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From: "jlame646 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/114290] New: GCC output incorrect output with -O2
Date: Sat, 09 Mar 2024 09:52:30 +0000
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X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 14.0
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114290

            Bug ID: 114290
           Summary: GCC output incorrect output with -O2
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jlame646 at gmail dot com
  Target Milestone: ---

The following program gives wrong output `0` with `-O2` for input `2`. When
`f(1,1)` is commented out(or removed) it produces correct output.
https://godbolt.org/z/3rxah7Grx

```
#include <cstdio>
#include <iostream>
struct Node {
    int x;
};
Node f(int A, int B) {
    if (A < 0) return {0};
    return {A / B + (A % B !=3D 0)};
}
Node g(int C, int D) {
    if (C > 0) return {0};
    return {C / D + (C % D !=3D 0)};
}
int main() {
    int n;

    std::cin >> n;
    f(1, 1); //commenting this line fixes the issue
    Node t =3D g(-1, n);

    std::cout << t.x;
}=20
```=