facebook/zstd
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Merge pull request #1226 from facebook/noPrefetch

Browse Source 
add build macro NO_PREFETCH
This commit is contained in:
Yann Collet 2018-07-06 17:56:35 -07:00 committed by GitHub
commit 14a92e90fe
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 13 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
lib/common/compiler.h
View File

@ -88,15 +88,20 @@
#endif #endif
#endif #endif
/* prefetch */ /* prefetch
#if defined(_MSC_VER) && (defined(_M_X64) || defined(_M_I86)) /* _mm_prefetch() is not defined outside of x86/x64 */ * can be disabled, by declaring NO_PREFETCH macro */
#if defined(NO_PREFETCH)
# define PREFETCH(ptr) /* disabled */
#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 */ # 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) # define PREFETCH(ptr) _mm_prefetch((const char*)ptr, _MM_HINT_T0)
#elif defined(__GNUC__) && ( (__GNUC__ >= 4) || ( (__GNUC__ == 3) && (__GNUC_MINOR__ >= 1) ) ) # elif defined(__GNUC__) && ( (__GNUC__ >= 4) || ( (__GNUC__ == 3) && (__GNUC_MINOR__ >= 1) ) )
# define PREFETCH(ptr) __builtin_prefetch(ptr, 0, 0) # define PREFETCH(ptr) __builtin_prefetch(ptr, 0, 0)
#else # else
# define PREFETCH(ptr) /* disabled */ # define PREFETCH(ptr) /* disabled */
#endif # endif
#endif /* NO_PREFETCH */
/* disable warnings */ /* disable warnings */
#ifdef _MSC_VER /* Visual Studio */ #ifdef _MSC_VER /* Visual Studio */