RFR: 8353735: [JVMCI] Allow specifying storage kind of the callee save register

Mon Apr 7 19:04:15 UTC 2025

On Fri, 4 Apr 2025 14:47:39 GMT, Yudi Zheng <yzheng at openjdk.org> wrote:

> Windows x64 ABI considers the upper portions of YMM0-YMM15 and ZMM0-ZMM15 volatile, that is, destroyed on function calls. This PR allows `RegisterConfig` implementations to refine the storage kind of callee save register, such that JVMCI compiler can exploit this information to avoid saving full width of these registers.

LGTM

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Marked as reviewed by cslucas (Author).

PR Review: https://git.openjdk.org/jdk/pull/24451#pullrequestreview-2747807421