RFR: 8283667: [vectorapi] Vectorization for masked load with IOOBE with predicate feature [v3]

[Xiaohong Gong]

On Thu, 12 May 2022 16:07:54 GMT, Paul Sandoz <psandoz at openjdk.org> wrote:

>> Xiaohong Gong has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Rename "use_predicate" to "needs_predicate"
>
> Yes, the tests were run in debug mode. The reporting of the missing constant occurs for the compiled method that is called from the method where the constants are declared e.g.:
> 
>     719  240    b        jdk.incubator.vector.Int256Vector::fromArray0 (15 bytes)
>   ** Rejected vector op (LoadVectorMasked,int,8) because architecture does not support it
>   ** missing constant: offsetInRange=Parm
>                             @ 11   jdk.incubator.vector.IntVector::fromArray0Template (22 bytes)   force inline by annotation
> 
> 
> So it appears to be working as expected. A similar pattern occurs at a lower-level for the passing of the mask class. `Int256Vector::fromArray0` passes a constant class to `IntVector::fromArray0Template` (the compilation of which bails out before checking that the `offsetInRange` is constant).

You are right @PaulSandoz ! I ran the tests and benchmarks with your patch, and no failure and performance regression are found. I will update the patch soon. Thanks for the help!

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

PR: https://git.openjdk.java.net/jdk/pull/8035