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                     IBM System/370 RPQ



                     High Accuracy Arithmetic




Publication Number   File Number
SA22-7093-0          S370-01
This publication describes an IBM System/370 RPQ, high-accuracy
arithmetic. The facility performs the floating-point operations
of addition,  subtraction, multiplication, division, and scalar
product (the sum of products) with the maximum accuracy possible
within    the     floating-point-number   representation.     The
instructions of this facility are used, in conjunction with other
System/370 floating-point instructions, in either the System/370
mode or the ECPS:VSE mode, if the model provides the ~ode.
The reader should be familiar with the IBM ~~tem/370 Principles
of Operation, GA22-7000, or the IBN 4300 P,'ocessors Principles of
Ope r {l t ion for FCPS: VS E Mod e , GA22 - 7 0 7 0 , a 5 a p pro p i~ i atE, and
particularly with Chapter 9, "Floating-Point Instructions," of
either of those publicatiuns.
The facility discussed in this publication is not available on
all models.   At the time of publication, it is provided on the
IBM 4361 Processor. The information published her8in should not
be construed as implying any intent~on by IBM to provide the
facility on models other than tho~e for which it is announced.
For more information concerning the availability of this facility
on any particular modal, refer to the latest edition of the Func-
tional Characteristics manual for the model.




First Edition (January 1984)
Changes are made pariodically to the informati~n herein; before
using this p~blication in connection with the operation 6f IBM
equipment, ~efer to the latest IBM ~stem/370 and ~300 Processors
Bibliograph\!...t. GC20"OOOl, for the editions that are applicable and
current.
References in this publication to IBM products, programs, or
services do not imply that IBM i~tends to make thase available in
all countries in which IBM operates. Any reference to an IBM
program product in this publication is not intended to state or
imply that only IBM's program product may be used.      Any func-
tionally equivalent program may be used instead.
Publications are not stocked at       the address given below.
Requests for IBM pUblications should be made to your IBM repre-
sentative or to the IBM branch office serving your locality.
A form for readers' commants is provided at the back of this
publication.   If the form has been removed, comm~nts may be
addressed to IBM Corporation, Product Publications, Department
898, PO Box 390, Poughkeepsie, NY, U.S.A. 12602. IBM may use or
distribute whatever information you supply in any way it believes
appropriate without incurring any obligation to you.
 c Copyright International Business Machines Corporation 1984
                                                         CONTENTS




HIGH-ACCURACY-ARITHMETIC FACILITY     

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