I believe it will. However, the performance issues that Core2/Penryn have do not exist on Nehalem/Sandy Bridge. It's surprising to me now that those platforms were so bad compared to AMD. These days it seems to be the other way around.
Anyway, I'm pretty sure my code gets better the lower the mul latency/throughput and the higher the memory bandwidth. So things should be great on later Intel machines. But I'll have to check at some point. I hope to have access to a nehalem in a couple of days, and I will be buying a haswell in a few weeks time. Bill. On 23 February 2014 22:18, Brian Gladman <b...@gladman.plus.com> wrote: > On 23/02/2014 20:09, Bill Hart wrote: > > After a lot of work I have managed to remove the performance problem > > with the new division code on penryn. > > > > Two important facts about core2/penryn are that it is always better to > > save muls and always better to save memory read/writes where possible, > > since both take a long time on that architecture. > > > > So I now have a version of the code which performs well on Intel and > > AMD. Unfortunately the difference in the basecase range is much less > > pronounced on AMD, being only up to about 20% faster, with an average of > > more like 10%. However, the performance in the divide-and-conquer range > > has improved by 3-4% and we now beat GMP by 25% at certain points. > > > > I still need to tune a couple of crossovers, but the new division code > > shouldn't much in the way of changes now. > > Is this improvement likely to work on Nehalem/Sandy Bridge/Ivy Bridge? > > Brian > > -- > You received this message because you are subscribed to the Google Groups > "mpir-devel" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to mpir-devel+unsubscr...@googlegroups.com. > To post to this group, send email to mpir-devel@googlegroups.com. > Visit this group at http://groups.google.com/group/mpir-devel. > For more options, visit https://groups.google.com/groups/opt_out. > -- You received this message because you are subscribed to the Google Groups "mpir-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to mpir-devel+unsubscr...@googlegroups.com. To post to this group, send email to mpir-devel@googlegroups.com. Visit this group at http://groups.google.com/group/mpir-devel. For more options, visit https://groups.google.com/groups/opt_out.
