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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/111445] [12/13/14 Regression] Wrong code at
 -Os on x86_64-linux-gnu since r12-1077-g57bf3751511
Date: Fri, 20 Oct 2023 12:04:36 +0000
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X-Bugzilla-Component: tree-optimization
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X-Bugzilla-Keywords: wrong-code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111445

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
For the testsuite, not fixed by the fix for PR110243:

/* { dg-do run } */

extern void abort (void);
short a, b;
unsigned char c =3D 255;
unsigned cnt;
void __attribute__((noipa))
check (int x)
{
  if (x !=3D 0)
    abort ();
  cnt++;
}
int main()=20
{=20
  int d;
  unsigned char e;
  d =3D 0;=20
  for (; a >=3D 0; a--) {
    int *f =3D &d;
    *f =3D c;
  }=20
  e =3D 0;=20
  for (; (unsigned char)(d - 255) + e <=3D 1; e++)
    check (b);
  if (cnt !=3D 2)
    abort ();
  return 0;
}=