//===----------------------------------------------------------------------===// // // 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 // //===----------------------------------------------------------------------===// #include #include "benchmark/benchmark.h" template struct Chain : Chain {}; template <> struct Chain<0> { virtual ~Chain() noexcept = default; }; template struct Dag : Dag, Dag {}; template struct Dag { virtual ~Dag() noexcept = default; }; template struct VChain : virtual VChain {}; template <> struct VChain<0> { virtual ~VChain() noexcept = default; }; template struct VDag : virtual VDag, virtual VDag {}; template struct VDag { virtual ~VDag() noexcept = default; }; template static void DynCast(benchmark::State& state) { Dyn obj; From* from_ptr = &obj; for (auto _ : state) { To* to_ptr = dynamic_cast(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*>(from_ptr); benchmark::DoNotOptimize(to_ptr); } } // Downcast along a chain from base to the most derived type BENCHMARK(DynCast, Chain<0>>)->Name("Chain, 1 level"); BENCHMARK(DynCast, Chain<0>>)->Name("Chain, 2 levels"); BENCHMARK(DynCast, Chain<0>>)->Name("Chain, 3 levels"); BENCHMARK(DynCast, Chain<0>>)->Name("Chain, 4 levels"); BENCHMARK(DynCast, Chain<0>>)->Name("Chain, 5 levels"); BENCHMARK(DynCast, Chain<0>>)->Name("Chain, 6 levels"); BENCHMARK(DynCast, Chain<0>>)->Name("Chain, 7 levels"); BENCHMARK(DynCast, Chain<0>>)->Name("Chain, 8 levels"); BENCHMARK(DynCast, Chain<0>>)->Name("Chain, 9 levels"); // Downcast along a chain from base to the middle of the chain BENCHMARK(DynCast, Chain<0>, Chain<1>>)->Name("Chain middle, 1 level"); BENCHMARK(DynCast, Chain<0>, Chain<2>>)->Name("Chain middle, 2 levels"); BENCHMARK(DynCast, Chain<0>, Chain<3>>)->Name("Chain middle, 3 levels"); BENCHMARK(DynCast, Chain<0>, Chain<4>>)->Name("Chain middle, 4 levels"); // Downcast along a chain that fails BENCHMARK(DynCast, Chain<0>, Chain<9>>)->Name("Chain fail, 1 level"); BENCHMARK(DynCast, Chain<0>, Chain<9>>)->Name("Chain fail, 2 levels"); BENCHMARK(DynCast, Chain<0>, Chain<9>>)->Name("Chain fail, 3 levels"); BENCHMARK(DynCast, Chain<0>, Chain<9>>)->Name("Chain fail, 4 levels"); BENCHMARK(DynCast, Chain<0>, Chain<9>>)->Name("Chain fail, 5 levels"); BENCHMARK(DynCast, Chain<0>, Chain<9>>)->Name("Chain fail, 6 levels"); BENCHMARK(DynCast, Chain<0>, Chain<9>>)->Name("Chain fail, 7 levels"); BENCHMARK(DynCast, 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<0>>)->Name("VChain, 1 level"); BENCHMARK(DynCast, VChain<0>>)->Name("VChain, 2 levels"); BENCHMARK(DynCast, VChain<0>>)->Name("VChain, 3 levels"); BENCHMARK(DynCast, VChain<0>>)->Name("VChain, 4 levels"); BENCHMARK(DynCast, VChain<0>>)->Name("VChain, 5 levels"); // Downcast along a virtual inheritance chain from base to the middle of the chain BENCHMARK(DynCast, VChain<0>, VChain<1>>)->Name("VChain middle, 1 level"); BENCHMARK(DynCast, VChain<0>, VChain<2>>)->Name("VChain middle, 2 levels"); BENCHMARK(DynCast, VChain<0>, VChain<3>>)->Name("VChain middle, 3 levels"); BENCHMARK(DynCast, VChain<0>, VChain<4>>)->Name("VChain middle, 4 levels"); // Downcast along a virtual chain that fails BENCHMARK(DynCast, VChain<0>, VChain<8>>)->Name("VChain fail, 1 level"); BENCHMARK(DynCast, VChain<0>, VChain<8>>)->Name("VChain fail, 2 levels"); BENCHMARK(DynCast, VChain<0>, VChain<8>>)->Name("VChain fail, 3 levels"); BENCHMARK(DynCast, VChain<0>, VChain<8>>)->Name("VChain