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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/109184] [10/11/12/13 Regression] csmith: 2017
 bug with -floop-interchange
Date: Mon, 20 Mar 2023 12:46:26 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: wrong-code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109184

--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
I've tried to deobfuscate the innermost loop's body:
                        int32_t l_1942 =3D (-3L);
                        int32_t *****l_1947 =3D &l_1946[0][6];
                        int i, j;
                        uint64_t t1 =3D --l_1930[g_1179];
                        t1 +=3D 0xFC07342370A5FE25ULL;
                        t1 &=3D 38;
                        uint64_t t2 =3D (g_1731[l_1719 + 1][l_1721] &=3D t1=
);
                        l_1942 ^=3D (t2 + 4ULL <=3D p_5.f0);
                        l_1943[0][1][1]++;
                        int32_t ****t3 =3D l_1946[0][6];
                        *l_1947 =3D t3;
                        l_1949 =3D t3 =3D=3D g_1948;=