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authorWilco Dijkstra <wdijkstr@arm.com>2015-02-27 14:41:46 +0000
committerWilco Dijkstra <wdijkstr@arm.com>2015-02-27 14:41:46 +0000
commitddcf6798d35beca3c4eec80ea448b57fd45558f4 (patch)
treeef2d72b01b83d428669e2d37f871b42d7878e4a0
parent49f476f4791ea6974a7f67bdc3251ab03822c2aa (diff)
Rather than using a C implementation of memset, directly call memset, which
typically has a much faster optimized implementation.
-rw-r--r--ChangeLog4
-rw-r--r--string/bzero.c57
2 files changed, 6 insertions, 55 deletions
diff --git a/ChangeLog b/ChangeLog
index 3b5caa532b..6eb5290fdb 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2015-02-27 Wilco Dijkstra wdijkstr@arm.com
+
+ * string/bzero.c (__bzero): Call memset for performance.
+
2015-02-27 John David Anglin <dave.anglin@bell.net>
* sysdeps/unix/sysv/linux/hppa/bits/fcntl.h (__O_SYNC): Change
diff --git a/string/bzero.c b/string/bzero.c
index a0e738e2a1..43e2b38780 100644
--- a/string/bzero.c
+++ b/string/bzero.c
@@ -17,66 +17,13 @@
<http://www.gnu.org/licenses/>. */
#include <string.h>
-#include <memcopy.h>
#undef __bzero
/* Set N bytes of S to 0. */
void
-__bzero (s, len)
- void *s;
- size_t len;
+__bzero (void *s, size_t len)
{
- long int dstp = (long int) s;
- const op_t zero = 0;
-
- if (len >= 8)
- {
- size_t xlen;
-
- /* There are at least some bytes to zero. No need to test
- for LEN == 0 in this alignment loop. */
- while (dstp % OPSIZ != 0)
- {
- ((byte *) dstp)[0] = 0;
- dstp += 1;
- len -= 1;
- }
-
- /* Write 8 op_t per iteration until less than 8 op_t remain. */
- xlen = len / (OPSIZ * 8);
- while (xlen != 0)
- {
- ((op_t *) dstp)[0] = zero;
- ((op_t *) dstp)[1] = zero;
- ((op_t *) dstp)[2] = zero;
- ((op_t *) dstp)[3] = zero;
- ((op_t *) dstp)[4] = zero;
- ((op_t *) dstp)[5] = zero;
- ((op_t *) dstp)[6] = zero;
- ((op_t *) dstp)[7] = zero;
- dstp += 8 * OPSIZ;
- xlen -= 1;
- }
- len %= OPSIZ * 8;
-
- /* Write 1 op_t per iteration until less than op_t remain. */
- xlen = len / OPSIZ;
- while (xlen != 0)
- {
- ((op_t *) dstp)[0] = zero;
- dstp += OPSIZ;
- xlen -= 1;
- }
- len %= OPSIZ;
- }
-
- /* Write the last few bytes. */
- while (len != 0)
- {
- ((byte *) dstp)[0] = 0;
- dstp += 1;
- len -= 1;
- }
+ memset (s, '\0', len);
}
weak_alias (__bzero, bzero)