diff -r c97db0855565 -r 758c07667682 src/cpu/x86/vm/assembler_x86.hpp
--- a/src/cpu/x86/vm/assembler_x86.hpp	Tue Feb 04 17:38:01 2020 +0800
+++ b/src/cpu/x86/vm/assembler_x86.hpp	Tue Feb 04 18:13:14 2020 +0800
@@ -1527,6 +1527,8 @@
 
   // Shift Right by bytes Logical DoubleQuadword Immediate
   void psrldq(XMMRegister dst, int shift);
+  // Shift Left by bytes Logical DoubleQuadword Immediate
+  void pslldq(XMMRegister dst, int shift);
 
   // Logical Compare 128bit
   void ptest(XMMRegister dst, XMMRegister src);