[Bug tree-optimization/93667] [10 regression] ICE in esra with nested [[no_unique_address]] field

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93667

--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Martin Jambor <jamborm@gcc.gnu.org>:

https://gcc.gnu.org/g:665c5bad168ab63629b29ed2ce08ed042c088dc2

commit r10-6722-g665c5bad168ab63629b29ed2ce08ed042c088dc2
Author: Martin Jambor <mjambor@suse.cz>
Date:   Wed Feb 19 11:08:40 2020 +0100

    sra: Avoid totally scalarizing overallping field_decls (PR 93667)

    [[no_unique_address]] C++ attribute can cause two fields of a
    RECORD_TYPE overlap, which currently confuses the totally scalarizing
    code into creating invalid access tree.  For GCC 10, I'd like to
    simply disable total scalarization of types where this happens.

    For GCC 11 I'll write down a TODO item to enable total scalarization
    of cases like this where the problematic fields are basically empty -
    despite having a non-zero size - i.e. when they are just RECORD_TYPEs
    without any data fields.

    2020-02-19  Martin Jambor  <mjambor@suse.cz>

        gcc/

        PR tree-optimization/93667
        * tree-sra.c (scalarizable_type_p): Return false if record fields
        do not follow wach other.

        gcc/testsuite/

        PR tree-optimization/93667
        * g++.dg/tree-ssa/pr93667.C: New test.