include/asm-i386/div64.h

   1 #ifndef __I386_DIV64
   2 #define __I386_DIV64
   3
   4 #define do_div(n,base) ({ \
   5         unsigned long __upper, __low, __high, __mod; \
   6         asm("":"=a" (__low), "=d" (__high):"A" (n)); \
   7         __upper = __high; \
   8         if (__high) { \
   9                 __upper = __high % (base); \
  10                 __high = __high / (base); \
  11         } \
  12         asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (base), "0" (__low), "1" (__upper)); \
  13         asm("":"=A" (n):"a" (__low),"d" (__high)); \
  14         __mod; \
  15 })
  16
  17 /*
  18  * (long)X = ((long long)divs) / (long)div
  19  * (long)rem = ((long long)divs) % (long)div
  20  *
  21  * Warning, this will do an exception if X overflows.
  22  */
  23 #define div_long_long_rem(a,b,c) div_ll_X_l_rem(a,b,c)
  24
  25 extern inline long
  26 div_ll_X_l_rem(long long divs, long div, long *rem)
  27 {
  28         long dum2;
  29       __asm__("divl %2":"=a"(dum2), "=d"(*rem)
  30       : "rm"(div), "A"(divs));
  31
  32         return dum2;
  33
  34 }
  35 #endif