[Bug tree-optimization/78542] [7 Regression] wrong code at -Og results in endless loop

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78542

Marc Glisse <glisse at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2016-11-26
   Target Milestone|---                         |7.0
     Ever confirmed|0                           |1

--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> ---
Indeed. CCP4 says

Visiting PHI node: x_4 = PHI <x_6(D)(2), 1(3)>

    Argument #0 (2 -> 3 executable)
        x_6(D)  Value: CONSTANT x_6(D)

    Argument #1 (3 -> 3 not executable)

    PHI node value: CONSTANT x_6(D)

and then proceeds with x_4 = x_6.