extern rtx gen_lowpart_common PROTO((enum machine_mode, rtx));
extern rtx gen_lowpart PROTO((enum machine_mode, rtx));
extern rtx gen_lowpart_if_possible PROTO((enum machine_mode, rtx));
+extern rtx gen_highpart PROTO((enum machine_mode, rtx));
extern rtx operand_subword PROTO((rtx, int, int, enum machine_mode));
extern rtx operand_subword_force PROTO((rtx, int, enum machine_mode));
extern int subreg_lowpart_p PROTO((rtx));