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1931b181a5
Summary: The snippet-generation part goes to the SnippetGenerator class. This will allow benchmarking arbitrary code (see PR38437). Reviewers: gchatelet Subscribers: mgorny, tschuett, llvm-commits Differential Revision: https://reviews.llvm.org/D51979 llvm-svn: 342117
81 lines
2.6 KiB
C++
81 lines
2.6 KiB
C++
//===-- Uops.h --------------------------------------------------*- C++ -*-===//
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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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/// A BenchmarkRunner implementation to measure uop decomposition.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TOOLS_LLVM_EXEGESIS_UOPS_H
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#define LLVM_TOOLS_LLVM_EXEGESIS_UOPS_H
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#include "BenchmarkRunner.h"
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#include "SnippetGenerator.h"
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namespace exegesis {
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class UopsSnippetGenerator : public SnippetGenerator {
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public:
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UopsSnippetGenerator(const LLVMState &State) : SnippetGenerator(State) {}
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~UopsSnippetGenerator() override;
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llvm::Expected<CodeTemplate>
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generateCodeTemplate(unsigned Opcode) const override;
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static constexpr const size_t kMinNumDifferentAddresses = 6;
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private:
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llvm::Error isInfeasible(const llvm::MCInstrDesc &MCInstrDesc) const;
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// Instantiates memory operands within a snippet.
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// To make computations as parallel as possible, we generate independant
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// memory locations for instructions that load and store. If there are less
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// than kMinNumDifferentAddresses in the original snippet, we duplicate
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// instructions until there are this number of instructions.
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// For example, assuming kMinNumDifferentAddresses=5 and
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// getMaxMemoryAccessSize()=64, if the original snippet is:
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// mov eax, [memory]
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// we might generate:
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// mov eax, [rdi]
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// mov eax, [rdi + 64]
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// mov eax, [rdi + 128]
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// mov eax, [rdi + 192]
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// mov eax, [rdi + 256]
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// If the original snippet is:
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// mov eax, [memory]
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// add eax, [memory]
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// we might generate:
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// mov eax, [rdi]
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// add eax, [rdi + 64]
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// mov eax, [rdi + 128]
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// add eax, [rdi + 192]
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// mov eax, [rdi + 256]
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void
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instantiateMemoryOperands(unsigned ScratchSpaceReg,
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std::vector<InstructionBuilder> &Snippet) const;
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};
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class UopsBenchmarkRunner : public BenchmarkRunner {
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public:
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UopsBenchmarkRunner(const LLVMState &State)
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: BenchmarkRunner(State, InstructionBenchmark::Uops) {}
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~UopsBenchmarkRunner() override;
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static constexpr const size_t kMinNumDifferentAddresses = 6;
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private:
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std::vector<BenchmarkMeasure>
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runMeasurements(const ExecutableFunction &EF, ScratchSpace &Scratch,
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const unsigned NumRepetitions) const override;
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};
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} // namespace exegesis
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#endif // LLVM_TOOLS_LLVM_EXEGESIS_UOPS_H
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