[FFmpeg-devel] Fix VP3 IDCT on Win64

[Ronald S. Bultje]

Hi,

On Wed, Aug 25, 2010 at 3:59 PM, Reimar D?ffinger
<Reimar.Doeffinger at gmx.de> wrote:
> On Wed, Aug 25, 2010 at 07:46:35PM +0100, M?ns Rullg?rd wrote:
>> "Ronald S. Bultje" <rsbultje at gmail.com> writes:
>> > After this patch, it's still broken, because of put_h264_chroma_mc8
>> > ssse3 not properly marking clobbers, but this patch 1/3rd-fixes
>> > VP6/Win64/FATE failures (similar to how my previous patch fixed a
>> > third of it).
>> >
>> > I can't fix put_h264_chroma_mc8_ssse3 because it's split over multiple
>> > asm() statements which rely on maintaining register values between, so
>> > I will likely rewrite that (also for VC-1/H.264/RV40) in yasm, but
>> > that'll take a little longer... After that, fate-ea-vp60 passes
>> > (haven't tested the others yet, because Win64 hates me).
>> >
>> > Ronald
>> >
>> > Index: libavcodec/x86/vp3dsp_sse2.c
>> > ===================================================================
>> > --- libavcodec/x86/vp3dsp_sse2.c ? ?(revision 24909)
>> > +++ libavcodec/x86/vp3dsp_sse2.c ? ?(working copy)
>> > @@ -171,6 +171,7 @@
>> > ? ? ? ? ?VP3_1D_IDCT_SSE2(ADD8, SHIFT4)
>> > ? ? ? ? ?PUT_BLOCK(%%xmm0, %%xmm1, %%xmm2, %%xmm3, %%xmm4, %%xmm5, %%xmm6, %%xmm7)
>> > ? ? ? ? ?:: "r"(input_data), "r"(ff_vp3_idct_data), "m"(ff_pw_8)
>> > + ? ? ? ?: "%xmm6", "%xmm7"
>> > ? ? ?);
>> > ?}
>>
>> Looks good to my untrained eye.
>
> Assuming it works with all compilers, which would simplify the patch I proposed some
> time ago (though listing all XMM registers 0-7 IMO would be better).

Would indeed be better. I still think we'll eventually move all this
code over to yasm...

Ronald