RFR: 8329258: TailCall should not use frame pointer register for jump target [v2]

[Fei Yang]

On Thu, 11 Apr 2024 06:58:39 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

>> src/hotspot/cpu/aarch64/aarch64.ad line 16193:
>> 
>>> 16191: // TailJump below removes the return address.
>>> 16192: // Don't use rfp for 'jump_target' because a MachEpilogNode has already been
>>> 16193: // emitted just above the TailCall and it will reset rbp to the caller state.
>> 
>> Suggestion: s/rbp/rfp/
>
> Good catch! Will fix.

But the comment here says `it will reset rbp to the caller state`. I think `rbp` is x86-specific, right?

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PR Review Comment: https://git.openjdk.org/jdk/pull/18716#discussion_r1560518883