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Subject: [Bug c++/114537] bit_cast does not work NSDMI of bitfields
Date: Tue, 11 Jun 2024 10:37:44 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114537

--- Comment #7 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-12 branch has been updated by Jakub Jelinek
<jakub@gcc.gnu.org>:

https://gcc.gnu.org/g:42afabb838d511f5feb150bfa4e68b5880aae1fa

commit r12-10518-g42afabb838d511f5feb150bfa4e68b5880aae1fa
Author: Jakub Jelinek <jakub@redhat.com>
Date:   Thu Apr 4 10:47:52 2024 +0200

    fold-const: Handle NON_LVALUE_EXPR in native_encode_initializer [PR1145=
37]

    The following testcase is incorrectly rejected.  The problem is that
    for bit-fields native_encode_initializer expects the corresponding
    CONSTRUCTOR elt value must be INTEGER_CST, but that isn't the case
    here, it is wrapped into NON_LVALUE_EXPR by maybe_wrap_with_location.
    We could STRIP_ANY_LOCATION_WRAPPER as well, but as all we are looking =
for
    is INTEGER_CST inside, just looking through NON_LVALUE_EXPR seems easie=
r.

    2024-04-04  Jakub Jelinek  <jakub@redhat.com>

            PR c++/114537
            * fold-const.cc (native_encode_initializer): Look through
            NON_LVALUE_EXPR if val is INTEGER_CST.

            * g++.dg/cpp2a/bit-cast16.C: New test.

    (cherry picked from commit 1baec8deb014b8a7da58879a407a4c00cdeb5a09)=