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TimSweeneyEpic's profile
Tim Sweeney
Tim Sweeney
Tim Sweeney
@TimSweeneyEpic

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Tim Sweeney

@TimSweeneyEpic

Epic Games founder & CEO

epicgames.com
Joined August 2013

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    1. Tim Sweeney‏ @TimSweeneyEpic Feb 1
      • Report Tweet
      • Report NetzDG Violation

      The ideal performance property we should ask of a high-level programming language and library is that it minimizes runtime and compile-time combinatorial complexity. We can accept constant overheads, but not higher-order overheads. This has many implications.

      6 replies 6 retweets 106 likes
      Show this thread
    2. Tim Sweeney‏ @TimSweeneyEpic Feb 1
      • Report Tweet
      • Report NetzDG Violation

      One is that containers should be designed to minimize asymptotic complexity of operations. If concatenating strings is O(m+n), we’re doing it wrong. This means we can’t expect nice linear arrays in memory, but must pay some sort of dynamic control flow cost for accessing them.

      3 replies 0 retweets 13 likes
      Show this thread
      Tim Sweeney‏ @TimSweeneyEpic Feb 1
      • Report Tweet
      • Report NetzDG Violation

      The other is we should never copy a non-constant-sized data structure, but ensure it can be used in all contexts as-is or with the help of a constant sized adapter.

      6:48 PM - 1 Feb 2020
      • 14 Likes
      • The alternator Nate Churman Joel Beach Victor Ilyushchenko Eryk Dobson Drew Graham Danilo Heroso ADK Aidan Angel is game
      2 replies 0 retweets 14 likes
        1. New conversation
        2. Tim Sweeney‏ @TimSweeneyEpic Feb 1
          • Report Tweet
          • Report NetzDG Violation

          Next, we have to abandon manually synchronized memory concurrency. The combinatorial complexity here isn’t in performance but in programmer reasoning. We must either stay single-threaded or adopt purely functional programming or transactions.

          1 reply 3 retweets 30 likes
          Show this thread
        3. Tim Sweeney‏ @TimSweeneyEpic Feb 1
          • Report Tweet
          • Report NetzDG Violation

          Finally, types should obey the mathematical properties expected of them. This means we must adopt mathematical integers, and if we support smaller integer storage formats, they are still just for storage. The byte 255 plus the byte 1 is not the byte 0, it’s the integer 256.

          2 replies 2 retweets 17 likes
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        4. Tim Sweeney‏ @TimSweeneyEpic Feb 1
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          • Report NetzDG Violation

          If we support floating point, then the float 1.0f can’t be equal to integer 1, because there exist functions f where f(1.0f) is unequal to f(1), and a==b implies that for all f, f(a)==f(b). We must either say 1 is not equal to 1.0f, or that we aren’t allowed to compare them.

          7 replies 0 retweets 34 likes
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        5. Tim Sweeney‏ @TimSweeneyEpic Feb 1
          • Report Tweet
          • Report NetzDG Violation

          Programming languages should be built on principles first and foremost, and avoid conveniences that violate principles. So much of what’s wrong today is the result of design by “wouldn’t it be nice if” without an earnest enumeration of guiding principles.

          5 replies 12 retweets 73 likes
          Show this thread
        6. End of conversation
        1. OZ‏ @eugeniyoz Feb 1
          • Report Tweet
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          Replying to @TimSweeneyEpic

          only possible for immutable data.

          0 replies 0 retweets 0 likes
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