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562
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1 /*
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2 decode_i586: asm synth
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3
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4 copyright ?-2006 by the mpg123 project - free software under the terms of the LGPL 2.1
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5 see COPYING and AUTHORS files in distribution or http://mpg123.org
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6 initially written by Stefan Bieschewski
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7
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8 synth_1to1 works the same way as the c version of this
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9 file. only two types of changes have been made:
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10 - reordered floating point instructions to
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11 prevent pipline stalls
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12 - made WRITE_SAMPLE use integer instead of
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13 (slower) floating point
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14 all kinds of x86 processors should benefit from these
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15 modifications.
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16
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17 useful sources of information on optimizing x86 code include:
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18
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19 Intel Architecture Optimization Manual
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20 http://www.intel.com/design/pentium/manuals/242816.htm
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21
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22 Cyrix 6x86 Instruction Set Summary
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23 ftp://ftp.cyrix.com/6x86/6x-dbch6.pdf
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24
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25 AMD-K5 Processor Software Development
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26 http://www.amd.com/products/cpg/techdocs/appnotes/20007e.pdf
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27
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28 Stefan Bieschewski <stb@acm.org>
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29
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30 $Id: decode_i586.s 1 2004-09-18 13:30:08Z thomas $
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31 */
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32
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33 #include "mangle.h"
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34
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35 .data
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36 #ifndef __APPLE__
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37 .section .rodata
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38 #endif
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39 ALIGN8
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40 .LC0:
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41 .long 0x0,0x40dfffc0
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42 ALIGN8
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43 .LC1:
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44 .long 0x0,0xc0e00000
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45 ALIGN8
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46 .text
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47 /* int synth_1to1_i586_asm(real *bandPtr, int channel, unsigned char *out, unsigned char *buffs, int *bo, real *decwin); */
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48 .globl ASM_NAME(synth_1to1_i586_asm)
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49 ASM_NAME(synth_1to1_i586_asm):
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50 subl $12,%esp
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51 pushl %ebp
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52 pushl %edi
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53 pushl %esi
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54 pushl %ebx
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55 /* stack: 0=ebx, 4=esi, 8=edi, 12=ebp, 16,20,24=local, 28=back, 32=bandPtr, 36=channel, 40=out, 44=buffs, 48=bo, 52=decwin */
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56 movl 32(%esp),%eax /* *bandPtr */
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57 movl 40(%esp),%esi /* *out */
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58 movl 48(%esp),%edi /* *bo */
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59 movl (%edi),%ebp /* store bo value in ebp */
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60 xorl %edi,%edi
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61 cmpl %edi,36(%esp)
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62 jne .L48 /* if(!channel) */
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63 decl %ebp /* bo-- */
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64 andl $15,%ebp /* bo &= 0xf */
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65 movl 48(%esp), %edi /* *bo */
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66 movl %ebp,(%edi) /* write back bo */
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67 xorl %edi,%edi /* restore %edi to 0; it's used later */
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68 movl 44(%esp),%ecx /* use buffs */
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69 jmp .L49
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70 .L48: /* if(channel) use buffs+2176 */
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71 addl $2,%esi
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72 movl 44(%esp),%ecx /* *buffs */
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73 addl $2176,%ecx
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74 .L49:
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75 testl $1,%ebp
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76 je .L50
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77 movl %ecx,%ebx
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78 movl %ebp,16(%esp)
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79 pushl %eax
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80 movl 20(%esp),%edx
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81 leal (%ebx,%edx,4),%eax
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82 pushl %eax
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83 movl 24(%esp),%eax
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84 incl %eax
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85 andl $15,%eax
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86 leal 1088(,%eax,4),%eax
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87 addl %ebx,%eax
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88 jmp .L74
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89 .L50:
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90 leal 1088(%ecx),%ebx
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91 leal 1(%ebp),%edx
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92 movl %edx,16(%esp)
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93 pushl %eax
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94 leal 1092(%ecx,%ebp,4),%eax
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95 pushl %eax
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96 leal (%ecx,%ebp,4),%eax
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97 .L74:
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98 pushl %eax
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99 call ASM_NAME(dct64_i386)
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100 addl $12,%esp
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101 /* stack now back on track */
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102 movl 16(%esp),%edx
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103 leal 0(,%edx,4),%edx
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104 movl 52(%esp),%eax /* decwin */
