hashable-1.2.0.0: benchmarks/cbits/inthash.c

#include <stdint.h>

/*
 * 32-bit hashes by Bob Jenkins.
 */

uint32_t hash_jenkins_32a(uint32_t a)
{
    a = (a+0x7ed55d16) + (a<<12);
    a = (a^0xc761c23c) ^ (a>>19);
    a = (a+0x165667b1) + (a<<5);
    a = (a+0xd3a2646c) ^ (a<<9);
    a = (a+0xfd7046c5) + (a<<3);
    a = (a^0xb55a4f09) ^ (a>>16);
    return a;
}

uint32_t hash_jenkins_32b(uint32_t a)
{
    a -= (a<<6);
    a ^= (a>>17);
    a -= (a<<9);
    a ^= (a<<4);
    a -= (a<<3);
    a ^= (a<<10);
    a ^= (a>>15);
    return a;
}