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Rename first_1 / last_1 in lsb / msb

Browse source 
It seems more accurate: lsb is clear while 'first
bit' depends from where you look at the bitboard.

And fix compile in case of 64 bits platforms that
do not use BSFQ intrinsics.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2012-07-08 08:30:37 +01:00
parent 67d91dfd50
commit 6b5322ce00
12 changed files with 66 additions and 70 deletions
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4
src/bitbase.cpp
View file

@ -196,8 +196,8 @@ namespace {
while (b)
{
r |= Us == WHITE ? db[index(pop_1st_bit(&b), bksq, psq, BLACK)]
: db[index(wksq, pop_1st_bit(&b), psq, WHITE)];
r |= Us == WHITE ? db[index(pop_lsb(&b), bksq, psq, BLACK)]
: db[index(wksq, pop_lsb(&b), psq, WHITE)];
if (Us == WHITE && (r & WIN))
return WIN;

29
src/bitboard.cpp
View file

@ -69,40 +69,35 @@ namespace {
Bitboard masks[], unsigned shifts[], Square deltas[], Fn index);
}
/// first_1() finds the least significant nonzero bit in a nonzero bitboard.
/// pop_1st_bit() finds and clears the least significant nonzero bit in a
/// nonzero bitboard.
/// lsb()/msb() finds the least/most significant bit in a nonzero bitboard.
/// pop_lsb() finds and clears the least significant bit in a nonzero bitboard.
#if defined(IS_64BIT) && !defined(USE_BSFQ)
#if !defined(USE_BSFQ)
Square first_1(Bitboard b) {
return Square(BSFTable[((b & -b) * 0x218A392CD3D5DBFULL) >> 58]);
}
Square lsb(Bitboard b) {
Square pop_1st_bit(Bitboard* b) {
Bitboard bb = *b;
*b &= (*b - 1);
return Square(BSFTable[((bb & -bb) * 0x218A392CD3D5DBFULL) >> 58]);
}
if (Is64Bit)
return Square(BSFTable[((b & -b) * 0x218A392CD3D5DBFULL) >> 58]);
#elif !defined(USE_BSFQ)
Square first_1(Bitboard b) {
b ^= (b - 1);
uint32_t fold = unsigned(b) ^ unsigned(b >> 32);
return Square(BSFTable[(fold * 0x783A9B23) >> 26]);
}
Square pop_1st_bit(Bitboard* b) {
Square pop_lsb(Bitboard* b) {
Bitboard bb = *b;
*b = bb & (bb - 1);
if (Is64Bit)
return Square(BSFTable[((bb & -bb) * 0x218A392CD3D5DBFULL) >> 58]);
bb ^= (bb - 1);
uint32_t fold = unsigned(bb) ^ unsigned(bb >> 32);
return Square(BSFTable[(fold * 0x783A9B23) >> 26]);
}
Square last_1(Bitboard b) {
Square msb(Bitboard b) {
unsigned b32;
int result = 0;

