> From: Andreas Rossberg <[email protected]> > To: Katelyn Gadd <[email protected]> > Cc: es-discuss <[email protected]> > Date: Mon, 3 Nov 2014 08:54:16 +0100 > Subject: Re: typed array filling convenience AND performance > On 31 October 2014 16:40, Katelyn Gadd <[email protected]> wrote: > > I'd also like to chime in since this is a real problem for > > performance-sensitive JSIL code: > > The idea that JS runtimes will just optimize all our > > performance-sensitive loops is lovely. It also appears to be a > > fantasy, because we've been writing those loops for years and > > they're still slow. I did some extensive testing and experimentation > > with spidermonkey a year or so back, examining how it optimized > > various forms of a memcpy loop, and the results were pretty dire. V8 > > didn't seem to fare much better, though it is harder to tell because > > they don't trivially expose generated native code for functions. > > Hm, just an aside, but I wonder what you mean by "trivially" here. It > is only one flag away.
Try `node --allow-natives-syntax`, and take a look at the runtime-*.cc files at https://github.com/v8/v8-git-mirror/tree/master/src/runtime (`grep RUNTIME_FUNCTION`) > > /Andreas
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