{"rdtsc", 0, 0x0f31, X, Cpu586, NoSuf, { 0, 0, 0} },
{"rdmsr", 0, 0x0f32, X, Cpu586, NoSuf, { 0, 0, 0} },
{"cmpxchg8b",1,0x0fc7, 1, Cpu586, NoSuf|Modrm, { LLongMem, 0, 0} },
-{"sysenter",0, 0x0f34, X, Cpu586, NoSuf, { 0, 0, 0} },
-{"sysexit", 0, 0x0f35, X, Cpu586, NoSuf, { 0, 0, 0} },
-{"fxsave", 1, 0x0fae, 0, Cpu586, FP|Modrm, { LLongMem, 0, 0} },
-{"fxrstor", 1, 0x0fae, 1, Cpu586, FP|Modrm, { LLongMem, 0, 0} },
-/* Pentium Pro extensions. */
+/* Pentium II/Pentium Pro extensions. */
+{"sysenter",0, 0x0f34, X, Cpu686, NoSuf, { 0, 0, 0} },
+{"sysexit", 0, 0x0f35, X, Cpu686, NoSuf, { 0, 0, 0} },
+{"fxsave", 1, 0x0fae, 0, Cpu686, FP|Modrm, { LLongMem, 0, 0} },
+{"fxrstor", 1, 0x0fae, 1, Cpu686, FP|Modrm, { LLongMem, 0, 0} },
{"rdpmc", 0, 0x0f33, X, Cpu686, NoSuf, { 0, 0, 0} },
/* official undefined instr. */
{"ud2", 0, 0x0f0b, X, Cpu686, NoSuf, { 0, 0, 0} },