dos/__udivmoddi4.c

   1 #include <stdint.h>
   2
   3 uint64_t __udivmoddi4(uint64_t num, uint64_t den, uint64_t *rem_p)
   4 {
   5   uint64_t quot = 0, qbit = 1;
   6
   7   if ( den == 0 ) {
   8     asm volatile("int $0");
   9     return 0;                   /* If trap returns... */
  10   }
  11
  12   /* Left-justify denominator and count shift */
  13   while ( (int64_t)den >= 0 ) {
  14     den <<= 1;
  15     qbit <<= 1;
  16   }
  17
  18   while ( qbit ) {
  19     if ( den <= num ) {
  20       num -= den;
  21       quot += qbit;
  22     }
  23     den >>= 1;
  24     qbit >>= 1;
  25   }
  26
  27   if ( rem_p )
  28     *rem_p = num;
  29
  30   return quot;
  31 }