I'm adding wasmjs target support for my applicatio...
# webassemblyl
loke
12/30/2023, 4:18 PMI'm adding wasmjs target support for my application, and I have found an inconsistency between wasmjs and all other platforms (I've tested on JVM, Linux and JS). The following code returns -0.0 for all these platforms, but 0.0 on wasmjs. Is this a bug?
Copy code
fun opDouble(x: Double, y: Double) =
if (x == 0.0) y else (y % x).let { result -> if (result != 0.0 && ((x < 0 && y > 0) || (x > 0 && y < 0))) x + result else result }
opDouble(2.0, -2.0)r
Robert Jaros
12/30/2023, 4:36 PMThe
%Robert Jaros
12/30/2023, 4:37 PMI'm not sure what the Kotlin specification says about this kind of operation.
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loke
12/30/2023, 4:38 PMYour example is interesting, and also raises more questions. The JS target result doesn't match my observations.
loke
12/30/2023, 4:38 PMIn any case, I want to call this a bug, since the arithmetic operations are supposed to behave the same, no?
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Robert Jaros
12/30/2023, 4:40 PMIt's probably hard question. Users of Kotlin on JVM would probably want to have the results like Java, but users of Kotlin/JS would like to have the results match those of JS 🙂
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loke
12/30/2023, 4:43 PMThat's fair, but at least JS and wasm should be the same, no?
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Robert Jaros
12/30/2023, 4:43 PMNo idea 🙂 Probably.
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Svyatoslav Kuzmich [JB]
12/30/2023, 6:37 PMThanks. Added your case to the issue https://youtrack.jetbrains.com/issue/KT-58681/K-Wasm-division-remainder-has-a-wrong-sign
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ephemient
12/30/2023, 6:39 PMarithmetic operations are supposed to behave the same, no?
why? https://en.m.wikipedia.org/wiki/IEEE_754#Reproducibility does not guarantee that
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loke
12/31/2023, 7:16 AM@Svyatoslav Kuzmich [JB] Thanks a lot.
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