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/*========================== begin_copyright_notice ============================
Copyright (C) 2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
//===----------------------------------------------------------------------===//
///
/// These functions convert load and store instructions that have 64-bit
/// elements (whether scalar or vector) to vectors of dwords.
///
/// This is used by PrepareLoadsStoresPass to run prior to MemOpt to aid
/// vectorization of values with different types.
///
/// For example:
///
/// %x = load i64, i64 addrspace(1)* %"&x"
/// ===>
/// %7 = bitcast i64 addrspace(1)* %"&x" to <2 x i32> addrspace(1)*
/// 8 = load <2 x i32>, <2 x i32> addrspace(1)* %7
/// %9 = bitcast <2 x i32> %8 to i64
///
//===----------------------------------------------------------------------===//
#include "Compiler/IGCPassSupport.h"
#include "Compiler/CodeGenPublicEnums.h"
#include "Compiler/CodeGenPublic.h"
#include "AdaptorCommon/RayTracing/RTBuilder.h"
#include "PrepareLoadsStoresUtils.h"
#include "common/LLVMWarningsPush.hpp"
#include "llvmWrapper/Support/Alignment.h"
#include "llvmWrapper/IR/DerivedTypes.h"
#include <llvm/IR/IRBuilder.h>
#include <llvm/IR/InstIterator.h>
#include <llvm/IR/NoFolder.h>
#include "common/LLVMWarningsPop.hpp"
using namespace llvm;
using namespace IGC;
using IGCLLVM::getAlign;
template <typename T>
static Value* getIntToPtr(IRBuilder<T> &IRB, Value* NewVal, Type* Ty)
{
// We must emit scalar inttoptr this late in compilation otherwise it won't
// be handled correctly (by e.g., Emu64Ops).
if (NewVal->getType()->isIntegerTy())
return IRB.CreateIntToPtr(NewVal, Ty);
// otherwise, 'NewVal' and 'Ty' are both vectors and will have the same
// length.
IGCLLVM::FixedVectorType* newVecType = dyn_cast<IGCLLVM::FixedVectorType>(NewVal->getType());
IGCLLVM::FixedVectorType* vecType = dyn_cast<IGCLLVM::FixedVectorType>(Ty);
uint64_t NumElts = newVecType->getNumElements();
IGC_ASSERT(NumElts == vecType->getNumElements());
Value* ResultVec = UndefValue::get(vecType);
auto* ResEltTy = vecType->getElementType();
for (uint32_t i = 0; i < NumElts; i++)
{
auto* Elt = IRB.CreateExtractElement(NewVal, i);
auto* Cast = IRB.CreateIntToPtr(Elt, ResEltTy);
ResultVec = IRB.CreateInsertElement(ResultVec, Cast, i);
}
return ResultVec;
}
template <typename T>
static Value* getPtrToInt(IRBuilder<T> &IRB, Value* NewVal, Type* Ty)
{
// We must emit scalar ptrtoint this late in compilation otherwise it won't
// be handled correctly (by e.g., Emu64Ops).
if (NewVal->getType()->isPointerTy())
return IRB.CreatePtrToInt(NewVal, Ty);
// otherwise, 'NewVal' and 'Ty' are both vectors and will have the same
// length.
IGCLLVM::FixedVectorType* newVecType = dyn_cast<IGCLLVM::FixedVectorType>(NewVal->getType());
IGCLLVM::FixedVectorType* vecType = dyn_cast<IGCLLVM::FixedVectorType>(Ty);
uint64_t NumElts = newVecType->getNumElements();
IGC_ASSERT(NumElts == vecType->getNumElements());
Value* ResultVec = UndefValue::get(Ty);
auto* ResEltTy = vecType->getElementType();
for (uint32_t i = 0; i < NumElts; i++)
{
auto* Elt = IRB.CreateExtractElement(NewVal, i);
auto* Cast = IRB.CreatePtrToInt(Elt, ResEltTy);
ResultVec = IRB.CreateInsertElement(ResultVec, Cast, i);
}
return ResultVec;
}
namespace IGC {
template <typename T>
std::pair<Value*, LoadInst*>
expand64BitLoad(IRBuilder<T>& IRB, const DataLayout &DL, LoadInst* LI)
{
auto* Ty = LI->getType();
if (Ty->isAggregateType())
return {};
auto* EltTy = Ty->getScalarType();
auto* OldPtrTy = LI->getPointerOperandType();
uint64_t NumEltBytes = DL.getTypeStoreSize(EltTy);
if (NumEltBytes != 8)
return {};
uint32_t NumElts = isa<IGCLLVM::FixedVectorType>(Ty) ?
