Author: Roy Eassa
Date: 06:18:12 12/08/00
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On December 08, 2000 at 05:57:37, Vincent Diepeveen wrote: >On December 07, 2000 at 15:20:02, Roy Eassa wrote: > >>But what impact, if any, does floating point have on such chess apps as Crafty, >>Chess Tiger, Fritz, Junior, Hiarcs, Shredder, et. al.? (E.g., which would help >>them more: a 50% boost in integer speed only, or a 200% boost in floating speed >>only?) > >First of all you need to be completely assembly to make usage of >floating point. secondly what INSTRUCTIONS from FPU do you plan >to use? > >I guess doing everything in FPU in C would slow down a >program 4 times or so? > >Just keeping hashing in the FPU casted to MMX is of course a >possibility. That would be the only possible usage of MMX/FPU as >far as i can see. > >But does 0.5% speedup makeup for rewriting your entire program? <snip> Didn't mean to imply that I'm writing a program. No time to do that. I was just curious what attributes/benchmarks of a CPU most closely correspond to increased chess program strength. I use computers based on both PowerPC and x86, and know that PowerPC is (much) better at a given MHz for floating point (as I recall). But I think x86 holds its own at integer, and is of course available in much higher MHz (1200 [even 1500 for P4] versus 500 [soon 700?] for PPC-G4). For Photoshop (etc.), the PPC is generally faster, even at the lower MHz. But I now have confirmed what I suspected -- an identical algorithm for chess would likely play stronger on a 1.2 GHz Athlon than a 700 MHz PPC-G4.
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