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Subject: [Bug middle-end/38474] compile time explosion in
 dataflow_set_preserve_mem_locs at -O3
Date: Fri, 12 Feb 2021 11:42:49 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D38474

--- Comment #98 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:6cc886bf4279461b8931c4ca544185a85cd69f26

commit r11-7208-g6cc886bf4279461b8931c4ca544185a85cd69f26
Author: Richard Biener <rguenther@suse.de>
Date:   Fri Feb 12 11:13:36 2021 +0100

    middle-end/38474 - fix alias walk budget accounting in IPA analysis

    The walk_aliased_vdef calls do not update the walking budget until
    it is hit by a single call (and then in one case it resumes with
    no limit at all).  The following rectifies this in multiple places.
    It also makes the updates more consistend and fixes
    determine_known_aggregate_parts to account its own alias queries.

    2021-02-12  Richard Biener  <rguenther@suse.de>

            PR middle-end/38474
            * ipa-fnsummary.c (unmodified_parm_1): Only walk when
            fbi->aa_walk_budget is bigger than zero.  Update
            fbi->aa_walk_budget.
            (param_change_prob): Likewise.
            * ipa-prop.c (detect_type_change_from_memory_writes):
            Properly account walk_aliased_vdefs.
            (parm_preserved_before_stmt_p): Canonicalize updates.
            (parm_ref_data_preserved_p): Likewise.
            (parm_ref_data_pass_through_p): Likewise.
            (determine_known_aggregate_parts): Account own alias queries.=