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Retire SignedDirectionTable[] and RayBB[]

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Function ray_bb() was used just in one endgame where can
be used squares_in_front_of() instead.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2010-12-26 11:58:48 +01:00
parent 6080fecf9c
commit f08a6eed0d
5 changed files with 35 additions and 82 deletions
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44
src/bitboard.cpp
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@@ -225,7 +225,6 @@ Bitboard SetMaskBB[65];
Bitboard ClearMaskBB[65];
Bitboard StepAttackBB[16][64];
Bitboard RayBB[64][8];
Bitboard BetweenBB[64][64];
Bitboard SquaresInFrontMask[2][64];
@@ -246,7 +245,6 @@ uint8_t BitCount8Bit[256];
namespace {
void init_masks();
void init_ray_bitboards();
void init_attacks();
void init_between_bitboards();
void init_pseudo_attacks();
@@ -288,7 +286,6 @@ void init_bitboards() {
int bishopDeltas[4][2] = {{1,1},{-1,1},{1,-1},{-1,-1}};
init_masks();
init_ray_bitboards();
init_attacks();
init_between_bitboards();
init_sliding_attacks(RAttacks, RAttackIndex, RMask, RShift, RMult, rookDeltas);
@@ -406,21 +403,6 @@ namespace {
BitCount8Bit[b] = (uint8_t)count_1s<CNT32>(b);
}
int remove_bit_8(int i) { return ((i & ~15) >> 1) | (i & 7); }
void init_ray_bitboards() {
int d[8] = {1, -1, 16, -16, 17, -17, 15, -15};
for (int i = 0; i < 128; i = (i + 9) & ~8)
for (int j = 0; j < 8; j++)
{
RayBB[remove_bit_8(i)][j] = EmptyBoardBB;
for (int k = i + d[j]; (k & 0x88) == 0; k += d[j])
set_bit(&(RayBB[remove_bit_8(i)][j]), Square(remove_bit_8(k)));
}
}
void init_attacks() {
const int step[16][8] = {
@@ -473,20 +455,26 @@ namespace {
void init_between_bitboards() {
const SquareDelta step[8] = { DELTA_E, DELTA_W, DELTA_N, DELTA_S,
DELTA_NE, DELTA_SW, DELTA_NW, DELTA_SE };
const SquareDelta directionToDelta[] = {
DELTA_E, DELTA_N, DELTA_NE, DELTA_NW, DELTA_W, DELTA_S, DELTA_SW, DELTA_SE
};
for (Square s1 = SQ_A1; s1 <= SQ_H8; s1++)
for (Square s2 = SQ_A1; s2 <= SQ_H8; s2++)
Square s1, s2, s3;
Direction d;
for (s1 = SQ_A1; s1 <= SQ_H8; s1++)
for (s2 = SQ_A1; s2 <= SQ_H8; s2++)
{
BetweenBB[s1][s2] = EmptyBoardBB;
SignedDirection d = SignedDirection(SignedDirectionTable[s1][s2]);
d = direction_between_squares(s1, s2);
if (d != SIGNED_DIR_NONE)
{
for (Square s3 = s1 + step[d]; s3 != s2; s3 += step[d])
set_bit(&(BetweenBB[s1][s2]), s3);
}
if (d == DIR_NONE)
continue;
SquareDelta sd = directionToDelta[s2 > s1 ? d : d + 4];
for (s3 = s1 + sd; s3 != s2; s3 += sd)
set_bit(&(BetweenBB[s1][s2]), s3);
}
}