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Two small in-register-lookups
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H.G.Muller



Joined: 10 Mar 2006
Posts: 12753
Location: Amsterdam
PostPost subject: Re: Two small in-register-lookups    Posted: Tue Apr 24, 2007 12:37 pm Reply to topic Reply with quote
You could of course replace the (sqr>>3^sqr)&1 by
Code:
9*sqr & 8

for the purpose of making a boolean.

The multiplication could be implemented with a single LEA instruction:
Code:
    movl  _sqr, %eax
    leal (%eax, %eax, 8), %eax
    andl  $8, %eax
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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
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