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llvm-project/libcxx/test/benchmarks/libcxxabi/dynamic_cast.bench.cpp
Louis Dionne b2d2494731
[libc++] Make benchmarks forward-compatible with the test suite (#114502) 
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.
2024-11-05 09:08:00 -05:00

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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03
#include <cstddef>
#include "benchmark/benchmark.h"
template <std::size_t Depth>
struct Chain : Chain<Depth - 1> {};
template <>
struct Chain<0> {
virtual ~Chain() noexcept = default;
};
template <std::size_t Index, std::size_t Depth>
struct Dag : Dag<Index, Depth - 1>, Dag<Index + 1, Depth - 1> {};
template <std::size_t Index>
struct Dag<Index, 0> {
virtual ~Dag() noexcept = default;
};
template <std::size_t Depth>
struct VChain : virtual VChain<Depth - 1> {};
template <>
struct VChain<0> {
virtual ~VChain() noexcept = default;
};
template <std::size_t Index, std::size_t Depth>
struct VDag : virtual VDag<Index, Depth - 1>, virtual VDag<Index + 1, Depth - 1> {};
template <std::size_t Index>
struct VDag<Index, 0> {
virtual ~VDag() noexcept = default;
};
template <typename Dyn, typename From, typename To = Dyn>
static void DynCast(benchmark::State& state) {
Dyn obj;
From* from_ptr = &obj;
for (auto _ : state) {
To* to_ptr = dynamic_cast<To*>(from_ptr);
benchmark::DoNotOptimize(to_ptr);
}
}
static void StaticCast(benchmark::State& state) {
Chain<9> obj;
Chain<0>* from_ptr = &obj;
for (auto _ : state) {
Chain<9>* to_ptr = static_cast<Chain<9>*>(from_ptr);
benchmark::DoNotOptimize(to_ptr);
}
}
// Downcast along a chain from base to the most derived type
BENCHMARK(DynCast<Chain<1>, Chain<0>>)->Name("Chain, 1 level");
BENCHMARK(DynCast<Chain<2>, Chain<0>>)->Name("Chain, 2 levels");
BENCHMARK(DynCast<Chain<3>, Chain<0>>)->Name("Chain, 3 levels");
BENCHMARK(DynCast<Chain<4>, Chain<0>>)->Name("Chain, 4 levels");
BENCHMARK(DynCast<Chain<5>, Chain<0>>)->Name("Chain, 5 levels");
BENCHMARK(DynCast<Chain<6>, Chain<0>>)->Name("Chain, 6 levels");
BENCHMARK(DynCast<Chain<7>, Chain<0>>)->Name("Chain, 7 levels");
BENCHMARK(DynCast<Chain<8>, Chain<0>>)->Name("Chain, 8 levels");
BENCHMARK(DynCast<Chain<9>, Chain<0>>)->Name("Chain, 9 levels");
// Downcast along a chain from base to the middle of the chain
BENCHMARK(DynCast<Chain<2>, Chain<0>, Chain<1>>)->Name("Chain middle, 1 level");
BENCHMARK(DynCast<Chain<4>, Chain<0>, Chain<2>>)->Name("Chain middle, 2 levels");
BENCHMARK(DynCast<Chain<6>, Chain<0>, Chain<3>>)->Name("Chain middle, 3 levels");
BENCHMARK(DynCast<Chain<8>, Chain<0>, Chain<4>>)->Name("Chain middle, 4 levels");
// Downcast along a chain that fails
BENCHMARK(DynCast<Chain<1>, Chain<0>, Chain<9>>)->Name("Chain fail, 1 level");
BENCHMARK(DynCast<Chain<2>, Chain<0>, Chain<9>>)->Name("Chain fail, 2 levels");
