From 6e46de42fe1695818a410a7b86d26be8b1527524 Mon Sep 17 00:00:00 2001 From: Wilco Dijkstra Date: Fri, 24 Oct 2014 16:08:42 +0000 Subject: 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. --- string/strcat.c | 21 +-------------------- 1 file changed, 1 insertion(+), 20 deletions(-) (limited to 'string') 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) -- cgit v1.1