On Apr 29, 10:33 am, Francois <[EMAIL PROTECTED]> wrote: <SNIP>
Hi Francois, > > Once you get some answer from upstream please open a ticket. I find it > > odd that the defaults are this way to say the least. > > I did email the author about the precision here is what he has to say: > > For ieee-add, it all depends on what kind of error bound you need. > If enabled, the error satisfies > > |e| <= |a+b| * epsilon > > It not enabled, the error satisfies > > |e| <= epsilon * max (|a|, |b|) > > For most uses the second one is just fine, but some times one needs > the > first one. > > Sloppy-mul and sloppy div usually degrades by few bits, so maybe you > lose a digit of accuracy. For double-double, the degredation is > smaller. Ok. Thanks for finding out. > ================ > The answer is not qualified by processors. He didn't say anything > about performance (I asked). Ok. Is there anybody out there who can run some quick test with a decent runtime using quaddouble only in a tight loop, preferably in pure C? We can pay in credit ;) Cheers, Michael --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
