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 #include "params/OpDesc.hh"
  36 #include "params/FUDesc.hh"
  37
  38 using namespace std;
  39
  40
  41 ////////////////////////////////////////////////////////////////////////////
  42 //
  43 //  The funciton unit
  44 //
  45 FuncUnit::FuncUnit()
  46 {
  47     capabilityList.reset();
  48 }
  49
  50
  51 //  Copy constructor
  52 FuncUnit::FuncUnit(const FuncUnit &fu)
  53 {
  54
  55     for (int i = 0; i < Num_OpClasses; ++i) {
  56         opLatencies[i] = fu.opLatencies[i];
  57         issueLatencies[i] = fu.issueLatencies[i];
  58     }
  59
  60     capabilityList = fu.capabilityList;
  61 }
  62
  63
  64 void
  65 FuncUnit::addCapability(OpClass cap, unsigned oplat, unsigned issuelat)
  66 {
  67     if (issuelat == 0 || oplat == 0)
  68         panic("FuncUnit:  you don't really want a zero-cycle latency do you?");
  69
  70     capabilityList.set(cap);
  71
  72     opLatencies[cap] = oplat;
  73     issueLatencies[cap] = issuelat;
  74 }
  75
  76 bool
  77 FuncUnit::provides(OpClass capability)
  78 {
  79     return capabilityList[capability];
  80 }
  81
  82 bitset<Num_OpClasses>
  83 FuncUnit::capabilities()
  84 {
  85     return capabilityList;
  86 }
  87
  88 unsigned &
  89 FuncUnit::opLatency(OpClass cap)
  90 {
  91     return opLatencies[cap];
  92 }
  93
  94 unsigned
  95 FuncUnit::issueLatency(OpClass capability)
  96 {
  97     return issueLatencies[capability];
  98 }
  99
 100 ////////////////////////////////////////////////////////////////////////////
 101 //
 102 //  The SimObjects we use to get the FU information into the simulator
 103 //
 104 ////////////////////////////////////////////////////////////////////////////
 105
 106 //
 107 //  We use 2 objects to specify this data in the INI file:
 108 //    (1) OpDesc - Describes the operation class & latencies
 109 //                   (multiple OpDesc objects can refer to the same
 110 //                   operation classes)
 111 //    (2) FUDesc - Describes the operations available in the unit &
 112 //                   the number of these units
 113 //
 114 //
 115
 116
 117 //
 118 //  The operation-class description object
 119 //
 120 OpDesc *
 121 OpDescParams::create()
 122 {
 123     return new OpDesc(name, opClass, opLat, issueLat);
 124 }
 125
 126 //
 127 //  The FuDesc object
 128 //
 129 FUDesc *
 130 FUDescParams::create()
 131 {
 132     return new FUDesc(name, opList, count);
 133 }