include/asm-m32r/div64.h

   1 #ifndef _ASM_M32R_DIV64
   2 #define _ASM_M32R_DIV64
   3
   4 /* $Id$ */
   5
   6 /* unsigned long long division.
   7  * Input:
   8  *  unsigned long long  n
   9  *  unsigned long  base
  10  * Output:
  11  *  n = n / base;
  12  *  return value = n % base;
  13  */
  14 #define do_div(n, base)                                         \
  15 ({                                                              \
  16         unsigned long _res, _high, _mid, _low;                  \
  17                                                                 \
  18         _low = (n) & 0xffffffffUL;                              \
  19         _high = (n) >> 32;                                      \
  20         if (_high) {                                            \
  21                 _mid = (_high % (unsigned long)(base)) << 16;   \
  22                 _high = _high / (unsigned long)(base);          \
  23                 _mid += _low >> 16;                             \
  24                 _low &= 0x0000ffffUL;                           \
  25                 _low += (_mid % (unsigned long)(base)) << 16;   \
  26                 _mid = _mid / (unsigned long)(base);            \
  27                 _res = _low % (unsigned long)(base);            \
  28                 _low = _low / (unsigned long)(base);            \
  29                 n = _low + ((long long)_mid << 16) +            \
  30                         ((long long)_high << 32);               \
  31         } else {                                                \
  32                 _res = _low % (unsigned long)(base);            \
  33                 n = (_low / (unsigned long)(base));             \
  34         }                                                       \
  35         _res;                                                   \
  36 })
  37
  38 #endif  /* _ASM_M32R_DIV64 */