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authorWilco Dijkstra <wdijkstr@arm.com>2014-10-24 16:12:12 +0000
committerWilco Dijkstra <wdijkstr@arm.com>2014-10-24 16:12:12 +0000
commite80514b5a87c86a92352ce526c4b9db85f2a242c (patch)
treeeef102c72f8f43c86bbfc67b8343a6cf555bc47c /string
parent6e46de42fe1695818a410a7b86d26be8b1527524 (diff)
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This patch improves strncat performance by using strlen. Strlen has a fast C implementation, so
this will improve performance even on targets which don't have an optimized strlen. It is about twice as fast as the original strncat in bench-strncat.
Diffstat (limited to 'string')
-rw-r--r--string/strncat.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/string/strncat.c b/string/strncat.c
index 7ac4456..6d29114 100644
--- a/string/strncat.c
+++ b/string/strncat.c
@@ -33,13 +33,11 @@ STRNCAT (char *s1, const char *s2, size_t n)
char *s = s1;
/* Find the end of S1. */
- do
- c = *s1++;
- while (c != '\0');
+ s1 += strlen (s1);
/* Make S1 point before next character, so we can increment
it while memory is read (wins on pipelined cpus). */
- s1 -= 2;
+ s1 -= 1;
if (n >= 4)
{