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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/111779] Fail to vectorize the struct include
 struct
Date: Fri, 13 Oct 2023 06:34:53 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111779

--- Comment #4 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:6decda1a35be5764101987c210b5693a0d914e58

commit r14-4612-g6decda1a35be5764101987c210b5693a0d914e58
Author: Richard Biener <rguenther@suse.de>
Date:   Thu Oct 12 11:34:57 2023 +0200

    tree-optimization/111779 - Handle some BIT_FIELD_REFs in SRA

    The following handles byte-aligned, power-of-two and byte-multiple
    sized BIT_FIELD_REF reads in SRA.  In particular this should cover
    BIT_FIELD_REFs created by optimize_bit_field_compare.

    For gcc.dg/tree-ssa/ssa-dse-26.c we now SRA the BIT_FIELD_REF
    appearing there leading to more DSE, fully eliding the aggregates.

    This results in the same false positive -Wuninitialized as the
    older attempt to remove the folding from optimize_bit_field_compare,
    fixed by initializing part of the aggregate unconditionally.

            PR tree-optimization/111779
    gcc/
            * tree-sra.cc (sra_handled_bf_read_p): New function.
            (build_access_from_expr_1): Handle some BIT_FIELD_REFs.
            (sra_modify_expr): Likewise.
            (make_fancy_name_1): Skip over BIT_FIELD_REF.

    gcc/fortran/
            * trans-expr.cc (gfc_trans_assignment_1): Initialize
            lhs_caf_attr and rhs_caf_attr codimension flag to avoid
            false positive -Wuninitialized.

    gcc/testsuite/
            * gcc.dg/tree-ssa/ssa-dse-26.c: Adjust for more DSE.
            * gcc.dg/vect/vect-pr111779.c: New testcase.=