63e88f80
 Hu Chunming
提交三方库
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// Copyright Oliver Kowalke 2017.
// 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)
#ifndef BOOST_CONTEXT_DETAIL_PREFETCH_H
#define BOOST_CONTEXT_DETAIL_PREFETCH_H
#include <cstddef>
#include <cstdint>
#include <boost/config.hpp>
#include <boost/predef.h>
#include <boost/context/detail/config.hpp>
#if BOOST_COMP_INTEL || BOOST_COMP_INTEL_EMULATED
#include <immintrin.h>
#endif
#if BOOST_COMP_MSVC && !defined(_M_ARM) && !defined(_M_ARM64)
#include <mmintrin.h>
#endif
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_PREFIX
#endif
namespace boost {
namespace context {
namespace detail {
#if BOOST_COMP_GNUC || BOOST_COMP_CLANG
#define BOOST_HAS_PREFETCH 1
BOOST_FORCEINLINE
void prefetch( void * addr) {
// L1 cache : hint == 1
__builtin_prefetch( addr, 1, 1);
}
#elif BOOST_COMP_INTEL || BOOST_COMP_INTEL_EMULATED
#define BOOST_HAS_PREFETCH 1
BOOST_FORCEINLINE
void prefetch( void * addr) {
// L1 cache : hint == _MM_HINT_T0
_mm_prefetch( (const char *)addr, _MM_HINT_T0);
}
#elif BOOST_COMP_MSVC && !defined(_M_ARM) && !defined(_M_ARM64)
#define BOOST_HAS_PREFETCH 1
BOOST_FORCEINLINE
void prefetch( void * addr) {
// L1 cache : hint == _MM_HINT_T0
_mm_prefetch( (const char *)addr, _MM_HINT_T0);
}
#endif
inline
void prefetch_range( void * addr, std::size_t len) {
#if defined(BOOST_HAS_PREFETCH)
void * vp = addr;
void * end = reinterpret_cast< void * >(
reinterpret_cast< uintptr_t >( addr) + static_cast< uintptr_t >( len) );
while ( vp < end) {
prefetch( vp);
vp = reinterpret_cast< void * >(
reinterpret_cast< uintptr_t >( vp) + static_cast< uintptr_t >( prefetch_stride) );
}
#endif
}
#undef BOOST_HAS_PREFETCH
}}}
#ifdef BOOST_HAS_ABI_HEADERS
# include BOOST_ABI_SUFFIX
#endif
#endif // BOOST_CONTEXT_DETAIL_PREFETCH_H
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