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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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| brrt | \o | 08:27 | |
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| timo | brrt o/ | 09:13 | |
| you probably have a better idea than me / already know details about this topic: using lea instructions instead of add; when is it worth it, can the exprjit be easily taught how to apply it just by making a proper tile? can we fuse an a + n * b in the assembly into a lea when we see it without a more complicated optimization pass? | 09:16 | ||
| i even saw something like "5 * n turns into n + 4 * n" | 09:25 | ||
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| nine | Before adding new features I'd rather like the expr jit to be fixed... It is known to generate racy code and I simply gave up on trying to fix that. | 10:18 | |
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| timo | oh oops | 12:04 | |
| what does it race with? like, when you try to write code that works with atomics it re-orders things against your wishes? | |||
| (but also, maybe there is a tuit shaped like lea from someone who can't do the racyness fix, and maybe brrt has a tuit shaped like explaining the lea thing, etc) | 12:05 | ||
| ... where are my tuits? | |||
| both in a literal, and a metaphorical sense | |||
| nine | (template: gethow | 13:12 | |
| (let: (($how (^getf (^stable $1) MVMSTable HOW))) | |||
| (if (nz $how) | |||
| $how | |||
| (call (^func MVM_6model_get_how) | |||
| ... | |||
| You would think that we're fetching $how once into a register, check it and then return it. But in reality this generates 2 mov instructions reading from that memory location, resulting in a TOCTTOU race condition | |||
| jack9 | how to inspect moar bytecode | 13:45 | |
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| nine | jack9: moar --dump foo.mbc | 14:05 | |
| tellable6 | nine, I'll pass your message to jack9 | ||
| lizmat | And yet another Rakudo Weekly News hits the Net: rakudoweekly.blog/2023/01/23/2023-...nk-you-jj/ | 15:06 | |
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