lunaix-os/arch/x86/includes/sys/muldiv64.h

   1 #ifndef __LUNAIX_MULDIV64_H
   2 #define __LUNAIX_MULDIV64_H
   3
   4 #include <lunaix/spike.h>
   5 #include <lunaix/types.h>
   6
   7 #ifdef CONFIG_ARCH_I386
   8 #define do_udiv64(n, base)                                                     \
   9     ({                                                                         \
  10         unsigned long __upper, __low, __high, __mod, __base;                   \
  11         __base = (base);                                                       \
  12         if (__builtin_constant_p(__base) && is_pot(__base)) {                  \
  13             __mod = n & (__base - 1);                                          \
  14             n >>= ILOG2(__base);                                               \
  15         } else {                                                               \
  16             asm("" : "=a"(__low), "=d"(__high) : "A"(n));                      \
  17             __upper = __high;                                                  \
  18             if (__high) {                                                      \
  19                 __upper = __high % (__base);                                   \
  20                 __high = __high / (__base);                                    \
  21             }                                                                  \
  22             asm("divl %2"                                                      \
  23                 : "=a"(__low), "=d"(__mod)                                     \
  24                 : "rm"(__base), "0"(__low), "1"(__upper));                     \
  25             asm("" : "=A"(n) : "a"(__low), "d"(__high));                       \
  26         }                                                                      \
  27         __mod;                                                                 \
  28     })
  29 #else
  30     #define do_udiv64(n, base)  \
  31         ({                      \
  32             n = (n) / (base);   \
  33             (n) % (base);       \
  34         })
  35 #endif
  36
  37 static inline u64_t
  38 udiv64(u64_t n, unsigned int base)
  39 {
  40     do_udiv64(n, base);
  41
  42     return n;
  43 }
  44
  45 static inline unsigned int
  46 umod64(u64_t n, unsigned int base)
  47 {
  48     return do_udiv64(n, base);
  49 }
  50
  51 #endif /* __LUNAIX_MULDIV64_H */