Hi hs20 uses two new internal instructions fast_aldc and fast_aldc_w. see: openjdk/hotspot/src/share/vm/interpreter/bytecodes.hpp
This webrev fix by backporting Zero fixes from OpenJDK bug 7032458 and 7030207. http://labb.zafena.se/openjdk/pr696-zero-fast_aldc-and-fast_aldc_w-regression-hs20/ The webrev are made against hsx20 http://hg.openjdk.java.net/hsx/hsx20/master/ I don't have a bug id for this. Cheers Xerxes
