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File No. 8360-29
Form C28-6590-0 OS




Systems Reference Library




IBM System/360 Operating System
PL/I Subroutine Library
Computational Subroutines

Program Number 3S0S-:LM-512

This publication gives details of the
computational subroutines available in the
PL/I Library. These subroutines are used
by the PL/I (F) compiler in the implementa-
tion of PL/I built-in functions and of the
operators used in the evaluation of PL/I
expressions. Not all PL/I built-in func-
tions and expression operators are support-
ed by the PL/I Library; the compiler gener-
ates in-line code for a small number of
them. The details provided include timing
figures, surrmaries of the mathematical
methods used, and (where appropriate) fig-
ures for range and accuracy. This informa-
tion is intended to be of interest chiefly
to those programmers concerned with the
performance of computational subprograms.
PREFACE




This publication provides the PL/I pro- IBM Systeml360 Principles of Operation,
grammer with detailed information about the Form A22-6821
computational subroutines which are part of
the OS/360 PL/I Library.
IBM Svstem/360 Operating System PL/I:
The reader is assumed to be a programmer Language Specifications, Form C28-6571
with a particular concern for performance
information associated with individual
modules. The numerical analyst is provided IBM System/360 Operating System: PL/I (F)
with a description of the algorithms, and a Programmer's Guide, li'orm C28-6594
specification of accuracy and range, where
these are considered to be significant.
IBM Systeml360 Operating System: Assem-
Useful background reading is provided in nler Language, Form C28-6514
the following IBM publications:




Copies of this and other IBM publications can be obtained through IBM
Branch Offices.
A form for reader's comments appears at the back of this publication.
It may be mailed directly to IBM. Address any additional comments
concerning this publication to the IBM Corporation, Department 039,1271
Avenue of the Americas, New York, N.Y. 10020.