fifo_rp.cc

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#include "mem/cache/replacement_policies/fifo_rp.hh"

#include <cassert>
#include <memory>

#include "params/FIFORP.hh"

FIFORP::FIFORP(const Params *p)
    : BaseReplacementPolicy(p)
{
}

void
FIFORP::invalidate(const std::shared_ptr<ReplacementData>& replacement_data)
const
{
    // Reset insertion tick
    std::static_pointer_cast<FIFOReplData>(
        replacement_data)->tickInserted = Tick(0);
}

void
FIFORP::touch(const std::shared_ptr<ReplacementData>& replacement_data) const
{
    // A touch does not modify the insertion tick
}

void
FIFORP::reset(const std::shared_ptr<ReplacementData>& replacement_data) const
{
    // Set insertion tick
    std::static_pointer_cast<FIFOReplData>(
        replacement_data)->tickInserted = curTick();
}

ReplaceableEntry*
FIFORP::getVictim(const ReplacementCandidates& candidates) const
{
    // There must be at least one replacement candidate
    assert(candidates.size() > 0);

    // Visit all candidates to find victim
    ReplaceableEntry* victim = candidates[0];
    for (const auto& candidate : candidates) {
        // Update victim entry if necessary
        if (std::static_pointer_cast<FIFOReplData>(
                    candidate->replacementData)->tickInserted <
                std::static_pointer_cast<FIFOReplData>(
                    victim->replacementData)->tickInserted) {
            victim = candidate;
        }
    }

    return victim;
}

std::shared_ptr<ReplacementData>
FIFORP::instantiateEntry()
{
    return std::shared_ptr<ReplacementData>(new FIFOReplData());
}

FIFORP*
FIFORPParams::create()
{
    return new FIFORP(this);
}