diff --git a/llvm/lib/Bitcode/Reader/MetadataLoader.cpp b/llvm/lib/Bitcode/Reader/MetadataLoader.cpp
@@ -22,7 +22,7 @@
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/Bitcode/BitcodeReader.h"
-#include "llvm/Bitcode/BitstreamReader.h"
+#include "llvm/Bitstream/BitstreamReader.h"
 #include "llvm/Bitcode/LLVMBitCodes.h"
 #include "llvm/IR/Argument.h"
 #include "llvm/IR/Attributes.h"

diff --git a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -24,8 +24,8 @@
 #include "llvm/ADT/StringMap.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/Triple.h"
-#include "llvm/Bitcode/BitCodes.h"
-#include "llvm/Bitcode/BitstreamWriter.h"
+#include "llvm/Bitstream/BitCodes.h"
+#include "llvm/Bitstream/BitstreamWriter.h"
 #include "llvm/Bitcode/LLVMBitCodes.h"
 #include "llvm/Config/llvm-config.h"
 #include "llvm/IR/Attributes.h"

diff --git a/llvm/lib/Bitstream/CMakeLists.txt b/llvm/lib/Bitstream/CMakeLists.txt
@@ -0,0 +1,2 @@
+add_subdirectory(Reader)
+# The writer is header-only.
diff --git a/llvm/lib/Bitstream/LLVMBuild.txt b/llvm/lib/Bitstream/LLVMBuild.txt
@@ -0,0 +1,23 @@
+;===- ./lib/Bitstream/LLVMBuild.txt ----------------------------*- Conf -*--===;
+;
+; Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+; See https://llvm.org/LICENSE.txt for license information.
+; SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+;
+;===------------------------------------------------------------------------===;
+;
+; This is an LLVMBuild description file for the components in this subdirectory.
+;
+; For more information on the LLVMBuild system, please see:
+;
+;   http://llvm.org/docs/LLVMBuild.html
+;
+;===------------------------------------------------------------------------===;
+
+[common]
+subdirectories = Reader
+
+[component_0]
+type = Group
+name = Bitstream
+parent = Libraries
diff --git a/llvm/lib/Bitcode/Reader/BitstreamReader.cpp → .../lib/Bitstream/Reader/BitstreamReader.cpp b/llvm/lib/Bitcode/Reader/BitstreamReader.cpp → .../lib/Bitstream/Reader/BitstreamReader.cpp
@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/Bitcode/BitstreamReader.h"
+#include "llvm/Bitstream/BitstreamReader.h"
 #include "llvm/ADT/StringRef.h"
 #include <cassert>
 #include <string>

diff --git a/llvm/lib/Bitstream/Reader/CMakeLists.txt b/llvm/lib/Bitstream/Reader/CMakeLists.txt
@@ -0,0 +1,7 @@
+add_llvm_library(LLVMBitstreamReader
+  BitstreamReader.cpp
+
+  ADDITIONAL_HEADER_DIRS
+  ${LLVM_MAIN_INCLUDE_DIR}/llvm/Bitcode
+  ${LLVM_MAIN_INCLUDE_DIR}/llvm/Bitstream
+  )
diff --git a/llvm/lib/Bitstream/Reader/LLVMBuild.txt b/llvm/lib/Bitstream/Reader/LLVMBuild.txt
@@ -0,0 +1,21 @@
+;===- ./lib/Bitstream/Reader/LLVMBuild.txt ---------------------*- Conf -*--===;
+;
+; Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+; See https://llvm.org/LICENSE.txt for license information.
+; SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+;
+;===------------------------------------------------------------------------===;
+;
+; This is an LLVMBuild description file for the components in this subdirectory.
+;
+; For more information on the LLVMBuild system, please see:
+;
+;   http://llvm.org/docs/LLVMBuild.html
+;
+;===------------------------------------------------------------------------===;
+
+[component_0]
+type = Library
+name = BitstreamReader
+parent = Bitstream
+required_libraries = Support
diff --git a/llvm/lib/CMakeLists.txt b/llvm/lib/CMakeLists.txt
@@ -7,6 +7,7 @@ add_subdirectory(IRReader)
 add_subdirectory(CodeGen)
 add_subdirectory(BinaryFormat)
 add_subdirectory(Bitcode)
+add_subdirectory(Bitstream)
 add_subdirectory(Transforms)
 add_subdirectory(Linker)
 add_subdirectory(Analysis)

diff --git a/llvm/lib/LLVMBuild.txt b/llvm/lib/LLVMBuild.txt
@@ -19,6 +19,7 @@ subdirectories =
  Analysis
  AsmParser
  Bitcode
+ Bitstream
  CodeGen
  DebugInfo
  Demangle

diff --git a/llvm/tools/llvm-bcanalyzer/CMakeLists.txt b/llvm/tools/llvm-bcanalyzer/CMakeLists.txt
@@ -1,5 +1,6 @@
 set(LLVM_LINK_COMPONENTS
   BitReader
+  BitstreamReader
   Support
   )
 

diff --git a/llvm/tools/llvm-bcanalyzer/LLVMBuild.txt b/llvm/tools/llvm-bcanalyzer/LLVMBuild.txt
@@ -18,4 +18,4 @@
 type = Tool
 name = llvm-bcanalyzer
 parent = Tools
-required_libraries = BitReader
+required_libraries = BitReader BitstreamReader Support
diff --git a/llvm/tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp b/llvm/tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp
@@ -28,7 +28,7 @@
 
