Safepoints at backward branches in c2

[Tom Rodriguez]

That's correct.  There are also various optimizations that later remove 
redundant ones to reduce the overhead.

tom

Jonathan Springer wrote:
> Gary Benson wrote:
>> Hi all,
>>
>> I've been looking through the c2 code and I noticed that safepoint
>> checks are inserted before backward branches but not forward branches.
>> Why is this?
> 
> I believe that safepoints should be executed within a bounded amount
> of computation.  Placing them at all backwards branches (and calls)
> guarantees that there are no loops without at least one safepoint.
> 
> Regards,
> -Jonathan
>