scoreboard.hh (8232:b28d06a175be) scoreboard.hh (9916:9c3a4595cce9)
1/*
2 * Copyright (c) 2005-2006 The Regents of The University of Michigan
1/*
2 * Copyright (c) 2005-2006 The Regents of The University of Michigan
3 * Copyright (c) 2013 Advanced Micro Devices, Inc.
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 unchanged lines hidden (view full) ---

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: Korey Sewell
29 * Kevin Lim
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

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

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: Korey Sewell
30 * Kevin Lim
31 * Steve Reinhardt
30 */
31
32#ifndef __CPU_O3_SCOREBOARD_HH__
33#define __CPU_O3_SCOREBOARD_HH__
34
35#include <iostream>
36#include <utility>
37#include <vector>
38
39#include "base/trace.hh"
32 */
33
34#ifndef __CPU_O3_SCOREBOARD_HH__
35#define __CPU_O3_SCOREBOARD_HH__
36
37#include <iostream>
38#include <utility>
39#include <vector>
40
41#include "base/trace.hh"
42#include "config/the_isa.hh"
40#include "cpu/o3/comm.hh"
43#include "cpu/o3/comm.hh"
44#include "debug/Scoreboard.hh"
41
42/**
45
46/**
43 * Implements a simple scoreboard to track which registers are ready.
44 * This class assumes that the fp registers start, index wise, right after
45 * the integer registers. The misc. registers start, index wise, right after
46 * the fp registers.
47 * @todo: Fix up handling of the zero register in case the decoder does not
48 * automatically make insts that write the zero register into nops.
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 */
50class Scoreboard
51{
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
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 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
52 public:
53 /** Constructs a scoreboard.
89 public:
90 /** Constructs a scoreboard.
54 * @param activeThreads The number of active threads.
55 * @param _numLogicalIntRegs Number of logical integer registers.
56 * @param _numPhysicalIntRegs Number of physical integer registers.
57 * @param _numLogicalFloatRegs Number of logical fp registers.
58 * @param _numPhysicalFloatRegs Number of physical fp registers.
91 * @param _numPhysicalRegs Number of physical registers.
59 * @param _numMiscRegs Number of miscellaneous registers.
60 * @param _zeroRegIdx Index of the zero register.
92 * @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).
61 */
96 */
62 Scoreboard(unsigned activeThreads,
63 unsigned _numLogicalIntRegs,
64 unsigned _numPhysicalIntRegs,
65 unsigned _numLogicalFloatRegs,
66 unsigned _numPhysicalFloatRegs,
97 Scoreboard(const std::string &_my_name,
98 unsigned _numPhysicalRegs,
67 unsigned _numMiscRegs,
99 unsigned _numMiscRegs,
68 unsigned _zeroRegIdx);
100 PhysRegIndex _zeroRegIdx,
101 PhysRegIndex _fpZeroRegIdx);
69
70 /** Destructor. */
71 ~Scoreboard() {}
72
73 /** Returns the name of the scoreboard. */
102
103 /** Destructor. */
104 ~Scoreboard() {}
105
106 /** Returns the name of the scoreboard. */
74 std::string name() const;
107 std::string name() const { return _name; };
75
76 /** Checks if the register is ready. */
108
109 /** Checks if the register is ready. */
77 bool getReg(PhysRegIndex ready_reg);
110 bool getReg(PhysRegIndex reg_idx) const
111 {
112 assert(reg_idx < numTotalRegs);
78
113
79 /** Sets the register as ready. */
80 void setReg(PhysRegIndex phys_reg);
114 if (reg_idx >= numPhysRegs) {
115 // misc regs are always ready
116 return true;
117 }
81
118
82 /** Sets the register as not ready. */
83 void unsetReg(PhysRegIndex ready_reg);
119 bool ready = regScoreBoard[reg_idx];
84
120
85 private:
86 /** Scoreboard of physical integer registers, saying whether or not they
87 * are ready.
88 */
89 std::vector<bool> regScoreBoard;
121 if (isZeroReg(reg_idx))
122 assert(ready);
90
123
91 /** Number of logical integer registers. */
92 int numLogicalIntRegs;
124 return ready;
125 }
93
126
94 /** Number of physical integer registers. */
95 int numPhysicalIntRegs;
127 /** Sets the register as ready. */
128 void setReg(PhysRegIndex reg_idx)
129 {
130 assert(reg_idx < numTotalRegs);
96
131
97 /** Number of logical floating point registers. */
98 int numLogicalFloatRegs;
132 if (reg_idx >= numPhysRegs) {
133 // misc regs are always ready, ignore attempts to change that
134 return;
135 }
99
136
100 /** Number of physical floating point registers. */
101 int numPhysicalFloatRegs;
137 DPRINTF(Scoreboard, "Setting reg %i as ready\n", reg_idx);
102
138
103 /** Number of miscellaneous registers. */
104 int numMiscRegs;
139 assert(reg_idx < numTotalRegs);
140 regScoreBoard[reg_idx] = true;
141 }
105
142
106 /** Number of logical integer + float registers. */
107 int numLogicalRegs;
143 /** Sets the register as not ready. */
144 void unsetReg(PhysRegIndex reg_idx)
145 {
146 assert(reg_idx < numTotalRegs);
108
147
109 /** Number of physical integer + float registers. */
110 int numPhysicalRegs;
148 if (reg_idx >= numPhysRegs) {
149 // misc regs are always ready, ignore attempts to change that
150 return;
151 }
111
152
112 /** The logical index of the zero register. */
113 int zeroRegIdx;
153 // zero reg should never be marked unready
154 if (isZeroReg(reg_idx))
155 return;
114
156
115 int currentSize;
116
117 void
118 resize(int newSize)
119 {
120 currentSize = newSize;
121 regScoreBoard.resize(newSize);
157 regScoreBoard[reg_idx] = false;
122 }
123
158 }
159
124 bool
125 indexInBounds(int idx)
126 {
127 return idx < currentSize;
128 }
129};
130
131#endif
160};
161
162#endif