lib/CodeGen/RegisterCoalescer.cpp

392                                        unsigned &Dst, unsigned &SrcSub,
398     SrcSub = MI->getOperand(1).getSubReg();
404     SrcSub = MI->getOperand(2).getSubReg();
432   unsigned Src, Dst, SrcSub, DstSub;
433   if (!isMoveInstr(TRI, MI, Src, Dst, SrcSub, DstSub))
435   Partial = SrcSub || DstSub;
442     std::swap(SrcSub, DstSub);
456     // Eliminate SrcSub by picking a corresponding Dst superregister.
457     if (SrcSub) {
458       Dst = TRI.getMatchingSuperReg(Dst, SrcSub, MRI.getRegClass(Src));
469     if (SrcSub && DstSub) {
471       if (Src == Dst && SrcSub != DstSub)
474       NewRC = TRI.getCommonSuperRegClass(SrcRC, SrcSub, DstRC, DstSub,
482     } else if (SrcSub) {
484       DstIdx = SrcSub;
485       NewRC = TRI.getMatchingSuperRegClass(SrcRC, DstRC, SrcSub);
526   unsigned Src, Dst, SrcSub, DstSub;
527   if (!isMoveInstr(TRI, MI, Src, Dst, SrcSub, DstSub))
533     std::swap(SrcSub, DstSub);
547     if (!SrcSub)
550     return TRI.getSubReg(DstReg, SrcSub) == Dst;
556     return TRI.composeSubRegIndices(SrcIdx, SrcSub) ==