bulk_bloom_filter.hh revision 14263:4a6d5c4a0813
1/* 2 * Copyright (c) 2019 Inria 3 * Copyright (c) 1999-2008 Mark D. Hill and David A. Wood 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are 8 * met: redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer; 10 * redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution; 13 * neither the name of the copyright holders nor the names of its 14 * contributors may be used to endorse or promote products derived from 15 * this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 20 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 21 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 23 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * Authors: Daniel Carvalho 30 */ 31 32#ifndef __BASE_FILTERS_BULK_BLOOM_FILTER_HH__ 33#define __BASE_FILTERS_BULK_BLOOM_FILTER_HH__ 34 35#include "base/filters/multi_bit_sel_bloom_filter.hh" 36 37struct BloomFilterBulkParams; 38 39namespace BloomFilter { 40 41/** 42 * Implementation of the bloom filter, as described in "Bulk Disambiguation of 43 * Speculative Threads in Multiprocessors", by Ceze, Luis, et al. 44 * The number of hashes indicates the number of c bitfields. 45 */ 46class Bulk : public MultiBitSel 47{ 48 public: 49 Bulk(const BloomFilterBulkParams* p); 50 ~Bulk(); 51 52 protected: 53 int hash(Addr addr, int hash_number) const override; 54 55 private: 56 /** Permutes the address to generate its signature. */ 57 Addr permute(Addr addr) const; 58 59 /** 60 * Number of bits used per sector. The filter is split into sectors, 61 * each of which with its own hash function. When an address is hashed 62 * all sectors are parsed to generate c indexes. These indexes are then 63 * used to find the respective v indexes in the main filter. 64 */ 65 const int sectorBits; 66}; 67 68} // namespace BloomFilter 69 70#endif // __BASE_FILTERS_BULK_BLOOM_FILTER_HH__ 71