RFR: 8271515: Integration of JEP 417: Vector API (Third Incubator) [v8]

[Nick Gasson]

On Thu, 4 Nov 2021 15:56:46 GMT, Paul Sandoz <psandoz at openjdk.org> wrote:

>> This PR improves the performance of vector operations that accept masks on architectures that support masking in hardware, specifically Intel AVX512 and ARM SVE.
>> 
>> On architectures that do not support masking in hardware the same technique as before is applied to most operations, specifically composition using blend.
>> 
>> Masked loads/stores are a special form of masked operation that require additional care to ensure out-of-bounds access throw exceptions. The range checking has not been fully optimized and will require further work.
>> 
>> No API enhancements were required and only a few additional tests were needed.
>
> Paul Sandoz has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Merge pull request #2 from nsjian/vector-conversion-fix
>    
>    AArch64: Incorrect SVE double to int and float to long vector conversion
>  - Incorrect double to int and float to long vector conversion
>    
>    Like JDK-8276151, SVE vector double to int and float to long
>    conversions have similar issue. According to Java language
>    specification [1], we should convert double/float to
>    integer/long directly, instead of converting to long/int and then
>    narrowing/extending to target types. Test cases will be updated in
>    JDK-8276151.
>    
>    [1] https://docs.oracle.com/javase/specs/jls/se17/html/jls-5.html#jls-5.1.3

Marked as reviewed by ngasson (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/5873