- // If destination register has a sub-register index on it, make sure it
- // matches the instruction register class.
- if (DstSubIdx) {
- const MCInstrDesc &MCID = DefMI->getDesc();
- if (MCID.getNumDefs() != 1)
- return false;
- const TargetRegisterClass *DstRC = MRI->getRegClass(DstReg);
- const TargetRegisterClass *DstSubRC =
- DstRC->getSubRegisterRegClass(DstSubIdx);
- const TargetRegisterClass *DefRC = TII->getRegClass(MCID, 0, TRI);
- if (DefRC == DstRC)
- DstSubIdx = 0;
- else if (DefRC != DstSubRC)
- return false;
- }
-