Index: include/llvm/Support/EndianStream.h
===================================================================
--- include/llvm/Support/EndianStream.h
+++ include/llvm/Support/EndianStream.h
@@ -31,6 +31,31 @@
     OS.write((const char *)&Val, sizeof(value_type));
   }
 };
+
+template <>
+template <>
+inline void Writer<little>::write<float>(float Val) {
+  write(FloatToBits(Val));
+}
+
+template <>
+template <>
+inline void Writer<little>::write<double>(double Val) {
+  write(DoubleToBits(Val));
+}
+
+template <>
+template <>
+inline void Writer<big>::write<float>(float Val) {
+  write(FloatToBits(Val));
+}
+
+template <>
+template <>
+inline void Writer<big>::write<double>(double Val) {
+  write(DoubleToBits(Val));
+}
+
 } // end namespace endian
 
 } // end namespace support
Index: unittests/Support/CMakeLists.txt
===================================================================
--- unittests/Support/CMakeLists.txt
+++ unittests/Support/CMakeLists.txt
@@ -14,6 +14,7 @@
   ConvertUTFTest.cpp
   DataExtractorTest.cpp
   DwarfTest.cpp
+  EndianStreamTest.cpp
   EndianTest.cpp
   ErrorOrTest.cpp
   FileOutputBufferTest.cpp
Index: unittests/Support/EndianStreamTest.cpp
===================================================================
--- /dev/null
+++ unittests/Support/EndianStreamTest.cpp
@@ -0,0 +1,157 @@
+//===- unittests/Support/EndianStreamTest.cpp - EndianStream.h tests ------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ADT/SmallString.h"
+#include "llvm/Support/EndianStream.h"
+#include "llvm/Support/DataTypes.h"
+#include "gtest/gtest.h"
+using namespace llvm;
+using namespace support;
+
+namespace {
+
+TEST(EndianStream, WriteInt32LE) {
+  SmallString<16> data;
+
+  {
+    raw_svector_ostream OS(data);
+    endian::Writer<little> LE(OS);
+    LE.write(static_cast<int32_t>(-1362446643));
+  }
+
+  EXPECT_EQ(static_cast<uint8_t>(data[0]), 0xCD);
+  EXPECT_EQ(static_cast<uint8_t>(data[1]), 0xB6);
+  EXPECT_EQ(static_cast<uint8_t>(data[2]), 0xCA);
+  EXPECT_EQ(static_cast<uint8_t>(data[3]), 0xAE);
+}
+
+TEST(EndianStream, WriteInt32BE) {
+  SmallVector<char, 16> data;
+
+  {
+    raw_svector_ostream OS(data);
+    endian::Writer<big> BE(OS);
+    BE.write(static_cast<int32_t>(-1362446643));
+  }
+
+  EXPECT_EQ(static_cast<uint8_t>(data[0]), 0xAE);
+  EXPECT_EQ(static_cast<uint8_t>(data[1]), 0xCA);
+  EXPECT_EQ(static_cast<uint8_t>(data[2]), 0xB6);
+  EXPECT_EQ(static_cast<uint8_t>(data[3]), 0xCD);
+}
+
+
+TEST(EndianStream, WriteFloatLE) {
+  SmallString<16> data;
+
+  {
+    raw_svector_ostream OS(data);
+    endian::Writer<little> LE(OS);
+    LE.write(12345.0f);
+  }
+
+  EXPECT_EQ(static_cast<uint8_t>(data[0]), 0x00);
+  EXPECT_EQ(static_cast<uint8_t>(data[1]), 0xE4);
+  EXPECT_EQ(static_cast<uint8_t>(data[2]), 0x40);
+  EXPECT_EQ(static_cast<uint8_t>(data[3]), 0x46);
+}
