Author: Jeremiah Penery
Date: 12:38:44 04/04/00
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On April 04, 2000 at 11:48:35, Tom Kerrigan wrote: >On April 04, 2000 at 07:53:30, Laurence Chen wrote: > >>It could be that crafty uses SSE in the code, and that improves the speed of >>searching in Crafty. SSE is properitery of Intel, and Athlon does not and >>cannot support SSE, and instead of SSE, AMD replaces this part of code with 3D! >>Now. > >If you do many similar floating point operations, you can use SSE to optimize >your code. > >Crafty doesn't do any floating point operations, so using SSE is impossible. > >It's possible that Crafty uses MMX for some stuff. I kind of doubt it, but MMX >might be used to speed up some 64-bit operations. AMD's chips have always done >MMX operations much faster than Intel's chips, so that would tend to make the >K6/Athlon faster than the PIII. Wouldn't MMX stuff be rather non-portable? I think part of the reason is that as long as MSVC is used to compile it, Crafty has some Intel-tuned assembly code for heavily used time-critical code. The stuff will work on AMD, I think, but it will be slower.
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