add a struct_group for move_do() irreversible changes

.gitignore

@@ -17,4 +17,5 @@ vgcore.*
 /tmp/
 /notused/
 valgrind.out
+gmon.out
 compile_commands.json

src/move-gen.c

@@ -79,7 +79,7 @@ bool pseudo_is_legal(const pos_t *pos, const move_t move)
      * 5th relative rank. To do so, we create an occupation bb without
      * the 2 pawns.
      */
-    if (IS_CAPTURE(move) && PIECE(pos->board[to]) == EMPTY) {
+    if (is_capture(move) && PIECE(pos->board[to]) == EMPTY) {
          /* from rank bitboard */
         bitboard_t rank5 = bb_sqrank[from];
         /* enemy rooks/queens on from rank */

src/move.c

@@ -109,7 +109,7 @@ char *move_str(char *dst, const move_t move, __unused const int flags)
     int len;
     sprintf(dst, "%s%s%n", sq_to_string(from), sq_to_string(to), &len);
 
-    if (IS_PROMOTION(move)) {
+    if (is_promotion(move)) {
         piece_t promoted = move_promoted(move);
         sprintf(dst + len, "%s", piece_to_low(promoted));
     }

src/move.h

@@ -23,14 +23,14 @@
  * 1 0    5 3    8 7 5 4 2 1    6 5    0
  * S UUUUUUU FFFFFF ccc ppp tttttt ffffff
  *
- * bits    len  off  range          type          mask       get   desc
- * ffffff    6    0    0-5      square_t           077       &63   from
- * tttttt    6    6   6-11      square_t         07700  (>>6)&63   to
- * ppp       3   12  12-14  piece_type_t        070000  (>>12)&7   promoted
- * ccc       3   15  15-17  piece_type_t       0700000  (>>15)&7   captured
- * FFFFFF    6   18  18-23  move_flags_t     077000000 (>>18)&63   N/A  flags
- * UUUUUUU   7   24  24-30        unused  017700000000             future usage
- * S         1   31  31-31             -  020000000000             sign
+ * bits    len off range         type         mask        get  desc
+ * ffffff    6   0   0-5     square_t          077        &077 from
+ * tttttt    6   6  6-11     square_t        07700 (>>6)  &077 to
+ * ppp       3  12 12-14 piece_type_t       070000 (>>12) &07  promoted
+ * ccc       3  15 15-17 piece_type_t      0700000 (>>15) &07  captured
+ * FFFFFF    6  18 18-23 move_flags_t    077000000 (>>18) &077 N/A  flags
+ * UUUUUUU   7  24 24-30       unused 017700000000             future usage
+ * S         1  31 31-31            - 020000000000             sign
  */
 typedef s32 move_t;
 
@@ -47,8 +47,6 @@ enum {
 };
 
 typedef enum {
-    //M_INVALID   = -1,
-    //M_START     = 18,
     M_CAPTURE   = mask(0),
     M_ENPASSANT = mask(1),
     M_PROMOTION = mask(2),
@@ -57,21 +55,12 @@ typedef enum {
     M_CHECK     = mask(6)                         /* maybe unknown/useless ? */
 } move_flags_t;
 
-#define MOVE_FLAGS(m)   ((m) >> M_OFF_FLAGS)
-#define IS_CAPTURE(m)   (MOVE_FLAGS(m) & M_CAPTURE)
-#define IS_ENPASSANT(m) (MOVE_FLAGS(m) & M_ENPASSANT)
-#define IS_PROMOTION(m) (MOVE_FLAGS(m) & M_PROMOTION)
-#define IS_CASTLE(m)    (MOVE_FLAGS(m) & (M_CASTLE_K | M_CASTLE_Q))
-#define IS_CASTLE_K(m)  (MOVE_FLAGS(m) & M_CASTLE_K)
-#define IS_CASTLE_Q(m)  (MOVE_FLAGS(m) & M_CASTLE_Q)
-#define IS_CHECK(m)     (MOVE_FLAGS(m) & M_CHECK)
-
 #define MOVES_MAX   256
 
 typedef struct __movelist_s {
     move_t move[MOVES_MAX];
     int nmoves;                                   /* total moves (fill) */
-    int curmove;                                  /* current move (use) */
+    //int curmove;                                  /* current move (use) */
 } movelist_t;
 
 static inline square_t move_from(move_t move)
@@ -94,6 +83,19 @@ static inline piece_type_t move_captured(move_t move)
     return (move >> M_OFF_CAPT) & 07;
 }
 
