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/*========================== begin_copyright_notice ============================
Copyright (C) 2022 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#pragma once
#include "Compiler/CISACodeGen/WIAnalysis.hpp"
#include "Compiler/CISACodeGen/CVariable.hpp"
#include "Compiler/CodeGenContextWrapper.hpp"
#include "common/LLVMWarningsPush.hpp"
#include "llvm/ADT/DenseMap.h"
#include <llvm/IR/Function.h>
#include <llvm/IR/Instructions.h>
#include "llvm/Pass.h"
#include "llvm/Support/raw_ostream.h"
#include "common/LLVMWarningsPop.hpp"
namespace IGC {
// figure out when to start a loop for lane-varying resource access,
// and when to end such loop. So we can wrap around multiple lane-varying
// resource access with single loop to hide latency and save instructions
class ResourceLoopAnalysis : public llvm::FunctionPass {
public:
enum {
MarkResourceLoopOutside = 0,
MarkResourceLoopStart = 1,
MarkResourceLoopInside = 2,
MarkResourceLoopEnd = 4,
};
static char ID;
ResourceLoopAnalysis();
~ResourceLoopAnalysis() {}
virtual llvm::StringRef getPassName() const override { return "Resource Loop Analysis"; }
virtual bool runOnFunction(llvm::Function &F) override;
virtual void getAnalysisUsage(llvm::AnalysisUsage &AU) const override {
AU.setPreservesAll();
AU.addRequired<WIAnalysis>();
AU.addRequired<CodeGenContextWrapper>();
}
void SaveStateLoopStart(ResourceDescriptor res, SamplerDescriptor samp, CVariable *f, unsigned l) {
resource = res;
sampler = samp;
flag = f;
label = l;
}
void ClearStateLoopEnd() {
resource.m_resource = nullptr;
sampler.m_sampler = nullptr;
flag = nullptr;
label = 0;
}
ResourceDescriptor &GetResourceLoopResource() { return resource; }
SamplerDescriptor &GetResourceLoopSampler() { return sampler; }
unsigned GetResourceLoopLabel() { return label; }
CVariable *GetResourceLoopFlag() { return flag; }
unsigned GetResourceLoopMarker(llvm::Instruction *inst) {
if (LoopMap.find(inst) == LoopMap.end())
return MarkResourceLoopOutside;
return LoopMap[inst];
}
///
void printResourceLoops(llvm::raw_ostream &OS, llvm::Function *F = nullptr) const;
private:
CodeGenContext *CTX = nullptr;
// analysis result
llvm::DenseMap<llvm::Instruction *, unsigned> LoopMap;
// recording state for loop emission
ResourceDescriptor resource;
SamplerDescriptor sampler;
CVariable *flag = nullptr;
uint32_t label = 0;
};
llvm::FunctionPass *createResourceLoopAnalysisPass();
} // namespace IGC
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