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[Bug tree-optimization/43427] The loop is not interchanged and thus could not be vectorized.
- From: "spop at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 18 Mar 2010 18:59:13 -0000
- Subject: [Bug tree-optimization/43427] The loop is not interchanged and thus could not be vectorized.
- References: <bug-43427-18740@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #2 from spop at gcc dot gnu dot org 2010-03-18 18:59 -------
In the output of ./cc1 -O3 -floop-interchange -fdump-tree-graphite-all
-ftree-vectorizer-verbose=7
we have: "Loops at depths 0 and 1 will be interchanged."
so we do the interchange, but then the vectorizer complains about:
"note: not vectorized: data ref analysis failed D.2729_41 = a[i_40][var.8_47];"
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43427