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/*
* Copyright (c) 2013 Advanced Micro Devices, Inc
* 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.
*
* Author: Derek Hower
*/
#include "mem/ruby/structures/LRUPolicy.hh"
LRUPolicy::LRUPolicy(const Params * p)
: AbstractReplacementPolicy(p)
{
}
LRUPolicy::~LRUPolicy()
{
}
LRUPolicy *
LRUReplacementPolicyParams::create()
{
return new LRUPolicy(this);
}
void
LRUPolicy::touch(int64_t set, int64_t index, Tick time)
{
assert(index >= 0 && index < m_assoc);
assert(set >= 0 && set < m_num_sets);
m_last_ref_ptr[set][index] = time;
}
int64_t
LRUPolicy::getVictim(int64_t set) const
{
Tick time, smallest_time;
int64_t smallest_index = 0;
smallest_time = m_last_ref_ptr[set][0];
for (unsigned i = 0; i < m_assoc; i++) {
time = m_last_ref_ptr[set][i];
if (time < smallest_time) {
smallest_index = i;
smallest_time = time;
}
}
return smallest_index;
}
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