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Subject: [Bug target/102024] [12 Regression] zero width bitfields and ABIs
Date: Thu, 23 Sep 2021 12:40:42 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102024

--- Comment #16 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by William Schmidt <wschmidt@gcc.gnu.org=
>:

https://gcc.gnu.org/g:16e3d6b8b2b5168ebc773833f0e7ccf2191932c1

commit r12-3843-g16e3d6b8b2b5168ebc773833f0e7ccf2191932c1
Author: Bill Schmidt <wschmidt@linux.ibm.com>
Date:   Thu Sep 23 07:35:42 2021 -0500

    rs6000: Add psabi diagnostic for C++ zero-width bit field ABI change

    Previously zero-width bit fields were removed from structs, so that
otherwise
    homogeneous aggregates were treated as such and passed in FPRs and VSRs.
    This was incorrect behavior per the ELFv2 ABI.  Now that these fields a=
re
no
    longer being removed, we generate the correct parameter passing code.=20
Alert
    the unwary user in the rare cases where this behavior changes.

    2021-09-23  Bill Schmidt  <wschmidt@linux.ibm.com>

    gcc/
            PR target/102024
            * config/rs6000/rs6000-call.c (rs6000_aggregate_candidate): Det=
ect
            zero-width bit fields and return indicator.
            (rs6000_discover_homogeneous_aggregate): Diagnose when the
            presence of a zero-width bit field changes parameter passing in
            GCC 12.

    gcc/testsuite/
            PR target/102024
            * g++.target/powerpc/pr102024.C: New.=