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[Bug tree-optimization/53346] [4.6/4.7/4.8 Regression] Bad vectorization in the proc cptrf2 of rnflow.f90
- From: "dominiq at lps dot ens.fr" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 18 May 2012 14:49:22 +0000
- Subject: [Bug tree-optimization/53346] [4.6/4.7/4.8 Regression] Bad vectorization in the proc cptrf2 of rnflow.f90
- Auto-submitted: auto-generated
- References: <bug-53346-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53346
--- Comment #9 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2012-05-18 14:49:22 UTC ---
> Unfortunately, the loop in original rnflow test still gets vectorized, with no
> change in the runtime:
Confirmed, at revision 187655 I still get
-O2 21.8
-O2 -ftree-vectorize 27.9
-O3 25.2
-O3 -fno-tree-vectorize 21.4
Uneducated guess: is it possible that failed attempts to vectorize may mess up
further optimizations?