regfile.cc revision 12106:7784fac1b159 
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 *          Gabe Black
31 *          Steve Reinhardt
32 */
33
34#include "cpu/o3/regfile.hh"
35
36#include "cpu/o3/free_list.hh"
37
38PhysRegFile::PhysRegFile(unsigned _numPhysicalIntRegs,
39                         unsigned _numPhysicalFloatRegs,
40                         unsigned _numPhysicalCCRegs)
41    : intRegFile(_numPhysicalIntRegs),
42      floatRegFile(_numPhysicalFloatRegs),
43      ccRegFile(_numPhysicalCCRegs),
44      numPhysicalIntRegs(_numPhysicalIntRegs),
45      numPhysicalFloatRegs(_numPhysicalFloatRegs),
46      numPhysicalCCRegs(_numPhysicalCCRegs),
47      totalNumRegs(_numPhysicalIntRegs
48                   + _numPhysicalFloatRegs
49                   + _numPhysicalCCRegs)
50{
51    PhysRegIndex phys_reg;
52    PhysRegIndex flat_reg_idx = 0;
53
54    if (TheISA::NumCCRegs == 0 && _numPhysicalCCRegs != 0) {
55        // Just make this a warning and go ahead and allocate them
56        // anyway, to keep from having to add checks everywhere
57        warn("Non-zero number of physical CC regs specified, even though\n"
58             "    ISA does not use them.\n");
59    }
60    // The initial batch of registers are the integer ones
61    for (phys_reg = 0; phys_reg < numPhysicalIntRegs; phys_reg++) {
62        intRegIds.emplace_back(IntRegClass, phys_reg, flat_reg_idx++);
63    }
64
65    // The next batch of the registers are the floating-point physical
66    // registers; put them onto the floating-point free list.
67    for (phys_reg = 0; phys_reg < numPhysicalFloatRegs; phys_reg++) {
68        floatRegIds.emplace_back(FloatRegClass, phys_reg, flat_reg_idx++);
69    }
70
71    // The rest of the registers are the condition-code physical
72    // registers; put them onto the condition-code free list.
73    for (phys_reg = 0; phys_reg < numPhysicalCCRegs; phys_reg++) {
74        ccRegIds.emplace_back(CCRegClass, phys_reg, flat_reg_idx++);
75    }
76
77    // Misc regs have a fixed mapping but still need PhysRegIds.
78    for (phys_reg = 0; phys_reg < TheISA::NumMiscRegs; phys_reg++) {
79        miscRegIds.emplace_back(MiscRegClass, phys_reg, 0);
80    }
81}
82
83
84void
85PhysRegFile::initFreeList(UnifiedFreeList *freeList)
86{
87    // Initialize the free lists.
88    int reg_idx = 0;
89
90    // The initial batch of registers are the integer ones
91    for (reg_idx = 0; reg_idx < numPhysicalIntRegs; reg_idx++) {
92        assert(intRegIds[reg_idx].index() == reg_idx);
93        freeList->addIntReg(&intRegIds[reg_idx]);
94    }
95
96    // The next batch of the registers are the floating-point physical
97    // registers; put them onto the floating-point free list.
98    for (reg_idx = 0; reg_idx < numPhysicalFloatRegs; reg_idx++) {
99        assert(floatRegIds[reg_idx].index() == reg_idx);
100        freeList->addFloatReg(&floatRegIds[reg_idx]);
101    }
102
103    // The rest of the registers are the condition-code physical
104    // registers; put them onto the condition-code free list.
105    for (reg_idx = 0; reg_idx < numPhysicalCCRegs; reg_idx++) {
106        assert(ccRegIds[reg_idx].index() == reg_idx);
107        freeList->addCCReg(&ccRegIds[reg_idx]);
108    }
109}
110