[Bug tree-optimization/110134] [10/11/12/13/14 Regression] (-unsigned1) != CST is not optimized to unsigned1 != CST at the gimple level

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110134

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2023-06-06
             Status|UNCONFIRMED                 |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |pinskia at gcc dot 
gnu.org

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I have a simple patch.
TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0))
Can just be:
(cmp == EQ_EXPR || cmp == NE_EXPR || TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (@0)))

For /* -A CMP -B -> B CMP A.  */

Because -a == -b is still a == b, no matter what.