Re: [gnugo-devel] fastlib optimization

[Evan Berggren Daniel]

On Sat, 19 Oct 2002, Trevor Morris wrote:

> 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:

Agreed.

The following addition covers another case:

?O?
OXO
OXO
.*.
.O.
?.?

It is on top of Paul's patch.  I have not checked the speed improvement.
It's probably fairly irrelevant, actually.  But I coded it to see, so why
not send it in...

Evan Daniel

diff -u engine/board.c engine/board.c
--- engine/board.c      20 Oct 2002 17:35:37 -0000
+++ engine/board.c      21 Oct 2002 02:01:43 -0000
@@ -2082,7 +2082,9 @@
               && COUNTSTONES(ally1) == 1)) {
 #else
       if (neighbor_size == 1
-         || (neighbor_size == 2 && !ally1)) {
+         || (neighbor_size == 2 && !ally1)
+         || (neighbor_size == 2 && COUNTSTONES(ally1) == 1 &&
+                !neighbor_of_string(ally1, neighbor))) {
 #endif
         /* Here, we can gain only the adjacent new liberty. */
         fast_liberties++;