--- a/hotspot/src/cpu/ppc/vm/interp_masm_ppc_64.cpp	Tue Sep 27 15:45:44 2016 +0200
+++ b/hotspot/src/cpu/ppc/vm/interp_masm_ppc_64.cpp	Tue Sep 27 10:47:08 2016 +0200
@@ -261,6 +261,9 @@
 }
 
 void InterpreterMacroAssembler::push_l(Register r) {
+  // Clear unused slot.
+  load_const_optimized(R0, 0L);
+  std(R0, 0, R15_esp);
   std(r, - Interpreter::stackElementSize, R15_esp);
   addi(R15_esp, R15_esp, - 2 * Interpreter::stackElementSize );
 }