HP Fortran Programmer's Guide (B3908-90031; September 2011)

Performance and optimization
Controlling code generation for performance
Chapter 6172
Controlling code generation for performance
For optimum performance, the executable program should consist of code that can take advantage of the
hardware features of the machine on which the program will run. If your program will run on the same
machine as you use to compile it, code generation is not an issue. By default, the HP Fortran compiler
generates code for the model of the machine on which you are running the compiler.
However, if you are compiling on a different machine from the one on which the program will run, you
should use the +DAmodel option to ensure that the compiler generates code based on the target architecture.
For information about using this option, see “Compiling for different PA-RISC machines” on page 87.