369 lines
8.8 KiB
C
369 lines
8.8 KiB
C
/****************************************************************
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* *
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* Copyright 2011 Fidelity Information Services, Inc *
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* *
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* This source code contains the intellectual property *
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* of its copyright holder(s), and is made available *
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* under a license. If you do not know the terms of *
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* the license, please stop and do not read further. *
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* *
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****************************************************************/
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/*-----------------------------------------------------------------------------
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* MurmurHash3 was written by Austin Appleby, and is placed in the public
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* domain. The author hereby disclaims copyright to this source code.
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*
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* Note - The x86 and x64 versions do _not_ produce the same results, as the
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* algorithms are optimized for their respective platforms. You can still
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* compile and run any of them on any platform, but your performance with the
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* non-native version will be less than optimal.
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*
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* This version converted to C for use in GT.M by FIS.
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*-----------------------------------------------------------------------------*/
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#include "mdef.h"
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#include "mmrhash.h"
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/*
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* Since this code is largely third-party, its form is somewhat different than
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* other code in GT.M. This is intentional, at least for the initial version,
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* in order to allow for comparison with the original. This may be cleaned up
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* in future versions, as no revisions to the original public domain code are
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* expected. The original code is hosted at http://code.google.com/p/smhasher/ .
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*
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* Note also that GT.M is currently only using the 32 bit hash function,
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* MurmurHash3_x86_32(). The 128 bit functions are retained for completeness
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* and possible future use.
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*
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*/
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#if 0
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#define FORCE_INLINE __attribute__((always_inline))
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#else
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#define FORCE_INLINE
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#endif
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static uint4 rotl32 ( uint4 x, char r );
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static uint4 fmix ( uint4 h );
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#ifdef GTM64
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static gtm_uint8 rotl64 ( gtm_uint8 x, char r );
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static gtm_uint8 fmix64 ( gtm_uint8 k );
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#endif
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static uint4 rotl32 ( uint4 x, char r )
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{
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return (x << r) | (x >> (32 - r));
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}
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#ifdef GTM64
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static gtm_uint8 rotl64 ( gtm_uint8 x, char r )
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{
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return (x << r) | (x >> (64 - r));
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}
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#endif
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#define ROTL32(x,y) rotl32(x,y)
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#define ROTL64(x,y) rotl64(x,y)
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#define BIG_CONSTANT(x) (x##LLU)
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#define GETBLOCK(p,i) (((const uint4 *)p)[(int)i])
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#ifdef GTM64
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#define GETBLOCK64(p,i) (((const gtm_uint8 *)p)[(int)i])
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#endif
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/*-----------------------------------------------------------------------------
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* Finalization mix - force all bits of a hash block to avalanche */
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static FORCE_INLINE uint4 fmix ( uint4 h )
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{
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h ^= h >> 16;
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h *= 0x85ebca6b;
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h ^= h >> 13;
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h *= 0xc2b2ae35;
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h ^= h >> 16;
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return h;
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}
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/*----------*/
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#ifdef GTM64
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static FORCE_INLINE gtm_uint8 fmix64 ( gtm_uint8 k )
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{
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k ^= k >> 33;
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k *= BIG_CONSTANT(0xff51afd7ed558ccd);
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k ^= k >> 33;
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k *= BIG_CONSTANT(0xc4ceb9fe1a85ec53);
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k ^= k >> 33;
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return k;
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}
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#endif
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/*-----------------------------------------------------------------------------*/
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void MurmurHash3_x86_32 ( const void * key, int len,
