scoreboard.hh (8232:b28d06a175be) | scoreboard.hh (9916:9c3a4595cce9) |
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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. |
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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 |
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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" |
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40#include "cpu/o3/comm.hh" | 43#include "cpu/o3/comm.hh" |
44#include "debug/Scoreboard.hh" |
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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 |
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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). |
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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 |