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[Bug tree-optimization/31079] 20% difference between ifort/gfortran, missed vectorization
- From: "rguenth 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 Aug 2008 15:20:20 -0000
- Subject: [Bug tree-optimization/31079] 20% difference between ifort/gfortran, missed vectorization
- References: <bug-31079-6642@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #6 from rguenth at gcc dot gnu dot org 2008-08-18 15:20 -------
The problem for the GCC vectorizer is that there are no loads or stores left
in the loop and it doesn't handle vectorizing "registers" only. This is a
case where real vectorization of straight-line code would be necessary.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31079