diff options
Diffstat (limited to 'liba52')
| -rw-r--r-- | liba52/downmix.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/liba52/downmix.c b/liba52/downmix.c index e2bcd87781..e1f70104e6 100644 --- a/liba52/downmix.c +++ b/liba52/downmix.c @@ -19,6 +19,8 @@ * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * SSE optimizations from Michael Niedermayer (michaelni@gmx.at) */ #include "config.h" @@ -445,12 +447,37 @@ static void mix32toS (sample_t * samples, sample_t bias) int i; sample_t common, surround; +#ifdef HAVE_SSE + asm volatile( + "movlps %1, %%xmm7 \n\t" + "shufps $0x00, %%xmm7, %%xmm7 \n\t" + "movl $-1024, %%esi \n\t" + "1: \n\t" + "movaps 1024(%0, %%esi), %%xmm0 \n\t" + "movaps 3072(%0, %%esi), %%xmm2 \n\t" + "addps %%xmm7, %%xmm0 \n\t" // common + "addps 4096(%0, %%esi), %%xmm2 \n\t" // surround + "movaps (%0, %%esi), %%xmm1 \n\t" + "movaps 2048(%0, %%esi), %%xmm3 \n\t" + "subps %%xmm2, %%xmm1 \n\t" + "addps %%xmm2, %%xmm3 \n\t" + "addps %%xmm0, %%xmm1 \n\t" + "addps %%xmm0, %%xmm3 \n\t" + "movaps %%xmm1, (%0, %%esi) \n\t" + "movaps %%xmm3, 1024(%0, %%esi) \n\t" + "addl $16, %%esi \n\t" + " jnz 1b \n\t" + :: "r" (samples+256), "m" (bias) + : "%esi" + ); +#else for (i = 0; i < 256; i++) { common = samples[i + 256] + bias; surround = samples[i + 768] + samples[i + 1024]; samples[i] += common - surround; samples[i + 256] = samples[i + 512] + common + surround; } +#endif } static void move2to1 (sample_t * src, sample_t * dest, sample_t bias) |