RFR: 8327964: Simplify BigInteger.implMultiplyToLen intrinsic [v5]

[Dean Long]

On Wed, 17 Apr 2024 19:45:02 GMT, Dean Long <dlong at openjdk.org> wrote:

>> Yudi Zheng has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   address comment.
>
> src/hotspot/cpu/aarch64/stubGenerator_aarch64.cpp line 4702:
> 
>> 4700:     const Register tmp5  = r15;
>> 4701:     const Register tmp6  = r16;
>> 4702:     const Register tmp7  = r17;
> 
> No need for r17 or sorting tmps.  Make tmp0 r3, or r6, r7, etc.

Also, I don't see why the code below saves and restores r4/r5.  Maybe @theRealAph knows?  Aren't all these registers killed across a runtime call?

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/18226#discussion_r1569427241