b2d2494731
This patch fixes warnings and errors that come up when running the benchmarks as part of the test suite. It also adds the necessary Lit annotations to make it pass in various configurations and increases the portability of the benchmarks.
80 lines
2.4 KiB
C++
80 lines
2.4 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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// UNSUPPORTED: c++03, c++11
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#include <cassert>
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#include <cstddef>
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#include <utility>
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#include "benchmark/benchmark.h"
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template <std::size_t Indx, std::size_t Depth>
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struct C : public virtual C<Indx, Depth - 1>, public virtual C<Indx + 1, Depth - 1> {
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virtual ~C() {}
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};
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template <std::size_t Indx>
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struct C<Indx, 0> {
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virtual ~C() {}
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};
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template <std::size_t Indx, std::size_t Depth>
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struct B : public virtual C<Indx, Depth - 1>, public virtual C<Indx + 1, Depth - 1> {};
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template <class Indx, std::size_t Depth>
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struct makeB;
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template <std::size_t... Indx, std::size_t Depth>
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struct makeB<std::index_sequence<Indx...>, Depth> : public B<Indx, Depth>... {};
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template <std::size_t Width, std::size_t Depth>
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struct A : public makeB<std::make_index_sequence<Width>, Depth> {};
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constexpr std::size_t Width = 10;
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constexpr std::size_t Depth = 5;
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template <typename Destination>
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void CastTo(benchmark::State& state) {
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A<Width, Depth> a;
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auto base = static_cast<C<Width / 2, 0>*>(&a);
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Destination* b = nullptr;
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for (auto _ : state) {
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b = dynamic_cast<Destination*>(base);
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benchmark::DoNotOptimize(b);
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}
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assert(b != 0);
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}
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BENCHMARK(CastTo<B<Width / 2, Depth>>);
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BENCHMARK(CastTo<A<Width, Depth>>);
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BENCHMARK_MAIN();
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/**
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* Benchmark results: (release builds)
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*
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* libcxxabi:
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* ----------------------------------------------------------------------
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* Benchmark Time CPU Iterations
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* ----------------------------------------------------------------------
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* CastTo<B<Width / 2, Depth>> 1997 ns 1997 ns 349247
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* CastTo<A<Width, Depth>> 256 ns 256 ns 2733871
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*
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* libsupc++:
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* ----------------------------------------------------------------------
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* Benchmark Time CPU Iterations
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* ----------------------------------------------------------------------
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* CastTo<B<Width / 2, Depth>> 5240 ns 5240 ns 133091
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* CastTo<A<Width, Depth>> 866 ns 866 ns 808600
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*
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*
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*/
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