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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: Mon, 25 Sep 2023 11:55:36 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111591

--- Comment #1 from Mathieu Malaterre <malat at debian dot org> ---
Created attachment 55989
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D55989&action=3Dedit
cvise reduced test case

% g++ -std=3Dc++11 -o works -DHWY_COMPILE_ONLY_EMU128 -DHWY_BROKEN_EMU128=
=3D0
-maltivec -mcpu=3Dpower8  -g -O3 alt.cc  -Wall -Wextra -Werror -Wfatal-erro=
rs

% g++ -std=3Dc++11 -o fails -DHWY_COMPILE_ONLY_EMU128 -DHWY_BROKEN_EMU128=
=3D0
-maltivec -mcpu=3Dpower8 -mstrict-align -g -O3 alt.cc  -Wall -Wextra -Werror
-Wfatal-errors

should give:

% ./works
-> success

but:

% ./fails=20
fails: alt.cc:395: void hwy::detail::AssertArrayEqual(const TypeInfo&, const
void*, const void*, size_t, const char*, const char*, int): Assertion
`memcmp(a, b, c * ti.sizeof_t) =3D=3D 0' failed.
zsh: abort      ./fails=