| /* |
| 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 |
