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* doc/rtl.texi (simple_return): Document. (parallel, PATTERN): Here too. * doc/md.texi (return): Mention it's allowed to expand to simple_return in some cases. (simple_return): Document standard pattern. * gengenrtl.c (special_rtx): SIMPLE_RETURN is special. * final.c (final_scan_insn): Use ANY_RETURN_P on body. * reorg.c (function_return_label, function_simple_return_label): New static variables, replacing... (end_of_function_label): ... this. (simplejump_or_return_p): New static function. (optimize_skip, steal_delay_list_from_fallthrough, fill_slots_from_thread): Use it. (relax_delay_slots): Likewise. Use ANY_RETURN_P on body. (rare_destination, follow_jumps): Use ANY_RETURN_P on body. (find_end_label): Take a new arg which is one of the two return rtxs. Depending on which, set either function_return_label or function_simple_return_label. All callers changed. (make_return_insns): Make both kinds. (dbr_schedule): Adjust for two kinds of end labels. * function.c (emit_return_into_block): Set JUMP_LABEL properly. * genemit.c (gen_exp): Handle SIMPLE_RETURN. (gen_expand, gen_split): Use ANY_RETURN_P. * df-scan.c (df_uses_record): Handle SIMPLE_RETURN. * rtl.def (SIMPLE_RETURN): New code. * ifcvt.c (find_if_case_1): Be more careful about redirecting jumps to the EXIT_BLOCK. * jump.c (condjump_p, condjump_in_parallel_p, any_condjump_p, returnjump_p_1): Handle SIMPLE_RETURNs. * print-rtl.c (print_rtx): Likewise. * rtl.c (copy_rtx): Likewise. * bt-load.c (compute_defs_uses_and_gen): Use ANY_RETURN_P. * combine.c (simplify_set): Likewise. * resource.c (find_dead_or_set_registers, mark_set_resources): Likewise. * emit-rtl.c (verify_rtx_sharing, classify_insn, copy_insn_1, copy_rtx_if_shared_1, mark_used_flags): Handle SIMPLE_RETURNs. (init_emit_regs): Initialize simple_return_rtx. * cfglayout.c (fixup_reorder_chain): Pass a JUMP_LABEL to force_nonfallthru_and_redirect. * rtl.h (ANY_RETURN_P): Allow SIMPLE_RETURN. (GR_SIMPLE_RETURN): New enum value. (simple_return_rtx): New macro. * basic-block.h (force_nonfallthru_and_redirect): Adjust declaration. * cfgrtl.c (force_nonfallthru_and_redirect): Take a new jump_label argument. All callers changed. Be careful about what kinds of returnjumps to generate. * config/i386/3i86.c (ix86_pad_returns, ix86_count_insn_bb, ix86_pad_short_function): Likewise. * config/arm/arm.c (arm_final_prescan_insn): Handle both kinds of return. * config/mips/mips.md (any_return): New code_iterator. (optab): Add cases for return and simple_return. (return): Expand to a simple_return. (simple_return): New pattern. (*<optab>, *<optab>_internal for any_return): New patterns. (return_internal): Remove. * config/mips/mips.c (mips_expand_epilogue): Make the last insn a simple_return_internal. From-SVN: r178135
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