(uint32_t)cast<IGCLLVM::FixedVectorType>(Ty)->getNumElements() : 1;
uint32_t NewNumElts = NumElts * 2;
auto* NewTy = IGCLLVM::FixedVectorType::get(IRB.getInt32Ty(), NewNumElts);
auto* PtrTy = PointerType::get(
NewTy, OldPtrTy->getPointerAddressSpace());
auto* NewPtr = IRB.CreateBitCast(LI->getPointerOperand(), PtrTy);
LoadInst* NewLI =
IRB.CreateAlignedLoad(NewTy, NewPtr, IGCLLVM::getCorrectAlign(LI->getAlignment()));
NewLI->copyMetadata(*LI);
Value* NewVal = NewLI;
if (Ty->isPtrOrPtrVectorTy())
{
Type* NewTy = (NumElts == 1) ?
(Type*)IRB.getInt64Ty() :
(Type*)IGCLLVM::FixedVectorType::get(IRB.getInt64Ty(), NumElts);
NewVal = IRB.CreateBitCast(NewVal, NewTy);
NewVal = getIntToPtr(IRB, NewVal, Ty);
}
else
{
NewVal = IRB.CreateBitCast(NewVal, Ty);
}
return { NewVal, NewLI };
}
template <typename T>
StoreInst* expand64BitStore(IRBuilder<T>& IRB, const DataLayout &DL, StoreInst* SI)
{
auto* Ty = SI->getValueOperand()->getType();
if (Ty->isAggregateType())
return nullptr;
auto* EltTy = Ty->getScalarType();
auto* OldPtrTy = SI->getPointerOperandType();
uint64_t NumEltBytes = DL.getTypeStoreSize(EltTy);
if (NumEltBytes != 8)
return nullptr;
uint32_t NumElts = isa<IGCLLVM::FixedVectorType>(Ty) ?
(uint32_t)cast<IGCLLVM::FixedVectorType>(Ty)->getNumElements() : 1;
uint32_t NewNumElts = NumElts * 2;
auto* NewTy = IGCLLVM::FixedVectorType::get(IRB.getInt32Ty(), NewNumElts);
Value* NewVal = SI->getValueOperand();
if (Ty->isPtrOrPtrVectorTy())
{
Type* NewTy = (NumElts == 1) ?
(Type*)IRB.getInt64Ty() :
(Type*)IGCLLVM::FixedVectorType::get(IRB.getInt64Ty(), NumElts);
NewVal = getPtrToInt(IRB, NewVal, NewTy);
}
NewVal = IRB.CreateBitCast(NewVal, NewTy);
auto* NewPtr = IRB.CreateBitCast(
SI->getPointerOperand(),
NewVal->getType()->getPointerTo(
OldPtrTy->getPointerAddressSpace()));
auto* NewST =
IRB.CreateAlignedStore(NewVal, NewPtr, IGCLLVM::getCorrectAlign(SI->getAlignment()));
NewST->copyMetadata(*SI);
return NewST;
}
template std::pair<Value*, LoadInst*>
expand64BitLoad(IRBuilder<>& IRB, const DataLayout& DL, LoadInst* LI);
template StoreInst* expand64BitStore(
IRBuilder<>& IRB, const DataLayout& DL, StoreInst* SI);
template std::pair<Value*, LoadInst*>
expand64BitLoad(IRBuilder<NoFolder>& IRB, const DataLayout& DL, LoadInst* LI);
template StoreInst* expand64BitStore(
IRBuilder<NoFolder>& IRB, const DataLayout& DL, StoreInst* SI);
}
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