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63 lines
2.2 KiB
63 lines
2.2 KiB
4 months ago
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/*
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* Copyright (C) 2019 The Android Open Source Project
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* All rights reserved.
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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
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* are met:
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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 copyright
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* notice, this list of conditions and the following disclaimer in
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* 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
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#pragma once
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#include <stdint.h>
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#include <utility>
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#if defined(__arm__) || defined(__aarch64__)
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#define USE_GNU_HASH_NEON 1
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#else
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#define USE_GNU_HASH_NEON 0
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#endif
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#if USE_GNU_HASH_NEON
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#include "arch/arm_neon/linker_gnu_hash_neon.h"
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#endif
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__attribute__((unused))
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static std::pair<uint32_t, uint32_t> calculate_gnu_hash_simple(const char* name) {
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uint32_t h = 5381;
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const uint8_t* name_bytes = reinterpret_cast<const uint8_t*>(name);
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#pragma unroll 8
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while (*name_bytes != 0) {
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h += (h << 5) + *name_bytes++; // h*33 + c = h + h * 32 + c = h + h << 5 + c
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}
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return { h, reinterpret_cast<const char*>(name_bytes) - name };
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}
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static inline std::pair<uint32_t, uint32_t> calculate_gnu_hash(const char* name) {
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#if USE_GNU_HASH_NEON
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return calculate_gnu_hash_neon(name);
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#else
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return calculate_gnu_hash_simple(name);
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#endif
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}
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