static_inst.cc revision 2632:1bb2f91485ea 
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
29#include <iostream>
30#include "cpu/static_inst.hh"
31#include "sim/root.hh"
32
33StaticInstPtr StaticInst::nullStaticInstPtr;
34
35// Define the decode cache hash map.
36StaticInst::DecodeCache StaticInst::decodeCache;
37
38void
39StaticInst::dumpDecodeCacheStats()
40{
41    using namespace std;
42
43    cerr << "Decode hash table stats @ " << curTick << ":" << endl;
44    cerr << "\tnum entries = " << decodeCache.size() << endl;
45    cerr << "\tnum buckets = " << decodeCache.bucket_count() << endl;
46    vector<int> hist(100, 0);
47    int max_hist = 0;
48    for (int i = 0; i < decodeCache.bucket_count(); ++i) {
49        int count = decodeCache.elems_in_bucket(i);
50        if (count > max_hist)
51            max_hist = count;
52        hist[count]++;
53    }
54    for (int i = 0; i <= max_hist; ++i) {
55        cerr << "\tbuckets of size " << i << " = " << hist[i] << endl;
56    }
57}
58
59bool
60StaticInst::hasBranchTarget(Addr pc, ExecContext *xc, Addr &tgt) const
61{
62    if (isDirectCtrl()) {
63        tgt = branchTarget(pc);
64        return true;
65    }
66
67    if (isIndirectCtrl()) {
68        tgt = branchTarget(xc);
69        return true;
70    }
71
72    return false;
73}
74
75