48 lines
1.3 KiB
C++
48 lines
1.3 KiB
C++
/*
|
|
* Copyright (c) Facebook, Inc. and its affiliates.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <folly/Portability.h>
|
|
|
|
#include <cstdint>
|
|
|
|
#ifdef _MSC_VER
|
|
#include <intrin.h>
|
|
#endif
|
|
|
|
namespace folly {
|
|
inline void asm_volatile_memory() {
|
|
#if defined(__GNUC__) || defined(__clang__)
|
|
asm volatile("" : : : "memory");
|
|
#elif defined(_MSC_VER)
|
|
::_ReadWriteBarrier();
|
|
#endif
|
|
}
|
|
|
|
inline void asm_volatile_pause() {
|
|
#if defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))
|
|
::_mm_pause();
|
|
#elif defined(__i386__) || FOLLY_X64 || (__mips_isa_rev > 1)
|
|
asm volatile("pause");
|
|
#elif FOLLY_AARCH64 || (defined(__arm__) && !(__ARM_ARCH < 7))
|
|
asm volatile("yield");
|
|
#elif FOLLY_PPC64
|
|
asm volatile("or 27,27,27");
|
|
#endif
|
|
}
|
|
} // namespace folly
|