ceph/src/boost/boost/context/detail/prefetch.hpp

   1 //          Copyright Oliver Kowalke 2017.
   2 // Distributed under the Boost Software License, Version 1.0.
   3 //    (See accompanying file LICENSE_1_0.txt or copy at
   4 //          http://www.boost.org/LICENSE_1_0.txt)
   5
   6 #ifndef BOOST_CONTEXT_DETAIL_PREFETCH_H
   7 #define BOOST_CONTEXT_DETAIL_PREFETCH_H
   8
   9 #include <cstddef>
  10 #include <cstdint>
  11
  12 #include <boost/config.hpp>
  13 #include <boost/predef.h>
  14
  15 #include <boost/context/detail/config.hpp>
  16
  17 #if BOOST_COMP_INTEL || BOOST_COMP_INTEL_EMULATED
  18 #include <immintrin.h>
  19 #endif
  20
  21 #if BOOST_COMP_MSVC
  22 #include <mmintrin.h>
  23 #endif
  24
  25 #ifdef BOOST_HAS_ABI_HEADERS
  26 #  include BOOST_ABI_PREFIX
  27 #endif
  28
  29 namespace boost {
  30 namespace context {
  31 namespace detail {
  32
  33 #if BOOST_COMP_GNUC || BOOST_COMP_CLANG
  34 #define BOOST_HAS_PREFETCH 1
  35 BOOST_FORCEINLINE
  36 void prefetch( void * addr) {
  37     // L1 cache : hint == 1
  38     __builtin_prefetch( addr, 1, 1);
  39 }
  40 #elif BOOST_COMP_INTEL || BOOST_COMP_INTEL_EMULATED
  41 #define BOOST_HAS_PREFETCH 1
  42 BOOST_FORCEINLINE
  43 void prefetch( void * addr) {
  44     // L1 cache : hint == _MM_HINT_T0
  45     _mm_prefetch( (const char *)addr, _MM_HINT_T0);
  46 }
  47 #elif BOOST_COMP_MSVC
  48 #define BOOST_HAS_PREFETCH 1
  49 BOOST_FORCEINLINE
  50 void prefetch( void * addr) {
  51     // L1 cache : hint == _MM_HINT_T0
  52     _mm_prefetch( (const char *)addr, _MM_HINT_T0);
  53 }
  54 #endif
  55
  56 inline
  57 void prefetch_range( void * addr, std::size_t len) {
  58 #if defined(BOOST_HAS_PREFETCH)
  59     void * vp = addr;
  60     void * end = reinterpret_cast< void * >(
  61         reinterpret_cast< uintptr_t >( addr) + static_cast< uintptr_t >( len) );
  62     while ( vp < end) {
  63         prefetch( vp);
  64         vp = reinterpret_cast< void * >(
  65             reinterpret_cast< uintptr_t >( vp) + static_cast< uintptr_t >( prefetch_stride) );
  66     }
  67 #endif
  68 }
  69
  70 #undef BOOST_HAS_PREFETCH
  71
  72 }}}
  73
  74 #ifdef BOOST_HAS_ABI_HEADERS
  75 #  include BOOST_ABI_SUFFIX
  76 #endif
  77
  78 #endif // BOOST_CONTEXT_DETAIL_PREFETCH_H