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authorWilco Dijkstra <wdijkstr@arm.com>2014-10-24 16:08:42 +0000
committerWilco Dijkstra <wdijkstr@arm.com>2014-10-24 16:08:42 +0000
commit6e46de42fe1695818a410a7b86d26be8b1527524 (patch)
treecb94f4c31ba74df526bffa1b6ca0713e22a0fa53 /string
parent6a9ad2faee48c5a9befd5ad6af79df37e4ea5436 (diff)
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This patch improves strcat performance by using strlen and strcpy. Strlen has a fast C
implementation, so this improves performance even on targets which don't have an optimized strlen and strcpy - it is 25% faster in bench-strcat. On targets which don't provide an optimized strcat but which do have an optimized strlen and strcpy, performance gain is > 2x.
Diffstat (limited to 'string')
-rw-r--r--string/strcat.c21
1 files changed, 1 insertions, 20 deletions
diff --git a/string/strcat.c b/string/strcat.c
index 2cbe8b3..983d115 100644
--- a/string/strcat.c
+++ b/string/strcat.c
@@ -23,26 +23,7 @@
char *
strcat (char *dest, const char *src)
{
- char *s1 = dest;
- const char *s2 = src;
- char c;
-
- /* Find the end of the string. */
- do
- c = *s1++;
- while (c != '\0');
-
- /* Make S1 point before the next character, so we can increment
- it while memory is read (wins on pipelined cpus). */
- s1 -= 2;
-
- do
- {
- c = *s2++;
- *++s1 = c;
- }
- while (c != '\0');
-
+ strcpy (dest + strlen (dest), src);
return dest;
}
libc_hidden_builtin_def (strcat)