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1 /*
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2 dct64_i486.c: DCT64, a plain C variant for i486
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3
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4 copyright 1998-2006 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 Fabrice Bellard
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7 */
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8
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9 /* Discrete Cosine Tansform (DCT) for subband synthesis.
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10 *
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11 * This code is optimized for 80486. It should be compiled with gcc
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12 * 2.7.2 or higher.
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13 *
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14 * Note: This code does not give the necessary accuracy. Moreover, no
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15 * overflow test are done.
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16 *
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17 * (c) 1998 Fabrice Bellard.
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18 */
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19
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20 #include "mpg123lib_intern.h"
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21
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22 #define COS_0_0 16403
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23 #define COS_0_1 16563
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24 #define COS_0_2 16890
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25 #define COS_0_3 17401
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26 #define COS_0_4 18124
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27 #define COS_0_5 19101
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28 #define COS_0_6 20398
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29 #define COS_0_7 22112
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30 #define COS_0_8 24396
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31 #define COS_0_9 27503
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32 #define COS_0_10 31869
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33 #define COS_0_11 38320
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34 #define COS_0_12 48633
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35 #define COS_0_13 67429
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36 #define COS_0_14 111660
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37 #define COS_0_15 333906
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38 #define COS_1_0 16463
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39 #define COS_1_1 17121
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40 #define COS_1_2 18577
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41 #define COS_1_3 21195
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42 #define COS_1_4 25826
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43 #define COS_1_5 34756
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44 #define COS_1_6 56441
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45 #define COS_1_7 167154
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46 #define COS_2_0 16704
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47 #define COS_2_1 19704
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48 #define COS_2_2 29490
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49 #define COS_2_3 83981
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50 #define COS_3_0 17733
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51 #define COS_3_1 42813
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52 #define COS_4_0 23170
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53
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54 #define SETOUT(out,n,expr) out[FIR_BUFFER_SIZE*(n)]=(expr)
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55 #define MULL(a,b) (((long long)(a)*(long long)(b)) >> 15)
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56 #define MUL(a,b) \
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57 (\
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58 ((!(b & 0x3F)) ? (((a)*(b >> 6)) >> 9) :\
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59 ((!(b & 0x1F)) ? (((a)*(b >> 5)) >> 10) :\
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60 ((!(b & 0x0F)) ? (((a)*(b >> 4)) >> 11) :\
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61 ((!(b & 0x07)) ? (((a)*(b >> 3)) >> 12) :\
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62 ((!(b & 0x03)) ? (((a)*(b >> 2)) >> 13) :\
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63 ((!(b & 0x01)) ? (((a)*(b >> 1)) >> 14) :\
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64 (((a)*(b )) >> 15))))))))
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65
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66
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67 void dct64_1_486(int *out0,int *out1,int *b1,int *b2)
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68 {
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69 b1[0x00] = b2[0x00] + b2[0x1F];
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70 b1[0x1F] = MUL((b2[0x00] - b2[0x1F]),COS_0_0);
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71
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72 b1[0x01] = b2[0x01] + b2[0x1E];
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73 b1[0x1E] = MUL((b2[0x01] - b2[0x1E]),COS_0_1);
