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am 5b81b918: libc: optimize memmove() with memcpy() if possible.

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Merge commit '5b81b918173b4bf446c1a85240c094e4dd77231f' into gingerbread-plus-aosp

* commit '5b81b918173b4bf446c1a85240c094e4dd77231f':
  libc: optimize memmove() with memcpy() if possible.
This commit is contained in:
David 'Digit' Turner 2010-10-07 14:48:31 -07:00 committed by Android Git Automerger
commit 5dce6d195a
1 changed files with 4 additions and 1 deletions
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5
libc/string/memmove.c
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@ -31,7 +31,10 @@ void *memmove(void *dst, const void *src, size_t n)
{
const char *p = src;
char *q = dst;
if (__builtin_expect(q < p, 1)) {
/* We can use the optimized memcpy if the destination is below the
* source (i.e. q < p), or if it is completely over it (i.e. q >= p+n).
*/
if (__builtin_expect((q < p) || ((size_t)(q - p) >= n), 1)) {
return memcpy(dst, src, n);
} else {
#define PRELOAD_DISTANCE 64