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/Bitcode/BitcodeReader.h"
-#include "llvm/Bitcode/BitstreamReader.h"
+#include "llvm/Bitstream/BitstreamReader.h"
 #include "llvm/Bitcode/LLVMBitCodes.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Format.h"

diff --git a/llvm/unittests/Bitcode/CMakeLists.txt b/llvm/unittests/Bitcode/CMakeLists.txt
@@ -8,6 +8,4 @@ set(LLVM_LINK_COMPONENTS
 
 add_llvm_unittest(BitcodeTests
   BitReaderTest.cpp
-  BitstreamReaderTest.cpp
-  BitstreamWriterTest.cpp
   )
diff --git a/...unittests/Bitcode/BitstreamReaderTest.cpp → ...ittests/Bitstream/BitstreamReaderTest.cpp b/...unittests/Bitcode/BitstreamReaderTest.cpp → ...ittests/Bitstream/BitstreamReaderTest.cpp
@@ -6,9 +6,9 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/Bitcode/BitstreamReader.h"
+#include "llvm/Bitstream/BitstreamReader.h"
 #include "llvm/ADT/STLExtras.h"
-#include "llvm/Bitcode/BitstreamWriter.h"
+#include "llvm/Bitstream/BitstreamWriter.h"
 #include "gtest/gtest.h"
 
 using namespace llvm;

diff --git a/...unittests/Bitcode/BitstreamWriterTest.cpp → ...ittests/Bitstream/BitstreamWriterTest.cpp b/...unittests/Bitcode/BitstreamWriterTest.cpp → ...ittests/Bitstream/BitstreamWriterTest.cpp
@@ -6,7 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/Bitcode/BitstreamWriter.h"
+#include "llvm/Bitstream/BitstreamWriter.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallString.h"
 #include "gtest/gtest.h"

diff --git a/llvm/unittests/Bitstream/CMakeLists.txt b/llvm/unittests/Bitstream/CMakeLists.txt
@@ -0,0 +1,8 @@
+set(LLVM_LINK_COMPONENTS
+  BitstreamReader
+  )
+
+add_llvm_unittest(BitstreamTests
+  BitstreamReaderTest.cpp
+  BitstreamWriterTest.cpp
+  )
diff --git a/llvm/unittests/CMakeLists.txt b/llvm/unittests/CMakeLists.txt
@@ -13,6 +13,7 @@ add_subdirectory(Analysis)
 add_subdirectory(AsmParser)
 add_subdirectory(BinaryFormat)
 add_subdirectory(Bitcode)
+add_subdirectory(Bitstream)
 add_subdirectory(CodeGen)
 add_subdirectory(DebugInfo)
 add_subdirectory(Demangle)

diff --git a/llvm/utils/GenLibDeps.pl b/llvm/utils/GenLibDeps.pl
@@ -96,6 +96,8 @@
     $libpath =~ s/^AsmPrinter/CodeGen\/AsmPrinter/;
     $libpath =~ s/^BitReader/Bitcode\/Reader/;
     $libpath =~ s/^BitWriter/Bitcode\/Writer/;
+    $libpath =~ s/^BitstreamReader/Bitstream\/Reader/;
+    $libpath =~ s/^BitstreamWriter/Bitstream\/Writer/;
     $libpath =~ s/^MSIL/Target\/MSIL/;
     $libpath =~ s/^Core/IR/;
     $libpath =~ s/^Instrumentation/Transforms\/Instrumentation/;
@@ -136,6 +138,8 @@
     $libpath =~ s/^AsmPrinter/CodeGen\/AsmPrinter/;
     $libpath =~ s/^BitReader/Bitcode\/Reader/;
     $libpath =~ s/^BitWriter/Bitcode\/Writer/;
+    $libpath =~ s/^BitstreamReader/Bitstream\/Reader/;
+    $libpath =~ s/^BitstreamWriter/Bitstream\/Writer/;
     $libpath =~ s/^MSIL/Target\/MSIL/;
     $libpath =~ s/^Core/VMCore/;
     $libpath =~ s/^Instrumentation/Transforms\/Instrumentation/;
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,2 @@
		add_subdirectory(Reader)
		# The writer is header-only.