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From: "malat at debian dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/111591] ppc64be: miscompilation with -mstrict-align /
 -O3
Date: Tue, 26 Sep 2023 09:31:10 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111591

--- Comment #11 from Mathieu Malaterre <malat at debian dot org> ---
(In reply to Kewen Lin from comment #6)
> Confirmed, thanks for reporting.
>=20
> I noticed that the reduced test case in #c1 can make gcc-13 complain with:
>=20
> test.cc:67:16: error: expected type-specifier before =E2=80=98__remove_re=
ference=E2=80=99
>    67 |   using type =3D __remove_reference(_Tp);
>       |                ^~~~~~~~~~~~~~~~~~
>=20
> Also gcc-12, gcc-11 build.
>=20
> Is it expected? If yes, could we have a reduced test case to survive for
> gcc-12 and gcc-11 compilation? I think it would help bisection.

`__remove_reference` must be something new in g++-13.

Anyway I started a cvise regression using g++-11 against g++-12. You can tr=
y on
your side:

g++-11 -std=3Dc++11 -o works -maltivec -mcpu=3Dpower8 -mstrict-align -g -O3
widen_mul_test.cc foo.cc -Wall -Wextra -Werror -Wfatal-errors

vs

g++-12 -std=3Dc++11 -o fails -maltivec -mcpu=3Dpower8 -mstrict-align -g -O3
widen_mul_test.cc foo.cc -Wall -Wextra -Werror -Wfatal-errors

For some reason if I copy/paste foo.cc into the main cc file (gnu::noipa) I=
 can
not reproduce the issue. So you'll have to download both *.cc files.

Thanks !=