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Last touches to movegen.cpp

Browse source 
The full movegen patch series shows a speed up of almost
6% (!) on perft, and code is much more readable too.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2012-01-06 12:37:33 +01:00
parent 9c8c4ff46f
commit 83f3ea7ab4
1 changed files with 28 additions and 44 deletions
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70
src/movegen.cpp
View file

@ -20,17 +20,16 @@
#include <algorithm>
#include <cassert>
#include "bitcount.h"
#include "movegen.h"
#include "position.h"
/// Simple macro to wrap a very common while loop, no facny, no flexibility,
/// hardcoded names 'mlist' and 'from'.
#define SERIALIZE_MOVES(b) while (b) (*mlist++).move = make_move(from, pop_1st_bit(&b))
#define SERIALIZE(b) while (b) (*mlist++).move = make_move(from, pop_1st_bit(&b))
/// Version used for pawns, where the 'from' square is given as a delta from the 'to' square
#define SERIALIZE_MOVES_D(b, d) while (b) { to = pop_1st_bit(&b); (*mlist++).move = make_move(to + (d), to); }
#define SERIALIZE_PAWNS(b, d) while (b) { Square to = pop_1st_bit(&b); \
(*mlist++).move = make_move(to + (d), to); }
namespace {
enum CastlingSide { KING_SIDE, QUEEN_SIDE };
@ -100,11 +99,9 @@ namespace {
const Bitboard TFileABB = ( Delta == DELTA_NE
|| Delta == DELTA_SE ? FileABB : FileHBB);
Bitboard b;
Square to;
b = move_pawns<Delta>(pawns) & target & ~TFileABB;
SERIALIZE_MOVES_D(b, -Delta);
Bitboard b = move_pawns<Delta>(pawns) & target & ~TFileABB;
SERIALIZE_PAWNS(b, -Delta);
return mlist;
}
@ -114,17 +111,15 @@ namespace {
const Bitboard TFileABB = ( Delta == DELTA_NE
|| Delta == DELTA_SE ? FileABB : FileHBB);
Bitboard b;
Square to;
b = move_pawns<Delta>(pawnsOn7) & target;
Bitboard b = move_pawns<Delta>(pawnsOn7) & target;
if (Delta != DELTA_N && Delta != DELTA_S)
b &= ~TFileABB;
while (b)
{
to = pop_1st_bit(&b);
Square to = pop_1st_bit(&b);
if (Type == MV_CAPTURE || Type == MV_EVASION || Type == MV_NON_EVASION)
(*mlist++).move = make_promotion(to - Delta, to, QUEEN);
@ -138,8 +133,7 @@ namespace {
// Knight-promotion is the only one that can give a check (direct or
// discovered) not already included in the queen-promotion.
if ( Type == MV_NON_CAPTURE_CHECK
&& bit_is_set(StepAttacksBB[W_KNIGHT][to], ksq))
if (Type == MV_NON_CAPTURE_CHECK && bit_is_set(StepAttacksBB[W_KNIGHT][to], ksq))
(*mlist++).move = make_promotion(to - Delta, to, KNIGHT);
else
(void)ksq; // Silence a warning under MSVC
@ -160,12 +154,10 @@ namespace {
const Square RIGHT = (Us == WHITE ? DELTA_NE : DELTA_SW);
const Square LEFT = (Us == WHITE ? DELTA_NW : DELTA_SE);
Square to;
Bitboard b1, b2, dc1, dc2, emptySquares;
Bitboard pawns = pos.pieces(PAWN, Us);
Bitboard pawnsOn7 = pawns & TRank7BB;
Bitboard pawnsNotOn7 = pawns & ~TRank7BB;
Bitboard pawnsOn7 = pos.pieces(PAWN, Us) & TRank7BB;
Bitboard pawnsNotOn7 = pos.pieces(PAWN, Us) & ~TRank7BB;
Bitboard enemies = (Type == MV_EVASION ? pos.pieces(Them) & target:
Type == MV_CAPTURE ? target : pos.pieces(Them));
@ -204,8 +196,8 @@ namespace {
}
}
SERIALIZE_MOVES_D(b1, -UP);
SERIALIZE_MOVES_D(b2, -UP -UP);
SERIALIZE_PAWNS(b1, -UP);
SERIALIZE_PAWNS(b2, -UP -UP);
}
// Promotions and underpromotions
@ -276,7 +268,7 @@ namespace {
continue;
b = pos.attacks_from<Pt>(from) & checkSqs;
SERIALIZE_MOVES(b);
SERIALIZE(b);
} while ((from = *pl++) != SQ_NONE);
@ -287,8 +279,8 @@ namespace {
template<>
FORCE_INLINE MoveStack* generate_direct_checks<PAWN>(const Position& p, MoveStack* m, Color us, Bitboard dc, Square ksq) {
return (us == WHITE ? generate_pawn_moves<WHITE, MV_NON_CAPTURE_CHECK>(p, m, dc, ksq)
