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AK: Remove unused rehash_for_collision

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Jelle Raaijmakers 2023-02-14 01:35:10 +01:00 committed by Andrew Kaster
parent c08d137fcd
commit 4cd3a84c4b
Notes: sideshowbarker 2024-07-17 06:51:10 +09:00 
Author: https://github.com/gmta
Commit: https://github.com/SerenityOS/serenity/commit/4cd3a84c4b
Pull-request: https://github.com/SerenityOS/serenity/pull/17472
Reviewed-by: https://github.com/Hendiadyoin1
Reviewed-by: https://github.com/davidot ✅
2 changed files with 0 additions and 21 deletions
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14
AK/HashFunctions.h
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@ -19,20 +19,6 @@ constexpr unsigned int_hash(u32 key)
return key; return key;
} }
constexpr unsigned rehash_for_collision(u32 key)
{
unsigned const magic = 0xBA5EDB01;
if (key == magic)
return 0u;
if (key == 0u)
key = magic;
key ^= key << 13;
key ^= key >> 17;
key ^= key << 5;
return key;
}
constexpr unsigned pair_int_hash(u32 key1, u32 key2) constexpr unsigned pair_int_hash(u32 key1, u32 key2)
{ {
return int_hash((int_hash(key1) * 209) ^ (int_hash(key2 * 413))); return int_hash((int_hash(key1) * 209) ^ (int_hash(key2 * 413)));

7
Tests/AK/TestHashFunctions.cpp
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@ -15,13 +15,6 @@ TEST_CASE(int_hash)
static_assert(int_hash(0) == 1177991625u); static_assert(int_hash(0) == 1177991625u);
} }
TEST_CASE(rehash_for_collision)
{
static_assert(rehash_for_collision(666) == 171644115u);
static_assert(rehash_for_collision(0) == 1189591134u);
static_assert(rehash_for_collision(0xBA5EDB01) == 0u);
}
TEST_CASE(pair_int_hash) TEST_CASE(pair_int_hash)
{ {
static_assert(pair_int_hash(42, 17) == 339337046u); static_assert(pair_int_hash(42, 17) == 339337046u);