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