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Speedup with bitboards on 64-bit CPUs
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Tord Romstad



Joined: 08 Mar 2006
Posts: 1750
Location: Oslo, Norway
PostPost subject: Re: Speedup with bitboards on 64-bit CPUs    Posted: Mon Apr 30, 2007 3:22 pm Reply to topic Reply with quote
frankp wrote:
This strikes a cord. I was writing a new 0x88 program for the Palm z22 I bought recently, but it was just too slow (on the pc) so I have gone back to bitboards mainly because this is the way I think. Eval on 0x88 was so hard. I guess it is familiarity that matters. There seems no intrinsic reason why 0x88 would not be as fast. (Bitboards will be no good for the z22 of course.).

In my opinion, 0x88 is obsolete. It is similar to mailbox, but less intuitive and somewhat slower, without offering any advantages in compensation.

Personally, I can neither think in terms of bitboards nor in terms of mailbox boards. The only way I can think about chess programming is in terms of higher-level terms. I try to isolate the the parts of my program that make use of the internals of my board representation to a few low-level functions, and keep the interesting parts of my search and evaluation agnostic to the board representation. Most of my code is exactly the same with bitboards and mailbox.

Quote:
To answer your question, IIRC my old bitboard program got the order of 50% speedup moving to amd64 (gcc/Linux), but does not use rotated bitboards.

Not bad! If my results turn out to be similar, it is likely that my bitboard version will be faster than the mailbox version on a 64-bit CPU.

Thanks to everyone for the answers! I'm getting more optimistic now.

Tord
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Subject Author Date/Time
Speedup with bitboards on 64-bit CPUs Tord Romstad Fri Apr 27, 2007 8:39 am
      Re: Speedup with bitboards on 64-bit CPUs Mark Lefler Fri Apr 27, 2007 9:34 am
            Re: Speedup with bitboards on 64-bit CPUs Tord Romstad Fri Apr 27, 2007 11:04 am
                  Re: Speedup with bitboards on 64-bit CPUs Pradu Kannan Fri Apr 27, 2007 11:15 am
                  Re: Speedup with bitboards on 64-bit CPUs jswaff Sat Apr 28, 2007 12:21 am
      Re: Speedup with bitboards on 64-bit CPUs H.G.Muller Fri Apr 27, 2007 10:20 am
            Re: Speedup with bitboards on 64-bit CPUs Tord Romstad Fri Apr 27, 2007 11:13 am
                  Re: Speedup with bitboards on 64-bit CPUs Pradu Kannan Fri Apr 27, 2007 11:18 am
                        Re: Speedup with bitboards on 64-bit CPUs Tord Romstad Mon Apr 30, 2007 3:01 pm
                  Re: Speedup with bitboards on 64-bit CPUs Robert Hyatt Sun Apr 29, 2007 12:34 am
                        Re: Speedup with bitboards on 64-bit CPUs Tord Romstad Mon Apr 30, 2007 3:14 pm
                              Re: Speedup with bitboards on 64-bit CPUs Robert Hyatt Mon Apr 30, 2007 5:08 pm
                                    post gone?? Guetti Tue May 01, 2007 8:26 pm
                                          Re: post gone?? Gerd Isenberg Wed May 02, 2007 6:36 am
                                                Re: post gone?? Guetti Wed May 02, 2007 7:54 am
                                                Re: post gone?? H.G.Muller Wed May 02, 2007 3:47 pm
                                                      Re: post gone?? Gerd Isenberg Wed May 02, 2007 6:08 pm
      Re: Speedup with bitboards on 64-bit CPUs Charles Roberson Fri Apr 27, 2007 1:45 pm
            Re: Speedup with bitboards on 64-bit CPUs Vincent Diepeveen Sat May 19, 2007 5:20 pm
                  Re: Speedup with bitboards on 64-bit CPUs Robert Hyatt Mon May 21, 2007 5:34 pm
                  Re: Speedup with bitboards on 64-bit CPUs Tony Thomas Mon May 21, 2007 5:40 pm
                        Re: Speedup with bitboards on 64-bit CPUs Robert Hyatt Mon May 21, 2007 9:47 pm
                              Re: Speedup with bitboards on 64-bit CPUs Vincent Diepeveen Sat May 26, 2007 7:21 pm
                                    Re: Speedup with bitboards on 64-bit CPUs Robert Hyatt Sun May 27, 2007 9:41 pm
                                          Re: Speedup with bitboards on 64-bit CPUs Chan Rasjid Mon May 28, 2007 7:29 am
                                                Re: Speedup with bitboards on 64-bit CPUs Tony Thomas Mon May 28, 2007 9:04 pm
                                                Re: Speedup with bitboards on 64-bit CPUs Jacob Mon May 28, 2007 9:49 pm
                                                      Re: Speedup with bitboards on 64-bit CPUs Chan Rasjid Tue May 29, 2007 5:58 am
                                                            Re: Speedup with bitboards on 64-bit CPUs Robert Hyatt Tue May 29, 2007 3:18 pm
                                                                  Re: Speedup with bitboards on 64-bit CPUs Chan Rasjid Tue May 29, 2007 4:09 pm
                                                                        Re: Speedup with bitboards on 64-bit CPUs Robert Hyatt Tue May 29, 2007 9:23 pm
                                                                  Quiescence search width Steven Edwards Tue May 29, 2007 10:02 pm
                                                                        Re: Quiescence search width Greg McGlynn Wed May 30, 2007 3:36 pm
                                                                        Re: Quiescence search width Robert Hyatt Thu May 31, 2007 1:45 am
                                                                              Re: Quiescence search width Steven Edwards Thu May 31, 2007 2:16 am
                                                Re: Speedup with bitboards on 64-bit CPUs Robert Hyatt Tue May 29, 2007 3:15 pm
      Re: Speedup with bitboards on 64-bit CPUs Jon Dart Fri Apr 27, 2007 6:25 pm
            Re: Speedup with bitboards on 64-bit CPUs Michael Sherwin Fri Apr 27, 2007 11:32 pm
                  Re: Speedup with bitboards on 64-bit CPUs Robert Hyatt Sun Apr 29, 2007 12:38 am
                        Re: Speedup with bitboards on 64-bit CPUs Michael Sherwin Sun Apr 29, 2007 2:01 am
                              Re: Speedup with bitboards on 64-bit CPUs Robert Hyatt Mon Apr 30, 2007 12:41 am
      Re: Speedup with bitboards on 64-bit CPUs frank phillips Sat Apr 28, 2007 10:38 am
            Re: Speedup with bitboards on 64-bit CPUs Tord Romstad Mon Apr 30, 2007 3:22 pm
                  Re: Speedup with bitboards on 64-bit CPUs Robert Hyatt Mon Apr 30, 2007 8:59 pm
                        Re: Speedup with bitboards on 64-bit CPUs Michael Sherwin Tue May 01, 2007 9:55 am
                              Re: Speedup with bitboards on 64-bit CPUs Robert Hyatt Tue May 01, 2007 9:05 pm
                        Re: Speedup with bitboards on 64-bit CPUs H.G.Muller Tue May 01, 2007 11:38 am
                              Re: Speedup with bitboards on 64-bit CPUs Robert Hyatt Tue May 01, 2007 9:07 pm
      Re: Speedup with bitboards on 64-bit CPUs Shaun Brewer Tue May 01, 2007 11:20 pm
      Re: Speedup with bitboards on 64-bit CPUs Tord Romstad Fri May 11, 2007 8:16 am
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