RFR: 8275448: [REDO] AArch64: Implement string_compare intrinsic in SVE [v3]

[Andrew Haley]

On Thu, 11 Nov 2021 09:18:04 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

> > They are almost identical except the comparison in the stub code has been changed from "if (!UseSVE)" to "if (UseSVE == 0)". It doesn't mean that is the cause of these failures. The generated codes from Toolchains are different from patch to patch. They should be equivalent but as I'm not familiar macOS toolchain, this change can avoid unnecessary casting from `uint` to `bool`. Please see [UseSVE](https://github.com/openjdk/jdk/blob/673ce7efa56e7eb54266af6fe795d46d57f51bdc/src/hotspot/cpu/aarch64/globals_aarch64.hpp#L101)
> 
> I undid that change and re-executed testing. No failures. Integrating this again without knowing the root cause of the previous failures is a bit concerning.

True, but there never was much chance that this change directly caused the failures. My money is still on a toolchain problem.

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PR: https://git.openjdk.java.net/jdk/pull/6072