+static inline move_flags_t move_flags(move_t move)
+{
+    return (move >> M_OFF_FLAGS) & 077;
+}
+
+#define is_capture(m)   (move_flags(m) & M_CAPTURE)
+#define is_enpassant(m) (move_flags(m) & M_ENPASSANT)
+#define is_promotion(m) (move_flags(m) & M_PROMOTION)
+#define is_castle(m)    (move_flags(m) & (M_CASTLE_K | M_CASTLE_Q))
+#define is_castle_K(m)  (move_flags(m) & M_CASTLE_K)
+#define is_castle_Q(m)  (move_flags(m) & M_CASTLE_Q)
+#define is_check(m)     (move_flags(m) & M_CHECK)
+
 static inline move_t move_make(square_t from, square_t to)
 {
     return (to << M_OFF_TO) | from;

src/position.c

@@ -95,10 +95,14 @@ pos_t *pos_clear(pos_t *pos)
 #   endif
     pos->node_count = 0;
     pos->turn = WHITE;
-    pos->clock_50 = 0;
-    pos->plycount = 0;
+
     pos->en_passant = SQUARE_NONE;
     pos->castle = 0;
+    pos->clock_50 = 0;
+    pos->plycount = 0;
+
+    for (square_t sq = A1; sq <= H8; ++sq)
+        pos->board[sq] = EMPTY;
 
     for (color_t color = WHITE; color <= BLACK; ++color) {
         for (piece_type_t piece = 0; piece <= KING; ++piece)
@@ -107,12 +111,12 @@ pos_t *pos_clear(pos_t *pos)
         pos->king[color] = SQUARE_NONE;
     }
 
-    for (square_t sq = A1; sq <= H8; ++sq)
-        pos->board[sq] = EMPTY;
-    pos->moves.curmove = 0;
-    pos->moves.nmoves = 0;
     pos->checkers = 0;
     pos->pinners = 0;
+    pos->blockers = 0;
+
+    //pos->moves.curmove = 0;
+    pos->moves.nmoves = 0;
     return pos;
 }
 

src/position.h

@@ -18,6 +18,7 @@
 
 #include "brlib.h"
 #include "bitops.h"
+#include "struct-group.h"
 
 #include "chessdefs.h"
 #include "bitboard.h"
@@ -28,19 +29,28 @@
 typedef struct __pos_s {
     u64 node_count;                               /* evaluated nodes */
     int turn;                                     /* WHITE or BLACK */
-    u16 clock_50;
-    u16 plycount;                                 /* plies so far, start is 0 */
 
-    square_t king[2];                             /* dup with bb, faster retrieval */
-    square_t en_passant;
-    castle_rights_t castle;
+    /* data which cannot be recovered by move_undo
+     * following data can be accessed either directly, either via "movesave"
+     * structure name.
+     * For example, pos->en_passant and pos->movesave.en_passant are the same.
+     * This allows a memcpy on this data (to save/restore position state).
+     */
+    struct_group_tagged(movesave, movesave,
+                 square_t en_passant;
+                 castle_rights_t castle;
+                 u16 clock_50;
+                 u16 plycount;                    /* plies so far, start is 0 */
+        );
+
+    piece_t board[BOARDSIZE];
 
     bitboard_t bb[2][PIECE_TYPE_MAX];             /* bb[0][PAWN], bb[1][ALL_PIECES] */
     bitboard_t controlled[2];                     /* unsure */
+    square_t king[2];                             /* dup with bb, faster retrieval */
     bitboard_t checkers;                          /* opponent checkers */
     bitboard_t pinners;                           /* opponent pinners */
     bitboard_t blockers;                          /* pieces blocking pin */
-    piece_t board[BOARDSIZE];
     movelist_t moves;
 } pos_t;
 

test/movegen-test.c

@@ -263,8 +263,8 @@ int main(int __unused ac, __unused char**av)
             printf("M: ");
             moves_print(&legal, 0);
         } else {
-            printf("[%s]\n\tMoves (OK): ", fen);
-            moves_print(&fishpos->moves, 0);
+            printf("[%s]: OK (%d Moves)\n", fen, legal.nmoves);
+            //moves_print(&fishpos->moves, 0);
         }
         //compare_moves(&fishpos->moves, &legal);
             //} else {