src/cpu/func_unit.cc

   1 /*
   2  * Copyright (c) 2002-2006 The Regents of The University of Michigan
   3  * All rights reserved.
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  10  * notice, this list of conditions and the following disclaimer in the
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  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
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  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include "cpu/func_unit.hh"
  30
  31 #include <sstream>
  32
  33 #include "base/logging.hh"
  34
  35 using namespace std;
  36
  37
  38 ////////////////////////////////////////////////////////////////////////////
  39 //
  40 //  The funciton unit
  41 //
  42 FuncUnit::FuncUnit()
  43 {
  44     opLatencies.fill(0);
  45     pipelined.fill(false);
  46     capabilityList.reset();
  47 }
  48
  49
  50 //  Copy constructor
  51 FuncUnit::FuncUnit(const FuncUnit &fu)
  52 {
  53
  54     for (int i = 0; i < Num_OpClasses; ++i) {
  55         opLatencies[i] = fu.opLatencies[i];
  56         pipelined[i] = fu.pipelined[i];
  57     }
  58
  59     capabilityList = fu.capabilityList;
  60 }
  61
  62
  63 void
  64 FuncUnit::addCapability(OpClass cap, unsigned oplat, bool pipeline)
  65 {
  66     if (oplat == 0)
  67         panic("FuncUnit:  you don't really want a zero-cycle latency do you?");
  68
  69     capabilityList.set(cap);
  70
  71     opLatencies[cap] = oplat;
  72     pipelined[cap] = pipeline;
  73 }
  74
  75 bool
  76 FuncUnit::provides(OpClass capability)
  77 {
  78     return capabilityList[capability];
  79 }
  80
  81 bitset<Num_OpClasses>
  82 FuncUnit::capabilities()
  83 {
  84     return capabilityList;
  85 }
  86
  87 unsigned &
  88 FuncUnit::opLatency(OpClass cap)
  89 {
  90     return opLatencies[cap];
  91 }
  92
  93 bool
  94 FuncUnit::isPipelined(OpClass capability)
  95 {
  96     return pipelined[capability];
  97 }
  98
  99 ////////////////////////////////////////////////////////////////////////////
 100 //
 101 //  The SimObjects we use to get the FU information into the simulator
 102 //
 103 ////////////////////////////////////////////////////////////////////////////
 104
 105 //
 106 //  We use 2 objects to specify this data in the INI file:
 107 //    (1) OpDesc - Describes the operation class & latencies
 108 //                   (multiple OpDesc objects can refer to the same
 109 //                   operation classes)
 110 //    (2) FUDesc - Describes the operations available in the unit &
 111 //                   the number of these units
 112 //
 113 //
 114
 115
 116 //
 117 //  The operation-class description object
 118 //
 119 OpDesc *
 120 OpDescParams::create()
 121 {
 122     return new OpDesc(this);
 123 }
 124
 125 //
 126 //  The FuDesc object
 127 //
 128 FUDesc *
 129 FUDescParams::create()
 130 {
 131     return new FUDesc(this);
 132 }