jdk11u: Question about the likelihood of backporting SVE support

[Владимир Кемпик]

Hello
Just few comments.
Vector extension version 1.0 is the only vector extension supported by
jdk19.
Currently its impossible to find any publicly available cpu/board with
support for Vector extension 1.0.

Basically it means the risc-v vector support in openjdk11 is something that
can wait few years. And maybe later maintainers will reconsider their
decision.

Regards, Vladimir

вт, 21 февр. 2023 г., 11:28 Xiaolin Zheng <yunyao.zxl at alibaba-inc.com>:

> Hi Goetz,
>
> Thank you for the response!
>
> Okay, we will follow the advice.
>
> Best Regards,
> Xiaolin
>
> ------------------------------------------------------------------
> From:Lindenmaier, Goetz <goetz.lindenmaier at sap.com>
> Send Time:2023年2月21日(星期二) 16:25
> To:郑孝林(云矅) <yunyao.zxl at alibaba-inc.com>; jdk-updates-dev <
> jdk-updates-dev at openjdk.org>; riscv-port-dev <
> riscv-port-dev-retn at openjdk.org>
> Subject:RE: jdk11u: Question about the likelihood of backporting SVE
> support
>
> Hi,
>
> I think this change should not be backported to 11.
>
> Best regards,
>   Goetz.
>
> > -----Original Message-----
> > From: jdk-updates-dev <jdk-updates-dev-retn at openjdk.org> On Behalf Of
> > Xiaolin Zheng
> > Sent: Tuesday, February 21, 2023 8:58 AM
> > To: jdk-updates-dev <jdk-updates-dev at openjdk.org>; riscv-port-dev
> <riscv-
> > port-dev-retn at openjdk.org>
> > Subject: jdk11u: Question about the likelihood of backporting SVE support
> >
> > [Some people who received this message don't often get email from
> > yunyao.zxl at alibaba-inc.com. Learn why this is important at
> > https://aka.ms/LearnAboutSenderIdentification ]
> >
> > Hi maintainers of jdk11u:
> >
> > I would like to ask if it is possible for the SVE support [1] to be
> backported to
> > jdk11u, for the maintainers' aspect. If the RISC-V backend is going to be
> > backported to jdk11u, then we will face an issue that the VecA
> implementation
> > [2] used by the backend does not exist on jdk11u. The general
> functionality of
> > the backend, and the shared vector intrinsics [3] defined in
> StubRoutines will
> > not get affected without VecA; though VectorAPI and vector intrinsic
> defined
> > in C2 [4] in riscv_v.ad may not work - if one would like to know the
> details.
> >
> > Looking forward to your reply.
> >
> > Best Regards,
> > Xiaolin
> >
> > [1] https://bugs.openjdk.org/browse/JDK-8231441
> > [2]
> >
> https://github.com/openjdk/jdk/blob/master/src/hotspot/cpu/riscv/riscv.ad#L
> > 240-L243
> > [3]
> >
> https://github.com/openjdk/jdk/blob/master/src/hotspot/cpu/riscv/stubGene
> > rator_riscv.cpp#L944-L948
> > [4]
> >
> https://github.com/openjdk/jdk/blob/master/src/hotspot/cpu/riscv/riscv_v.ad
> > #L1932-L1949
>
>
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