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From: "dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/109031] csmith: possible bad code with -O2
 -fno-strict-aliasing
Date: Wed, 08 Mar 2023 13:39:30 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109031

--- Comment #9 from David Binderman <dcb314 at hotmail dot com> ---
(In reply to Martin Li=C5=A1ka from comment #8)
> > but then if diff returns 1, the script should return 0 and
> > if diff returns 0, then the script should return 1.
>=20
> You can take an inspiration here:
> https://github.com/marxin/gcc-util/blob/master/bisect/reduce.sh

Thanks for that. I am a bit further forward and I have this cvise
script:

/usr/bin/gcc -w -Werror=3Dimplicit bug892.c -o one.exe
        && (./one.exe 1 | fgrep "checksum after hashing g_50 :" > 1)=20
        && /home/dcb36/gcc/results/bin/gcc -w -O2 -fno-strict-aliasing bug8=
92.c=20
 -o two.exe
        && (./two.exe 1 | fgrep "checksum after hashing g_50 :" > 2)=20
        && diff 1 2;=20
        if test $? =3D 0; then=20
                exit 1
        fi
                exit 0

It still doesn't work right and I can't fathom what's wrong.
It all works nicely when I do it line by line.=