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Merge pull request #1226 from facebook/noPrefetch

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add build macro NO_PREFETCH
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Yann Collet 2018-07-06 17:56:35 -07:00 committed by GitHub
commit 14a92e90fe
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1 changed files with 13 additions and 8 deletions
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21
lib/common/compiler.h
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@ -88,15 +88,20 @@
#endif
#endif
/* prefetch */
#if defined(_MSC_VER) && (defined(_M_X64) || defined(_M_I86)) /* _mm_prefetch() is not defined outside of x86/x64 */
# include <mmintrin.h> /* https://msdn.microsoft.com/fr-fr/library/84szxsww(v=vs.90).aspx */
# define PREFETCH(ptr) _mm_prefetch((const char*)ptr, _MM_HINT_T0)
#elif defined(__GNUC__) && ( (__GNUC__ >= 4) || ( (__GNUC__ == 3) && (__GNUC_MINOR__ >= 1) ) )
# define PREFETCH(ptr) __builtin_prefetch(ptr, 0, 0)
#else
/* prefetch
* can be disabled, by declaring NO_PREFETCH macro */
#if defined(NO_PREFETCH)
# define PREFETCH(ptr) /* disabled */
#endif
#else
# if defined(_MSC_VER) && (defined(_M_X64) || defined(_M_I86)) /* _mm_prefetch() is not defined outside of x86/x64 */
# include <mmintrin.h> /* https://msdn.microsoft.com/fr-fr/library/84szxsww(v=vs.90).aspx */
# define PREFETCH(ptr) _mm_prefetch((const char*)ptr, _MM_HINT_T0)
# elif defined(__GNUC__) && ( (__GNUC__ >= 4) || ( (__GNUC__ == 3) && (__GNUC_MINOR__ >= 1) ) )
# define PREFETCH(ptr) __builtin_prefetch(ptr, 0, 0)
# else
# define PREFETCH(ptr) /* disabled */
# endif
#endif /* NO_PREFETCH */
/* disable warnings */
#ifdef _MSC_VER /* Visual Studio */