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ensure memcpy with rep stosb is only used on windows

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This commit is contained in:
Daan Leijen 2021-01-29 16:09:09 -08:00
parent 9b966c3492
commit 0a06884732
1 changed files with 9 additions and 13 deletions
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22
include/mimalloc-internal.h
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@ -172,23 +172,19 @@ 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)
// -----------------------------------------------------------------------------------
// On windows x86/x64 with msvc/clang-cl, use `rep movsb` for `memcpy` (issue #201)
// -----------------------------------------------------------------------------------
#if defined(_WIN32) && (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;
static inline void _mi_memcpy_rep_movsb(void* d, const void* s, size_t n) {
__movsb((unsigned char*)d, (const unsigned char*)s, n);
}
#define _mi_memcpy(d,s,n) _mi_memcpy_rep_movsb(d,s,n)
#else
#define _mi_memcpy memcpy
#define _mi_memcpy(d,s,n) memcpy(d,s,n)
#endif