[Bug tree-optimization/114704] Missed optimization : eliminate store if the value is known in all predecessors

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114704

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2024-04-12
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed. A more general testcase:
```
void dummy();

void src(int *p, int a){
    int t = *p;
    if(t == a)
        goto then;
    else {
        dummy();
        t = *p;
        if(t == a)
            goto then;
        else
            return;
    }

then:
    *p = t; // *p is already a, it's dead now
}

```