rename_map.cc revision 10935:acd48ddd725f 
1/*
2 * Copyright (c) 2004-2005 The Regents of The University of Michigan
3 * Copyright (c) 2013 Advanced Micro Devices, Inc.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are
8 * met: redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer;
10 * redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution;
13 * neither the name of the copyright holders nor the names of its
14 * contributors may be used to endorse or promote products derived from
15 * this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * Authors: Kevin Lim
30 */
31
32#include <vector>
33
34#include "cpu/o3/rename_map.hh"
35#include "debug/Rename.hh"
36
37using namespace std;
38
39/**** SimpleRenameMap methods ****/
40
41SimpleRenameMap::SimpleRenameMap()
42    : freeList(NULL), zeroReg(0)
43{
44}
45
46
47void
48SimpleRenameMap::init(unsigned size, SimpleFreeList *_freeList,
49                      RegIndex _zeroReg)
50{
51    assert(freeList == NULL);
52    assert(map.empty());
53
54    map.resize(size);
55    freeList = _freeList;
56    zeroReg = _zeroReg;
57}
58
59SimpleRenameMap::RenameInfo
60SimpleRenameMap::rename(RegIndex arch_reg)
61{
62    PhysRegIndex renamed_reg;
63
64    // Record the current physical register that is renamed to the
65    // requested architected register.
66    PhysRegIndex prev_reg = map[arch_reg];
67
68    // If it's not referencing the zero register, then rename the
69    // register.
70    if (arch_reg != zeroReg) {
71        renamed_reg = freeList->getReg();
72
73        map[arch_reg] = renamed_reg;
74    } else {
75        // Otherwise return the zero register so nothing bad happens.
76        assert(prev_reg == zeroReg);
77        renamed_reg = zeroReg;
78    }
79
80    DPRINTF(Rename, "Renamed reg %d to physical reg %d old mapping was %d\n",
81            arch_reg, renamed_reg, prev_reg);
82
83    return RenameInfo(renamed_reg, prev_reg);
84}
85
86
87/**** UnifiedRenameMap methods ****/
88
89void
90UnifiedRenameMap::init(PhysRegFile *_regFile,
91                       RegIndex _intZeroReg,
92                       RegIndex _floatZeroReg,
93                       UnifiedFreeList *freeList)
94{
95    regFile = _regFile;
96
97    intMap.init(TheISA::NumIntRegs, &(freeList->intList), _intZeroReg);
98
99    floatMap.init(TheISA::NumFloatRegs, &(freeList->floatList), _floatZeroReg);
100
101    ccMap.init(TheISA::NumCCRegs, &(freeList->ccList), (RegIndex)-1);
102}
103
104
105UnifiedRenameMap::RenameInfo
106UnifiedRenameMap::rename(RegIndex arch_reg)
107{
108    RegIndex rel_arch_reg;
109
110    switch (regIdxToClass(arch_reg, &rel_arch_reg)) {
111      case IntRegClass:
112        return renameInt(rel_arch_reg);
113
114      case FloatRegClass:
115        return renameFloat(rel_arch_reg);
116
117      case CCRegClass:
118        return renameCC(rel_arch_reg);
119
120      case MiscRegClass:
121        return renameMisc(rel_arch_reg);
122
123      default:
124        panic("rename rename(): unknown reg class %s\n",
125              RegClassStrings[regIdxToClass(arch_reg)]);
126    }
127}
128
129
130PhysRegIndex
131UnifiedRenameMap::lookup(RegIndex arch_reg) const
132{
133    RegIndex rel_arch_reg;
134
135    switch (regIdxToClass(arch_reg, &rel_arch_reg)) {
136      case IntRegClass:
137        return lookupInt(rel_arch_reg);
138
139      case FloatRegClass:
140        return lookupFloat(rel_arch_reg);
141
142      case CCRegClass:
143        return lookupCC(rel_arch_reg);
144
145      case MiscRegClass:
146        return lookupMisc(rel_arch_reg);
147
148      default:
149        panic("rename lookup(): unknown reg class %s\n",
150              RegClassStrings[regIdxToClass(arch_reg)]);
151    }
152}
153
154void
155UnifiedRenameMap::setEntry(RegIndex arch_reg, PhysRegIndex phys_reg)
156{
157    RegIndex rel_arch_reg;
158
159    switch (regIdxToClass(arch_reg, &rel_arch_reg)) {
160      case IntRegClass:
161        return setIntEntry(rel_arch_reg, phys_reg);
162
163      case FloatRegClass:
164        return setFloatEntry(rel_arch_reg, phys_reg);
165
166      case CCRegClass:
167        return setCCEntry(rel_arch_reg, phys_reg);
168
169      case MiscRegClass:
170        // Misc registers do not actually rename, so don't change
171        // their mappings.  We end up here when a commit or squash
172        // tries to update or undo a hardwired misc reg nmapping,
173        // which should always be setting it to what it already is.
174        assert(phys_reg == lookupMisc(rel_arch_reg));
175        return;
176
177      default:
178        panic("rename setEntry(): unknown reg class %s\n",
179              RegClassStrings[regIdxToClass(arch_reg)]);
180    }
181}
182