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So which of these implementations does speculation? I remember when RyuJIT came out it still wasn't speculative - has that now changed?

If you read the blog posts, they always talk about speculation being something they may try in the future. I've not seen anything where they say they went ahead and implemented it.



Here is some information

Background JIT overview, which is a kind of PGO for the .NET Frameworok

https://msdn.microsoft.com/en-us/magazine/mt683795.aspx

And I think this goes into line with what you are discussing,

https://github.com/dotnet/coreclr/pull/21270

I also agree that many things remain to be done in line with what Graal is capable of.


Yeah, I think this is the relevant bit: https://github.com/dotnet/coreclr/blob/master/Documentation/...

Seems like they started trying speculative optimizations about six months ago. Speculative optimizations are not only the foundation of Graal but also of C2, BTW.




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