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annotate src/audio/SDL_mixer_MMX.c @ 1199:2d6dc7de1145

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From: Mike Frysinger <vapier@gentoo.org> To: sdl@libsdl.org Date: Sun, 11 Dec 2005 22:57:37 -0500 Subject: [SDL] exec stack in libsdl update i posted back in September a patch to remove executable stacks: http://www.devolution.com/pipermail/sdl/2005-September/070626.html later in November, a similar patch was merged it seems: http://www.libsdl.org/cgi/cvsweb.cgi/SDL12/src/hermes/mmx_main.asm however, this lacks the additional output format checks that i posted in my patch ... this isnt a problem if the hermes asm code is only ever used to produce ELF objects, but if this is not true, then the additional checks in my original patch will need to be merged -mike
author Ryan C. Gordon <icculus@icculus.org>
date Mon, 12 Dec 2005 09:13:12 +0000
parents b580f7201543
children d910939febfa
rev   line source
1019
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1 /*
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2 MMX assembler version of SDL_MixAudio for signed little endian 16 bit samples and signed 8 bit samples
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3 Copyright 2002 Stephane Marchesin (stephane.marchesin@wanadoo.fr)
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4 This code is licensed under the LGPL (see COPYING for details)
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5
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6 Assumes buffer size in bytes is a multiple of 16
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7 Assumes SDL_MIX_MAXVOLUME = 128
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8 */
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9
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11 /***********************************************
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12 * Mixing for 16 bit signed buffers
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13 ***********************************************/
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14
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15 #if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT)
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16 void SDL_MixAudio_MMX_S16(char* dst,char* src,unsigned int size,int volume)
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17 {
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18 __asm__ __volatile__ (
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19
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20 " movl %3,%%eax\n" // eax = volume
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21
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22 " movl %2,%%edx\n" // edx = size
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23
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24 " shrl $4,%%edx\n" // process 16 bytes per iteration = 8 samples
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25
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26 " jz .endS16\n"
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27
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28 " pxor %%mm0,%%mm0\n"
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29
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30 " movd %%eax,%%mm0\n"
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31 " movq %%mm0,%%mm1\n"
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32 " psllq $16,%%mm0\n"
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33 " por %%mm1,%%mm0\n"
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34 " psllq $16,%%mm0\n"
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35 " por %%mm1,%%mm0\n"
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36 " psllq $16,%%mm0\n"
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37 " por %%mm1,%%mm0\n" // mm0 = vol|vol|vol|vol
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38
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39 ".align 16\n"
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40 " .mixloopS16:\n"
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41
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42 " movq (%1),%%mm1\n" // mm1 = a|b|c|d
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43
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44 " movq %%mm1,%%mm2\n" // mm2 = a|b|c|d
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45
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46 " movq 8(%1),%%mm4\n" // mm4 = e|f|g|h
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47
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48 // pré charger le buffer dst dans mm7
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49 " movq (%0),%%mm7\n" // mm7 = dst[0]"
539
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50
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51 // multiplier par le volume
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52 " pmullw %%mm0,%%mm1\n" // mm1 = l(a*v)|l(b*v)|l(c*v)|l(d*v)
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53
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54 " pmulhw %%mm0,%%mm2\n" // mm2 = h(a*v)|h(b*v)|h(c*v)|h(d*v)
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55 " movq %%mm4,%%mm5\n" // mm5 = e|f|g|h
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56
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57 " pmullw %%mm0,%%mm4\n" // mm4 = l(e*v)|l(f*v)|l(g*v)|l(h*v)
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58
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59 " pmulhw %%mm0,%%mm5\n" // mm5 = h(e*v)|h(f*v)|h(g*v)|h(h*v)
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60 " movq %%mm1,%%mm3\n" // mm3 = l(a*v)|l(b*v)|l(c*v)|l(d*v)
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61
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62 " punpckhwd %%mm2,%%mm1\n" // mm1 = a*v|b*v
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63
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64 " movq %%mm4,%%mm6\n" // mm6 = l(e*v)|l(f*v)|l(g*v)|l(h*v)
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65 " punpcklwd %%mm2,%%mm3\n" // mm3 = c*v|d*v
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66
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67 " punpckhwd %%mm5,%%mm4\n" // mm4 = e*f|f*v
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68
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69 " punpcklwd %%mm5,%%mm6\n" // mm6 = g*v|h*v
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70
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71 // pré charger le buffer dst dans mm5
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72 " movq 8(%0),%%mm5\n" // mm5 = dst[1]
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73
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74 // diviser par 128
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75 " psrad $7,%%mm1\n" // mm1 = a*v/128|b*v/128 , 128 = SDL_MIX_MAXVOLUME
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76 " add $16,%1\n"
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77
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78 " psrad $7,%%mm3\n" // mm3 = c*v/128|d*v/128
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79
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80 " psrad $7,%%mm4\n" // mm4 = e*v/128|f*v/128
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81
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82 // mm1 = le sample avec le volume modifié
