static_inst.cc

来自「M5,一个功能强大的多处理器系统模拟器.很多针对处理器架构,性能的研究都使用它作」· CC 代码 · 共 87 行

/*
 * Copyright (c) 2003, 2004, 2005
 * The Regents of The University of Michigan
 * All Rights Reserved
 *
 * This code is part of the M5 simulator.
 *
 * Permission is granted to use, copy, create derivative works and
 * redistribute this software and such derivative works for any
 * purpose, so long as the copyright notice above, this grant of
 * permission, and the disclaimer below appear in all copies made; and
 * so long as the name of The University of Michigan is not used in
 * any advertising or publicity pertaining to the use or distribution
 * of this software without specific, written prior authorization.
 *
 * THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION FROM THE
 * UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY PURPOSE, AND
 * WITHOUT WARRANTY BY THE UNIVERSITY OF MICHIGAN OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE. THE REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL NOT BE
 * LIABLE FOR ANY DAMAGES, INCLUDING DIRECT, SPECIAL, INDIRECT,
 * INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY CLAIM
 * ARISING OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE, EVEN
 * IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGES.
 *
 * Authors: Steven K. Reinhardt
 *          Nathan L. Binkert
 */

#include <iostream>
#include "cpu/static_inst.hh"
#include "sim/core.hh"

StaticInstPtr StaticInst::nullStaticInstPtr;

// Define the decode cache hash map.
StaticInst::DecodeCache StaticInst::decodeCache;
StaticInst::AddrDecodeCache StaticInst::addrDecodeCache;
StaticInst::cacheElement StaticInst::recentDecodes[2];

void
StaticInst::dumpDecodeCacheStats()
{
    using namespace std;

    cerr << "Decode hash table stats @ " << curTick << ":" << endl;
    cerr << "\tnum entries = " << decodeCache.size() << endl;
    cerr << "\tnum buckets = " << decodeCache.bucket_count() << endl;
    vector<int> hist(100, 0);
    int max_hist = 0;
    for (int i = 0; i < decodeCache.bucket_count(); ++i) {
        int count = decodeCache.elems_in_bucket(i);
        if (count > max_hist)
            max_hist = count;
        hist[count]++;
    }
    for (int i = 0; i <= max_hist; ++i) {
        cerr << "\tbuckets of size " << i << " = " << hist[i] << endl;
    }
}

bool
StaticInst::hasBranchTarget(Addr pc, ThreadContext *tc, Addr &tgt) const
{
    if (isDirectCtrl()) {
        tgt = branchTarget(pc);
        return true;
    }

    if (isIndirectCtrl()) {
        tgt = branchTarget(tc);
        return true;
    }

    return false;
}

StaticInstPtr
StaticInst::fetchMicroop(MicroPC micropc)
{
    panic("StaticInst::fetchMicroop() called on instruction "
            "that is not microcoded.");
}