X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fbitboard.cpp;h=f6504aa9098b6aa808cdc89d1957c5da18930c1f;hp=6ab90124aeaad62c4242926555a1539c68ba06a7;hb=1d5eaba5735e24c3afdeb07a5108d7ebf9e3ff57;hpb=3fda064a669c2bcecfa31d66c661efa7408499de

diff --git a/src/bitboard.cpp b/src/bitboard.cpp
index 6ab90124..f6504aa9 100644
--- a/src/bitboard.cpp
+++ b/src/bitboard.cpp
@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2014 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -249,7 +249,9 @@ namespace {
                              {  728, 10316, 55013, 32803, 12281, 15100,  16645,   255 } };
 
     Bitboard occupancy[4096], reference[4096], edges, b;
-    int i, size;
+    int age[4096], current = 0, i, size;
+
+    std::memset(age, 0, sizeof(age));
 
     // attacks[s] is a pointer to the beginning of the attacks table for square 's'
     attacks[SQ_A1] = table;
@@ -275,7 +277,7 @@ namespace {
             reference[size] = sliding_attack(deltas, s, b);
 
             if (HasPext)
-                attacks[s][_pext_u64(b, masks[s])] = reference[size];
+                attacks[s][pext(b, masks[s])] = reference[size];
 
             size++;
             b = (b - masks[s]) & masks[s];
@@ -298,22 +300,21 @@ namespace {
                 magics[s] = rng.sparse_rand<Bitboard>();
             while (popcount<Max15>((magics[s] * masks[s]) >> 56) < 6);
 
-            std::memset(attacks[s], 0, size * sizeof(Bitboard));
-
             // A good magic must map every possible occupancy to an index that
             // looks up the correct sliding attack in the attacks[s] database.
             // Note that we build up the database for square 's' as a side
             // effect of verifying the magic.
-            for (i = 0; i < size; ++i)
+            for (++current, i = 0; i < size; ++i)
             {
-                Bitboard& attack = attacks[s][index(s, occupancy[i])];
-
-                if (attack && attack != reference[i])
+                unsigned idx = index(s, occupancy[i]);
+
+                if (age[idx] < current)
+                {
+                    age[idx] = current;
+                    attacks[s][idx] = reference[i];
+                }
+                else if (attacks[s][idx] != reference[i])
                     break;
-
-                assert(reference[i]);
-
-                attack = reference[i];
             }
         } while (i < size);
     }