+
+TEST(EndianStream, WriteFloatBE) {
+  SmallVector<char, 16> data;
+
+  {
+    raw_svector_ostream OS(data);
+    endian::Writer<big> BE(OS);
+    BE.write(12345.0f);
+  }
+
+  EXPECT_EQ(static_cast<uint8_t>(data[0]), 0x46);
+  EXPECT_EQ(static_cast<uint8_t>(data[1]), 0x40);
+  EXPECT_EQ(static_cast<uint8_t>(data[2]), 0xE4);
+  EXPECT_EQ(static_cast<uint8_t>(data[3]), 0x00);
+}
+
+TEST(EndianStream, WriteInt64LE) {
+  SmallString<16> data;
+
+  {
+    raw_svector_ostream OS(data);
+    endian::Writer<little> LE(OS);
+    LE.write(static_cast<int64_t>(-136244664332342323));
+  }
+
+  EXPECT_EQ(static_cast<uint8_t>(data[0]), 0xCD);
+  EXPECT_EQ(static_cast<uint8_t>(data[1]), 0xAB);
+  EXPECT_EQ(static_cast<uint8_t>(data[2]), 0xED);
+  EXPECT_EQ(static_cast<uint8_t>(data[3]), 0x1B);
+  EXPECT_EQ(static_cast<uint8_t>(data[4]), 0x33);
+  EXPECT_EQ(static_cast<uint8_t>(data[5]), 0xF6);
+  EXPECT_EQ(static_cast<uint8_t>(data[6]), 0x1B);
+  EXPECT_EQ(static_cast<uint8_t>(data[7]), 0xFE);
+}
+
+TEST(EndianStream, WriteInt64BE) {
+  SmallVector<char, 16> data;
+
+  {
+    raw_svector_ostream OS(data);
+    endian::Writer<big> BE(OS);
+    BE.write(static_cast<int64_t>(-136244664332342323));
+  }
+
+  EXPECT_EQ(static_cast<uint8_t>(data[0]), 0xFE);
+  EXPECT_EQ(static_cast<uint8_t>(data[1]), 0x1B);
+  EXPECT_EQ(static_cast<uint8_t>(data[2]), 0xF6);
+  EXPECT_EQ(static_cast<uint8_t>(data[3]), 0x33);
+  EXPECT_EQ(static_cast<uint8_t>(data[4]), 0x1B);
+  EXPECT_EQ(static_cast<uint8_t>(data[5]), 0xED);
+  EXPECT_EQ(static_cast<uint8_t>(data[6]), 0xAB);
+  EXPECT_EQ(static_cast<uint8_t>(data[7]), 0xCD);
+}
+
+TEST(EndianStream, WriteDoubleLE) {
+  SmallString<16> data;
+
+  {
+    raw_svector_ostream OS(data);
+    endian::Writer<little> LE(OS);
+    LE.write(-2349214918.58107);
+  }
+
+  EXPECT_EQ(static_cast<uint8_t>(data[0]), 0x20);
+  EXPECT_EQ(static_cast<uint8_t>(data[1]), 0x98);
+  EXPECT_EQ(static_cast<uint8_t>(data[2]), 0xD2);
+  EXPECT_EQ(static_cast<uint8_t>(data[3]), 0x98);
+  EXPECT_EQ(static_cast<uint8_t>(data[4]), 0xC5);
+  EXPECT_EQ(static_cast<uint8_t>(data[5]), 0x80);
+  EXPECT_EQ(static_cast<uint8_t>(data[6]), 0xE1);
+  EXPECT_EQ(static_cast<uint8_t>(data[7]), 0xC1);
+}
+
+TEST(EndianStream, WriteDoubleBE) {
+  SmallVector<char, 16> data;
+
+  {
+    raw_svector_ostream OS(data);
+    endian::Writer<big> BE(OS);
+    BE.write(-2349214918.58107);
+  }
+
+  EXPECT_EQ(static_cast<uint8_t>(data[0]), 0xC1);
+  EXPECT_EQ(static_cast<uint8_t>(data[1]), 0xE1);
+  EXPECT_EQ(static_cast<uint8_t>(data[2]), 0x80);
+  EXPECT_EQ(static_cast<uint8_t>(data[3]), 0xC5);
+  EXPECT_EQ(static_cast<uint8_t>(data[4]), 0x98);
+  EXPECT_EQ(static_cast<uint8_t>(data[5]), 0xD2);
+  EXPECT_EQ(static_cast<uint8_t>(data[6]), 0x98);
+  EXPECT_EQ(static_cast<uint8_t>(data[7]), 0x20);
+}
+
+
+} // end anon namespace