C++ (Cpp) VirtRegMap::isSpillSlotUsed示例

示例#1

void
UserValue::rewriteLocations(VirtRegMap &VRM, const TargetRegisterInfo &TRI) {
  // Iterate over locations in reverse makes it easier to handle coalescing.
  for (unsigned i = locations.size(); i ; --i) {
    unsigned LocNo = i-1;
    MachineOperand &Loc = locations[LocNo];
    // Only virtual registers are rewritten.
    if (!Loc.isReg() || !Loc.getReg() ||
        !TargetRegisterInfo::isVirtualRegister(Loc.getReg()))
      continue;
    unsigned VirtReg = Loc.getReg();
    if (VRM.isAssignedReg(VirtReg) &&
        TargetRegisterInfo::isPhysicalRegister(VRM.getPhys(VirtReg))) {
      Loc.substPhysReg(VRM.getPhys(VirtReg), TRI);
    } else if (VRM.getStackSlot(VirtReg) != VirtRegMap::NO_STACK_SLOT &&
               VRM.isSpillSlotUsed(VRM.getStackSlot(VirtReg))) {
      // FIXME: Translate SubIdx to a stackslot offset.
      Loc = MachineOperand::CreateFI(VRM.getStackSlot(VirtReg));
    } else {
      Loc.setReg(0);
      Loc.setSubReg(0);
    }
    coalesceLocation(LocNo);
  }
  DEBUG(print(dbgs(), &TRI));
}