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74
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75 b1[0x02] = b2[0x02] + b2[0x1D];
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76 b1[0x1D] = MUL((b2[0x02] - b2[0x1D]),COS_0_2);
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77
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78 b1[0x03] = b2[0x03] + b2[0x1C];
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79 b1[0x1C] = MUL((b2[0x03] - b2[0x1C]),COS_0_3);
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80
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81 b1[0x04] = b2[0x04] + b2[0x1B];
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82 b1[0x1B] = MUL((b2[0x04] - b2[0x1B]),COS_0_4);
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83
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84 b1[0x05] = b2[0x05] + b2[0x1A];
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85 b1[0x1A] = MUL((b2[0x05] - b2[0x1A]),COS_0_5);
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86
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87 b1[0x06] = b2[0x06] + b2[0x19];
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88 b1[0x19] = MUL((b2[0x06] - b2[0x19]),COS_0_6);
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89
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90 b1[0x07] = b2[0x07] + b2[0x18];
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91 b1[0x18] = MUL((b2[0x07] - b2[0x18]),COS_0_7);
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92
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93 b1[0x08] = b2[0x08] + b2[0x17];
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94 b1[0x17] = MUL((b2[0x08] - b2[0x17]),COS_0_8);
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95
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96 b1[0x09] = b2[0x09] + b2[0x16];
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97 b1[0x16] = MUL((b2[0x09] - b2[0x16]),COS_0_9);
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98
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99 b1[0x0A] = b2[0x0A] + b2[0x15];
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100 b1[0x15] = MUL((b2[0x0A] - b2[0x15]),COS_0_10);
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101
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102 b1[0x0B] = b2[0x0B] + b2[0x14];
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103 b1[0x14] = MUL((b2[0x0B] - b2[0x14]),COS_0_11);
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104
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105 b1[0x0C] = b2[0x0C] + b2[0x13];
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106 b1[0x13] = MUL((b2[0x0C] - b2[0x13]),COS_0_12);
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107
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108 b1[0x0D] = b2[0x0D] + b2[0x12];
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109 b1[0x12] = MULL((b2[0x0D] - b2[0x12]),COS_0_13);
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110
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111 b1[0x0E] = b2[0x0E] + b2[0x11];
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112 b1[0x11] = MULL((b2[0x0E] - b2[0x11]),COS_0_14);
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113
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114 b1[0x0F] = b2[0x0F] + b2[0x10];
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115 b1[0x10] = MULL((b2[0x0F] - b2[0x10]),COS_0_15);
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116
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117
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118 b2[0x00] = b1[0x00] + b1[0x0F];
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119 b2[0x0F] = MUL((b1[0x00] - b1[0x0F]),COS_1_0);
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120 b2[0x01] = b1[0x01] + b1[0x0E];
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121 b2[0x0E] = MUL((b1[0x01] - b1[0x0E]),COS_1_1);
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122 b2[0x02] = b1[0x02] + b1[0x0D];
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123 b2[0x0D] = MUL((b1[0x02] - b1[0x0D]),COS_1_2);
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124 b2[0x03] = b1[0x03] + b1[0x0C];
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125 b2[0x0C] = MUL((b1[0x03] - b1[0x0C]),COS_1_3);
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126 b2[0x04] = b1[0x04] + b1[0x0B];
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127 b2[0x0B] = MUL((b1[0x04] - b1[0x0B]),COS_1_4);
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128 b2[0x05] = b1[0x05] + b1[0x0A];
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129 b2[0x0A] = MUL((b1[0x05] - b1[0x0A]),COS_1_5);
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130 b2[0x06] = b1[0x06] + b1[0x09];
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131 b2[0x09] = MUL((b1[0x06] - b1[0x09]),COS_1_6);
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132 b2[0x07] = b1[0x07] + b1[0x08];
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133 b2[0x08] = MULL((b1[0x07] - b1[0x08]),COS_1_7);
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134
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135 b2[0x10] = b1[0x10] + b1[0x1F];
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136 b2[0x1F] = MUL((b1[0x1F] - b1[0x10]),COS_1_0);
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137 b2[0x11] = b1[0x11] + b1[0x1E];
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138 b2[0x1E] = MUL((b1[0x1E] - b1[0x11]),COS_1_1);
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139 b2[0x12] = b1[0x12] + b1[0x1D];
