RFR: 8257882: Implement linkToNative intrinsic on AArch64 [v2]

[Nick Gasson]

On Thu, 10 Dec 2020 10:21:09 GMT, Andrew Haley <aph at openjdk.org> wrote:

>> Er... no. But not because of the cast. The `push(fp_spills)` below should be `push_fp(fp_spills)`. I'll add a FloatRegister constructor to RegSet so it doesn't need that any more. There's one other place that does it in cpu/aarch64/gc/z/zBarrierSetAssembler_aarch64.cpp
>
> push_fp() doesn't make much sense if the RegSet is a set of Registers, which are by definition not FloatRegisters. That casting of Register to FloatRegister in gc/z is evil.

Should we have a separate RegSet type for FloatRegisters to avoid mixing them up?

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PR: https://git.openjdk.java.net/jdk/pull/1711