[Bug c/111887] New: GCC: 14: A potential miscompilation with __builtin_inf

[141242068 at smail dot nju.edu.cn via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111887

            Bug ID: 111887
           Summary: GCC: 14: A potential miscompilation with __builtin_inf
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: 141242068 at smail dot nju.edu.cn
  Target Milestone: ---

I am uncertain whether this program contains undefined behavior, the testcase
is:
```
extern void abort (void);

void test(double f, double i)
{
  if (i != __builtin_inf())
    abort ();
}

int main()
{
  test (34.0, __builtin_inf());
  return 0;
}

```

When compile it with -O0, -O1, -O2, the program normally exits, but when
compile it with -Ofast, the program abort.

Here is the verification link: https://gcc.godbolt.org/z/7YKbvha84