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140 b2[0x1D] = MUL((b1[0x1D] - b1[0x12]),COS_1_2);
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141 b2[0x13] = b1[0x13] + b1[0x1C];
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142 b2[0x1C] = MUL((b1[0x1C] - b1[0x13]),COS_1_3);
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143 b2[0x14] = b1[0x14] + b1[0x1B];
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144 b2[0x1B] = MUL((b1[0x1B] - b1[0x14]),COS_1_4);
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145 b2[0x15] = b1[0x15] + b1[0x1A];
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146 b2[0x1A] = MUL((b1[0x1A] - b1[0x15]),COS_1_5);
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147 b2[0x16] = b1[0x16] + b1[0x19];
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148 b2[0x19] = MUL((b1[0x19] - b1[0x16]),COS_1_6);
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149 b2[0x17] = b1[0x17] + b1[0x18];
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150 b2[0x18] = MULL((b1[0x18] - b1[0x17]),COS_1_7);
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151
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152
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153 b1[0x00] = b2[0x00] + b2[0x07];
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154 b1[0x07] = MUL((b2[0x00] - b2[0x07]),COS_2_0);
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155 b1[0x01] = b2[0x01] + b2[0x06];
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156 b1[0x06] = MUL((b2[0x01] - b2[0x06]),COS_2_1);
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157 b1[0x02] = b2[0x02] + b2[0x05];
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158 b1[0x05] = MUL((b2[0x02] - b2[0x05]),COS_2_2);
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159 b1[0x03] = b2[0x03] + b2[0x04];
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160 b1[0x04] = MULL((b2[0x03] - b2[0x04]),COS_2_3);
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161
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162 b1[0x08] = b2[0x08] + b2[0x0F];
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163 b1[0x0F] = MUL((b2[0x0F] - b2[0x08]),COS_2_0);
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164 b1[0x09] = b2[0x09] + b2[0x0E];
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165 b1[0x0E] = MUL((b2[0x0E] - b2[0x09]),COS_2_1);
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166 b1[0x0A] = b2[0x0A] + b2[0x0D];
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167 b1[0x0D] = MUL((b2[0x0D] - b2[0x0A]),COS_2_2);
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168 b1[0x0B] = b2[0x0B] + b2[0x0C];
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169 b1[0x0C] = MULL((b2[0x0C] - b2[0x0B]),COS_2_3);
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170
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171 b1[0x10] = b2[0x10] + b2[0x17];
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172 b1[0x17] = MUL((b2[0x10] - b2[0x17]),COS_2_0);
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173 b1[0x11] = b2[0x11] + b2[0x16];
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174 b1[0x16] = MUL((b2[0x11] - b2[0x16]),COS_2_1);
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175 b1[0x12] = b2[0x12] + b2[0x15];
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176 b1[0x15] = MUL((b2[0x12] - b2[0x15]),COS_2_2);
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177 b1[0x13] = b2[0x13] + b2[0x14];
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178 b1[0x14] = MULL((b2[0x13] - b2[0x14]),COS_2_3);
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179
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180 b1[0x18] = b2[0x18] + b2[0x1F];
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181 b1[0x1F] = MUL((b2[0x1F] - b2[0x18]),COS_2_0);
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182 b1[0x19] = b2[0x19] + b2[0x1E];
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183 b1[0x1E] = MUL((b2[0x1E] - b2[0x19]),COS_2_1);
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184 b1[0x1A] = b2[0x1A] + b2[0x1D];
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185 b1[0x1D] = MUL((b2[0x1D] - b2[0x1A]),COS_2_2);
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186 b1[0x1B] = b2[0x1B] + b2[0x1C];
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187 b1[0x1C] = MULL((b2[0x1C] - b2[0x1B]),COS_2_3);
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188
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189
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190 b2[0x00] = b1[0x00] + b1[0x03];
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191 b2[0x03] = MUL((b1[0x00] - b1[0x03]),COS_3_0);
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192 b2[0x01] = b1[0x01] + b1[0x02];
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193 b2[0x02] = MUL((b1[0x01] - b1[0x02]),COS_3_1);
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194
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195 b2[0x04] = b1[0x04] + b1[0x07];
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196 b2[0x07] = MUL((b1[0x07] - b1[0x04]),COS_3_0);
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197 b2[0x05] = b1[0x05] + b1[0x06];
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198 b2[0x06] = MUL((b1[0x06] - b1[0x05]),COS_3_1);
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199
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200 b2[0x08] = b1[0x08] + b1[0x0B];
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201 b2[0x0B] = MUL((b1[0x08] - b1[0x0B]),COS_3_0);
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202 b2[0x09] = b1[0x09] + b1[0x0A];
