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annotate src/audio/SDL_mixer_MMX_VC.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 173c063d4f55
children 450721ad5436
rev   line source
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72ef7ce609ef Greatly simplified the SDL CPU info code
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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 #ifndef __WATCOMC__
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16 #include <windows.h>
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17 #include <stdio.h>
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18 #endif
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19
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20 void SDL_MixAudio_MMX_S16_VC(char* dst,char* src,unsigned int nSize,int volume)
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21 {
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22 __asm
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23 {
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24
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25 push edi
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26 push esi
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27 push ebx
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28
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29 mov edi, dst // edi = dst
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30 mov esi, src // esi = src
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31 mov eax, volume // eax = volume
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32 mov ebx, nSize // ebx = size
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33 shr ebx, 4 // process 16 bytes per iteration = 8 samples
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34 jz endS16
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35
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36 pxor mm0, mm0
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37 movd mm0, eax //%%eax,%%mm0
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38 movq mm1, mm0 //%%mm0,%%mm1
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39 psllq mm0, 16 //$16,%%mm0
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40 por mm0, mm1 //%%mm1,%%mm0
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41 psllq mm0, 16 //$16,%%mm0
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42 por mm0, mm1 //%%mm1,%%mm0
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43 psllq mm0, 16 //$16,%%mm0
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44 por mm0, mm1 //%%mm1,%%mm0 // mm0 = vol|vol|vol|vol
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45
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46 #ifndef __WATCOMC__
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b4117292e587 Mixer: Visual C MMX asm code now aligns loops to 16 bytes.
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47 align 16
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48 #endif
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49 mixloopS16:
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50 movq mm1, [esi] //(%%esi),%%mm1\n" // mm1 = a|b|c|d
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51 movq mm2, mm1 //%%mm1,%%mm2\n" // mm2 = a|b|c|d
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52 movq mm4, [esi + 8] //8(%%esi),%%mm4\n" // mm4 = e|f|g|h
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53 // pre charger le buffer dst dans mm7
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54 movq mm7, [edi] //(%%edi),%%mm7\n" // mm7 = dst[0]"
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55 // multiplier par le volume
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56 pmullw mm1, mm0 //%%mm0,%%mm1\n" // mm1 = l(a*v)|l(b*v)|l(c*v)|l(d*v)
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57 pmulhw mm2, mm0 //%%mm0,%%mm2\n" // mm2 = h(a*v)|h(b*v)|h(c*v)|h(d*v)
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58 movq mm5, mm4 //%%mm4,%%mm5\n" // mm5 = e|f|g|h
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59 pmullw mm4, mm0 //%%mm0,%%mm4\n" // mm4 = l(e*v)|l(f*v)|l(g*v)|l(h*v)
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60 pmulhw mm5, mm0 //%%mm0,%%mm5\n" // mm5 = h(e*v)|h(f*v)|h(g*v)|h(h*v)
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61 movq mm3, mm1 //%%mm1,%%mm3\n" // mm3 = l(a*v)|l(b*v)|l(c*v)|l(d*v)
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62 punpckhwd mm1, mm2 //%%mm2,%%mm1\n" // mm1 = a*v|b*v
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63 movq mm6, mm4 //%%mm4,%%mm6\n" // mm6 = l(e*v)|l(f*v)|l(g*v)|l(h*v)
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64 punpcklwd mm3, mm2 //%%mm2,%%mm3\n" // mm3 = c*v|d*v
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65 punpckhwd mm4, mm5 //%%mm5,%%mm4\n" // mm4 = e*f|f*v
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66 punpcklwd mm6, mm5 //%%mm5,%%mm6\n" // mm6 = g*v|h*v
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67 // pre charger le buffer dst dans mm5
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68 movq mm5, [edi + 8] //8(%%edi),%%mm5\n" // mm5 = dst[1]
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69 // diviser par 128
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70 psrad mm1, 7 //$7,%%mm1\n" // mm1 = a*v/128|b*v/128 , 128 = SDL_MIX_MAXVOLUME
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71 add esi, 16 //$16,%%esi\n"
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72 psrad mm3, 7 //$7,%%mm3\n" // mm3 = c*v/128|d*v/128
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73 psrad mm4, 7 //$7,%%mm4\n" // mm4 = e*v/128|f*v/128
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74 // mm1 = le sample avec le volume modifie
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75 packssdw mm3, mm1 //%%mm1,%%mm3\n" // mm3 = s(a*v|b*v|c*v|d*v)
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76 psrad mm6, 7 //$7,%%mm6\n" // mm6= g*v/128|h*v/128
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77 paddsw mm3, mm7 //%%mm7,%%mm3\n" // mm3 = adjust_volume(src)+dst
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78 // mm4 = le sample avec le volume modifie
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79 packssdw mm6, mm4 //%%mm4,%%mm6\n" // mm6 = s(e*v|f*v|g*v|h*v)
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80 movq [edi], mm3 //%%mm3,(%%edi)\n"
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81 paddsw mm6, mm5 //%%mm5,%%mm6\n" // mm6 = adjust_volume(src)+dst
