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052f666a48
LBR contains (up to) 16 entries for last x branches and the X86LBRCounter (from D77422) should be able to return all those.
Currently, it just returns the latest entry, which could lead to mis-leading measurements.
This patch aslo changes the LatencyBenchmarkRunner to accommodate multi-value readings.
https://reviews.llvm.org/D81050
39 lines
1.2 KiB
C++
39 lines
1.2 KiB
C++
//===-- LatencyBenchmarkRunner.h --------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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 instruction latencies.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TOOLS_LLVM_EXEGESIS_LATENCY_H
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#define LLVM_TOOLS_LLVM_EXEGESIS_LATENCY_H
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#include "BenchmarkRunner.h"
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namespace llvm {
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namespace exegesis {
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class LatencyBenchmarkRunner : public BenchmarkRunner {
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public:
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LatencyBenchmarkRunner(
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const LLVMState &State, InstructionBenchmark::ModeE Mode,
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InstructionBenchmark::ResultAggregationModeE ResultAggMode);
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~LatencyBenchmarkRunner() override;
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private:
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Expected<std::vector<BenchmarkMeasure>>
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runMeasurements(const FunctionExecutor &Executor) const override;
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InstructionBenchmark::ResultAggregationModeE ResultAggMode;
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};
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} // namespace exegesis
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} // namespace llvm
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#endif // LLVM_TOOLS_LLVM_EXEGESIS_LATENCY_H
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