- MachineRegisterInfo &mri = mf_.getRegInfo();
- const TargetRegisterInfo *tri = mf_.getTarget().getRegisterInfo();
- const TargetRegisterClass *orc = mri.getRegClass(reg);
- SmallPtrSet<const TargetRegisterClass*,8> rcs;
-
- for (MachineRegisterInfo::reg_nodbg_iterator I = mri.reg_nodbg_begin(reg),
- E = mri.reg_nodbg_end(); I != E; ++I) {
- // The targets don't have accurate enough regclass descriptions that we can
- // handle subregs. We need something similar to
- // TRI::getMatchingSuperRegClass, but returning a super class instead of a
- // sub class.
- if (I.getOperand().getSubReg()) {
- DEBUG(dbgs() << "Cannot handle subregs: " << I.getOperand() << '\n');
- return;
- }
- if (const TargetRegisterClass *rc =
- I->getDesc().getRegClass(I.getOperandNo(), tri))
- rcs.insert(rc);
- }
+ MachineRegisterInfo &MRI = MF.getRegInfo();
+ const TargetRegisterInfo *TRI = MF.getTarget().getRegisterInfo();
+ const TargetRegisterClass *OldRC = MRI.getRegClass(reg);
+ const TargetRegisterClass *NewRC = TRI->getLargestLegalSuperClass(OldRC);