--- a/hotspot/src/cpu/x86/vm/assembler_x86.cpp	Fri Feb 08 08:16:00 2013 -0800
+++ b/hotspot/src/cpu/x86/vm/assembler_x86.cpp	Fri Feb 08 15:07:17 2013 -0800
@@ -2270,10 +2270,11 @@
 }
 
 void Assembler::vpermq(XMMRegister dst, XMMRegister src, int imm8, bool vector256) {
-    int encode = simd_prefix_and_encode(dst, xnoreg, src, VEX_SIMD_66, VEX_OPCODE_0F_3A, true, vector256);
-    emit_int8(0x00);
-    emit_int8(0xC0 | encode);
-    emit_int8(imm8);
+  assert(VM_Version::supports_avx2(), "");
+  int encode = simd_prefix_and_encode(dst, xnoreg, src, VEX_SIMD_66, VEX_OPCODE_0F_3A, true, vector256);
+  emit_int8(0x00);
+  emit_int8(0xC0 | encode);
+  emit_int8(imm8);
 }
 
 void Assembler::pcmpestri(XMMRegister dst, Address src, int imm8) {