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pcwalton's profile
Patrick Walton
Patrick Walton
Patrick Walton
@pcwalton

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Patrick Walton

@pcwalton

Research engineer at Mozilla

San Francisco, CA
pcwalton.github.io
Joined November 2009

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    Patrick Walton‏ @pcwalton 21 Dec 2019
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    One simple reason why Rust can be slower to compile than C++, line for line, might be that it takes fewer lines of Rust code to generate the same amount of machine code. (I don’t know if this is true; it would be interesting to measure!)

    11:46 AM - 21 Dec 2019
    • 1 Retweet
    • 58 Likes
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    5 replies 1 retweet 58 likes
      1. New conversation
      2. Rich Felker‏ @RichFelker 21 Dec 2019
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        Replying to @pcwalton

        One line of C++ can generate unbounded amounts of machine code, and in practice it comes close in real world usage. 😝

        1 reply 1 retweet 11 likes
      3. Anti-‏ @crowder 21 Dec 2019
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        Replying to @RichFelker @pcwalton

        Was going to suggest that lang-code => machine-code is probably not a great metric of goodness.

        1 reply 0 retweets 1 like
      4. 1 more reply
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      2. C++ Delenda Est‏ @CodaFi_ 21 Dec 2019
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        Replying to @pcwalton

        The last “study” (arbitrary formulas attached to results, effectively marketing copy for this guy’s software metrics company, *shudder*) I read that tried a shootout here for the “instruction density” of a “line of code” concluded that we should all be writing Excel.

        1 reply 0 retweets 14 likes
      3. Kevin Cantú‏ @killerswan 21 Dec 2019
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        Replying to @CodaFi_ @pcwalton

        this is beautiful: it’s way higher level, further into userspace: I wonder how good Jupyter setups and Mathematica compare

        0 replies 0 retweets 0 likes
      4. End of conversation
      1. Payas‏ @PayasR 21 Dec 2019
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        Replying to @pcwalton

        In my personal experience, yes. I rewrote a C++ project in rust, and the LoC went down by ~20% (mainly because of chaining functions like .map.filter.collect()). The same happened in portions of other projects as well.

        0 replies 0 retweets 2 likes
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      1. Solal‏ @ArxSys 21 Dec 2019
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        Replying to @pcwalton

        Or just because the compiler do not just compile but also do the job of a separate static analyzer in cpp

        0 replies 0 retweets 1 like
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      2. glandium‏ @MikeHommey 21 Dec 2019
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        Replying to @pcwalton

        There's a lot of useful stuff in libstd that contributes to smaller code in Rust. If C++ had the same features in STL, it could arguably be slightly less verbose. On the flip side, I've found Rust to often require unreasonable amounts of boilerplate code.

        1 reply 0 retweets 0 likes
      3. Anthony Ramine‏ @nokusu 22 Dec 2019
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        Replying to @MikeHommey @pcwalton

        Boilerplate like what?

        0 replies 0 retweets 1 like
      4. End of conversation

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