[Bug tree-optimization/115474] Missed optimization: fold `std::max(a > b, a)` to `a` (bool a, bool b)

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115474

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
     Ever confirmed|0                           |1
           Assignee|unassigned at gcc dot gnu.org      |pinskia at gcc dot 
gnu.org
                 CC|                            |pinskia at gcc dot gnu.org
   Last reconfirmed|                            |2024-06-13

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed, there are at least 2 forms that need to be optimized (note MIN/MAX
here is gone already due to zero_one optimizations):

-O2:
  _2 = b_5(D) < a_7(D); // a & !b
  _1 = _2 < a_7(D); // !(a & !b) & a -> (!a | b) & a -> a & b
  _8 = _1 | _2; // (a & b) | (a & !b) -> a

-O1:
  _2 = b_4(D) < a_7(D);  // a & !b
  _6 = _2 | a_7(D); // (a & !b) | a -> a


Let me handle those.

Note there is some more with <=/>/>= too.