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| author | Wilco Dijkstra <wdijkstr@arm.com> | 2014-10-24 16:12:12 +0000 |
|---|---|---|
| committer | Wilco Dijkstra <wdijkstr@arm.com> | 2014-10-24 16:12:12 +0000 |
| commit | e80514b5a87c86a92352ce526c4b9db85f2a242c (patch) | |
| tree | eef102c72f8f43c86bbfc67b8343a6cf555bc47c /string/strncat.c | |
| parent | 6e46de42fe1695818a410a7b86d26be8b1527524 (diff) | |
| download | glibc-e80514b5a87c86a92352ce526c4b9db85f2a242c.zip glibc-e80514b5a87c86a92352ce526c4b9db85f2a242c.tar.gz glibc-e80514b5a87c86a92352ce526c4b9db85f2a242c.tar.bz2 | |
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/strncat.c')
| -rw-r--r-- | string/strncat.c | 6 |
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) { |