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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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    1. Rich Felker‏ @RichFelker Jul 17

      Optimization I'd like to see compilers be able to make: if (strlen(s)>100) -> if (strnlen(s,101)>100)

      6 replies 6 retweets 25 likes
      Show this thread
    2. John Regehr‏ @johnregehr Jul 18
      Replying to @RichFelker

      it's a good shortcut. you know of codes where this would make a noticeable difference?

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker Jul 18
      Replying to @johnregehr

      It's mainly hardening against extra linear factors (increased polynomial order) via untrusted inputs.

      9:39 AM - 18 Jul 2018
      • 2 Likes
      • Carlos O'Donell Steve Canon
      2 replies 0 retweets 2 likes
        1. New conversation
        2. Gok‏ @Gok Jul 18
          Replying to @RichFelker @johnregehr

          Wonder if there's code that relies on the trailing memory getting touched...

          1 reply 0 retweets 0 likes
        3. Steve Canon‏ @stephentyrone Jul 18
          Replying to @Gok @RichFelker @johnregehr

          😢

          1 reply 0 retweets 0 likes
        4. Rich Felker‏ @RichFelker Jul 18
          Replying to @stephentyrone @Gok @johnregehr

          It's possible there is, but if so this code is broken. The compiler is free to optimize out dead loads, which is ultimately what this is (if you think of it as inlining and unrolling the strlen).

          2 replies 0 retweets 0 likes
        5. Steve Canon‏ @stephentyrone Jul 18
          Replying to @RichFelker @Gok @johnregehr

          Cut to 2028: committee fixes this “bug” by making all string functions take volatile pointers.

          1 reply 0 retweets 2 likes
        6. John Regehr‏ @johnregehr Jul 18
          Replying to @stephentyrone @RichFelker @Gok

          2029: volatile pointers to volatile contents

          1 reply 1 retweet 3 likes
        7. Fabian Giesen‏ @rygorous Jul 18
          Replying to @johnregehr @stephentyrone and

          static volatile functions will solve this problem

          1 reply 0 retweets 3 likes
        8. olivier giroux‏ @__simt__ Jul 18
          Replying to @rygorous @johnregehr and

          There is talk of constexpr volatile.

          1 reply 0 retweets 4 likes
        9. John Regehr‏ @johnregehr Jul 18
          Replying to @__simt__ @rygorous and

          stop

          0 replies 0 retweets 2 likes
        10. End of conversation
        1. New conversation
        2. John Regehr‏ @johnregehr Jul 18
          Replying to @RichFelker

          also presumably it'll reduce segfaults in similar cases

          1 reply 0 retweets 1 like
        3. John Regehr‏ @johnregehr Jul 18
          Replying to @johnregehr @RichFelker

          I was just looking at LLVM's strlen-related optimizations and there are already a bunch, this one would be easy to add

          1 reply 0 retweets 5 likes
        4. Steve Canon‏ @stephentyrone Jul 18
          Replying to @johnregehr @RichFelker

          Yes, should be pretty easy.

          0 replies 0 retweets 1 like
        5. End of conversation

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