RFR(M): 8145913: PPC64: add Montgomery multiply intrinsic

[Andrew Haley]

On 28/12/15 17:45, Doerr, Martin wrote:

> However, this benchmark does not show any difference when changing
> MONTGOMERY_SQUARING_THRESHOLD.  Can you propose something else for
> tuning this?

It is possible that it doesn't make a difference, I suppose.  I am
rather surprised, but if it makes no difference then it doesn't
matter.

Andrew.