--- a/hotspot/src/cpu/x86/vm/macroAssembler_x86.hpp	Mon Jan 07 14:08:28 2013 -0800
+++ b/hotspot/src/cpu/x86/vm/macroAssembler_x86.hpp	Tue Jan 08 11:30:51 2013 -0800
@@ -1011,6 +1011,10 @@
       Assembler::vxorpd(dst, nds, src, vector256);
   }
 
+  // Simple version for AVX2 256bit vectors
+  void vpxor(XMMRegister dst, XMMRegister src) { Assembler::vpxor(dst, dst, src, true); }
+  void vpxor(XMMRegister dst, Address src) { Assembler::vpxor(dst, dst, src, true); }
+
   // Move packed integer values from low 128 bit to hign 128 bit in 256 bit vector.
   void vinserti128h(XMMRegister dst, XMMRegister nds, XMMRegister src) {
     if (UseAVX > 1) // vinserti128h is available only in AVX2