src/cpu/o3/deriv.cc

   1 /*
   2  * Copyright (c) 2004-2006 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: Kevin Lim
  29  */
  30
  31 #include <string>
  32
  33 #include "cpu/o3/deriv.hh"
  34 #include "params/DerivO3CPU.hh"
  35
  36 DerivO3CPU *
  37 DerivO3CPUParams::create()
  38 {
  39     ThreadID actual_num_threads;
  40     if (FullSystem) {
  41         // Full-system only supports a single thread for the moment.
  42         actual_num_threads = 1;
  43     } else {
  44         if (workload.size() > numThreads) {
  45             fatal("Workload Size (%i) > Max Supported Threads (%i) on This CPU",
  46                   workload.size(), numThreads);
  47         } else if (workload.size() == 0) {
  48             fatal("Must specify at least one workload!");
  49         }
  50
  51         // In non-full-system mode, we infer the number of threads from
  52         // the workload if it's not explicitly specified.
  53         actual_num_threads =
  54             (numThreads >= workload.size()) ? numThreads : workload.size();
  55     }
  56
  57     numThreads = actual_num_threads;
  58
  59     // Default smtFetchPolicy to "RoundRobin", if necessary.
  60     std::string round_robin_policy = "RoundRobin";
  61     std::string single_thread = "SingleThread";
  62
  63     if (actual_num_threads > 1 && single_thread.compare(smtFetchPolicy) == 0)
  64         smtFetchPolicy = round_robin_policy;
  65     else
  66         smtFetchPolicy = smtFetchPolicy;
  67
  68     instShiftAmt = 2;
  69
  70     return new DerivO3CPU(this);
  71 }