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src/hotspot/share/opto/loopopts.cpp

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@@ -1013,10 +1013,15 @@
     if (n->is_Phi()) {
       for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) {
         Node* m = n->fast_out(j);
         if (m->is_FastLock())
           return false;
+        if (m->is_ValueType()) {
+          // TODO this breaks optimizations!
+          // Value types should not be split through phis
+          //return false;
+        }
 #ifdef _LP64
         if (m->Opcode() == Op_ConvI2L)
           return false;
         if (m->is_CastII() && m->isa_CastII()->has_range_check()) {
           return false;
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