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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/98513] [10/11 Regression] Wrong code with -O3
 since r10-2804-gbf05a3bbb58b3558
Date: Tue, 05 Jan 2021 16:40:07 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98513

--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
void __attribute__((noipa))
foo (int x, int minus_1)
{
  int tem =3D minus_1;
  tem =3D tem + 2;
  if ((unsigned)x + 2147483647 >=3D 2)
    {
      if (x <=3D tem)
        {
          if (x > 5)
            __builtin_exit (0);
        }
    }
}
int
main()
{
  foo (10, 100);
  __builtin_abort ();
}

fails with -O2 -fdisable-tree-ccp1 -fdisable-tree-forwprop1 -fdisable-tree-=
fre1
I'll turn it into a GIMPLE FE unit testcase for EVRP tomorrow.  Interesting=
ly
the intersect with [-INF, minus_1_29(D) + 1] works fine (x < tem vs. x <=3D=
 tem).=