The KAP preprocessor determines whether the host architecture
is ev4 or ev5 and then optimizes your
program for that architecture by default. In the event you compile
a program on one architecture but plan to run it on another,
override the default by setting -tune equal to the
architecture where the program will run. For example, if you compile
a program on ev4 architecture, but plan to run it on
ev5 , use -tune=ev5 .
The KAP -tune switch and the Digital Fortran compiler
-tune host switch work independently and perform
different optimizations. The KAP -tune switch setting
has no effect on the Digital Fortran default -tune host
switch.