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Black magic bitboards
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Ronald de Man



Joined: 28 Feb 2012
Posts: 3455

PostPost subject: Re: Black magic bitboards    Posted: Sat Aug 12, 2017 3:09 pm Reply to topic Reply with quote

syzygy wrote:
Results on my Kabylake laptop for "cfish bench 128 1 17 >/dev/null" (nps):
Code:
fancy magics   2321090
white magics   2343727
black magics   2353732
plain bmi2     2355310
fancy bmi2     2364420

Redirecting stderr to a file seems to remove some further disturbances. I now get this:
Code:
fancy magics   2337686
white magics   2362632
black magics   2362235
plain bmi2     2372801
fancy bmi2     2381846

Again I keep the best results (least disturbed by random OS stuff).

It seems white magics and black magics are virtually indistinguishable in performance.

BMI2 is still better, but Volker's overlapping-table approach gets pretty close.
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Subject Author Date/Time
Black magic bitboards Volker Annuss Thu Aug 03, 2017 3:24 pm
      Re: Black magic bitboards Gerd Isenberg Thu Aug 03, 2017 7:34 pm
            Re: Black magic bitboards Volker Annuss Thu Aug 03, 2017 8:52 pm
            Re: Black magic bitboards Oliver Roese Fri Aug 04, 2017 12:29 am
                  Re: Black magic bitboards Álvaro Begué Fri Aug 04, 2017 1:07 am
                        Re: Black magic bitboards Oliver Roese Fri Aug 04, 2017 1:27 am
                              Re: Black magic bitboards Álvaro Begué Fri Aug 04, 2017 2:07 am
                                    Re: Black magic bitboards Oliver Roese Fri Aug 04, 2017 2:21 am
                                          Re: Black magic bitboards Álvaro Begué Fri Aug 04, 2017 2:24 am
                                                Re: Black magic bitboards Oliver Roese Fri Aug 04, 2017 2:30 am
                        Re: Black magic bitboards Gerd Isenberg Fri Aug 04, 2017 7:24 am
            Re: Black magic bitboards Volker Annuss Fri Aug 04, 2017 10:59 am
                  Re: Black magic bitboards Álvaro Begué Fri Aug 04, 2017 11:06 am
                        Re: Black magic bitboards Volker Annuss Fri Aug 04, 2017 3:18 pm
                        Re: Black magic bitboards Volker Annuss Sun Aug 06, 2017 8:31 am
                  Re: Black magic bitboards Gerd Isenberg Fri Aug 04, 2017 11:50 am
                        Re: Black magic bitboards Volker Annuss Fri Aug 04, 2017 2:53 pm
      Re: Black magic bitboards Niklas Fiekas Sat Aug 12, 2017 8:26 am
            Re: Black magic bitboards Ronald de Man Sat Aug 12, 2017 1:43 pm
                  Re: Black magic bitboards Ronald de Man Sat Aug 12, 2017 3:09 pm
                  Re: Black magic bitboards Volker Annuss Sun Aug 13, 2017 7:04 am
                        Re: Black magic bitboards Ronald de Man Sun Aug 13, 2017 3:19 pm
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