2 * Copyright (c) 2005-2006 The Regents of The University of Michigan
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14 * this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 * Authors: Korey Sewell
32 #ifndef __CPU_O3_SCOREBOARD_HH__
33 #define __CPU_O3_SCOREBOARD_HH__
39 #include "base/trace.hh"
40 #include "cpu/o3/comm.hh"
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
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.
53 /** 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.
59 * @param _numMiscRegs Number of miscellaneous registers.
60 * @param _zeroRegIdx Index of the zero register.
62 Scoreboard(unsigned activeThreads,
63 unsigned _numLogicalIntRegs,
64 unsigned _numPhysicalIntRegs,
65 unsigned _numLogicalFloatRegs,
66 unsigned _numPhysicalFloatRegs,
67 unsigned _numMiscRegs,
68 unsigned _zeroRegIdx);
73 /** Returns the name of the scoreboard. */
74 std::string name() const;
76 /** Checks if the register is ready. */
77 bool getReg(PhysRegIndex ready_reg);
79 /** Sets the register as ready. */
80 void setReg(PhysRegIndex phys_reg);
82 /** Sets the register as not ready. */
83 void unsetReg(PhysRegIndex ready_reg);
86 /** Scoreboard of physical integer registers, saying whether or not they
89 std::vector<bool> regScoreBoard;
91 /** Number of logical integer registers. */
92 int numLogicalIntRegs;
94 /** Number of physical integer registers. */
95 int numPhysicalIntRegs;
97 /** Number of logical floating point registers. */
98 int numLogicalFloatRegs;
100 /** Number of physical floating point registers. */
101 int numPhysicalFloatRegs;
103 /** Number of miscellaneous registers. */
106 /** Number of logical integer + float registers. */
109 /** Number of physical integer + float registers. */
112 /** The logical index of the zero register. */
120 currentSize = newSize;
121 regScoreBoard.resize(newSize);
125 indexInBounds(int idx)
127 return idx < currentSize;