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[stockfish] / src / pawns.cpp

diff --git a/src/pawns.cpp b/src/pawns.cpp
index b3c65a0f166268200fb918d4a751f2563f7de378..950994ef898b4843a869cd22898dbf933ada88e8 100644 (file)
--- a/src/pawns.cpp
+++ b/src/pawns.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
@@ -72,14 +72,14 @@ namespace {
 }
 
 
-/// PawnInfoTable::get_pawn_info() takes a position object as input, computes
+/// PawnInfoTable::pawn_info() takes a position object as input, computes
 /// a PawnInfo object, and returns a pointer to it. The result is also stored
 /// in an hash table, so we don't have to recompute everything when the same
 /// pawn structure occurs again.
 
-PawnInfo* PawnInfoTable::get_pawn_info(const Position& pos) const {
+PawnInfo* PawnInfoTable::pawn_info(const Position& pos) const {
 
-  Key key = pos.get_pawn_key();
+  Key key = pos.pawn_key();
   PawnInfo* pi = probe(key);
 
   // If pi->key matches the position's pawn hash key, it means that we
@@ -116,7 +116,6 @@ template<Color Us>
 Score PawnInfoTable::evaluate_pawns(const Position& pos, Bitboard ourPawns,
                                     Bitboard theirPawns, PawnInfo* pi) {
 
-  const BitCountType Max15 = CpuIs64Bit ? CNT64_MAX15 : CNT32_MAX15;
   const Color Them = (Us == WHITE ? BLACK : WHITE);
 
   Bitboard b;
@@ -132,8 +131,8 @@ Score PawnInfoTable::evaluate_pawns(const Position& pos, Bitboard ourPawns,
   {
       assert(pos.piece_on(s) == make_piece(Us, PAWN));
 
-      f = square_file(s);
-      r = square_rank(s);
+      f = file_of(s);
+      r = rank_of(s);
 
       // This file cannot be half open
       pi->halfOpenFiles[Us] &= ~(1 << f);
@@ -146,22 +145,22 @@ Score PawnInfoTable::evaluate_pawns(const Position& pos, Bitboard ourPawns,
       passed   = !(theirPawns & passed_pawn_mask(Us, s));
       doubled  =   ourPawns   & squares_in_front_of(Us, s);
       opposed  =   theirPawns & squares_in_front_of(Us, s);
-      isolated = !(ourPawns   & neighboring_files_bb(f));
-      chain    =   ourPawns   & neighboring_files_bb(f) & b;
+      isolated = !(ourPawns   & adjacent_files_bb(f));
+      chain    =   ourPawns   & adjacent_files_bb(f) & b;
 
       // Test for backward pawn
       backward = false;
 
       // If the pawn is passed, isolated, or member of a pawn chain it cannot
-      // be backward. If there are friendly pawns behind on neighboring files
+      // be backward. If there are friendly pawns behind on adjacent files
       // or if can capture an enemy pawn it cannot be backward either.
       if (   !(passed | isolated | chain)
           && !(ourPawns & attack_span_mask(Them, s))
           && !(pos.attacks_from<PAWN>(s, Us) & theirPawns))
       {
           // We now know that there are no friendly pawns beside or behind this
-          // pawn on neighboring files. We now check whether the pawn is
-          // backward by looking in the forward direction on the neighboring
+          // pawn on adjacent files. We now check whether the pawn is
+          // backward by looking in the forward direction on the adjacent
           // files, and seeing whether we meet a friendly or an enemy pawn first.
           b = pos.attacks_from<PAWN>(s, Us);
 
@@ -179,17 +178,17 @@ Score PawnInfoTable::evaluate_pawns(const Position& pos, Bitboard ourPawns,
 
       // A not passed pawn is a candidate to become passed if it is free to
       // advance and if the number of friendly pawns beside or behind this
-      // pawn on neighboring files is higher or equal than the number of
-      // enemy pawns in the forward direction on the neighboring files.
+      // pawn on adjacent files is higher or equal than the number of
+      // enemy pawns in the forward direction on the adjacent files.
       candidate =   !(opposed | passed | backward | isolated)
-                 && (b = attack_span_mask(Them, s + pawn_push(Us)) & ourPawns) != EmptyBoardBB
-                 &&  count_1s<Max15>(b) >= count_1s<Max15>(attack_span_mask(Us, s) & theirPawns);
+                 && (b = attack_span_mask(Them, s + pawn_push(Us)) & ourPawns) != 0
+                 &&  popcount<Max15>(b) >= popcount<Max15>(attack_span_mask(Us, s) & theirPawns);
 
       // Passed pawns will be properly scored in evaluation because we need
       // full attack info to evaluate passed pawns. Only the frontmost passed
       // pawn on each file is considered a true passed pawn.
       if (passed && !doubled)
-          set_bit(&(pi->passedPawns[Us]), s);
+          pi->passedPawns[Us] |= s;
 
       // Score this pawn
       if (isolated)
@@ -223,7 +222,7 @@ Score PawnInfo::updateShelter(const Position& pos, Square ksq) {
 
   if (relative_rank(Us, ksq) <= RANK_4)
   {
-      pawns = pos.pieces(PAWN, Us) & this_and_neighboring_files_bb(ksq);
+      pawns = pos.pieces(PAWN, Us) & this_and_adjacent_files_bb(file_of(ksq));
       r = ksq & (7 << 3);
       for (int i = 0; i < 3; i++)
       {