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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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23
engine.h
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@@ -36,14 +36,17 @@ static void move_compute_appeal(struct move* restrict m,
Side8 them = other_side(us);
Piece8 const atk = mailbox[m->from];
uint8_t n = 1;
if (MASK_FROM_SQ(m->to) & pos->occupied[them]) {
uint8_t n = 0;
if ((MASK_FROM_SQ(m->to) & pos->pieces[them][PIECE_EMPTY]) == 0) {
n += (uint8_t)piece_value[mailbox[m->to]];
}
uint8_t mmv_lva_bonus = (uint8_t)(16.0f*(float)n - piece_value[atk]);
m->appeal = mmv_lva_bonus;
/* TODO: remove branch */
if (n) {
m->appeal = (uint8_t)(16.0f*(float)n - piece_value[atk]);
} else {
m->appeal = 0;
}
}
static float board_score_heuristic(struct pos const* pos)
@@ -52,9 +55,8 @@ static float board_score_heuristic(struct pos const* pos)
eventually flipping the sign based on `pos` */
float score = 0.0f;
Bb64 const occw = pos->occupied[SIDE_WHITE];
Bb64 const occb = pos->occupied[SIDE_BLACK];
Bb64 const occall = occw | occb;
Bb64 const occw = ~pos->pieces[SIDE_WHITE][PIECE_EMPTY];
Bb64 const occb = ~pos->pieces[SIDE_BLACK][PIECE_EMPTY];
enum game_progress const gp = endgameness(pos);
@@ -172,8 +174,9 @@ float quiesce(struct pos const* pos,
all_pseudolegal_moves(pos, MG_CAPTURES, us, &move_count, moves);
if (move_count == 0) {
return -(SCORE_CHECKMATE + (float)depth);
return score;
}
for (size_t i = 0; i < move_count; ++i) {
move_compute_appeal(&moves[i], pos, us, mailbox);
}
@@ -181,7 +184,7 @@ float quiesce(struct pos const* pos,
while (move_count) {
struct move m = moves_linear_search(moves, &move_count);
assuming((pos->occupied[them] | pos->ep_targets) & MASK_FROM_SQ(m.to));
assuming((~pos->pieces[them][PIECE_EMPTY] | pos->ep_targets) & MASK_FROM_SQ(m.to));
struct pos poscpy = *pos;