[Pixman] [PATCH] mmx: add src_8888_0565

[Matt Turner]

On Thu, Apr 19, 2012 at 5:40 PM, Matt Turner <mattst88 at gmail.com> wrote:
> Uses the pmadd technique described in
> http://software.intel.com/sites/landingpage/legacy/mmx/MMX_App_24-16_Bit_Conversion.pdf
> +static force_inline __m64
> +pack_4xpacked565 (__m64 a, __m64 b)
> +{
> +    __m64 rb0 = _mm_and_si64 (a, MC (packed_565_rb));
> +    __m64 rb1 = _mm_and_si64 (b, MC (packed_565_rb));
> +
> +    __m64 t0 = _mm_madd_pi16 (rb0, MC (565_pack_multiplier));
> +    __m64 t1 = _mm_madd_pi16 (rb1, MC (565_pack_multiplier));
> +
> +    __m64 g0 = _mm_and_si64 (a, MC (packed_565_g));
> +    __m64 g1 = _mm_and_si64 (b, MC (packed_565_g));
> +
> +    t0 = _mm_or_si64 (t0, g0);
> +    t1 = _mm_or_si64 (t1, g1);
> +
> +    t0 = shift(t0, -5);
> +    t1 = shift(t1, -5 + 16);
> +
> +    return _mm_shuffle_pi16 (_mm_or_si64 (t0, t1), _MM_SHUFFLE (3, 1, 2, 0));
> +}

I think the return statement can be simplified with a _mm_packs_pi32,
but I couldn't get it to work. If someone has a chance to take a look,
I'd be very appreciative.

Thanks,
Matt