Hello! > I did a quick comparison on an Intel Core2 Duo T7300 @2.00GHz using > (-m64) using: > > gfortran -march=native -ffast-math -funroll-loops -ftree-vectorize > -ftree-loop-linear -O3 > Could you perhaps add -fvect-cost-model to gcc-4.3 compile flags? There are some surprises there ;) Uros.