RFR: 8277793: Support vector F2I and D2L cast operations for X86 [v4]

[Paul Sandoz]

On Wed, 1 Dec 2021 18:06:58 GMT, Jatin Bhateja <jbhateja at openjdk.org> wrote:

>> - JDK-8275317 extended auto-vectorizer to infer Vector Cast operations if source and destination primitive type have same size.
>> - This patch adds the backend support for vector CastF2I and CaseD2L on X86 AVX512 and legacy targets.
>> 
>> Following are the performance measurements of an existing JMH benchmark (test/micro/org/openjdk/bench/vm/compiler/TypeVectorOperations.java)
>> 
>> System Configuration :  Intel(R) Xeon(R) Platinum 8380 CPU @ 2.30GHz (40C 2S Icelake Server)
>> 
>> BENCHMARK | SIZE | BASELINE (AVX3) ns/op | WithOpt (AVX3) ns/op | Gain AVX3(baseline/opt) | BASELINE (AVX2) ns/op | WithOpt (AVX2) ns/op | Gain AVX2 (baseline/opt)
>> -- | -- | -- | -- | -- | -- | -- | --
>> TypeVectorOperations.TypeVectorOperationsSuperWord.convert_d2l | 512.00 | 256.26 | 77.50 | 3.31 | 275.49 | 275.65 | 1.00
>> TypeVectorOperations.TypeVectorOperationsSuperWord.convert_d2l | 1024.00 | 501.87 | 150.35 | 3.34 | 540.47 | 541.22 | 1.00
>> TypeVectorOperations.TypeVectorOperationsSuperWord.convert_d2l | 2048.00 | 993.05 | 293.23 | 3.39 | 1070.56 | 1070.14 | 1.00
>> TypeVectorOperations.TypeVectorOperationsSuperWord.convert_f2i | 512.00 | 227.83 | 39.36 | 5.79 | 248.25 | 45.01 | 5.52
>> TypeVectorOperations.TypeVectorOperationsSuperWord.convert_f2i | 1024.00 | 449.70 | 77.88 | 5.77 | 487.33 | 86.15 | 5.66
>> TypeVectorOperations.TypeVectorOperationsSuperWord.convert_f2i | 2048.00 | 884.95 | 149.58 | 5.92 | 956.58 | 152.45 | 6.27
>> 
>> Kindly review and share your feedback.
>> 
>> Best Regards,
>> Jatin
>
> Jatin Bhateja has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8277793: Review comments resolution.

Tests pass.

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PR: https://git.openjdk.java.net/jdk/pull/6544