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fixed PREFETCH() macro

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for corner cases and platforms without this instruction
This commit is contained in:
Yann Collet 2018-09-12 16:15:37 -07:00
parent 44d3b83bb1
commit 2618253da2
1 changed files with 11 additions and 9 deletions
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20
lib/common/compiler.h
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@ -91,25 +91,27 @@
/* prefetch
* can be disabled, by declaring NO_PREFETCH macro */
#if defined(NO_PREFETCH)
# define PREFETCH(ptr) /* disabled */
# define PREFETCH(ptr) (void)(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 */
# define PREFETCH(ptr) _mm_prefetch((const char*)ptr, _MM_HINT_T1)
# define PREFETCH(ptr) _mm_prefetch((const char*)(ptr), _MM_HINT_T1)
# elif defined(__GNUC__) && ( (__GNUC__ >= 4) || ( (__GNUC__ == 3) && (__GNUC_MINOR__ >= 1) ) )
# define PREFETCH(ptr) __builtin_prefetch(ptr, 0 /* rw==read */, 2 /* locality */)
# define PREFETCH(ptr) __builtin_prefetch((ptr), 0 /* rw==read */, 2 /* locality */)
# else
# define PREFETCH(ptr) /* disabled */
# define PREFETCH(ptr) (void)(ptr) /* disabled */
# endif
#endif /* NO_PREFETCH */
#define CACHELINE_SIZE 64
#define PREFETCH_AREA(ptr, size) { \
size_t pos; \
for (pos=0; pos<size; pos+=CACHELINE_SIZE) { \
PREFETCH( (const char*)ptr + pos); \
} \
#define PREFETCH_AREA(p, s) { \
const char* const _ptr = (const char*)(p); \
size_t const _size = (size_t)(s); \
size_t _pos; \
for (_pos=0; _pos<_size; _pos+=CACHELINE_SIZE) { \
PREFETCH(_ptr + _pos); \
} \
}
/* disable warnings */