Author: Eugene Nalimov
Date: 16:53:24 12/09/03
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On December 09, 2003 at 19:33:33, Jeremiah Penery wrote: >On December 09, 2003 at 13:48:49, Eugene Nalimov wrote: > >>On December 09, 2003 at 13:30:11, Slater Wold wrote: > >>>I'd be confident in this statement however: "64-bits, depending on application, >>>can speedup a typical chess program from 40% to 70%." >>> >>>Which is nice, considering it is practically 'free'. >> >>I am not so sure. >> >>Please take a look at one of the recent Opteron SPEC admissions: >>http://www.spec.org/cpu2000/results/res2003q4/cpu2000-20030922-02519.html. >> >>3 out of 12 programs (1/4 of all programs) were compiled with "-m32" flag, >>because they are faster in 32-bit mode. > >I wonder if that is really because they're ideally faster in 32-bit, or because >the AMD64 compiler is still a bit immature. At least one of them is much faster in 32-bit mode (181.mcf). It heavily works with linked lists, and you can fit 2x more 32-pointers in the cache than you can fit 64-bit ones. Not sure about other two. Thanks, Eugene
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