Implement PEXT based attacks

[stockfish] / src / bitboard.cpp

diff --git a/src/bitboard.cpp b/src/bitboard.cpp
index 27ba65747d6faf05cf4cdb3e2442aa0f0b7cdbe6..b7fce20d9206a4fdab6716ef7158b08e27a5b12f 100644 (file)
--- a/src/bitboard.cpp
+++ b/src/bitboard.cpp
@@ -296,7 +296,12 @@ namespace {
         b = size = 0;
         do {
             occupancy[size] = b;
-            reference[size++] = sliding_attack(deltas, s, b);
+            reference[size] = sliding_attack(deltas, s, b);
+
+            if (HasPext)
+                attacks[s][pext(occupancy[size], masks[s])] = reference[size];
+
+            size++;
             b = (b - masks[s]) & masks[s];
         } while (b);
 
@@ -305,6 +310,9 @@ namespace {
         if (s < SQ_H8)
             attacks[s + 1] = attacks[s] + size;
 
+        if (HasPext)
+            continue;
+
         booster = MagicBoosters[Is64Bit][rank_of(s)];
 
         // Find a magic for square 's' picking up an (almost) random number