// Obtain a sorted move list.
static int get_sortable_move_list(searchNode *node, sortable_move_t * move_list,
int hash_table_move) {
// number of moves in list
int num_of_moves = generate_all_opt(&(node->position), move_list, false);
color_t fake_color_to_move = color_to_move_of(&(node->position));
move_t killer_a = killer[KMT(node->ply, 0)];
move_t killer_b = killer[KMT(node->ply, 1)];
// sort special moves to the front
for (int mv_index = 0; mv_index < num_of_moves; mv_index++) {
move_t mv = get_move(move_list[mv_index]);
if (mv == hash_table_move) {
set_sort_key(&move_list[mv_index], SORT_MASK);
} else if (mv == killer_a) {
set_sort_key(&move_list[mv_index], SORT_MASK - 1);
} else if (mv == killer_b) {
set_sort_key(&move_list[mv_index], SORT_MASK - 2);
} else {
ptype_t pce = ptype_mv_of(mv);
rot_t ro = rot_of(mv); // rotation
square_t fs = from_square(mv);
int ot = ORI_MASK & (ori_of(node->position.board[fs]) + ro);
square_t ts = to_square(mv);
set_sort_key(&move_list[mv_index],
best_move_history[BMH(fake_color_to_move, pce, ts, ot)]);
}
}
return num_of_moves;
}
static void sort_secondary(struct tracing_map *map,
const struct tracing_map_sort_entry **entries,
unsigned int n_entries,
struct tracing_map_sort_key *primary_key,
struct tracing_map_sort_key *secondary_key)
{
int (*primary_fn)(const struct tracing_map_sort_entry **,
const struct tracing_map_sort_entry **);
int (*secondary_fn)(const struct tracing_map_sort_entry **,
const struct tracing_map_sort_entry **);
unsigned i, start = 0, n_sub = 1;
if (is_key(map, primary_key->field_idx))
primary_fn = cmp_entries_key;
else
primary_fn = cmp_entries_sum;
if (is_key(map, secondary_key->field_idx))
secondary_fn = cmp_entries_key;
else
secondary_fn = cmp_entries_sum;
for (i = 0; i < n_entries - 1; i++) {
const struct tracing_map_sort_entry **a = &entries[i];
const struct tracing_map_sort_entry **b = &entries[i + 1];
if (primary_fn(a, b) == 0) {
n_sub++;
if (i < n_entries - 2)
continue;
}
if (n_sub < 2) {
start = i + 1;
n_sub = 1;
continue;
}
set_sort_key(map, secondary_key);
sort(&entries[start], n_sub,
sizeof(struct tracing_map_sort_entry *),
(int (*)(const void *, const void *))secondary_fn, NULL);
set_sort_key(map, primary_key);
start = i + 1;
n_sub = 1;
}
}
// Obtain a sorted move list.
static int get_sortable_move_list(searchNode *node, sortable_move_t * move_list,
int hash_table_move) {
// number of moves in list
int num_of_moves = generate_all(&(node->position), move_list, false);
color_t fake_color_to_move = color_to_move_of(&(node->position));
move_t killer_a = killer[KMT(node->ply, 0)];
move_t killer_b = killer[KMT(node->ply, 1)];
for (int mv_index = 0; mv_index < num_of_moves; mv_index++) {
move_t mv = move_list[mv_index]; // don't use get_move. assumes generate_all doesn't bungle up high bits
if (mv == hash_table_move) {
set_sort_key(&move_list[mv_index], SORT_MASK);
} else if (mv == killer_a) {
set_sort_key(&move_list[mv_index], SORT_MASK - 1);
} else if (mv == killer_b) {
set_sort_key(&move_list[mv_index], SORT_MASK - 2);
} else {
ptype_t pce = ptype_mv_of(mv);
rot_t ro = rot_of(mv); // rotation
square_t fs = from_square(mv);
int ot = ORI_MASK & (ori_of(node->position.board[fs]) + ro);
square_t ts = to_square(mv);
set_sort_key(&move_list[mv_index],
best_move_history[BMH(fake_color_to_move, pce, ts, ot)]);
}
sortable_move_t insert = move_list[mv_index];
// TODO: enable this optimization for final since node counts change
// if (insert > SORT_MASK) {
int hole = mv_index;
while (hole > 0 && insert > move_list[hole-1]) {
move_list[hole] = move_list[hole-1];
hole--;
}
move_list[hole] = insert;
// }
}
return num_of_moves;
}
/**
* tracing_map_sort_entries - Sort the current set of tracing_map_elts in a map
* @map: The tracing_map
* @sort_key: The sort key to use for sorting
* @sort_entries: outval: pointer to allocated and sorted array of entries
*
* tracing_map_sort_entries() sorts the current set of entries in the
* map and returns the list of tracing_map_sort_entries containing
* them to the client in the sort_entries param. The client can
* access the struct tracing_map_elt element of interest directly as
* the 'elt' field of a returned struct tracing_map_sort_entry object.
*
* The sort_key has only two fields: idx and descending. 'idx' refers
* to the index of the field added via tracing_map_add_sum_field() or
* tracing_map_add_key_field() when the tracing_map was initialized.
* 'descending' is a flag that if set reverses the sort order, which
* by default is ascending.
*
* The client should not hold on to the returned array but should use
* it and call tracing_map_destroy_sort_entries() when done.
*
* Return: the number of sort_entries in the struct tracing_map_sort_entry
* array, negative on error
*/
int tracing_map_sort_entries(struct tracing_map *map,
struct tracing_map_sort_key *sort_keys,
unsigned int n_sort_keys,
struct tracing_map_sort_entry ***sort_entries)
{
int (*cmp_entries_fn)(const struct tracing_map_sort_entry **,
const struct tracing_map_sort_entry **);
struct tracing_map_sort_entry *sort_entry, **entries;
int i, n_entries, ret;
entries = vmalloc(map->max_elts * sizeof(sort_entry));
if (!entries)
return -ENOMEM;
for (i = 0, n_entries = 0; i < map->map_size; i++) {
struct tracing_map_entry *entry;
entry = TRACING_MAP_ENTRY(map->map, i);
if (!entry->key || !entry->val)
continue;
entries[n_entries] = create_sort_entry(entry->val->key,
entry->val);
if (!entries[n_entries++]) {
ret = -ENOMEM;
goto free;
}
}
if (n_entries == 0) {
ret = 0;
goto free;
}
if (n_entries == 1) {
*sort_entries = entries;
return 1;
}
ret = merge_dups(entries, n_entries, map->key_size);
if (ret < 0)
goto free;
n_entries -= ret;
if (is_key(map, sort_keys[0].field_idx))
cmp_entries_fn = cmp_entries_key;
else
cmp_entries_fn = cmp_entries_sum;
set_sort_key(map, &sort_keys[0]);
sort(entries, n_entries, sizeof(struct tracing_map_sort_entry *),
(int (*)(const void *, const void *))cmp_entries_fn, NULL);
if (n_sort_keys > 1)
sort_secondary(map,
(const struct tracing_map_sort_entry **)entries,
n_entries,
&sort_keys[0],
&sort_keys[1]);
*sort_entries = entries;
return n_entries;
free:
tracing_map_destroy_sort_entries(entries, n_entries);
return ret;
}