about summary refs log tree commit diff
diff options
context:
space:
mode:
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)
downloadglibc-ddcf6798d35beca3c4eec80ea448b57fd45558f4.tar.gz
glibc-ddcf6798d35beca3c4eec80ea448b57fd45558f4.tar.xz
glibc-ddcf6798d35beca3c4eec80ea448b57fd45558f4.zip
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)