Re: [gnugo-devel] fastlib optimization

[Trevor Morris]

I think that Paul's optimization is correct, and should cover even
more cases.  I've been fooled before, though.  This message
contains the relevant part of Paul's patch:

http://mail.gnu.org/pipermail/gnugo-devel/2002-October/003148.html

At 02:19 PM 10/18/2002 -0400, Evan Berggren Daniel wrote:
>This one liner slightly expands the cases where fastlib works, improving
>the speed of approxlib by ~10%  (my profile is fairly noisy, though, so
>this could be somewhat off in either direction).
>
>Regression delta should be zero, but I haven't checked everything
>(reading.tst and owl1.tst).
>
>Thanks
>
>Evan
>
>
>Index: engine/board.c
>===================================================================
>RCS file: /cvsroot/gnugo/gnugo/engine/board.c,v
>retrieving revision 1.53
>diff -u -r1.53 board.c
>--- engine/board.c      14 Oct 2002 17:02:57 -0000      1.53
>+++ engine/board.c      18 Oct 2002 15:39:26 -0000
>@@ -2065,7 +2065,7 @@
>       if ((neighbor_size <= 2 && !ally1)
>           || (neighbor_size == 1
>               && ally1
>-              && !ally2
>+              && (!ally2 || COUNTSTONES(ally2) == 1)
>               && COUNTSTONES(ally1) == 1)) {
>         /* Here, we can gain only the adjacent new liberty. */
>         fast_liberties++;
>
>
>
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