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[Bug target/47989] -mrecip causes 482.sphinx3, 464.h264ref and 481.wrf to miscompare
- 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, 10 Mar 2011 14:01:27 +0000
- Subject: [Bug target/47989] -mrecip causes 482.sphinx3, 464.h264ref and 481.wrf to miscompare
- Auto-submitted: auto-generated
- References: <bug-47989-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47989
--- Comment #3 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2011-03-10 14:01:25 UTC ---
A similar problem occurs with the polyhedron test aermod.f90 (see pr34702).
> Feeding rcps sequences into call stmts is probably never a very good idea.
Probably the same thing for tests.
> In all cases the Intel compiler simply only uses rcp instructions for
> vectorized loops.
I think this would be a good idea, however the last time I have looked at it
(some time ago!-), gcc was not as good as intel to vectorize rcp.