LLVM 17.0.0git
AMDGPUPerfHintAnalysis.h
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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
19#include "llvm/IR/ValueMap.h"
20
21namespace llvm {
22
24 static char ID;
25
26public:
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
49 };
50
52
53private:
54
55 FuncInfoMap FIM;
56};
57} // namespace llvm
58#endif // LLVM_LIB_TARGET_AMDGPU_MDGPUPERFHINTANALYSIS_H
#define F(x, y, z)
Definition: MD5.cpp:55
Represent the analysis usage information of a pass.
void setPreservesAll()
Set by analyses that do not transform their input at all.
CallGraphSCC - This is a single SCC that a CallGraphSCCPass is run on.
See the file comment.
Definition: ValueMap.h:84
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18
void getAnalysisUsage(AnalysisUsage &AU) const override
getAnalysisUsage - For this class, we declare that we require and preserve the call graph.
bool runOnSCC(CallGraphSCC &SCC) override
runOnSCC - This method should be implemented by the subclass to perform whatever action is necessary ...
bool isMemoryBound(const Function *F) const
ValueMap< const Function *, FuncInfo > FuncInfoMap
bool needsWaveLimiter(const Function *F) const