[Bug tree-optimization/111882] [13 Regression] : internal compiler error: in get_expr_operand in ifcvt with Variable length arrays and bitfields inside a struct

["cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111882

--- Comment #7 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-13 branch has been updated by Richard Ball
<ricbal02@gcc.gnu.org>:

https://gcc.gnu.org/g:4950f6bcd3cce9deb630b76af42cd6d6968ba03f

commit r13-8678-g4950f6bcd3cce9deb630b76af42cd6d6968ba03f
Author: Andre Vieira <andre.simoesdiasvieira@arm.com>
Date:   Fri Oct 20 17:02:32 2023 +0100

    ifcvt: Don't lower bitfields with non-constant offsets [PR 111882]

    This patch stops lowering of bitfields by ifcvt when they have non-constant
    offsets as we are not likely to be able to do anything useful with those
during
    vectorization.  That also fixes the issue reported in PR 111882, which was
    being caused by an offset with a side-effect being lowered, but constants
have
    no side-effects so we will no longer run into that problem.

    gcc/ChangeLog:

            PR tree-optimization/111882
            * tree-if-conv.cc (get_bitfield_rep): Return NULL_TREE for
bitfields
            with non-constant offsets.

    gcc/testsuite/ChangeLog:

            * gcc.dg/vect/pr111882.c: New test.

    (cherry picked from commit 24cf1f600b8ad34c68a51f48884e72d01f729893)