1//===- AMDGPUPerfHintAnalysis.h ---- analysis of memory traffic -*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9/// \file
10/// \brief Analyzes if a function potentially memory bound and if a kernel
11/// kernel may benefit from limiting number of waves to reduce cache thrashing.
12///
13//===----------------------------------------------------------------------===//
14
15#ifndef LLVM_LIB_TARGET_AMDGPU_MDGPUPERFHINTANALYSIS_H
16#define LLVM_LIB_TARGET_AMDGPU_MDGPUPERFHINTANALYSIS_H
17
18#include "llvm/Analysis/CallGraphSCCPass.h"
19#include "llvm/IR/ValueMap.h"
20
21namespace llvm {
22
23struct AMDGPUPerfHintAnalysis : public CallGraphSCCPass {
24  static char ID;
25
26public:
27  AMDGPUPerfHintAnalysis() : CallGraphSCCPass(ID) {}
28
29  bool runOnSCC(CallGraphSCC &SCC) override;
30
31  void getAnalysisUsage(AnalysisUsage &AU) const override {
32    AU.setPreservesAll();
33  }
34
35  bool isMemoryBound(const Function *F) const;
36
37  bool needsWaveLimiter(const Function *F) const;
38
39  struct FuncInfo {
40    unsigned MemInstCost;
41    unsigned InstCost;
42    unsigned IAMInstCost; // Indirect access memory instruction count
43    unsigned LSMInstCost; // Large stride memory instruction count
44    bool HasDenseGlobalMemAcc; // Set if at least 1 basic block has relatively
45                               // high global memory access
46    FuncInfo()
47        : MemInstCost(0), InstCost(0), IAMInstCost(0), LSMInstCost(0),
48          HasDenseGlobalMemAcc(false) {}
49  };
50
51  typedef ValueMap<const Function*, FuncInfo> FuncInfoMap;
52
53private:
54
55  FuncInfoMap FIM;
56};
57} // namespace llvm
58#endif // LLVM_LIB_TARGET_AMDGPU_MDGPUPERFHINTANALYSIS_H
59