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[Bug middle-end/40979] induct benchmark 60% slower when compiled with -fgraphite-identity
- 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: Wed, 26 Jan 2011 10:23:30 +0000
- Subject: [Bug middle-end/40979] induct benchmark 60% slower when compiled with -fgraphite-identity
- Auto-submitted: auto-generated
- References: <bug-40979-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40979
--- Comment #9 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2011-01-26 10:23:12 UTC ---
This pr is not fixed at revision 169261 (gfc). AFAIU -ftree-loop-linear is now
implemented through graphite. This leads to a sort of regression with respect
to revision 169227(gfc6):
[macbook] lin/test% gfc -Ofast -ftree-loop-linear induct.f90
[macbook] lin/test% time a.out > /dev/null
22.380u 0.023s 0:22.40 100.0% 0+0k 0+0io 0pf+0w
[macbook] lin/test% gfc6 -Ofast -ftree-loop-linear induct.f90
[macbook] lin/test% time a.out > /dev/null
13.978u 0.019s 0:13.99 99.9% 0+0k 0+0io 0pf+0w