diff --git a/include/llvm/TableGen/TableGenBackend.h b/include/llvm/TableGen/TableGenBackend.h
index 08c5815..a426e42 100644
--- a/include/llvm/TableGen/TableGenBackend.h
+++ b/include/llvm/TableGen/TableGenBackend.h
@@ -22,6 +22,8 @@
 /// raw_ostream.
 void emitSourceFileHeader(StringRef Desc, raw_ostream &OS);
 
+extern bool TimeRegions;
+
 } // End llvm namespace
 
 #endif
diff --git a/utils/TableGen/CodeGenTarget.cpp b/utils/TableGen/CodeGenTarget.cpp
index 5dcb5e2..5c7be10 100644
--- a/utils/TableGen/CodeGenTarget.cpp
+++ b/utils/TableGen/CodeGenTarget.cpp
@@ -20,8 +20,10 @@
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Timer.h"
 #include "llvm/TableGen/Error.h"
 #include "llvm/TableGen/Record.h"
+#include "llvm/TableGen/TableGenBackend.h"
 #include <algorithm>
 using namespace llvm;
 
@@ -326,6 +328,8 @@
 }
 
 void CodeGenTarget::ReadInstructions() const {
+  NamedRegionTimer T("Read Instructions", "Time spent reading instructions",
+                     "CodeGenTarget", "CodeGenTarget", TimeRegions);
   std::vector<Record*> Insts = Records.getAllDerivedDefinitions("Instruction");
   if (Insts.size() <= 2)
     PrintFatalError("No 'Instruction' subclasses defined!");
diff --git a/utils/TableGen/TableGen.cpp b/utils/TableGen/TableGen.cpp
index 38f81dc..c485ed2 100644
--- a/utils/TableGen/TableGen.cpp
+++ b/utils/TableGen/TableGen.cpp
@@ -55,6 +55,12 @@
   GenExegesis,
 };
 
+namespace llvm {
+/// Storage for TimeRegionsOpt as a global so that backends aren't required to
+/// include CommandLine.h
+bool TimeRegions = false;
+} // end namespace llvm
+
 namespace {
   cl::opt<ActionType>
   Action(cl::desc("Action to perform:"),
@@ -126,6 +132,11 @@
   Class("class", cl::desc("Print Enum list for this class"),
         cl::value_desc("class name"), cl::cat(PrintEnumsCat));
 
+cl::opt<bool, true>
+    TimeRegionsOpt("time-regions",
+                   cl::desc("Time regions of tablegens execution"),
+                   cl::location(TimeRegions));
+
 bool LLVMTableGenMain(raw_ostream &OS, RecordKeeper &Records) {
   switch (Action) {
   case PrintRecords: