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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
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      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
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    2. Tim Sweeney‏ @TimSweeneyEpic Feb 1
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      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
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    3. Tim Sweeney‏ @TimSweeneyEpic Feb 1
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      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.

      2 replies 0 retweets 14 likes
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    4. Tim Sweeney‏ @TimSweeneyEpic Feb 1
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      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
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    5. Tim Sweeney‏ @TimSweeneyEpic Feb 1
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      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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      Tim Sweeney‏ @TimSweeneyEpic Feb 1
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      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.

      6:55 PM - 1 Feb 2020
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      • alarick 🥺 🌴🔥Mavreon Studios🔥🌴 Mike Chevalier Trevor Rosno RICHLAND GAMES Francesco Sapio James Koss Tamas Kenez MarsBEKET
      7 replies 0 retweets 34 likes
        1. Tim Sweeney‏ @TimSweeneyEpic Feb 1
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          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
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        1. Rusty Parks‏ @yaxamie Feb 1
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          Replying to @TimSweeneyEpic

          In ECMA languages I’ve used, == allows for conversion, but === doesn’t. If == allows for type conversion, then I’m not sure the “for all f” bit is expected. I think I’m missing some learned wisdom you possess here tho, as I’ve been in higher level languages more overall.

          0 replies 0 retweets 1 like
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        1. Clairvoire‏ @Clairvoire Feb 1
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          Replying to @TimSweeneyEpic

          I feel like this stance on integers/floats is leading to a single Number type, which a lot of high-level languages ultimately do. I never ever want types to promote on me, especially integers, their clamped finite entropy and bit access is what I like most in them.

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        1. Florian Hoenig‏ @rianflo Feb 1
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          Replying to @TimSweeneyEpic

          I really don’t mind the strict GLSL: uint a = 1u and error without the “u”.

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        1. Jan aka Sordid‏ @JanSordid Feb 3
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          Replying to @TimSweeneyEpic

          Aren't they the same in math? Real number 1 and Integer 1 are the same and all functions taking an Integer 1 will return the same as when they would receive a Real 1. We would just need to make sure Reals are a real superset to Integers

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