HP-UX Floating-Point Guide

24 Chapter 1

Introduction

Overview of HP-UX Math Libraries

Basic operations such as addition and multiplication are speciﬁed by the

IEEE standard. More complex mathematical operations such as

logarithmic and trigonometric functions are provided by math library

routines. The high-level operations of math library routines are speciﬁed

not by the IEEE standard but by individual language standards (such as

ISO/ANSI C) and by programming environment speciﬁcations (such as

X/Open and SVID).

C math library functions are located in the libm math library. The libm

functions operate according to the C standard and the latest versions of

the System V Interface Deﬁnition (currently SVID3) and of the X/Open

Portability Guide (currently XPG4.2). The XPG4.2 speciﬁcation is a

superset of the POSIX.1 standard (IEEE Std 1003.1-1990). The SVID3

and XPG4.2 speciﬁcations are compatible. The libm library also

supports many functions and macros that the ISO/ANSI C committee

has included in the C9X draft standard (the proposed new ISO/ANSI C

standard).

Fortran and Pascal intrinsic functions are located in the libcl library.

In addition, Basic Linear Algebra Subroutine (BLAS) library routines

are provided in the libblas library (provided with the HP Fortran 90

and HP FORTRAN/9000 products only).

Table 1-1 lists the math libraries available on HP-UX systems and shows

the option you specify to the compiler or linker in order to link in each

library.