scoreboard.hh (10104:ff709c429b7b) scoreboard.hh (12105:742d80361989)
1/*
2 * Copyright (c) 2005-2006 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

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41#include "base/trace.hh"
42#include "config/the_isa.hh"
43#include "cpu/o3/comm.hh"
44#include "debug/Scoreboard.hh"
45
46/**
47 * Implements a simple scoreboard to track which registers are
48 * ready. This class operates on the unified physical register space,
1/*
2 * Copyright (c) 2005-2006 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

--- 32 unchanged lines hidden (view full) ---

41#include "base/trace.hh"
42#include "config/the_isa.hh"
43#include "cpu/o3/comm.hh"
44#include "debug/Scoreboard.hh"
45
46/**
47 * Implements a simple scoreboard to track which registers are
48 * ready. This class operates on the unified physical register space,
49 * so integer and floating-point registers are not distinguished. For
50 * convenience, it also accepts operations on the physical-space
51 * mapping of misc registers, which are numbered starting after the
52 * end of the actual physical register file. However, there is no
53 * actual scoreboard for misc registers, and they are always
54 * considered ready.
49 * because the different classes of registers do not need to be distinguished.
50 * Registers being part of a fixed mapping are always considered ready.
55 */
56class Scoreboard
57{
58 private:
59 /** The object name, for DPRINTF. We have to declare this
60 * explicitly because Scoreboard is not a SimObject. */
61 const std::string _name;
62
63 /** Scoreboard of physical integer registers, saying whether or not they
64 * are ready. */
65 std::vector<bool> regScoreBoard;
66
67 /** The number of actual physical registers */
68 unsigned numPhysRegs;
69
51 */
52class Scoreboard
53{
54 private:
55 /** The object name, for DPRINTF. We have to declare this
56 * explicitly because Scoreboard is not a SimObject. */
57 const std::string _name;
58
59 /** Scoreboard of physical integer registers, saying whether or not they
60 * are ready. */
61 std::vector<bool> regScoreBoard;
62
63 /** The number of actual physical registers */
64 unsigned numPhysRegs;
65
70 /**
71 * The total number of registers which can be indexed, including
72 * the misc registers that come after the physical registers and
73 * which are hardwired to be always considered ready.
74 */
75 unsigned M5_CLASS_VAR_USED numTotalRegs;
76
77 /** The index of the zero register. */
78 PhysRegIndex zeroRegIdx;
79
80 /** The index of the FP zero register. */
81 PhysRegIndex fpZeroRegIdx;
82
83 bool isZeroReg(PhysRegIndex idx) const
84 {
85 return (idx == zeroRegIdx ||
86 (THE_ISA == ALPHA_ISA && idx == fpZeroRegIdx));
87 }
88
89 public:
90 /** Constructs a scoreboard.
91 * @param _numPhysicalRegs Number of physical registers.
92 * @param _numMiscRegs Number of miscellaneous registers.
66 public:
67 /** Constructs a scoreboard.
68 * @param _numPhysicalRegs Number of physical registers.
69 * @param _numMiscRegs Number of miscellaneous registers.
93 * @param _zeroRegIdx Index of the zero register.
94 * @param _fpZeroRegIdx Index of the FP zero register (if any, currently
95 * used only for Alpha).
96 */
97 Scoreboard(const std::string &_my_name,
70 */
71 Scoreboard(const std::string &_my_name,
98 unsigned _numPhysicalRegs,
99 unsigned _numMiscRegs,
100 PhysRegIndex _zeroRegIdx,
101 PhysRegIndex _fpZeroRegIdx);
72 unsigned _numPhysicalRegs);
102
103 /** Destructor. */
104 ~Scoreboard() {}
105
106 /** Returns the name of the scoreboard. */
107 std::string name() const { return _name; };
108
109 /** Checks if the register is ready. */
73
74 /** Destructor. */
75 ~Scoreboard() {}
76
77 /** Returns the name of the scoreboard. */
78 std::string name() const { return _name; };
79
80 /** Checks if the register is ready. */
110 bool getReg(PhysRegIndex reg_idx) const
81 bool getReg(PhysRegIdPtr phys_reg) const
111 {
82 {
112 assert(reg_idx < numTotalRegs);
83 assert(phys_reg->flatIdx < numPhysRegs);
113
84
114 if (reg_idx >= numPhysRegs) {
115 // misc regs are always ready
85 if (phys_reg->isFixedMapping()) {
86 // Fixed mapping regs are always ready
116 return true;
117 }
118
87 return true;
88 }
89
119 bool ready = regScoreBoard[reg_idx];
90 bool ready = regScoreBoard[phys_reg->flatIdx];
120
91
121 if (isZeroReg(reg_idx))
92 if (phys_reg->isZeroReg())
122 assert(ready);
123
124 return ready;
125 }
126
127 /** Sets the register as ready. */
93 assert(ready);
94
95 return ready;
96 }
97
98 /** Sets the register as ready. */
128 void setReg(PhysRegIndex reg_idx)
99 void setReg(PhysRegIdPtr phys_reg)
129 {
100 {
130 assert(reg_idx < numTotalRegs);
101 assert(phys_reg->flatIdx < numPhysRegs);
131
102
132 if (reg_idx >= numPhysRegs) {
133 // misc regs are always ready, ignore attempts to change that
103 if (phys_reg->isFixedMapping()) {
104 // Fixed mapping regs are always ready, ignore attempts to change
105 // that
134 return;
135 }
136
106 return;
107 }
108
137 DPRINTF(Scoreboard, "Setting reg %i as ready\n", reg_idx);
109 DPRINTF(Scoreboard, "Setting reg %i (%s) as ready\n", phys_reg->regIdx,
110 RegClassStrings[phys_reg->regClass]);
138
111
139 assert(reg_idx < numTotalRegs);
140 regScoreBoard[reg_idx] = true;
112 regScoreBoard[phys_reg->flatIdx] = true;
141 }
142
143 /** Sets the register as not ready. */
113 }
114
115 /** Sets the register as not ready. */
144 void unsetReg(PhysRegIndex reg_idx)
116 void unsetReg(PhysRegIdPtr phys_reg)
145 {
117 {
146 assert(reg_idx < numTotalRegs);
118 assert(phys_reg->flatIdx < numPhysRegs);
147
119
148 if (reg_idx >= numPhysRegs) {
149 // misc regs are always ready, ignore attempts to change that
120 if (phys_reg->isFixedMapping()) {
121 // Fixed mapping regs are always ready, ignore attempts to
122 // change that
150 return;
151 }
152
153 // zero reg should never be marked unready
123 return;
124 }
125
126 // zero reg should never be marked unready
154 if (isZeroReg(reg_idx))
127 if (phys_reg->isZeroReg())
155 return;
156
128 return;
129
157 regScoreBoard[reg_idx] = false;
130 regScoreBoard[phys_reg->flatIdx] = false;
158 }
159
160};
161
162#endif
131 }
132
133};
134
135#endif