[FFmpeg-devel] [PATCH] Dsputilize some functions from APE decode 2/2 - SSE2

[Michael Niedermayer]

On Thu, Jul 10, 2008 at 01:48:46PM +0300, Kostya wrote:
> On Thu, Jul 10, 2008 at 11:48:14AM +0200, Michael Niedermayer wrote:
> > On Thu, Jul 10, 2008 at 11:16:01AM +0300, Kostya wrote:
> > [...]
> > > +static void add_int16_sse2(int16_t * v1, int16_t * v2, int order)
> > > +{
> > > +    x86_reg o = -(order << 1);
> > > +    v1 += order;
> > > +    v2 += order;
> > > +    asm volatile(
> > > +        "1:                       \n\t"
> > 
> > > +        "movdqu  (%1,%2), %%xmm0  \n\t"
> > > +        "paddw   (%0,%2), %%xmm0  \n\t"
> > > +        "movdqa  %%xmm0,  (%0,%2) \n\t"
> > > +        "add     $16,     %2      \n\t"
> > > +        "movdqu  (%1,%2), %%xmm0  \n\t"
> > > +        "paddw   (%0,%2), %%xmm0  \n\t"
> > > +        "movdqa  %%xmm0,  (%0,%2) \n\t"
> > > +        "add     $16,     %2      \n\t"
> > 
> > is that faster than:
> > "movdqu    (%1,%2), %%xmm0  \n\t"
> > "paddw     (%0,%2), %%xmm0  \n\t"
> > "movdqa  %%xmm0,    (%0,%2) \n\t"
> > "movdqu  16(%1,%2), %%xmm0  \n\t"
> > "paddw   16(%0,%2), %%xmm0  \n\t"
> > "movdqa  %%xmm0,  16(%0,%2) \n\t"
> > "add     $32,     %2      \n\t"
> > 
> > ?
>  
> It was the first thing I've tried. It was slower (on Core2).

and:

"movdqu    (%1,%2), %%xmm0  \n\t"
"movdqu  16(%1,%2), %%xmm1  \n\t"
"paddw     (%0,%2), %%xmm0  \n\t"
"paddw   16(%0,%2), %%xmm1  \n\t"
"movdqa  %%xmm0,    (%0,%2) \n\t"
"movdqa  %%xmm1,  16(%0,%2) \n\t"
"add     $32,     %2      \n\t"

?

[...] 

-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Those who are too smart to engage in politics are punished by being
governed by those who are dumber. -- Plato 
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