1 | |
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2 | #define divnorm(num, den, sign) \ |
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3 | { \ |
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4 | if (num < 0) \ |
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5 | { \ |
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6 | num = -num; \ |
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7 | sign = 1; \ |
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8 | } \ |
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9 | else \ |
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10 | { \ |
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11 | sign = 0; \ |
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12 | } \ |
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13 | \ |
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14 | if (den < 0) \ |
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15 | { \ |
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16 | den = - den; \ |
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17 | sign = 1 - sign; \ |
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18 | } \ |
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19 | } |
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20 | |
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21 | |
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22 | |
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23 | |
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24 | |
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25 | static unsigned long |
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26 | divmodsi4(int modwanted, unsigned long num, unsigned long den) |
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27 | { |
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28 | long int bit = 1; |
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29 | long int res = 0; |
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30 | long prevden; |
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31 | while (den < num && bit && !(den & (1L<<31))) |
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32 | { |
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33 | den <<=1; |
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34 | bit <<=1; |
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35 | } |
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36 | while (bit) |
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37 | { |
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38 | if (num >= den) |
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39 | { |
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40 | num -= den; |
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41 | res |= bit; |
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42 | } |
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43 | bit >>=1; |
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44 | den >>=1; |
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45 | } |
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46 | if (modwanted) return num; |
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47 | return res; |
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48 | } |
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49 | |
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50 | |
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51 | #define exitdiv(sign, res) if (sign) { res = - res;} return res; |
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52 | |
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53 | long |
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54 | __modsi3 (long numerator, long denominator) |
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55 | { |
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56 | int sign = 0; |
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57 | long dividend; |
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58 | long modul; |
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59 | |
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60 | |
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61 | if (numerator < 0) |
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62 | { |
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63 | numerator = -numerator; |
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64 | sign = 1; |
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65 | } |
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66 | if (denominator < 0) |
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67 | { |
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68 | denominator = -denominator; |
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69 | } |
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70 | |
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71 | modul = divmodsi4 (1, numerator, denominator); |
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72 | if (sign) |
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73 | return - modul; |
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74 | return modul; |
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75 | } |
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76 | |
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77 | |
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78 | long |
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79 | __divsi3 (long numerator, long denominator) |
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80 | { |
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81 | int sign; |
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82 | long dividend; |
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83 | long modul; |
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84 | divnorm (numerator, denominator, sign); |
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85 | |
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86 | dividend = divmodsi4 (0, numerator, denominator); |
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87 | exitdiv (sign, dividend); |
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88 | } |
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89 | |
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90 | long |
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91 | __umodsi3 (unsigned long numerator, unsigned long denominator) |
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92 | { |
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93 | long dividend; |
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94 | long modul; |
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95 | |
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96 | modul= divmodsi4 (1, numerator, denominator); |
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97 | return modul; |
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98 | } |
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99 | |
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100 | long |
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101 | __udivsi3 (unsigned long numerator, unsigned long denominator) |
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102 | { |
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103 | int sign; |
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104 | long dividend; |
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105 | long modul; |
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106 | dividend = divmodsi4 (0, numerator, denominator); |
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107 | return dividend; |
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108 | } |
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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 | #ifdef TEST |
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116 | |
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117 | |
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118 | |
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119 | main () |
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120 | { |
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121 | long int i, j, k, m; |
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122 | for (i = -10000; i < 10000; i += 8) |
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123 | { |
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124 | for (j = -10000; j < 10000; j += 11) |
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125 | { |
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126 | k = i / j; |
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127 | m = __divsi3 (i, j); |
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128 | if (k != m) |
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129 | printf ("fail %d %d %d %d\n", i, j, k, m); |
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130 | } |
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131 | } |
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132 | } |
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133 | |
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134 | #endif |
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