--- a/hotspot/src/cpu/x86/vm/assembler_x86.cpp	Mon Jan 07 14:08:28 2013 -0800
+++ b/hotspot/src/cpu/x86/vm/assembler_x86.cpp	Tue Jan 08 11:30:51 2013 -0800
@@ -2468,6 +2468,26 @@
   emit_int8((unsigned char)(0xC0 | encode));
 }
 
+void Assembler::vptest(XMMRegister dst, Address src) {
+  assert(VM_Version::supports_avx(), "");
+  InstructionMark im(this);
+  bool vector256 = true;
+  assert(dst != xnoreg, "sanity");
+  int dst_enc = dst->encoding();
+  // swap src<->dst for encoding
+  vex_prefix(src, dst_enc, dst_enc, VEX_SIMD_66, VEX_OPCODE_0F_38, false, vector256);
+  emit_int8(0x17);
+  emit_operand(dst, src);
+}
+
+void Assembler::vptest(XMMRegister dst, XMMRegister src) {
+  assert(VM_Version::supports_avx(), "");
+  bool vector256 = true;
+  int encode = vex_prefix_and_encode(dst, xnoreg, src, VEX_SIMD_66, vector256, VEX_OPCODE_0F_38);
+  emit_int8(0x17);
+  emit_int8((unsigned char)(0xC0 | encode));
+}
+
 void Assembler::punpcklbw(XMMRegister dst, Address src) {
   NOT_LP64(assert(VM_Version::supports_sse2(), ""));
   assert((UseAVX > 0), "SSE mode requires address alignment 16 bytes");