b7c2cd08a6
Change the order in which we extract a/b and c/d to match the output of the upstream xxhash32. Tested with: https://github.com/cota/xxhash/tree/qemu Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Tested-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Emilio G. Cota <cota@braap.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
123 lines
3.5 KiB
C
123 lines
3.5 KiB
C
/*
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* xxHash - Fast Hash algorithm
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* Copyright (C) 2012-2016, Yann Collet
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*
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* BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* + Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* + Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* You can contact the author at :
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* - xxHash source repository : https://github.com/Cyan4973/xxHash
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*/
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#ifndef QEMU_XXHASH_H
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#define QEMU_XXHASH_H
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#include "qemu/bitops.h"
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#define PRIME32_1 2654435761U
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#define PRIME32_2 2246822519U
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#define PRIME32_3 3266489917U
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#define PRIME32_4 668265263U
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#define PRIME32_5 374761393U
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#define QEMU_XXHASH_SEED 1
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/*
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* xxhash32, customized for input variables that are not guaranteed to be
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* contiguous in memory.
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*/
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static inline uint32_t
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qemu_xxhash7(uint64_t ab, uint64_t cd, uint32_t e, uint32_t f, uint32_t g)
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{
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uint32_t v1 = QEMU_XXHASH_SEED + PRIME32_1 + PRIME32_2;
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uint32_t v2 = QEMU_XXHASH_SEED + PRIME32_2;
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uint32_t v3 = QEMU_XXHASH_SEED + 0;
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uint32_t v4 = QEMU_XXHASH_SEED - PRIME32_1;
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uint32_t a = ab;
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uint32_t b = ab >> 32;
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uint32_t c = cd;
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uint32_t d = cd >> 32;
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uint32_t h32;
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v1 += a * PRIME32_2;
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v1 = rol32(v1, 13);
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v1 *= PRIME32_1;
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v2 += b * PRIME32_2;
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v2 = rol32(v2, 13);
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v2 *= PRIME32_1;
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v3 += c * PRIME32_2;
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v3 = rol32(v3, 13);
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v3 *= PRIME32_1;
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v4 += d * PRIME32_2;
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v4 = rol32(v4, 13);
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v4 *= PRIME32_1;
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h32 = rol32(v1, 1) + rol32(v2, 7) + rol32(v3, 12) + rol32(v4, 18);
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h32 += 28;
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h32 += e * PRIME32_3;
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h32 = rol32(h32, 17) * PRIME32_4;
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h32 += f * PRIME32_3;
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h32 = rol32(h32, 17) * PRIME32_4;
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h32 += g * PRIME32_3;
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h32 = rol32(h32, 17) * PRIME32_4;
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h32 ^= h32 >> 15;
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h32 *= PRIME32_2;
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h32 ^= h32 >> 13;
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h32 *= PRIME32_3;
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h32 ^= h32 >> 16;
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return h32;
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}
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static inline uint32_t qemu_xxhash2(uint64_t ab)
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{
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return qemu_xxhash7(ab, 0, 0, 0, 0);
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}
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static inline uint32_t qemu_xxhash4(uint64_t ab, uint64_t cd)
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{
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return qemu_xxhash7(ab, cd, 0, 0, 0);
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}
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static inline uint32_t qemu_xxhash5(uint64_t ab, uint64_t cd, uint32_t e)
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{
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return qemu_xxhash7(ab, cd, e, 0, 0);
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}
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static inline uint32_t qemu_xxhash6(uint64_t ab, uint64_t cd, uint32_t e,
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uint32_t f)
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{
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return qemu_xxhash7(ab, cd, e, f, 0);
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}
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#endif /* QEMU_XXHASH_H */
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