45
src/bitboard.h
View file

@ -221,51 +221,52 @@ inline Bitboard attacks_bb(Square s, Bitboard occ) {
}
/// first_1() finds the least significant nonzero bit in a nonzero bitboard.
/// pop_1st_bit() finds and clears the least significant nonzero bit in a
/// nonzero bitboard.
/// lsb()/msb() finds the least/most significant bit in a nonzero bitboard.
/// pop_lsb() finds and clears the least significant bit in a nonzero bitboard.
#if defined(USE_BSFQ)
#if defined(_MSC_VER) && !defined(__INTEL_COMPILER)
# if defined(_MSC_VER) && !defined(__INTEL_COMPILER)
FORCE_INLINE Square first_1(Bitboard b) {
FORCE_INLINE Square lsb(Bitboard b) {
unsigned long index;
_BitScanForward64(&index, b);
return (Square) index;
}
FORCE_INLINE Square last_1(Bitboard b) {
FORCE_INLINE Square msb(Bitboard b) {
unsigned long index;
_BitScanReverse64(&index, b);
return (Square) index;
}
#else
FORCE_INLINE Square first_1(Bitboard b) { // Assembly code by Heinz van Saanen
Bitboard dummy;
__asm__("bsfq %1, %0": "=r"(dummy): "rm"(b) );
return (Square) dummy;
# else
FORCE_INLINE Square lsb(Bitboard b) { // Assembly code by Heinz van Saanen
Bitboard index;
__asm__("bsfq %1, %0": "=r"(index): "rm"(b) );
return (Square) index;
}
FORCE_INLINE Square last_1(Bitboard b) {
Bitboard dummy;
__asm__("bsrq %1, %0": "=r"(dummy): "rm"(b) );
return (Square) dummy;
FORCE_INLINE Square msb(Bitboard b) {
Bitboard index;
__asm__("bsrq %1, %0": "=r"(index): "rm"(b) );
return (Square) index;
}
#endif
FORCE_INLINE Square pop_1st_bit(Bitboard* b) {
const Square s = first_1(*b);
*b &= ~(1ULL<<s);
# endif
FORCE_INLINE Square pop_lsb(Bitboard* b) {
const Square s = lsb(*b);
*b &= ~(1ULL << s);
return s;
}
#else // if !defined(USE_BSFQ)
extern Square first_1(Bitboard b);
extern Square last_1(Bitboard b);
extern Square pop_1st_bit(Bitboard* b);
extern Square msb(Bitboard b);
extern Square lsb(Bitboard b);
extern Square pop_lsb(Bitboard* b);
#endif

2
src/bitcount.h
View file

@ -90,7 +90,7 @@ inline int popcount<CNT_HW_POPCNT>(Bitboard b) {
#if !defined(USE_POPCNT)
assert(false);
return int(b != 0); // Avoid 'b not used' warning
return b != 0; // Avoid 'b not used' warning
#elif defined(_MSC_VER) && defined(__INTEL_COMPILER)

4
src/book.cpp
View file

@ -316,7 +316,7 @@ namespace {
{
// Piece offset is at 64 * polyPiece where polyPiece is defined as:
// BP = 0, WP = 1, BN = 2, WN = 3, ... BK = 10, WK = 11
Square s = pop_1st_bit(&b);
Square s = pop_lsb(&b);
Piece p = pos.piece_on(s);
int polyPiece = 2 * (type_of(p) - 1) + (color_of(p) == WHITE);
key ^= ZobPiece[64 * polyPiece + s];
@ -325,7 +325,7 @@ namespace {
b = pos.can_castle(ALL_CASTLES);
while (b)
key ^= ZobCastle[pop_1st_bit(&b)];
key ^= ZobCastle[pop_lsb(&b)];
if (pos.ep_square() != SQ_NONE)
key ^= ZobEnPassant[file_of(pos.ep_square())];

