[jdk11u-dev] RFR: 8242449: AArch64: r27 can be allocated in CompressedOops mode

[Andrew Haley]

On Thu, 15 Jul 2021 13:32:08 GMT, Dmitry Chuyko <dchuyko at openjdk.org> wrote:

> This optimization saves a register in compressed oops mode. It requires JDK-8233743 as a prerequisite and JDK-8249781 as a post-fix. Original patch has been adjusted to use Universe::narrow_ptrs_base() instead of CompressedOops::ptrs_base() (no JDK-8223136) and for slightly different context (no JDK-8235385).
> 
> This PR is a combination JDK-8233743 + JDK-8242449.
> 
> Testing: tier1, tier2 (aarch64).

This is a complex and fairly high-risk backport for a stable release. I don't think it's appropriate for this stage of the JDK 11 life cycle.

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PR: https://git.openjdk.java.net/jdk11u-dev/pull/137