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[Bug target/31897] [4.3 Regression] 30% speed regression with -m32 on Opteron with rnflow
- From: "hubicka at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 30 Jan 2008 16:04:30 -0000
- Subject: [Bug target/31897] [4.3 Regression] 30% speed regression with -m32 on Opteron with rnflow
- References: <bug-31897-13404@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #11 from hubicka at gcc dot gnu dot org 2008-01-30 16:04 -------
If you have nothing against, I would probably go for -mfpmath=sse implied by
-ftree-vectorize route then.
Since there is now i386 ABI mailing list I hope if we can move in direction of
having -mfpmath=sse by default on CPUs where it is win and when available. It
will however take few years until we can ignore non-SSE2 CPUs reasonably :(
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31897