https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67830

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2015-10-05
          Component|rtl-optimization            |tree-optimization
   Target Milestone|---                         |6.0
            Summary|wrong code at -O1 and above |[6 Regression] wrong code
                   |on x86_64-linux-gnu         |at -O1 and above on
                   |                            |x86_64-linux-gnu
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.  .optimized already has an unconditional abort() call and forwprop2
changes it to that.

Applying pattern match.pd:2322, gimple-match.c:2002
gimple_simplified to _15 = d.2_9 - _5;
_16 = _15 & 254;
_12 = (int) _16;
Applying pattern match.pd:1853, generic-match.c:5128
  Replaced '_12 != -2' with '1'
gimple_simplified to if (1 != 0)

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