mirror of https://github.com/proxmox/mirror_qemu
102 lines
3.0 KiB
C
102 lines
3.0 KiB
C
/*
|
|
* xxHash - Fast Hash algorithm
|
|
* Copyright (C) 2012-2016, Yann Collet
|
|
*
|
|
* BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are
|
|
* met:
|
|
*
|
|
* + Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* + Redistributions in binary form must reproduce the above
|
|
* copyright notice, this list of conditions and the following disclaimer
|
|
* in the documentation and/or other materials provided with the
|
|
* distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* You can contact the author at :
|
|
* - xxHash source repository : https://github.com/Cyan4973/xxHash
|
|
*/
|
|
|
|
#ifndef EXEC_TB_HASH_XX_H
|
|
#define EXEC_TB_HASH_XX_H
|
|
|
|
#include "qemu/bitops.h"
|
|
|
|
#define PRIME32_1 2654435761U
|
|
#define PRIME32_2 2246822519U
|
|
#define PRIME32_3 3266489917U
|
|
#define PRIME32_4 668265263U
|
|
#define PRIME32_5 374761393U
|
|
|
|
#define TB_HASH_XX_SEED 1
|
|
|
|
/*
|
|
* xxhash32, customized for input variables that are not guaranteed to be
|
|
* contiguous in memory.
|
|
*/
|
|
static inline uint32_t
|
|
tb_hash_func7(uint64_t a0, uint64_t b0, uint32_t e, uint32_t f, uint32_t g)
|
|
{
|
|
uint32_t v1 = TB_HASH_XX_SEED + PRIME32_1 + PRIME32_2;
|
|
uint32_t v2 = TB_HASH_XX_SEED + PRIME32_2;
|
|
uint32_t v3 = TB_HASH_XX_SEED + 0;
|
|
uint32_t v4 = TB_HASH_XX_SEED - PRIME32_1;
|
|
uint32_t a = a0 >> 32;
|
|
uint32_t b = a0;
|
|
uint32_t c = b0 >> 32;
|
|
uint32_t d = b0;
|
|
uint32_t h32;
|
|
|
|
v1 += a * PRIME32_2;
|
|
v1 = rol32(v1, 13);
|
|
v1 *= PRIME32_1;
|
|
|
|
v2 += b * PRIME32_2;
|
|
v2 = rol32(v2, 13);
|
|
v2 *= PRIME32_1;
|
|
|
|
v3 += c * PRIME32_2;
|
|
v3 = rol32(v3, 13);
|
|
v3 *= PRIME32_1;
|
|
|
|
v4 += d * PRIME32_2;
|
|
v4 = rol32(v4, 13);
|
|
v4 *= PRIME32_1;
|
|
|
|
h32 = rol32(v1, 1) + rol32(v2, 7) + rol32(v3, 12) + rol32(v4, 18);
|
|
h32 += 28;
|
|
|
|
h32 += e * PRIME32_3;
|
|
h32 = rol32(h32, 17) * PRIME32_4;
|
|
|
|
h32 += f * PRIME32_3;
|
|
h32 = rol32(h32, 17) * PRIME32_4;
|
|
|
|
h32 += g * PRIME32_3;
|
|
h32 = rol32(h32, 17) * PRIME32_4;
|
|
|
|
h32 ^= h32 >> 15;
|
|
h32 *= PRIME32_2;
|
|
h32 ^= h32 >> 13;
|
|
h32 *= PRIME32_3;
|
|
h32 ^= h32 >> 16;
|
|
|
|
return h32;
|
|
}
|
|
|
|
#endif /* EXEC_TB_HASH_XX_H */
|