fail, 4 levels"); BENCHMARK(DynCast, VChain<0>, VChain<8>>)->Name("VChain fail, 5 levels"); // Downcast along a DAG from base to the most derived type BENCHMARK(DynCast, Dag<3, 0>>)->Name("DAG rightmost, 3 levels"); BENCHMARK(DynCast, Dag<4, 0>>)->Name("DAG rightmost, 4 levels"); BENCHMARK(DynCast, Dag<5, 0>>)->Name("DAG rightmost, 5 levels"); BENCHMARK(DynCast, Dag<0, 0>>)->Name("DAG leftmost, 3 levels"); BENCHMARK(DynCast, Dag<0, 0>>)->Name("DAG leftmost, 4 levels"); BENCHMARK(DynCast, Dag<0, 0>>)->Name("DAG leftmost, 5 levels"); // Downcast along a DAG from base to the middle of the DAG BENCHMARK(DynCast, Dag<4, 0>, Dag<3, 1>>)->Name("DAG rightmost middle, 1 level"); BENCHMARK(DynCast, Dag<4, 0>, Dag<2, 2>>)->Name("DAG rightmost middle, 2 levels"); BENCHMARK(DynCast, Dag<4, 0>, Dag<1, 3>>)->Name("DAG rightmost middle, 3 levels"); BENCHMARK(DynCast, Dag<0, 0>, Dag<0, 1>>)->Name("DAG leftmost middle, 1 level"); BENCHMARK(DynCast, Dag<0, 0>, Dag<0, 2>>)->Name("DAG leftmost middle, 2 levels"); BENCHMARK(DynCast, Dag<0, 0>, Dag<0, 3>>)->Name("DAG leftmost middle, 3 levels"); // Sidecast along a DAG BENCHMARK(DynCast, Dag<3, 0>, Dag<0, 0>>)->Name("DAG sidecast, 3 levels"); BENCHMARK(DynCast, Dag<2, 1>, Dag<0, 1>>)->Name("DAG sidecast, 2 levels"); BENCHMARK(DynCast, Dag<1, 2>, Dag<0, 2>>)->Name("DAG sidecast, 1 level"); // Sidecast along a DAG that fails BENCHMARK(DynCast, Dag<3, 0>, Dag<0, 4>>)->Name("DAG sidecast fail, 3 levels"); BENCHMARK(DynCast, Dag<2, 1>, Dag<0, 4>>)->Name("DAG sidecast fail, 2 levels"); BENCHMARK(DynCast, 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<3, 0>>)->Name("VDAG rightmost, 3 levels"); BENCHMARK(DynCast, VDag<4, 0>>)->Name("VDAG rightmost, 4 levels"); BENCHMARK(DynCast, VDag<5, 0>>)->Name("VDAG rightmost, 5 levels"); BENCHMARK(DynCast, VDag<0, 0>>)->Name("VDAG leftmost, 3 levels"); BENCHMARK(DynCast, VDag<0, 0>>)->Name("VDAG leftmost, 4 levels"); BENCHMARK(DynCast, 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<3, 0>, VDag<2, 1>>)->Name("VDAG rightmost middle, 1 level"); BENCHMARK(DynCast, VDag<4, 0>, VDag<2, 2>>)->Name("VDAG rightmost middle, 2 levels"); BENCHMARK(DynCast, VDag<5, 0>, VDag<2, 3>>)->Name("VDAG rightmost middle, 3 levels"); BENCHMARK(DynCast, VDag<0, 0>, VDag<0, 1>>)->Name("VDAG leftmost middle, 1 level"); BENCHMARK(DynCast, VDag<0, 0>, VDag<0, 2>>)->Name("VDAG leftmost middle, 2 levels"); BENCHMARK(DynCast, VDag<0, 0>, VDag<0, 3>>)->Name("VDAG leftmost middle, 3 levels"); // Sidecast along a virtual inheritance DAG BENCHMARK(DynCast, VDag<3, 0>, VDag<0, 0>>)->Name("VDAG sidecast, 3 levels"); BENCHMARK(DynCast, VDag<2, 1>, VDag<0, 1>>)->Name("VDAG sidecast, 2 levels"); BENCHMARK(DynCast, VDag<1, 2>, VDag<0, 2>>)->Name("VDAG sidecast, 1 level"); // Sidecast along a virtual inheritance DAG that fails BENCHMARK(DynCast, VDag<3, 0>, VDag<0, 4>>)->Name("VDAG sidecast fail, 3 levels"); BENCHMARK(DynCast, VDag<2, 1>, VDag<0, 4>>)->Name("VDAG sidecast fail, 2 levels"); BENCHMARK(DynCast, VDag<1, 2>, VDag<0, 4>>)->Name("VDAG sidecast fail, 1 level"); // Cast to complete object pointer BENCHMARK(DynCast, Chain<0>, void>)->Name("Chain to complete"); BENCHMARK(DynCast, VChain<0>, void>)->Name("VChain to complete"); BENCHMARK(DynCast, Dag<3, 0>, void>)->Name("DAG to complete"); BENCHMARK(DynCast, VDag<3, 0>, void>)->Name("VDAG to complete"); // Static cast as the baseline. BENCHMARK(StaticCast)->Name("Static"); BENCHMARK_MAIN();