diff options
Diffstat (limited to 'src/zand.c')
| -rw-r--r-- | src/zand.c | 37 |
1 files changed, 19 insertions, 18 deletions
@@ -2,36 +2,37 @@ #include "internals.h" +static inline O2 void +zand_impl(zahl_char_t *restrict a, const zahl_char_t *restrict b, size_t n) +{ + size_t i; + for (i = 0; i < n; i++) + a[i] &= b[i]; +} + void zand(z_t a, z_t b, z_t c) { - size_t n; - - if (unlikely(zzero1(b, c))) { + /* Yes, you are reading this right. It's an optimisation. */ + if (unlikely(zzero(b))) { + SET_SIGNUM(a, 0); + return; + } else if (unlikely(zzero(c))) { SET_SIGNUM(a, 0); return; } - n = MIN(b->used, c->used); - while (n--) - if (b->chars[n] & c->chars[n]) - goto found_highest; - SET_SIGNUM(a, 0); - return; + a->used = MIN(b->used, c->used); -found_highest: - a->used = ++n; if (a == b) { - while (n--) - a->chars[n] &= c->chars[n]; + zand_impl(a->chars, c->chars, a->used); } else if (unlikely(a == c)) { - while (n--) - a->chars[n] &= b->chars[n]; + zand_impl(a->chars, b->chars, a->used); } else { ENSURE_SIZE(a, a->used); zmemcpy(a->chars, c->chars, a->used); - while (n--) - a->chars[n] &= b->chars[n]; + zand_impl(a->chars, b->chars, a->used); } - SET_SIGNUM(a, zpositive1(b, c) * 2 - 1); + + TRIM_AND_SIGN(a, zpositive1(b, c) * 2 - 1); } |