jdk11u: Question about the likelihood of backporting SVE support

[Xiaolin Zheng]

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#L240-L243
[3] https://github.com/openjdk/jdk/blob/master/src/hotspot/cpu/riscv/stubGenerator_riscv.cpp#L944-L948
[4] https://github.com/openjdk/jdk/blob/master/src/hotspot/cpu/riscv/riscv_v.ad#L1932-L1949