RFR(XS): 8245714: "Bad graph detected in build_loop_late" when loads are pinned on loop limit check uncommon branch

[Tobias Hartmann]

Hi Roland,

looks good and trivial to me.

Best regards,
Tobias

On 25.05.20 11:11, Roland Westrelin wrote:
> 
> https://bugs.openjdk.java.net/browse/JDK-8245714
> http://cr.openjdk.java.net/~roland/8245714/webrev.00/
> 
> This triggers when data nodes are pinned on the uncommon trap path of a
> predicate. When a new predicate is added, a region is created to merge
> the paths comming from the place holder and the new predicate. Data
> nodes pinned on the uncommon path for the place holder are then updated
> to be pinned on the new region. That logic updates the control edge but
> not the control that loop opts keep track of. This causes a crash with
> the test case of the webrev where the predicate is a loop limit check.
> 
> Roland.
>