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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. Loch Nessa Monster 🌸‏ @pasiphae_goals 2 Dec 2017

      lobste.rs is reddit for people who think they’re too good for redditpic.twitter.com/UI8Ha347C8

      3 replies 5 retweets 44 likes
    2. Alexander “bad code no docs” Payne‏ @myrrlyn 2 Dec 2017
      Replying to @pasiphae_goals

      In fairness, I have the same question

      1 reply 0 retweets 4 likes
    3. Loch Nessa Monster 🌸‏ @pasiphae_goals 2 Dec 2017
      Replying to @myrrlyn

      I mean I feel like “for shits and giggles” is a decent answer.

      3 replies 2 retweets 10 likes
    4. Steve Canon‏ @stephentyrone 2 Dec 2017
      Replying to @pasiphae_goals @myrrlyn

      That or "because compilers are a #%#@!@#$ing trainwreck at times."

      1 reply 0 retweets 1 like
    5. Alexander “bad code no docs” Payne‏ @myrrlyn 2 Dec 2017
      Replying to @stephentyrone @pasiphae_goals

      I mean, yes. I can think of almost nothing that would warrant hand-rolled ASM but maybe I'm blinkered

      1 reply 0 retweets 1 like
    6. Steve Canon‏ @stephentyrone 2 Dec 2017
      Replying to @myrrlyn @pasiphae_goals

      Compilers generate perfectly adequate code for most programs. For compute-bound sections with non-trivial data access patterns or dependencies, humans are still much, much better.

      2 replies 0 retweets 5 likes
    7. Steve Canon‏ @stephentyrone 2 Dec 2017
      Replying to @stephentyrone @myrrlyn @pasiphae_goals

      Also, perversely, there are some things that are *really* awkward to write in C-ish langs without invoking UB, but trivial in asm.

      1 reply 1 retweet 8 likes
    8. John Regehr‏ @johnregehr 2 Dec 2017
      Replying to @stephentyrone @myrrlyn @pasiphae_goals

      rotl

      2 replies 0 retweets 3 likes
    9. Steve Canon‏ @stephentyrone 2 Dec 2017
      Replying to @johnregehr @myrrlyn @pasiphae_goals

      Yup. A few of the many others: - Saturating convert float -> int. - Aligned load/store that accesses outside the edge of a buffer (but, because aligned, is safe on the targeted arch). - Popcount / CLZ / CTZ (ok, these have gcc builtins). ...

      3 replies 0 retweets 8 likes
      Rich Felker‏ @RichFelker 2 Dec 2017
      Replying to @stephentyrone @johnregehr and

      Reportedly LLVM pattern-recognizes de Bruijn approach to ctz & generates the insn portably.

      3:02 PM - 2 Dec 2017
      • 3 Likes
      • John Regehr Peter Barfuss 𒀱 Alexander “bad code no docs” Payne
      2 replies 0 retweets 3 likes
        1. New conversation
        2. Steve Canon‏ @stephentyrone 2 Dec 2017
          Replying to @RichFelker @johnregehr and

          That’s strictly worse than a builtin for my purposes: silent perf hazard if someone uses a compiler that doesn’t pattern match.

          1 reply 0 retweets 1 like
        3. Rich Felker‏ @RichFelker 2 Dec 2017
          Replying to @stephentyrone @johnregehr and

          It's actually pretty much the same speed, just larger size.

          0 replies 0 retweets 1 like
        4. End of conversation
        1. New conversation
        2. John Regehr‏ @johnregehr 2 Dec 2017
          Replying to @RichFelker @stephentyrone and

          these recognizers are often not too robust though

          1 reply 0 retweets 0 likes
        3. Rich Felker‏ @RichFelker 2 Dec 2017
          Replying to @johnregehr @stephentyrone and

          It should just recognize that the expression is purely a function of the low bit set (x&-x), & thus only has 32 or 64 possible inputs. Then it can just iterate them and check if all the outputs match a known function.

          0 replies 0 retweets 0 likes
        4. End of conversation

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