generic-library/bionic
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Merge "libc: memmove(): non-overlapping block optim." into gingerbread

Browse Source
This commit is contained in:
David 'Digit' Turner 2010-09-28 00:15:05 -07:00 committed by Android (Google) Code Review
commit 79260746db
1 changed files with 5 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
libc/string/memmove.c
View File

@ -31,7 +31,11 @@ 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 highgly-optimized memcpy() if the destination
* is before the source, or if the two blocks are non-overlapping
*/
if (__builtin_expect((q < p || (q-p) <= (ptrdiff_t)n), 1)) {
return memcpy(dst, src, n);
} else {
#define PRELOAD_DISTANCE 64