23084 2009-01-02 16:38:16 -0800 Avoid redundant AtomicString conversions 2009-01-06 06:35:59 -0800 1 1 1 Unclassified WebKit DOM 528+ (Nightly build) Mac OS X 10.5 RESOLVED FIXED P2 Normal --- 1 catfish.man catfish.man oldest_to_newest 104192 0 catfish.man 2009-01-02 16:38:16 -0800 Followup to #22699 for this review comment: > + pair<NodeListsNodeData::TagCacheMap::iterator, bool> result = data->nodeLists()->m_tagNodeListCaches.add(QualifiedName(nullAtom, name, namespaceURI), 0); > + if (result.second) > + result.first->second = new DynamicNodeList::Caches; > + > + return TagNodeList::create(this, namespaceURI.isEmpty() ? nullAtom : AtomicString(namespaceURI), name, result.first->second); It's inefficient to convert namespaceURI to an AtomicString twice here. It should be made into an AtomicString only once and reused. The best way to do this is to change the argument into an AtomicString in the first place in Node.h. This should be done for isDefaultNamespace, lookupPrefix, lookupNamespacePrefix, and getElementsByTagNameNS, since all those functions just end up making an AtomicString a moment later. Maybe in a separate patch, though. 104405 1 26427 catfish.man 2009-01-05 00:30:32 -0800 Created attachment 26427 Does what it says on the tin Much to my surprise this actually made a noticeable difference; My getElementsByTagName microbenchmark sped up by 20% or so, although the variance was so high I'm not sure how much that means. 104406 2 catfish.man 2009-01-05 00:41:01 -0800 Landed in r39596 104533 3 catfish.man 2009-01-05 23:06:52 -0800 Found a few more to remove 104534 4 26452 catfish.man 2009-01-05 23:07:37 -0800 Created attachment 26452 Cuts the time spent in AtomicString::add() by slightly more than half. 104563 5 darin 2009-01-06 06:35:59 -0800 One other thought. Converting to AtomicString early helps another way. If the argument for the DOM function itself is an AtomicString then the JavaScript UString can be converted to an AtomicString without first making a String, and if that value happens to already be in the AtomicString map, then this means there's no String allocation needed. 26427 2009-01-05 00:30:32 -0800 2009-01-05 00:36:51 -0800 Does what it says on the tin redundantatomicstrings.txt text/plain 4504 catfish.man SW5kZXg6IFdlYkNvcmUvQ2hhbmdlTG9nCj09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT0KLS0tIFdlYkNvcmUvQ2hhbmdlTG9n CShyZXZpc2lvbiAzOTU5NSkKKysrIFdlYkNvcmUvQ2hhbmdlTG9nCSh3b3JraW5nIGNvcHkpCkBA IC0xLDMgKzEsMTcgQEAKKzIwMDktMDEtMDQgIERhdmlkIFNtaXRoICA8Y2F0ZmlzaC5tYW5AZ21h aWwuY29tPgorCisgICAgICAgIFJldmlld2VkIGJ5IE5PQk9EWSAoT09QUyEpLgorCisgICAgICAg IEF2b2lkIHJlZHVuZGFudCBBdG9taWNTdHJpbmcgY29udmVyc2lvbnMKKworICAgICAgICAqIGRv bS9Ob2RlLmNwcDoKKyAgICAgICAgKFdlYkNvcmU6Ok5vZGU6OmdldEVsZW1lbnRzQnlUYWdOYW1l 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