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refactor: (bb64)occupied -> ~(Bb64)PIECE_EMPTY

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Ole Morud
2026-01-07 20:17:55 +01:00
parent 5a5a392c8b
commit bb3d99b011
9 changed files with 71 additions and 83 deletions
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24
engine-types.h
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@@ -195,6 +195,7 @@ static char const* side_str[SIDE_COUNT] = {
/* https://en.wikipedia.org/wiki/X_macro */
/* enum value white char white unicode black char black unicode */
#define PIECES \
X(PIECE_EMPTY, 0.0f, ' ', ' ', ' ', ' ') \
X(PIECE_PAWN, 1.0f, 'P', 0x2659, 'p', 0x265F) \
X(PIECE_KNIGHT, 3.1f, 'N', 0x2658, 'n', 0x265E) \
X(PIECE_BISHOP, 3.2f, 'B', 0x2657, 'b', 0x265D) \
@@ -207,8 +208,8 @@ typedef enum piece : uint8_t {
#define X(e, v, wc, wu, bc, bu) e,
PIECES
PIECE_COUNT,
PIECE_BEGIN = 0,
PIECE_POISONED, /* used as default undefined value in debug builds */
PIECE_BEGIN = PIECE_PAWN,
PIECE_POISONED, /* used as undefined value in debug builds */
#undef X
} Piece8;
@@ -273,6 +274,25 @@ struct move {
#define APPEAL_MAX UINT8_MAX
uint8_t appeal;
};
/*
* Move32 layout:
* f (from piece): 3 bits
* F (from square): 6 bits
* t (to piece): 3 bits
* T (to square): 6 bits
* p (promotion): ? bits (likely 3)
* [x,x,x,x,x,x,x,x,x,x,x,p,p,p,T,T,T,T,T,T,t,t,t,F,F,F,F,F,F,f,f,f]
* */
typedef uint32_t Move32;
#define MOVE_FROM_PIECE(m) (m & 0b000000000000000000111)
#define MOVE_FROM_SQUARE(m) (m & 0b000000000000111111000)
#define MOVE_TO_PIECE(m) (m & 0b000000000111000000000)
#define MOVE_TO_SQUARE(m) (m & 0b000111111000000000000)
#define MOVE_PROMOTION(m) (m & 0b111000000000000000000)
_Static_assert(sizeof(struct move) == 4,
"this static assuming is here to check when sizeof(move) changes");