RFR: 8280696: C2 compilation hits assert(is_dominator(c, n_ctrl)) failed

[Vladimir Kozlov]

On Wed, 18 May 2022 15:42:36 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

> That code was introduced by JDK-8231291. Maybe @rwestrel can comment on why it's necessary to create individual Phis for base and address.

Bug!!!:
https://github.com/openjdk/jdk/blob/master/src/hotspot/share/opto/cfgnode.cpp#L2168
should use `AddPNode::Base`:

        if (in(i)->in(AddPNode::Base) != base) {
          base = NULL;
        }

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PR: https://git.openjdk.java.net/jdk/pull/8770