Author: Robert Hyatt
Date: 17:36:45 10/24/03
Go up one level in this thread
On October 24, 2003 at 13:59:07, Vincent Diepeveen wrote: >On October 24, 2003 at 13:38:13, Robert Hyatt wrote: > >>On October 23, 2003 at 22:29:39, Vincent Diepeveen wrote: >> >>>On October 22, 2003 at 11:28:09, Gerd Isenberg wrote: >>> >>>>On October 22, 2003 at 03:33:05, Daniel Clausen wrote: >>>> >>>>>On October 21, 2003 at 15:29:19, Eugene Nalimov wrote: >>>>> >>>>>>On Itanium integer registers are actually 65 bits wide. 64 bits for data and one >>>>>>NAT (not a thing) bit. >>>>>> >>>>>>:-) >>>>>> >>>>>>Thanks, >>>>>>Eugene >>>>> >>>>>If there is a way to use this bit for yourself too, I'm sure Gerd will come up >>>>>with another cool new algorithm! :) >>>>> >>>>>Sargon >>>> >>>>;-) >>>> >>>>I'm really not familar with this very interesting processor architecture. It has >>>>an integer register file of 128! * 64+NaT. It seems well designed to do a lot of >>>>parallel fill cycles. >>>>I guess a set NaT-bit may trigger some exceptions/interrupts if you do some >>>>operations with uninitialited registers, allowing some lowlevel try-catch like >>>>control structures (including stack rewind?). >>>> >>>>Gerd >>> >>>Itanium2 is especially known for executing many NOP instructions :) >>> >>>Nah it isn't that bad. It's a cool cpu in fact. Too bad it can't be clocked very >>>high. >>> >>>It's horror & co for bitboards though. Forget writing in assembly for that >>>processor :) >> >>Why do you make such uninformed statements? It is _not_ "horror and co for >>bitboards". It works _great_ for bitboards. >> >>And _you_ might forget writing in asm, but I have written asm for VLIW >>architectures in the past. It is not that difficult. But then again, >>I am very flexible. Rigidity always has problems bending into a new >>"shape". > >Diep, which is a 32 bits program and doesn't fit in 16KB instruction cache, >is profitting more from itanium2 than crafty does. > >Crafty as you might know is a 64 bits program which is fitting a whole lot >easier in that 16KB instruction cache than diep is. > >End of proof. Crafty comes _nowhere_ near fitting into a 16kb instruction cache. Crafty profits from the 64 bit stuff on Itanium, which is why the itanium is always faster when I have tested it.
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.