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[Bug tree-optimization/52275] The polyhedron test air.f90 is miscompiled with '-O2 -floop-flatten' after revision 184265
- 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: Thu, 16 Feb 2012 13:46:30 +0000
- Subject: [Bug tree-optimization/52275] The polyhedron test air.f90 is miscompiled with '-O2 -floop-flatten' after revision 184265
- Auto-submitted: auto-generated
- References: <bug-52275-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52275
--- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2012-02-16 13:46:30 UTC ---
> If I apply the pseudo-patch at the end, air still works fine at -O3 or -O2 on
> x86_64-linux. So, what exactly is miscompiled with that patch applied? -O2
> -fgraphite-identity? Something else?
Please read the beginning of the post:
> Revision 184265 fixes the ICE I saw on the 2005 polyhedron test air.f90.
> However as reported in comment #9 of pr50561, the test is miscompiled with '-O2
> -floop-flatten' and higher optimization:
Can it be clearer?