Author: Tom Kerrigan
Date: 10:17:57 10/25/01
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On October 24, 2001 at 23:11:38, Robert Hyatt wrote: >Note that 64 bit processors don't necessarily have 64 bit address spaces. >The Cray family is one example with 64 bit values, but a 32 bit address >space. The MIPS guys have not yet implemented a full 64 bit address space >for obvious reasons... > >In fact, I don't know of any 64 bit processors that really have a full 64 >bit address space, due to the size of it and the unnecessary waste involved >in gating addresses that are impossible to generate. I don't remember what >the MIPS guys (for example) have done recently, but early chips had something >like a 43 bit address space or some such oddball number... Right, I think everybody just hacks off some high order bits to do addressing. It should be easy enough to connect wires to them if everybody suddenly needs more than 64 GB of RAM or whatever... -Tom
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