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Subject: [Bug c++/100281] ICE with SImode pointer assignment in C++
Date: Tue, 18 May 2021 06:45:48 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100281

--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Andreas Krebbel <krebbel@gcc.gnu.org>:

https://gcc.gnu.org/g:720dff974ea0487c35c0a4bfa527f30df5066ce1

commit r12-857-g720dff974ea0487c35c0a4bfa527f30df5066ce1
Author: Andreas Krebbel <krebbel@linux.ibm.com>
Date:   Tue Apr 27 10:09:06 2021 +0200

    PR100281 C++: Fix SImode pointer handling

    The problem appears to be triggered by two locations in the front-end
    where non-POINTER_SIZE pointers aren't handled right now.

    1. An assertion in strip_typedefs is triggered because the alignment
    of the types don't match. This in turn is caused by creating the new
    type with build_pointer_type instead of taking the type of the
    original pointer into account.

    2. An assertion in cp_convert_to_pointer is triggered which expects
    the target type to always have POINTER_SIZE.

    gcc/cp/ChangeLog:

            PR c++/100281
            * cvt.c (cp_convert_to_pointer): Use the size of the target
            pointer type.
            * tree.c (cp_build_reference_type): Call
            cp_build_reference_type_for_mode with VOIDmode.
            (cp_build_reference_type_for_mode): Rename from
            cp_build_reference_type.  Add MODE argument and invoke
            build_reference_type_for_mode.
            (strip_typedefs): Use build_pointer_type_for_mode and
            cp_build_reference_type_for_mode for pointers and references.

    gcc/ChangeLog:

            PR c++/100281
            * tree.c (build_reference_type_for_mode)
            (build_pointer_type_for_mode): Pick pointer mode if MODE argume=
nt
            is VOIDmode.
            (build_reference_type, build_pointer_type): Invoke
            build_*_type_for_mode with VOIDmode.

    gcc/testsuite/ChangeLog:

            PR c++/100281
            * g++.target/s390/pr100281-1.C: New test.
            * g++.target/s390/pr100281-2.C: New test.=