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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    Rich Felker‏ @RichFelker 27 Apr 2016

    Rich Felker Retweeted Brian Mastenbrook

    This idiocy "if two have distinct single provenance, the result has empty provenance" invalidates real code w/no althttps://twitter.com/bmastenbrook/status/725048588053655554 …

    Rich Felker added,

    Brian Mastenbrook @bmastenbrook
    @ch3root well, this will not make you happy: http://www.open-std.org/JTC1/SC22/WG14/www/docs/n2012.htm#clarifying-the-c-memory-object-model-pointer-provenance …
    1:32 PM - 27 Apr 2016
    • 3 Retweets
    • 1 Like
    • Jason Meltzer Josh Simmons Jiri Horner
    1 reply 3 retweets 1 like
      1. New conversation
      2. Rich Felker‏ @RichFelker 27 Apr 2016
        Replying to @RichFelker

        As a particular example, it seems to make it impossible to implement https://en.wikipedia.org/wiki/XOR_linked_list …

        2 replies 0 retweets 1 like
      3. Alexander Cherepanov‏ @ch3root 27 Apr 2016
        Replying to @RichFelker

        @RichFelker Another case is a swap of pointers via xors. But are you sure this is an example of real code?

        1 reply 0 retweets 0 likes
      4. Rich Felker‏ @RichFelker 27 Apr 2016
        Replying to @ch3root

        @ch3root XOR linked list is a real-world need for implementing some things where you don't have space for 2 pointers.

        1 reply 0 retweets 0 likes
      5. Rich Felker‏ @RichFelker 27 Apr 2016
        Replying to @RichFelker

        @ch3root In-place algorithms on data structures where you only have one modifiable pointer-size slot.

        3 replies 0 retweets 0 likes
      6. Rich Felker‏ @RichFelker 27 Apr 2016
        Replying to @RichFelker

        @ch3root "XOR swap" on the other hand is cargo-cult-"optimization" BS.

        0 replies 0 retweets 1 like
      7. End of conversation

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