static_inst.cc revision 4539 
1/*
2 * Copyright (c) 2003-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Steve Reinhardt
29 *          Nathan Binkert
30 */
31
32#include <iostream>
33#include "cpu/static_inst.hh"
34#include "sim/core.hh"
35
36StaticInstPtr StaticInst::nullStaticInstPtr;
37
38// Define the decode cache hash map.
39StaticInst::DecodeCache StaticInst::decodeCache;
40
41void
42StaticInst::dumpDecodeCacheStats()
43{
44    using namespace std;
45
46    cerr << "Decode hash table stats @ " << curTick << ":" << endl;
47    cerr << "\tnum entries = " << decodeCache.size() << endl;
48    cerr << "\tnum buckets = " << decodeCache.bucket_count() << endl;
49    vector<int> hist(100, 0);
50    int max_hist = 0;
51    for (int i = 0; i < decodeCache.bucket_count(); ++i) {
52        int count = decodeCache.elems_in_bucket(i);
53        if (count > max_hist)
54            max_hist = count;
55        hist[count]++;
56    }
57    for (int i = 0; i <= max_hist; ++i) {
58        cerr << "\tbuckets of size " << i << " = " << hist[i] << endl;
59    }
60}
61
62bool
63StaticInst::hasBranchTarget(Addr pc, ThreadContext *tc, Addr &tgt) const
64{
65    if (isDirectCtrl()) {
66        tgt = branchTarget(pc);
67        return true;
68    }
69
70    if (isIndirectCtrl()) {
71        tgt = branchTarget(tc);
72        return true;
73    }
74
75    return false;
76}
77
78StaticInstPtr
79StaticInst::fetchMicroop(MicroPC micropc)
80{
81    panic("StaticInst::fetchMicroop() called on instruction "
82            "that is not microcoded.");
83}
84
85