Author: Tom Kerrigan
Date: 11:57:33 03/25/02
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On March 25, 2002 at 04:53:32, Sune Fischer wrote: >On March 25, 2002 at 01:33:46, Tom Kerrigan wrote: > >>Yes, rah rah, go Alpha. But how are we supposed to use these NPS numbers to >>guess how much faster the Hammer will be than the AXP? (Which, BTW, is the issue >>at hand.) > >Actually the issue was how much could be gained in going from 32 to 64 bit. > >But talking about the Hammer, I read this on Anandtech and was surprised to read >about having to turn on 64-bit data oprands with a REX instruction? >If we have to go assembler everytime we want to do a 64-bit operation, the >Hammer is almost useless, at least to me. x86-64 compilers should be able to handle this seamlessly, so no need to use assembly. Also, you can do 64-bit operations without 64-bit immediate operands (e.g., register-register instructions). Actually, I believe it's impossible to even have 64-bit immediates in all of the major 64-bit RISC instruction sets. -Tom
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