RFR(L): 8205044: [lworld] Interpreter and compiler support for acmp with value type operands

[Ioi Lam]

Hi Tobias,

I looked at the interpreter part of the change. I think it correctly 
implements the perturbation technique as described in [1].

Thanks

- Ioi

[1] 
http://mail.openjdk.java.net/pipermail/valhalla-dev/2018-January/003722.html


On 7/10/18 7:01 AM, Tobias Hartmann wrote:
> Hi,
>
> please review the following patch:
> https://bugs.openjdk.java.net/browse/JDK-8205044
> http://cr.openjdk.java.net/~thartmann/8205044/webrev.00/
>
> I've ported this code from the Exp branch [1]. We therefore still use the klass pointer alignment
> trick to determine if an oop points to a value type. We can later enhance this to use the mark word.
>
> Thanks,
> Tobias
>
> [1]
> http://mail.openjdk.java.net/pipermail/valhalla-dev/2018-March/003935.html
> http://mail.openjdk.java.net/pipermail/valhalla-dev/2018-February/003824.html