[Bug middle-end/31862] Loop IM and other optimizations harmful for -fopenmp

[bonzini at gnu dot org]

------- Comment #16 from bonzini at gnu dot org  2009-02-25 12:18 -------
The upcoming C++0x memory model forbids this; see
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2338.html (Concurrency
memory model compiler consequences).  But it says that this is acceptable
instead:

  tmp = var;
  modified = false;
  for (i = 0; i < 100; i++)
    {
      if (i > x)
        tmp = i, modified = true;
    }
  if (modified)
    var = tmp;

I think the bug can be confirmed, can't it?


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31862