------- Comment #2 from rguenth at gcc dot gnu dot org 2007-10-01 09:46 -------
With a more recent 4.3 version I get
4.2 4.3
-O2 6.1s 5.1s
-O3 4.1s 5.1s
both -O3 variants have one function not inlined in the main loop. For 4.2
it is
EiEval<EiMatrixProduct<EiMatrix<double, 3, 3>, EiMatrix<double, 3, 3> > >
operator*<double, EiMatrix<double, 3, 3>, EiMatrix<double, 3, 3>
>(EiObject<double, EiMatrix<double, 3, 3> > const&, EiObject<double,
EiMatrix<double, 3, 3> > const&)
for 4.3 it is
EiMatrix<double, 3, 3>& EiObject<double, EiMatrix<double, 3, 3>
>::operator=<EiSum<EiMatrix<double, 3, 3>,
EiScalarProduct<EiSum<EiMatrix<double, 3, 3>, EiMatrix<double, 3, 3> > > >
>(EiObject<double, EiSum<EiMatrix<double, 3, 3>,
EiScalarProduct<EiSum<EiMatrix<double, 3, 3>, EiMatrix<double, 3, 3> > > > >
const&)
but even complete inlining does not improve numbers much. There's also
nothing obvious in the asm - we simply have too little registers and load/store
from/to memory very often.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33604
