[FFmpeg-devel] [RFC] clobbers for XMM registers

[Ramiro Polla]

On Tue, Sep 28, 2010 at 11:34 AM, Michael Niedermayer <michaelni at gmx.at> wrote:
> On Tue, Sep 28, 2010 at 10:32:41AM -0400, Ronald S. Bultje wrote:
>> On Tue, Sep 28, 2010 at 10:19 AM, Michael Niedermayer <michaelni at gmx.at> wrote:
>> > On Tue, Sep 28, 2010 at 10:15:29AM -0400, Ronald S. Bultje wrote:
>> >> On Tue, Sep 28, 2010 at 10:09 AM, Michael Niedermayer <michaelni at gmx.at> wrote:
>> >> > On Tue, Sep 28, 2010 at 09:36:40AM -0400, Ronald S. Bultje wrote:
>> >> >> On Tue, Sep 28, 2010 at 8:34 AM, Michael Niedermayer <michaelni at gmx.at> wrote:
>> >> >> > you want to execute code from vp3dsp_sse2.c on a pre SSE cpu?
>> >> >>
>> >> >> All _sse2 files are templates files that are included in dsputil_mmx.c
>> >> >> or similar.
>> >> >
>> >> > we could add the flags to dsputil_mmx then or split the file.
>> >>
>> >> Before splitting, can someone first confirm that -msse actually fixes it?
>> >
>> > i cant confirm that it fixes it as i dont have an affected platform but
>> > it definitly fails here with an identical looking error if i pass -mno-sse
>>
>> I would feel safer if someone on BSD/Win of one of the affected FATE
>> platforms could confirm that this fixes the issue.
>
> of course

$ cat clobber.c
void foo(void)
{
    asm("nop\n\t"::: "xmm0");
}
$ i686-mingw32-gcc-4.4 -o /dev/null -c clobber.c
clobber.c: In function 'foo':
clobber.c:3: error: unknown register name 'xmm0' in 'asm'
$ i686-mingw32-gcc-4.4 -o /dev/null -c clobber.c -msse
$