RFR: 8324124: RISC-V: implement _vectorizedMismatch intrinsic [v6]

[Fei Yang]

On Tue, 12 Aug 2025 19:54:14 GMT, Yuri Gaevsky <duke at openjdk.org> wrote:

>> Hello All,
>> 
>> Please review these changes to enable the __vectorizedMismatch_ intrinsic on RISC-V platform with RVV instructions supported.
>> 
>> Thank you,
>> -Yuri Gaevsky
>> 
>> **Correctness checks:**
>>   hotspot/jtreg/compiler/{intrinsic/c1/c2}/ under QEMU-8.1 with RVV v1.0.0 and -XX:TieredStopAtLevel=1/2/3/4.
>
> Yuri Gaevsky has updated the pull request incrementally with one additional commit since the last revision:
> 
>   removed unneeded check for zero length; changed lmul from m8 to m2.

Not sure if I understand it correctly, but from your JMH numbers seems we are using more `ns` for each `op` with UseRVV?
I see the unit of the numbers is `ns/op`.

-------------

PR Comment: https://git.openjdk.org/jdk/pull/17750#issuecomment-3187438856