Hey Robert, It depends on the context: if your x is a property of the global object, then V8 still optimizes Math.pow in your example. Even if it's a local variable, we might still be able to optimize this in many cases.
But to answer your question: The polyfill assignment won't break the optimizations. HTH, Benedikt <[email protected]> schrieb am Mo., 18. Jan. 2016, 00:30: > Hi v8-dev, > > I read somewhere the other day that > > y=Math.pow() > > is much faster than > > x=Math.pow > y=x() > > because v8 can make a direct lookup of the symbol. I now wonder what > happens with polyfills of newly arrived functions like Math.cosh: > > Math.cosh = Math.cosh || function(x) { > return (Math.exp(x) + Math.exp(-x)) / 2; > }; > > Is a polyfill breaking the optimization because the function was maybe > labeled as changed or did you consider this somehow? > > Thanks Robert > > -- > -- > v8-dev mailing list > [email protected] > http://groups.google.com/group/v8-dev > --- > You received this message because you are subscribed to the Google Groups > "v8-dev" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- -- v8-dev mailing list [email protected] http://groups.google.com/group/v8-dev --- You received this message because you are subscribed to the Google Groups "v8-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
