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This Question Should Be An Easy One
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George Speight



Joined: 10 Mar 2006
Posts: 4639
PostPost subject: Re: This Question Should Be An Easy One    Posted: Sat Apr 07, 2012 3:23 pm Reply to topic Reply with quote
zullil wrote:
The POPCNT instruction simply counts the number of bits that are set to 1 in a binary word. Engines that use bitboards gain a speed benefit from having this instruction available on the cpu. If it isn't available, then the bit counting has to be done as a sequence of instructions, which takes longer.

Other SSE instructions are also beneficial. For example, the prefetch instruction. But I'm not a chess programmer, so I'll leave it here for the experts to elaborate upon.



You are not a programmer? You could have fooled me. Smile


Thanks Louis,

george
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Subject Author Date/Time
This Question Should Be An Easy One George Speight Sat Apr 07, 2012 12:42 pm
      Re: This Question Should Be An Easy One Louis Zulli Sat Apr 07, 2012 12:50 pm
            Re: This Question Should Be An Easy One George Speight Sat Apr 07, 2012 1:13 pm
                  Re: This Question Should Be An Easy One Louis Zulli Sat Apr 07, 2012 1:33 pm
                        Re: This Question Should Be An Easy One George Speight Sat Apr 07, 2012 2:13 pm
                              Re: This Question Should Be An Easy One George Speight Sat Apr 07, 2012 2:26 pm
                              Re: This Question Should Be An Easy One jose mē velasco Sat Apr 07, 2012 2:30 pm
                              Re: This Question Should Be An Easy One Louis Zulli Sat Apr 07, 2012 2:48 pm
                                    Re: This Question Should Be An Easy One jose mē velasco Sat Apr 07, 2012 3:09 pm
                                          Re: This Question Should Be An Easy One George Speight Sat Apr 07, 2012 3:26 pm
                                          Re: This Question Should Be An Easy One Louis Zulli Sat Apr 07, 2012 6:38 pm
                                    Re: This Question Should Be An Easy One George Speight Sat Apr 07, 2012 3:23 pm
                                          Re: This Question Should Be An Easy One Louis Zulli Sat Apr 07, 2012 3:45 pm
                        Re: This Question Should Be An Easy One George Speight Sat Apr 07, 2012 2:38 pm
      Re: This Question Should Be An Easy One Vael Jean-Paul Sat Apr 07, 2012 1:14 pm
            Re: This Question Should Be An Easy One George Speight Sat Apr 07, 2012 2:17 pm
      Re: This Question Should Be An Easy One Mike Scheidl Sat Apr 07, 2012 2:09 pm
            Re: This Question Should Be An Easy One George Speight Sat Apr 07, 2012 2:21 pm
                  Re: This Question Should Be An Easy One Mike Scheidl Sat Apr 07, 2012 3:21 pm
                        Re: This Question Should Be An Easy One George Speight Sat Apr 07, 2012 3:25 pm
                              ANOTHER RELATED IMPORTANT QUESTION George Speight Sat Apr 07, 2012 4:47 pm
                                    Re: ANOTHER RELATED IMPORTANT QUESTION E Diaz Sun Apr 08, 2012 8:15 am
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