RFR: 8364184: [REDO] AArch64: [VectorAPI] sve vector math operations are not supported after JDK-8353217

[Fei Gao]

On Mon, 4 Aug 2025 14:52:14 GMT, Andrew Haley <aph at openjdk.org> wrote:

>>> Can we link this with a GCC bug report?
>> 
>> @theRealAph thanks for taking a look at this. It looks like there have already been a few related discussions. The feature author mentioned that there are no current plans to support VLAs. See the discussion in [GCC Bug 103374](https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103374), and a newer one in [GCC Bug 119381](https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119381). Are you suggesting that we should open a new report?
>
>> > Can we link this with a GCC bug report?
>> 
>> @theRealAph thanks for taking a look at this. It looks like there have already been a few related discussions. The feature author mentioned that there are no current plans to support VLAs. See the discussion in [GCC Bug 103374](https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103374), and a newer one in [GCC Bug 119381](https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119381). Are you suggesting that we should open a new report?
> 
> I'm trying to understand if this is a bug in GCC. It appears that it is: `-ftrivial-auto-var-init=pattern` is incompatible with opaque sizeless types in ARM C Language Extensions (ACLE). There is no workaround for it.
> 
> So, this patch is reasonable, but please submit a GCC bug report of "`-ftrivial-auto-var-init=pattern` is incompatible with opaque sizeless types in ARM C Language Extensions (ACLE)." Otherwise GCC authors won't know. This might encourage Jakub to fix `-ftrivial-auto-var-init=pattern` .

Thanks for approving it @theRealAph @magicus .

I'll integrate it.

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PR Comment: https://git.openjdk.org/jdk/pull/26577#issuecomment-3205824114