* config/s390/s390-protos.h (s390_arg_frame_offset): Remove.
(s390_return_address_offset): Remove.
(s390_can_eliminate): Add prototype.
(s390_initial_elimination_offset): Add prototype.
* config/s390/s390.h (CAN_ELIMINATE): Call s390_can_eliminate.
(INITIAL_ELIMINATION_OFFSET): Call s390_initial_elimination_offset.
* config/s390/s390.c (s390_arg_frame_offset): Remove.
(s390_return_address_offset): Remove.
(s390_can_eliminate, s390_initial_elimination_offset): New functions.
(struct machine_function): New member split_branches_pending_p.
(s390_mainpool_start): Allow nonexistant pool insn for empty pool.
(s390_mainpool_finish): Likewise. Clear base_reg if pool empty.
(s390_optimize_prologue): Remove base_used argument. Call
s390_update_frame_layout instead of s390_register_info. Handle
prologue/epilogue insns that touch only RETURN_REGNUM.
(s390_reorg): Remove base_used. Clear split_branches_pending_p.
(s390_register_info): Remove base_used and return_addr_used
arguments, compute special register usage inline. Return live
register data to caller.
(s390_frame_info): Remove arguments, do not call s390_register_info.
(s390_init_frame_layout): New function.
(s390_update_frame_layout): Likewise.
(s390_emit_prologue): Call s390_update_frame_layout; some code
move to there. Do not emit pool placeholder insn if unnecessary.