lib/CodeGen/RegisterCoalescer.cpp

343     const TargetRegisterClass *DstRC = MRI.getRegClass(Dst);
351       NewRC = TRI.getCommonSuperRegClass(SrcRC, SrcSub, DstRC, DstSub,
358       NewRC = TRI.getMatchingSuperRegClass(DstRC, SrcRC, DstSub);
362       NewRC = TRI.getMatchingSuperRegClass(SrcRC, DstRC, SrcSub);
365       NewRC = TRI.getCommonSubClass(DstRC, SrcRC);
380     CrossClass = NewRC != DstRC || NewRC != SrcRC;
959       const TargetRegisterClass *DstRC = MRI->getRegClass(DstReg);
961         TRI->getCommonSubClass(DefRC, DstRC);
1280     auto DstRC = MRI->getRegClass(CP.getDstReg());
1285       std::swap(SrcRC, DstRC);
1287     if (!TRI->shouldCoalesce(CopyMI, SrcRC, SrcIdx, DstRC, DstIdx,