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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 16 Aug 2016
      Replying to @JamesWidman @stephentyrone @jckarter

      If you read the standards (even old versions) & rationale it's clear this was just due to bad impls.

      2 replies 0 retweets 0 likes
    2. James Wolf-Man‏ @JamesWidman 16 Aug 2016
      Replying to @RichFelker

      I've referred to different versions of ISO C & C++ for several years, and I do not immediately recall any \

      1 reply 0 retweets 0 likes
    3. James Wolf-Man‏ @JamesWidman 16 Aug 2016
      Replying to @JamesWidman @RichFelker

      particular passage that makes this clear.

      2 replies 0 retweets 0 likes
    4. James Wolf-Man‏ @JamesWidman 16 Aug 2016
      Replying to @JamesWidman @RichFelker

      But regardless of the intentions of "The Founding Fathers," a very popular behavior was established, and then it was broken.

      1 reply 0 retweets 0 likes
    5. James Wolf-Man‏ @JamesWidman 16 Aug 2016
      Replying to @JamesWidman @RichFelker

      And it didn't need to be broken. E.g. if Clang had -fno-strict-aliasing set by default, it would still be a conforming impl.

      2 replies 0 retweets 0 likes
    6. Rich Felker‏ @RichFelker 16 Aug 2016
      Replying to @JamesWidman

      A conforming implementation that never performs vectorization unless perhaps you use the restrict keyword.

      1 reply 0 retweets 0 likes
    7. James Wolf-Man‏ @JamesWidman 16 Aug 2016
      Replying to @RichFelker

      This is understood, and this was the old behavior, and this was preferable to having shit break unexpectedly.

      1 reply 0 retweets 0 likes
    8. Rich Felker‏ @RichFelker 16 Aug 2016
      Replying to @JamesWidman

      The old behavior was having people write thousands of lines of SSE asm or intrinsics by hand, all non-portable & full of bugs..

      2 replies 0 retweets 0 likes
    9. James Wolf-Man‏ @JamesWidman 16 Aug 2016
      Replying to @RichFelker

      I accept that this is a real problem. I suggest that better solutions need to be found, \

      2 replies 0 retweets 0 likes
    10. James Wolf-Man‏ @JamesWidman 16 Aug 2016
      Replying to @JamesWidman @RichFelker

      because having the compiler assume things that it cannot prove is unacceptable in the long run.

      2 replies 0 retweets 0 likes
      Rich Felker‏ @RichFelker 16 Aug 2016
      Replying to @JamesWidman

      Um, any C compiler has to assume loads of things it can't prove. That's why any UB exists.

      10:42 AM - 16 Aug 2016
      • 1 Like
      • Matt Calabrese
      1 reply 0 retweets 1 like
        1. New conversation
        2. James Wolf-Man‏ @JamesWidman 16 Aug 2016
          Replying to @RichFelker

          I was referring to UB in general.

          1 reply 0 retweets 0 likes
        3. Rich Felker‏ @RichFelker 16 Aug 2016
          Replying to @JamesWidman

          Well to make a C impl where all UB has defined behavior you need to incur huge runtime costs, equiv to ASan+UBSan+much more.

          1 reply 0 retweets 0 likes
        4. James Wolf-Man‏ @JamesWidman 16 Aug 2016
          Replying to @RichFelker

          Um... no. Sanitizers are useful, but so is just having behavior defined in a way appropriate to platform.

          1 reply 0 retweets 0 likes
        5. Rich Felker‏ @RichFelker 16 Aug 2016
          Replying to @JamesWidman

          You missed the point. Defining most UB requires determining when it happens, which requires very expensive tracking.

          1 reply 0 retweets 0 likes
        6. James Wolf-Man‏ @JamesWidman 16 Aug 2016
          Replying to @RichFelker

          Or the code is written in such a way that it can absorb whatever naturally happens on the platform (without a check).

          2 replies 0 retweets 0 likes
        7. Rich Felker‏ @RichFelker 16 Aug 2016
          Replying to @JamesWidman

          "Whatever naturally happens" cannot be defined consistently when you have out-of-bounds pointer arithmetic, etc.

          1 reply 0 retweets 0 likes
        8. James Wolf-Man‏ @JamesWidman 16 Aug 2016
          Replying to @RichFelker

          One usually does not need to worry about supporting an infinite number of unknown platforms.

          1 reply 0 retweets 0 likes
        9. James Wolf-Man‏ @JamesWidman 16 Aug 2016
          Replying to @JamesWidman @RichFelker

          Like, some of us just do x86_64 posix & windows, and it's fine.

          1 reply 0 retweets 0 likes
        10. 5 more replies

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