RFR: 8355216: Accelerate P-256 arithmetic on aarch64 [v2]

[Ben Perez]

On Tue, 2 Dec 2025 10:08:11 GMT, Andrew Haley <aph at openjdk.org> wrote:

>> Ben Perez has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fixed typo
>
> src/hotspot/cpu/aarch64/assembler_aarch64.hpp line 3194:
> 
>> 3192:     _umullv(Vd, Ta, Vn, Tb, Vm, Ts, lane);
>> 3193:   }
>> 3194: 
> 
> These seem to be essentially identical except for one assertion.
> 
> Suggestion: as elsewhere in class Assembler,` #define INSN` for the common pattern, then use it.

I used this format to mirror `pmull{2}` which has a similar structure. Open to changing to the `INSN` format if that's better though

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PR Review Comment: https://git.openjdk.org/jdk/pull/27946#discussion_r2819104362