root / int128.h @ 4115852b
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#ifndef INT128_H
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#define INT128_H
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typedef struct Int128 Int128; |
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struct Int128 {
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uint64_t lo; |
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int64_t hi; |
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}; |
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static inline Int128 int128_make64(uint64_t a) |
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{
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return (Int128) { a, 0 }; |
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} |
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static inline uint64_t int128_get64(Int128 a) |
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{
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assert(!a.hi); |
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return a.lo;
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} |
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static inline Int128 int128_zero(void) |
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{
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return int128_make64(0); |
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} |
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static inline Int128 int128_one(void) |
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{
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return int128_make64(1); |
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} |
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static inline Int128 int128_2_64(void) |
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{
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return (Int128) { 0, 1 }; |
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} |
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static inline Int128 int128_add(Int128 a, Int128 b) |
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{
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Int128 r = { a.lo + b.lo, a.hi + b.hi };
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r.hi += (r.lo < a.lo) || (r.lo < b.lo); |
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return r;
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} |
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static inline Int128 int128_neg(Int128 a) |
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{
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a.lo = ~a.lo; |
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a.hi = ~a.hi; |
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return int128_add(a, int128_one());
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} |
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static inline Int128 int128_sub(Int128 a, Int128 b) |
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{
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return int128_add(a, int128_neg(b));
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} |
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static inline bool int128_nonneg(Int128 a) |
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{
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return a.hi >= 0; |
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} |
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static inline bool int128_eq(Int128 a, Int128 b) |
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{
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return a.lo == b.lo && a.hi == b.hi;
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} |
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static inline bool int128_ne(Int128 a, Int128 b) |
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{
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return !int128_eq(a, b);
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} |
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static inline bool int128_ge(Int128 a, Int128 b) |
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{
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return int128_nonneg(int128_sub(a, b));
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} |
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static inline bool int128_lt(Int128 a, Int128 b) |
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{
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return !int128_ge(a, b);
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} |
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static inline bool int128_le(Int128 a, Int128 b) |
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{
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return int128_ge(b, a);
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} |
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static inline bool int128_gt(Int128 a, Int128 b) |
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{
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return !int128_le(a, b);
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} |
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static inline bool int128_nz(Int128 a) |
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{
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return a.lo || a.hi;
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} |
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static inline Int128 int128_min(Int128 a, Int128 b) |
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{
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return int128_le(a, b) ? a : b;
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} |
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static inline Int128 int128_max(Int128 a, Int128 b) |
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{
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return int128_ge(a, b) ? a : b;
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} |
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static inline void int128_addto(Int128 *a, Int128 b) |
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{
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*a = int128_add(*a, b); |
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} |
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static inline void int128_subfrom(Int128 *a, Int128 b) |
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{
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*a = int128_sub(*a, b); |
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} |
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#endif
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