--- a/hotspot/src/share/vm/opto/memnode.cpp Fri Oct 24 14:25:46 2014 +0200
+++ b/hotspot/src/share/vm/opto/memnode.cpp Fri Oct 24 09:13:12 2014 -0700
@@ -1257,6 +1257,16 @@
result = new ConvI2LNode(phase->transform(result));
}
#endif
+ // Boxing/unboxing can be done from signed & unsigned loads (e.g. LoadUB -> ... -> LoadB pair).
+ // Need to preserve unboxing load type if it is unsigned.
+ switch(this->Opcode()) {
+ case Op_LoadUB:
+ result = new AndINode(phase->transform(result), phase->intcon(0xFF));
+ break;
+ case Op_LoadUS:
+ result = new AndINode(phase->transform(result), phase->intcon(0xFFFF));
+ break;
+ }
return result;
}
}