Hello!It is worth noticing that latest changes to gcc brought more than 75% speed-up on Polyhedron aermod.f90 benchmark [1]. I can confirm this on 32bit nocona, and double-checked on 64bit core2:
gcc -O3 -funroll-loops -ftree-vectorize -ffast-math: (GCC) 4.3.0 20070622 : 0m33.530s (GCC) 4.3.0 20070702 : 0m11.805s[1]: http://www.suse.de/~gcctest/c++bench/polyhedron/polyhedron-summary.txt-2-0.html
Uros.