func_unit.cc revision 10936:93890720a932 
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
36using namespace std;
37
38
39////////////////////////////////////////////////////////////////////////////
40//
41//  The funciton unit
42//
43FuncUnit::FuncUnit()
44{
45    opLatencies.fill(0);
46    pipelined.fill(false);
47    capabilityList.reset();
48}
49
50
51//  Copy constructor
52FuncUnit::FuncUnit(const FuncUnit &fu)
53{
54
55    for (int i = 0; i < Num_OpClasses; ++i) {
56        opLatencies[i] = fu.opLatencies[i];
57        pipelined[i] = fu.pipelined[i];
58    }
59
60    capabilityList = fu.capabilityList;
61}
62
63
64void
65FuncUnit::addCapability(OpClass cap, unsigned oplat, bool pipeline)
66{
67    if (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    pipelined[cap] = pipeline;
74}
75
76bool
77FuncUnit::provides(OpClass capability)
78{
79    return capabilityList[capability];
80}
81
82bitset<Num_OpClasses>
83FuncUnit::capabilities()
84{
85    return capabilityList;
86}
87
88unsigned &
89FuncUnit::opLatency(OpClass cap)
90{
91    return opLatencies[cap];
92}
93
94bool
95FuncUnit::isPipelined(OpClass capability)
96{
97    return pipelined[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//
120OpDesc *
121OpDescParams::create()
122{
123    return new OpDesc(this);
124}
125
126//
127//  The FuDesc object
128//
129FUDesc *
130FUDescParams::create()
131{
132    return new FUDesc(this);
133}
134