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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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26
libc/intrin/repmovsb.h Normal file
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#ifndef COSMOPOLITAN_LIBC_INTRIN_REPMOVSB_H_
#define COSMOPOLITAN_LIBC_INTRIN_REPMOVSB_H_
#if !(__ASSEMBLER__ + __LINKER__ + 0)
static void repmovsb(void **dest, const void **src, size_t cx) {
char *di = (char *)*dest;
const char *si = (const char *)*src;
while (cx) *di++ = *si++, cx--;
*dest = di, *src = si;
}
#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
#define repmovsb(DI, SI, CX) \
({ \
void *Di = *(DI); \
const void *Si = *(SI); \
size_t Cx = (CX); \
asm("rep movsb" \
: "=D"(Di), "=S"(Si), "=c"(Cx), "=m"(*(char(*)[Cx])Di) \
: "0"(Di), "1"(Si), "2"(Cx), "m"(*(const char(*)[Cx])Si)); \
*(DI) = Di, *(SI) = Si; \
})
#endif
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_INTRIN_REPMOVSB_H_ */