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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/53239] [4.7 Regression] VRP vs named value return opt
Date: Fri, 04 May 2012 22:03:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53239

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |wrong-code
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2012-05-04
          Component|c++                         |middle-end
            Summary|[4.7 Regression] -ftree-vrp |[4.7 Regression] VRP vs
                   |breaks min()                |named value return opt
     Ever Confirmed|0                           |1

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-05-04 22:02:59 UTC ---
Actually the following is what is being removed:
  if (D.36751_45 < 0)
    goto <bb 6>;
  else
    goto <bb 7>;

<bb 6>:

<bb 7>:
  # D.36747_44 = PHI <<retval>_2(D)(6), &D.35100(5)>

So it is not VRP really as it is doing something fine.  It is just we say
<retval>_2 is uninitialized.