RFR: 8288971: AArch64: Clean up stack and register handling in interpreter [v4]

[Alan Bateman]

On Thu, 30 Jun 2022 15:14:29 GMT, Andrew Haley <aph at openjdk.org> wrote:

>> There are several places in the interpreter that could be improved.
>> 
>> 1. We use r13 to pass the caller's SP to a callee through adapters. r13 is not a callee-saved register in the native ABI, so this causes some complications. Use a callee-saved register.
>> 2. We frequently recalculate the location where the native SP needs to go. We have a spare slot in the interpreter frame, so we should calculate it once, when the frame is created, and use it.
>> 3. Related to 1, we should clearly label all the places where the caller's SP is passed to a callee.
>
> Andrew Haley has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update templateInterpreterGenerator_aarch64.cpp

tier1 or run hotspot/jtreg:jdk_loom. I think most of the jdk/jdk_loom tests will fail too, but for other reasons.

-------------

PR: https://git.openjdk.org/jdk/pull/9239