Chrome's new "Crankshaft" optimises JavaScript at runtime
Optimisation only makes sense if the code in question is used a lot – this seems to be the philosophy followed by the compilers of the latest incarnation of Google's free V8 JavaScript Engine. The new "Crankshaft" compilation infrastructure for V8 uses runtime information to see which parts of the code would benefit the most from optimisation. The developers say that the technique is mainly useful in large JavaScript programs; short scripts, such as those used by the SunSpider benchmark, do not benefit much.
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