[jdk18] RFR: 8281713: [BACKOUT] AArch64: Implement string_compare intrinsic in SVE

[Vladimir Kozlov]

On Mon, 14 Feb 2022 10:30:09 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

> We observed several failures on macosx aarch64 after integration of [JDK-8275448](https://bugs.openjdk.java.net/browse/JDK-8275448). I could reliably reproduce [JDK-8281512](https://bugs.openjdk.java.net/browse/JDK-8281512) with JDK 18 b25-1665 (the first build with [JDK-8275448](https://bugs.openjdk.java.net/browse/JDK-8275448) containing no other changes) but **not** with JDK 18 b25-1664 (the build just before integration). Also, I could reliably reproduce the issue with mainline but **not** with the string compare intrinsic disabled. I think this is enough evidence to prove that [JDK-8275448](https://bugs.openjdk.java.net/browse/JDK-8275448) is the root cause of the failures.
> 
> Given that we don't fully understand which part of this fix is causing the issue and how (it might be a side effect that triggers a bug in the build toolchain or adlc), I propose to backout the change. The backout applies cleanly, approval is pending.
> 
> Thanks,
> Tobias

Good.

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Marked as reviewed by kvn (Reviewer).

PR: https://git.openjdk.java.net/jdk18/pull/116