59 lines
1.5 KiB
C++
59 lines
1.5 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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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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#ifndef BENCHMARK_VARIANT_BENCHMARKS_H
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#define BENCHMARK_VARIANT_BENCHMARKS_H
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#include <array>
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#include <cstddef>
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#include <tuple>
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#include <type_traits>
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#include <variant>
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#include "benchmark/benchmark.h"
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#include "GenerateInput.h"
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namespace VariantBenchmarks {
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template <std::size_t I>
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struct S {
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static constexpr size_t v = I;
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};
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template <std::size_t N, std::size_t... Is>
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static auto genVariants(std::index_sequence<Is...>) {
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using V = std::variant<S<Is>...>;
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using F = V (*)();
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static constexpr F fs[] = {[] { return V(std::in_place_index<Is>); }...};
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std::array<V, N> result = {};
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for (auto& v : result) {
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v = fs[getRandomInteger(0ul, sizeof...(Is) - 1)]();
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}
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return result;
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}
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template <std::size_t N, std::size_t Alts>
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static void BM_Visit(benchmark::State& state) {
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auto args = genVariants<N>(std::make_index_sequence<Alts>{});
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for (auto _ : state) {
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benchmark::DoNotOptimize(std::apply(
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[](auto... vs) {
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return std::visit([](auto... is) { return (is.v + ... + 0); }, vs...);
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},
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args));
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}
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}
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} // end namespace VariantBenchmarks
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#endif // BENCHMARK_VARIANT_BENCHMARKS_H
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