[Bug tree-optimization/113339] New: `-a/-b` is not simplified to `a/b` if done in seperate statements

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113339

            Bug ID: 113339
           Summary: `-a/-b` is not simplified to `a/b` if done in seperate
                    statements
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

Take:
```
int unopt(int a, int b) {
   a = -a;
   b = -b;
    return a / b;
}
int opt(int a, int b) {
    return -a / -b;
}
```
I would have expected these 2 would produce the same assembly but only opt is
optimized to a/b and the neg is removed.

Note LLVM does not do either: https://github.com/llvm/llvm-project/issues/77717
.