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From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
To: Libre-RISCV General Development <libre-riscv-dev@lists.libre-riscv.org>
Subject: Re: [libre-riscv-dev] bisecting nmigen
Date: Sat, 11 Jul 2020 12:34:43 +0100
Message-ID: <CAPweEDy9Vu1G5X90bsRs0eSnm_50rM5JxYCtF-MKjFvdh_LSpQ@mail.gmail.com> (raw)
In-Reply-To: <CAPweEDz46r7GqEmir4=HK_rby3CVZWLZT5D2J4Y+w32XjAW7zA@mail.gmail.com>

commit 2606ee33ad548bed1b9294bbca3962e834d12fd0
Author: whitequark <whitequark@whitequark.org>
Date:   Sun Jun 28 05:04:16 2020 +0000

    back.pysim: simplify.

    Remove _EvalContext, which was a level of indirection serving almost
    no purpose. (The only case where it would be useful is repeatedly

turns out it does serve a purpose: the div simulation hasn't completed
in 10 minutes, where it normally takes... maybe... 25 seconds?  i've
stopped it running.


commit 6d417568ad68565fc7e01e7611ce8cf0b8fdb603
Author: whitequark <whitequark@whitequark.org>
Date:   Wed Jul 8 08:29:20 2020 +0000

    back.pysim: only extract signal names if VCD is requested.

    This commit also fixes an issue introduced in 2606ee33 that regressed
    simulator startup time and bloated VCD files. (It's actually about
    10% faster now than *before* the regression was introduced.)

it's not complete.  i ran a diff on the vcd files: it looks to me like
it's actually dumping zeros into the vcd file.  as in: *actual* zero
values are being outputted.  in other words there's nothing wrong
*with the vcd file itself*: nmigen has *outputted zeros* into a VCD
file that is correctly and legally formatted.

in the meantime whilst that's being sorted, it is necessary to use
this git revision:

commit 303ea18cb60567e45a755c6b6289a601f27d46e6 (HEAD, tag: working2)
Author: Alan Green <alan.green@gmail.com>
Date:   Tue Jun 23 22:12:02 2020 +1000

    _yosys: handle unparseable versions

l.

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Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CAPweEDx7hh_eia79gvefVq2J13rbvyAum-5jxr-XX+9SHFG6CQ@mail.gmail.com>
     [not found] ` <CAC2bXD55UhNWrqsAQCKczTd=7oSWWrpDSrvLmvHeu77ZZ8mJVQ@mail.gmail.com>
     [not found]   ` <CAPweEDyJ7ZZFim9vk3YK1ttdARnfqeWqtdV_FeDJ-sfcSW4CTg@mail.gmail.com>
     [not found]     ` <CAC2bXD4OSaJ7VR0QaqkHJnTR2b5hvuy-o_jcs7DSWAgPPi906A@mail.gmail.com>
     [not found]       ` <CAPweEDy0R6vXm=Lm166dvNf39h4pnbT-ZdnOtDEu8H1+Vmzs9Q@mail.gmail.com>
     [not found]         ` <CAC2bXD7yK_pJkNTicyOV3jhwR-Wv+yQFw49sKqeBifR1tYC4-Q@mail.gmail.com>
2020-07-10 12:33           ` [libre-riscv-dev] daily kan-ban update 09jul2020 Luke Kenneth Casson Leighton
2020-07-10 17:13             ` Jacob Lifshay
2020-07-10 17:25               ` Luke Kenneth Casson Leighton
2020-07-10 17:59                 ` Jacob Lifshay
2020-07-10 20:44                   ` Luke Kenneth Casson Leighton
2020-07-10 21:13                     ` Jacob Lifshay
2020-07-11  0:46                       ` [libre-riscv-dev] bisecting nmigen Jacob Lifshay
2020-07-11  1:12                         ` Luke Kenneth Casson Leighton
2020-07-11  3:04                           ` Jacob Lifshay
2020-07-11  8:58                             ` Luke Kenneth Casson Leighton
2020-07-11 11:34                               ` Luke Kenneth Casson Leighton [this message]
2020-07-13  1:14                                 ` Jacob Lifshay
2020-07-13  9:43                                   ` Luke Kenneth Casson Leighton

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