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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 29 Aug 2019
    • Report Tweet
    • Report NetzDG Violation

    My general policy for by-value vs by-ref arguments in Rust is to take anything bigger than one register on 64-bit by reference. It might not always be 100% optimal on every architecture, but LLVM usually optimizes it, and it’s an easy and consistent rule to remember.

    2:14 PM - 29 Aug 2019
    • 9 Retweets
    • 68 Likes
    • эксепшн и бетон Either Paul Faria Yo Eight Bjørn Erik Pedersen Chris Davison Praveen Velliengiri Jason Mulligan Vaishali Thakkar
    2 replies 9 retweets 68 likes
      1. New conversation
      2. Eddy Bruel‏ @ejpbruel 29 Aug 2019
        • Report Tweet
        • Report NetzDG Violation
        Replying to @pcwalton

        Doesn't LLVM optimise by-value arguments larger than 64-bit by turning them into by-ref arguments anyway?

        2 replies 0 retweets 4 likes
      3. Patrick Walton‏ @pcwalton 29 Aug 2019
        • Report Tweet
        • Report NetzDG Violation
        Replying to @ejpbruel

        I’m not sure.

        1 reply 0 retweets 0 likes
      4. 6 more replies
      1. New conversation
      2. Michael Day‏ @yeslogic 29 Aug 2019
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        Replying to @pcwalton

        I've often wished that Rust had a "pass read-only by most efficient mechanism for type in question".

        2 replies 0 retweets 1 like
      3. Matt Calabrese‏ @CppSage 29 Aug 2019
        • Report Tweet
        • Report NetzDG Violation
        Replying to @yeslogic @pcwalton

        I agree and wish more languages had this too, although it is tricky more generally because of aliasing concerns (both in terms of correctness and performance).

        0 replies 0 retweets 0 likes
      4. End of conversation

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