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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. Aliaksei Chapyzhenka‏ @wavedrom 21 Oct 2018
      • Report Tweet
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      Aliaksei Chapyzhenka Retweeted Xekri

      How many other NOP opcodes in @risc_v ?https://twitter.com/babbageboole/status/1054144450342006785 …

      Aliaksei Chapyzhenka added,

      Xekri @babbageboole
      Here's how @risc_v does nothing for anyone. pic.twitter.com/RuZHyBdZw7
      1 reply 4 retweets 10 likes
    2. Xekri‏ @babbageboole 22 Oct 2018
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      Replying to @wavedrom @risc_v

      Officially one. But nearly every instruction can be a nop with the right arguments.

      1 reply 0 retweets 1 like
    3. Aliaksei Chapyzhenka‏ @wavedrom 24 Oct 2018
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      Replying to @babbageboole @risc_v

      I wonder how many EXACTLY NOPs in the ISA. I counted RV32I = 3945472 ; RV64I adds : 142336 ; Here is my formulahttps://beta.observablehq.com/@drom/nop-v 

      5 replies 1 retweet 5 likes
    4. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 25 Oct 2018
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      Replying to @wavedrom @babbageboole @risc_v

      Missing afaict: AUIPC with Rd=0, branches to the next address, jump to next address, AND/OR of A with A written to A, LD to x0 (only NOP from valid non-io addr), CSR-based nops (i.e. Rd to x0, ignored writes)

      3 replies 0 retweets 3 likes
    5. whitequark‏ @whitequark 25 Oct 2018
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      Replying to @oe1cxw @wavedrom and

      if you count 2-opcode sequences the amount of nops becomes even larger...

      1 reply 0 retweets 0 likes
    6. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 25 Oct 2018
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      Replying to @whitequark @wavedrom and

      I also thought about that but to me it doesn't feel like it's a proper nop if there's an observable changed in-between state. (Also: it would mean that there are indefinitely many nops, which kind of wrecks the whole exercise. :)

      1 reply 0 retweets 2 likes
      Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 25 Oct 2018
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      Replying to @oe1cxw @whitequark and

      (indefinitely if you allow for n-opcode sequences that is, which would be the next logical step)

      2:29 AM - 25 Oct 2018
      1 reply 0 retweets 0 likes
        1. whitequark‏ @whitequark 25 Oct 2018
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          Replying to @oe1cxw @wavedrom and

          clearly the next logical step is an OISC where the only operation is a nop

          0 replies 0 retweets 1 like
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