From b00d4cd3cc0e70e90f50a8fed294754a4c6e9475 Mon Sep 17 00:00:00 2001 From: Vsevolod Stakhov Date: Thu, 12 May 2016 12:45:17 +0100 Subject: [Feature] Use metrohash as well --- contrib/metrohash/metro.h | 141 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 141 insertions(+) create mode 100644 contrib/metrohash/metro.h (limited to 'contrib') diff --git a/contrib/metrohash/metro.h b/contrib/metrohash/metro.h new file mode 100644 index 000000000..36c44d65c --- /dev/null +++ b/contrib/metrohash/metro.h @@ -0,0 +1,141 @@ +/*- +The MIT License (MIT) + +Copyright (c) 2015 J. Andrew Rogers + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. + */ +#ifndef CONTRIB_METROHASH_METRO_H_ +#define CONTRIB_METROHASH_METRO_H_ + +#include +#include +#include +#include +#ifdef _MSC_VER +typedef unsigned __int32 uint32_t; +typedef unsigned __int64 uint64_t; +#else +#include +#endif + +/* rotate right idiom recognized by compiler*/ +inline static uint64_t rotate_right(uint64_t v, unsigned k) +{ + return (v >> k) | (v << (64 - k)); +} + +inline static uint64_t read_u64(const void * const ptr) +{ + return * (uint64_t *) ptr; +} + +inline static uint64_t read_u32(const void * const ptr) +{ + return * (uint32_t *) ptr; +} + +inline static uint64_t read_u16(const void * const ptr) +{ + return * (uint16_t *) ptr; +} + +inline static uint64_t read_u8 (const void * const ptr) +{ + return * (uint8_t *) ptr; +} + +static inline uint64_t metrohash64_1(const uint8_t * key, uint64_t len, uint64_t seed) +{ + static const uint64_t k0 = 0xC83A91E1; + static const uint64_t k1 = 0x8648DBDB; + static const uint64_t k2 = 0x7BDEC03B; + static const uint64_t k3 = 0x2F5870A5; + + const uint8_t * ptr = key; + const uint8_t * const end = ptr + len; + + uint64_t hash = ((((uint64_t) seed) + k2) * k0) + len; + + if (len >= 32) + { + uint64_t v[4]; + v[0] = hash; + v[1] = hash; + v[2] = hash; + v[3] = hash; + + do + { + v[0] += read_u64(ptr) * k0; ptr += 8; v[0] = rotate_right(v[0],29) + v[2]; + v[1] += read_u64(ptr) * k1; ptr += 8; v[1] = rotate_right(v[1],29) + v[3]; + v[2] += read_u64(ptr) * k2; ptr += 8; v[2] = rotate_right(v[2],29) + v[0]; + v[3] += read_u64(ptr) * k3; ptr += 8; v[3] = rotate_right(v[3],29) + v[1]; + } + while (ptr <= (end - 32)); + + v[2] ^= rotate_right(((v[0] + v[3]) * k0) + v[1], 33) * k1; + v[3] ^= rotate_right(((v[1] + v[2]) * k1) + v[0], 33) * k0; + v[0] ^= rotate_right(((v[0] + v[2]) * k0) + v[3], 33) * k1; + v[1] ^= rotate_right(((v[1] + v[3]) * k1) + v[2], 33) * k0; + hash += v[0] ^ v[1]; + } + + if ((end - ptr) >= 16) + { + uint64_t v0 = hash + (read_u64(ptr) * k0); ptr += 8; v0 = rotate_right(v0,33) * k1; + uint64_t v1 = hash + (read_u64(ptr) * k1); ptr += 8; v1 = rotate_right(v1,33) * k2; + v0 ^= rotate_right(v0 * k0, 35) + v1; + v1 ^= rotate_right(v1 * k3, 35) + v0; + hash += v1; + } + + if ((end - ptr) >= 8) + { + hash += read_u64(ptr) * k3; ptr += 8; + hash ^= rotate_right(hash, 33) * k1; + + } + + if ((end - ptr) >= 4) + { + hash += read_u32(ptr) * k3; ptr += 4; + hash ^= rotate_right(hash, 15) * k1; + } + + if ((end - ptr) >= 2) + { + hash += read_u16(ptr) * k3; ptr += 2; + hash ^= rotate_right(hash, 13) * k1; + } + + if ((end - ptr) >= 1) + { + hash += read_u8 (ptr) * k3; + hash ^= rotate_right(hash, 25) * k1; + } + + hash ^= rotate_right(hash, 33); + hash *= k0; + hash ^= rotate_right(hash, 33); + + return hash; +} + +#endif /* CONTRIB_METROHASH_METRO_H_ */ -- cgit v1.2.3