> On Sep 29, 2014, at 9:23 AM, Mark S. Miller <[email protected]> wrote: > > On Mon, Sep 29, 2014 at 12:06 PM, Filip Pizlo <[email protected]> wrote: > [...] >>> I haven't actually seen anything about tail recursion optimizations being >>> implemented, have any of the VM actually tried or committed to implementing >>> tail call optimizations? >> >> We (JSC) haven’t. And we don’t plan to, because: >> >> - We still need to be able to reconstruct the original stack for things like >> function.caller and function.arguments. We are trying to remove the latter >> but the former still lives. > > First, kudos on trying to remove function.arguments. It would be awesome to > see this gone, and I greatly appreciate that you/JSC are willing to test the > waters. > > Although we would both like to see function.caller gone as well, we are also > both much more skeptical that this is possible. Let's assume that it is not. > The conclusion that follows is only that sloppy calls to sloppy functions > can't be TCOed away. That is in any case what we've been assuming. That's > why, IIRC (haven't checked lately), TCO is only specified for calls from > non-sloppy functions.
I agree! Thanks for the explanation. :-) -Filip > > [...] > -- > Cheers, > --MarkM
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