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[Matthias Klose <doko@xxxxxxxxxx>]

this is fixed in trusty-updates

** Changed in: gcc-4.8 (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1432250

Title:
  [4.7 Regression] Wrong optimization with -O2

Status in gcc-4.8 package in Ubuntu:
  Fix Released

Bug description:
  As reported by Mike  Mirzayanov on GCC Bugzilla:
  See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60766 and http://codeforces.com/blog/entry/11450
  Ubuntu 14.04 includes GCC 4.8.2 which is affected with bug.
  Please upgrade to GCC 4.8.3 or later  in which the bug is fixed.
  "
  Compile with -O2 and input 9

  Compile the following code with -O2:

  ~~~~~
  #include <cstdlib>
  #include <iostream>
  #include <cstdio>

  using namespace std;

  int main() {
      int n;
      cin >> n;

      for (int x = 0; x <= n; x++) {
          if (n == x + (x + 1) + (x + 2)) {
              cout << x + 2 << " " << x + 1 << " " << x << endl;
              exit(0);
          }
      }
      cout << -1 << endl;
      return 0;
  }
  ~~~~~

  Start binary and enter 9

  It will print "-1", but expected output is "4 3 2".
  "

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