[Bug tree-optimization/111640] Missed optimization of Loop Unswitch (Simple loops)

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111640

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |INVALID
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
If we change the for loop to be:
for (int i_0 = 0; i_0 < 4 + -1; i_0 +=  1)

Then it unswitches.

Or just use  -fwrapv which makes the undefined code to become defined.