[444] | 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 | 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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