X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fbitboard.cpp;h=e4e409583bcd4b71ebc0bc853746a7c6b0062f1c;hp=b36f8a291d77647b5af8d1888bc83efabf0542d3;hb=aa392c366e6b52fa51b4be7965347d867a7f9804;hpb=22b9307aba0f78aa92abcf85e807af8b64011c7a

diff --git a/src/bitboard.cpp b/src/bitboard.cpp
index b36f8a29..e4e40958 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) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 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
@@ -17,16 +17,14 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#include <algorithm>
 #include <cstring>
 #include <iostream>
-#include <algorithm>
 
 #include "bitboard.h"
 #include "bitcount.h"
 #include "rkiss.h"
 
-// Global bitboards definitions with static storage duration are
-// automatically set to zero before enter main().
 Bitboard RMasks[64];
 Bitboard RMagics[64];
 Bitboard* RAttacks[64];
@@ -40,7 +38,6 @@ int BShifts[64];
 Bitboard SetMaskBB[65];
 Bitboard ClearMaskBB[65];
 
-Bitboard SquaresByColorBB[2];
 Bitboard FileBB[8];
 Bitboard RankBB[8];
 Bitboard NeighboringFilesBB[8];
@@ -151,20 +148,13 @@ Square pop_1st_bit(Bitboard* bb) {
 #endif // !defined(USE_BSFQ)
 
 
-/// init_bitboards() initializes various bitboard arrays. It is called during
+/// bitboards_init() initializes various bitboard arrays. It is called during
 /// program initialization.
 
-void init_bitboards() {
+void bitboards_init() {
 
   for (Bitboard b = 0; b < 256; b++)
-      BitCount8Bit[b] = (uint8_t)count_1s<CNT32_MAX15>(b);
-
-  for (Square s1 = SQ_A1; s1 <= SQ_H8; s1++)
-      for (Square s2 = SQ_A1; s2 <= SQ_H8; s2++)
-          SquareDistance[s1][s2] = std::max(file_distance(s1, s2), rank_distance(s1, s2));
-
-  SquaresByColorBB[DARK]  =  0xAA55AA55AA55AA55ULL;
-  SquaresByColorBB[LIGHT] = ~SquaresByColorBB[DARK];
+      BitCount8Bit[b] = (uint8_t)popcount<Max15>(b);
 
   for (Square s = SQ_A1; s <= SQ_H8; s++)
   {
@@ -172,7 +162,7 @@ void init_bitboards() {
       ClearMaskBB[s] = ~SetMaskBB[s];
   }
 
-  ClearMaskBB[SQ_NONE] = ~EmptyBoardBB;
+  ClearMaskBB[SQ_NONE] = ~0ULL;
 
   FileBB[FILE_A] = FileABB;
   RankBB[RANK_1] = Rank1BB;
@@ -199,12 +189,16 @@ void init_bitboards() {
       for (Square s = SQ_A1; s <= SQ_H8; s++)
       {
           SquaresInFrontMask[c][s] = in_front_bb(c, s) & file_bb(s);
-          PassedPawnMask[c][s]     = in_front_bb(c, s) & this_and_neighboring_files_bb(s);
-          AttackSpanMask[c][s]     = in_front_bb(c, s) & neighboring_files_bb(s);
+          PassedPawnMask[c][s]     = in_front_bb(c, s) & this_and_neighboring_files_bb(file_of(s));
+          AttackSpanMask[c][s]     = in_front_bb(c, s) & neighboring_files_bb(file_of(s));
       }
 
+  for (Square s1 = SQ_A1; s1 <= SQ_H8; s1++)
+      for (Square s2 = SQ_A1; s2 <= SQ_H8; s2++)
+          SquareDistance[s1][s2] = std::max(file_distance(s1, s2), rank_distance(s1, s2));
+
   for (int i = 0; i < 64; i++)
-      if (!CpuIs64Bit) // Matt Taylor's folding trick for 32 bit systems
+      if (!Is64Bit) // Matt Taylor's folding trick for 32 bit systems
       {
           Bitboard b = 1ULL << i;
           b ^= b - 1;
@@ -233,9 +227,9 @@ void init_bitboards() {
 
   for (Square s = SQ_A1; s <= SQ_H8; s++)
   {
-      BishopPseudoAttacks[s] = bishop_attacks_bb(s, EmptyBoardBB);
-      RookPseudoAttacks[s]   = rook_attacks_bb(s, EmptyBoardBB);
-      QueenPseudoAttacks[s]  = queen_attacks_bb(s, EmptyBoardBB);
+      BishopPseudoAttacks[s] = bishop_attacks_bb(s, 0);
+      RookPseudoAttacks[s]   = rook_attacks_bb(s, 0);
+      QueenPseudoAttacks[s]  = queen_attacks_bb(s, 0);
   }
 
   for (Square s1 = SQ_A1; s1 <= SQ_H8; s1++)
@@ -276,6 +270,7 @@ namespace {
     return attacks;
   }
 
+
   Bitboard pick_random(Bitboard mask, RKISS& rk, int booster) {
 
     Bitboard magic;
@@ -325,8 +320,8 @@ namespace {
         // all the attacks for each possible subset of the mask and so is 2 power
         // the number of 1s of the mask. Hence we deduce the size of the shift to
         // apply to the 64 or 32 bits word to get the index.
-        masks[s]  = sliding_attacks(pt, s, EmptyBoardBB) & ~edges;
-        shifts[s] = (CpuIs64Bit ? 64 : 32) - count_1s<CNT32_MAX15>(masks[s]);
+        masks[s]  = sliding_attacks(pt, s, 0) & ~edges;
+        shifts[s] = (Is64Bit ? 64 : 32) - popcount<Max15>(masks[s]);
 
         // Use Carry-Rippler trick to enumerate all subsets of masks[s] and
         // store the corresponding sliding attacks bitboard in reference[].
@@ -342,7 +337,7 @@ namespace {
         if (s < SQ_H8)
             attacks[s + 1] = attacks[s] + size;
 
-        booster = MagicBoosters[CpuIs64Bit][rank_of(s)];
+        booster = MagicBoosters[Is64Bit][rank_of(s)];
 
         // Find a magic for square 's' picking up an (almost) random number
         // until we find the one that passes the verification test.