| derivatives of this routine.
| get_fline: get user's opcode word
| g_dfmtou: returns the destination format.
| g_opcls: returns the opclass of the float instruction.
| derivatives of this routine.
| get_fline: get user's opcode word
| g_dfmtou: returns the destination format.
| g_opcls: returns the opclass of the float instruction.