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/*========================== begin_copyright_notice ============================
Copyright (C) 2017-2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#pragma once
#include "Compiler/IGCPassSupport.h"
#include "Compiler/CodeGenPublic.h"
#include "common/LLVMWarningsPush.hpp"
#include "llvm/Pass.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/Support/raw_ostream.h"
#include "common/LLVMWarningsPop.hpp"
namespace IGC
{
//===----------------------------------------------------------------------===//
//
// Optimization pass.
//
// It detects sample instructions in a BB, that differ only by coordinates
// argument from a sample instruction used at the beginning of the BB.
// In that case those similar sample instructions can be "gated": surrounded by if-then, where they
// are placed in the "if-then" block, and skipped otherwise.
//
//===----------------------------------------------------------------------===//
class GatingSimilarSamples : public llvm::FunctionPass
{
public:
static char ID;
GatingSimilarSamples() : llvm::FunctionPass(ID)
{
initializeGatingSimilarSamplesPass(*llvm::PassRegistry::getPassRegistry());
}
virtual bool runOnFunction(llvm::Function& F) override;
void getAnalysisUsage(llvm::AnalysisUsage& AU) const override
{
AU.addRequired<IGC::CodeGenContextWrapper>();
}
/// @brief Provides name of pass
virtual llvm::StringRef getPassName() const override
{
return "GatingSimilarSamples";
}
private:
llvm::BasicBlock* BB = nullptr;
llvm::Instruction* motionSample = nullptr;
llvm::Instruction* texelSample = nullptr;
llvm::Instruction* resultInst = nullptr;
//motion.xy will be the gating value
llvm::Value* gatingValue_mul1 = nullptr; //motion.x
llvm::Value* gatingValue_mul2 = nullptr; //motion.y
std::vector<llvm::Instruction*> similarSampleInsts{};
bool areSampleInstructionsSimilar(llvm::Instruction*, llvm::Instruction*);
bool checkAndSaveSimilarSampleInsts();
bool setOrCmpGatingValue(llvm::Value*& gatingValueToCmp1, llvm::Instruction* mulInst, const llvm::Instruction* texelSampleInst);
bool findAndSetCommonGatingValue();
};
llvm::FunctionPass* CreateGatingSimilarSamples();
}
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