diff --git a/include/llvm/Support/ConstantRange.h b/include/llvm/Support/ConstantRange.h
index ced3a2c..90dd69f 100644
--- a/include/llvm/Support/ConstantRange.h
+++ b/include/llvm/Support/ConstantRange.h
@@ -155,6 +155,10 @@
   /// constant range.
   ConstantRange subtract(const APInt &CI) const;
 
+  /// \brief Subtract the specified range from this range (aka relative
+  /// complement of the sets).
+  ConstantRange difference(const ConstantRange &CR) const;
+
   /// intersectWith - Return the range that results from the intersection of
   /// this range with another range.  The resultant range is guaranteed to
   /// include all elements contained in both input ranges, and to have the
diff --git a/lib/Support/ConstantRange.cpp b/lib/Support/ConstantRange.cpp
index 61d333f..91d086b 100644
--- a/lib/Support/ConstantRange.cpp
+++ b/lib/Support/ConstantRange.cpp
@@ -248,6 +248,12 @@
   return ConstantRange(Lower - Val, Upper - Val);
 }
 
+/// \brief Subtract the specified range from this range (aka relative complement
+/// of the sets).
+ConstantRange ConstantRange::difference(const ConstantRange &CR) const {
+  return intersectWith(CR.inverse());
+}
+
 /// intersectWith - Return the range that results from the intersection of this
 /// range with another range.  The resultant range is guaranteed to include all
 /// elements contained in both input ranges, and to have the smallest possible
diff --git a/unittests/Support/ConstantRangeTest.cpp b/unittests/Support/ConstantRangeTest.cpp
index a562080..72540c6 100644
--- a/unittests/Support/ConstantRangeTest.cpp
+++ b/unittests/Support/ConstantRangeTest.cpp
@@ -289,6 +289,23 @@
               ConstantRange(16));
 }
 
+TEST_F(ConstantRangeTest, SetDifference) {
+  EXPECT_EQ(Full.difference(Empty), Full);
+  EXPECT_EQ(Full.difference(Full), Empty);
+  EXPECT_EQ(Empty.difference(Empty), Empty);
+  EXPECT_EQ(Empty.difference(Full), Empty);
+
+  ConstantRange A(APInt(16, 3), APInt(16, 7));
+  ConstantRange B(APInt(16, 5), APInt(16, 9));
+  ConstantRange C(APInt(16, 3), APInt(16, 5));
+  ConstantRange D(APInt(16, 7), APInt(16, 9));
+  ConstantRange E(APInt(16, 5), APInt(16, 4));
+  ConstantRange F(APInt(16, 7), APInt(16, 3));
+  EXPECT_EQ(A.difference(B), C);
+  EXPECT_EQ(B.difference(A), D);
+  EXPECT_EQ(E.difference(A), F);
+}
+
 TEST_F(ConstantRangeTest, SubtractAPInt) {
   EXPECT_EQ(Full.subtract(APInt(16, 4)), Full);
   EXPECT_EQ(Empty.subtract(APInt(16, 4)), Empty);