RFR(S): 8200477: Integer dot product no longer autovectorised

[Vladimir Kozlov]

Seems fine. Fix comment too, please. I start testing.

did you verified that code is vectorized with your changes?

Thanks,
Vladimir

On 4/10/18 7:54 AM, Roland Westrelin wrote:
> 
> http://cr.openjdk.java.net/~roland/8200477/webrev.00/
> 
> Superword only allows reduction to have Phi uses but with loop strip
> mining, there's a safepoint use as well. In any case, the check for only
> Phi uses seems too strict to me. So I replaced it with a check for only
> uses out of loop.
> 
> Roland.
>