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

[Dean Long]

On Wed, 17 Apr 2024 12:35:54 GMT, Yudi Zheng <yzheng at openjdk.org> wrote:

>> Moving array construction within BigInteger.implMultiplyToLen intrinsic candidate to its caller simplifies the intrinsic implementation in JIT compiler.
>
> Yudi Zheng has updated the pull request incrementally with one additional commit since the last revision:
> 
>   address comment.

src/hotspot/cpu/x86/macroAssembler_x86.cpp line 6662:

> 6660:   push(tmp5);
> 6661: 
> 6662:   push(xlen);

There may be an opportunity here (separate RFE?) to get rid of the save/restore for these.  I don't think it's necessary if this is called as part of a C2 stub.

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PR Review Comment: https://git.openjdk.org/jdk/pull/18226#discussion_r1569452818