RFR: 8312425: [vectorapi] AArch64: Optimize vector math operations with SLEEF [v4]

[Hamlin Li]

On Fri, 22 Mar 2024 12:42:04 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> > Ah, it'll only be the redirect library that's compiled with -march=armv8-a+sve Forget that.
> 
> But that raises an interesting question. What happens if you try to load a library compiled with `-march=armv8-a+sve` on a non-SVE system? Is the ELF flagged to require SVE so it will fail to load? I'm hoping this is the case -- if so, everything will work as it should in this PR, but I honestly don't know. (After spending like 10 years working with building, I still discover things I need to learn...).

I think we can handle it, when a jdk built with sve support runs on a non-sve machine, the sve related code will not be executed with the protection of UseSVE vm flag which is detected at runtime startup.

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PR Comment: https://git.openjdk.org/jdk/pull/18294#issuecomment-2015348458