DRn
DRn = DRm;
EMU_FLOAT_X(D, DRn);
EMU_FTRC_X(D, DRn);
PACK_D(DRn, Fr);
UNPACK_D(Fn, DRn);
FP_DECL_EX; if(FPSCR_PR) op(D,x,DRm,DRn); else op(S,x,FRm,FRn);