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uint4 seed, void * out )
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{
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int i;
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const unsigned char * data = (const unsigned char*)key;
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const unsigned char * tail;
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const uint4 * blocks;
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const int nblocks = len / 4;
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uint4 h1 = seed;
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uint4 c1 = 0xcc9e2d51;
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uint4 c2 = 0x1b873593;
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uint4 k1;
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/*----------
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* body */
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blocks = (const uint4 *)(data + nblocks*4);
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for(i = -nblocks; i; i++)
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{
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k1 = GETBLOCK(blocks,i);
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k1 *= c1;
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k1 = ROTL32(k1,15);
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k1 *= c2;
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h1 ^= k1;
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h1 = ROTL32(h1,13);
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h1 = h1*5+0xe6546b64;
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}
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/*----------
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* tail */
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tail = (const unsigned char*)(data + nblocks*4);
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k1 = 0;
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switch(len & 3)
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{
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case 3: k1 ^= tail[2] << 16;
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case 2: k1 ^= tail[1] << 8;
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case 1: k1 ^= tail[0];
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k1 *= c1; k1 = ROTL32(k1,15); k1 *= c2; h1 ^= k1;
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};
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/*----------
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* finalization */
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h1 ^= len;
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h1 = fmix(h1);
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*(uint4*)out = h1;
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}
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/*-----------------------------------------------------------------------------*/
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void MurmurHash3_x86_128 ( const void * key, const int len,
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uint4 seed, void * out )
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{
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int i;
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const unsigned char * data = (const unsigned char*)key;
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const unsigned char * tail;
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const int nblocks = len / 16;
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uint4 h1 = seed;
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uint4 h2 = seed;
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uint4 h3 = seed;
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uint4 h4 = seed;
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uint4 c1 = 0x239b961b;
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uint4 c2 = 0xab0e9789;
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uint4 c3 = 0x38b34ae5;
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uint4 c4 = 0xa1e38b93;
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uint4 k1;
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uint4 k2;
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uint4 k3;
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uint4 k4;
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/*----------
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* body */
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const uint4 * blocks = (const uint4 *)(data + nblocks*16);
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for(i = -nblocks; i; i++)
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{
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k1 = GETBLOCK(blocks,i*4+0);
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k2 = GETBLOCK(blocks,i*4+1);
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k3 = GETBLOCK(blocks,i*4+2);
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k4 = GETBLOCK(blocks,i*4+3);
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k1 *= c1; k1 = ROTL32(k1,15); k1 *= c2; h1 ^= k1;
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h1 = ROTL32(h1,19); h1 += h2; h1 = h1*5+0x561ccd1b;
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k2 *= c2; k2 = ROTL32(k2,16); k2 *= c3; h2 ^= k2;
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h2 = ROTL32(h2,17); h2 += h3; h2 = h2*5+0x0bcaa747;
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k3 *= c3; k3 = ROTL32(k3,17); k3 *= c4; h3 ^= k3;
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h3 = ROTL32(h3,15); h3 += h4; h3 = h3*5+0x96cd1c35;
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k4 *= c4; k4 = ROTL32(k4,18); k4 *= c1; h4 ^= k4;
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h4 = ROTL32(h4,13); h4 += h1; h4 = h4*5+0x32ac3b17;
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}
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/*----------
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* tail */
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tail = (const unsigned char*)(data + nblocks*16);
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k1 = 0;
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k2 = 0;
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k3 = 0;
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k4 = 0;
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switch(len & 15)
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{
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case 15: k4 ^= tail[14] << 16;
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case 14: k4 ^= tail[13] << 8;
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case 13: k4 ^= tail[12] << 0;
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k4 *= c4; k4 = ROTL32(k4,18); k4 *= c1; h4 ^= k4;
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case 12: k3 ^= tail[11] << 24;
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case 11: k3 ^= tail[10] << 16;
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case 10: k3 ^= tail[ 9] << 8;
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case 9: k3 ^= tail[ 8] << 0;
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k3 *= c3; k3 = ROTL32(k3,17); k3 *= c4; h3 ^= k3;
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case 8: k2 ^= tail[ 7] << 24;
