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[Bug middle-end/41193] [4.5 Regression] slow compilation with graphite
- From: "jv244 at cam dot ac dot uk" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 31 Aug 2009 10:50:12 -0000
- Subject: [Bug middle-end/41193] [4.5 Regression] slow compilation with graphite
- References: <bug-41193-6642@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #4 from jv244 at cam dot ac dot uk 2009-08-31 10:50 -------
(In reply to comment #3)
> On the 4.4 branch with -fgraphite?
yes, that is correct, i.e. with the 4.4 branch the
gfortran -fgraphite -c -O2 -ffast-math -funroll-loops -ftree-vectorize
-march=native -ftime-report tmp.f90
command (thus including -fgraphite) takes about 4s seconds, while the same
command line takes about 371s with 4.5.
as explained by Sebastian in PR40965, this might be due to the fact that
graphite recognizes now more loop constructs.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41193