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oe1cxw's profile
Claire Xen 🏳️‍⚧️🏳️‍🌈🧙🏻‍♀️ BLM 🏴🚩
Claire Xen 🏳️‍⚧️🏳️‍🌈🧙🏻‍♀️ BLM 🏴🚩
Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩
@oe1cxw

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Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩

@oe1cxw

Neurodiverse trans geek girl. Yosys, RISC-V, SAT/SMT.

She/her/hers
clairexen.net
Joined September 2014

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    1. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 19 Aug 2017
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      Very first draft of abstract for presentation on riscv-formal for a few upcoming conferences. Constructive feedback requested.pic.twitter.com/50LmDMZ8Qp

      4 replies 18 retweets 25 likes
    2. Alastair Reid‏ @alastair_d_reid 19 Aug 2017
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      Replying to @oe1cxw

      If you revert old bug fixes, can you detect the errors?

      1 reply 0 retweets 2 likes
    3. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 19 Aug 2017
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      Replying to @alastair_d_reid

      Yes. But it's hard to do with PicoRV32 because the bugfixes there predate riscv-formal..

      1 reply 0 retweets 0 likes
    4. Alastair Reid‏ @alastair_d_reid 19 Aug 2017
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      Replying to @oe1cxw

      What's the problem? Git revert bugfix; make verify. If it can catch it, partial success. Not as good as a fresh bug but reassuring.

      1 reply 1 retweet 1 like
    5. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 20 Aug 2017
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      Replying to @alastair_d_reid

      The problem is refactoring that happened between fixing most bugs and adding RVFI. But don't worry: I have some synthetic bugs for testing.

      1 reply 0 retweets 0 likes
    6. Alastair Reid‏ @alastair_d_reid 20 Aug 2017
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      Replying to @oe1cxw

      Fair enough. I guess the reason ISA Formal caught many bugs is that we applied it during development & test, not after all testing.

      2 replies 0 retweets 0 likes
    7. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 20 Aug 2017
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      Replying to @alastair_d_reid

      Many of the PicoRV32 bugs where found using formal methods. But this was before riscv-formal.

      1 reply 0 retweets 0 likes
    8. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 20 Aug 2017
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      Replying to @oe1cxw @alastair_d_reid

      Essentially I was comparing two differently configured versions of the core and/or different memory timings and checked >>

      1 reply 0 retweets 1 like
    9. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 20 Aug 2017
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      Replying to @oe1cxw @alastair_d_reid

      if the sequence of memory operations performed as function of the initial content of the memory is invariant between those versions.

      1 reply 0 retweets 1 like
      Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 20 Aug 2017
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      Replying to @oe1cxw @alastair_d_reid

      There is still one known bug left from this, but it's a performance bug: In certain (rare) situations PicoRV32 fetches an instruction twice.

      4:37 AM - 20 Aug 2017
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