RFR: 8290082: [PPC64] ZGC C2 load barrier stub needs to preserve vector registers

[Martin Doerr]

On Mon, 11 Jul 2022 14:09:58 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

> Preserve volatile vector registers in ZGC C2 load barrier stub.

Thanks for the prompt review! I have noticed that the first version may use more space below SP than allowed by ABI. 288 Bytes below SP are "volatile program storage", but we may use more when including the vector registers. I had to change the save & restore sequence a bit.

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PR: https://git.openjdk.org/jdk/pull/9453