Integrated: 8261542: X86 slice and unslice intrinsics for 256-bit byte/short vectors

[Sandhya Viswanathan]

On Thu, 11 Feb 2021 02:37:35 GMT, Sandhya Viswanathan <sviswanathan at openjdk.org> wrote:

> The slice and unslice intrinsics for 256-bit byte/short vectors can be implemented for x86 platforms supporting AVX2 using a sequence of instructions.
> 
> JBS: https://bugs.openjdk.java.net/browse/JDK-8261542
> 
> The PerfSliceOrigin.java jmh test attached to the JBS shows the following performance on AVX2 platform.
> 
> Before:
> Benchmark                                 (size)   Mode  Cnt   Score   Error   Units
> PerfSliceOrigin.vectorSliceOrigin           1024  thrpt    5  18.887 ± 1.128  ops/ms
> PerfSliceOrigin.vectorSliceUnsliceOrigin    1024  thrpt    5   9.374 ± 0.370  ops/ms
> 
> After:
> Benchmark                                 (size)   Mode  Cnt      Score     Error   Units
> PerfSliceOrigin.vectorSliceOrigin           1024  thrpt    5  13861.420 ±  19.071  ops/ms
> PerfSliceOrigin.vectorSliceUnsliceOrigin    1024  thrpt    5   7895.199 ± 142.580  ops/ms

This pull request has now been integrated.

Changeset: c53acc2a
Author:    Sandhya Viswanathan <sviswanathan at openjdk.org>
URL:       https://git.openjdk.java.net/jdk/commit/c53acc2a
Stats:     120 lines in 7 files changed: 100 ins; 5 del; 15 mod

8261542: X86 slice and unslice intrinsics for 256-bit byte/short vectors

Reviewed-by: kvn, neliasso

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PR: https://git.openjdk.java.net/jdk/pull/2520