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Subject: [Bug tree-optimization/104038] ranger infinite loop on a PHI
 statement while building Clang
Date: Tue, 18 Jan 2022 15:31:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104038

--- Comment #9 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Andrew Macleod <amacleod@gcc.gnu.org>:

https://gcc.gnu.org/g:254ada46ae0f21bd6f40314214f969f368328e22

commit r12-6678-g254ada46ae0f21bd6f40314214f969f368328e22
Author: Andrew MacLeod <amacleod@redhat.com>
Date:   Mon Jan 17 12:03:18 2022 -0500

    Limit the number of relations registered per basic block.

    In pathological cases, the number of transitive relations being added is
    potentially quadratic.  Lookups for relations in a block is linear in
    nature, so simply limit the number of relations to some reasonable numb=
er.

            PR tree-optimization/104038
            * doc/invoke.texi (relation-block-limit): New.
            * params.opt (relation-block-limit): New.
            * value-relation.cc (dom_oracle::register_relation): Check for =
NULL
            record before invoking transitive registery.
            (dom_oracle::set_one_relation): Check limit before creating rec=
ord.
            (dom_oracle::register_transitives): Stop when no record created.
            * value-relation.h (relation_chain_head::m_num_relations): New.=