[aarch64-port-dev ] RFR: 8144993: Elide redundant memory barrier after AllocationNode

[Vitaly Davidovich]

Hotspot implements only the scalar replacement form of EA.

On Tue, Dec 15, 2015 at 9:33 AM, Andrew Haley <aph at redhat.com> wrote:

> On 12/15/2015 02:28 PM, Vitaly Davidovich wrote:
> > I'm curious why you guys think `a` and/or `b` would be in the oopmap if
> > compiler proves they don't escape.  AFAIK, both `a` and `b` will be
> > component-wise scalar replaced.  Once that's done, there's a ref from
> > scalar replaced a.x to `b`, but `b` itself is scalar replaced.  In either
> > case, I don't see why either of these need to be known to GC at all
> (which
> > would somewhat defeat the purpose of EA to begin with).
>
> Are you saying that if escape analysis determined that an object does
> not escape then you know *for sure* that it will always be scalar-
> replaced?
>
> Andrew.
>
>