diff options
Diffstat (limited to 'distrib/sdl-1.2.15/src/audio/SDL_mixer_MMX.c')
| -rw-r--r-- | distrib/sdl-1.2.15/src/audio/SDL_mixer_MMX.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/distrib/sdl-1.2.15/src/audio/SDL_mixer_MMX.c b/distrib/sdl-1.2.15/src/audio/SDL_mixer_MMX.c new file mode 100644 index 0000000..a2f1d8d --- /dev/null +++ b/distrib/sdl-1.2.15/src/audio/SDL_mixer_MMX.c @@ -0,0 +1,207 @@ +/* + SDL - Simple DirectMedia Layer + Copyright (C) 1997-2012 Sam Lantinga + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + This library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + + Sam Lantinga + slouken@libsdl.org +*/ +#include "SDL_config.h" + +/* + MMX assembler version of SDL_MixAudio for signed little endian 16 bit samples and signed 8 bit samples + Copyright 2002 Stephane Marchesin (stephane.marchesin@wanadoo.fr) + This code is licensed under the LGPL (see COPYING for details) + + Assumes buffer size in bytes is a multiple of 16 + Assumes SDL_MIX_MAXVOLUME = 128 +*/ + + +/*********************************************** +* Mixing for 16 bit signed buffers +***********************************************/ + +#if defined(SDL_BUGGY_MMX_MIXERS) /* buggy, so we're disabling them. --ryan. */ +#if defined(__GNUC__) && defined(__i386__) && defined(SDL_ASSEMBLY_ROUTINES) +void SDL_MixAudio_MMX_S16(char* dst,char* src,unsigned int size,int volume) +{ + __asm__ __volatile__ ( + +" movl %3,%%eax\n" /* eax = volume */ + +" movl %2,%%edx\n" /* edx = size */ + +" shrl $4,%%edx\n" /* process 16 bytes per iteration = 8 samples */ + +" jz .endS16\n" + +" pxor %%mm0,%%mm0\n" + +" movd %%eax,%%mm0\n" +" movq %%mm0,%%mm1\n" +" psllq $16,%%mm0\n" +" por %%mm1,%%mm0\n" +" psllq $16,%%mm0\n" +" por %%mm1,%%mm0\n" +" psllq $16,%%mm0\n" +" por %%mm1,%%mm0\n" /* mm0 = vol|vol|vol|vol */ + +".align 8\n" +" .mixloopS16:\n" + +" movq (%1),%%mm1\n" /* mm1 = a|b|c|d */ + +" movq %%mm1,%%mm2\n" /* mm2 = a|b|c|d */ + +" movq 8(%1),%%mm4\n" /* mm4 = e|f|g|h */ + + /* pré charger le buffer dst dans mm7 */ +" movq (%0),%%mm7\n" /* mm7 = dst[0] */ + + /* multiplier par le volume */ +" pmullw %%mm0,%%mm1\n" /* mm1 = l(a*v)|l(b*v)|l(c*v)|l(d*v) */ + +" pmulhw %%mm0,%%mm2\n" /* mm2 = h(a*v)|h(b*v)|h(c*v)|h(d*v) */ +" movq %%mm4,%%mm5\n" /* mm5 = e|f|g|h */ + +" pmullw %%mm0,%%mm4\n" /* mm4 = l(e*v)|l(f*v)|l(g*v)|l(h*v) */ + +" pmulhw %%mm0,%%mm5\n" /* mm5 = h(e*v)|h(f*v)|h(g*v)|h(h*v) */ +" movq %%mm1,%%mm3\n" /* mm3 = l(a*v)|l(b*v)|l(c*v)|l(d*v) */ + +" punpckhwd %%mm2,%%mm1\n" /* mm1 = a*v|b*v */ + +" movq %%mm4,%%mm6\n" /* mm6 = l(e*v)|l(f*v)|l(g*v)|l(h*v) */ +" punpcklwd %%mm2,%%mm3\n" /* mm3 = c*v|d*v */ + +" punpckhwd %%mm5,%%mm4\n" /* mm4 = e*f|f*v */ + +" punpcklwd %%mm5,%%mm6\n" /* mm6 = g*v|h*v */ + + /* pré charger le buffer dst dans mm5 */ +" movq 8(%0),%%mm5\n" /* mm5 = dst[1] */ + + /* diviser par 128 */ +" psrad $7,%%mm1\n" /* mm1 = a*v/128|b*v/128 , 128 = SDL_MIX_MAXVOLUME */ +" add $16,%1\n" + +" psrad $7,%%mm3\n" /* mm3 = c*v/128|d*v/128 */ + +" psrad $7,%%mm4\n" /* mm4 = e*v/128|f*v/128 */ + + /* mm1 = le sample avec le volume modifié */ +" packssdw %%mm1,%%mm3\n" /* mm3 = s(a*v|b*v|c*v|d*v) */ + +" psrad $7,%%mm6\n" /* mm6= g*v/128|h*v/128 */ +" paddsw %%mm7,%%mm3\n" /* mm3 = adjust_volume(src)+dst */ + + /* mm4 = le sample avec le volume modifié */ +" packssdw %%mm4,%%mm6\n" /* mm6 = s(e*v|f*v|g*v|h*v) */ +" movq %%mm3,(%0)\n" + +" paddsw %%mm5,%%mm6\n" /* mm6 = adjust_volume(src)+dst */ + +" movq %%mm6,8(%0)\n" + +" add $16,%0\n" + +" dec %%edx\n" + +" jnz .mixloopS16\n" + +" emms\n" + +".endS16:\n" + : + : "r" (dst), "r"(src),"m"(size), + "m"(volume) + : "eax","edx","memory" + ); +} + + + +/*////////////////////////////////////////////// */ +/* Mixing for 8 bit signed buffers */ +/*////////////////////////////////////////////// */ + +void SDL_MixAudio_MMX_S8(char* dst,char* src,unsigned int size,int volume) +{ + __asm__ __volatile__ ( + +" movl %3,%%eax\n" /* eax = volume */ + +" movd %%eax,%%mm0\n" +" movq %%mm0,%%mm1\n" +" psllq $16,%%mm0\n" +" por %%mm1,%%mm0\n" +" psllq $16,%%mm0\n" +" por %%mm1,%%mm0\n" +" psllq $16,%%mm0\n" +" por %%mm1,%%mm0\n" + +" movl %2,%%edx\n" /* edx = size */ +" shr $3,%%edx\n" /* process 8 bytes per iteration = 8 samples */ + +" cmp $0,%%edx\n" +" je .endS8\n" + +".align 8\n" +" .mixloopS8:\n" + +" pxor %%mm2,%%mm2\n" /* mm2 = 0 */ +" movq (%1),%%mm1\n" /* mm1 = a|b|c|d|e|f|g|h */ + +" movq %%mm1,%%mm3\n" /* mm3 = a|b|c|d|e|f|g|h */ + + /* on va faire le "sign extension" en faisant un cmp avec 0 qui retourne 1 si <0, 0 si >0 */ +" pcmpgtb %%mm1,%%mm2\n" /* mm2 = 11111111|00000000|00000000.... */ + +" punpckhbw %%mm2,%%mm1\n" /* mm1 = 0|a|0|b|0|c|0|d */ + +" punpcklbw %%mm2,%%mm3\n" /* mm3 = 0|e|0|f|0|g|0|h */ +" movq (%0),%%mm2\n" /* mm2 = destination */ + +" pmullw %%mm0,%%mm1\n" /* mm1 = v*a|v*b|v*c|v*d */ +" add $8,%1\n" + +" pmullw %%mm0,%%mm3\n" /* mm3 = v*e|v*f|v*g|v*h */ +" psraw $7,%%mm1\n" /* mm1 = v*a/128|v*b/128|v*c/128|v*d/128 */ + +" psraw $7,%%mm3\n" /* mm3 = v*e/128|v*f/128|v*g/128|v*h/128 */ + +" packsswb %%mm1,%%mm3\n" /* mm1 = v*a/128|v*b/128|v*c/128|v*d/128|v*e/128|v*f/128|v*g/128|v*h/128 */ + +" paddsb %%mm2,%%mm3\n" /* add to destination buffer */ + +" movq %%mm3,(%0)\n" /* store back to ram */ +" add $8,%0\n" + +" dec %%edx\n" + +" jnz .mixloopS8\n" + +".endS8:\n" +" emms\n" + : + : "r" (dst), "r"(src),"m"(size), + "m"(volume) + : "eax","edx","memory" + ); +} +#endif +#endif |