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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/114998] [14/15 Regression] ICE on valid code
 at -O3 with "-fno-tree-dce" on x86_64-linux-gnu: Segmentation fault
Date: Thu, 09 May 2024 08:05:30 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114998

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
            Summary|ICE on valid code at -O3    |[14/15 Regression] ICE on
                   |with "-fno-inline           |valid code at -O3 with
                   |-fno-tree-dce -fno-ipa-cp"  |"-fno-tree-dce" on
                   |on x86_64-linux-gnu:        |x86_64-linux-gnu:
                   |Segmentation fault          |Segmentation fault
   Last reconfirmed|                            |2024-05-09
   Target Milestone|---                         |14.2
     Ever confirmed|0                           |1

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed. here is a testcase with only `-O3 -fno-tree-dce` as this basical=
ly
does what `-fno-inline` and `-fno-ipa-cp` cause:
```
short a, d;
int b, c, f, g, h, i, j[2], o;
__attribute__((const)) int s(char r);
int main() {
  int l, m, k, n;
  if (b) {
    char p;
    for (; p >=3D 0; p--) {
      int e[] =3D {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
                 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0,
                 1, 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 1,
                 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0};
      if (j[p]) {
        int q[1];
        i =3D o;
        o =3D q[h];
        if (g)
          n =3D d;
        m =3D 4;
        for (; m; m--) {
          if (l)
            k |=3D c;
          if (a)
            break;
        }
      }
      s(n);
      f |=3D b;
    }
  }
  return 0;
}
```=