RFR: 8343600: RISC-V: enable CRC32 intrinsic when either Zba or RVV are supported

[Fei Yang]

On Tue, 5 Nov 2024 09:44:21 GMT, Hamlin Li <mli at openjdk.org> wrote:

> Hi,
> Can you help to review this patch?
> 
> There were 2 intrinsic optimizations, scalar one and vector one, 
> * plain scalar one optimizes cases when data size is small, scalar one with zba optimizes cases when data size is big;
> * vector one optimizes cases when data size is big (better than scalar one with zba).
> 
> With RVV supported, when the size is small it will go to scalar code path, when the size is big it will go to RVV path then scalar path, so that means the RVV itself are sufficient enough to enable the intrinsic even without Zba supported.
> 
> Thanks!

The previous `UseZba` check seems a bit strange to me. I will retry to see if it's necessary.

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PR Review: https://git.openjdk.org/jdk/pull/21897#pullrequestreview-2415196589