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Re: [PATCH][AArch64] Add optimized memchr
- From: OndÅej BÃlka <neleai at seznam dot cz>
- To: Wilco Dijkstra <wdijkstr at arm dot com>
- Cc: 'GNU C Library' <libc-alpha at sourceware dot org>
- Date: Sat, 26 Sep 2015 10:45:44 +0200
- Subject: Re: [PATCH][AArch64] Add optimized memchr
- Authentication-results: sourceware.org; auth=none
- References: <002d01d0f795$0ce77eb0$26b67c10$ at com>
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.