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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 27 Apr 2018
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      I want to create a bitmask for the most right continuous range of set bits. For example 01010110 -> 00000110. Is (x & ~(x + (x & -x))) the best way to do that or is there a better solution? #followerpower

      4 replies 7 retweets 9 likes
    2. Xekri‏ @babbageboole 27 Apr 2018
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      Replying to @oe1cxw

      I defer to Knuth, 4A.7.1.3 formula 43, which suggests: x & ~[ (x|(x-1)) + 1] This is probably of the same complexity as your solution.

      1 reply 0 retweets 3 likes
    3. Xekri‏ @babbageboole 27 Apr 2018
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      Replying to @babbageboole @oe1cxw

      Or possibly lower complexity, I'm not sure. Is increment/decrement easier than general addition?

      1 reply 0 retweets 1 like
      Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 28 Apr 2018
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      Replying to @babbageboole

      Thanks, that's great! Re complexity: On AMD processors with TBM the whole expression (x|(x-1)) is a single instruction. (BLSFILL)

      4:15 AM - 28 Apr 2018
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