45 lines
981 B
C
45 lines
981 B
C
/*
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pointer hash table
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optimized for storing info about particular values
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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#include <limits.h>
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#include "dtypes.h"
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#include "ptrhash.h"
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#define OP_EQ(x, y) ((x) == (y))
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#ifdef BITS64
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static u_int64_t _pinthash(u_int64_t key)
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{
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key = (~key) + (key << 21); // key = (key << 21) - key - 1;
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key = key ^ (key >> 24);
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key = (key + (key << 3)) + (key << 8); // key * 265
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key = key ^ (key >> 14);
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key = (key + (key << 2)) + (key << 4); // key * 21
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key = key ^ (key >> 28);
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key = key + (key << 31);
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return key;
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}
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#else
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static u_int32_t _pinthash(u_int32_t a)
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{
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a = (a + 0x7ed55d16) + (a << 12);
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a = (a ^ 0xc761c23c) ^ (a >> 19);
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a = (a + 0x165667b1) + (a << 5);
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a = (a + 0xd3a2646c) ^ (a << 9);
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a = (a + 0xfd7046c5) + (a << 3);
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a = (a ^ 0xb55a4f09) ^ (a >> 16);
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return a;
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}
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#endif
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#include "htable.inc"
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HTIMPL(ptrhash, _pinthash, OP_EQ)
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