Author: Robert Hyatt
Date: 20:12:24 06/17/00
Go up one level in this thread
On June 16, 2000 at 23:38:10, Bruce Moreland wrote: >If you are talking about the alpha, it does 32-bits with no performance penalty, >right? So the fact that an int is 32-bits on the Windows Alpha compiler >shouldn't be a big deal. And they do provide good access to the 64-bit data >type. > >Not that Alpha is anything these days. > >bruce > More recent alphas are brutes. Tim Mann ran a 21264 at somewhere around 650mhz, and Crafty was hitting almost 1M nodes on a one CPU box. That is so far beyond what any other single cpu machine can do it doesn't count. There are 264's running well beyond 650mhz today... And there are some with a pot full of cpus too. :) But they are way pricey... and most are NUMA. >On June 15, 2000 at 19:10:32, Eugene Nalimov wrote: > >>That's not true for some systems. Int is still 32 bits, but "natural" word size >>is 64 bits. >> >>Eugene >> >>On June 15, 2000 at 17:28:26, Tom Kerrigan wrote: >> >>>On June 15, 2000 at 06:15:55, Christophe Theron wrote: >>> >>>>On June 14, 2000 at 17:29:07, Dave Gomboc wrote: >>>> >>>>>On June 14, 2000 at 16:17:25, Christophe Theron wrote: >>>>> >>>>>>The availability of 64 bits processors changes nothing. Unless some 64 bits >>>>>>processors are so lousy that 8, 16 and 32 bits operations become slower than 64 >>>>>>bits ops...! :) >>>>> >>>>>I don't think it is unusual for certain operations on sizes smaller than the >>>>>processor word size to take longer than they would if they used the processor's >>>>>word size. Indeed, it wouldn't even be unusual for it to be possible without >>>>>first sign-extending or zero-extending from the smaller size to the processor >>>>>word size. AFAIK, 80x86 is a bit freaky in that it tries very hard to support >>>>>8-bit and 16-bit operations in registers as quickly as 32-bit operations. >>>>> >>>>>Dave >>>> >>>> >>>>That would be a very unfair way for bitboards to win the contest! :) >>>> >>>> >>>> Christophe >>> >>>Just define everything in your program as an int. It will automatically use the >>>processor's word size, so problem solved. :) >>>-Tom
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