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Re: [RFC PATCH] aarch64: improve memset

On 11/05/2014 03:35 PM, Will Newton wrote:
> On 30 September 2014 12:03, Marcus Shawcroft <> wrote:
>> On 14 June 2014 08:06, Richard Henderson <> wrote:
>>> The major idea here is to use IFUNC to check the zva line size once, and use
>>> that to select different entry points.  This saves 3 branches during startup,
>>> and allows significantly more flexibility.
>>> Also, I've cribbed several of the unaligned store ideas that Ondrej has done
>>> with the x86 versions.
>>> I've done some performance testing using cachebench, which suggests that the
>>> unrolled memset_zva_64 path is 1.5x faster than the current memset at 1024
>>> bytes and above.  The non-zva path appears to be largely unchanged.
>> OK Thanks /Marcus
> It looks like this patch has slipped through the cracks. Richard, are
> you happy to apply this or do you think it warrants further
> discussion?

Sorry for the radio silence.

Just before I went to apply it I thought I spotted a bug that would affect  I haven't had time to make sure one way or another.


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