adding initial project layout
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src/common/src/hash.cpp
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241
src/common/src/hash.cpp
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/**
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* Copyright (C) 2005-2012 Gekko Emulator
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*
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* @file hash.cpp
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* @author ShizZy <shizzy247@gmail.com>
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* @date 2012-12-05
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* @brief General purpose hash function
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* @remark Some functions borrowed from Dolphin Emulator
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*
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* @section LICENSE
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details at
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* http://www.gnu.org/copyleft/gpl.html
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*
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* Official project repository can be found at:
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* http://code.google.com/p/gekko-gc-emu/
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*/
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#include "crc.h"
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#include "hash.h"
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#include "common.h"
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namespace common {
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/// Block mix - combine the key bits with the hash bits and scramble everything
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inline void bmix64(u64& h1, u64& h2, u64& k1, u64& k2, u64& c1, u64& c2) {
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k1 *= c1;
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k1 = _rotl64(k1,23);
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k1 *= c2;
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h1 ^= k1;
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h1 += h2;
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h2 = _rotl64(h2,41);
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k2 *= c2;
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k2 = _rotl64(k2,23);
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k2 *= c1;
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h2 ^= k2;
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h2 += h1;
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h1 = h1*3 + 0x52dce729;
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h2 = h2*3 + 0x38495ab5;
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c1 = c1*5 + 0x7b7d159c;
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c2 = c2*5 + 0x6bce6396;
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}
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/// Finalization mix - avalanches all bits to within 0.05% bias
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inline u64 fmix64(u64 k) {
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k ^= k >> 33;
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k *= 0xff51afd7ed558ccd;
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k ^= k >> 33;
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k *= 0xc4ceb9fe1a85ec53;
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k ^= k >> 33;
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return k;
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}
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#define ROTL32(x,y) rotl32(x,y)
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inline uint32_t fmix ( uint32_t 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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u32 __compute_murmur_hash3_32(const u8 *src, int len, u32 samples) {
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u32 h = len;
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u32 step = (len >> 2);
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const u32 *data = (const u32*)src;
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const u32 *end = data + step;
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if (samples == 0) {
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samples = std::max(step, 1u);
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}
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step = step / samples;
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if(step < 1) {
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step = 1;
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}
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u32 h1 = 0x2f6af274;
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const u32 c1 = 0xcc9e2d51;
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const u32 c2 = 0x1b873593;
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while (data < end) {
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u32 k1 = data[0];
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k1 *= c1;
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k1 = (k1 << 15) | (k1 >> (32 - 15));
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k1 *= c2;
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h1 ^= k1;
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h1 = (h1 << 15) | (h1 >> (32 - 13));
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h1 = h1*5+0xe6546b64;
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data += step;
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}
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const u8 * tail = (const u8*)(data);
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u32 k1 = 0;
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switch(len & 3) {
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case 3:
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k1 ^= tail[2] << 16;
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case 2:
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k1 ^= tail[1] << 8;
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case 1:
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k1 ^= tail[0];
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k1 *= c1;
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k1 = (k1 << 15) | (k1 >> (32 - 15));
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k1 *= c2;
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h1 ^= k1;
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};
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h1 ^= len;
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h1 = fmix(h1);
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return h1;
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}
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/// MurmurHash is a non-cryptographic hash function suitable for general hash-based lookup
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u64 __compute_murmur_hash3_64(const u8 *src, int len, u32 samples) {
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const u8 * data = (const u8*)src;
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const int nblocks = len / 16;
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u32 step = (len / 8);
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if(samples == 0) {
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samples = std::max(step, 1u);
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}
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step = step / samples;
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if(step < 1) {
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step = 1;
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}
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u64 h1 = 0x9368e53c2f6af274;
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u64 h2 = 0x586dcd208f7cd3fd;
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u64 c1 = 0x87c37b91114253d5;
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u64 c2 = 0x4cf5ad432745937f;
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const u64* blocks = (const u64*)(data);
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for (int i = 0; i < nblocks; i+=step) {
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u64 k1 = blocks[(i * 2) + 0];
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u64 k2 = blocks[(i * 2) + 1];
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bmix64(h1,h2,k1,k2,c1,c2);
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}
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const u8* tail = (const u8*)(data + nblocks * 16);
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u64 k1 = 0;
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u64 k2 = 0;
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switch (len & 15) {
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case 15: k2 ^= u64(tail[14]) << 48;
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case 14: k2 ^= u64(tail[13]) << 40;
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case 13: k2 ^= u64(tail[12]) << 32;
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case 12: k2 ^= u64(tail[11]) << 24;
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case 11: k2 ^= u64(tail[10]) << 16;
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case 10: k2 ^= u64(tail[ 9]) << 8;
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case 9: k2 ^= u64(tail[ 8]) << 0;
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case 8: k1 ^= u64(tail[ 7]) << 56;
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case 7: k1 ^= u64(tail[ 6]) << 48;
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case 6: k1 ^= u64(tail[ 5]) << 40;
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case 5: k1 ^= u64(tail[ 4]) << 32;
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case 4: k1 ^= u64(tail[ 3]) << 24;
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case 3: k1 ^= u64(tail[ 2]) << 16;
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case 2: k1 ^= u64(tail[ 1]) << 8;
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case 1: k1 ^= u64(tail[ 0]) << 0;
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bmix64(h1, h2, k1, k2, c1, c2);
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};
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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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return h1;
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}
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/// CRC32 hash using the SSE4.2 instruction
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u64 __compute_crc32_sse4(const u8 *src, int len, u32 samples) {
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u32 h = len;
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u32 step = (len >> 2);
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const u32 *data = (const u32*)src;
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const u32 *end = data + step;
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if (samples == 0) {
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samples = std::max(step, 1u);
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}
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step = step / samples;
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if(step < 1) {
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step = 1;
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}
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while (data < end) {
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h = InlineCrc32_U32(h, data[0]);
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data += step;
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}
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const u8 *data2 = (const u8*)end;
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return (u64)InlineCrc32_U32(h, u32(data2[0]));
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}
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/**
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* Compute an efficient 64-bit hash (optimized for Intel hardware)
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* @param src Source data buffer to compute hash for
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* @param len Length of data buffer to compute hash for
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* @param samples Number of samples to compute hash for
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* @remark Borrowed from Dolphin Emulator
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*/
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Hash64 GetHash64(const u8 *src, int len, u32 samples) {
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#if defined(EMU_ARCHITECTURE_X86) || defined(EMU_ARCHITECTURE_X64)
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// TODO(ShizZy): Move somewhere common so we dont need to instantiate this more than once
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static X86Utils x86_utils;
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if (x86_utils.IsExtensionSupported(X86Utils::kExtensionX86_SSE4_2)) {
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return __compute_crc32_sse4(src, len, samples);
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} else {
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#ifdef EMU_ARCHITECTURE_X64
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return __compute_murmur_hash3_64(src, len, samples);
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#else
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return __compute_murmur_hash3_32(src, len, samples);
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#endif
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}
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#else
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return __compute_murmur_hash3_32(src, len, samples);
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#endif
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}
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} // namespace
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