RFR(S): 8203215: IdealLoopTree::split_outer_loop leaves phi-nodes with only one input

[Nils Eliasson]

Thank you, Rickard!


On 2018-05-15 12:39, Rickard Bäckman wrote:
> Looks good to me.
>
> /R
>
> On 05/15, Nils Eliasson wrote:
>> Hi,
>>
>> I ran into an issue in the ZGC repo caused by optimizations encountering
>> loop-phi-nodes having only one input. I tracked down the source of these to
>> IdealLoopTree::split_outer_loop that is a part of beautify_loops.
>>
>> This patch makes sure that the phis that may need a transform is processed
>> after beautify_loops is completed, but before the loop tree is rebuilt.
>>
>> Bug: https://bugs.openjdk.java.net/browse/JDK-8203215
>>
>> Webrev: http://cr.openjdk.java.net/~neliasso/8203215/webrev.01/
>>
>> Please review,
>>
>> Nils
>>