[aarch64-port-dev ] RFR: 8129426: aarch64: add support for PopCount in C2

[Edward Nevill]

On Tue, 2015-06-23 at 11:32 +0100, Andrew Dinn wrote:
> On 23/06/15 11:10, Andrew Haley wrote:
> > On 22/06/15 17:14, Andrew Dinn wrote:
> >> . . .
> >> Well, you might not want to take this risk and instead add an explicit
> >> zero of the upper half. But I think we need to be clear what risk we are
> >> taking.
> > 
> > It's this: if we don't explicitly zero the upper half we'll have to
> > audit all the code which might present a sign-extended value (instead
> > of a zero-extended one) in a register that's supposed to contain a
> > jint.
> 
> Ok, let's play safe. If Ed tweaks the patch to zero the upper word we
> can always revise that later if/when we decide we are feeling lucky.
> 

OK. New webrev at

http://cr.openjdk.java.net/~enevill/8129426/webrev.02/

All the best,
Ed.