RFR: 8327964: Simplify BigInteger.implMultiplyToLen intrinsic [v3]

[Yudi Zheng]

On Tue, 26 Mar 2024 15:59:33 GMT, Damon Fenacci <dfenacci at openjdk.org> wrote:

>> Yudi Zheng has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   address comment.
>
> `multiply_to_len` seems to be used by `generate_squareToLen` as well for aarch64 and riscv but `zlen` is still passed in a register.
> 
> https://github.com/openjdk/jdk/blob/870a6127cf54264c691f7322d775b202705c3bfa/src/hotspot/cpu/aarch64/stubGenerator_aarch64.cpp#L4710
> https://github.com/openjdk/jdk/blob/870a6127cf54264c691f7322d775b202705c3bfa/src/hotspot/cpu/riscv/stubGenerator_riscv.cpp#L2881
> 
> I think it might work anyway but it might be better to adapt them if only for completeness.

@dafedafe @dean-long please take a look and let me know if there are further issues, thanks!

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PR Comment: https://git.openjdk.org/jdk/pull/18226#issuecomment-2061162283