From dc8b295d05ec35a8c032f9abca421772347ba5d4 Mon Sep 17 00:00:00 2001 From: "Emilio G. Cota" Date: Wed, 8 Jun 2016 14:55:24 -0400 Subject: [PATCH] exec: add tb_hash_func5, derived from xxhash This will be used by upcoming changes for hashing the tb hash. Add this into a separate file to include the copyright notice from xxhash. Reviewed-by: Sergey Fedorov Reviewed-by: Richard Henderson Signed-off-by: Emilio G. Cota Message-Id: <1465412133-3029-7-git-send-email-cota@braap.org> Signed-off-by: Richard Henderson --- include/exec/tb-hash-xx.h | 94 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 94 insertions(+) create mode 100644 include/exec/tb-hash-xx.h diff --git a/include/exec/tb-hash-xx.h b/include/exec/tb-hash-xx.h new file mode 100644 index 0000000000..9f3fc05636 --- /dev/null +++ b/include/exec/tb-hash-xx.h @@ -0,0 +1,94 @@ +/* + * 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 +#define EXEC_TB_HASH_XX + +#include + +#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_func5(uint64_t a0, uint64_t b0, uint32_t e) +{ + 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 += 20; + + h32 += e * 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 */ -- 2.11.4.GIT