On Wed, Feb 18, 2009 at 8:05 PM, <ja...@njkfrudils.plus.com> wrote: > > On Thursday 19 February 2009 00:49:16 Jason Martin wrote: >> On Wed, Feb 18, 2009 at 7:13 PM, <ja...@njkfrudils.plus.com> wrote: >> > On Wednesday 18 February 2009 22:03:43 Mariah wrote: >> >> gmp-4.2.4 mpir-0.9.0 >> >> >> >> 2241.9 2251 cicero (pentium4-pc-linux-gnu) >> >> 3371.5 3369.3 cleo (ia64-unknown-linux-gnu) >> >> 6024.5 7437.8 eno (core2-unknown-linux-gnu) >> >> 6022.2 7387.1 fulvia (core2-pc-solaris2.10) >> >> 3367.8 3369.5 iras (ia64-unknown-linux-gnu) >> >> 1341.3 1343.6 mark (ultrasparc3-sun-solaris2.10) >> >> 6100 7421.1 menas (core2-unknown-linux-gnu) >> >> >> >> Mariah >> > >> > K10 crushes core-2 (intel fanbois hide their heads in shame :) >> > >> > gmp-4.2.4 mpir-0.9.0 r1614-k8-branch >> > 6014 7379 10118 box1 >> > (k8-unknown-linux-gnu) 1.8Ghz 9301 11659 15514 >> > cuda1 (k10-unknown-linux-gnu) 2.6Ghz >> >> I don't think that the core2 can get much faster... the addmul (and >> friends) are running just shy of 4 cycles/limb which is the max >> throughput rate for the 64-bit multiply instruction on core2. I'm >> appropriately hiding in shame :-) >> > > A lot of the speed comes from reducing the overhead in mul_basecase. The first > mul_basecase I did that used a 2.5c/l addmul loop gave a score of 8200 . > > How does a 20x20 mul_basecase compair with a 400 limb addmul_1 ? > > for K8 we have > 1110 cycles for 20x20 > 1031 cycles for 400 limb addmul > a 7.6% overhead for basecase over addmul
That code can probably be dropped straight into the core2 code, can't it? I haven't looked at your mul_basecase carefully, but as long as you aren't using the "inc" or "dec" functions too much, then it should support core 2 as well as K10. --jason --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "mpir-devel" group. To post to this group, send email to mpir-devel@googlegroups.com To unsubscribe from this group, send email to mpir-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/mpir-devel?hl=en -~----------~----~----~----~------~----~------~--~---
