Hotspot loves PHP.reboot

[Rémi Forax]

On 09/06/2011 07:33 PM, Christian Thalinger wrote:
> On Sep 6, 2011, at 5:51 PM, Charles Oliver Nutter wrote:
>
>> On Tue, Sep 6, 2011 at 10:39 AM, Rémi Forax<forax at univ-mlv.fr>  wrote:
>>> Yes, but don't forget that PHP.reboot has no overflow check.
>> Did we ever figure out if it's possible to trick Hotspot into doing a
>> JO instead of the raw bit-level operations? John/Christian/Tom: what
>> would it take to get HS to "know" that we're doing an integer
>> overflow-after-maths check and do the (faster?) JO?
> We already talked a bit about that some while ago.  I think matching that double-xor-trick (or whatever it's called) is too risky.  A JDK method that does the check (and the math?) would be nice so we can intrinsify it.  GWT would fit here.
>
> Btw. what means JO?

jump on overflow, i guess.

>
> -- Christian

Rémi