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

[Michael Niedermayer]

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"

?


[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

I have often repented speaking, but never of holding my tongue.
-- Xenocrates
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