On Sat, Aug 14, 2010 at 12:08:21AM +0200, Tobias Burnus wrote: > > In terms of options, I think -funroll-loops should also be used as it > usually improves performance (it is not enabled by any -O... option). >
I wonder if gfortran should check if -O and -O2 is given, and then add -funroll-loops. In my tests, I've rarely seen a performance issue with -O and -O2. I have seen problems in the past with -O3 and -funroll-loops. -- Steve
