src/cpu/func_unit.cc

   1 /*
   2  * Copyright (c) 2002-2006 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: Steve Raasch
  29  */
  30
  31 #include <sstream>
  32
  33 #include "base/misc.hh"
  34 #include "cpu/func_unit.hh"
  35
  36 using namespace std;
  37
  38
  39 ////////////////////////////////////////////////////////////////////////////
  40 //
  41 //  The funciton unit
  42 //
  43 FuncUnit::FuncUnit()
  44 {
  45     capabilityList.reset();
  46 }
  47
  48
  49 //  Copy constructor
  50 FuncUnit::FuncUnit(const FuncUnit &fu)
  51 {
  52
  53     for (int i = 0; i < Num_OpClasses; ++i) {
  54         opLatencies[i] = fu.opLatencies[i];
  55         pipelined[i] = fu.pipelined[i];
  56     }
  57
  58     capabilityList = fu.capabilityList;
  59 }
  60
  61
  62 void
  63 FuncUnit::addCapability(OpClass cap, unsigned oplat, bool pipeline)
  64 {
  65     if (oplat == 0)
  66         panic("FuncUnit:  you don't really want a zero-cycle latency do you?");
  67
  68     capabilityList.set(cap);
  69
  70     opLatencies[cap] = oplat;
  71     pipelined[cap] = pipeline;
  72 }
  73
  74 bool
  75 FuncUnit::provides(OpClass capability)
  76 {
  77     return capabilityList[capability];
  78 }
  79
  80 bitset<Num_OpClasses>
  81 FuncUnit::capabilities()
  82 {
  83     return capabilityList;
  84 }
  85
  86 unsigned &
  87 FuncUnit::opLatency(OpClass cap)
  88 {
  89     return opLatencies[cap];
  90 }
  91
  92 bool
  93 FuncUnit::isPipelined(OpClass capability)
  94 {
  95     return pipelined[capability];
  96 }
  97
  98 ////////////////////////////////////////////////////////////////////////////
  99 //
 100 //  The SimObjects we use to get the FU information into the simulator
 101 //
 102 ////////////////////////////////////////////////////////////////////////////
 103
 104 //
 105 //  We use 2 objects to specify this data in the INI file:
 106 //    (1) OpDesc - Describes the operation class & latencies
 107 //                   (multiple OpDesc objects can refer to the same
 108 //                   operation classes)
 109 //    (2) FUDesc - Describes the operations available in the unit &
 110 //                   the number of these units
 111 //
 112 //
 113
 114
 115 //
 116 //  The operation-class description object
 117 //
 118 OpDesc *
 119 OpDescParams::create()
 120 {
 121     return new OpDesc(this);
 122 }
 123
 124 //
 125 //  The FuDesc object
 126 //
 127 FUDesc *
 128 FUDescParams::create()
 129 {
 130     return new FUDesc(this);
 131 }