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105 addl $64,%eax
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106 movl %eax,%ecx
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107 subl %edx,%ecx
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108 movl $16,%ebp
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109 .L55:
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110 flds (%ecx)
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111 fmuls (%ebx)
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112 flds 4(%ecx)
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113 fmuls 4(%ebx)
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114 fxch %st(1)
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115 flds 8(%ecx)
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116 fmuls 8(%ebx)
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117 fxch %st(2)
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118 fsubrp %st,%st(1)
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119 flds 12(%ecx)
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120 fmuls 12(%ebx)
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121 fxch %st(2)
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122 faddp %st,%st(1)
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123 flds 16(%ecx)
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124 fmuls 16(%ebx)
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125 fxch %st(2)
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126 fsubrp %st,%st(1)
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127 flds 20(%ecx)
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128 fmuls 20(%ebx)
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129 fxch %st(2)
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130 faddp %st,%st(1)
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131 flds 24(%ecx)
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132 fmuls 24(%ebx)
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133 fxch %st(2)
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134 fsubrp %st,%st(1)
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135 flds 28(%ecx)
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136 fmuls 28(%ebx)
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137 fxch %st(2)
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138 faddp %st,%st(1)
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139 flds 32(%ecx)
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140 fmuls 32(%ebx)
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141 fxch %st(2)
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142 fsubrp %st,%st(1)
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143 flds 36(%ecx)
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144 fmuls 36(%ebx)
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145 fxch %st(2)
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146 faddp %st,%st(1)
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147 flds 40(%ecx)
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148 fmuls 40(%ebx)
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149 fxch %st(2)
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150 fsubrp %st,%st(1)
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151 flds 44(%ecx)
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152 fmuls 44(%ebx)
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153 fxch %st(2)
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154 faddp %st,%st(1)
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155 flds 48(%ecx)
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156 fmuls 48(%ebx)
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157 fxch %st(2)
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158 fsubrp %st,%st(1)
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159 flds 52(%ecx)
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160 fmuls 52(%ebx)
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161 fxch %st(2)
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162 faddp %st,%st(1)
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163 flds 56(%ecx)
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164 fmuls 56(%ebx)
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165 fxch %st(2)
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166 fsubrp %st,%st(1)
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167 flds 60(%ecx)
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168 fmuls 60(%ebx)
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169 fxch %st(2)
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170 subl $4,%esp
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171 faddp %st,%st(1)
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172 fxch %st(1)
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173 fsubrp %st,%st(1)
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174 fistpl (%esp)
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175 popl %eax
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176 cmpl $32767,%eax
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177 jg 1f
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178 cmpl $-32768,%eax
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179 jl 2f
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180 movw %ax,(%esi)
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181 jmp 4f
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182 1: movw $32767,(%esi)
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183 jmp 3f
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184 2: movw $-32768,(%esi)
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185 3: incl %edi
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186 4:
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187 .L54:
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188 addl $64,%ebx
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189 subl $-128,%ecx
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190 addl $4,%esi
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191 decl %ebp
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192 jnz .L55
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193 flds (%ecx)
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194 fmuls (%ebx)
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195 flds 8(%ecx)
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196 fmuls 8(%ebx)
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197 flds 16(%ecx)
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198 fmuls 16(%ebx)
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199 fxch %st(2)
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200 faddp %st,%st(1)
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201 flds 24(%ecx)
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202 fmuls 24(%ebx)
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203 fxch %st(2)
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204 faddp %st,%st(1)
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205 flds 32(%ecx)
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206 fmuls 32(%ebx)
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207 fxch %st(2)
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208 faddp %st,%st(1)
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209 flds 40(%ecx)
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210 fmuls 40(%ebx)
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211 fxch %st(2)
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212 faddp %st,%st(1)
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213 flds 48(%ecx)
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214 fmuls 48(%ebx)
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215 fxch %st(2)
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216 faddp %st,%st(1)
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217 flds 56(%ecx)
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218 fmuls 56(%ebx)
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219 fxch %st(2)
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220 subl $4,%esp
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221 faddp %st,%st(1)
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222 fxch %st(1)
