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Hi Jack >               dragonegg degg+vectorize degg+optnz  gfortran > ac               12.45       12.45         8.85       8.80 > gas_dyn          11.72       11.80         4.47       4.26 > induct           24.02       24.91        12.08      13.65 > rnflow           32.25       32.35        26.47      24.06 Any idea what might cause such differences here? -- With best

Attached are the Polyhedron 2005 benchmark results for current llvm/dragonegg svn on x86_64-apple-darwin11 built against Xcode 4.3.2 and FSF gcc 4.6.3. The benchmarks for -msse3 and -msse4 appear identical (at least for degg+optnz). This is fortunate since there seems to be a bug in -msse4 on 2.33 GHz (T7600) Intel Core 2 Duo Merom (http://llvm.org/bugs/show_bug.cgi?id=12434).