scoreboard.hh (10104:ff709c429b7b) | scoreboard.hh (12105:742d80361989) |
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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, | 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 |