[PATCH][AArch64] Add optimized memchr

[Ondřej Bílka]

On Fri, Sep 25, 2015 at 02:21:13PM +0100, Wilco Dijkstra wrote:
> An optimized memchr was missing for AArch64. This version is similar to strchr and is significantly
> faster than the C version. Passes GLIBC tests.
> 
> OK for commit?
> 
> ChangeLog:
> 2015-09-25  Wilco Dijkstra  <wdijkstr@arm.com>
> 2015-09-25  Kevin Petit  <kevin.petit@arm.com>
> 
> 	* sysdeps/aarch64/memchr.S (__memchr): New file.

How you tested performance. I think that also here loading first 32
bytes unaligned should be better. Could you use dryrun to verify?

Also same optimization could be used for memrchr.