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Subject: [Bug tree-optimization/101925] [10/11/12 Regression] reversed
 storage order when compiling with -O3 only since r10-4742-g9b75f56d4b7951c6
Date: Tue, 17 Aug 2021 07:25:25 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101925

--- Comment #10 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:0215b3559e55f39f38e10984a804c53907f7491c

commit r12-2939-g0215b3559e55f39f38e10984a804c53907f7491c
Author: Richard Biener <rguenther@suse.de>
Date:   Mon Aug 16 15:17:08 2021 +0200

    tree-optimization/101925 - fix VN with reverse storage order

    This fixes value-numbering breaking reverse storage order accesses
    due to a missed check.  It adds a new overload for
    reverse_storage_order_for_component_p and sets reversed on the
    VN IL ops for component and array accesses accordingly.
    It also compares the reversed reference ops flag on reference
    lookup.

    2021-08-16  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/101925
            * tree-ssa-sccvn.c (copy_reference_ops_from_ref): Set
            reverse on COMPONENT_REF and ARRAY_REF according to
            what reverse_storage_order_for_component_p does.
            (vn_reference_eq): Compare reversed on reference ops.
            (reverse_storage_order_for_component_p): New overload.
            (vn_reference_lookup_3): Check
reverse_storage_order_for_component_p
            on the reference looked up.

            * gcc.dg/sso-16.c: New testcase.=