[Bug tree-optimization/110949] New: ((cast)cmp) - 1 should be tranformed into (cast)cmp` where cmp` is the inverse of cmp

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110949

            Bug ID: 110949
           Summary: ((cast)cmp) - 1 should be tranformed into (cast)cmp`
                    where cmp` is the inverse of cmp
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

Take:
```
int f1(int a, int t)
{
  auto _6 = a == 115;
  auto _7 = (signed int) _6;
  return _6 - 1;
}
```
This should be the same as:
```
int f2(int a, int t)
{
  auto _6 = a != 115;
  auto _7 = (signed int) _6;
  return -_6;
}
```