From: Marco Costalba <mcostalba@gmail.com>
Date: Mon, 7 Apr 2014 14:27:14 +0000 (+0200)
Subject: Implement PEXT based attacks
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=c556fe1d716fcef3215c239f02b314ec7b42f0d1

Implement PEXT based attacks

According to:

https://chessprogramming.wikispaces.com/BMI2#PEXTBitboards

No functional change.
---

diff --git a/src/bitboard.cpp b/src/bitboard.cpp
index 27ba6574..b7fce20d 100644
--- 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
diff --git a/src/bitboard.h b/src/bitboard.h
index 140867fa..cd6c280c 100644
--- a/src/bitboard.h
+++ b/src/bitboard.h
@@ -243,6 +243,9 @@ FORCE_INLINE unsigned magic_index(Square s, Bitboard occ) {
   Bitboard* const Magics = Pt == ROOK ? RMagics : BMagics;
   unsigned* const Shifts = Pt == ROOK ? RShifts : BShifts;
 
+  if (HasPext)
+      return unsigned(pext(occ, Masks[s]));
+
   if (Is64Bit)
       return unsigned(((occ & Masks[s]) * Magics[s]) >> Shifts[s]);
 
diff --git a/src/types.h b/src/types.h
index 7ebe3f61..5dcfe51e 100644
--- a/src/types.h
+++ b/src/types.h
@@ -79,6 +79,12 @@ const bool HasPopCnt = true;
 const bool HasPopCnt = false;
 #endif
 
+#ifdef USE_PEXT
+const bool HasPext = true;
+#else
+const bool HasPext = false;
+#endif
+
 #ifdef IS_64BIT
 const bool Is64Bit = true;
 #else