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/*========================== begin_copyright_notice ============================
Copyright (C) 2020-2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#include "Compiler/CISACodeGen/CrossPhaseConstProp.hpp"
#include "LLVMWarningsPush.hpp"
#include "llvm/Pass.h"
#include "LLVMWarningsPop.hpp"
#include "Compiler/CISACodeGen/PixelShaderCodeGen.hpp"
#include "Compiler/CISACodeGen/helper.h"
#include "Compiler/MetaDataUtilsWrapper.h"
using namespace llvm;
namespace {
class CrossPhaseConstProp : public FunctionPass {
public:
static char ID; // Pass identification, replacement for typeid
CrossPhaseConstProp(IGC::PSSignature *signature = nullptr);
bool runOnFunction(Function &F) override;
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.addRequired<IGC::MetaDataUtilsWrapper>();
AU.setPreservesCFG();
}
private:
IGC::PSSignature *m_signature;
};
} // namespace
#define PASS_FLAG "igc-crossphaseconstprop"
#define PASS_DESCRIPTION "Special const prop for multirate shading"
#define PASS_CFG_ONLY false
#define PASS_ANALYSIS false
IGC_INITIALIZE_PASS_BEGIN(CrossPhaseConstProp, PASS_FLAG, PASS_DESCRIPTION, PASS_CFG_ONLY, PASS_ANALYSIS)
IGC_INITIALIZE_PASS_DEPENDENCY(MetaDataUtilsWrapper)
IGC_INITIALIZE_PASS_END(CrossPhaseConstProp, PASS_FLAG, PASS_DESCRIPTION, PASS_CFG_ONLY, PASS_ANALYSIS)
CrossPhaseConstProp::CrossPhaseConstProp(IGC::PSSignature *signature) : FunctionPass(ID), m_signature(signature) {
initializeCrossPhaseConstPropPass(*PassRegistry::getPassRegistry());
}
char CrossPhaseConstProp::ID = 0;
FunctionPass *IGC::createCrossPhaseConstPropPass(IGC::PSSignature *signature) {
return new CrossPhaseConstProp(signature);
}
bool CrossPhaseConstProp::runOnFunction(Function &F) {
IGC::IGCMD::MetaDataUtils *pMdUtils = getAnalysis<IGC::MetaDataUtilsWrapper>().getMetaDataUtils();
if (!IGC::isEntryFunc(pMdUtils, &F) || m_signature == nullptr) {
return false;
}
std::vector<Instruction *> instructionsToRemove;
bool isCoarse = IGC::isCoarsePhaseFunction(&F);
bool isPerPixel = IGC::isPixelPhaseFunction(&F);
if (isCoarse || isPerPixel) {
for (auto &BB : F) {
for (auto &I : BB) {
if (GenIntrinsicInst *inst = dyn_cast<GenIntrinsicInst>(&I)) {
GenISAIntrinsic::ID IID = inst->getIntrinsicID();
if (isPerPixel && IID == GenISAIntrinsic::GenISA_PHASE_INPUT) {
unsigned int index = (unsigned int)cast<llvm::ConstantInt>(inst->getOperand(0))->getZExtValue();
auto constantOutput = m_signature->PSConstantOutput.find(index);
if (constantOutput != m_signature->PSConstantOutput.end()) {
inst->replaceAllUsesWith(ConstantFP::get(
inst->getType(), APFloat(inst->getType()->getFltSemantics(),
APInt(inst->getType()->getScalarSizeInBits(), constantOutput->second))));
instructionsToRemove.push_back(inst);
}
} else if (isCoarse && IID == GenISAIntrinsic::GenISA_PHASE_OUTPUT) {
if (auto fpValue = dyn_cast<ConstantFP>(inst->getArgOperand(0))) {
unsigned int index = (unsigned int)cast<llvm::ConstantInt>(inst->getArgOperand(1))->getZExtValue();
m_signature->PSConstantOutput[index] = fpValue->getValueAPF().bitcastToAPInt().getLimitedValue();
instructionsToRemove.push_back(inst);
}
}
}
}
}
for (auto inst : instructionsToRemove) {
inst->eraseFromParent();
}
}
return instructionsToRemove.size() > 0;
}
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