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83 " packssdw %%mm1,%%mm3\n" // mm3 = s(a*v|b*v|c*v|d*v)
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84
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85 " psrad $7,%%mm6\n" // mm6= g*v/128|h*v/128
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86 " paddsw %%mm7,%%mm3\n" // mm3 = adjust_volume(src)+dst
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87
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88 // mm4 = le sample avec le volume modifié
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89 " packssdw %%mm4,%%mm6\n" // mm6 = s(e*v|f*v|g*v|h*v)
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90 " movq %%mm3,(%0)\n"
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91
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92 " paddsw %%mm5,%%mm6\n" // mm6 = adjust_volume(src)+dst
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93
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94 " movq %%mm6,8(%0)\n"
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95
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96 " add $16,%0\n"
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98 " dec %%edx\n"
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99
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100 " jnz .mixloopS16\n"
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101
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102 " emms\n"
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103
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104 ".endS16:\n"
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105 :
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106 : "r" (dst), "r"(src),"m"(size),
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107 "m"(volume)
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108 : "eax","edx","memory"
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109 );
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110 }
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111
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113
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114 ////////////////////////////////////////////////
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115 // Mixing for 8 bit signed buffers
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116 ////////////////////////////////////////////////
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117
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118 void SDL_MixAudio_MMX_S8(char* dst,char* src,unsigned int size,int volume)
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119 {
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120 __asm__ __volatile__ (
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121
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122 " movl %3,%%eax\n" // eax = volume
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123
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124 " movd %%eax,%%mm0\n"
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125 " movq %%mm0,%%mm1\n"
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126 " psllq $16,%%mm0\n"
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127 " por %%mm1,%%mm0\n"
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128 " psllq $16,%%mm0\n"
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129 " por %%mm1,%%mm0\n"
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130 " psllq $16,%%mm0\n"
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131 " por %%mm1,%%mm0\n"
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132
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133 " movl %2,%%edx\n" // edx = size
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134 " shr $3,%%edx\n" // process 8 bytes per iteration = 8 samples
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135
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136 " cmp $0,%%edx\n"
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137 " je .endS8\n"
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138
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139 ".align 16\n"
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140 " .mixloopS8:\n"
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141
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142 " pxor %%mm2,%%mm2\n" // mm2 = 0
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143 " movq (%1),%%mm1\n" // mm1 = a|b|c|d|e|f|g|h
539
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144
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145 " movq %%mm1,%%mm3\n" // mm3 = a|b|c|d|e|f|g|h
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146
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147 // on va faire le "sign extension" en faisant un cmp avec 0 qui retourne 1 si <0, 0 si >0
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148 " pcmpgtb %%mm1,%%mm2\n" // mm2 = 11111111|00000000|00000000....
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149
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150 " punpckhbw %%mm2,%%mm1\n" // mm1 = 0|a|0|b|0|c|0|d
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151
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152 " punpcklbw %%mm2,%%mm3\n" // mm3 = 0|e|0|f|0|g|0|h
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153 " movq (%0),%%mm2\n" // mm2 = destination
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154
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155 " pmullw %%mm0,%%mm1\n" // mm1 = v*a|v*b|v*c|v*d
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156 " add $8,%1\n"
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157
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158 " pmullw %%mm0,%%mm3\n" // mm3 = v*e|v*f|v*g|v*h
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159 " psraw $7,%%mm1\n" // mm1 = v*a/128|v*b/128|v*c/128|v*d/128
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160
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161 " psraw $7,%%mm3\n" // mm3 = v*e/128|v*f/128|v*g/128|v*h/128
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162
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163 " 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
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164
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165 " paddsb %%mm2,%%mm3\n" // add to destination buffer
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166
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167 " movq %%mm3,(%0)\n" // store back to ram
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168 " add $8,%0\n"
539
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169
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170 " dec %%edx\n"
539
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171
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172 " jnz .mixloopS8\n"
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173
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174 ".endS8:\n"
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175 " emms\n"
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176 :
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177 : "r" (dst), "r"(src),"m"(size),
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178 "m"(volume)
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179 : "eax","edx","memory"
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180 );
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181 }
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182 #endif
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183