Me too!! Did you say you were ordering one of these?
Bill. 2009/3/5 Jason Martin <jason.worth.mar...@gmail.com>: > >> I've got a 4.4c/l , Agner Fog's says the thruput on 64 bit mul is 4c/l , but >> in another section it says you can issue one every cycle , if the latter >> section means 32bit then , 4c/l could be right ( I say could not would as >> consider the K8) , I expect I can do a bit better than 4.4c/l , but who >> knows.A lot of the speed comes from reducing the overhead in mul_basecase. >> >> It quite a wide cpu , I would expect the combined functions(like addlsh1) to >> make a real difference on it. > > I've measure it directly to be 4 cycles per mul for sustained 64-bit > multiplies on core2, which agrees with Agner Fog. Even though there > are 3 ALU issue ports on the core2, only one of them can issue the > 64-bit mul. > > By the way, I ended up sitting next to an Intel hardware engineer on a > recent trans-atlantic flight. He assured me that the Core i7 can > perform sustained 64-bit multiplies at 1 cycle each. Of course, I'll > need to try this myself to believe it, but I'm pretty excited to get > my hands on the hardware. > > --jason > - Show quoted text - > > > --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
