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From: "rguenth 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 12:50:12 +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 #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
Somewhat more reduced:

typedef __UINT64_TYPE__ uint64_t;

static uint64_t g_1731[7] =3D {0xF75EE82FC4736923LL, 0, 0xF75EE82FC4736923L=
L, 0,
    0xF75EE82FC4736923LL, 0, 0xF75EE82FC4736923LL};

void __attribute__((noipa)) foo ()
{
  uint64_t l_1930[5] =3D { 0x5e44d2fed3bca5f2, 0x5e44d2fed3bca5f2,=20
      0x5e44d2fed3bca5f2, 0x5e44d2fed3bca5f2, 0x5e44d2fed3bca5f2 };

  for (int i =3D 0; i < 15; ++i)
    for (int j =3D 4; (j >=3D 1); j -=3D 1)
#pragma GCC unroll 0
      for (int k =3D 0; (k <=3D 4); k +=3D 1)
        g_1731[(j + 1)] &=3D (0x26L & (--l_1930[k]));
}

int main()
{
  foo ();
  /* f75ee82fc4736923 0 2 0 0 0 f75ee82fc4736923 */
  if (g_1731[0] !=3D 0xF75EE82FC4736923LL
      || g_1731[2] !=3D 2
      || g_1731[4] !=3D 0
      || g_1731[6] !=3D 0xF75EE82FC4736923LL)
    __builtin_abort ();
  return 0;
}=