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69 lines
2.1 KiB
69 lines
2.1 KiB
/*
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* Created by Joachim on 16/04/2019.
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* Adapted from donated nonius code.
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*
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* Distributed under the Boost Software License, Version 1.0. (See accompanying
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* file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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*/
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// Hinting the optimizer
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#ifndef TWOBLUECUBES_CATCH_OPTIMIZER_HPP_INCLUDED
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#define TWOBLUECUBES_CATCH_OPTIMIZER_HPP_INCLUDED
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#if defined(_MSC_VER)
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# include <atomic> // atomic_thread_fence
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#endif
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namespace Catch {
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namespace Benchmark {
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#if defined(__GNUC__) || defined(__clang__)
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template <typename T>
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inline void keep_memory(T* p) {
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asm volatile("" : : "g"(p) : "memory");
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}
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inline void keep_memory() {
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asm volatile("" : : : "memory");
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}
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namespace Detail {
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inline void optimizer_barrier() { keep_memory(); }
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} // namespace Detail
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#elif defined(_MSC_VER)
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#pragma optimize("", off)
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template <typename T>
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inline void keep_memory(T* p) {
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// thanks @milleniumbug
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*reinterpret_cast<char volatile*>(p) = *reinterpret_cast<char const volatile*>(p);
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}
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// TODO equivalent keep_memory()
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#pragma optimize("", on)
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namespace Detail {
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inline void optimizer_barrier() {
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std::atomic_thread_fence(std::memory_order_seq_cst);
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}
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} // namespace Detail
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#endif
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template <typename T>
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inline void deoptimize_value(T&& x) {
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keep_memory(&x);
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}
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template <typename Fn, typename... Args>
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inline auto invoke_deoptimized(Fn&& fn, Args&&... args) -> typename std::enable_if<!std::is_same<void, decltype(fn(args...))>::value>::type {
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deoptimize_value(std::forward<Fn>(fn) (std::forward<Args...>(args...)));
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}
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template <typename Fn, typename... Args>
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inline auto invoke_deoptimized(Fn&& fn, Args&&... args) -> typename std::enable_if<std::is_same<void, decltype(fn(args...))>::value>::type {
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std::forward<Fn>(fn) (std::forward<Args...>(args...));
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}
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} // namespace Benchmark
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} // namespace Catch
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#endif // TWOBLUECUBES_CATCH_OPTIMIZER_HPP_INCLUDED
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