Ejemplo n.º 1
0
void RegisterFile::initialize(const MCSchedModel &SM, unsigned NumRegs) {
  // Create a default register file that "sees" all the machine registers
  // declared by the target. The number of physical registers in the default
  // register file is set equal to `NumRegs`. A value of zero for `NumRegs`
  // means: this register file has an unbounded number of physical registers.
  addRegisterFile({} /* all registers */, NumRegs);
  if (!SM.hasExtraProcessorInfo())
    return;

  // For each user defined register file, allocate a RegisterMappingTracker
  // object. The size of every register file, as well as the mapping between
  // register files and register classes is specified via tablegen.
  const MCExtraProcessorInfo &Info = SM.getExtraProcessorInfo();
  for (unsigned I = 0, E = Info.NumRegisterFiles; I < E; ++I) {
    const MCRegisterFileDesc &RF = Info.RegisterFiles[I];
    // Skip invalid register files with zero physical registers.
    unsigned Length = RF.NumRegisterCostEntries;
    if (!RF.NumPhysRegs)
      continue;
    // The cost of a register definition is equivalent to the number of
    // physical registers that are allocated at register renaming stage.
    const MCRegisterCostEntry *FirstElt =
        &Info.RegisterCostTable[RF.RegisterCostEntryIdx];
    addRegisterFile(ArrayRef<MCRegisterCostEntry>(FirstElt, Length),
                    RF.NumPhysRegs);
  }
}
Ejemplo n.º 2
0
RetireControlUnit::RetireControlUnit(const MCSchedModel &SM)
    : NextAvailableSlotIdx(0), CurrentInstructionSlotIdx(0),
      AvailableSlots(SM.MicroOpBufferSize), MaxRetirePerCycle(0) {
  // Check if the scheduling model provides extra information about the machine
  // processor. If so, then use that information to set the reorder buffer size
  // and the maximum number of instructions retired per cycle.
  if (SM.hasExtraProcessorInfo()) {
    const MCExtraProcessorInfo &EPI = SM.getExtraProcessorInfo();
    if (EPI.ReorderBufferSize)
      AvailableSlots = EPI.ReorderBufferSize;
    MaxRetirePerCycle = EPI.MaxRetirePerCycle;
  }

  assert(AvailableSlots && "Invalid reorder buffer size!");
  Queue.resize(AvailableSlots);
}