Safepoints at backward branches in c2

[Jonathan Springer]

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

-- 
Jonathan Springer     |
Reservoir Labs, Inc.  |  http://www.reservoir.com/