diff --git a/lib/TableGen/TGParser.cpp b/lib/TableGen/TGParser.cpp
index da0086a74ac..c4b48fe5e89 100644
--- a/lib/TableGen/TGParser.cpp
+++ b/lib/TableGen/TGParser.cpp
@@ -382,7 +382,8 @@ static bool isObjectStart(tgtok::TokKind K) {
 
 static std::string GetNewAnonymousName() {
   static unsigned AnonCounter = 0;
-  return "anonymous."+utostr(AnonCounter++);
+  unsigned Tmp = AnonCounter++; // MSVC2012 ICEs without this.
+  return "anonymous." + utostr(Tmp);
 }
 
 /// ParseObjectName - If an object name is specified, return it.  Otherwise,
diff --git a/utils/TableGen/CodeGenRegisters.cpp b/utils/TableGen/CodeGenRegisters.cpp
index 4238340ff06..993b8dba426 100644
--- a/utils/TableGen/CodeGenRegisters.cpp
+++ b/utils/TableGen/CodeGenRegisters.cpp
@@ -703,7 +703,9 @@ CodeGenRegisterClass::CodeGenRegisterClass(CodeGenRegBank &RegBank, Record *R)
   // Rename anonymous register classes.
   if (R->getName().size() > 9 && R->getName()[9] == '.') {
     static unsigned AnonCounter = 0;
-    R->setName("AnonRegClass_"+utostr(AnonCounter++));
+    R->setName("AnonRegClass_" + utostr(AnonCounter));
+    // MSVC2012 ICEs if AnonCounter++ is directly passed to utostr.
+    ++AnonCounter;
   }
 
   std::vector<Record*> TypeList = R->getValueAsListOfDefs("RegTypes");