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* 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. From-SVN: r88357
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