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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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    1. Patrick Walton‏ @pcwalton 2 May 2018
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      Just implement generics already. Sheesh. https://github.com/google/gvisor/blob/master/tools/go_generics/generics.go …

      18 replies 121 retweets 397 likes
    2. Sanjay M.‏ @sjy 2 May 2018
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      Replying to @pcwalton

      "Just implement concurrency already" Or maybe "just implement a fast compiler already".

      2 replies 1 retweet 2 likes
    3. Patrick Walton‏ @pcwalton 3 May 2018
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      Replying to @sjy

      ML-style generics are extremely simple, as I’ve said repeatedly. They’re simpler than Go interfaces. It’s not about implementation difficulty. The problem is that, culturally, the Go team and community don’t want generics. That should change.

      3 replies 1 retweet 13 likes
    4. Sanjay M.‏ @sjy 4 May 2018
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      Replying to @pcwalton

      Does "extremely simple" imply monomorphization as an impl strategy? Maybe I'm just tired of horribly slow C++ compilers, but I kinda believe monomorphized generics are not a good default. I'd personally prefer something like Swift's approach (which is complicated).

      2 replies 0 retweets 0 likes
    5. Patrick Walton‏ @pcwalton 7 May 2018
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      Replying to @sjy

      Monomorphized generics are the right solution if you don’t have a JIT. They aren’t that slow. I’m convinced at this point that every attempt to work around monomorphization causes more problems than it solves. The complexity explodes, and often the overhead ends up worse.

      1 reply 0 retweets 1 like
    6. Sanjay M.‏ @sjy 7 May 2018
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      Replying to @pcwalton

      To be clear, I was talking about compile-speed, not runtime-speed. I'd be perfectly alright with compromising on runtime speed. I think Rust (and before Rust, C++) overly focuses on "zero-cost" abstractions, by accepting rather depressing consequences at compile-time.

      1 reply 0 retweets 0 likes
    7. Sanjay M.‏ @sjy 7 May 2018
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      Replying to @sjy @pcwalton

      Also, Swift's implementation is such that a particular generic instantiation can be monomorphized *at the compiler's discretion*, and interoperate with non-specialized code. This seems much much saner (especially if used in combination with PGO).

      2 replies 0 retweets 0 likes
      Patrick Walton‏ @pcwalton 8 May 2018
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      Replying to @sjy

      Well, I basically implemented Swift’s approach (intensional type analysis) in Rust in 2010 or so. The complexity is huge, and it often resulted in worse code bloat than just monomorphizing. We ripped it out and I haven’t looked back.

      8:21 AM - 8 May 2018 from Civic Center, San Francisco
      • 5 Likes
      • DanielMicay Dan Cecile "Thor" Wilson Bilkovich 👻🎃 Status Quo 🎃👻
      0 replies 0 retweets 5 likes

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