diff --git a/clang-tools-extra/docs/ReleaseNotes.rst b/clang-tools-extra/docs/ReleaseNotes.rst
index c08fd45c..1d44793 100644
--- a/clang-tools-extra/docs/ReleaseNotes.rst
+++ b/clang-tools-extra/docs/ReleaseNotes.rst
@@ -1,5 +1,5 @@
 ====================================================
-Extra Clang Tools 11.0.0 (In-Progress) Release Notes
+Extra Clang Tools 12.0.0 (In-Progress) Release Notes
 ====================================================
 
 .. contents::
@@ -10,7 +10,7 @@
 
 .. warning::
 
-   These are in-progress notes for the upcoming Extra Clang Tools 11 release.
+   These are in-progress notes for the upcoming Extra Clang Tools 12 release.
    Release notes for previous releases can be found on
    `the Download Page <https://releases.llvm.org/download.html>`_.
 
@@ -18,7 +18,7 @@
 ============
 
 This document contains the release notes for the Extra Clang Tools, part of the
-Clang release 11.0.0. Here we describe the status of the Extra Clang Tools in
+Clang release 12.0.0. Here we describe the status of the Extra Clang Tools in
 some detail, including major improvements from the previous release and new
 feature work. All LLVM releases may be downloaded from the `LLVM releases web
 site <https://llvm.org/releases/>`_.
@@ -32,7 +32,7 @@
 the current one. To see the release notes for a specific release, please
 see the `releases page <https://llvm.org/releases/>`_.
 
-What's New in Extra Clang Tools 11.0.0?
+What's New in Extra Clang Tools 12.0.0?
 =======================================
 
 Some of the major new features and improvements to Extra Clang Tools are listed
@@ -67,187 +67,7 @@
 Improvements to clang-tidy
 --------------------------
 
