[JIT] Fix a deadloop in c2 compiler

dragonwell-project / dragonwell8

Alibaba Dragonwell8 JDK

http://dragonwell-jdk.io

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[JIT] Fix a deadloop in c2 compiler #456

Closed D-D-H closed 1 year ago

D-D-H commented 1 year ago

Summary: A dead loop was observed in C2 optimizations. This deadloop is very rare and hard to reproduce. A conservative way is used to fix this issue. If a dead loop is detected. Just stop compiling this method at level 4.

Reviewed-by: kuaiwei.kw, yueshi.zwj

Issue: https://github.com/alibaba/dragonwell8/issues/455

Test Plan: internal tests

CLAassistant commented 1 year ago

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