[PATCH] Improve performance of strcat

[Adhemerval Zanella]

On 07-08-2014 10:27, Wilco Dijkstra wrote:
> Hi,
>
> 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.
>
> OK for commit?
>
> ChangeLog:
> 2014-08-07  Wilco Dijkstra <wdijkstr@arm.com>
>
> 	* string/strcat.c (strcat): Improve performance by using strlen/strcpy.
> ---
>  string/strcat.c |   21 +--------------------
>  1 file changed, 1 insertion(+), 20 deletions(-)
>
> diff --git a/string/strcat.c b/string/strcat.c
>
> -  do
> -    {
> -      c = *s2++;
> -      *++s1 = c;
> -    }
> -  while (c != '\0');
> -
> +  strcpy (dest + strlen (dest), src);

Should it be __strcpy/__strlen ?