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mathias's profile
Mathias Bynens
Mathias Bynens
Mathias Bynens
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@mathias

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Mathias BynensVerified account

@mathias

I work on @ChromeDevTools & @v8js at Google and on ECMAScript through TC39. ♥ JavaScript, HTML, CSS, HTTP, performance, security, Bash, Unicode, i18n, macOS.

Munich, Germany
mths.be
Joined January 2007

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    1. ilya‏ @ilya_js 31 Jul 2018
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      .@mathias don't you think that native support of @typescriptlang by browsers would have much higher average perormance impact than #WebAssembly? So that we rely less on type predictions by engines at runtime.

      2 replies 0 retweets 7 likes
      Mathias Bynens‏Verified account @mathias 31 Jul 2018
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      Replying to @ilya_js @typescriptlang

      Not really — engines would still have to check the types at run-time. @sigurdschn explains some of the differences between TypeScript types and JS engine “types” in his presentation: https://www.youtube.com/watch?v=4tKSEKM64-c …pic.twitter.com/h0sA3YYjXP

      3:14 AM - 31 Jul 2018
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        2. Sigurd Schneider‏ @sigurdschn 31 Jul 2018
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          Replying to @mathias @ilya_js @typescriptlang

          We could treat type annotations as hints, which might work well if code adheres to them, but still requires type checks. This also raises the question of how to efficiently check that an object satisfies a type script interface (which V8 currently doesn't need to do).

          1 reply 0 retweets 2 likes
        3. ilya‏ @ilya_js 31 Jul 2018
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          Replying to @sigurdschn @mathias @typescriptlang

          But would you guys confirm the fact that typescript not only allows safer code but also improves performance meaning that turbo fan will need to do less deoptimizations?

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        2. Sigurd Schneider‏ @sigurdschn 31 Jul 2018
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          Replying to @mathias @ilya_js @typescriptlang

          Also, knowing that every argument object of a function implements a specific interface doesn't mean that properties of said interface can be loaded quickly; that depends on V8 observing that all argument objects have the same/a similar layout (which is a different thing).

          1 reply 0 retweets 1 like
        3. ilya‏ @ilya_js 31 Jul 2018
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          Replying to @sigurdschn @mathias @typescriptlang

          Are you referring to the shape here? Like number can be smi, heapnumber, etc.

          1 reply 0 retweets 0 likes
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        1. Sigurd Schneider‏ @sigurdschn 31 Jul 2018
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          Replying to @mathias @ilya_js @typescriptlang

          If large parts of code are typed in a sound way, i.e. such that V8 can rely on the types we could get away with type checks at the boundaries of these fragments. But how to identify those fragments & boundaries? (Crossing the boundary is now expensive because of type checks)

          0 replies 0 retweets 3 likes
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        1. Sigurd Schneider‏ @sigurdschn 31 Jul 2018
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          Replying to @mathias @ilya_js @typescriptlang

          So I'd say using type script types for optimization is definitely an interesting and even promising idea, but it's not straight-forward to do so.

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