RFR: 8254369: Node::disconnect_inputs may skip precedences

[Vladimir Kozlov]

On Wed, 14 Oct 2020 23:32:31 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> 8254369: Node::disconnect_inputs may skip precedences
>
> src/hotspot/share/opto/node.cpp line 914:
> 
>> 912:   // Remove precedence edges if any exist
>> 913:   // Note: Safepoints may have precedence edges, even during parsing
>> 914:   for (uint i = len() - 1; i < len() && i >= req(); --i) {
> 
> i < len() check is not needed

I got now why you need to scan reverse.

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PR: https://git.openjdk.java.net/jdk/pull/664