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/*========================== begin_copyright_notice ============================
Copyright (C) 2017-2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#include "Compiler/IGCPassSupport.h"
#include "Compiler/InitializePasses.h"
#include "common/Types.hpp"
#include "ScalarizerCodeGen.hpp"
#include "llvmWrapper/IR/DerivedTypes.h"
using namespace llvm;
using namespace IGC;
#define PASS_FLAG "igc-scalarizer-in-codegen"
#define PASS_DESCRIPTION "Scalarizer in codegen"
#define PASS_CFG_ONLY false
#define PASS_ANALYSIS false
IGC_INITIALIZE_PASS_BEGIN(ScalarizerCodeGen, PASS_FLAG, PASS_DESCRIPTION, PASS_CFG_ONLY, PASS_ANALYSIS)
IGC_INITIALIZE_PASS_END(ScalarizerCodeGen, PASS_FLAG, PASS_DESCRIPTION, PASS_CFG_ONLY, PASS_ANALYSIS)
char ScalarizerCodeGen::ID = 0;
#define DEBUG_TYPE "ScalarizerCodeGen"
ScalarizerCodeGen::ScalarizerCodeGen() : FunctionPass(ID) {
initializeScalarizerCodeGenPass(*PassRegistry::getPassRegistry());
}
bool ScalarizerCodeGen::runOnFunction(Function &F) {
llvm::IRBuilder<> builder(F.getContext());
m_builder = &builder;
visit(F);
return false;
}
void ScalarizerCodeGen::visitBinaryOperator(llvm::BinaryOperator &I) {
// Scalarizing vector type And/Or instructions
if (I.getOpcode() == Instruction::And || I.getOpcode() == Instruction::Or || I.getOpcode() == Instruction::Xor) {
if (I.getType()->isVectorTy()) {
bool isNewTypeVector = false;
IGCLLVM::FixedVectorType *instType = cast<IGCLLVM::FixedVectorType>(I.getType());
unsigned numElements = int_cast<unsigned>(instType->getNumElements());
unsigned scalarSize = instType->getScalarSizeInBits();
unsigned newScalarBits = numElements * scalarSize;
Type *newType = nullptr;
// Check if the operands can be bitcasted to types int8/16/32
if (newScalarBits == 8)
newType = m_builder->getInt8Ty();
else if (newScalarBits == 16)
newType = m_builder->getInt16Ty();
else if (newScalarBits == 32)
newType = m_builder->getInt32Ty();
else {
// Check the suitable vector type to cast to, inorder to minimize the number of instructions
isNewTypeVector = true;
if (newScalarBits % 32 == 0)
newType = IGCLLVM::FixedVectorType::get(m_builder->getInt32Ty(), newScalarBits / 32);
else if (newScalarBits % 16 == 0)
newType = IGCLLVM::FixedVectorType::get(m_builder->getInt16Ty(), newScalarBits / 16);
else if (newScalarBits % 8 == 0)
newType = IGCLLVM::FixedVectorType::get(m_builder->getInt8Ty(), newScalarBits / 8);
else
isNewTypeVector = false;
}
if (newType) {
Value *src0 = I.getOperand(0);
Value *src1 = I.getOperand(1);
auto logicOp = I.getOpcode();
m_builder->SetInsertPoint(&I);
// bitcast the operands to new type
Value *castedSrc0 = m_builder->CreateBitCast(src0, newType);
Value *castedSrc1 = m_builder->CreateBitCast(src1, newType);
Value *newBitCastInst;
// Generate scalar logic operations, and then bitcast the result to a vector type
if (!isNewTypeVector) {
Value *newLogicInst = m_builder->CreateBinOp(logicOp, castedSrc0, castedSrc1);
newBitCastInst = m_builder->CreateBitCast(newLogicInst, instType);
} else {
IGCLLVM::FixedVectorType *newVecType = cast<IGCLLVM::FixedVectorType>(newType);
unsigned newVecTypeNumEle = int_cast<unsigned>(newVecType->getNumElements());
Value *ieLogicOp = UndefValue::get(newType);
for (unsigned i = 0; i < newVecTypeNumEle; i++) {
Value *constIndex = ConstantInt::get(m_builder->getInt32Ty(), i);
Value *eeSrc0 = m_builder->CreateExtractElement(castedSrc0, constIndex);
Value *eeSrc1 = m_builder->CreateExtractElement(castedSrc1, constIndex);
Value *newLogicInst = m_builder->CreateBinOp(logicOp, eeSrc0, eeSrc1);
ieLogicOp = m_builder->CreateInsertElement(ieLogicOp, newLogicInst, constIndex);
}
newBitCastInst = m_builder->CreateBitCast(ieLogicOp, instType);
}
// Now replace all the instruction users with the newly bitcasted Logic Instruction
I.replaceAllUsesWith(newBitCastInst);
I.eraseFromParent();
}
}
}
}
void ScalarizerCodeGen::visitCastInst(llvm::CastInst &I) {
// Scalarizing vector type Trunc/Ext instructions
if (I.getOpcode() == Instruction::Trunc || I.getOpcode() == Instruction::ZExt || I.getOpcode() == Instruction::SExt) {
if (I.getType()->isVectorTy()) {
IGCLLVM::FixedVectorType *instType = cast<IGCLLVM::FixedVectorType>(I.getType());
unsigned numElements = int_cast<unsigned>(instType->getNumElements());
Type *dstType = instType->getScalarType();
Value *src0 = I.getOperand(0);
auto castOp = I.getOpcode();
m_builder->SetInsertPoint(&I);
Value *lastOp = UndefValue::get(instType);
for (unsigned i = 0; i < numElements; i++) {
Value *constIndex = ConstantInt::get(m_builder->getInt32Ty(), i);
Value *eeSrc0 = m_builder->CreateExtractElement(src0, constIndex);
Value *newCastInst = nullptr;
switch (castOp) {
case Instruction::Trunc:
newCastInst = m_builder->CreateTrunc(eeSrc0, dstType);
break;
case Instruction::ZExt:
newCastInst = m_builder->CreateZExt(eeSrc0, dstType);
break;
case Instruction::SExt:
newCastInst = m_builder->CreateSExt(eeSrc0, dstType);
break;
default:
IGC_ASSERT(0);
}
lastOp = m_builder->CreateInsertElement(lastOp, newCastInst, constIndex);
}
// Now replace all the instruction users with the newly created instruction
I.replaceAllUsesWith(lastOp);
I.eraseFromParent();
}
}
}
void ScalarizerCodeGen::visitFNeg(llvm::UnaryOperator &I) {
if (I.getType()->isVectorTy()) {
IGCLLVM::FixedVectorType *InstType = cast<IGCLLVM::FixedVectorType>(I.getType());
unsigned NumElements = int_cast<unsigned>(InstType->getNumElements());
Value *Src = I.getOperand(0);
m_builder->SetInsertPoint(&I);
Value *LastOp = UndefValue::get(InstType);
for (unsigned Idx = 0; Idx < NumElements; Idx++) {
Value *ConstIndex = ConstantInt::get(m_builder->getInt32Ty(), Idx);
Value *EESrc0 = m_builder->CreateExtractElement(Src, ConstIndex);
Value *NewFNegInst = m_builder->CreateFNeg(EESrc0);
LastOp = m_builder->CreateInsertElement(LastOp, NewFNegInst, ConstIndex);
}
// Now replace all the instruction users with the newly created instruction
I.replaceAllUsesWith(LastOp);
I.eraseFromParent();
}
}
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