#nmigen on 2021-01-15 — irc logs at freenode.irclog.whitequark.org

2020-12-07 01:53 ChanServ changed the topic of #nmigen to: nMigen hardware description language · code at https://github.com/nmigen · logs at https://freenode.irclog.whitequark.org/nmigen · IRC meetings each Monday at 1800 UTC · next meeting TBD

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01:22 <_whitenotifier> [YoWASP/yosys] whitequark pushed 1 commit to develop [+0/-0/±1] https://git.io/JtJjb

01:22 <_whitenotifier> [YoWASP/yosys] whitequark 9b90e21 - Update dependencies.

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03:00 <_whitenotifier> [nmigen] shenki opened pull request #579: docs: Update up_counter to avoid deprecation warning - https://git.io/JtUJp

03:02 <_whitenotifier> [nmigen] codecov[bot] commented on pull request #579: docs: Update up_counter to avoid deprecation warning - https://git.io/JtUUt

03:02 <_whitenotifier> [nmigen] codecov[bot] edited a comment on pull request #579: docs: Update up_counter to avoid deprecation warning - https://git.io/JtUUt

03:03 <_whitenotifier> [nmigen] codecov[bot] edited a comment on pull request #579: docs: Update up_counter to avoid deprecation warning - https://git.io/JtUUt

03:04 <_whitenotifier> [nmigen] codecov[bot] edited a comment on pull request #579: docs: Update up_counter to avoid deprecation warning - https://git.io/JtUUt

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09:43 <Sarayan> modwizcode: It's showing signs of life, including a correct E clock. Interesting side effect, a number of unused variables are generated (clang warns)

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15:47 <modwizcode> Sarayan: unused variables you say?

15:56 <Sarayan> Yeah, a bunch

15:56 <Sarayan> a clang++ -Wall -c should show you

15:57 <modwizcode> Interesting'

15:59 <modwizcode> I'm not sure I want to try debugging why it's generating unused stuff. Does it normally not generate unused variables?

16:00 <Sarayan> Not usually know, I think it would have affected whitequark's sensibilities

16:00 <Sarayan> s/know/no/

16:00 <Sarayan> 1395 warnings generated.

16:00 <Sarayan> for m68k.cc

16:00 <modwizcode> I feel similarly. I don't see that being something she'd accept either lol

16:01 <modwizcode> Uhh maybe I broke it when I fixed the other thing is all I can think?

16:01 <modwizcode> wait wtf

16:01 <Sarayan> clang++ -Wall -c m68k.cc -I/people/galibert/share/yosys/include -fbracket-depth=1024 is my command line to get them easily

16:01 <modwizcode> I just realized I'm on my branch with only the clock changes oh nevermind

16:01 <modwizcode> That's not relevant I did -g0 for this test so that's why it worked lol

16:02 <Sarayan> Yeah, that has has neither -g nor -O, which iirc means it's maxed on both

16:02 <modwizcode> I figured something out

16:02 <modwizcode> -g0 makes the warnings go away

16:02 <modwizcode> So that suggests I did indeed break something with my change

16:03 <modwizcode> In fact anything below -g4 works

16:03 <Sarayan> weird

16:03 <modwizcode> ugh that's frustrating. I think I'll have to understand what's going on with the liveness checking a bit more clearly

16:04 <Sarayan> That's terrible

16:04 <modwizcode> :/

16:04 <Sarayan> I hate having to understand stuff to debug them :-P

16:04 <modwizcode> I mean I was relying on everything else working so I didn't have to understand the exact flow of the pass.

16:06 <Sarayan> Yeah, that's pretty much what I meant, in fact

16:25 <modwizcode> I think I just noticed a bigger problem

16:26 <modwizcode> I take that back the bigger problem was my own stupidity

16:42 <Sarayan> One's own stupidity is always the biggest problem

16:44 <modwizcode> hey Sarayan: can you verify that the generated design with those unused variables actually works

16:44 <modwizcode> Because I want to try and rule out that the unused variables are cxxrtl failing to generate the logic that would utilize them, which would be a huge pain to solve probably.

16:45 <modwizcode> Incidentally I'm currently failing to create a simpler testcase that can produce the optimized out signals required to test that bug. I am able to reproduce the clock bug with a simple testcase though.

16:46 <modwizcode> oh no

16:46 <modwizcode> There's a bigger problem here lol damn it

16:46 <modwizcode> (can you still do that test this is unrelated)

16:49 <modwizcode> ugh I don't know if I should comment on the github PR or the issue lmao

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