HP UX Fortran Software manual Also filename extension

language	A feature of a programming language that has been added by a vendor
extension	and is not defined in (or is in violation of) the language standard. The
	ONstatement 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.alibrary is part
	of HP Fortran 90 and is accessed with the +U77option.
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
	ONstatement 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 DOloop that, if reached, executes for at least one iteration. Programs
	written for some implementations of FORTRAN 66 rely on one-trip DOloops.
optimization	Code transformations made by the compiler to improve program
	performance.
overflow an	condition that occurs when the result of a floating-point operation is greater
exception	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..

position-independent code

Object code that contains no absolute addresses. Position-independent code (PIC) has linkage tables that contain pointers to code and data. This table is filled in by the loader at runtime. Object code that consists of PIC can be used to create shared libraries.

precision	The number of digits to which floating-point numbers are represented.
	Double-precision numbers can have greater precision than single-precision
	numbers.

156 Glossary