C++ Machine::getPPCRealRegister方法代码示例

static void assignFreeRegisters(TR::Instruction              *currentInstruction,
                                TR::RegisterDependency    *dep,
                                TR_PPCRegisterDependencyMap& map,
                                TR::CodeGenerator            *cg)
   {
   // *this    swipeable for debugging purposes
   TR::Machine *machine = cg->machine();

   // Assign a chain of dependencies where the head of the chain depends on a free reg
   while (dep)
      {
      TR_ASSERT(machine->getPPCRealRegister(dep->getRealRegister())->getState() == TR::RealRegister::Free, "Expecting free target register");
      TR::RealRegister *assignedReg = dep->getRegister()->getAssignedRealRegister() ?
         toRealRegister(dep->getRegister()->getAssignedRealRegister()) : NULL;
      machine->coerceRegisterAssignment(currentInstruction, dep->getRegister(), dep->getRealRegister());
      dep->getRegister()->block();
      dep = assignedReg ?
         map.getDependencyWithTarget(assignedReg->getRegisterNumber()) : NULL;
      }
   }

//.........这里部分代码省略.........
               cg->freeSpill(location,dataSize,0);
               virtReg->setBackingStorage(NULL);
               }
            }
         }
      }

   for (i = 0; i < numberOfRegisters; i++)
      {
      map.addDependency(_dependencies[i], i);

      virtReg = _dependencies[i].getRegister();
      dependentRegNum = _dependencies[i].getRealRegister();

      if (dependentRegNum != TR::RealRegister::SpilledReg)
         {
         if (virtReg->getKind() == TR_GPR)
            num_gprs++;
         else if (virtReg->getKind() == TR_FPR)
            num_fprs++;
         else if (virtReg->getKind() == TR_VRF)
            num_vrfs++;
         }
      }

#ifdef DEBUG
   int locked_gprs = 0;
   int locked_fprs = 0;
   int locked_vrfs = 0;

   // count up how many registers are locked for each type
   for(i = TR::RealRegister::FirstGPR; i <= TR::RealRegister::LastGPR; i++)
      {
        realReg = machine->getPPCRealRegister((TR::RealRegister::RegNum)i);
        if (realReg->getState() == TR::RealRegister::Locked)
           locked_gprs++;
      }
   for(i = TR::RealRegister::FirstFPR; i <= TR::RealRegister::LastFPR; i++)
      {
        realReg = machine->getPPCRealRegister((TR::RealRegister::RegNum)i);
        if (realReg->getState() == TR::RealRegister::Locked)
           locked_fprs++;
      }
   for(i = TR::RealRegister::FirstVRF; i <= TR::RealRegister::LastVRF; i++)
      {
        realReg = machine->getPPCRealRegister((TR::RealRegister::RegNum)i);
        if (realReg->getState() == TR::RealRegister::Locked)
           locked_vrfs++;
      }
   TR_ASSERT( locked_gprs == machine->getNumberOfLockedRegisters(TR_GPR),"Inconsistent number of locked GPRs");
   TR_ASSERT( locked_fprs == machine->getNumberOfLockedRegisters(TR_FPR),"Inconsistent number of locked FPRs");
   TR_ASSERT( locked_vrfs == machine->getNumberOfLockedRegisters(TR_VRF), "Inconsistent number of locked VRFs");
#endif

   // To handle circular dependencies, we block a real register if (1) it is already assigned to a correct
   // virtual register and (2) if it is assigned to one register in the list but is required by another.
   // However, if all available registers are requested, we do not block in case (2) to avoid all registers
   // being blocked.

   bool block_gprs = true;
   bool block_fprs = true;
   bool block_vrfs = true;

   TR_ASSERT(num_gprs <= (TR::RealRegister::LastGPR - TR::RealRegister::FirstGPR + 1 - machine->getNumberOfLockedRegisters(TR_GPR)), "Too many GPR dependencies, unable to assign" );
   TR_ASSERT(num_fprs <= (TR::RealRegister::LastFPR - TR::RealRegister::FirstFPR + 1 - machine->getNumberOfLockedRegisters(TR_FPR)), "Too many FPR dependencies, unable to assign" );
   TR_ASSERT(num_vrfs <= (TR::RealRegister::LastVRF - TR::RealRegister::FirstVRF + 1 - machine->getNumberOfLockedRegisters(TR_VRF)), "Too many VRF dependencies, unable to assign" );

static void assignContendedRegisters(TR::Instruction              *currentInstruction,
                                     TR::RegisterDependency    *dep,
                                     TR_PPCRegisterDependencyMap& map,
                                     bool                         depsBlocked,
                                     TR::CodeGenerator            *cg)
   {
   // *this    swipeable for debugging purposes
   TR::Machine *machine = cg->machine();

   dep = findDependencyChainHead(dep, map);


