cpu/static_inst.cc

   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
  33 StaticInstPtr StaticInst::nullStaticInstPtr;
  34
  35 // Define the decode cache hash map.
  36 StaticInst::DecodeCache StaticInst::decodeCache;
  37
  38 void
  39 StaticInst::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
  59 bool
  60 StaticInst::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