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 "cpu/func_unit.hh"
  32
  33 #include <sstream>
  34
  35 #include "base/misc.hh"
  36
  37 using namespace std;
  38
  39
  40 ////////////////////////////////////////////////////////////////////////////
  41 //
  42 //  The funciton unit
  43 //
  44 FuncUnit::FuncUnit()
  45 {
  46     opLatencies.fill(0);
  47     pipelined.fill(false);
  48     capabilityList.reset();
  49 }
  50
  51
  52 //  Copy constructor
  53 FuncUnit::FuncUnit(const FuncUnit &fu)
  54 {
  55
  56     for (int i = 0; i < Num_OpClasses; ++i) {
  57         opLatencies[i] = fu.opLatencies[i];
  58         pipelined[i] = fu.pipelined[i];
  59     }
  60
  61     capabilityList = fu.capabilityList;
  62 }
  63
  64
  65 void
  66 FuncUnit::addCapability(OpClass cap, unsigned oplat, bool pipeline)
  67 {
  68     if (oplat == 0)
  69         panic("FuncUnit:  you don't really want a zero-cycle latency do you?");
  70
  71     capabilityList.set(cap);
  72
  73     opLatencies[cap] = oplat;
  74     pipelined[cap] = pipeline;
  75 }
  76
  77 bool
  78 FuncUnit::provides(OpClass capability)
  79 {
  80     return capabilityList[capability];
  81 }
  82
  83 bitset<Num_OpClasses>
  84 FuncUnit::capabilities()
  85 {
  86     return capabilityList;
  87 }
  88
  89 unsigned &
  90 FuncUnit::opLatency(OpClass cap)
  91 {
  92     return opLatencies[cap];
  93 }
  94
  95 bool
  96 FuncUnit::isPipelined(OpClass capability)
  97 {
  98     return pipelined[capability];
  99 }
 100
 101 ////////////////////////////////////////////////////////////////////////////
 102 //
 103 //  The SimObjects we use to get the FU information into the simulator
 104 //
 105 ////////////////////////////////////////////////////////////////////////////
 106
 107 //
 108 //  We use 2 objects to specify this data in the INI file:
 109 //    (1) OpDesc - Describes the operation class & latencies
 110 //                   (multiple OpDesc objects can refer to the same
 111 //                   operation classes)
 112 //    (2) FUDesc - Describes the operations available in the unit &
 113 //                   the number of these units
 114 //
 115 //
 116
 117
 118 //
 119 //  The operation-class description object
 120 //
 121 OpDesc *
 122 OpDescParams::create()
 123 {
 124     return new OpDesc(this);
 125 }
 126
 127 //
 128 //  The FuDesc object
 129 //
 130 FUDesc *
 131 FUDescParams::create()
 132 {
 133     return new FUDesc(this);
 134 }