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c29c4efaa7
This is adoption of HSAIL perfhint pass. Two types of hints are produced: 1. Function is memory bound. 2. Kernel can use wave limiter. Currently these hints are used in the scheduler. If a function is suspected to be memory bound we allow occupancy to decrease to 4 waves in the course of scheduling. Differential Revision: https://reviews.llvm.org/D46992 llvm-svn: 333289
56 lines
1.6 KiB
C++
56 lines
1.6 KiB
C++
//===- AMDGPUPerfHintAnalysis.h - analysis of functions memory traffic ----===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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/// \file
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/// \brief Analyzes if a function potentially memory bound and if a kernel
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/// kernel may benefit from limiting number of waves to reduce cache thrashing.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_AMDGPU_MDGPUPERFHINTANALYSIS_H
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#define LLVM_LIB_TARGET_AMDGPU_MDGPUPERFHINTANALYSIS_H
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#include "llvm/IR/ValueMap.h"
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#include "llvm/Pass.h"
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namespace llvm {
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struct AMDGPUPerfHintAnalysis : public FunctionPass {
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static char ID;
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public:
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AMDGPUPerfHintAnalysis() : FunctionPass(ID) {}
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bool runOnFunction(Function &F) override;
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void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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}
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bool isMemoryBound(const Function *F) const;
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bool needsWaveLimiter(const Function *F) const;
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struct FuncInfo {
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unsigned MemInstCount;
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unsigned InstCount;
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unsigned IAMInstCount; // Indirect access memory instruction count
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unsigned LSMInstCount; // Large stride memory instruction count
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FuncInfo() : MemInstCount(0), InstCount(0), IAMInstCount(0),
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LSMInstCount(0) {}
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};
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typedef ValueMap<const Function*, FuncInfo> FuncInfoMap;
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private:
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FuncInfoMap FIM;
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};
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} // namespace llvm
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#endif // LLVM_LIB_TARGET_AMDGPU_MDGPUPERFHINTANALYSIS_H
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