RFR: JDK-8216437 : PPC64: Add intrinsic for GHASH algorithm [v12]

[Martin Doerr]

On Thu, 23 Jan 2025 16:46:27 GMT, Suchismith Roy <sroy at openjdk.org> wrote:

>> JBS Issue : [JDK-8216437](https://bugs.openjdk.org/browse/JDK-8216437)
>> 
>> Currently acceleration code for GHASH is missing for PPC64. 
>> 
>> The current implementation utlilises SIMD instructions on Power and uses Karatsuba multiplication for obtaining the final result.
>
> Suchismith Roy has updated the pull request incrementally with one additional commit since the last revision:
> 
>   indentation

There are test failures:
- compiler/codegen/aes/TestAESMain.java
- com/sun/crypto/provider/Cipher/AES/TestCopySafe.java
- many jdk tier2 http and ssl tests

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

PR Comment: https://git.openjdk.org/jdk/pull/20235#issuecomment-2612304487