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Simplify squares_delta()
And rename in ray_direction() Patch from UncombedCoconut. No functional change. Signed-off-by: Marco Costalba <mcostalba@gmail.com>
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2 changed files with 8 additions and 17 deletions
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@ -248,7 +248,7 @@ namespace {
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void init_attacks();
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void init_between_bitboards();
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void init_pseudo_attacks();
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SquareDelta squares_delta(Square orig, Square dest);
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SquareDelta ray_direction(Square orig, Square dest);
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Bitboard index_to_bitboard(int index, Bitboard mask);
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Bitboard sliding_attacks(int sq, Bitboard block, int dirs, int deltas[][2],
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int fmin, int fmax, int rmin, int rmax);
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@ -454,23 +454,14 @@ namespace {
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return result;
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}
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SquareDelta squares_delta(Square orig, Square dest) {
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SquareDelta ray_direction(Square orig, Square dest) {
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const SquareDelta deltas[] = { DELTA_N, DELTA_NE, DELTA_E, DELTA_SE,
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DELTA_S, DELTA_SW, DELTA_W, DELTA_NW };
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int df = file_distance(orig, dest);
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int dr = rank_distance(orig, dest);
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for (int idx = 0; idx < 8; idx++)
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{
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Square s = orig + deltas[idx];
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if (orig != dest && (!df || !dr || df == dr))
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return SquareDelta(dest - orig) / Max(df, dr);
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while (square_is_ok(s) && square_distance(s, s - deltas[idx]) == 1)
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{
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if (s == dest)
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return deltas[idx];
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s += deltas[idx];
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}
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}
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return DELTA_NONE;
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}
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@ -483,7 +474,7 @@ namespace {
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for (s2 = SQ_A1; s2 <= SQ_H8; s2++)
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{
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BetweenBB[s1][s2] = EmptyBoardBB;
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d = squares_delta(s1, s2);
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d = ray_direction(s1, s2);
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if (d != DELTA_NONE)
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for (s3 = s1 + d; s3 != s2; s3 += d)
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@ -562,7 +562,7 @@ namespace {
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if (Type == CHECK)
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{
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// Condider only pawn moves which give direct checks
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// Consider only pawn moves which give direct checks
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b1 &= pos.attacks_from<PAWN>(ksq, Them);
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b2 &= pos.attacks_from<PAWN>(ksq, Them);
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