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github.com/moarvm/moarvm | IRC logs at colabti.org/irclogger/irclogger_logs/moarvm Set by AlexDaniel on 12 June 2018. |
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| brrt | \o | 06:35 | |
| yoleaux | 9 Oct 2018 21:48Z <[Coke]> brrt: my TPF address is tpf-grants-secretary at perl-foundation.org. | ||
| brrt | thank you | ||
| nwc10 | o/ | 06:36 | |
| brrt | ohai nwc10 | 06:37 | |
| brrt is debugging jnthn's issue | 06:39 | ||
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| brrt | p6invokeunder is compiled and it really shouldn't be | 06:52 | |
| it twiddles the interp_cur_op | 06:54 | ||
| timotimo | that sounds like an easy fix for the explosions: remove the jitting of that op :) | 06:59 | |
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| masak | hi, was gonna re-voice everyone, but it turns out I don't have op on the channel ;) | 08:03 | |
| thank you for your continued patience | |||
| timotimo | until then, #perl6-dev is a fine place to talk about moarvm stuff as well, i reckon | 08:04 | |
| nwc10 | poor starving, er silent ilmari | 08:05 | |
| masak | ilmari: you can try miming what you want to say | ||
| nwc10 | masak: I fear that it's still the wee small hours of the morning in MST | 08:06 | |
| masak | nwc10: that's, like, the worst time to not have a voice | 08:09 | |
| timotimo | in +m, nobody can hear you scream | ||
| (except for ops) | |||
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| jnthn | good -moarning :) | 08:34 | |
| brrt | ohai jnthn | ||
| lizmat | hehe... we haz a voice! | ||
| brrt | you know what was the problem with reprname | ||
.oO( Power to the People! ) |
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| nwc10 | jnthn++ # UGT for all | 08:35 | |
| jnthn | .oO( Democracy. That was the problem with reprname. ) |
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| jnthn | brrt: So what was it? :) | 08:35 | |
| brrt | nothing. | 08:36 | |
| It wasn't compiled under the legacy JIT though | |||
| so if the merge_bbs step wouldn't happen, the expr jit would consume it | |||
| and it would continue onto compiling p6invokeunder | |||
| jnthn | oh! | ||
| brrt | which, as it happens, modifies tc->cur_frame->return_address to *tc->interp_cur_op + 6 | ||
| as you may or may not know, and for you sanity I hope you don't, but the special JIT invocation bytecode is only 4 bytes wide | 08:37 | ||
| lizmat is building and testing | |||
| jnthn | I didn't :) | ||
| brrt | so that will return into a goto NEXT which will read from the bytecode stream and jump into nonsense | 08:38 | |
| jnthn | haha | ||
| Wow :) | |||
| brrt++ for finding that | |||
| brrt | which actually explains a great many things, like how we ended up in the strings section of the ELF at some point | ||
| jnthn | lol | 08:39 | |
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| brrt | ohai | 11:26 | |
| I hit a snag with the invoke-jit thing | |||
| lizmat | yuck | 11:28 | |
| :q | |||
| oops :-) | |||
| brrt | the expression compiler will spill to the locals of the frame, because it assumes that its stack frame may be destroyed | 11:29 | |
| the nativecall-jit-in-non-jitted-code variant on the other hand, will not be able to do that, because the locals array can't be extended | 11:30 | ||
| since that would entail modifying the stack space. I... can probably hack arround that by having a spill policy flag or something | |||
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| brrt | or, I can spill-to-stack explicitly, and load-from-stack explicitly, hmmm | 11:49 | |
| that is essentially the same thing, isn't it | |||
| lizmat rubberducks | 11:54 | ||
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| brrt | [Coke]++ posted my grant request, please comment: news.perlfoundation.org/2018/10/gra...-comp.html | 14:14 | |
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| timotimo | comment sent | 16:06 | |
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| timotimo | m: say 0.384 / 0.0027 | 16:15 | |
| camelia | 142.222222 | ||
| timotimo | m: say 1.9 / 0.0027 | 16:16 | |
| camelia | 703.703704 | ||
| timotimo | who wants to know what that is? :P | 16:19 | |
| jnthn | Hopefully a speedup? :) | 16:20 | |
| timotimo | yeah, but an extreme cheat | 16:21 | |
| jnthn | Looks like :P | ||
| timotimo | my num @a = 1e0..500_000e0; my num @b = 500_000e0...1e0; my num $c = 5e0; my num @out; my $time = now; @out = @a Z+ (@b X* $c); say now - $time; say @out[99] | ||
| that's the slowest one | |||
| my num @a = 1e0..500_000e0; my num @b = 500_000e0...1e0; my num $c = 5e0; my num @out; my $time = now; for ^500_000 { @out[$_] = @a[$_] + @b[$_] * $c; }; say now - $time; say @out[99] | |||
| evalable6 | 1.835722 2499605 |
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| timotimo | this one's in the middle | ||
| evalable6 | 0.3862004 2499605 |
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| timotimo | use nqp; my num @a = 1e0..500_000e0; my num @b = 500_000e0...1e0; my num @c = 5e0; my num @out; my $time = now; nqp::vectorapply(@b, @c, @b, 95, 1, 64); nqp::vectorapply(@a, @b, @out, 93, 0, 64); say now - $time; say @out[99] | ||
| this one is very fast :) | |||
| jnthn | SIMD? | 16:24 | |
| timotimo | yep | 16:25 | |
| but no actually spelled-out intrinsics | |||
| just the C compiler doing it for me | |||
| literally a function with a bunch of tight loops that do only one operation either zip or cross | 16:26 | ||
| with checks for sizes and slot types and such | |||
| it'd even be faster without simd, i'm sure | 16:29 | ||
| i'm not entirely sure if spesh is currently capable of optimizing multiple occurences of metaops, like having a Z* and a Z+ somewhere | |||
| but i haven't actually checked | |||
| also, i got a very absurd result where having $c be @c instead, as a 500_000 slot num array with just 5e0 over and over and using @c[$_] in the loop, too | 16:30 | ||
| because it was faster | |||
| not in total, only the measured part | 16:33 | ||
| perhaps there's boxing/unboxing in one of the cases, but not in the other | 16:34 | ||
| i have no clue if this has a future at all :) | 16:42 | ||
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| nine | Turns out, when you don't have to pack argument information into flags to pass it on to some C code, the code can become quite a bit simpler. I wonder what that will do for performance | 19:19 | |
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| lizmat | :-) sounds cool | 19:23 | |
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