Added the possibility to compress tables to 2 bits per entry.

This is done similarly to nxopt: one base value is selected and entries
are memorized based on that base value. Values higher than base+3
are returned as base+3 (still a valid estimate) and values lower
or equal to base require a lookup on a "fallback" table, which
must give a valid estimate for the larger one (e.g. nxopt31 or khuge
can fallback to drud_sym16).
I have also added some info to the pruning table files: base value and
distribution. Unfortunately this means that everyone who has used nissy
2.0beta has to re-generate the tables.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/cubetypes.h b/src/cubetypes.h
index d1d36b2..7563abb 100644
--- a/src/cubetypes.h
+++ b/src/cubetypes.h
@@ -265,6 +265,11 @@ prunedata
         uint64_t                  n;
         Coordinate *              coord;
         Moveset *                 moveset;
+        bool                      compact;
+        int                       base;
+        uint64_t                  count[16];
+        PruneData *               fallback;
+        uint64_t                  fbmod;
 };
 
 struct