16
src/evaluate.cpp
View file

@ -582,7 +582,7 @@ Value do_evaluate(const Position& pos, Value& margin) {
assert(b);
if (!more_than_one(b) && (b & pos.pieces(Them)))
score += ThreatBonus[Piece][type_of(pos.piece_on(first_1(b)))];
score += ThreatBonus[Piece][type_of(pos.piece_on(lsb(b)))];
}
// Decrease score if we are attacked by an enemy pawn. Remaining part
@ -870,7 +870,7 @@ Value do_evaluate(const Position& pos, Value& margin) {
return SCORE_ZERO;
do {
Square s = pop_1st_bit(&b);
Square s = pop_lsb(&b);
assert(pos.pawn_is_passed(Us, s));
@ -976,7 +976,7 @@ Value do_evaluate(const Position& pos, Value& margin) {
while (b)
{
s = pop_1st_bit(&b);
s = pop_lsb(&b);
queeningSquare = relative_square(c, file_of(s) | RANK_8);
queeningPath = forward_bb(c, s);
@ -1017,7 +1017,7 @@ Value do_evaluate(const Position& pos, Value& margin) {
while (b)
{
s = pop_1st_bit(&b);
s = pop_lsb(&b);
// Compute plies from queening
queeningSquare = relative_square(loserSide, file_of(s) | RANK_8);
@ -1039,7 +1039,7 @@ Value do_evaluate(const Position& pos, Value& margin) {
while (b)
{
s = pop_1st_bit(&b);
s = pop_lsb(&b);
sacptg = blockersCount = 0;
minKingDist = kingptg = 256;
@ -1058,7 +1058,7 @@ Value do_evaluate(const Position& pos, Value& margin) {
// How many plies does it take to remove all the blocking pawns?
while (blockers)
{
blockSq = pop_1st_bit(&blockers);
blockSq = pop_lsb(&blockers);
movesToGo = 256;
// Check pawns that can give support to overcome obstacle, for instance
@ -1069,7 +1069,7 @@ Value do_evaluate(const Position& pos, Value& margin) {
while (b2) // This while-loop could be replaced with LSB/MSB (depending on color)
{
d = square_distance(blockSq, pop_1st_bit(&b2)) - 2;
d = square_distance(blockSq, pop_lsb(&b2)) - 2;
movesToGo = std::min(movesToGo, d);
}
}
@ -1079,7 +1079,7 @@ Value do_evaluate(const Position& pos, Value& margin) {
while (b2) // This while-loop could be replaced with LSB/MSB (depending on color)
{
d = square_distance(blockSq, pop_1st_bit(&b2)) - 2;
d = square_distance(blockSq, pop_lsb(&b2)) - 2;
movesToGo = std::min(movesToGo, d);
}

12
src/movegen.cpp
View file

@ -25,10 +25,10 @@
/// Simple macro to wrap a very common while loop, no facny, no flexibility,
/// hardcoded names 'mlist' and 'from'.
#define SERIALIZE(b) while (b) (*mlist++).move = make_move(from, pop_1st_bit(&b))
#define SERIALIZE(b) while (b) (*mlist++).move = make_move(from, pop_lsb(&b))
/// Version used for pawns, where the 'from' square is given as a delta from the 'to' square
#define SERIALIZE_PAWNS(b, d) while (b) { Square to = pop_1st_bit(&b); \
#define SERIALIZE_PAWNS(b, d) while (b) { Square to = pop_lsb(&b); \
(*mlist++).move = make_move(to - (d), to); }
namespace {
@ -87,7 +87,7 @@ namespace {
while (b)
{
Square to = pop_1st_bit(&b);
Square to = pop_lsb(&b);
if (Type == CAPTURES || Type == EVASIONS || Type == NON_EVASIONS)
(*mlist++).move = make<PROMOTION>(to - Delta, to, QUEEN);
@ -207,7 +207,7 @@ namespace {
assert(b1);
while (b1)
(*mlist++).move = make<ENPASSANT>(pop_1st_bit(&b1), pos.ep_square());
(*mlist++).move = make<ENPASSANT>(pop_lsb(&b1), pos.ep_square());
}
}
@ -343,7 +343,7 @@ MoveStack* generate<QUIET_CHECKS>(const Position& pos, MoveStack* mlist) {
while (dc)
{
Square from = pop_1st_bit(&dc);
Square from = pop_lsb(&dc);
PieceType pt = type_of(pos.piece_on(from));
if (pt == PAWN)
@ -398,7 +398,7 @@ MoveStack* generate<EVASIONS>(const Position& pos, MoveStack* mlist) {
do
{
checkersCnt++;
checksq = pop_1st_bit(&b);
checksq = pop_lsb(&b);
assert(color_of(pos.piece_on(checksq)) == ~us);

2
src/notation.cpp
View file

@ -108,7 +108,7 @@ const string move_to_san(Position& pos, Move m) {
while (attackers)
{
Square sq = pop_1st_bit(&attackers);
Square sq = pop_lsb(&attackers);
// Pinned pieces are not included in the possible sub-set
if (!pos.pl_move_is_legal(make_move(sq, to), pos.pinned_pieces()))

