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This Question Should Be An Easy One
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George Speight



Joined: 10 Mar 2006
Posts: 4545
PostPost subject: Re: This Question Should Be An Easy One    Posted: Sat Apr 07, 2012 3:26 pm Reply to topic Reply with quote
velmarin wrote:
The POPCNT only count the number of bits how you say,
Just note, this is very important in a motor bitboard.
but do so in a more elaborate, or do it using the instructions in the processor, there is a difference in speed.
The same applies to the instructions _BitScanForward64
they have the first bit, or the reverse, also SSE4 instructions, all give a gain in speed.
Prefetch is important, but I do not think so significant.



Thank you, Jose. You know this stuff well.


Best,

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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