🚀 go-pugleaf

In article <MCCALPIN.91Jun16095840@pereland.cms.udel.edu> mccalpin@perelandra.cms.udel.edu (John D. McCalpin) writes:
 > >>>>> On 15 Jun 91 22:23:08 GMT, dik@cwi.nl (Dik T. Winter) said:
 > 
 > Dik> In article <9106150258.AA16308@ucbvax.Berkeley.EDU>
 > Dik> jbs@WATSON.IBM.COM writes:
 > 
 > JBS> [....]  3.  Do you know of any machine where the above code will
 > JBS> average 3x (or less) the time of a single multiply?
 > 
 > Dik> So this is irrelevant.
 > 
 > Winter is claiming that Shearer is trying to obfuscate the issues
 > about the performance of interval arithmetic (in terms of timing, not
 > the usefulness of the results.  
 > 
 > I see Shearer asking a very simple question: Please provide *specific*
 > information on machines where Winter's algorithms for interval add and
 > interval multiply perform less than 3 times slower than the equivalent
 > simple operation with a single rounding mode.
 > 
 > Then I suppose that the next step is to compare the performance of
 > interval arithmetic with 128-bit arithmetic on a machine like the
 > RS/6000.  To do this, we will first need to find someone who knows how
 > expensive the rounding mode change is in the RS/6000 FPU pipe, and
 > then someone who knows the timings of quad-precision arithmetic on the
 > RS/6000.  (I will be able to learn the latter as soon as I get xlf
 > version 2 installed on my machine).
 > --
 > John D. McCalpin			mccalpin@perelandra.cms.udel.edu
 > Assistant Professor			mccalpin@brahms.udel.edu
 > College of Marine Studies, U. Del.	J.MCCALPIN/OMNET


--
dik t. winter, cwi, amsterdam, nederland
dik@cwi.nl