RFR: 8343689: AArch64: Optimize MulReduction implementation [v5]

[Mikhail Ablakatov]

On Wed, 2 Jul 2025 03:28:10 GMT, Hao Sun <haosun at openjdk.org> wrote:

>> Mikhail Ablakatov has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   fixup: remove undefined insts from aarch64-asmtest.py
>
> test/hotspot/jtreg/compiler/loopopts/superword/TestVectorFPReduction.java line 2:
> 
>> 1: /*
>> 2:  * Copyright (c) 2025, Arm Limited. All rights reserved.
> 
> `XX, YY,` means this file was created at XX year and the latest update was made at YY year. If `XX=YY`, then use `XX,`.
> 
> Suggestion:
> 
>  * Copyright (c) 2024, 2025, Arm Limited. All rights reserved.

Thank you for catching this!

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PR Review Comment: https://git.openjdk.org/jdk/pull/23181#discussion_r2179486265