hg: jdk/jdk14: 8235984: C2: assert(out->in(PhiNode::Region) == head || out->in(PhiNode::Region) == slow_head) failed: phi must be either part of the slow or the fast loop

[tobias.hartmann at oracle.com]

Changeset: b567c4b48777
Author:    chagedorn
Date:      2020-01-07 17:06 +0100
URL:       https://hg.openjdk.java.net/jdk/jdk14/rev/b567c4b48777

8235984: C2: assert(out->in(PhiNode::Region) == head || out->in(PhiNode::Region) == slow_head) failed: phi must be either part of the slow or the fast loop
Summary: Bailout from loop unswitching if loop predicates have a control dependency to partially peeled statements.
Reviewed-by: neliasso, thartmann

! src/hotspot/share/opto/loopUnswitch.cpp
! test/hotspot/jtreg/compiler/loopopts/PartialPeelingUnswitch.java