[lworld] RFR: 8263067: [lworld] Use tlab_allocate in MacroAssembler::store_inline_type_fields_to_buf

[Tobias Hartmann]

On Fri, 5 Mar 2021 07:53:40 GMT, Yi Yang <github.com+5010047+kelthuzadx at openjdk.org> wrote:

>> Hi Yang,
>> 
>> I had this on my To-Do list as well, thanks for fixing! I'm just wondering if we shouldn't also attempt an allocation in eden if `UseTLAB` is disabled? Similar to what code in `MacroAssembler::allocate_instance` does.
>> 
>> Thanks,
>> Tobias
>
> Hi Tobias,
> 
> I think it's reasonable. We can create such a buffered instance similar to `MacroAssembler::allocate_instance` or just using it. What do you think? If you think it's a feasible way, I can also try to tweak the implementation, keeping using the same buffer allocation mechanism on  aarch64.
> 
> Thanks!
> Yang

Yes, I think it would be nice to factor the common code out of `MacroAssembler::allocate_instance` (we don't need the zeroing and some of the checks) and use it for buffer allocation.

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PR: https://git.openjdk.java.net/valhalla/pull/362