[Bug ipa/113291] [14/15 Regression] compilation never (?) finishes with recursive always_inline functions at -O and above since r14-2172

["cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113291

--- Comment #10 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jan Hubicka <hubicka@gcc.gnu.org>:

https://gcc.gnu.org/g:1ec49897253e093e1ef6261eb104ac0c111bac83

commit r15-482-g1ec49897253e093e1ef6261eb104ac0c111bac83
Author: Jan Hubicka <jh@suse.cz>
Date:   Tue May 14 12:58:56 2024 +0200

    Reduce recursive inlining of always_inline functions

    this patch tames down inliner on (mutiply) self-recursive always_inline
functions.
    While we already have caps on recursive inlning, the testcase combines
early inliner
    and late inliner to get very wide recursive inlining tree.  The basic idea
is to
    ignore DISREGARD_INLINE_LIMITS when deciding on inlining self recursive
functions
    (so we cut on function being large) and clear the flag once it is detected.

    I did not include the testcase since it still produces a lot of code and
would
    slow down testing.  It also outputs many inlining failed messages that is
not
    very nice, but it is hard to detect self recursin cycles in full generality
    when indirect calls and other tricks may happen.

    gcc/ChangeLog:

            PR ipa/113291

            * ipa-inline.cc (enum can_inline_edge_by_limits_flags): New enum.
            (can_inline_edge_by_limits_p): Take flags instead of multiple
bools; add flag
            for forcing inlinie limits.
            (can_early_inline_edge_p): Update.
            (want_inline_self_recursive_call_p): Update; use FORCE_LIMITS mode.
            (check_callers): Update.
            (update_caller_keys): Update.
            (update_callee_keys): Update.
            (recursive_inlining): Update.
            (add_new_edges_to_heap): Update.
            (speculation_useful_p): Update.
            (inline_small_functions): Clear DECL_DISREGARD_INLINE_LIMITS on
self recursion.
            (flatten_function): Update.
            (inline_to_all_callers_1): Update.