Index: include/llvm/CodeGen/MachineValueType.h
===================================================================
--- include/llvm/CodeGen/MachineValueType.h
+++ include/llvm/CodeGen/MachineValueType.h
@@ -17,6 +17,7 @@
 
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/MathExtras.h"
+#include "llvm/ADT/iterator_range.h"
 
 namespace llvm {
 
@@ -575,6 +576,49 @@
     /// returned as Other, otherwise they are invalid.
     static MVT getVT(Type *Ty, bool HandleUnknown = false);
 
+  private:
+    /// A simple iterator over the MVT::SimpleValueType enum.
+    struct mvt_iterator {
+      SimpleValueType VT;
+      mvt_iterator(SimpleValueType VT) : VT(VT) {}
+      MVT operator*() const { return VT; }
+      bool operator!=(const mvt_iterator &LHS) const { return VT != LHS.VT; }
+      mvt_iterator operator++() {
+        SimpleValueType OldVT = VT;
+        VT = (MVT::SimpleValueType)((int)VT + 1);
+        assert((int)VT <= MVT::MAX_ALLOWED_VALUETYPE &&
+               "MVT iterator overflowed.");
+        return OldVT;
+      }
+    };
+    /// A range of the MVT::SimpleValueType enum.
+    typedef iterator_range<mvt_iterator> mvt_range;
+
+  public:
+    /// @name SimpleValueType Iteration
+    /// @{
+    static mvt_range all_types() {
+      return mvt_range((MVT::SimpleValueType)0, MVT::LAST_VALUETYPE);
+    }
+    static mvt_range integer_types() {
+      return mvt_range(MVT::FIRST_INTEGER_VALUETYPE,
+                       MVT::LAST_INTEGER_VALUETYPE);
+    }
+    static mvt_range fp_types() {
+      return mvt_range(MVT::FIRST_FP_VALUETYPE, MVT::LAST_FP_VALUETYPE);
+    }
+    static mvt_range vector_types() {
+      return mvt_range(MVT::FIRST_VECTOR_VALUETYPE, MVT::LAST_VECTOR_VALUETYPE);
+    }
+    static mvt_range integer_vector_types() {
+      return mvt_range(MVT::FIRST_INTEGER_VECTOR_VALUETYPE,
+                       MVT::LAST_INTEGER_VECTOR_VALUETYPE);
+    }
+    static mvt_range fp_vector_types() {
+      return mvt_range(MVT::FIRST_FP_VECTOR_VALUETYPE,
+                       MVT::LAST_FP_VECTOR_VALUETYPE);
+    }
+    /// @}
   };
 
 } // End llvm namespace
Index: lib/Target/X86/X86ISelLowering.cpp
===================================================================
--- lib/Target/X86/X86ISelLowering.cpp
+++ lib/Target/X86/X86ISelLowering.cpp
@@ -1082,9 +1082,8 @@
     setOperationAction(ISD::FP_EXTEND,          MVT::v2f32, Custom);
     setOperationAction(ISD::FP_ROUND,           MVT::v2f32, Custom);
 
-    for (int i = MVT::FIRST_VECTOR_VALUETYPE; i <= MVT::LAST_VECTOR_VALUETYPE;
-         ++i)
-      setLoadExtAction(ISD::EXTLOAD, (MVT::SimpleValueType)i, MVT::v2f32, Legal);
+    for (MVT VT : MVT::vector_types())
+      setLoadExtAction(ISD::EXTLOAD, VT, MVT::v2f32, Legal);
 
     setOperationAction(ISD::BITCAST,            MVT::v2i32, Custom);
     setOperationAction(ISD::BITCAST,            MVT::v4i16, Custom);