[FFmpeg-devel] [PATCH] MMX2/SSSE3 VC1 loop filter
Ronald S. Bultje
Tue Jul 6 17:16:53 CEST 2010
On Tue, Jul 6, 2010 at 11:15 AM, Loren Merritt <lorenm at u.washington.edu> wrote:
> On Tue, 6 Jul 2010, Ronald S. Bultje wrote:
>> On Jul 5, 2010, at 11:34 PM, David Conrad <lessen42 at gmail.com> wrote:
>>> On Jul 5, 2010, at 4:30 PM, Ronald S. Bultje wrote:
>>>>> +cglobal vc1_h_loop_filter8_sse4, 3,5,8
>>>> Should this (and others like it) be under #ifdef X86_64? I got compile
>>>> errors if I tried to use xmm8-15 on x86_32.
>>> What compiler errors are you getting? This shouldn't use xmm8+ ever.
>> The ,8 at the end saves xmm8-15. Xmm0-7 are free to use. You can probably
>> remove it unless I'm wrong (very well possible).
> The ,8 says that it uses 8 xmmregs, namely xmm0-xmm7. Which does nothing at
> all on x86_32, since all xmms are caller-saved under x86_32 abi, but is
> needed for win64.
Oh! So I should do this even if it's <=8?
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