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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 26 May 2019
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      What's your preferred name for an asm instruction that calculates (rs1 & ~rs2)?

      5 replies 1 retweet 1 like
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    2. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 26 May 2019
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      Now the same thing for (rs1 | ~rs2)

      5 replies 0 retweets 1 like
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    4. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 26 May 2019
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      Replying to @TheMichaelBurge

      NIMPLIES for (rs1 & ~rs2)

      1 reply 0 retweets 1 like
    5. Matt‏ @matt_dz 26 May 2019
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      Replying to @oe1cxw @TheMichaelBurge

      One more alternative convention: NAND2B1: 2-Input NAND Gate with 1 Inverted and 1 Non-Inverted Inputs (https://www.xilinx.com/support/documentation/sw_manuals/xilinx10/books/docs/virtex_scm/virtex_scm.pdf#page=375 …) NOR2B1: 2-Input NOR Gate with 1 Inverted and 1 Non-Inverted Inputs (https://www.xilinx.com/support/documentation/sw_manuals/xilinx10/books/docs/virtex_scm/virtex_scm.pdf#page=400 …)

      1 reply 0 retweets 1 like
    6. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 26 May 2019
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      Replying to @matt_dz @TheMichaelBurge

      The fact that they have NAND2B1 _and_ OR2B1, as well as NOR2B1 _and_ AND2B1, makes me question their sanity, or at least their knowledge of De Morgan's laws.

      1 reply 0 retweets 0 likes
    7. Matt‏ @matt_dz 26 May 2019
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      Replying to @oe1cxw @TheMichaelBurge

      Note the inverted inputs: AND2B1 inverts I0 (so it would be ~rs1 & rs2).

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      Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 26 May 2019
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      Replying to @matt_dz @TheMichaelBurge

      But it's a gate for a netlist, so it really doesn't make any difference with input uses which label. (Whereas for instructions it makes sense to consistently invert rs2 for simpler ALU.) Also, the copy&paste f*ckups in their schematic symbols.. 🤦pic.twitter.com/UqW2b6y1cM

      5:15 AM - 26 May 2019
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        1. Matt‏ @matt_dz 26 May 2019
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          Replying to @oe1cxw @TheMichaelBurge

          This makes me think this might be a good argument for a boring, obvious name (subtlety as an anti-pattern in naming). {AND, OR}_INVERT_LATTER? (_NOT_LATTER?) Well, that, minus the verbosity! ;-)

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