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

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*** empty log message ***
author Sam Lantinga <slouken@libsdl.org>
date Wed, 18 Feb 2004 03:57:13 +0000
parents 72ef7ce609ef
children b4117292e587
rev   line source
746
72ef7ce609ef Greatly simplified the SDL CPU info code
Sam Lantinga <slouken@libsdl.org>
parents: 574
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1 #if defined(USE_ASM_MIXER_VC)
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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 // Converted to Intel ASM notation by Cth
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5 // This code is licensed under the LGPL (see COPYING for details)
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6 //
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7 // Assumes buffer size in bytes is a multiple of 16
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8 // Assumes SDL_MIX_MAXVOLUME = 128
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9
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10
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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 #include <windows.h>
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16 #include <stdio.h>
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17
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18 void SDL_MixAudio_MMX_S16_VC(char* dst,char* src,unsigned int nSize,int volume)
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19 {
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20 __asm
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21 {
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22 align 16
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23
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24 push edi
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25 push esi
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26 push ebx
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27
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28 mov edi, dst // edi = dst
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29 mov esi, src // esi = src
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30 mov eax, volume // eax = volume
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31 mov ebx, nSize // ebx = size
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32 shr ebx, 4 // process 16 bytes per iteration = 8 samples
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33 jz endS16
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34
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35 pxor mm0, mm0
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36 movd mm0, eax //%%eax,%%mm0
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37 movq mm1, mm0 //%%mm0,%%mm1
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38 psllq mm0, 16 //$16,%%mm0
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39 por mm0, mm1 //%%mm1,%%mm0
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40 psllq mm0, 16 //$16,%%mm0
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41 por mm0, mm1 //%%mm1,%%mm0
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42 psllq mm0, 16 //$16,%%mm0
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43 por mm0, mm1 //%%mm1,%%mm0 // mm0 = vol|vol|vol|vol
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44
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45 mixloopS16:
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46 movq mm1, [esi] //(%%esi),%%mm1\n" // mm1 = a|b|c|d
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47 movq mm2, mm1 //%%mm1,%%mm2\n" // mm2 = a|b|c|d
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48 movq mm4, [esi + 8] //8(%%esi),%%mm4\n" // mm4 = e|f|g|h
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49 // pre charger le buffer dst dans mm7
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50 movq mm7, [edi] //(%%edi),%%mm7\n" // mm7 = dst[0]"
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51 // multiplier par le volume
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52 pmullw mm1, mm0 //%%mm0,%%mm1\n" // mm1 = l(a*v)|l(b*v)|l(c*v)|l(d*v)
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53 pmulhw mm2, mm0 //%%mm0,%%mm2\n" // mm2 = h(a*v)|h(b*v)|h(c*v)|h(d*v)
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54 movq mm5, mm4 //%%mm4,%%mm5\n" // mm5 = e|f|g|h
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55 pmullw mm4, mm0 //%%mm0,%%mm4\n" // mm4 = l(e*v)|l(f*v)|l(g*v)|l(h*v)
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56 pmulhw mm5, mm0 //%%mm0,%%mm5\n" // mm5 = h(e*v)|h(f*v)|h(g*v)|h(h*v)
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57 movq mm3, mm1 //%%mm1,%%mm3\n" // mm3 = l(a*v)|l(b*v)|l(c*v)|l(d*v)
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58 punpckhwd mm1, mm2 //%%mm2,%%mm1\n" // mm1 = a*v|b*v
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59 movq mm6, mm4 //%%mm4,%%mm6\n" // mm6 = l(e*v)|l(f*v)|l(g*v)|l(h*v)
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60 punpcklwd mm3, mm2 //%%mm2,%%mm3\n" // mm3 = c*v|d*v
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61 punpckhwd mm4, mm5 //%%mm5,%%mm4\n" // mm4 = e*f|f*v
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62 punpcklwd mm6, mm5 //%%mm5,%%mm6\n" // mm6 = g*v|h*v
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63 // pre charger le buffer dst dans mm5
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64 movq mm5, [edi + 8] //8(%%edi),%%mm5\n" // mm5 = dst[1]
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65 // diviser par 128
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66 psrad mm1, 7 //$7,%%mm1\n" // mm1 = a*v/128|b*v/128 , 128 = SDL_MIX_MAXVOLUME
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67 add esi, 16 //$16,%%esi\n"
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68 psrad mm3, 7 //$7,%%mm3\n" // mm3 = c*v/128|d*v/128
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69 psrad mm4, 7 //$7,%%mm4\n" // mm4 = e*v/128|f*v/128
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70 // mm1 = le sample avec le volume modifie
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71 packssdw mm3, mm1 //%%mm1,%%mm3\n" // mm3 = s(a*v|b*v|c*v|d*v)
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72 psrad mm6, 7 //$7,%%mm6\n" // mm6= g*v/128|h*v/128
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73 paddsw mm3, mm7 //%%mm7,%%mm3\n" // mm3 = adjust_volume(src)+dst
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74 // mm4 = le sample avec le volume modifie
