mirror/glibc
2
0
Fork 0
mirror of git://sourceware.org/git/glibc.git synced 2025-01-18 12:16:13 +08:00
Code Issues Packages Projects Releases Wiki Activity

Improve memccpy performance by using memchr/memcpy/mempcpy rather than

Browse Source 
a byte loop. Overall performance on bench-memccpy is > 2x faster when
using the C implementation of memchr and an optimized memcpy.
This commit is contained in:
Wilco Dijkstra 2015-08-05 15:24:06 +01:00
parent f6482cf29d
commit f29ac72eff
2 changed files with 9 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
ChangeLog
View File

@ -1,3 +1,8 @@
2015-08-05 Wilco Dijkstra <wdijkstr@arm.com>
* string/memccpy.c (memccpy):
Improve performance by using memchr/memcpy/__mempcpy.
2015-08-05 Wilco Dijkstra <wdijkstr@arm.com> 2015-08-05 Wilco Dijkstra <wdijkstr@arm.com>
* string/strncpy.c (strncpy): * string/strncpy.c (strncpy):

11
string/memccpy.c
View File

@ -26,15 +26,12 @@
void * void *
__memccpy (void *dest, const void *src, int c, size_t n) __memccpy (void *dest, const void *src, int c, size_t n)
{ {
const char *s = src; void *p = memchr (src, c, n);
char *d = dest;
const char x = c;
size_t i = n;
while (i-- > 0) if (p != NULL)
if ((*d++ = *s++) == x) return __mempcpy (dest, src, p - src + 1);
return d;
memcpy (dest, src, n);
return NULL; return NULL;
} }