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223 faddp %st,%st(1)
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224 fistpl (%esp)
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225 popl %eax
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226 cmpl $32767,%eax
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227 jg 1f
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228 cmpl $-32768,%eax
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229 jl 2f
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230 movw %ax,(%esi)
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231 jmp 4f
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232 1: movw $32767,(%esi)
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233 jmp 3f
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234 2: movw $-32768,(%esi)
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235 3: incl %edi
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236 4:
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237 .L62:
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238 addl $-64,%ebx
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239 addl $4,%esi
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240 movl 16(%esp),%edx
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241 leal -128(%ecx,%edx,8),%ecx
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242 movl $15,%ebp
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243 .L68:
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244 flds -4(%ecx)
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245 fchs
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246 fmuls (%ebx)
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247 flds -8(%ecx)
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248 fmuls 4(%ebx)
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249 fxch %st(1)
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250 flds -12(%ecx)
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251 fmuls 8(%ebx)
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252 fxch %st(2)
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253 fsubrp %st,%st(1)
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254 flds -16(%ecx)
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255 fmuls 12(%ebx)
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256 fxch %st(2)
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257 fsubrp %st,%st(1)
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258 flds -20(%ecx)
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259 fmuls 16(%ebx)
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260 fxch %st(2)
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261 fsubrp %st,%st(1)
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262 flds -24(%ecx)
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263 fmuls 20(%ebx)
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264 fxch %st(2)
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265 fsubrp %st,%st(1)
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266 flds -28(%ecx)
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267 fmuls 24(%ebx)
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268 fxch %st(2)
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269 fsubrp %st,%st(1)
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270 flds -32(%ecx)
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271 fmuls 28(%ebx)
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272 fxch %st(2)
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273 fsubrp %st,%st(1)
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274 flds -36(%ecx)
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275 fmuls 32(%ebx)
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276 fxch %st(2)
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277 fsubrp %st,%st(1)
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278 flds -40(%ecx)
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279 fmuls 36(%ebx)
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280 fxch %st(2)
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281 fsubrp %st,%st(1)
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282 flds -44(%ecx)
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283 fmuls 40(%ebx)
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284 fxch %st(2)
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285 fsubrp %st,%st(1)
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286 flds -48(%ecx)
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287 fmuls 44(%ebx)
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288 fxch %st(2)
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289 fsubrp %st,%st(1)
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290 flds -52(%ecx)
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291 fmuls 48(%ebx)
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292 fxch %st(2)
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293 fsubrp %st,%st(1)
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294 flds -56(%ecx)
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295 fmuls 52(%ebx)
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296 fxch %st(2)
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297 fsubrp %st,%st(1)
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298 flds -60(%ecx)
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299 fmuls 56(%ebx)
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300 fxch %st(2)
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301 fsubrp %st,%st(1)
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302 flds (%ecx)
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303 fmuls 60(%ebx)
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304 fxch %st(2)
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305 subl $4,%esp
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306 fsubrp %st,%st(1)
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307 fxch %st(1)
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308 fsubrp %st,%st(1)
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309 fistpl (%esp)
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310 popl %eax
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311 cmpl $32767,%eax
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312 jg 1f
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313 cmpl $-32768,%eax
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314 jl 2f
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315 movw %ax,(%esi)
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316 jmp 4f
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317 1: movw $32767,(%esi)
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318 jmp 3f
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319 2: movw $-32768,(%esi)
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320 3: incl %edi
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321 4:
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322 .L67:
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323 addl $-64,%ebx
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324 addl $-128,%ecx
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325 addl $4,%esi
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326 decl %ebp
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327 jnz .L68
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328 movl %edi,%eax
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329 popl %ebx
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330 popl %esi
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331 popl %edi
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332 popl %ebp
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333 addl $12,%esp
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334 ret
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335
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336 /* Mark non-executable stack. */
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337 #if defined(__linux__) && defined(__ELF__)
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338 .section .note.GNU-stack,"",%progbits
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339 #endif
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