RFR: 8322768: Optimize non-subword vector compress and expand APIs for AVX2 target. [v9]

[Jatin Bhateja]

> Hi,
> 
> Patch optimizes non-subword vector compress and expand APIs for x86 AVX2 only targets.
> Upcoming E-core Xeons (Sierra Forest) and Hybrid CPUs only support AVX2 instruction set.
> These are very frequently used APIs in columnar database filter operation.
> 
> Implementation uses a lookup table to record permute indices. Table index is computed using
> mask argument of compress/expand operation.
> 
> Following are the performance number of JMH micro included with the patch.
> 
> 
> System : Intel(R) Xeon(R) Platinum 8480+ (Sapphire Rapids)
> 
> Baseline:
> Benchmark                                 (size)   Mode  Cnt    Score   Error   Units
> ColumnFilterBenchmark.filterDoubleColumn    1024  thrpt    2  142.767          ops/ms
> ColumnFilterBenchmark.filterDoubleColumn    2047  thrpt    2   71.436          ops/ms
> ColumnFilterBenchmark.filterDoubleColumn    4096  thrpt    2   35.992          ops/ms
> ColumnFilterBenchmark.filterFloatColumn     1024  thrpt    2  182.151          ops/ms
> ColumnFilterBenchmark.filterFloatColumn     2047  thrpt    2   91.096          ops/ms
> ColumnFilterBenchmark.filterFloatColumn     4096  thrpt    2   44.757          ops/ms
> ColumnFilterBenchmark.filterIntColumn       1024  thrpt    2  184.099          ops/ms
> ColumnFilterBenchmark.filterIntColumn       2047  thrpt    2   91.981          ops/ms
> ColumnFilterBenchmark.filterIntColumn       4096  thrpt    2   45.170          ops/ms
> ColumnFilterBenchmark.filterLongColumn      1024  thrpt    2  148.017          ops/ms
> ColumnFilterBenchmark.filterLongColumn      2047  thrpt    2   73.516          ops/ms
> ColumnFilterBenchmark.filterLongColumn      4096  thrpt    2   36.844          ops/ms
> 
> Withopt:
> Benchmark                                 (size)   Mode  Cnt     Score   Error   Units
> ColumnFilterBenchmark.filterDoubleColumn    1024  thrpt    2  2051.707          ops/ms
> ColumnFilterBenchmark.filterDoubleColumn    2047  thrpt    2   914.072          ops/ms
> ColumnFilterBenchmark.filterDoubleColumn    4096  thrpt    2   489.898          ops/ms
> ColumnFilterBenchmark.filterFloatColumn     1024  thrpt    2  5324.195          ops/ms
> ColumnFilterBenchmark.filterFloatColumn     2047  thrpt    2  2587.229          ops/ms
> ColumnFilterBenchmark.filterFloatColumn     4096  thrpt    2  1278.665          ops/ms
> ColumnFilterBenchmark.filterIntColumn       1024  thrpt    2  4149.384          ops/ms
> ColumnFilterBenchmark.filterIntColumn       2047  thrpt    2  1791.170          ops/ms
> ColumnFilterBenchmark.filterIntColumn       4096...

Jatin Bhateja has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 10 additional commits since the last revision:

 - Merge branch 'master' of http://github.com/openjdk/jdk into JDK-8322768
 - Modifying comments.
 - Review comments resolution
 - Modified code comment for clarity.
 - Space fixup
 - Using emulated variable blend E-Core optimized instruction.
 - Review suggestions incorporated.
 - Review comments resolutions.
 - Updating copyright year of modified files.
 - 8322768: Optimize non-subword vector compress and expand APIs for AVX2 target.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/17261/files
  - new: https://git.openjdk.org/jdk/pull/17261/files/cd912308..83e4065e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17261&range=08
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17261&range=07-08

  Stats: 41105 lines in 1072 files changed: 24738 ins; 11390 del; 4977 mod
  Patch: https://git.openjdk.org/jdk/pull/17261.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17261/head:pull/17261

PR: https://git.openjdk.org/jdk/pull/17261