[Bug d/110712] d: ICE: verify_gimple_failed (conversion of register to a different size in 'view_convert_expr')

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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110712

--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-12 branch has been updated by Iain Buclaw
<ibuclaw@gcc.gnu.org>:

https://gcc.gnu.org/g:77f7d469e923f2bb1d21d3875290ce738262d42b

commit r12-9951-g77f7d469e923f2bb1d21d3875290ce738262d42b
Author: Iain Buclaw <ibuclaw@gdcproject.org>
Date:   Sun Oct 29 20:13:14 2023 +0100

    d: Fix ICE: verify_gimple_failed (conversion of register to a different
size in 'view_convert_expr')

    Static arrays in D are passed around by value, rather than decaying to a
    pointer.  On x86_64 __builtin_va_list is an exception to this rule, but
    semantically it's still treated as a static array.

    This makes certain assignment operations fail due a mismatch in types.
    As all examples in the test program are rejected by C/C++ front-ends,
    these are now errors in D too to be consistent.

            PR d/110712

    gcc/d/ChangeLog:

            * d-codegen.cc (d_build_call): Update call to convert_for_argument.
            * d-convert.cc (is_valist_parameter_type): New function.
            (check_valist_conversion): New function.
            (convert_for_assignment): Update signature.  Add check whether
            assigning va_list is permissible.
            (convert_for_argument): Likewise.
            * d-tree.h (convert_for_assignment): Update signature.
            (convert_for_argument): Likewise.
            * expr.cc (ExprVisitor::visit (AssignExp *)): Update call to
            convert_for_assignment.

    gcc/testsuite/ChangeLog:

            * gdc.dg/pr110712.d: New test.

    (cherry picked from commit ea8ffdcadb388b531adf4772287e7987a82a84b7)