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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/112732] during IPA pass: *free_lang_data ICE: 'verify_type'
 failed: type variant with 'TYPE_ALIAS_SET_KNOWN_P' with -Os
 -Wstrict-aliasing=2 -flto
Date: Tue, 28 Nov 2023 11:35:14 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112732

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot =
gnu.org
           Keywords|                            |ice-checking
                 CC|                            |hubicka at gcc dot gnu.org
             Status|NEW                         |ASSIGNED

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
The vector type is built as a distinct type copy from a vector type that has
the alias set already set (by the diagnostic code).

#0  0x0000000001adac14 in build_opaque_vector_type (
    innertype=3D<integer_type 0x7ffff6a2b9d8 __int128>, nunits=3D...)
    at /home/rguenther/src/trunk/gcc/tree.cc:10271
#1  0x0000000000d97c7c in build_binary_op (location=3D279873, code=3DEQ_EXP=
R,=20
    orig_op0=3D<var_decl 0x7ffff6a19cf0 w>,=20
    orig_op1=3D<var_decl 0x7ffff6a19d80 d>, convert_p=3Dtrue)
    at /home/rguenther/src/trunk/gcc/c/c-typeck.cc:12617
#2  0x0000000000d7230f in parser_build_binary_op (location=3D279873,=20
    code=3DEQ_EXPR, arg1=3D..., arg2=3D...)
    at /home/rguenther/src/trunk/gcc/c/c-typeck.cc:3766

I think given this checking that build_opaque_vector_type should clear
TYPE_ALIAS_SET.=