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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 5 Jun 2017
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      Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩 Retweeted Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩

      I'm still not over this. In addition to UB the Verilog $random C code also relies on some IDB. 1/https://twitter.com/oe1cxw/status/870972176421330945 …

      Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩 added,

      Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩 @oe1cxw
      Replying to @oe1cxw
      That's not a hypothetical btw. The standardized behavior of Verilog $random (IEEE Std. 1364) relies on signed integer overflow.
      2 replies 6 retweets 7 likes
    2. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 5 Jun 2017
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      Replying to @oe1cxw

      Namely it assumes that "long" is 32 bits wide and that "float" is using the IEEE binary32 format.

      2 replies 0 retweets 1 like
    3. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 5 Jun 2017
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      Replying to @oe1cxw

      The latter is ridiculous considering that this is a function that has only integers as in- and outputs! (old seed, new seed, rand val)

      1 reply 0 retweets 0 likes
    4. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 5 Jun 2017
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      Replying to @oe1cxw

      But internally it first creates a uniformly distributed float random value in range (INT_MIN INT_MAX) and then converts that one to an int.

      2 replies 0 retweets 0 likes
    5. Joachim Strömbergson‏ @Kryptoblog 5 Jun 2017
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      Replying to @oe1cxw

      That is so horrible hackish. Why not even select a prng with known properties. Possibly a keyed one.

      1 reply 0 retweets 1 like
      Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 5 Jun 2017
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      Replying to @Kryptoblog

      I can only assume its because they made the standard match the horrible (backwards-compatible) implementation they already had.

      8:21 AM - 5 Jun 2017
      • 1 Like
      • Joachim Strömbergson
      2 replies 0 retweets 1 like
        1. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 5 Jun 2017
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          Replying to @oe1cxw @Kryptoblog

          And the horrible implementation they had was horrible because whoever initially wrote it in ~1983 didn't know anything about RNGs.

          0 replies 0 retweets 1 like
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        1. Joachim Strömbergson‏ @Kryptoblog 5 Jun 2017
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          Replying to @oe1cxw

          That is quite probable. Legacy sim models must work.

          0 replies 0 retweets 0 likes
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