if (TII->isMoveInstr(*DefMI, SrcReg, DstReg, SrcSubIdx, DstSubIdx) &&
TargetRegisterInfo::isVirtualRegister(SrcReg) &&
!SrcSubIdx && !DstSubIdx) {
- const TargetRegisterClass *SRC = MRI->getRegClass(SrcReg);
- const TargetRegisterClass *RC = MRI->getRegClass(Reg);
- if (SRC == RC || RC->hasSubClass(SRC)) {
- DEBUG(dbgs() << "Coalescing: " << *DefMI);
- DEBUG(dbgs() << "*** to: " << *MI);
- MO.setReg(SrcReg);
- DefMI->eraseFromParent();
- ++NumCoalesces;
- Changed = true;
- }
+ const TargetRegisterClass *SRC = MRI->getRegClass(SrcReg);
+ const TargetRegisterClass *RC = MRI->getRegClass(Reg);
+ const TargetRegisterClass *NewRC = getCommonSubClass(RC, SRC);
+ if (!NewRC)
+ continue;
+ DEBUG(dbgs() << "Coalescing: " << *DefMI);
+ DEBUG(dbgs() << "*** to: " << *MI);
+ MO.setReg(SrcReg);
+ if (NewRC != SRC)
+ MRI->setRegClass(SrcReg, NewRC);
+ DefMI->eraseFromParent();
+ ++NumCoalesces;
+ Changed = true;
}
}