Speedup sliders attacks for 32bit CPU

[stockfish] / src / bitboard.h

diff --git a/src/bitboard.h b/src/bitboard.h
index 3b82e2dad88f393b9c49a5b9414bafb55f0b5c34..24ae794b68b0f4183087a882cb94ca1bd64cc29c 100644 (file)
--- a/src/bitboard.h
+++ b/src/bitboard.h
@@ -23,62 +23,45 @@
 
 #include "types.h"
 
+CACHE_LINE_ALIGNMENT
+
+extern Bitboard RMasks[64];
+extern Bitboard RMagics[64];
+extern Bitboard* RAttacks[64];
+extern unsigned RShifts[64];
+
+extern Bitboard BMasks[64];
+extern Bitboard BMagics[64];
+extern Bitboard* BAttacks[64];
+extern unsigned BShifts[64];
+
+extern Bitboard SquareBB[64];
 extern Bitboard FileBB[8];
+extern Bitboard RankBB[8];
 extern Bitboard AdjacentFilesBB[8];
 extern Bitboard ThisAndAdjacentFilesBB[8];
-extern Bitboard RankBB[8];
 extern Bitboard InFrontBB[2][8];
-
-extern Bitboard SetMaskBB[65];
-extern Bitboard ClearMaskBB[65];
-
 extern Bitboard StepAttacksBB[16][64];
 extern Bitboard BetweenBB[64][64];
-
 extern Bitboard SquaresInFrontMask[2][64];
 extern Bitboard PassedPawnMask[2][64];
 extern Bitboard AttackSpanMask[2][64];
-
-extern uint64_t RMagics[64];
-extern int RShifts[64];
-extern Bitboard RMasks[64];
-extern Bitboard* RAttacks[64];
-
-extern uint64_t BMagics[64];
-extern int BShifts[64];
-extern Bitboard BMasks[64];
-extern Bitboard* BAttacks[64];
-
 extern Bitboard PseudoAttacks[6][64];
 
-extern uint8_t BitCount8Bit[256];
-
 
-/// Functions for testing whether a given bit is set in a bitboard, and for
-/// setting and clearing bits.
+/// Overloads of bitwise operators between a Bitboard and a Square for testing
+/// whether a given bit is set in a bitboard, and for setting and clearing bits.
 
-inline Bitboard bit_is_set(Bitboard b, Square s) {
-  return b & SetMaskBB[s];
+inline Bitboard operator&(Bitboard b, Square s) {
+  return b & SquareBB[s];
 }
 
-inline void set_bit(Bitboard* b, Square s) {
-  *b |= SetMaskBB[s];
+inline Bitboard& operator|=(Bitboard& b, Square s) {
+  return b |= SquareBB[s], b;
 }
 
-inline void clear_bit(Bitboard* b, Square s) {
-  *b &= ClearMaskBB[s];
-}
-
-
-/// Functions used to update a bitboard after a move. This is faster
-/// then calling a sequence of clear_bit() + set_bit()
-
-inline Bitboard make_move_bb(Square from, Square to) {
-  return SetMaskBB[from] | SetMaskBB[to];
-}
-
-inline void do_move_bb(Bitboard* b, Bitboard move_bb) {
-  *b ^= move_bb;
+inline Bitboard& operator^=(Bitboard& b, Square s) {
+  return b ^= SquareBB[s], b;
 }
 
 
@@ -140,33 +123,36 @@ inline Bitboard in_front_bb(Color c, Square s) {
 
 #if defined(IS_64BIT)
 
-FORCE_INLINE unsigned rook_index(Square s, Bitboard occ) {
+FORCE_INLINE unsigned r_index(Square s, Bitboard occ) {
   return unsigned(((occ & RMasks[s]) * RMagics[s]) >> RShifts[s]);
 }
 
-FORCE_INLINE unsigned bishop_index(Square s, Bitboard occ) {
+FORCE_INLINE unsigned b_index(Square s, Bitboard occ) {
   return unsigned(((occ & BMasks[s]) * BMagics[s]) >> BShifts[s]);
 }
 
 #else // if !defined(IS_64BIT)
 
-FORCE_INLINE unsigned rook_index(Square s, Bitboard occ) {
-  Bitboard b = occ & RMasks[s];
-  return unsigned(int(b) * int(RMagics[s]) ^ int(b >> 32) * int(RMagics[s] >> 32)) >> RShifts[s];
+FORCE_INLINE unsigned r_index(Square s, Bitboard occ) {
+  unsigned lo = unsigned(occ) & unsigned(RMasks[s]);
+  unsigned hi = unsigned(occ >> 32) & unsigned(RMasks[s] >> 32);
+  return (lo * unsigned(RMagics[s]) ^ hi * unsigned(RMagics[s] >> 32)) >> RShifts[s];
 }
 
-FORCE_INLINE unsigned bishop_index(Square s, Bitboard occ) {
-  Bitboard b = occ & BMasks[s];
-  return unsigned(int(b) * int(BMagics[s]) ^ int(b >> 32) * int(BMagics[s] >> 32)) >> BShifts[s];
+FORCE_INLINE unsigned b_index(Square s, Bitboard occ) {
+  unsigned lo = unsigned(occ) & unsigned(BMasks[s]);
+  unsigned hi = unsigned(occ >> 32) & unsigned(BMasks[s] >> 32);
+  return (lo * unsigned(BMagics[s]) ^ hi * unsigned(BMagics[s] >> 32)) >> BShifts[s];
 }
+
 #endif
 
 inline Bitboard rook_attacks_bb(Square s, Bitboard occ) {
-  return RAttacks[s][rook_index(s, occ)];
+  return RAttacks[s][r_index(s, occ)];
 }
 
 inline Bitboard bishop_attacks_bb(Square s, Bitboard occ) {
-  return BAttacks[s][bishop_index(s, occ)];
+  return BAttacks[s][b_index(s, occ)];
 }
 
 
@@ -215,7 +201,7 @@ inline Bitboard attack_span_mask(Color c, Square s) {
 
 inline bool squares_aligned(Square s1, Square s2, Square s3) {
   return  (BetweenBB[s1][s2] | BetweenBB[s1][s3] | BetweenBB[s2][s3])
-        & (    SetMaskBB[s1] |     SetMaskBB[s2] |     SetMaskBB[s3]);
+        & (     SquareBB[s1] |      SquareBB[s2] |      SquareBB[s3]);
 }
 
 
@@ -223,8 +209,8 @@ inline bool squares_aligned(Square s1, Square s2, Square s3) {
 /// the same color of the given square.
 
 inline Bitboard same_color_squares(Square s) {
-  return bit_is_set(0xAA55AA55AA55AA55ULL, s) ?  0xAA55AA55AA55AA55ULL
-                                              : ~0xAA55AA55AA55AA55ULL;
+  return Bitboard(0xAA55AA55AA55AA55ULL) & s ?  0xAA55AA55AA55AA55ULL
+                                             : ~0xAA55AA55AA55AA55ULL;
 }