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https://github.com/SerenityOS/serenity
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1682f0b760
SPDX License Identifiers are a more compact / standardized way of representing file license information. See: https://spdx.dev/resources/use/#identifiers This was done with the `ambr` search and replace tool. ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
56 lines
1 KiB
C++
56 lines
1 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Types.h>
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constexpr unsigned int_hash(u32 key)
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{
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key += ~(key << 15);
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key ^= (key >> 10);
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key += (key << 3);
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key ^= (key >> 6);
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key += ~(key << 11);
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key ^= (key >> 16);
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return key;
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}
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constexpr unsigned double_hash(u32 key)
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{
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key = ~key + (key >> 23);
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key ^= (key << 12);
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key ^= (key >> 7);
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key ^= (key << 2);
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key ^= (key >> 20);
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return key;
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}
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constexpr unsigned pair_int_hash(u32 key1, u32 key2)
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{
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return int_hash((int_hash(key1) * 209) ^ (int_hash(key2 * 413)));
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}
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constexpr unsigned u64_hash(u64 key)
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{
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u32 first = key & 0xFFFFFFFF;
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u32 last = key >> 32;
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return pair_int_hash(first, last);
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}
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constexpr unsigned ptr_hash(FlatPtr ptr)
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{
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if constexpr (sizeof(ptr) == 8)
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return u64_hash(ptr);
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else
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return int_hash(ptr);
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}
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inline unsigned ptr_hash(const void* ptr)
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{
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return ptr_hash(FlatPtr(ptr));
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}
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