HP UX Fortran Software manual 5

Vectorization........................................................................................................................		103
Using the +Ovectorize option............................................................................................		103
Controlling vectorization locally.........................................................................................		104
Calling BLAS library routines.............................................................................................		105
Controlling code generation for performance...........................................................................		106
7 Writing HP-UX applications......................................................................		107
Accessing command-line arguments........................................................................................		107
Calling HP-UX system and library routines................................................................................		108
Using HP-UX file I/O.............................................................................................................		108
Stream I/O using FSTREAM..............................................................................................		108
Performing I/O using HP-UX system calls.............................................................................		108
Establishing a connection to a file......................................................................................		108
Obtaining an HP-UX file descriptor.....................................................................................		109
8 Calling C routines from HP Fortran............................................................		110
Data types...........................................................................................................................		110
Unsigned integers............................................................................................................		111
Logicals..........................................................................................................................		111
Complex numbers............................................................................................................		112
Derived types..................................................................................................................		113
Pointers...........................................................................................................................		113
Argument-passing conventions................................................................................................		113
Case sensitivity.....................................................................................................................		114
Arrays.................................................................................................................................		116
Memory layout of a two-dimensional array in Fortran and C..................................................		116
C strings..............................................................................................................................		118
C null-terminated string.....................................................................................................		118
Fortran hidden length argument.........................................................................................		118
Passing a string...............................................................................................................		118
File handling........................................................................................................................		120
Sharing data........................................................................................................................		122
9 Using Fortran directives...........................................................................		123
Directive syntax....................................................................................................................		123
Using HP Fortran directives....................................................................................................		123
$HP$ ALIAS....................................................................................................................		124
$HP$ CHECK_OVERFLOW...............................................................................................		126
$HP$ LIST.......................................................................................................................		127
$HP$ OPTIMIZE..............................................................................................................		127
Compatibility	directives.........................................................................................................	128
Controlling	vectorization...................................................................................................	128
Controlling parallelization.................................................................................................		129
Controlling dependence checks.........................................................................................		129
Controlling checks for side effects.......................................................................................		129
10 Migrating to HP Fortran.........................................................................		131
Incompatibilities with HP FORTRAN 77...................................................................................		131
Compiler limits................................................................................................................		131
Command-line options not supported..................................................................................		131
Format field widths...........................................................................................................		132
Floating-point constants.....................................................................................................		132
Intrinsic functions.............................................................................................................		132
Procedure calls and definitions..........................................................................................		133
Data types and constants..................................................................................................		133
Input/output....................................................................................................................		134
Directives........................................................................................................................		134

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