Author: Robert Hyatt
Date: 19:12:04 02/08/03
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On February 08, 2003 at 17:15:20, Tom Kerrigan wrote: >On February 07, 2003 at 23:29:42, Robert Hyatt wrote: > >>Go back 30 years to the HP 2100 micro-programmable machine. The >>micro-instructions were similar in concept with the IA64 in a gross way, >>yet we had students programming that machine with no problems. It is different. >>It requires a bit of "new thinking". But multiple instruction parcels in a >>single long word is not _that_ bad... > >It's not just multiple instructions in one word. > >Have you done any IA-64 programming yourself or talked with someone who has? I have not done any yet. I have not had an IA64 box here where I could play with it, except for a brief evaluation a while back, so I don't speak from IA64 experience. I have talked with people that have done this. And I have experience with other types of VLIW machines. Steve Chen left Cray years ago to form a company to build a VLIW supercomputer. I have some docs for that, for example... It's "different". But then so is a vector instruction set. But I wouldn't call either "hard to do" unless you factor in the learning curve which does take some time... >Because everybody I know who has has one thing to say about it: it's such a pain >that you shouldn't bother trying. I know people that used to say that about a Cray with its "very riscy" instruction set. RISC = Really Invented by Seymour Cray... > >-Tom
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