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75 packssdw mm6, mm4 //%%mm4,%%mm6\n" // mm6 = s(e*v|f*v|g*v|h*v)
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76 movq [edi], mm3 //%%mm3,(%%edi)\n"
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77 paddsw mm6, mm5 //%%mm5,%%mm6\n" // mm6 = adjust_volume(src)+dst
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78 movq [edi + 8], mm6 //%%mm6,8(%%edi)\n"
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79 add edi, 16 //$16,%%edi\n"
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80 dec ebx //%%ebx\n"
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81 jnz mixloopS16
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82
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83 ends16:
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84 emms
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85
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86 pop ebx
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87 pop esi
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88 pop edi
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89 }
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90
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91 }
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92
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93 ////////////////////////////////////////////////
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94 // Mixing for 8 bit signed buffers
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95 ////////////////////////////////////////////////
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96
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97 void SDL_MixAudio_MMX_S8_VC(char* dst,char* src,unsigned int nSize,int volume)
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98 {
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99 _asm
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100 {
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101 align 16
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102
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103 push edi
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104 push esi
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105 push ebx
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106
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107 mov edi, dst //movl %0,%%edi // edi = dst
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108 mov esi, src //%1,%%esi // esi = src
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109 mov eax, volume //%3,%%eax // eax = volume
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110
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111 movd mm0, ebx //%%ebx,%%mm0
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112 movq mm1, mm0 //%%mm0,%%mm1
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113 psllq mm0, 16 //$16,%%mm0
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114 por mm0, mm1 //%%mm1,%%mm0
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115 psllq mm0, 16 //$16,%%mm0
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116 por mm0, mm1 //%%mm1,%%mm0
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117 psllq mm0, 16 //$16,%%mm0
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118 por mm0, mm1 //%%mm1,%%mm0
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119
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120 mov ebx, nSize //%2,%%ebx // ebx = size
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121 shr ebx, 3 //$3,%%ebx // process 8 bytes per iteration = 8 samples
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122 cmp ebx, 0 //$0,%%ebx
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123 je endS8
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124
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125 mixloopS8:
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126 pxor mm2, mm2 //%%mm2,%%mm2 // mm2 = 0
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127 movq mm1, [esi] //(%%esi),%%mm1 // mm1 = a|b|c|d|e|f|g|h
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128 movq mm3, mm1 //%%mm1,%%mm3 // mm3 = a|b|c|d|e|f|g|h
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129 // on va faire le "sign extension" en faisant un cmp avec 0 qui retourne 1 si <0, 0 si >0
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130 pcmpgtb mm2, mm1 //%%mm1,%%mm2 // mm2 = 11111111|00000000|00000000....
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131 punpckhbw mm1, mm2 //%%mm2,%%mm1 // mm1 = 0|a|0|b|0|c|0|d
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132 punpcklbw mm3, mm2 //%%mm2,%%mm3 // mm3 = 0|e|0|f|0|g|0|h
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133 movq mm2, [edi] //(%%edi),%%mm2 // mm2 = destination
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134 pmullw mm1, mm0 //%%mm0,%%mm1 // mm1 = v*a|v*b|v*c|v*d
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135 add esi, 8 //$8,%%esi
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136 pmullw mm3, mm0 //%%mm0,%%mm3 // mm3 = v*e|v*f|v*g|v*h
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137 psraw mm1, 7 //$7,%%mm1 // mm1 = v*a/128|v*b/128|v*c/128|v*d/128
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138 psraw mm3, 7 //$7,%%mm3 // mm3 = v*e/128|v*f/128|v*g/128|v*h/128
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139 packsswb mm3, mm1 //%%mm1,%%mm3 // 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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140 paddsb mm3, mm2 //%%mm2,%%mm3 // add to destination buffer
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141 movq [edi], mm3 //%%mm3,(%%edi) // store back to ram
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142 add edi, 8 //$8,%%edi
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143 dec ebx //%%ebx
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144 jnz mixloopS8
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145
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146 endS8:
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147 emms
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148
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149 pop ebx
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150 pop esi
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151 pop edi
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152 }
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153 }
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154
746
72ef7ce609ef Greatly simplified the SDL CPU info code
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155 #endif /* USE_ASM_MIXER_VC */