Native f90 Compilers from DEC and IBM
Tor Bothner DEC, Tony Cass CN/DCI, and Michael Metcalf CN/ASD
Over the last few years we have been able to make a Fortran 90 compiler available on almost all computers on the CERN site by installing the f90 compiler provided by NAG. However, this compiler performs very little optimization and takes little advantage of the hardware features of the machine on which it is running --- it was only ever intended to be a portable compiler. On the other hand, it has been very useful for gaining experience with the new standard and for making initial evaluations of the impact of its new features.
In the long term, Fortran 90 can be useful only when fully-optimizing compilers become available, and the first ones of this type, from DEC and IBM, have now been installed at CERN. Details follow; note particularly that existing libraries can be used directly from new code in both cases.