[jdk26] RFR: 8371603: C2: Missing Ideal optimizations for load and store vectors on SVE

[Xiaohong Gong]

On Wed, 10 Dec 2025 03:47:31 GMT, Xiaohong Gong <xgong at openjdk.org> wrote:

> Hi all,
> 
> This pull request contains a backport of commit [b6732d60](https://github.com/openjdk/jdk/commit/b6732d6048259de68a3dd5b4f66ac82f87270404) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.
> 
> The commit being backported was authored by Xiaohong Gong on 10 Dec 2025 and was reviewed by Emanuel Peter, Eric Fang and Hao Sun.
> 
> Thanks!

Tested locally with different SVE vector length (128-bit, 256-bit, 512-bit), and all tests pass.

Thanks for your review @eme64 and @erifan !

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PR Comment: https://git.openjdk.org/jdk/pull/28732#issuecomment-3639824152