Do we need an unsigned multiplyHigh?

Andrew Haley aph at
Tue Sep 26 08:31:42 UTC 2017

On 26/09/17 08:25, Peter Lawrey wrote:
> I am looking forward to intrinsic support for 128 bit math using ?Long2?
> and XMM (or even YMM, ZMM) instructions.
> This is the best way forward, I hope.
> Personally I would like to see a long long type, or even uint128, uint256,
> uint512 style notation.
> Another option might be something like long<128> or an annotation like
> @uint128 long or even @decimal128 double but who knows.

Do you actually need any of that?  I think vector types make more sense.
Java already has a great many scalar types.

Andrew Haley
Java Platform Lead Engineer
Red Hat UK Ltd. <>
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