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A minor optimation to the rbt hash code that should reduce the number

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of calls to dns_name_fullcompare().
This commit is contained in:
Brian Wellington
2001-01-22 20:41:43 +00:00
parent 9d967288c3
commit 70b4889c85
1 changed files with 21 additions and 2 deletions
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23
lib/dns/rbt.c
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@@ -15,7 +15,7 @@
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: rbt.c,v 1.98 2001/01/09 21:51:13 bwelling Exp $ */
/* $Id: rbt.c,v 1.99 2001/01/22 20:41:43 bwelling Exp $ */
/* Principal Authors: DCL */
@@ -897,7 +897,25 @@ dns_rbt_findnode(dns_rbt_t *rbt, dns_name_t *name, dns_name_t *foundname,
if (hnode != NULL) {
current = hnode;
continue;
/*
* This is an optimization. If hashing found
* the right node, the next call to
* dns_name_fullcompare() would obviously
* return _equal or _subdomain. Determine
* which of those would be the case by
* checking if the full name was hashed. Then
* make it look like dns_name_fullcompare
* was called and jump to the right place.
*/
if (tlabels == nlabels) {
compared = dns_namereln_equal;
break;
} else {
common_labels = 1;
common_bits = 0;
compared = dns_namereln_subdomain;
goto subdomain;
}
}
if (tlabels++ < nlabels)
@@ -942,6 +960,7 @@ dns_rbt_findnode(dns_rbt_t *rbt, dns_name_t *name, dns_name_t *foundname,
* down pointer and search in the new tree.
*/
if (compared == dns_namereln_subdomain) {
subdomain:
/*
* Whack off the current node's common parts
* for the name to search in the next level.