HP-UX Floating-Point Guide

112 Chapter 4

HP-UX Math Libraries on HP 9000 Systems

Contents of the HP-UX Math Libraries

This section describes in some detail the contents of the math libraries.

These libraries include:

• Scalar math libraries (libm and libcl)

• The BLAS library libblas (provided with the HP Fortran 90 and HP

FORTRAN/9000 products only)

• The vector library libvec (provided with the HP FORTRAN/9000

product only) (obsolete)

Scalar Math Libraries (libm and libcl)

There are two sets of scalar math libraries, a 32-bit library implemented

using the PA1.1 instruction set and a 64-bit library implemented using

the PA2.0 instruction set. In both sets of libraries, the most important

functions are carefully optimized. See Table 1-3 on page 29 for the path

names of these libraries.

For even faster performance, a number of frequently used math

functions are implemented in the millicode library as well as in the

standard math library. See “Millicode Versions of Math Library

Functions” for details.

Millicode Versions of Math Library Functions

Several of the most frequently used math functions are implemented in

the millicode library as well as in the math library. The millicode

versions have a streamlined calling sequence and are usually faster than

their counterparts in the math library.

Like libm and libcl, the millicode library has both a 32-bit version and

a 64-bit version. The 32-bit version, /usr/lib/milli.a, contains PA1.1

functions, called when you compile with +DA1.1, and PA2.0 functions,

called when you compile with +DA2.0. The 64-bit version,

/usr/lib/pa20_64/milli.a, contains routines that are called when

you compile with +DA2.0W.

Millicode versions exist for the following Fortran and C functions. They

have double-precision versions only, unless otherwise speciﬁed.