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82 movq [edi + 8], mm6 //%%mm6,8(%%edi)\n"
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83 add edi, 16 //$16,%%edi\n"
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84 dec ebx //%%ebx\n"
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85 jnz mixloopS16
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86
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87 ends16:
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88 emms
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89
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90 pop ebx
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91 pop esi
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92 pop edi
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93 }
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94
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95 }
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96
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97 ////////////////////////////////////////////////
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98 // Mixing for 8 bit signed buffers
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99 ////////////////////////////////////////////////
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100
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101 void SDL_MixAudio_MMX_S8_VC(char* dst,char* src,unsigned int nSize,int volume)
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102 {
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103 _asm
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104 {
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105
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106 push edi
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107 push esi
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108 push ebx
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109
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110 mov edi, dst //movl %0,%%edi // edi = dst
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111 mov esi, src //%1,%%esi // esi = src
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112 mov eax, volume //%3,%%eax // eax = volume
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113
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114 movd mm0, eax //%%eax,%%mm0
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115 movq mm1, mm0 //%%mm0,%%mm1
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116 psllq mm0, 16 //$16,%%mm0
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117 por mm0, mm1 //%%mm1,%%mm0
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118 psllq mm0, 16 //$16,%%mm0
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119 por mm0, mm1 //%%mm1,%%mm0
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120 psllq mm0, 16 //$16,%%mm0
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121 por mm0, mm1 //%%mm1,%%mm0
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122
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123 mov ebx, nSize //%2,%%ebx // ebx = size
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124 shr ebx, 3 //$3,%%ebx // process 8 bytes per iteration = 8 samples
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125 cmp ebx, 0 //$0,%%ebx
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126 je endS8
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127
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128 #ifndef __WATCOMC__
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129 align 16
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130 #endif
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131 mixloopS8:
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132 pxor mm2, mm2 //%%mm2,%%mm2 // mm2 = 0
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133 movq mm1, [esi] //(%%esi),%%mm1 // mm1 = a|b|c|d|e|f|g|h
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134 movq mm3, mm1 //%%mm1,%%mm3 // mm3 = a|b|c|d|e|f|g|h
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135 // on va faire le "sign extension" en faisant un cmp avec 0 qui retourne 1 si <0, 0 si >0
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136 pcmpgtb mm2, mm1 //%%mm1,%%mm2 // mm2 = 11111111|00000000|00000000....
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137 punpckhbw mm1, mm2 //%%mm2,%%mm1 // mm1 = 0|a|0|b|0|c|0|d
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138 punpcklbw mm3, mm2 //%%mm2,%%mm3 // mm3 = 0|e|0|f|0|g|0|h
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139 movq mm2, [edi] //(%%edi),%%mm2 // mm2 = destination
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140 pmullw mm1, mm0 //%%mm0,%%mm1 // mm1 = v*a|v*b|v*c|v*d
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141 add esi, 8 //$8,%%esi
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142 pmullw mm3, mm0 //%%mm0,%%mm3 // mm3 = v*e|v*f|v*g|v*h
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143 psraw mm1, 7 //$7,%%mm1 // mm1 = v*a/128|v*b/128|v*c/128|v*d/128
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144 psraw mm3, 7 //$7,%%mm3 // mm3 = v*e/128|v*f/128|v*g/128|v*h/128
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145 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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146 paddsb mm3, mm2 //%%mm2,%%mm3 // add to destination buffer
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147 movq [edi], mm3 //%%mm3,(%%edi) // store back to ram
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148 add edi, 8 //$8,%%edi
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149 dec ebx //%%ebx
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150 jnz mixloopS8
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151
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152 endS8:
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153 emms
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154
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155 pop ebx
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156 pop esi
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157 pop edi
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158 }
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159 }
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160
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161 #endif /* USE_ASM_MIXER_VC */