Comment #11 on issue 2551 by [email protected]: 3.16.14.1 -
String::Utf8Length() absurdly slow for lefty cons strings
http://code.google.com/p/v8/issues/detail?id=2551
Just to follow up. The microoptimization patch is here:
https://codereview.chromium.org/12783002
Performance gains were not huge, but they were definite, mostly from
reordering branches.
@erik.corry - I added in your suggested patch, which doesn't affect the
benchmarks in this bug much but makes a huge difference for longer strings.
@yangguo - your conditional bit set suggestion resulted in a regression,
oddly, maybe because it's not within a tight loop.
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