1/* 2 SDL - Simple DirectMedia Layer 3 Copyright (C) 1997-2012 Sam Lantinga 4 5 This library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 This library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with this library; if not, write to the Free Software 17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 18 19 Sam Lantinga 20 slouken@libsdl.org 21*/ 22#include "SDL_config.h" 23 24/* 25 MMX assembler version of SDL_MixAudio for signed little endian 16 bit samples and signed 8 bit samples 26 Copyright 2002 Stephane Marchesin (stephane.marchesin@wanadoo.fr) 27 This code is licensed under the LGPL (see COPYING for details) 28 29 Assumes buffer size in bytes is a multiple of 16 30 Assumes SDL_MIX_MAXVOLUME = 128 31*/ 32 33 34/*********************************************** 35* Mixing for 16 bit signed buffers 36***********************************************/ 37 38#if defined(SDL_BUGGY_MMX_MIXERS) /* buggy, so we're disabling them. --ryan. */ 39#if defined(__GNUC__) && defined(__i386__) && defined(SDL_ASSEMBLY_ROUTINES) 40void SDL_MixAudio_MMX_S16(char* dst,char* src,unsigned int size,int volume) 41{ 42 __asm__ __volatile__ ( 43 44" movl %3,%%eax\n" /* eax = volume */ 45 46" movl %2,%%edx\n" /* edx = size */ 47 48" shrl $4,%%edx\n" /* process 16 bytes per iteration = 8 samples */ 49 50" jz .endS16\n" 51 52" pxor %%mm0,%%mm0\n" 53 54" movd %%eax,%%mm0\n" 55" movq %%mm0,%%mm1\n" 56" psllq $16,%%mm0\n" 57" por %%mm1,%%mm0\n" 58" psllq $16,%%mm0\n" 59" por %%mm1,%%mm0\n" 60" psllq $16,%%mm0\n" 61" por %%mm1,%%mm0\n" /* mm0 = vol|vol|vol|vol */ 62 63".align 8\n" 64" .mixloopS16:\n" 65 66" movq (%1),%%mm1\n" /* mm1 = a|b|c|d */ 67 68" movq %%mm1,%%mm2\n" /* mm2 = a|b|c|d */ 69 70" movq 8(%1),%%mm4\n" /* mm4 = e|f|g|h */ 71 72 /* pr� charger le buffer dst dans mm7 */ 73" movq (%0),%%mm7\n" /* mm7 = dst[0] */ 74 75 /* multiplier par le volume */ 76" pmullw %%mm0,%%mm1\n" /* mm1 = l(a*v)|l(b*v)|l(c*v)|l(d*v) */ 77 78" pmulhw %%mm0,%%mm2\n" /* mm2 = h(a*v)|h(b*v)|h(c*v)|h(d*v) */ 79" movq %%mm4,%%mm5\n" /* mm5 = e|f|g|h */ 80 81" pmullw %%mm0,%%mm4\n" /* mm4 = l(e*v)|l(f*v)|l(g*v)|l(h*v) */ 82 83" pmulhw %%mm0,%%mm5\n" /* mm5 = h(e*v)|h(f*v)|h(g*v)|h(h*v) */ 84" movq %%mm1,%%mm3\n" /* mm3 = l(a*v)|l(b*v)|l(c*v)|l(d*v) */ 85 86" punpckhwd %%mm2,%%mm1\n" /* mm1 = a*v|b*v */ 87 88" movq %%mm4,%%mm6\n" /* mm6 = l(e*v)|l(f*v)|l(g*v)|l(h*v) */ 89" punpcklwd %%mm2,%%mm3\n" /* mm3 = c*v|d*v */ 90 91" punpckhwd %%mm5,%%mm4\n" /* mm4 = e*f|f*v */ 92 93" punpcklwd %%mm5,%%mm6\n" /* mm6 = g*v|h*v */ 94 95 /* pr� charger le buffer dst dans mm5 */ 96" movq 8(%0),%%mm5\n" /* mm5 = dst[1] */ 97 98 /* diviser par 128 */ 99" psrad $7,%%mm1\n" /* mm1 = a*v/128|b*v/128 , 128 = SDL_MIX_MAXVOLUME */ 100" add $16,%1\n" 101 102" psrad $7,%%mm3\n" /* mm3 = c*v/128|d*v/128 */ 103 104" psrad $7,%%mm4\n" /* mm4 = e*v/128|f*v/128 */ 105 106 /* mm1 = le sample avec le volume modifi� */ 107" packssdw %%mm1,%%mm3\n" /* mm3 = s(a*v|b*v|c*v|d*v) */ 108 109" psrad $7,%%mm6\n" /* mm6= g*v/128|h*v/128 */ 110" paddsw %%mm7,%%mm3\n" /* mm3 = adjust_volume(src)+dst */ 111 112 /* mm4 = le sample avec le volume modifi� */ 113" packssdw %%mm4,%%mm6\n" /* mm6 = s(e*v|f*v|g*v|h*v) */ 114" movq %%mm3,(%0)\n" 115 116" paddsw %%mm5,%%mm6\n" /* mm6 = adjust_volume(src)+dst */ 117 118" movq %%mm6,8(%0)\n" 119 120" add $16,%0\n" 121 122" dec %%edx\n" 123 124" jnz .mixloopS16\n" 125 126" emms\n" 127 128".endS16:\n" 129 : 130 : "r" (dst), "r"(src),"m"(size), 131 "m"(volume) 132 : "eax","edx","memory" 133 ); 134} 135 136 137 138/*////////////////////////////////////////////// */ 139/* Mixing for 8 bit signed buffers */ 140/*////////////////////////////////////////////// */ 141 142void SDL_MixAudio_MMX_S8(char* dst,char* src,unsigned int size,int volume) 143{ 144 __asm__ __volatile__ ( 145 146" movl %3,%%eax\n" /* eax = volume */ 147 148" movd %%eax,%%mm0\n" 149" movq %%mm0,%%mm1\n" 150" psllq $16,%%mm0\n" 151" por %%mm1,%%mm0\n" 152" psllq $16,%%mm0\n" 153" por %%mm1,%%mm0\n" 154" psllq $16,%%mm0\n" 155" por %%mm1,%%mm0\n" 156 157" movl %2,%%edx\n" /* edx = size */ 158" shr $3,%%edx\n" /* process 8 bytes per iteration = 8 samples */ 159 160" cmp $0,%%edx\n" 161" je .endS8\n" 162 163".align 8\n" 164" .mixloopS8:\n" 165 166" pxor %%mm2,%%mm2\n" /* mm2 = 0 */ 167" movq (%1),%%mm1\n" /* mm1 = a|b|c|d|e|f|g|h */ 168 169" movq %%mm1,%%mm3\n" /* mm3 = a|b|c|d|e|f|g|h */ 170 171 /* on va faire le "sign extension" en faisant un cmp avec 0 qui retourne 1 si <0, 0 si >0 */ 172" pcmpgtb %%mm1,%%mm2\n" /* mm2 = 11111111|00000000|00000000.... */ 173 174" punpckhbw %%mm2,%%mm1\n" /* mm1 = 0|a|0|b|0|c|0|d */ 175 176" punpcklbw %%mm2,%%mm3\n" /* mm3 = 0|e|0|f|0|g|0|h */ 177" movq (%0),%%mm2\n" /* mm2 = destination */ 178 179" pmullw %%mm0,%%mm1\n" /* mm1 = v*a|v*b|v*c|v*d */ 180" add $8,%1\n" 181 182" pmullw %%mm0,%%mm3\n" /* mm3 = v*e|v*f|v*g|v*h */ 183" psraw $7,%%mm1\n" /* mm1 = v*a/128|v*b/128|v*c/128|v*d/128 */ 184 185" psraw $7,%%mm3\n" /* mm3 = v*e/128|v*f/128|v*g/128|v*h/128 */ 186 187" 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 */ 188 189" paddsb %%mm2,%%mm3\n" /* add to destination buffer */ 190 191" movq %%mm3,(%0)\n" /* store back to ram */ 192" add $8,%0\n" 193 194" dec %%edx\n" 195 196" jnz .mixloopS8\n" 197 198".endS8:\n" 199" emms\n" 200 : 201 : "r" (dst), "r"(src),"m"(size), 202 "m"(volume) 203 : "eax","edx","memory" 204 ); 205} 206#endif 207#endif 208