RFR: AArch64 fixes to C1 SFX barriers

[Aleksey Shipilev]

On 8/15/19 1:10 PM, Roman Kennke wrote:
>>> http://cr.openjdk.java.net/~rkennke/c1-sfx-aarch64/webrev.00/
>>
>> Hm, it is awkward to have arch-specific hacks in shared code. This is okay for staging/testing code,
>> but we would need to find a cleaner solution for upstream. Maybe fix LIR_Assembler::leal in aarch64?
> 
> We could (without touching leal):
> 
> - Do ensure_in_register() in aarch-specific
> shenandoahBarrierSetC1_XXX.cpp and involve a little bit of code-duplication
> 
> or
> 
> - Extract generating of register into, say, new_register_for_lea() and
> do that in aarch64-specific shenandoahBarrierSetC1_XXX.cpp and keep the
> majority of ensure_in_register() in shared.

Maybe? We can see as we go prepare for upstreaming.

-- 
Thanks,
-Aleksey