RE: [PATCH] Improve performance of strcpy

["Wilco Dijkstra" <wdijkstr at arm dot com>]

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> -----Original Message-----
> From: Wilco Dijkstra [mailto:wdijkstr@arm.com]
> Sent: 23 September 2014 18:55
> To: 'libc-alpha@sourceware.org'
> Subject: [PATCH] Improve performance of strcpy
> 
> Hi,
> 
> Similar to previous patches, this patch improves strcpy performance by using strlen+memcpy.
> This is significantly faster than a simple byte-loop, on bench-strcpy speedup is > 2x.
> 
> ChangeLog:
> 2014-09-23  Wilco Dijkstra  <wdijkstr@arm.com>
> 
> 	* string/strcpy.c (strcpy):
> 	Improve performance by using strlen and memcpy.
> 
> ---
>  string/strcpy.c |   13 +------------
>  1 file changed, 1 insertion(+), 12 deletions(-)
> 
> diff --git a/string/strcpy.c b/string/strcpy.c
> index caa234a..91f9cc6 100644
> --- a/string/strcpy.c
> +++ b/string/strcpy.c
> @@ -24,17 +24,6 @@
>  char *
>  strcpy (char *dest, const char *src)
>  {
> -  char c;
> -  char *s = (char *) src;
> -  const ptrdiff_t off = dest - s - 1;
> -
> -  do
> -    {
> -      c = *s++;
> -      s[off] = c;
> -    }
> -  while (c != '\0');
> -
> -  return dest;
> +  return memcpy (dest, src, strlen (src) + 1));
>  }
>  libc_hidden_builtin_def (strcpy)
> --
> 1.7.9.5