Author: Robert Hyatt
Date: 20:13:13 10/24/01
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On October 24, 2001 at 17:16:06, Tom Kerrigan wrote: >On October 24, 2001 at 15:23:35, Robert Hyatt wrote: > >>"numbers" simply don't require such large representations, which wastes a lot >>of bus bandwidth transferring 128 bit values when the majority are 16 bits or >>less... > >The only bus bandwidth that's really wasted is in the datapath, which doesn't >really matter. Just because the datapath is 128 bits doesn't mean all memory >transactions have to be. > >-Tom Sure it does. In fact, the memory datapath is _always_ a multiple of the wordsize, otherwise super-scalar won't work at all. IE Intel uses 64 bit data paths. Alphas use 256. Cray does it totally different but they gate pairs of words (128 bits) to/from memory...
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