BENCHMARK(DynCast<Chain<3>, Chain<0>, Chain<9>>)->Name("Chain fail, 3 levels");
BENCHMARK(DynCast<Chain<4>, Chain<0>, Chain<9>>)->Name("Chain fail, 4 levels");
BENCHMARK(DynCast<Chain<5>, Chain<0>, Chain<9>>)->Name("Chain fail, 5 levels");
BENCHMARK(DynCast<Chain<6>, Chain<0>, Chain<9>>)->Name("Chain fail, 6 levels");
BENCHMARK(DynCast<Chain<7>, Chain<0>, Chain<9>>)->Name("Chain fail, 7 levels");
BENCHMARK(DynCast<Chain<8>, Chain<0>, Chain<9>>)->Name("Chain fail, 8 levels");
// Downcast along a virtual inheritance chain from base to the most derived type
BENCHMARK(DynCast<VChain<1>, VChain<0>>)->Name("VChain, 1 level");
BENCHMARK(DynCast<VChain<2>, VChain<0>>)->Name("VChain, 2 levels");
BENCHMARK(DynCast<VChain<3>, VChain<0>>)->Name("VChain, 3 levels");
BENCHMARK(DynCast<VChain<4>, VChain<0>>)->Name("VChain, 4 levels");
BENCHMARK(DynCast<VChain<5>, VChain<0>>)->Name("VChain, 5 levels");
// Downcast along a virtual inheritance chain from base to the middle of the chain
BENCHMARK(DynCast<VChain<2>, VChain<0>, VChain<1>>)->Name("VChain middle, 1 level");
BENCHMARK(DynCast<VChain<4>, VChain<0>, VChain<2>>)->Name("VChain middle, 2 levels");
BENCHMARK(DynCast<VChain<6>, VChain<0>, VChain<3>>)->Name("VChain middle, 3 levels");
BENCHMARK(DynCast<VChain<8>, VChain<0>, VChain<4>>)->Name("VChain middle, 4 levels");
// Downcast along a virtual chain that fails
BENCHMARK(DynCast<VChain<1>, VChain<0>, VChain<8>>)->Name("VChain fail, 1 level");
BENCHMARK(DynCast<VChain<2>, VChain<0>, VChain<8>>)->Name("VChain fail, 2 levels");
BENCHMARK(DynCast<VChain<3>, VChain<0>, VChain<8>>)->Name("VChain fail, 3 levels");
BENCHMARK(DynCast<VChain<4>, VChain<0>, VChain<8>>)->Name("VChain fail, 4 levels");
BENCHMARK(DynCast<VChain<5>, VChain<0>, VChain<8>>)->Name("VChain fail, 5 levels");
// Downcast along a DAG from base to the most derived type
BENCHMARK(DynCast<Dag<0, 3>, Dag<3, 0>>)->Name("DAG rightmost, 3 levels");
BENCHMARK(DynCast<Dag<0, 4>, Dag<4, 0>>)->Name("DAG rightmost, 4 levels");
BENCHMARK(DynCast<Dag<0, 5>, Dag<5, 0>>)->Name("DAG rightmost, 5 levels");
BENCHMARK(DynCast<Dag<0, 3>, Dag<0, 0>>)->Name("DAG leftmost, 3 levels");
BENCHMARK(DynCast<Dag<0, 4>, Dag<0, 0>>)->Name("DAG leftmost, 4 levels");
BENCHMARK(DynCast<Dag<0, 5>, Dag<0, 0>>)->Name("DAG leftmost, 5 levels");
// Downcast along a DAG from base to the middle of the DAG
BENCHMARK(DynCast<Dag<0, 4>, Dag<4, 0>, Dag<3, 1>>)->Name("DAG rightmost middle, 1 level");
BENCHMARK(DynCast<Dag<0, 4>, Dag<4, 0>, Dag<2, 2>>)->Name("DAG rightmost middle, 2 levels");
BENCHMARK(DynCast<Dag<0, 4>, Dag<4, 0>, Dag<1, 3>>)->Name("DAG rightmost middle, 3 levels");
BENCHMARK(DynCast<Dag<0, 4>, Dag<0, 0>, Dag<0, 1>>)->Name("DAG leftmost middle, 1 level");
BENCHMARK(DynCast<Dag<0, 4>, Dag<0, 0>, Dag<0, 2>>)->Name("DAG leftmost middle, 2 levels");
BENCHMARK(DynCast<Dag<0, 4>, Dag<0, 0>, Dag<0, 3>>)->Name("DAG leftmost middle, 3 levels");
// Sidecast along a DAG
