restructing

1 files changed, 0 insertions, 164 deletions

diff --git a/src/search/pawn_moves.c b/src/search/pawn_moves.c
deleted file mode 100644
index 6b85cc2..0000000
--- a/src/search/pawn_moves.c
+++ /dev/null
@@ -1,164 +0,0 @@
-#include "../search.h"
-
-bitboard_t get_white_pawn_forwardmoves(moves_t* moves, position_t position) {
-  bitboard_t enemy_bitboard = blacks(position);
-  bitboard_t friendly_pieces =
-    position.bitboards[WHITE_KING] |
-    position.bitboards[WHITE_QUEEN] |
-    position.bitboards[WHITE_ROOK] |
-    position.bitboards[WHITE_BISHOP] |
-    position.bitboards[WHITE_KNIGHT] |
-    position.bitboards[WHITE_PAWN];
-  bitboard_t friendly_pawns = position.bitboards[WHITE_PAWN];
-  bitboard_t y = friendly_pieces | enemy_bitboard;
-  bitboard_t x = ~((friendly_pawns << 8) & y) & (friendly_pawns << 8);
-  bitboard_t first_move_x = x & BITMASK_RANK_3;
-
-  first_move_x |= (first_move_x << 8) & (~y);
-  x |= first_move_x;
-
-  return x;
-}
-bitboard_t get_black_pawn_forwardmoves(moves_t* moves, position_t position) {
-  bitboard_t enemy_bitboard = whites(position);
-  bitboard_t friendly_pieces =
-    position.bitboards[BLACK_KING] |
-    position.bitboards[BLACK_QUEEN] |
-    position.bitboards[BLACK_ROOK] |
-    position.bitboards[BLACK_BISHOP] |
-    position.bitboards[BLACK_KNIGHT] |
-    position.bitboards[BLACK_PAWN];
-  bitboard_t friendly_pawns = position.bitboards[BLACK_PAWN];
-  bitboard_t y = friendly_pieces | enemy_bitboard;
-  bitboard_t x = ~((friendly_pawns >> 8) & y) & (friendly_pawns >> 8);
-  bitboard_t first_move_x = x & BITMASK_RANK_6;
-
-  first_move_x |= (first_move_x >> 8) & (~y);
-  x |= first_move_x;
-
-  return x;
-}
-
-void get_pawn_moves(moves_t* moves, position_t position) {
-  assert_valid_position(position);
-
-  bitboard_t forward_moves;
-  bitboard_t friendly_pawns;
-  bitboard_t enemy_bitboard;
-  if (position.turn == WHITE_TURN) {
-    forward_moves = get_white_pawn_forwardmoves(moves, position);
-    friendly_pawns = position.bitboards[WHITE_PAWN];
-    enemy_bitboard = blacks(position);
-  } else {
-    forward_moves = get_black_pawn_forwardmoves(moves, position);
-    friendly_pawns = position.bitboards[BLACK_PAWN];
-    enemy_bitboard = whites(position);
-  }
-
-  bitboard_t file_masks[8] = {
-    BITMASK_FILE_A,
-    BITMASK_FILE_B,
-    BITMASK_FILE_C,
-    BITMASK_FILE_D,
-    BITMASK_FILE_E,
-    BITMASK_FILE_F,
-    BITMASK_FILE_G,
-    BITMASK_FILE_H,
-  };
-
-  for (int i = 0; i < 8; i++) {
-    bitboard_t item = file_masks[i] & forward_moves;
-    bitboard_t pawns = file_masks[i] & friendly_pawns;
-
-    int from = __builtin_ctzll(pawns);
-    pawns &= (pawns - 1);
-    int next_from = __builtin_ctzll(pawns);
-    if (pawns == 0) next_from = 64; // to work around UB
-    
-    while (item) {
-      int to = __builtin_ctzll(item);
-      if (to > next_from) {
-        from = next_from;
-        pawns &= (pawns - 1);
-        next_from = __builtin_ctzll(pawns);
-        if (pawns == 0) next_from = 64;
-      }
-      item &= (item - 1);
-      add_move(moves, from, to);
-    }
-  }
-
-  if (position.passantable_file != 0) {
-    bitboard_t PASSANT_RANK;
-    int rank_shift;
-    int from_shift;
-    if (position.turn == WHITE_TURN) {
-      PASSANT_RANK = BITMASK_RANK_5;
-      rank_shift = 40;
-      from_shift = -9;
-    } else {
-      PASSANT_RANK = BITMASK_RANK_4;
-      from_shift = 7;
-      rank_shift = 16;
-    }
-
-    int left = 0, right = 0;
-    if (position.passantable_file > 1) left = position.passantable_file - 1;
-    if (position.passantable_file < 8) right = position.passantable_file + 1;
-    if (left != 0) {
-      bitboard_t MASK = file_masks[left - 1] & friendly_pawns & PASSANT_RANK;
-      if (MASK != 0) {
-        add_move(
-          moves,
-          left + rank_shift + from_shift,
-          position.passantable_file + rank_shift - 1
-        );
-      }
-    }
-    if (right != 0) {
-      bitboard_t MASK = file_masks[right - 1] & friendly_pawns & PASSANT_RANK;
-      if (MASK != 0) {
-        add_move(
-          moves,
-          right + rank_shift + from_shift,
-          position.passantable_file + rank_shift - 1
-        );
-      }
-    }
-  }
-
-
-  bitboard_t ATTACK_MASK;
-  int shift;
-  if (position.turn == WHITE_TURN) {
-    shift = 0;
-  } else {
-    shift = -16;
-  }
-  for (int i = 0; i < 8; i++) {
-    if (i == 0) ATTACK_MASK = 512;
-    else if (i == 7) ATTACK_MASK = 128;
-    else {
-      ATTACK_MASK = 640;
-    }
-    bitboard_t pawns = file_masks[i] & friendly_pawns;
-    while (pawns) {
-      int from = __builtin_ctzll(pawns);
-      pawns &= pawns - 1;
-
-      bitboard_t MASK; 
-      if (from + shift > 0) {
-        MASK = ATTACK_MASK << (from + shift);
-      } else {
-        MASK = ATTACK_MASK >> -(from + shift);
-      }
-
-      MASK &= enemy_bitboard;
-      while (MASK) {
-        int to = __builtin_ctzll(MASK);
-        MASK &= MASK - 1;
-        add_move(moves, from, to);
-      }
-    }
-  }
-}