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remove dependency of memmove on memcpy direction

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this commit introduces a performance regression in many uses of
memmove, which will need to be addressed before the next release. i'm
making it as a temporary measure so that the restrict patch can be
committed without invoking undefined behavior when memmove calls
memcpy with overlapping regions.
This commit is contained in:
Rich Felker
2012-09-06 20:25:48 -04:00
parent fcfba99503
commit 594318fd3d
1 changed files with 4 additions and 5 deletions
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7
src/string/memmove.c
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@ -5,10 +5,9 @@ void *memmove(void *dest, const void *src, size_t n)
char *d = dest; char *d = dest;
const char *s = src; const char *s = src;
if (d==s) return d; if (d==s) return d;
if ((size_t)(d-s) < n) { if ((size_t)(d-s) < n)
while (n--) d[n] = s[n]; while (n--) d[n] = s[n];
else
while (n--) *d++ = *s++;
return dest; return dest;
}
/* Assumes memcpy is overlap-safe when dest < src */
return memcpy(d, s, n);
} }