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032f8807f7
Reviewed-by: Eric Anholt <eric@anholt.net> Reviewed-by: Iago Toral Quiroga <itoral@igalia.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3475>
61 lines
2 KiB
C
61 lines
2 KiB
C
/*
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* Copyright © 2009,2012 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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* Authors:
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* Eric Anholt <eric@anholt.net>
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*
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*/
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#ifndef _FNV1A_H
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#define _FNV1A_H
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enum {
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_mesa_fnv32_1a_offset_bias = 2166136261u,
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};
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/**
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* Quick FNV-1a hash implementation based on:
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* http://www.isthe.com/chongo/tech/comp/fnv/
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*
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* FNV-1a is not be the best hash out there -- Jenkins's lookup3 is supposed
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* to be quite good, and it probably beats FNV. But FNV has the advantage
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* that it involves almost no code. For an improvement on both, see Paul
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* Hsieh's http://www.azillionmonkeys.com/qed/hash.html
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*/
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static inline uint32_t
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_mesa_fnv32_1a_accumulate_block(uint32_t hash, const void *data, size_t size)
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{
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const uint8_t *bytes = (const uint8_t *)data;
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while (size-- != 0) {
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hash ^= *bytes;
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hash = hash * 0x01000193;
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bytes++;
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}
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return hash;
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}
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#define _mesa_fnv32_1a_accumulate(hash, expr) \
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_mesa_fnv32_1a_accumulate_block(hash, &(expr), sizeof(expr))
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#endif
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