File Coverage

/usr/local/lib/perl5/site_perl/5.26.1/x86_64-linux/XS/libcatch.x/i/catch2/benchmark/catch_optimizer.hpp

Criterion	Covered	Total	%
statement	0	16	0.0
branch	0	4	0.0
condition			n/a
subroutine			n/a
pod			n/a
total	0	20	0.0

//              Copyright Catch2 Authors
// Distributed under the Boost Software License, Version 1.0.
//   (See accompanying file LICENSE_1_0.txt or copy at
//        https://www.boost.org/LICENSE_1_0.txt)

// SPDX-License-Identifier: BSL-1.0
// Adapted from donated nonius code.

#ifndef CATCH_OPTIMIZER_HPP_INCLUDED
#define CATCH_OPTIMIZER_HPP_INCLUDED

#if defined(_MSC_VER)
#   include  // atomic_thread_fence
#endif

#include

#include

namespace Catch {
    namespace Benchmark {
#if defined(__GNUC__) || defined(__clang__)
        template
        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
        inline void keep_memory(T* p) {
            // thanks @milleniumbug
            *reinterpret_cast(p) = *reinterpret_cast(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
        inline void deoptimize_value(T&& x) {
            keep_memory(&x);
        }

        template
        inline auto invoke_deoptimized(Fn&& fn, Args&&... args) -> std::enable_if_t::value> {
            deoptimize_value(CATCH_FORWARD(fn) (CATCH_FORWARD(args)...));
        }

        template
        inline auto invoke_deoptimized(Fn&& fn, Args&&... args) -> std::enable_if_t::value> {
            CATCH_FORWARD(fn) (CATCH_FORWARD(args)...);
        }
    } // namespace Benchmark
} // namespace Catch

#endif // CATCH_OPTIMIZER_HPP_INCLUDED