diff --git a/unittests/Support/SwapByteOrderTest.cpp b/unittests/Support/SwapByteOrderTest.cpp
index 525cfc1aea8..4f2537c4d5d 100644
--- a/unittests/Support/SwapByteOrderTest.cpp
+++ b/unittests/Support/SwapByteOrderTest.cpp
@@ -125,6 +125,19 @@ TEST(getSwappedBytes, int64_t) {
     sys::getSwappedBytes(int64_t(0x8877665544332211LL)));
 }
 
+TEST(getSwappedBytes, float) {
+  EXPECT_EQ(1.79366203433576585078237386661e-43f, sys::getSwappedBytes(-0.0f));
+  // 0x11223344
+  EXPECT_EQ(7.1653228759765625e2f, sys::getSwappedBytes(1.2795344e-28f));
+}
+
+TEST(getSwappedBytes, double) {
+  EXPECT_EQ(6.32404026676795576546008054871e-322, sys::getSwappedBytes(-0.0));
+  // 0x1122334455667788
+  EXPECT_EQ(-7.08687663657301358331704585496e-268,
+    sys::getSwappedBytes(3.84141202447173065923064450234e-226));
+}
+
 TEST(swapByteOrder, uint8_t) {
   uint8_t value = 0x11;
   sys::swapByteOrder(value);
@@ -173,4 +186,16 @@ TEST(swapByteOrder, int64_t) {
   EXPECT_EQ(int64_t(0x1122334455667788LL), value);
 }
 
+TEST(swapByteOrder, float) {
+  float value = 7.1653228759765625e2f; // 0x44332211
+  sys::swapByteOrder(value);
+  EXPECT_EQ(1.2795344e-28f, value);
+}
+
+TEST(swapByteOrder, double) {
+  double value = -7.08687663657301358331704585496e-268; // 0x8877665544332211
+  sys::swapByteOrder(value);
+  EXPECT_EQ(3.84141202447173065923064450234e-226, value);
+}
+
 }