[Bug tree-optimization/87849] Missed optimization: useless for-loop must be eliminated

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87849

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2018-11-02
                 CC|                            |matz at gcc dot gnu.org
          Component|c++                         |tree-optimization
            Version|tree-ssa                    |9.0
     Ever confirmed|0                           |1

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.  I think the only realistic way to prove this is to fuse the loops
and then see

 l = max(min(l, x), x);

Thus - loop fusion required.