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- From: Dominic Dunlop <uunet!mcvax!sphinx.co.uk!domo>
- Cc: bryson <bryson@tahoe.unr.edu>
-
- In article <208@longway.TIC.COM> Derry Bryson writes:
- >I am searching for a standard to check floating point processors and
- >emulators against. Basically what I would like to find is a program
- >that performs several operations and evaluates the accuracy of the answers
- >based upon some kind of accepted standard.
- >...
- >Volume-Number: Volume 14, Number 28
-
- ;login:, Volume 11, Number 2, March/April, 1986, pp 31-56
-
- A Report on the Accuracy of Some Floating Point Math Functions on Selected
- Computers
-
- Technical Report GIT-ICS 85/06
-
- Eugene H Spafford
- John C Flaspohler
-
- School of Information and Computer Science
- Georgia Institute of Technology
- Atlanta, Georgia 30332-0280
- (404) 894-3152
-
- Software Engineering Research center
- Georgia Institute of Technology
- Atlanta, Georgia 30332-0280
- (404) 894-3180
-
- Abstract
- The UNIX operating system and the C programming language have gained a
- large folloing in recent years, especially in research and academic
- settings. C and UNIX-like environments are available on a wide variety of
- machines from personal computer to mainframe computers; however, few, if
- any, of these implementations provide accurate floating point libraries,
- although users tend to believe they do. This paper presents the results of
- running a set of accuracy test on more than a dozen different computer
- systems under various versions of UNIX and UNIX-like environments.
-
- Funding for the original printing of this report was obtained from the
- School of Information and Computer Science, and from the Software
- Engineering Research Center.
-
- Copies of this report may be requested by sending US mail to the authors at
- the address given on the title page or from
- {akgua,decvax,hplabs,ihnp4,seismo}!gatech!tech-reports
-
- Well, the path's a history lesson,
-
- [ Spafford is now at Purdue, and can be reached as spaf@cs.purdue.edu;
- as Dominic alludes, ihnp4 and seismo are effectively dead, but gatech is
- still quite active, and can be reached from most of the known world. -mod ]
-
- but the paper's well worth getting hold of. It pulls no punches in
- showing some magnificently awful results. No re-usable test suite is
- mentioned -- although I dare say Georgia Institute of Technology may
- still have one. The tests used were carefully coded from ``random
- accuracy tests for various standard mathematical functions'' given in
- _Software Manual for Elementary Functions_, William J Cody Jr. &
- William Waite, Computational Mathematics, Prentice-Hall, 1980.
-
- It came as a surprise to me that the 3B2 had the most accurate math
- package at the time. It was also as slow as hell, but that's been fixed
- now. Wonder how accurate the new math package is...
- --
- Dominic Dunlop
- domo@sphinx.co.uk domo@riddle.uucp
-
- Volume-Number: Volume 14, Number 33
-
-