diff options
| author | Michael Niedermayer <michaelni@gmx.at> | 2008-07-07 21:25:18 +0000 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2008-07-07 21:25:18 +0000 |
| commit | 35ee72b1d72a4c8fc0ae4e76ad00a71e831b8dbe (patch) | |
| tree | 0255103a0ced43ca8b212302f41bfb04b30f2420 | |
| parent | 560fa9bf51e20039120ffd1bfd7bcde6974264c6 (diff) | |
1 c-asm loop less and 1x unroll of float_to_int16_sse()
25% faster
Originally committed as revision 14104 to svn://svn.ffmpeg.org/ffmpeg/trunk
| -rw-r--r-- | libavcodec/i386/dsputil_mmx.c | 31 |
1 files changed, 19 insertions, 12 deletions
diff --git a/libavcodec/i386/dsputil_mmx.c b/libavcodec/i386/dsputil_mmx.c index cef9a106a1..5d5c1b3f7a 100644 --- a/libavcodec/i386/dsputil_mmx.c +++ b/libavcodec/i386/dsputil_mmx.c @@ -2045,18 +2045,25 @@ static void float_to_int16_3dnow(int16_t *dst, const float *src, long len){ ); } static void float_to_int16_sse(int16_t *dst, const float *src, long len){ - int i; - for(i=0; i<len; i+=4) { - asm volatile( - "cvtps2pi %1, %%mm0 \n\t" - "cvtps2pi %2, %%mm1 \n\t" - "packssdw %%mm1, %%mm0 \n\t" - "movq %%mm0, %0 \n\t" - :"=m"(dst[i]) - :"m"(src[i]), "m"(src[i+2]) - ); - } - asm volatile("emms"); + asm volatile( + "add %0 , %0 \n\t" + "lea (%2,%0,2) , %2 \n\t" + "add %0 , %1 \n\t" + "neg %0 \n\t" + "1: \n\t" + "cvtps2pi (%2,%0,2) , %%mm0 \n\t" + "cvtps2pi 8(%2,%0,2) , %%mm1 \n\t" + "cvtps2pi 16(%2,%0,2) , %%mm2 \n\t" + "cvtps2pi 24(%2,%0,2) , %%mm3 \n\t" + "packssdw %%mm1 , %%mm0 \n\t" + "packssdw %%mm3 , %%mm2 \n\t" + "movq %%mm0 , (%1,%0) \n\t" + "movq %%mm2 , 8(%1,%0) \n\t" + "add $16 , %0 \n\t" + " js 1b \n\t" + "emms \n\t" + :"+r"(len), "+r"(dst), "+r"(src) + ); } extern void ff_snow_horizontal_compose97i_sse2(IDWTELEM *b, int width); |