The vector implementation for JavaFastPFOR is slower than the scalar one.

[XSAM]

Benchmark result

Benchmark                                         Mode  Cnt    Score   Error  Units
IntCompressionBench.fastPFORCompression          thrpt   12  210.045 ± 4.269  ops/s
IntCompressionBench.fastPFORDecompression        thrpt   12  621.802 ± 6.700  ops/s
IntCompressionBench.vectorFastPFORCompression    thrpt   12   87.594 ± 0.363  ops/s
IntCompressionBench.vectorFastPFORDecompression  thrpt   12  165.013 ± 4.739  ops/s

How to reproduce

Follow https://github.com/mulugetam/VectorJavaFastPFOR/tree/main/jmh

Run

numactl -m 0 -C 2 java --add-modules jdk.incubator.vector -jar target/benchmarks.jar IntCompressionBench

Environment

AWS m5.xlarge, ubuntu-22.04
JDK 19.0.1
Gradle URL: https://services.gradle.org/distributions-snapshots/gradle-7.6-20220924231105+0000-bin.zip

[lemire]

What is your hardware?

[XSAM]

AWS EC2 m5.xlarge