Strict long type casting

[Ty Young]

On 4/7/20 3:54 PM, Maurizio Cimadamore wrote:
>
> On 07/04/2020 20:38, Ty Young wrote:
>> Question: can the JIT compiler still perform these optimizations if 
>> the VarHandle(s) are stored in a Map so long as the references are 
>> final? Currently(as shown in the code), I'm doing just that to cut 
>> down on the amount of wasted memory on the exact same VarHandle(s) as 
>> I'd otherwise have 60+ instances. 
>
> I would expect a Map to obfuscate things too much for the JIT. Rather 
> than having a Map, if you care about performances, I'd suggest to just 
> declare all the common (final static) constants you need somewhere - 
> and fetch them from that single place. That's at least how code 
> typically operate with MethodHandle and VarHandle.
>
> Even storing them into arrays is not great in the absence of the 
> @Stable annotation (which is only available to JDK code).


Thanks for the clarification. Is there any chance for this being done on 
FMA's end?


>
> Maurizio
>