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Experiments with hashing.

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This commit is contained in:
Alan Mishchenko
2017-04-08 18:37:32 -07:00
parent dd51c29934
commit fe3d334151
6 changed files with 83 additions and 2 deletions
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src/misc/vec/vecHsh.h
+18 -1
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@@ -140,7 +140,24 @@ static inline int Hsh_IntManEntryNum( Hsh_IntMan_t * p )
SeeAlso []
***********************************************************************/
static inline int Hsh_IntManHash( unsigned * pData, int nSize, int nTableSize )
// https://en.wikipedia.org/wiki/Jenkins_hash_function
static inline int Hsh_IntManHash( unsigned * pData, int nSize, int nTableSize )
{
int i = 0; unsigned hash = 0;
unsigned char * pDataC = (unsigned char *)pData;
nSize <<= 2;
while ( i != nSize )
{
hash += pDataC[i++];
hash += hash << 10;
hash ^= hash >> 6;
}
hash += hash << 3;
hash ^= hash >> 11;
hash += hash << 15;
return (int)(hash % nTableSize);
}
static inline int Hsh_IntManHash2( unsigned * pData, int nSize, int nTableSize )
{
static int s_Primes[7] = { 4177, 5147, 5647, 6343, 7103, 7873, 8147 };
unsigned char * pDataC = (unsigned char *)pData;