RFR: 8046943: RSA Acceleration

Anthony Scarpino anthony.scarpino at oracle.com
Thu Jun 18 17:00:38 UTC 2015

On 06/16/2015 07:33 AM, Andrew Haley wrote:
> On 06/15/2015 05:58 PM, Andrew Haley wrote:
>>>> 3.  I fused squaring and multiplication into a single
>>>>>> montgomeryMultiply method.  ...
>>>> I don't agree with fusing them together.  I think there should two
>>>> separate intrinsics.  For one, SPARC has a montsqr and montmul
>>>> instructions.  Additionally if someone wants to call montgomerySquare,
>>>> they should be able to call it directly with it's needed number of
>>>> arguments and not pass 'a' twice to satisfy an internal if().
>> OK, fair enough.  I'll think a little more about the best way to do
>> this.
> Done thusly.  The only thing I had any doubt about was whether to use a
> single flag for squaring and multiplication.  This patch uses separate
> flags.
> http://cr.openjdk.java.net/~aph/8046943-hs-2/
> http://cr.openjdk.java.net/~aph/8046943-jdk-2/
> Andrew.

I'm happy with the jdk change.. thanks..

Question, on the hotspot side you said in a previous post this was 
C2-only.  Was there a reason you don't have it for all?  Personally I'd 
enable it for all unless there was a performance hit in a particular mode.


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