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203 b2[0x0A] = MUL((b1[0x09] - b1[0x0A]),COS_3_1);
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204
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205 b2[0x0C] = b1[0x0C] + b1[0x0F];
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206 b2[0x0F] = MUL((b1[0x0F] - b1[0x0C]),COS_3_0);
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207 b2[0x0D] = b1[0x0D] + b1[0x0E];
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208 b2[0x0E] = MUL((b1[0x0E] - b1[0x0D]),COS_3_1);
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209
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210 b2[0x10] = b1[0x10] + b1[0x13];
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211 b2[0x13] = MUL((b1[0x10] - b1[0x13]),COS_3_0);
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212 b2[0x11] = b1[0x11] + b1[0x12];
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213 b2[0x12] = MUL((b1[0x11] - b1[0x12]),COS_3_1);
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214
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215 b2[0x14] = b1[0x14] + b1[0x17];
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216 b2[0x17] = MUL((b1[0x17] - b1[0x14]),COS_3_0);
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217 b2[0x15] = b1[0x15] + b1[0x16];
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218 b2[0x16] = MUL((b1[0x16] - b1[0x15]),COS_3_1);
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219
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220 b2[0x18] = b1[0x18] + b1[0x1B];
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221 b2[0x1B] = MUL((b1[0x18] - b1[0x1B]),COS_3_0);
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222 b2[0x19] = b1[0x19] + b1[0x1A];
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223 b2[0x1A] = MUL((b1[0x19] - b1[0x1A]),COS_3_1);
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224
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225 b2[0x1C] = b1[0x1C] + b1[0x1F];
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226 b2[0x1F] = MUL((b1[0x1F] - b1[0x1C]),COS_3_0);
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227 b2[0x1D] = b1[0x1D] + b1[0x1E];
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228 b2[0x1E] = MUL((b1[0x1E] - b1[0x1D]),COS_3_1);
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229
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230 {
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231 int i;
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232 for(i=0;i<32;i+=4) {
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233 b1[i+0x00] = b2[i+0x00] + b2[i+0x01];
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234 b1[i+0x01] = MUL((b2[i+0x00] - b2[i+0x01]),COS_4_0);
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235 b1[i+0x02] = b2[i+0x02] + b2[i+0x03];
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236 b1[i+0x03] = MUL((b2[i+0x03] - b2[i+0x02]),COS_4_0);
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237 }
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238 }
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239
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240 b1[0x02] += b1[0x03];
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241 b1[0x06] += b1[0x07];
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242 b1[0x04] += b1[0x06];
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243 b1[0x06] += b1[0x05];
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244 b1[0x05] += b1[0x07];
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245
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246 b1[0x0A] += b1[0x0B];
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247 b1[0x0E] += b1[0x0F];
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248 b1[0x0C] += b1[0x0E];
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249 b1[0x0E] += b1[0x0D];
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250 b1[0x0D] += b1[0x0F];
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251
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252 b1[0x12] += b1[0x13];
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253 b1[0x16] += b1[0x17];
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254 b1[0x14] += b1[0x16];
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255 b1[0x16] += b1[0x15];
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256 b1[0x15] += b1[0x17];
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257
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258 b1[0x1A] += b1[0x1B];
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259 b1[0x1E] += b1[0x1F];
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260 b1[0x1C] += b1[0x1E];
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261 b1[0x1E] += b1[0x1D];
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262 b1[0x1D] += b1[0x1F];
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263
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264 SETOUT(out0,16,b1[0x00]);
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265 SETOUT(out0,12,b1[0x04]);
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266 SETOUT(out0, 8,b1[0x02]);
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267 SETOUT(out0, 4,b1[0x06]);
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268 SETOUT(out0, 0,b1[0x01]);
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269 SETOUT(out1, 0,b1[0x01]);
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270 SETOUT(out1, 4,b1[0x05]);
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271 SETOUT(out1, 8,b1[0x03]);
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272 SETOUT(out1,12,b1[0x07]);
