Author: Robert Hyatt
Date: 18:48:21 07/24/02
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On July 24, 2002 at 11:34:00, Matthew Hull wrote: > >>...It is too expensive to do it that way in >>Crafty... One day, perhaps. IE one day we might have real vector instructions >>on a PC, like intel did on the i860 family... > >I'm curious. The PPC G4 has a vector processor. Would that meet the criteria >or are there other issues as well, like memory speed? It depends. IE on the Cray, the first vector operation (say an add or whatever) might take three clock cycles plus the memory latency time. But each additional result after that comes two per clock cycle for as many as you want to produce... The memory can keep up perfectly because a single cpu can read four words per cycle and write two. I haven't studied the G's so I don't know how everything is implemented there.
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