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Samstag, 24. Mai 2008 link

Kragen Sitaker and Aristotle Pagaltzis on strlen performance with UTF-8: "GCC is better at writing x86 assembly than I (Kragen) am. Aristotle is better at writing x86 assembly than GCC is. [The] penalty for counting [..] or iterating over the characters of a UTF-8 string [..] is very small."

I think the conclusion that "indexing into" an UTF-8 string is also carrying only a small penalty is the result an editorial mistake in Kragen's write-up; considering that in the introduction he quotes Aristotle with "All you lose with a variable-width encoding is direct random access to arbitrary indices in the string."

Otherwise, a very fine write-up. I just love this style of exposition, with a clearly-defined hypothesis, working code and proper performance measurements. Just like early CACM, and I think that's the way a lot of computer science (still) should be presented.


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