %addr, i64 index
/// where i64 is actually the target word size.
///
/// \param EltSize - the size of the type T in bytes
Address CreateConstGEP(Address Addr, uint64_t Index, CharUnits EltSize,
const llvm::Twine &Name = "") {
return Address(CreateGEP(Addr.getElementType(), Addr.getPointer(),
getSize(Index), Name),
Addr.getAlignment().alignmentAtOffset(Index * EltSize));
}
/// Given a pointer to i8, adjust it by a given constant offset.
Address CreateConstInBoundsByteGEP(Address Addr, CharUnits Offset,
const llvm::Twine &Name = "") {
assert(Addr.getElementType() == TypeCache.Int8Ty);
return Address(CreateInBoundsGEP(Addr.getPointer(), getSize(Offset), Name),
Addr.getAlignment().alignmentAtOffset(Offset));
}
Address CreateConstByteGEP(Address Addr, CharUnits Offset,
const llvm::Twine &Name = "") {
assert(Addr.getElementType() == TypeCache.Int8Ty);
return Address(CreateGEP(Addr.getPointer(), getSize(Offset), Name),
Addr.getAlignment().alignmentAtOffset(Offset));
}
llvm::Value *CreateConstInBoundsByteGEP(llvm::Value *Ptr, CharUnits Offset,
const llvm::Twine &Name = "") {
assert(Ptr->getType()->getPointerElementType() == TypeCache.Int8Ty);
return CreateInBoundsGEP(Ptr, getSize(Offset), Name);
}
llvm::Value *CreateConstByteGEP(llvm::Value *Ptr, CharUnits Offset,
const llvm::Twine &Name = "") {
assert(Ptr->getType()->getPointerElementType() == TypeCache.Int8Ty);
return CreateGEP(Ptr, getSize(Offset), Name);
}
using CGBuilderBaseTy::CreateMemCpy;
llvm::CallInst *CreateMemCpy(Address Dest, Address Src, llvm::Value *Size,
bool IsVolatile = false) {
return CreateMemCpy(Dest.getPointer(), Src.getPointer(), Size,
Dest.getAlignment().getQuantity(),
Src.getAlignment().getQuantity(), IsVolatile);
}
llvm::CallInst *CreateMemCpy(Address Dest, Address Src, uint64_t Size,
bool IsVolatile = false) {
return CreateMemCpy(Dest.getPointer(), Src.getPointer(), Size,
Dest.getAlignment().getQuantity(),
Src.getAlignment().getQuantity(), IsVolatile);
}
using CGBuilderBaseTy::CreateMemMove;
llvm::CallInst *CreateMemMove(Address Dest, Address Src, llvm::Value *Size,
bool IsVolatile = false) {
return CreateMemMove(Dest.getPointer(), Src.getPointer(), Size,
Dest.getAlignment().getQuantity(),
Src.getAlignment().getQuantity(), IsVolatile);
}
using CGBuilderBaseTy::CreateMemSet;
llvm::CallInst *CreateMemSet(Address Dest, llvm::Value *Value,
llvm::Value *Size, bool IsVolatile = false) {
return CreateMemSet(Dest.getPointer(), Value, Size,
Dest.getAlignment().getQuantity(), IsVolatile);
}
};
#undef PreserveNames
} // end namespace CodeGen
} // end namespace clang
#endif
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