--- old/src/cpu/x86/vm/globals_x86.hpp	2015-12-07 11:06:35.083370030 -0800
+++ new/src/cpu/x86/vm/globals_x86.hpp	2015-12-07 11:06:34.930356042 -0800
@@ -175,9 +175,6 @@
           "Use RTM Xend instead of Xabort when lock busy")                  \
                                                                             \
   /* assembler */                                                           \
-  product(bool, Use486InstrsOnly, false,                                    \
-          "Use 80486 Compliant instruction subset")                         \
-                                                                            \
   product(bool, UseCountLeadingZerosInstruction, false,                     \
           "Use count leading zeros instruction")                            \
                                                                             \
--- old/src/cpu/x86/vm/vm_version_x86.cpp	2015-12-07 11:06:35.789434574 -0800
+++ new/src/cpu/x86/vm/vm_version_x86.cpp	2015-12-07 11:06:35.675424152 -0800
@@ -473,23 +473,21 @@
   // i486 internal cache is both I&D and has a 16-byte line size
   _L1_data_cache_line_size = 16;
 
-  if (!Use486InstrsOnly) {
-    // Get raw processor info
+  // Get raw processor info
 
-    get_cpu_info_stub(&_cpuid_info);
+  get_cpu_info_stub(&_cpuid_info);
 
-    assert_is_initialized();
-    _cpu = extended_cpu_family();
-    _model = extended_cpu_model();
-    _stepping = cpu_stepping();
+  assert_is_initialized();
+  _cpu = extended_cpu_family();
+  _model = extended_cpu_model();
+  _stepping = cpu_stepping();
 
-    if (cpu_family() > 4) { // it supports CPUID
-      _cpuFeatures = feature_flags();
-      // Logical processors are only available on P4s and above,
-      // and only if hyperthreading is available.
-      _logical_processors_per_package = logical_processor_count();
-      _L1_data_cache_line_size = L1_line_size();
-    }
+  if (cpu_family() > 4) { // it supports CPUID
+    _cpuFeatures = feature_flags();
+    // Logical processors are only available on P4s and above,
+    // and only if hyperthreading is available.
+    _logical_processors_per_package = logical_processor_count();
+    _L1_data_cache_line_size = L1_line_size();
   }
 
   _supports_cx8 = supports_cmpxchg8();