RFR: 8287139: aarch64 intrinsic for unsignedMultiplyHigh

[Raffaello Giulietti]

On Mon, 23 May 2022 14:28:00 GMT, Bhavana-Kilambi <duke at openjdk.java.net> wrote:

>> I didn't run the benchmark.
>> Isn't a single instruction supposed to be faster anyway, as opposed to the java method?
>
> Hi, I tried the JMH benchmark with this patch, it does generate the "umulh" instruction instead of smulh.

Thanks @Bhavana-Kilambi, as the `hsdis` output above shows, this is indeed the case.

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PR: https://git.openjdk.java.net/jdk/pull/8840