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Merge pull request #253 from haneefmubarak/memcpy-rep-movsb-windows-201

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resolve #201 with a platform-selective REP MOVSB implementation
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Daan 2021-01-29 16:00:00 -08:00 • committed by GitHub
commit 9b966c3492
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8 changed files with 29 additions and 10 deletions
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19
include/mimalloc-internal.h
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@ -172,6 +172,25 @@ bool _mi_page_is_valid(mi_page_t* page);
#define EOVERFLOW (75)
#endif
// ------------------------------------------------------
// Fast `memcpy()` on x86(_64) platforms unavailable
// on Windows, use REP MOVSB if necessary
// ------------------------------------------------------
#if defined(_M_IX86) || defined(_M_X64)
#include <intrin.h>
#define _mi_memcpy _mi_memcpy_rep_movsb
static inline void _mi_memcpy_rep_movsb (void *d, const void *s, size_t n) {
unsigned char* Destination = (unsigned char*) d;
unsigned const char* Source = (unsigned const char*) s;
size_t Count = n;
__movsb(Destination, Source, Count);
return;
}
#else
#define _mi_memcpy memcpy
#endif
/* -----------------------------------------------------------
Inlined definitions