forked from OSchip/llvm-project
134 lines
4.5 KiB
C++
134 lines
4.5 KiB
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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#include <string>
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#include <tuple>
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#include <type_traits>
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#include <vector>
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#include "benchmark/benchmark.h"
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#include "test_macros.h"
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namespace internal {
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template <class D, class E, size_t I>
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struct EnumValue : std::integral_constant<E, static_cast<E>(I)> {
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static std::string name() { return std::string("_") + D::Names[I]; }
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};
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template <class D, class E, size_t ...Idxs>
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constexpr auto makeEnumValueTuple(std::index_sequence<Idxs...>) {
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return std::make_tuple(EnumValue<D, E, Idxs>{}...);
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}
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template <class B>
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static auto skip(const B& Bench, int) -> decltype(Bench.skip()) {
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return Bench.skip();
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}
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template <class B>
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static auto skip(const B& Bench, char) {
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return false;
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}
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template <class B, class Args, size_t... Is>
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void makeBenchmarkFromValuesImpl(const Args& A, std::index_sequence<Is...>) {
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for (auto& V : A) {
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B Bench{std::get<Is>(V)...};
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if (!internal::skip(Bench, 0)) {
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benchmark::RegisterBenchmark(Bench.name().c_str(),
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[=](benchmark::State& S) { Bench.run(S); });
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}
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}
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}
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template <class B, class... Args>
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void makeBenchmarkFromValues(const std::vector<std::tuple<Args...> >& A) {
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makeBenchmarkFromValuesImpl<B>(A, std::index_sequence_for<Args...>());
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}
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template <template <class...> class B, class Args, class... U>
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void makeBenchmarkImpl(const Args& A, std::tuple<U...> t) {
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makeBenchmarkFromValues<B<U...> >(A);
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}
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template <template <class...> class B, class Args, class... U,
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class... T, class... Tuples>
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void makeBenchmarkImpl(const Args& A, std::tuple<U...>, std::tuple<T...>,
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Tuples... rest) {
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(internal::makeBenchmarkImpl<B>(A, std::tuple<U..., T>(), rest...), ...);
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}
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template <class R, class T>
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void allValueCombinations(R& Result, const T& Final) {
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return Result.push_back(Final);
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}
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template <class R, class T, class V, class... Vs>
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void allValueCombinations(R& Result, const T& Prev, const V& Value,
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const Vs&... Values) {
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for (const auto& E : Value) {
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allValueCombinations(Result, std::tuple_cat(Prev, std::make_tuple(E)),
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Values...);
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}
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}
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} // namespace internal
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// CRTP class that enables using enum types as a dimension for
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// makeCartesianProductBenchmark below.
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// The type passed to `B` will be a std::integral_constant<E, e>, with the
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// additional static function `name()` that returns the stringified name of the
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// label.
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//
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// Eg:
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// enum class MyEnum { A, B };
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// struct AllMyEnum : EnumValuesAsTuple<AllMyEnum, MyEnum, 2> {
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// static constexpr absl::string_view Names[] = {"A", "B"};
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// };
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template <class Derived, class EnumType, size_t NumLabels>
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using EnumValuesAsTuple =
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decltype(internal::makeEnumValueTuple<Derived, EnumType>(
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std::make_index_sequence<NumLabels>{}));
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// Instantiates B<T0, T1, ..., TN> where <Ti...> are the combinations in the
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// cartesian product of `Tuples...`, and pass (arg0, ..., argN) as constructor
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// arguments where `(argi...)` are the combination in the cartesian product of
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// the runtime values of `A...`.
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// B<T...> requires:
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// - std::string name(args...): The name of the benchmark.
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// - void run(benchmark::State&, args...): The body of the benchmark.
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// It can also optionally provide:
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// - bool skip(args...): When `true`, skips the combination. Default is false.
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//
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// Returns int to facilitate registration. The return value is unspecified.
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template <template <class...> class B, class... Tuples, class... Args>
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int makeCartesianProductBenchmark(const Args&... A) {
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std::vector<std::tuple<typename Args::value_type...> > V;
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internal::allValueCombinations(V, std::tuple<>(), A...);
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internal::makeBenchmarkImpl<B>(V, std::tuple<>(), Tuples()...);
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return 0;
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}
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template <class B, class... Args>
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int makeCartesianProductBenchmark(const Args&... A) {
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std::vector<std::tuple<typename Args::value_type...> > V;
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internal::allValueCombinations(V, std::tuple<>(), A...);
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internal::makeBenchmarkFromValues<B>(V);
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return 0;
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}
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// When `opaque` is true, this function hides the runtime state of `value` from
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// the optimizer.
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// It returns `value`.
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template <class T>
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TEST_ALWAYS_INLINE inline T maybeOpaque(T value, bool opaque) {
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if (opaque) benchmark::DoNotOptimize(value);
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return value;
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}
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