mirror of
https://github.com/autc04/Retro68.git
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135 lines
2.0 KiB
C
135 lines
2.0 KiB
C
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#define divnorm(num, den, sign) \
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{ \
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if (num < 0) \
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{ \
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num = -num; \
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sign = 1; \
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} \
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else \
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{ \
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sign = 0; \
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} \
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\
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if (den < 0) \
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{ \
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den = - den; \
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sign = 1 - sign; \
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} \
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}
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unsigned long
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divmodsi4(int modwanted, unsigned long num, unsigned long den)
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{
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long int bit = 1;
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long int res = 0;
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long prevden;
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while (den < num && bit && !(den & (1L<<31)))
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{
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den <<=1;
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bit <<=1;
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}
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while (bit)
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{
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if (num >= den)
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{
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num -= den;
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res |= bit;
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}
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bit >>=1;
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den >>=1;
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}
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if (modwanted) return num;
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return res;
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}
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#define exitdiv(sign, res) if (sign) { res = - res;} return res;
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long
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__modsi3 (long numerator, long denominator)
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{
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int sign = 0;
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long dividend;
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long modul;
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if (numerator < 0)
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{
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numerator = -numerator;
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sign = 1;
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}
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if (denominator < 0)
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{
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denominator = -denominator;
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}
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modul = divmodsi4 (1, numerator, denominator);
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if (sign)
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return - modul;
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return modul;
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}
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long
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__divsi3 (long numerator, long denominator)
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{
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int sign;
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long dividend;
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long modul;
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divnorm (numerator, denominator, sign);
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dividend = divmodsi4 (0, numerator, denominator);
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exitdiv (sign, dividend);
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}
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long
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__umodsi3 (unsigned long numerator, unsigned long denominator)
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{
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long dividend;
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long modul;
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modul= divmodsi4 (1, numerator, denominator);
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return modul;
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}
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long
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__udivsi3 (unsigned long numerator, unsigned long denominator)
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{
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int sign;
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long dividend;
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long modul;
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dividend = divmodsi4 (0, numerator, denominator);
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return dividend;
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}
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#ifdef TEST
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main ()
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{
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long int i, j, k, m;
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for (i = -10000; i < 10000; i += 8)
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{
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for (j = -10000; j < 10000; j += 11)
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{
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k = i / j;
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m = __divsi3 (i, j);
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if (k != m)
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printf ("fail %d %d %d %d\n", i, j, k, m);
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}
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}
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}
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#endif
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