4
src/pawns.cpp
View file

@ -240,12 +240,12 @@ Value PawnEntry::shelter_storm(const Position& pos, Square ksq) {
{
// Shelter penalty is higher for the pawn in front of the king
b = ourPawns & FileBB[f];
rkUs = b ? rank_of(Us == WHITE ? first_1(b) : ~last_1(b)) : RANK_1;
rkUs = b ? rank_of(Us == WHITE ? lsb(b) : ~msb(b)) : RANK_1;
safety -= ShelterWeakness[f != kf][rkUs];
// Storm danger is smaller if enemy pawn is blocked
b = theirPawns & FileBB[f];
rkThem = b ? rank_of(Us == WHITE ? first_1(b) : ~last_1(b)) : RANK_1;
rkThem = b ? rank_of(Us == WHITE ? lsb(b) : ~msb(b)) : RANK_1;
safety -= StormDanger[rkThem == rkUs + 1][rkThem];
}

12
src/position.cpp
View file

@ -359,7 +359,7 @@ Bitboard Position::hidden_checkers() const {
while (pinners)
{
b = between_bb(ksq, pop_1st_bit(&pinners)) & pieces();
b = between_bb(ksq, pop_lsb(&pinners)) & pieces();
if (b && !more_than_one(b) && (b & pieces(sideToMove)))
result |= b;
@ -597,7 +597,7 @@ bool Position::is_pseudo_legal(const Move m) const {
if (type_of(pc) != KING)
{
Bitboard b = checkers();
Square checksq = pop_1st_bit(&b);
Square checksq = pop_lsb(&b);
if (b) // double check ? In this case a king move is required
return false;
@ -1323,7 +1323,7 @@ Key Position::compute_key() const {
for (Bitboard b = pieces(); b; )
{
Square s = pop_1st_bit(&b);
Square s = pop_lsb(&b);
k ^= zobrist[color_of(piece_on(s))][type_of(piece_on(s))][s];
}
@ -1349,7 +1349,7 @@ Key Position::compute_pawn_key() const {
for (Bitboard b = pieces(PAWN); b; )
{
Square s = pop_1st_bit(&b);
Square s = pop_lsb(&b);
k ^= zobrist[color_of(piece_on(s))][PAWN][s];
}
@ -1386,7 +1386,7 @@ Score Position::compute_psq_score() const {
for (Bitboard b = pieces(); b; )
{
Square s = pop_1st_bit(&b);
Square s = pop_lsb(&b);
score += pieceSquareTable[piece_on(s)][s];
}
@ -1477,7 +1477,7 @@ void Position::init() {
Bitboard b = cr;
while (b)
{
Key k = zobCastle[1ULL << pop_1st_bit(&b)];
Key k = zobCastle[1ULL << pop_lsb(&b)];
zobCastle[cr] ^= k ? k : rk.rand<Key>();
}
}

2
src/search.cpp
View file

@ -1354,7 +1354,7 @@ split_point_start: // At split points actual search starts from here
while (b)
{
// Note that here we generate illegal "double move"!
if (futilityBase + PieceValueEndgame[pos.piece_on(pop_1st_bit(&b))] >= beta)
if (futilityBase + PieceValueEndgame[pos.piece_on(pop_lsb(&b))] >= beta)
return true;
}

4
src/tt.cpp
View file

@ -44,7 +44,7 @@ TranspositionTable::~TranspositionTable() {
void TranspositionTable::set_size(size_t mbSize) {
size_t newSize = 1ULL << last_1((mbSize << 20) / sizeof(TTCluster));
size_t newSize = 1ULL << msb((mbSize << 20) / sizeof(TTCluster));
if (newSize == size)
return;
@ -60,7 +60,7 @@ void TranspositionTable::set_size(size_t mbSize) {
exit(EXIT_FAILURE);
}
clear(); // operator new is not guaranteed to initialize memory to zero
clear(); // Operator new is not guaranteed to initialize memory to zero
}