RFR: 8282875: AArch64: [vectorapi] Optimize Vector.reduceLane for SVE 64/128 vector size

[Eric Liu]

On Wed, 30 Mar 2022 13:33:20 GMT, Andrew Haley <aph at openjdk.org> wrote:

> Please include the benchmarks in this patch.

We tested with the benchmarks in the vectorIntrinsics branch of openjdk/panama-vector, e.g, Byte128Vector.ADDLanes[1], Byte128Vector.MINLanes[2], Byte128Vector.MAXLanes[3], Byte128Vector.MULLanes[4]. Currently they are not in JDK main-line. I'm not sure if it's necessary to rewrite the same code for this tests in this patch.

[1] https://github.com/openjdk/panama-vector/blob/vectorIntrinsics/test/micro/org/openjdk/bench/jdk/incubator/vector/operation/Byte128Vector.java#L1022
[2] https://github.com/openjdk/panama-vector/blob/vectorIntrinsics/test/micro/org/openjdk/bench/jdk/incubator/vector/operation/Byte128Vector.java#L1086
[3] https://github.com/openjdk/panama-vector/blob/vectorIntrinsics/test/micro/org/openjdk/bench/jdk/incubator/vector/operation/Byte128Vector.java#L1118
[4] https://github.com/openjdk/panama-vector/blob/vectorIntrinsics/test/micro/org/openjdk/bench/jdk/incubator/vector/operation/Byte128Vector.java#L1054

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PR: https://git.openjdk.java.net/jdk/pull/7999