Article View: comp.sys.atari.st
Article #27367Re: More ST Floating Point Performance - (nf)
From: Steven Pemberton
Date: Thu, 25 Jun 1987 13:51
Date: Thu, 25 Jun 1987 13:51
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1484 bytes
In article <19400004@qtecmuc.UUCP> ger@qtecmuc.UUCP writes: > According to Kernighan&Ritchie (Appendix A, 6.2 on page 184 in my copy) > 'all floating point arithmetic in C is carried out in double precision'. > Therefore, if manx on the AMIGA really uses one longword for floating point > evaluations it simply isn't real C, and benchmarks with this compiler > are pure nonsense if compared with 'correct' C-Compilers using 64 bit > double precision. You have misunderstood. One page earlier it says "[float] and [double] may be synonymous in some implementations.": when they say that floating point is carried out in double precision, they mean 'in the accuracy used for double precision'. Actually, I know of at least one implementation that evaluates expressions in greater than double precision. Obviously not a correct C compiler :-). Steven Pemberton, CWI, Amsterdam; steven@cwi.nl (steven@mcvax.uucp old style).
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!mnetor!seismo!mcvax!steven From: steven@cwi.nl (Steven Pemberton) Newsgroups: comp.sys.atari.st Subject: Re: More ST Floating Point Performance - (nf) Message-ID: <7434@boring.cwi.nl> Date: Thu, 25-Jun-87 09:51:59 EDT Article-I.D.: boring.7434 Posted: Thu Jun 25 09:51:59 1987 Date-Received: Sat, 27-Jun-87 06:53:31 EDT References: <1959@trwrb.UUCP> <19400004@qtecmuc.UUCP> Reply-To: steven@boring.UUCP (Steven Pemberton) Organization: CWI, Amsterdam Lines: 17