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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/98069] [8/9/10/11 Regression] Miscompilation
 with -O3 since r8-2380-g2d7744d4ef93bfff
Date: Tue, 01 Dec 2020 08:33:00 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98069

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
The following fails with -O2 -ftree-vectorize


long long int var_3 =3D -166416893043554447LL;
short var_8 =3D (short)27092;
unsigned int var_17 =3D 75036300U;
short arr_165[23];

static long c(long e, long f) { return f ? e : f; }
void __attribute((noipa)) test()
{
  for (int b =3D 0; b < 19; b =3D var_17)
    for (int d =3D (int)(~c(-2147483647 - 1, var_3)) - 2147483647; d < 22; =
d++)
      arr_165[d] =3D var_8;
}

int main()
{
  for (unsigned i_3 =3D 0; i_3 < 23; ++i_3)
    arr_165[i_3] =3D (short)-8885;
  test();
  if (arr_165[0] !=3D 27092)
    __builtin_abort ();
  return 0;
}=