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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/49103] [4.6/4.7 Regression] local variables exchange values / wrong code with -O3
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49103

Tobias Burnus <burnus at gcc dot gnu.org> changed:

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--- Comment #9 from Tobias Burnus <burnus at gcc dot gnu.org> 2011-05-28 11:27:55 UTC ---
(In reply to comment #8)
> I am a little bit confused by the answer:

My understanding is: It's a middle-end bug, which got exposed by Rev. 169083,
but which can occur also with other C, C++ or Fortran code.

A proper fix will presumably 4.7 only as it should be rather invasive; cf.
Michael's patch at http://gcc.gnu.org/ml/gcc-patches/2011-05/msg02029.html
which also should fix PR 39604?

For 4.6 one probably needs a different, less invasive patch.