[FFmpeg-devel] [PATCH] move h264 loopfilter strength code to yasm

[Måns Rullgård]

Reimar D?ffinger <Reimar.Doeffinger at gmx.de> writes:

> On Fri, Sep 24, 2010 at 05:30:30PM +0100, M?ns Rullg?rd wrote:
>> Reimar D?ffinger <Reimar.Doeffinger at gmx.de> writes:
>> 
>> > On Fri, Sep 24, 2010 at 07:17:06AM -0400, Ronald S. Bultje wrote:
>> >> On Thu, Sep 23, 2010 at 11:18 PM, Michael Niedermayer <michaelni at gmx.at> wrote:
>> >> > On Thu, Sep 23, 2010 at 06:13:30PM -0400, Ronald S. Bultje wrote:
>> >> >> $subj. This could likely be done in inline asm as well but I still
>> >> >> can't write that.
>> >> >
>> >> > can i help you to learn it?
>> >> 
>> >> Yes.
>> >> 
>> >> - we need a way to clobber xmm registers. This turns out to be very
>> >> difficult and I haven't really looked at it very seriously. Help get
>> >> something like Reimar's patch committed without breaking any of the
>> >> fate systems. You still are maintainer and there is a patch, there's
>> >> no reason why this can't be finished.
>> >
>> > The main part that is lacking is a configure test.
>> 
>> If this (whatever "this" is) introduces a compiler dependency, we're
>> better off moving it to yasm.
>
> Well, I don't see how we could use XMM clobbers on a compiler that does
> not know anything about XMM registers.

I would not be surprised if some compiler uses the registers without
recognising them in clobber lists.

-- 
M?ns Rullg?rd
mans at mansr.com