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Welcome to the main channel on the development of MoarVM, a virtual machine for NQP and Rakudo (moarvm.org). This channel is being logged for historical purposes. Set by lizmat on 24 May 2021. |
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| timo | ohai | 09:46 | |
| lizmat | timo o/! | 09:47 | |
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| nine | \o | 10:36 | |
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| [Coke] | tiiiiiiiiiimo | 13:23 | |
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| [Coke] | Can someone give me a sentence or two about "why we won't be including TCO in rakudo" if that's the case, moarvm specific rationale is fine, so I can write up a FAQ and close one of the currently open tickets? | 16:30 | |
| (I'm pretty sure the answer was no, but could be mistaken) | |||
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| nine | I guess the irclog would know the answer | 20:45 | |
| lizmat | I think codesections was to give an answer on that? | 21:06 | |
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| jnthn | To the degree there's a consensus on that, I think it's something like: an explicit mechanism to do tailcalls is fine, but needs runtime support and is made more complex because a Routine maybe having non-inlined Blocks and so there can be many VM-level stack frames that need removing. | 22:15 | |
| But TCO - doing it as an optimization - is tricky because features like CALLER and dynamic variables are impacted by it, and the late-bound nature of those mean they can be used at quite a distance. | 22:16 | ||
| So it's not really "no tailcalls", but "explicit tailcalls, and somebody needs to do the implementation work" | 22:17 | ||
| Oh, the interaction with LEAVE blocks is also fun :) | |||
| sub foo($n) { LEAVE say $n; $n ?? 1 !! $n * &foo.tailcall($n - 1) } ; foo(5); # what to do with this? | 22:19 | ||
| evalable6 | 5 | ||
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| jnthn | hah, go the conditional backwards :D | 22:19 | |
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