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273
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274 b1[0x08] += b1[0x0C];
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275 SETOUT(out0,14,b1[0x08]);
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276 b1[0x0C] += b1[0x0a];
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277 SETOUT(out0,10,b1[0x0C]);
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278 b1[0x0A] += b1[0x0E];
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279 SETOUT(out0, 6,b1[0x0A]);
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280 b1[0x0E] += b1[0x09];
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281 SETOUT(out0, 2,b1[0x0E]);
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282 b1[0x09] += b1[0x0D];
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283 SETOUT(out1, 2,b1[0x09]);
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284 b1[0x0D] += b1[0x0B];
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285 SETOUT(out1, 6,b1[0x0D]);
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286 b1[0x0B] += b1[0x0F];
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287 SETOUT(out1,10,b1[0x0B]);
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288 SETOUT(out1,14,b1[0x0F]);
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289
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290 b1[0x18] += b1[0x1C];
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291 SETOUT(out0,15,b1[0x10] + b1[0x18]);
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292 SETOUT(out0,13,b1[0x18] + b1[0x14]);
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293 b1[0x1C] += b1[0x1a];
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294 SETOUT(out0,11,b1[0x14] + b1[0x1C]);
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295 SETOUT(out0, 9,b1[0x1C] + b1[0x12]);
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296 b1[0x1A] += b1[0x1E];
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297 SETOUT(out0, 7,b1[0x12] + b1[0x1A]);
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298 SETOUT(out0, 5,b1[0x1A] + b1[0x16]);
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299 b1[0x1E] += b1[0x19];
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300 SETOUT(out0, 3,b1[0x16] + b1[0x1E]);
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301 SETOUT(out0, 1,b1[0x1E] + b1[0x11]);
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302 b1[0x19] += b1[0x1D];
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303 SETOUT(out1, 1,b1[0x11] + b1[0x19]);
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304 SETOUT(out1, 3,b1[0x19] + b1[0x15]);
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305 b1[0x1D] += b1[0x1B];
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306 SETOUT(out1, 5,b1[0x15] + b1[0x1D]);
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307 SETOUT(out1, 7,b1[0x1D] + b1[0x13]);
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308 b1[0x1B] += b1[0x1F];
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309 SETOUT(out1, 9,b1[0x13] + b1[0x1B]);
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310 SETOUT(out1,11,b1[0x1B] + b1[0x17]);
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311 SETOUT(out1,13,b1[0x17] + b1[0x1F]);
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312 SETOUT(out1,15,b1[0x1F]);
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313 }
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314
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315
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316 /*
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317 * the call via dct64 is a trick to force GCC to use
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318 * (new) registers for the b1,b2 pointer to the bufs[xx] field
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319 */
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320 void dct64_i486(int *a,int *b,real *samples)
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321 {
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322 int bufs[64];
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323 int i;
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324
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325 #ifdef REAL_IS_FIXED
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326 #define TOINT(a) ((a) * 32768 / (int)REAL_FACTOR)
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327
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328 for(i=0;i<32;i++) {
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329 bufs[i]=TOINT(samples[i]);
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330 }
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331 #else
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332 int *p = bufs;
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333 register double const scale = ((65536.0 * 32) + 1) * 65536.0;
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334
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335 for(i=0;i<32;i++) {
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336 *((double *) (p++)) = scale + *samples++; /* beware on bufs overrun: 8B store from x87 */
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337 }
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338 #endif
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339
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340 dct64_1_486(a,b,bufs+32,bufs);
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341 }
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342
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