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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/113291] [14/15 Regression] compilation never (?) finishes
 with recursive always_inline functions at -O and above since r14-2172
Date: Tue, 14 May 2024 10:59:31 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113291

--- 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 i=
dea
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 detec=
ted.

    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 genera=
lity
    when indirect calls and other tricks may happen.

    gcc/ChangeLog:

            PR ipa/113291

            * ipa-inline.cc (enum can_inline_edge_by_limits_flags): New enu=
m.
            (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 m=
ode.
            (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.=