Article View: comp.sys.atari.st
Article #27308Re: More ST Floating Point Performance - (nf)
From: Ali Ozer
Date: Sun, 21 Jun 1987 21:02
Date: Sun, 21 Jun 1987 21:02
19 lines
1617 bytes
1617 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 nonsens if compared with 'correct' >C-Compilers using 64bit double precision. The use of single-word floating point operations is a feature, not a limitation. Manx gives you various FP modes, among which the IEEE double and the Motorola FFP. 68881 is also supported. You specify which mode you want through switches to the compiler and/or linking in the various libraries... Now if I have a program that did not need 10+ digits but could get away with the 7 or so digits Motorola FFP provides, I will certainly use the FFP mode, considering it is 7 to 8 times faster. Ali Ozer, ali@rocky.stanford.edu
Technical Details
Message-ID:
<371@rocky.STANFORD.EDU>Path:
arc1-ca.pugleaf.net!utzoo!mnetor!seismo!rutgers!ames!oliveb!pyramid!decwrl!labrea!rocky!aliReferences:
<1959@trwrb.UUCP> <19400004@qtecmuc.UUCP>Show Full Headers
Complete Article Headers
Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!mnetor!seismo!rutgers!ames!oliveb!pyramid!decwrl!labrea!rocky!ali From: ali@rocky.STANFORD.EDU (Ali Ozer) Newsgroups: comp.sys.atari.st Subject: Re: More ST Floating Point Performance - (nf) Message-ID: <371@rocky.STANFORD.EDU> Date: Sun, 21-Jun-87 17:02:19 EDT Article-I.D.: rocky.371 Posted: Sun Jun 21 17:02:19 1987 Date-Received: Tue, 23-Jun-87 01:32:16 EDT References: <1959@trwrb.UUCP> <19400004@qtecmuc.UUCP> Reply-To: ali@rocky.UUCP (Ali Ozer) Distribution: world Organization: Stanford University Computer Science Department Lines: 19