HP-UX Floating-Point Guide

Summary of Technical

Changes

This edition of the HP-UX Floating-Point Guide describes the following

changes to the HP-UX math libraries at Release 11.00.

The math libraries provided in the /usr/lib directory support PA-RISC

1.1 (PA1.1) and PA-RISC 2.0 (PA2.0) systems. The libraries in /usr/lib

support PA2.0 systems in 32-bit mode; the libraries in

/usr/lib/pa20_64 support PA2.0 systems in 64-bit mode.

A version of the BLAS library tuned for optimal 32-bit performance on

PA2.0 systems is provided in the directory

/opt/fortran90/lib/pa2.0/libblas.a (for HP Fortran 90). The

PA1.1 version is in /opt/fortran90/lib/libblas.a.

At Release 11.00, the C math library implements several new functions

and macros that the ISO/ANSI C committee has included in the C9X

draft standard (the proposed new ISO/ANSI C standard):

• Exponential functions: exp2, scalbn

• Maximum, minimum, and positive difference functions: fdim, fmax,

fmin

• Comparison macros: isgreater, isgreaterequal, isless,

islessequal, islessgreater, isunordered

• Nearest integer functions: round, trunc, lrint, llrint, lround,

llround, nearbyint

• Manipulation functions: nan, nextafterf

• Remainder function: remquo

The following C library functions have been unsupported since Release

10.30:

• cabs (hypot has equivalent functionality)

• drem (remainder has equivalent functionality)

• finite (replaced by the isfinite macro)

• The fpgetround(3M) suite of functions (replaced by the fenv(5) suite)

• matherr

Documentation

The IEEE Standard for Binary Floating-Point Arithmetic (ANSI/IEEE

Std 754-1985) is the essential reference for developers of ﬂoating-point

applications. To obtain a copy, write to the IEEE Standards Board, 345

East 47th Street, New York, NY 10017, USA.