| /* |
| * Copyright (c) 1999-2008 Mark D. Hill and David A. Wood |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer; |
| * redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution; |
| * neither the name of the copyright holders nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "mem/ruby/filters/BlockBloomFilter.hh" |
| |
| #include "base/intmath.hh" |
| #include "base/str.hh" |
| #include "mem/ruby/system/RubySystem.hh" |
| |
| using namespace std; |
| |
| BlockBloomFilter::BlockBloomFilter(int size) |
| { |
| m_filter_size = size; |
| m_filter_size_bits = floorLog2(m_filter_size); |
| |
| m_filter.resize(m_filter_size); |
| |
| clear(); |
| } |
| |
| BlockBloomFilter::~BlockBloomFilter() |
| { |
| } |
| |
| void |
| BlockBloomFilter::clear() |
| { |
| for (int i = 0; i < m_filter_size; i++) { |
| m_filter[i] = 0; |
| } |
| } |
| |
| void |
| BlockBloomFilter::increment(Addr addr) |
| { |
| // Not used |
| } |
| |
| void |
| BlockBloomFilter::decrement(Addr addr) |
| { |
| // Not used |
| } |
| |
| void |
| BlockBloomFilter::merge(AbstractBloomFilter * other_filter) |
| { |
| // TODO |
| } |
| |
| void |
| BlockBloomFilter::set(Addr addr) |
| { |
| int i = get_index(addr); |
| m_filter[i] = 1; |
| } |
| |
| void |
| BlockBloomFilter::unset(Addr addr) |
| { |
| int i = get_index(addr); |
| m_filter[i] = 0; |
| } |
| |
| bool |
| BlockBloomFilter::isSet(Addr addr) |
| { |
| int i = get_index(addr); |
| return (m_filter[i]); |
| } |
| |
| int |
| BlockBloomFilter::getCount(Addr addr) |
| { |
| return m_filter[get_index(addr)]; |
| } |
| |
| int |
| BlockBloomFilter::getTotalCount() |
| { |
| int count = 0; |
| |
| for (int i = 0; i < m_filter_size; i++) { |
| if (m_filter[i]) { |
| count++; |
| } |
| } |
| return count; |
| } |
| |
| int |
| BlockBloomFilter::getIndex(Addr addr) |
| { |
| return get_index(addr); |
| } |
| |
| void |
| BlockBloomFilter::print(ostream& out) const |
| { |
| } |
| |
| int |
| BlockBloomFilter::readBit(const int index) |
| { |
| return m_filter[index]; |
| } |
| |
| void |
| BlockBloomFilter::writeBit(const int index, const int value) |
| { |
| m_filter[index] = value; |
| } |
| |
| int |
| BlockBloomFilter::get_index(Addr addr) |
| { |
| // Pull out some bit field ==> B1 |
| // Pull out additional bits, not the same as B1 ==> B2 |
| // XOR B1 and B2 to get hash index |
| Addr block_bits = bitSelect(addr, RubySystem::getBlockSizeBits(), |
| 2 * RubySystem::getBlockSizeBits() - 1); |
| int offset = 5; |
| Addr other_bits = bitSelect(addr, |
| 2 * RubySystem::getBlockSizeBits() + offset, |
| 2 * RubySystem::getBlockSizeBits() + offset + |
| m_filter_size_bits - 1); |
| int index = block_bits ^ other_bits; |
| assert(index < m_filter_size); |
| return index; |
| } |
| |
| |