[Bug tree-optimization/32377] can't determine dependence (source/destination overlap without more than size)

spop at gcc dot gnu dot org gcc-bugzilla@gcc.gnu.org
Tue Jul 3 07:14:00 GMT 2007



------- Comment #6 from spop at gcc dot gnu dot org  2007-07-03 07:14 -------
(In reply to comment #5)
> I am not sure about that. I tried the following cases and got distance 1 (and
> direction positive) in all of them for load and store to ia pair.
> What am I missing?
> 
Distance vectors are lexicographically positive vectors, that is why you get
the 1
in all these cases.  If you want to know which one comes first, you have to
look
at the DR_IS_READ for both references in the dependence relation.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32377



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