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//===- AMDGPUPerfHintAnalysis.h ---- analysis of memory traffic -*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
/// \file
/// \brief Analyzes if a function potentially memory bound and if a kernel
/// kernel may benefit from limiting number of waves to reduce cache thrashing.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_AMDGPU_AMDGPUPERFHINTANALYSIS_H
#define LLVM_LIB_TARGET_AMDGPU_AMDGPUPERFHINTANALYSIS_H
#include "llvm/IR/PassManager.h"
#include "llvm/IR/ValueMap.h"
#include "llvm/Analysis/CGSCCPassManager.h"
#include "llvm/Analysis/LazyCallGraph.h"
namespace llvm {
class AMDGPUPerfHintAnalysis;
class CallGraphSCC;
class GCNTargetMachine;
class LazyCallGraph;
class AMDGPUPerfHintAnalysis {
public:
struct FuncInfo {
unsigned MemInstCost;
unsigned InstCost;
unsigned IAMInstCost; // Indirect access memory instruction count
unsigned LSMInstCost; // Large stride memory instruction count
bool HasDenseGlobalMemAcc; // Set if at least 1 basic block has relatively
// high global memory access
FuncInfo()
: MemInstCost(0), InstCost(0), IAMInstCost(0), LSMInstCost(0),
HasDenseGlobalMemAcc(false) {}
};
typedef ValueMap<const Function *, FuncInfo> FuncInfoMap;
private:
FuncInfoMap FIM;
public:
AMDGPUPerfHintAnalysis() {}
// OldPM
bool runOnSCC(const GCNTargetMachine &TM, CallGraphSCC &SCC);
// NewPM
bool run(const GCNTargetMachine &TM, LazyCallGraph &CG);
bool isMemoryBound(const Function *F) const;
bool needsWaveLimiter(const Function *F) const;
};
struct AMDGPUPerfHintAnalysisPass
: public PassInfoMixin<AMDGPUPerfHintAnalysisPass> {
const GCNTargetMachine &TM;
std::unique_ptr<AMDGPUPerfHintAnalysis> Impl;
AMDGPUPerfHintAnalysisPass(const GCNTargetMachine &TM)
: TM(TM), Impl(std::make_unique<AMDGPUPerfHintAnalysis>()) {}
PreservedAnalyses run(Module &M, ModuleAnalysisManager &AM);
};
} // namespace llvm
#endif // LLVM_LIB_TARGET_AMDGPU_AMDGPUPERFHINTANALYSIS_H
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