RFR: 8299795: Relativize locals in interpreter frames [v4]

[Martin Doerr]

On Tue, 17 Jan 2023 08:35:45 GMT, Fredrik Bredberg <duke at openjdk.org> wrote:

>> Implementation of relativized locals in interpreter frames for x86. x64, arm, aarch64, ppc64le and riscv.
>> Not relativized locals on zero and s390 but done some changes to cope with the changed generic code.
>> Tested tier1-tier8 on supported platforms. The rest was sanity tested using Qemu, except s390, which was only tested by GitHub Actions.
>
> Fredrik Bredberg has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains five additional commits since the last revision:
> 
>  - Merge branch 'master' into relativize-locals-JDK-8299795_2023-01-09
>  - Added references to JDK-8300197
>  - Updated some copyright dates.
>  - Changed copyright date to 2023
>  - 8299795: Relativize locals in interpreter frames

src/hotspot/cpu/ppc/templateInterpreterGenerator_ppc.cpp line 1035:

> 1033:   __ sub(R12_scratch2, R18_locals, R1_SP);
> 1034:   __ srdi(R12_scratch2, R12_scratch2, Interpreter::logStackElementSize);
> 1035:   // Now &fp()[R12_scratch2] == R18_locals

I think this comment makes no sense. Please remove it. Otherwise, PPC64 code LGTM.

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PR: https://git.openjdk.org/jdk/pull/11902