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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: 19 Jan 2008 12:03:23 -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 #9 from hubicka at gcc dot gnu dot org 2008-01-19 12:03 -------
Does the regression on C2 duo show even without vectorizing? It looks like
generic SSE fpmath performance issue. There should be no reason why SSE math
in combination with SSE vectorization should result in regression...
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31897