http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43657

--- Comment #6 from Alexandre Oliva <aoliva at gcc dot gnu.org> 2011-01-16 
12:29:18 UTC ---
Created attachment 22982
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22982
Proposed patch

This avoids the transformation, but...  Is the test too strict?  My reasoning
is that, since we're in closed form (right?), the exit block will only have
PHIs for stuff that is changed wthin the loop and is used outside the loop. 
Does that sound sound? :-)

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