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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/109644] Missing GIMPLE IL verification
Date: Fri, 28 Apr 2023 09:49:21 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109644

--- Comment #2 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:6e6f86f22873aab7059e083fd0c9905bd58e5efa

commit r14-324-g6e6f86f22873aab7059e083fd0c9905bd58e5efa
Author: Richard Biener <rguenther@suse.de>
Date:   Mon Apr 24 13:20:25 2023 +0200

    tree-optimization/109644 - missing IL checking

    We fail to verify the constraints under which we allow handled
    components to wrap registers.  The gcc.dg/pr70022.c testcase shows
    that we happily end up with

      _2 =3D VIEW_CONVERT_EXPR<int[4]>(v_1(D))

    as produced by SSA rewrite and update_address_taken.  But the intent
    was that we wrap registers with at most a single level of handled
    components and specifically only allow __real, __imag, BIT_FIELD_REF
    and VIEW_CONVERT_EXPR on them, but not ARRAY_REF or COMPONENT_REF.

    The following makes IL verification stricter which catches the
    problem.

            PR tree-optimization/109644
            * tree-cfg.cc (verify_types_in_gimple_reference): Check
            register constraints on the outermost VIEW_CONVERT_EXPR
            only.  Do not allow register or invariant bases on
            multi-level or possibly variable index handled components.=