RFR: 8343689: AArch64: Optimize MulReduction implementation [v8]

[Andrew Haley]

On Fri, 11 Jul 2025 08:11:30 GMT, Andrew Haley <aph at openjdk.org> wrote:

>> Mikhail Ablakatov has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   remove the strictly-ordered FP implementation as unused
>
> src/hotspot/cpu/aarch64/assembler_aarch64.hpp line 4073:
> 
>> 4071:     f(0b101111, 15, 10), rf(Zn, 5), rf(Zd, 0);
>> 4072:   }
>> 4073: 
> 
> This pattern should be in a section _SVE Integer Reduction_, C4.1.37. I'm not sure if any other instructions in that group are defined yet, but if not please start the section.

Sorry, the unpredicated version should be in the _SVE Integer Misc - Unpredicated_ section.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23181#discussion_r2200087303