RFR: JDK-8316756: C2 EA fails with "missing memory path" when encountering unsafe_arraycopy stub call [v3]

[Tobias Hartmann]

On Tue, 16 Jan 2024 18:07:00 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Right, we could add this assert as well for expecting a narrow memory input in general. What are your thoughts about explicitly asserting for an unsafe arraycopy when visiting this call?
>
> No. There is another case (DTrace runtime call) with narrow memory: [parseHelper.cpp#L54](https://github.com/openjdk/jdk/blob/master/src/hotspot/share/opto/parseHelper.cpp#L54)

Since we need to integrate this P3 until tomorrow (Thursday), I'd suggest to integrate as-is and add the idea of adding an assert to the follow-up RFE.

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PR Review Comment: https://git.openjdk.org/jdk/pull/17347#discussion_r1454730476