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[Bug tree-optimization/39300] vectorizer confused by predictive commoning and PRE
- From: "matz at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 22 Jul 2009 15:40:26 -0000
- Subject: [Bug tree-optimization/39300] vectorizer confused by predictive commoning and PRE
- References: <bug-39300-12182@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #8 from matz at gcc dot gnu dot org 2009-07-22 15:40 -------
So, the immediate problem is now fixed, but I'd suggest leaving this
enhancement request open, in case anybody wants to work on extending the
vectorizer to deal with these loop-carried dependencies, because in that
case we wouldn't need to dumb down PRE anymore, which would be even better.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39300