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Small question: how well do
inline and @specializedplay together? I wrote a small library for specialized collections and used macro trickery to escape most specialization problems ( https://github.com/denisrosset/metal -- warning the macro use is quite gross).
OK! thanks
So I'll stop looking.
because it's a huge mess
method specialization is OK, but specializing non-final classes is really hard and even after years of work not completely correct in Scala 2
I'm assuming you're looking at this for Spire ? What kind of specialization do you use ? Have you checked how much it's still needed when using Graal for example ?
Yes it is.. what I did in
metal was to have nonspecialized traits, but specialized methods... so you call (set: MySet[A]).contains[A](a), where the first type parameter is nonspecialized (MySet[A]), but the magic happens in the def contains[@specialized B](b: B). The macro system is there to put the right type parameters.
My immediate problem with Scala specialization was that
Map[@sp A, @sp B] fails to specialize for e.g. Map[AnyRef, Int].
But indeed, Spire on Dotty is an interesting thought. I have a talk at the ScalaDays about Spire generic approach. I haven't tried Dotty on it, neither Graal, that's an excellent suggestion.
maybe as a starting point for a discussion on https://contributors.scala-lang.org/
it's basically happening in my backyard so hard to miss it
I wonder if I'll have time to deeply think about specialization till the conference .. anyway, I'll dig into the generated bytecode, assembly for numerical code. While the presentation won't address specialization directly, it will give us food for thought!
so probably not, though we may get parallelization working well enough: lampepfl/dotty#4767
also if you're interested in speeding up either scala 2 or dotty, consider using graal: https://medium.com/graalvm/compiling-scala-faster-with-graalvm-86c5c0857fa3
I was using it as a reference but maybe I shouldn’t because its too early
I went to take a look at Dotty at the suggested site [https://dotty.epfl.ch/] and the Features section of the homepage contains two broken links [http://dotty.epfl.ch/docs/reference/other-new-features/auto-parameter-tupling.html, http://dotty.epfl.ch/docs/reference/other-new-features/multiversal-equality.html].
It creates a poor initial impression of Dotty's maturity.
