diff options
Diffstat (limited to 'int128.h')
-rw-r--r-- | int128.h | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/int128.h b/int128.h new file mode 100644 index 0000000..b3864b6 --- /dev/null +++ b/int128.h @@ -0,0 +1,116 @@ +#ifndef INT128_H +#define INT128_H + +typedef struct Int128 Int128; + +struct Int128 { + uint64_t lo; + int64_t hi; +}; + +static inline Int128 int128_make64(uint64_t a) +{ + return (Int128) { a, 0 }; +} + +static inline uint64_t int128_get64(Int128 a) +{ + assert(!a.hi); + return a.lo; +} + +static inline Int128 int128_zero(void) +{ + return int128_make64(0); +} + +static inline Int128 int128_one(void) +{ + return int128_make64(1); +} + +static inline Int128 int128_2_64(void) +{ + return (Int128) { 0, 1 }; +} + +static inline Int128 int128_add(Int128 a, Int128 b) +{ + Int128 r = { a.lo + b.lo, a.hi + b.hi }; + r.hi += (r.lo < a.lo) || (r.lo < b.lo); + return r; +} + +static inline Int128 int128_neg(Int128 a) +{ + a.lo = ~a.lo; + a.hi = ~a.hi; + return int128_add(a, int128_one()); +} + +static inline Int128 int128_sub(Int128 a, Int128 b) +{ + return int128_add(a, int128_neg(b)); +} + +static inline bool int128_nonneg(Int128 a) +{ + return a.hi >= 0; +} + +static inline bool int128_eq(Int128 a, Int128 b) +{ + return a.lo == b.lo && a.hi == b.hi; +} + +static inline bool int128_ne(Int128 a, Int128 b) +{ + return !int128_eq(a, b); +} + +static inline bool int128_ge(Int128 a, Int128 b) +{ + return int128_nonneg(int128_sub(a, b)); +} + +static inline bool int128_lt(Int128 a, Int128 b) +{ + return !int128_ge(a, b); +} + +static inline bool int128_le(Int128 a, Int128 b) +{ + return int128_ge(b, a); +} + +static inline bool int128_gt(Int128 a, Int128 b) +{ + return !int128_le(a, b); +} + +static inline bool int128_nz(Int128 a) +{ + return a.lo || a.hi; +} + +static inline Int128 int128_min(Int128 a, Int128 b) +{ + return int128_le(a, b) ? a : b; +} + +static inline Int128 int128_max(Int128 a, Int128 b) +{ + return int128_ge(a, b) ? a : b; +} + +static inline void int128_addto(Int128 *a, Int128 b) +{ + *a = int128_add(*a, b); +} + +static inline void int128_subfrom(Int128 *a, Int128 b) +{ + *a = int128_sub(*a, b); +} + +#endif |