: generate_pawn_moves<BLACK, MV_NON_CAPTURE_CHECK>(p, m, dc, ksq));
return us == WHITE ? generate_pawn_moves<WHITE, MV_NON_CAPTURE_CHECK>(p, m, dc, ksq)
: generate_pawn_moves<BLACK, MV_NON_CAPTURE_CHECK>(p, m, dc, ksq);
}
@ -296,8 +288,8 @@ namespace {
FORCE_INLINE MoveStack* generate_piece_moves(const Position& p, MoveStack* m, Color us, Bitboard t) {
assert(Pt == PAWN);
return (us == WHITE ? generate_pawn_moves<WHITE, Type>(p, m, t, SQ_NONE)
: generate_pawn_moves<BLACK, Type>(p, m, t, SQ_NONE));
return us == WHITE ? generate_pawn_moves<WHITE, Type>(p, m, t, SQ_NONE)
: generate_pawn_moves<BLACK, Type>(p, m, t, SQ_NONE);
}
@ -313,7 +305,7 @@ namespace {
do {
from = *pl;
b = pos.attacks_from<Pt>(from) & target;
SERIALIZE_MOVES(b);
SERIALIZE(b);
} while (*++pl != SQ_NONE);
}
return mlist;
@ -323,11 +315,9 @@ namespace {
template<>
FORCE_INLINE MoveStack* generate_piece_moves<KING>(const Position& pos, MoveStack* mlist, Color us, Bitboard target) {
Bitboard b;
Square from = pos.king_square(us);
b = pos.attacks_from<KING>(from) & target;
SERIALIZE_MOVES(b);
Bitboard b = pos.attacks_from<KING>(from) & target;
SERIALIZE(b);
return mlist;
}
@ -398,7 +388,6 @@ MoveStack* generate<MV_NON_CAPTURE_CHECK>(const Position& pos, MoveStack* mlist)
assert(pos.piece_on(ksq) == make_piece(flip(us), KING));
// Discovered non-capture checks
b = dc = pos.discovered_check_candidates();
while (b)
@ -414,10 +403,9 @@ MoveStack* generate<MV_NON_CAPTURE_CHECK>(const Position& pos, MoveStack* mlist)
if (pt == KING)
b &= ~QueenPseudoAttacks[ksq];
SERIALIZE_MOVES(b);
SERIALIZE(b);
}
// Direct non-capture checks
mlist = generate_direct_checks<PAWN>(pos, mlist, us, dc, ksq);
mlist = generate_direct_checks<KNIGHT>(pos, mlist, us, dc, ksq);
mlist = generate_direct_checks<BISHOP>(pos, mlist, us, dc, ksq);
@ -444,9 +432,8 @@ MoveStack* generate<MV_EVASION>(const Position& pos, MoveStack* mlist) {
assert(pos.piece_on(ksq) == make_piece(us, KING));
assert(checkers);
// Find squares attacked by slider checkers, we will remove
// them from the king evasions set so to early skip known
// illegal moves and avoid an useless legality check later.
// Find squares attacked by slider checkers, we will remove them from the king
// evasions set so to skip known illegal moves and avoid to do legality check later.
b = checkers;
do
{
@ -479,14 +466,13 @@ MoveStack* generate<MV_EVASION>(const Position& pos, MoveStack* mlist) {
// Generate evasions for king, capture and non capture moves
b = pos.attacks_from<KING>(ksq) & ~pos.pieces(us) & ~sliderAttacks;
from = ksq;
SERIALIZE_MOVES(b);
SERIALIZE(b);
// Generate evasions for other pieces only if not double check
// Generate evasions for other pieces only if not under a double check
if (checkersCnt > 1)
return mlist;
// Find squares where a blocking evasion or a capture of the
// checker piece is possible.
// Target for blocking evasions or captures of the checking piece
target = squares_between(checksq, ksq) | checkers;
mlist = generate_piece_moves<PAWN, MV_EVASION>(pos, mlist, us, target);
@ -497,7 +483,7 @@ MoveStack* generate<MV_EVASION>(const Position& pos, MoveStack* mlist) {
}
/// generate<MV_LEGAL> generates all legal moves in the current position
/// generate<MV_LEGAL> generates all the legal moves in the given position
template<>
MoveStack* generate<MV_LEGAL>(const Position& pos, MoveStack* mlist) {
@ -507,8 +493,6 @@ MoveStack* generate<MV_LEGAL>(const Position& pos, MoveStack* mlist) {
last = pos.in_check() ? generate<MV_EVASION>(pos, mlist)
: generate<MV_NON_EVASION>(pos, mlist);
// Remove illegal moves from the list
while (cur != last)
if (!pos.pl_move_is_legal(cur->move, pinned))
cur->move = (--last)->move;