Integrated: 8258932: AArch64: Enhance floating-point Min/MaxReductionV with fminp/fmaxp

[Dong Bo]

On Mon, 4 Jan 2021 06:23:33 GMT, Dong Bo <dongbo at openjdk.org> wrote:

> This patch optimizes vectorial Min/Max reduction of two floating-point numbers on aarch64 with NEON instructions `fmaxp` and `fminp`.
> 
> Passed jtreg tier1-3 tests with `linux-aarch64-server-fastdebug` build.
> Tests under `test/jdk/jdk/incubator/vector/` runned specially for the correctness and passed.
> 
> Introduced a new JMH micro `test/micro/org/openjdk/bench/vm/compiler/VectorReductionFloatingMinMax.java` for performance test.
> Witnessed abount `37%` performance improvements on Kunpeng916. The JMH Results:
> Benchmark                (COUNT)  (seed)  Mode  Cnt    Score   Error  Units
> # Kunpeng 916, default
> VectorReduction.maxRedD      512       0  avgt   10  678.126 ± 0.815  ns/op
> VectorReduction.maxRedF      512       0  avgt   10  242.958 ± 0.212  ns/op
> VectorReduction.minRedD      512       0  avgt   10  678.554 ± 0.824  ns/op
> VectorReduction.minRedF      512       0  avgt   10  243.368 ± 0.205  ns/op
> 
> # Kunpeng 916, with fmaxp/fminp
> VectorReduction.maxRedD      512       0  avgt   10  430.201 ± 0.353  ns/op => 36.56%
> VectorReduction.maxRedF      512       0  avgt   10  243.404 ± 0.297  ns/op
> VectorReduction.minRedD      512       0  avgt   10  427.805 ± 0.528  ns/op => 36.89%
> VectorReduction.minRedF      512       0  avgt   10  242.963 ± 0.210  ns/op

This pull request has now been integrated.

Changeset: ccac7aae
Author:    Dong Bo <dongbo at openjdk.org>
Committer: Fei Yang <fyang at openjdk.org>
URL:       https://git.openjdk.java.net/jdk/commit/ccac7aae
Stats:     658 lines in 7 files changed: 226 ins; 93 del; 339 mod

8258932: AArch64: Enhance floating-point Min/MaxReductionV with fminp/fmaxp

Reviewed-by: aph

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PR: https://git.openjdk.java.net/jdk/pull/1925