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GCC Explorer - an interactive take on compilationGCC Explorer - an interactive take on compilationPosted May 25, 2012 10:50 UTC (Fri) by dgm (subscriber, #49227)In reply to: GCC Explorer - an interactive take on compilation by gughur Parent article: GCC Explorer - an interactive take on compilation
Except that it is not. The locale can change at anytime, so the jitter has to include a test for locale before the "fast" path. Pooof!, your improvement just (almost) went away and you added a whole lot of complexity to the machinery.
Beware of silver bullets.
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GCC Explorer - an interactive take on compilation Posted May 25, 2012 11:50 UTC (Fri) by gioele (subscriber, #61675) [Link]
> Except that it is not. The locale can change at anytime, so the jitter has to include a test for locale before the "fast" path. Pooof!, your improvement just (almost) went away and you added a whole lot of complexity to the machinery.
Except that it is still possible in most cases. For example the JRuby JIT + Java JIT will optimise various paths and functions and keep these optimised versions around until the "environment" changes. In that case it stops the world, throws away the old compiled units and create new ones taking into account the current situation. In practical terms this means that using `eval` works flawlessly but kills your performance.
GCC Explorer - an interactive take on compilation Posted Jun 13, 2012 8:15 UTC (Wed) by massimiliano (subscriber, #3048) [Link] The V8 Javascript VM does the same...
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