   TR::Register *virtReg = dep->getRegister();
   TR::RealRegister::RegNum targetRegNum = dep->getRealRegister();
   TR::RealRegister *targetReg = machine->getPPCRealRegister(targetRegNum);
   TR::RealRegister *assignedReg = virtReg->getAssignedRealRegister() ?
      toRealRegister(virtReg->getAssignedRealRegister()) :  NULL;


   // Chain of length 1
   if (!assignedReg || !map.getDependencyWithTarget(assignedReg->getRegisterNumber()))
      {
      machine->coerceRegisterAssignment(currentInstruction, virtReg, targetRegNum);
      virtReg->block();
      return;
      }
   // Chain of length 2, handled here instead of below to get 3*xor exchange on GPRs
   if (map.getDependencyWithTarget(assignedReg->getRegisterNumber()) == map.getDependencyWithAssigned(targetRegNum))
      {
      TR::Register *targetVirtReg = targetReg->getAssignedRegister();
      machine->coerceRegisterAssignment(currentInstruction, virtReg, targetRegNum);
      virtReg->block();
      targetVirtReg->block();
      return;
      }

   // Grab a spare reg in order to free the target of the first dep
   // At this point the first dep's target could be blocked, assigned, or NoReg
   // If it's blocked or assigned we allocate a spare and assign the target's virtual to it
   // If it's NoReg, the spare reg will be used as the first dep's actual target
   TR::RealRegister *spareReg = machine->findBestFreeRegister(currentInstruction, virtReg->getKind(),
                                                                targetRegNum == TR::RealRegister::NoReg ? dep->getExcludeGPR0() : false, false,
                                                                targetRegNum == TR::RealRegister::NoReg ? virtReg : targetReg->getAssignedRegister());
   bool                haveFreeSpare = spareReg != NULL;
   if (!spareReg)
      {
      // If the regs in this dep group are not blocked we need to make sure we don't spill a reg that's in the middle of the chain
      if (!depsBlocked)
         {
         if (targetRegNum == TR::RealRegister::NoReg)
            spareReg = machine->freeBestRegister(currentInstruction,
                                                 map.getDependencyWithTarget(assignedReg->getRegisterNumber())->getRegister(),
                                                 assignedReg, false);
         else
            spareReg = machine->freeBestRegister(currentInstruction, virtReg, targetReg, false);
         }
      else
         {
         if (targetRegNum == TR::RealRegister::NoReg)
            spareReg = machine->freeBestRegister(currentInstruction, virtReg, NULL, dep->getExcludeGPR0());
         else
            spareReg = machine->freeBestRegister(currentInstruction, targetReg->getAssignedRegister(), NULL, false);
         }
      }

   if (targetRegNum != TR::RealRegister::NoReg && spareReg != targetReg)
      {
      machine->coerceRegisterAssignment(currentInstruction, targetReg->getAssignedRegister(), spareReg->getRegisterNumber());
      }

   TR_ASSERT(targetRegNum == TR::RealRegister::NoReg ||
          targetReg->getState() == TR::RealRegister::Free, "Expecting free target register");

   if (depsBlocked || targetRegNum != TR::RealRegister::NoReg || haveFreeSpare)
      {

      machine->coerceRegisterAssignment(currentInstruction, virtReg,
                                        targetRegNum == TR::RealRegister::NoReg ?
                                        spareReg->getRegisterNumber() : targetRegNum);
      virtReg->block();
      }

   dep = map.getDependencyWithTarget(assignedReg->getRegisterNumber());
   while (dep)
      {
      virtReg = dep->getRegister();
      targetRegNum = dep->getRealRegister();
      targetReg = machine->getPPCRealRegister(targetRegNum);
      assignedReg = virtReg->getAssignedRealRegister() ?
         toRealRegister(virtReg->getAssignedRealRegister()) : NULL;

      TR_ASSERT(targetReg->getState() == TR::RealRegister::Free || targetReg == spareReg,
             "Expecting free target register or target to have been filled to free spare register");

      machine->coerceRegisterAssignment(currentInstruction, virtReg, targetRegNum);
      virtReg->block();
      dep = assignedReg ?
         map.getDependencyWithTarget(assignedReg->getRegisterNumber()) : NULL;
      }

//.........这里部分代码省略.........