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case 7: k2 ^= tail[ 6] << 16;
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case 6: k2 ^= tail[ 5] << 8;
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case 5: k2 ^= tail[ 4] << 0;
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k2 *= c2; k2 = ROTL32(k2,16); k2 *= c3; h2 ^= k2;
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case 4: k1 ^= tail[ 3] << 24;
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case 3: k1 ^= tail[ 2] << 16;
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case 2: k1 ^= tail[ 1] << 8;
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case 1: k1 ^= tail[ 0] << 0;
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k1 *= c1; k1 = ROTL32(k1,15); k1 *= c2; h1 ^= k1;
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};
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/*----------
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* finalization */
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h1 ^= len; h2 ^= len; h3 ^= len; h4 ^= len;
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h1 += h2; h1 += h3; h1 += h4;
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h2 += h1; h3 += h1; h4 += h1;
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h1 = fmix(h1);
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h2 = fmix(h2);
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h3 = fmix(h3);
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h4 = fmix(h4);
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h1 += h2; h1 += h3; h1 += h4;
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h2 += h1; h3 += h1; h4 += h1;
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((uint4*)out)[0] = h1;
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((uint4*)out)[1] = h2;
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((uint4*)out)[2] = h3;
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((uint4*)out)[3] = h4;
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}
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/*-----------------------------------------------------------------------------*/
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#ifdef GTM64
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void MurmurHash3_x64_128 ( const void * key, const int len,
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const uint4 seed, void * out )
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{
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int i;
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const unsigned char * data = (const unsigned char*)key;
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const unsigned char * tail;
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const int nblocks = len / 16;
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gtm_uint8 h1 = seed;
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gtm_uint8 h2 = seed;
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gtm_uint8 c1 = BIG_CONSTANT(0x87c37b91114253d5);
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gtm_uint8 c2 = BIG_CONSTANT(0x4cf5ad432745937f);
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gtm_uint8 k1;
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gtm_uint8 k2;
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/*----------
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* body */
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const gtm_uint8 * blocks = (const gtm_uint8 *)(data);
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for(i = 0; i < nblocks; i++)
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{
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k1 = GETBLOCK64(blocks,i*2+0);
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k2 = GETBLOCK64(blocks,i*2+1);
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k1 *= c1; k1 = ROTL64(k1,31); k1 *= c2; h1 ^= k1;
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h1 = ROTL64(h1,27); h1 += h2; h1 = h1*5+0x52dce729;
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k2 *= c2; k2 = ROTL64(k2,33); k2 *= c1; h2 ^= k2;
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h2 = ROTL64(h2,31); h2 += h1; h2 = h2*5+0x38495ab5;
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}
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/*----------
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* tail */
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tail = (const unsigned char*)(data + nblocks*16);
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k1 = 0;
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k2 = 0;
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switch(len & 15)
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{
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case 15: k2 ^= ((gtm_uint8)tail[14]) << 48;
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case 14: k2 ^= ((gtm_uint8)tail[13]) << 40;
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case 13: k2 ^= ((gtm_uint8)tail[12]) << 32;
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case 12: k2 ^= ((gtm_uint8)tail[11]) << 24;
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case 11: k2 ^= ((gtm_uint8)tail[10]) << 16;
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case 10: k2 ^= ((gtm_uint8)tail[ 9]) << 8;
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case 9: k2 ^= ((gtm_uint8)tail[ 8]) << 0;
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k2 *= c2; k2 = ROTL64(k2,33); k2 *= c1; h2 ^= k2;
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case 8: k1 ^= ((gtm_uint8)tail[ 7]) << 56;
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case 7: k1 ^= ((gtm_uint8)tail[ 6]) << 48;
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case 6: k1 ^= ((gtm_uint8)tail[ 5]) << 40;
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case 5: k1 ^= ((gtm_uint8)tail[ 4]) << 32;
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case 4: k1 ^= ((gtm_uint8)tail[ 3]) << 24;
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case 3: k1 ^= ((gtm_uint8)tail[ 2]) << 16;
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case 2: k1 ^= ((gtm_uint8)tail[ 1]) << 8;
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case 1: k1 ^= ((gtm_uint8)tail[ 0]) << 0;
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k1 *= c1; k1 = ROTL64(k1,31); k1 *= c2; h1 ^= k1;
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};
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/*----------
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* finalization */
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h1 ^= len; h2 ^= len;
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h1 += h2;
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h2 += h1;
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h1 = fmix64(h1);
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h2 = fmix64(h2);
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h1 += h2;
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h2 += h1;
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((gtm_uint8*)out)[0] = h1;
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((gtm_uint8*)out)[1] = h2;
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}
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#endif
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/*-----------------------------------------------------------------------------*/
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