diff options
Diffstat (limited to 'module/zcommon')
| -rw-r--r-- | module/zcommon/cityhash.c | 33 |
1 files changed, 31 insertions, 2 deletions
diff --git a/module/zcommon/cityhash.c b/module/zcommon/cityhash.c index 413a96df2..c758ec47d 100644 --- a/module/zcommon/cityhash.c +++ b/module/zcommon/cityhash.c @@ -49,8 +49,8 @@ cityhash_helper(uint64_t u, uint64_t v, uint64_t mul) return (b); } -uint64_t -cityhash4(uint64_t w1, uint64_t w2, uint64_t w3, uint64_t w4) +static inline uint64_t +cityhash_impl(uint64_t w1, uint64_t w2, uint64_t w3, uint64_t w4) { uint64_t mul = HASH_K2 + 64; uint64_t a = w1 * HASH_K1; @@ -59,9 +59,38 @@ cityhash4(uint64_t w1, uint64_t w2, uint64_t w3, uint64_t w4) uint64_t d = w3 * HASH_K2; return (cityhash_helper(rotate(a + b, 43) + rotate(c, 30) + d, a + rotate(b + HASH_K2, 18) + c, mul)); +} +/* + * Passing w as the 2nd argument could save one 64-bit multiplication. + */ +uint64_t +cityhash1(uint64_t w) +{ + return (cityhash_impl(0, w, 0, 0)); +} + +uint64_t +cityhash2(uint64_t w1, uint64_t w2) +{ + return (cityhash_impl(w1, w2, 0, 0)); +} + +uint64_t +cityhash3(uint64_t w1, uint64_t w2, uint64_t w3) +{ + return (cityhash_impl(w1, w2, w3, 0)); +} + +uint64_t +cityhash4(uint64_t w1, uint64_t w2, uint64_t w3, uint64_t w4) +{ + return (cityhash_impl(w1, w2, w3, w4)); } #if defined(_KERNEL) +EXPORT_SYMBOL(cityhash1); +EXPORT_SYMBOL(cityhash2); +EXPORT_SYMBOL(cityhash3); EXPORT_SYMBOL(cityhash4); #endif |