gem5  v20.1.0.0
scoreboard.hh
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29 
30 #ifndef __CPU_O3_SCOREBOARD_HH__
31 #define __CPU_O3_SCOREBOARD_HH__
32 
33 #include <iostream>
34 #include <utility>
35 #include <vector>
36 
37 #include "base/trace.hh"
38 #include "config/the_isa.hh"
39 #include "cpu/o3/comm.hh"
40 #include "debug/Scoreboard.hh"
41 
49 {
50  private:
53  const std::string _name;
54 
58 
61 
62  public:
67  Scoreboard(const std::string &_my_name,
68  unsigned _numPhysicalRegs);
69 
72 
74  std::string name() const { return _name; };
75 
77  bool getReg(PhysRegIdPtr phys_reg) const
78  {
79  assert(phys_reg->flatIndex() < numPhysRegs);
80 
81  if (phys_reg->isFixedMapping()) {
82  // Fixed mapping regs are always ready
83  return true;
84  }
85 
86  bool ready = regScoreBoard[phys_reg->flatIndex()];
87 
88  if (phys_reg->isZeroReg())
89  assert(ready);
90 
91  return ready;
92  }
93 
95  void setReg(PhysRegIdPtr phys_reg)
96  {
97  assert(phys_reg->flatIndex() < numPhysRegs);
98 
99  if (phys_reg->isFixedMapping()) {
100  // Fixed mapping regs are always ready, ignore attempts to change
101  // that
102  return;
103  }
104 
105  DPRINTF(Scoreboard, "Setting reg %i (%s) as ready\n",
106  phys_reg->index(), phys_reg->className());
107 
108  regScoreBoard[phys_reg->flatIndex()] = true;
109  }
110 
112  void unsetReg(PhysRegIdPtr phys_reg)
113  {
114  assert(phys_reg->flatIndex() < numPhysRegs);
115 
116  if (phys_reg->isFixedMapping()) {
117  // Fixed mapping regs are always ready, ignore attempts to
118  // change that
119  return;
120  }
121 
122  // zero reg should never be marked unready
123  if (phys_reg->isZeroReg())
124  return;
125 
126  regScoreBoard[phys_reg->flatIndex()] = false;
127  }
128 
129 };
130 
131 #endif
Scoreboard::setReg
void setReg(PhysRegIdPtr phys_reg)
Sets the register as ready.
Definition: scoreboard.hh:95
PhysRegId::isZeroReg
bool isZeroReg() const
Check if this is the zero register.
Definition: reg_class.hh:137
PhysRegId::flatIndex
const PhysRegIndex & flatIndex() const
Flat index accessor.
Definition: reg_class.hh:305
std::vector< bool >
Scoreboard::Scoreboard
Scoreboard(const std::string &_my_name, unsigned _numPhysicalRegs)
Constructs a scoreboard.
Definition: scoreboard.cc:35
PhysRegId::isFixedMapping
bool isFixedMapping() const
Returns true if this register is always associated to the same architectural register.
Definition: reg_class.hh:299
comm.hh
M5_CLASS_VAR_USED
#define M5_CLASS_VAR_USED
Definition: compiler.hh:64
PhysRegId::index
const RegIndex & index() const
Visible RegId methods.
Definition: reg_class.hh:173
Scoreboard::~Scoreboard
~Scoreboard()
Destructor.
Definition: scoreboard.hh:71
DPRINTF
#define DPRINTF(x,...)
Definition: trace.hh:234
Scoreboard::getReg
bool getReg(PhysRegIdPtr phys_reg) const
Checks if the register is ready.
Definition: scoreboard.hh:77
Scoreboard::numPhysRegs
unsigned M5_CLASS_VAR_USED numPhysRegs
The number of actual physical registers.
Definition: scoreboard.hh:60
PhysRegId::className
const char * className() const
Return a const char* with the register class name.
Definition: reg_class.hh:202
Scoreboard::regScoreBoard
std::vector< bool > regScoreBoard
Scoreboard of physical integer registers, saying whether or not they are ready.
Definition: scoreboard.hh:57
PhysRegId
Physical register ID.
Definition: reg_class.hh:223
trace.hh
Scoreboard::_name
const std::string _name
The object name, for DPRINTF.
Definition: scoreboard.hh:53
Scoreboard::name
std::string name() const
Returns the name of the scoreboard.
Definition: scoreboard.hh:74
Scoreboard
Implements a simple scoreboard to track which registers are ready.
Definition: scoreboard.hh:48
Scoreboard::unsetReg
void unsetReg(PhysRegIdPtr phys_reg)
Sets the register as not ready.
Definition: scoreboard.hh:112

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