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Terminate search early when the distance-to-initial-bucket is shorter than i

This commit is contained in:
Tony Garnock-Jones 2015-06-30 23:27:45 -04:00
parent 2ed7bb0d88
commit 1656f3aedc
1 changed files with 11 additions and 1 deletions
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12
treetrie.c
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@ -453,12 +453,22 @@ tt_node_ptr_t tt_arena_cons(tt_arena_t *a,
tt_node_idx_t candidate_i = tt_ptr_idx(candidate);
/* printf("cons at %d candidate %d\n", i, candidate); */
/* TODO: perhaps also bail early if we detect that the hash code changes */
if (candidate == TT_NO_PTR) {
/* printf("cons empty cell\n"); */
break;
}
{
tt_hash_t candidate_h = a->table[index].hash;
int distance = index - (candidate_h % a->table_length);
if (distance < 0) distance += a->table_length;
if (i > distance) {
/* printf("early exit as we found a slot that would have been used instead\n"); */
break;
}
}
/* printf("tag %d %d\n", tt_ptr_tag(candidate), tag); */
/* printf("index %d %d\n", a->headers[candidate].inuse.index, nindex); */
/* printf("a %d %d\n", a->nodes[candidate].a, na); */