diff -r df1012f6ba94 -r d96e6839e83d src/hotspot/cpu/x86/macroAssembler_x86.hpp
--- a/src/hotspot/cpu/x86/macroAssembler_x86.hpp	Mon Aug 20 11:37:57 2018 -0700
+++ b/src/hotspot/cpu/x86/macroAssembler_x86.hpp	Mon Aug 20 14:19:30 2018 -0700
@@ -482,6 +482,10 @@
   // from register xmm0. Otherwise, the value is stored from the FPU stack.
   void store_double(Address dst);
 
+  // Save/restore ZMM (512bit) register on stack.
+  void push_zmm(XMMRegister reg);
+  void pop_zmm(XMMRegister reg);
+
   // pushes double TOS element of FPU stack on CPU stack; pops from FPU stack
   void push_fTOS();