diff options
| author | Michael Niedermayer <michaelni@gmx.at> | 2008-07-07 20:46:03 +0000 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2008-07-07 20:46:03 +0000 |
| commit | 63b737d4f9c118853a4f8d9af641335629bdf3ab (patch) | |
| tree | ec81c3a61b21115454d8d4fb7051c7079209c526 | |
| parent | 00496302d67141e4b4ff2349eeaf7e40b05c13a4 (diff) | |
dont use C-asm loops and unroll once float_to_int16_3dnow()
30% faster
Originally committed as revision 14102 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 60511a3bab..8925ffaf43 100644 --- a/libavcodec/i386/dsputil_mmx.c +++ b/libavcodec/i386/dsputil_mmx.c @@ -2024,18 +2024,25 @@ static void vector_fmul_add_add_sse(float *dst, const float *src0, const float * static void float_to_int16_3dnow(int16_t *dst, const float *src, int len){ // not bit-exact: pf2id uses different rounding than C and SSE - int i; - for(i=0; i<len; i+=4) { - asm volatile( - "pf2id %1, %%mm0 \n\t" - "pf2id %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("femms"); + 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" + "pf2id (%2,%0,2) , %%mm0 \n\t" + "pf2id 8(%2,%0,2) , %%mm1 \n\t" + "pf2id 16(%2,%0,2) , %%mm2 \n\t" + "pf2id 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" + "femms \n\t" + :"+r"(len), "+r"(dst), "+r"(src) + ); } static void float_to_int16_sse(int16_t *dst, const float *src, int len){ int i; |