unsigned SrcReg = Copy.getOperand(1).getReg();
unsigned SrcSubReg = Copy.getOperand(1).getSubReg();
const TargetRegisterClass *DstRC = MRI.getRegClass(DstReg);
+ const TargetRegisterClass *SrcRC;
if (!TargetRegisterInfo::isVirtualRegister(SrcReg) ||
DstRC == &AMDGPU::M0RegRegClass)
return false;
- const TargetRegisterClass *SrcRC = TRI->getSubRegClass(
- MRI.getRegClass(SrcReg), SrcSubReg);
-
- return TRI->isSGPRClass(DstRC) &&
- !TRI->getCommonSubClass(DstRC, SrcRC);
+ SrcRC = inferRegClassFromDef(TRI, MRI, SrcReg, SrcSubReg);
+ return TRI->isSGPRClass(DstRC) && TRI->hasVGPRs(SrcRC);
}
bool SIFixSGPRCopies::runOnMachineFunction(MachineFunction &MF) {