[Bug tree-optimization/95185] Failure to optimize specific kind of sign comparison check

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95185

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
  _1 = x_4(D) >= 0;
  _2 = y_5(D) <= 0;
  _3 = _1 == _2;

Something like:
Prefer ^ over ==
```
(for cmp
(for cmpN
(for neeq
 (simplify
  (neeq:c (cmp @0 @1) @3
  (if (cmpN == inverseof(cmp, TREE_TYPE (type))
   (bit_xor (cmpN @0 @1) @3)
  )
 )
)))
```

This is what clang seems to do rather than any magic around == really.

I do wonder if we should try to expand bool == bool as bool^bool^1 .