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Two small in-register-lookups
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Gerd Isenberg



Joined: 08 Mar 2006
Posts: 1785
Location: Hattingen, Germany
PostPost subject: Re: Two small in-register-lookups    Posted: Tue Apr 24, 2007 9:57 pm Reply to topic Reply with quote
hgm wrote:
You can XOR the squares first, and then do the test for one square.

Code:
bool sameSquareColor(unsigned int sq1, unsigned int sq2) {
    sq1 ^= sq2;
    return  ( (0xAA55AA55 >> sq1) & 1);
}


Of course! Looks quite competetive now.

Code:
?sameSquareColor@@YA_NII@Z PROC
  00000   33 ca       xor    ecx, edx
  00002   b8 55 aa 55 aa    mov    eax, aa55aa55H
  00005   d3 e8       shr    eax, cl
  00007   83 e0 01    and    eax, 1
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Subject Author Date/Time
Two small in-register-lookups Gerd Isenberg Mon Apr 23, 2007 10:28 pm
      Re: Two small in-register-lookups J. Wesley Cleveland Tue Apr 24, 2007 9:08 am
            Re: Two small in-register-lookups H.G.Muller Tue Apr 24, 2007 9:51 am
                  Re: Two small in-register-lookups Gerd Isenberg Tue Apr 24, 2007 11:00 am
            Re: Two small in-register-lookups Gerd Isenberg Tue Apr 24, 2007 10:58 am
                  Re: Two small in-register-lookups H.G.Muller Tue Apr 24, 2007 12:37 pm
                        Re: Two small in-register-lookups Gerd Isenberg Tue Apr 24, 2007 6:36 pm
                              Re: Two small in-register-lookups Gerd Isenberg Tue Apr 24, 2007 8:11 pm
                                    Re: Two small in-register-lookups H.G.Muller Tue Apr 24, 2007 9:48 pm
                                          Re: Two small in-register-lookups Gerd Isenberg Tue Apr 24, 2007 9:57 pm
                                                Re: Two small in-register-lookups Tord Romstad Wed Apr 25, 2007 7:40 am
                                                      Re: Two small in-register-lookups H.G.Muller Wed Apr 25, 2007 9:49 am
                                                            Re: Two small in-register-lookups Tord Romstad Wed Apr 25, 2007 10:53 am
                                                                  Re: Two small in-register-lookups H.G.Muller Wed Apr 25, 2007 12:01 pm
                                                      Re: Two small in-register-lookups Gerd Isenberg Fri Apr 27, 2007 7:41 pm
                        Re: Two small in-register-lookups Gerd Isenberg Fri Apr 27, 2007 7:44 pm
Post new topic    TalkChess.com Forum Index -> Computer Chess Club: Programming and Technical Discussions

 
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