BENCHMARK(DynCast<Dag<0, 3>, Dag<3, 0>, Dag<0, 0>>)->Name("DAG sidecast, 3 levels");
BENCHMARK(DynCast<Dag<0, 3>, Dag<2, 1>, Dag<0, 1>>)->Name("DAG sidecast, 2 levels");
BENCHMARK(DynCast<Dag<0, 3>, Dag<1, 2>, Dag<0, 2>>)->Name("DAG sidecast, 1 level");
// Sidecast along a DAG that fails
BENCHMARK(DynCast<Dag<0, 3>, Dag<3, 0>, Dag<0, 4>>)->Name("DAG sidecast fail, 3 levels");
BENCHMARK(DynCast<Dag<0, 3>, Dag<2, 1>, Dag<0, 4>>)->Name("DAG sidecast fail, 2 levels");
BENCHMARK(DynCast<Dag<0, 3>, Dag<1, 2>, Dag<0, 4>>)->Name("DAG sidecast fail, 1 level");
// Downcast along a virtual inheritance DAG from base to the most derived type
BENCHMARK(DynCast<VDag<0, 3>, VDag<3, 0>>)->Name("VDAG rightmost, 3 levels");
BENCHMARK(DynCast<VDag<0, 4>, VDag<4, 0>>)->Name("VDAG rightmost, 4 levels");
BENCHMARK(DynCast<VDag<0, 5>, VDag<5, 0>>)->Name("VDAG rightmost, 5 levels");
BENCHMARK(DynCast<VDag<0, 3>, VDag<0, 0>>)->Name("VDAG leftmost, 3 levels");
BENCHMARK(DynCast<VDag<0, 4>, VDag<0, 0>>)->Name("VDAG leftmost, 4 levels");
BENCHMARK(DynCast<VDag<0, 5>, VDag<0, 0>>)->Name("VDAG leftmost, 5 levels");
// Downcast along a virtual inheritance DAG from base to the middle of the DAG
BENCHMARK(DynCast<VDag<0, 3>, VDag<3, 0>, VDag<2, 1>>)->Name("VDAG rightmost middle, 1 level");
BENCHMARK(DynCast<VDag<0, 4>, VDag<4, 0>, VDag<2, 2>>)->Name("VDAG rightmost middle, 2 levels");
BENCHMARK(DynCast<VDag<0, 5>, VDag<5, 0>, VDag<2, 3>>)->Name("VDAG rightmost middle, 3 levels");
BENCHMARK(DynCast<VDag<0, 3>, VDag<0, 0>, VDag<0, 1>>)->Name("VDAG leftmost middle, 1 level");
BENCHMARK(DynCast<VDag<0, 4>, VDag<0, 0>, VDag<0, 2>>)->Name("VDAG leftmost middle, 2 levels");
BENCHMARK(DynCast<VDag<0, 5>, VDag<0, 0>, VDag<0, 3>>)->Name("VDAG leftmost middle, 3 levels");
// Sidecast along a virtual inheritance DAG
BENCHMARK(DynCast<VDag<0, 3>, VDag<3, 0>, VDag<0, 0>>)->Name("VDAG sidecast, 3 levels");
BENCHMARK(DynCast<VDag<0, 3>, VDag<2, 1>, VDag<0, 1>>)->Name("VDAG sidecast, 2 levels");
BENCHMARK(DynCast<VDag<0, 3>, VDag<1, 2>, VDag<0, 2>>)->Name("VDAG sidecast, 1 level");
// Sidecast along a virtual inheritance DAG that fails
BENCHMARK(DynCast<VDag<0, 3>, VDag<3, 0>, VDag<0, 4>>)->Name("VDAG sidecast fail, 3 levels");
BENCHMARK(DynCast<VDag<0, 3>, VDag<2, 1>, VDag<0, 4>>)->Name("VDAG sidecast fail, 2 levels");
BENCHMARK(DynCast<VDag<0, 3>, VDag<1, 2>, VDag<0, 4>>)->Name("VDAG sidecast fail, 1 level");
// Cast to complete object pointer
BENCHMARK(DynCast<Chain<8>, Chain<0>, void>)->Name("Chain to complete");
BENCHMARK(DynCast<VChain<5>, VChain<0>, void>)->Name("VChain to complete");
BENCHMARK(DynCast<Dag<0, 3>, Dag<3, 0>, void>)->Name("DAG to complete");
BENCHMARK(DynCast<VDag<0, 3>, VDag<3, 0>, void>)->Name("VDAG to complete");
// Static cast as the baseline.
BENCHMARK(StaticCast)->Name("Static");
BENCHMARK_MAIN();
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