Author: Gerd Isenberg
Date: 01:11:32 12/02/02
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On December 02, 2002 at 02:49:38, Joel wrote: >Hey Gerd, > >I will try your code out once I get home from work. I am using bsf at the >moment, (it was marginally faster than my mod 67 idea). > >If anyone is interested, my chess engine is slowly progressing, it can play now >(albeit using a minimax search), has an opening book, transposition table, and s >simple evalution. Will be implementing internal iterative deepening shortly >after I have written a few more useful benchmarking utilities for it. > >Just wondering though, how do you detect whether a CPU is 3DNow enabled? > >Regards, >Joel Hi Joel, As long as my program plays only on my private athlon... There is the CPUID instruction, see AMD 3DNow! Technology Manual, Feature Detection... mov eax,80000000h ;query for extended functions CPUID ;get extended function limit cmp eax,80000000h ;is 8000_0001h supported? jbe NO_EXTENDEDMSR ;if not,3DNow!tech.not supported mov eax,80000001h ;setup ext.function 8000_0001h CPUID ;call the function test edx,80000000h ;test bit 31 jnz YES_3DNow! ;3DNow!technology supported Gerd
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