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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. Patrick Walton‏ @pcwalton Apr 2

      Patrick Walton Retweeted Robᵉʳᵗ Graham X🅂 Max

      Argh, no, not this again. People say that x86 is space efficient because of claims that Linus used to make during the 32-bit Pentium 4 days. It’s not true anymore, because the REX prefixes bloat x86-64 a lot. Measure binary sizes if you don’t believe me!https://twitter.com/ErrataRob/status/980908146070835201 …

      Patrick Walton added,

      Robᵉʳᵗ Graham X🅂 Max @ErrataRob
      4/ What little power is lost on the more complex instructions is gained back again by the more efficient encoding (x86 code is smaller than ARM code).
      Show this thread
      3 replies 5 retweets 36 likes
      Rich Felker‏ @RichFelker Apr 3
      Replying to @pcwalton

      I thought it was true with 32-bit ARM, just not with thumb2, but it seems either way it's smaller than x86_64 in my limited test set. Should investigate more.

      7:58 AM - 3 Apr 2018
      • 1 Like
      • Matt Godbolt
      1 reply 0 retweets 1 like
        1. New conversation
        2. Patrick Walton‏ @pcwalton Apr 3
          Replying to @RichFelker

          Yup, those REX prefixes really add up. The average instruction size for x86-64 is something like 3.8 bytes IIRC.

          1 reply 0 retweets 3 likes
        3. eddyb@lyken.rs‏ @eddyb_r Apr 3
          Replying to @pcwalton @RichFelker

          One of the RISC-V presentations had numbers, where RV was doing pretty well and then even between using the compressed ISA.

          2 replies 0 retweets 3 likes
        4. eddyb@lyken.rs‏ @eddyb_r Apr 3
          Replying to @eddyb_r @pcwalton @RichFelker

          Found it:https://youtu.be/_9O3nYkmLpc 

          0 replies 0 retweets 1 like
        5. End of conversation

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