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

Glossary
porting
Glossary 261
invalid operation The floating-point exception
that occurs whenever the system attempts to
perform an operation that has no numerically
meaningful interpretation, such as a NaN.
L-N
language extension A feature of a programming
language that has been added by a vendor and is not
defined in (or is in violation of) the language
standard. The ON statement is an HP language
extension to the Fortran 90 Standard. See also
filename extension..
libU77 routines Routines in the BSD 3f library
(libU77.a) that provide a Fortran 90 interface to
selected system calls in libc.a. The libU77.a
library is part of HP Fortran 90 and is accessed with
the +U77 option.
migrating In this document, migrating refers to the
processing of moving a program written for
HP FORTRAN 77 to HP Fortran 90. See also
porting..
memory fault See segmentation violation.
millicode routines Millicode versions of frequently
called intrinsics, having very low call overhead and
little error-handling. One of the optimizations
performed by HP Fortran 90 is to replace calls to
eligible intrinsics with millicode versions.
.mod file A file that is created and read by the
compiler when processing Fortran 90 source files
that define or use modules.
module A type of Fortran 90 program unit that is
used for sharing data. Modules can also be used to
contain subprograms.
NaN Not-a-Number, the condition that results from
a floating-point operation that has no mathematical
meaning, such as infinity divided by infinity. The
ON statement can be used to trap operations that
result in NaN.
null The null character ('\0') that is used in C
programs to terminate strings.
O-Q
one-trip DO loop A DO loop that, if reached,
executes for at least one iteration. Programs written
for some implementations of FORTRAN 66 rely on
one-trip DO loops.
optimization Code transformations made by the
compiler to improve program performance.
overflow An exception condition that occurs when
the result of a floating-point operation is greater
than the largest normalized number. See also
integer overflow..
parallel execution Program execution on multiple
processors at the same time. One of the
optimizations performed by the compiler is to
transform eligible program loops for parallel
execution.
parallelization An optimization that transforms
eligible program loops for parallel execution on a
multiprocessor machine.
PIC See position-independent code.
porting In this document, porting refers to the
process of moving a program that was coded for
another vendor’s Fortran to HP Fortran 90. See
also See also migrating..