HP 3000 Manuals

HP FORTRAN 77/iX Migration Guide

Using the Same Source Code 

If you wish to compile the same source code using both the HP FORTRAN
77/V and HP FORTRAN 77/iX compilers, you can use the IF directive to
specify conditional compilation.  This will switch the declarations of
items that significantly affect performance.

Example 

     $SET (MPE_IX = .TRUE., MPE_V = .FALSE.)
     $IF (MPE_IX)
           INTEGER*4 i,j,k
           LOGICAL*4 tested
     $ENDIF
     $IF (MPE_V)
     $SHORT
           INTEGER*2 i,j,k
           LOGICAL*2 tested
     $ENDIF

SEGMENT directives can be left in the source code as synonyms for the
LOCALITY directive of HP FORTRAN 77/iX. See "LOCALITY Directive" in
Chapter 8 for further information.

MPE/iX 5.0 Documentation