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annotate src/audio/SDL_mixer_MMX.c @ 844:cd0c77df70a4

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author Sam Lantinga <slouken@libsdl.org>
date Wed, 18 Feb 2004 03:57:13 +0000
parents a9e38f3b8e4d
children b4b64bb88f2f
rev   line source
539
a9e38f3b8e4d Added MMX audio mixing code for gcc (thanks Stephane!)
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1 // MMX assembler version of SDL_MixAudio for signed little endian 16 bit samples and signed 8 bit samples
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2 // Copyright 2002 Stephane Marchesin (stephane.marchesin@wanadoo.fr)
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3 // This code is licensed under the LGPL (see COPYING for details)
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4 //
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5 // Assumes buffer size in bytes is a multiple of 16
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6 // Assumes SDL_MIX_MAXVOLUME = 128
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7
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8
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9 ////////////////////////////////////////////////
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10 // Mixing for 16 bit signed buffers
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11 ////////////////////////////////////////////////
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12
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13 #if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT)
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14 void SDL_MixAudio_MMX_S16(char* dst,char* src,unsigned int size,int volume)
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15 {
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16 __asm__ __volatile__ (
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17
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18 " movl %0,%%edi\n" // edi = dst
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19 " movl %1,%%esi\n" // esi = src
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20 " movl %3,%%eax\n" // eax = volume
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21
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22 " movl %2,%%ebx\n" // ebx = size
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23
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24 " shrl $4,%%ebx\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 (%%esi),%%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(%%esi),%%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 (%%edi),%%mm7\n" // mm7 = dst[0]"
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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(%%edi),%%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 " addl $16,%%esi\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,(%%edi)\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(%%edi)\n"
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95
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96 " addl $16,%%edi\n"
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97
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98 " dec %%ebx\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 : "m" (dst), "m"(src),"m"(size),
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107 "m"(volume)
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108 : "eax","ebx", "esi", "edi","memory"
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109 );
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110 }
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111
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112
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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 %0,%%edi\n" // edi = dst
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123 " movl %1,%%esi\n" // esi = src
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124 " movl %3,%%eax\n" // eax = volume
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125
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126 " movd %%ebx,%%mm0\n"
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127 " movq %%mm0,%%mm1\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 " psllq $16,%%mm0\n"
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133 " por %%mm1,%%mm0\n"
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134
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135 " movl %2,%%ebx\n" // ebx = size
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136 " shr $3,%%ebx\n" // process 8 bytes per iteration = 8 samples
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137
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138 " cmp $0,%%ebx\n"
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139 " je .endS8\n"
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140
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141 ".align 16\n"
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142 " .mixloopS8:\n"
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143
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144 " pxor %%mm2,%%mm2\n" // mm2 = 0
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145 " movq (%%esi),%%mm1\n" // mm1 = a|b|c|d|e|f|g|h
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146
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147 " movq %%mm1,%%mm3\n" // mm3 = a|b|c|d|e|f|g|h
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148
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149 // on va faire le "sign extension" en faisant un cmp avec 0 qui retourne 1 si <0, 0 si >0
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150 " pcmpgtb %%mm1,%%mm2\n" // mm2 = 11111111|00000000|00000000....
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151
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152 " punpckhbw %%mm2,%%mm1\n" // mm1 = 0|a|0|b|0|c|0|d
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153
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154 " punpcklbw %%mm2,%%mm3\n" // mm3 = 0|e|0|f|0|g|0|h
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155 " movq (%%edi),%%mm2\n" // mm2 = destination
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156
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157 " pmullw %%mm0,%%mm1\n" // mm1 = v*a|v*b|v*c|v*d
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158 " addl $8,%%esi\n"
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159
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160 " pmullw %%mm0,%%mm3\n" // mm3 = v*e|v*f|v*g|v*h
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161 " psraw $7,%%mm1\n" // mm1 = v*a/128|v*b/128|v*c/128|v*d/128
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162
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163 " psraw $7,%%mm3\n" // mm3 = v*e/128|v*f/128|v*g/128|v*h/128
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164
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165 " 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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166
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167 " paddsb %%mm2,%%mm3\n" // add to destination buffer
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168
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169 " movq %%mm3,(%%edi)\n" // store back to ram
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170 " addl $8,%%edi\n"
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171
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172 " dec %%ebx\n"
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173
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174 " jnz .mixloopS8\n"
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175
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176 ".endS8:\n"
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177 " emms\n"
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178 :
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179 : "m" (dst), "m"(src),"m"(size),
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180 "m"(volume)
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181 : "eax","ebx", "esi", "edi","memory"
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182 );
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183 }
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184 #endif
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185