blob: 61e6571f6e366e9d4d031d62baf090ec71a834ab (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
// Copyright Catch2 Authors
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE.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) || defined(__IAR_SYSTEMS_ICC__)
# include <atomic> // atomic_thread_fence
#endif
#include <catch2/internal/catch_move_and_forward.hpp>
#include <type_traits>
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) || defined(__IAR_SYSTEMS_ICC__)
#if defined(_MSVC_VER)
#pragma optimize("", off)
#elif defined(__IAR_SYSTEMS_ICC__)
// For IAR the pragma only affects the following function
#pragma optimize=disable
#endif
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()
#if defined(_MSVC_VER)
#pragma optimize("", on)
#endif
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) -> std::enable_if_t<!std::is_same<void, decltype(fn(args...))>::value> {
deoptimize_value(CATCH_FORWARD(fn) (CATCH_FORWARD(args)...));
}
template <typename Fn, typename... Args>
inline auto invoke_deoptimized(Fn&& fn, Args&&... args) -> std::enable_if_t<std::is_same<void, decltype(fn(args...))>::value> {
CATCH_FORWARD((fn)) (CATCH_FORWARD(args)...);
}
} // namespace Benchmark
} // namespace Catch
#endif // CATCH_OPTIMIZER_HPP_INCLUDED
|