-New module
-^^^^^^^^^^
-- New module `llvmlibc`.
-
-  This module contains checks related to the LLVM-libc coding standards.
-
-New checks
-^^^^^^^^^^
-
-- New :doc:`abseil-string-find-str-contains
-  <clang-tidy/checks/abseil-string-find-str-contains>` check.
-
-  Finds ``s.find(...) == string::npos`` comparisons (for various string-like types)
-  and suggests replacing with ``absl::StrContains()``.
-
-- New :doc:`cppcoreguidelines-avoid-non-const-global-variables
-  <clang-tidy/checks/cppcoreguidelines-avoid-non-const-global-variables>` check.
-  Finds non-const global variables as described in check I.2 of C++ Core
-  Guidelines.
-
-- New :doc:`bugprone-misplaced-pointer-arithmetic-in-alloc
-  <clang-tidy/checks/bugprone-misplaced-pointer-arithmetic-in-alloc>` check.
-
-  Finds cases where an integer expression is added to or subtracted from the
-  result of a memory allocation function (``malloc()``, ``calloc()``,
-  ``realloc()``, ``alloca()``) instead of its argument.
-
-- New :doc:`bugprone-no-escape
-  <clang-tidy/checks/bugprone-no-escape>` check.
-
-  Finds pointers with the ``noescape`` attribute that are captured by an
-  asynchronously-executed block.
-
-- New :doc:`bugprone-spuriously-wake-up-functions
-  <clang-tidy/checks/bugprone-spuriously-wake-up-functions>` check.
-
-  Finds ``cnd_wait``, ``cnd_timedwait``, ``wait``, ``wait_for``, or
-  ``wait_until`` function calls when the function is not invoked from a loop
-  that checks whether a condition predicate holds or the function has a
-  condition parameter.
-
-- New :doc:`bugprone-reserved-identifier
-  <clang-tidy/checks/bugprone-reserved-identifier>` check.
-
-  Checks for usages of identifiers reserved for use by the implementation.
-
-- New :doc:`bugprone-suspicious-include
-  <clang-tidy/checks/bugprone-suspicious-include>` check.
-
-  Finds cases where an include refers to what appears to be an implementation
-  file, which often leads to hard-to-track-down ODR violations, and diagnoses
-  them.
-
-- New :doc:`cert-oop57-cpp
-  <clang-tidy/checks/cert-oop57-cpp>` check.
-
-  Flags use of the `C` standard library functions ``memset``, ``memcpy`` and
-  ``memcmp`` and similar derivatives on non-trivial types.
-
-- New :doc:`llvmlibc-callee-namespace
-  <clang-tidy/checks/llvmlibc-callee-namespace>` check.
-
-  Checks all calls resolve to functions within ``__llvm_libc`` namespace.
-
-- New :doc:`llvmlibc-implementation-in-namespace
-  <clang-tidy/checks/llvmlibc-implementation-in-namespace>` check.
-
-  Checks all llvm-libc implementation is within the correct namespace.
-
-- New :doc:`llvmlibc-restrict-system-libc-headers
-  <clang-tidy/checks/llvmlibc-restrict-system-libc-headers>` check.
-
-  Finds includes of system libc headers not provided by the compiler within
-  llvm-libc implementations.
-
-- New :doc:`modernize-replace-disallow-copy-and-assign-macro
-  <clang-tidy/checks/modernize-replace-disallow-copy-and-assign-macro>` check.
-
-  Finds macro expansions of ``DISALLOW_COPY_AND_ASSIGN`` and replaces them with
-  a deleted copy constructor and a deleted assignment operator.
-
-- New :doc:`objc-dealloc-in-category
-  <clang-tidy/checks/objc-dealloc-in-category>` check.
-
-  Finds implementations of -dealloc in Objective-C categories.
-
-- New :doc:`misc-no-recursion
-  <clang-tidy/checks/misc-no-recursion>` check.
-
-  Finds recursive functions and diagnoses them.
-
-- New :doc:`objc-nsinvocation-argument-lifetime
-  <clang-tidy/checks/objc-nsinvocation-argument-lifetime>` check.
-
-  Finds calls to ``NSInvocation`` methods under ARC that don't have proper
-  argument object lifetimes.
-
-- New :doc:`readability-use-anyofallof
-  <clang-tidy/checks/readability-use-anyofallof>` check.
-
-  Finds range-based for loops that can be replaced by a call to ``std::any_of``
-  or ``std::all_of``.
-
-New check aliases
-^^^^^^^^^^^^^^^^^
-
-- New alias :doc:`cert-con36-c
-  <clang-tidy/checks/cert-con36-c>` to
-  :doc:`bugprone-spuriously-wake-up-functions
-  <clang-tidy/checks/bugprone-spuriously-wake-up-functions>` was added.
-
-- New alias :doc:`cert-con54-cpp
-  <clang-tidy/checks/cert-con54-cpp>` to
-  :doc:`bugprone-spuriously-wake-up-functions
-  <clang-tidy/checks/bugprone-spuriously-wake-up-functions>` was added.
-
-- New alias :doc:`cert-dcl37-c
-  <clang-tidy/checks/cert-dcl37-c>` to
-  :doc:`bugprone-reserved-identifier
-  <clang-tidy/checks/bugprone-reserved-identifier>` was added.
-
-- New alias :doc:`cert-dcl51-cpp
-  <clang-tidy/checks/cert-dcl51-cpp>` to
-  :doc:`bugprone-reserved-identifier
-  <clang-tidy/checks/bugprone-reserved-identifier>` was added.
-
-- New alias :doc:`cert-str34-c
-  <clang-tidy/checks/cert-str34-c>` to
-  :doc:`bugprone-signed-char-misuse
-  <clang-tidy/checks/bugprone-signed-char-misuse>` was added.
-
-- New alias :doc:`llvm-else-after-return
-  <clang-tidy/checks/llvm-else-after-return>` to
-  :doc:`readability-else-after-return
-  <clang-tidy/checks/readability-else-after-return>` was added.
-
-Changes in existing checks
-^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-- Improved :doc:`performance-faster-string-find
-  <clang-tidy/checks/performance-faster-string-find>` check.
-
-  Now checks ``std::basic_string_view`` by default.
-
-- Improved :doc:`readability-else-after-return
-  <clang-tidy/checks/readability-else-after-return>` check now supports a
-  `WarnOnConditionVariables` option to control whether to refactor condition
-  variables where possible.
-
-- Improved :doc:`readability-identifier-naming
-  <clang-tidy/checks/readability-identifier-naming>` check.
-
-  Now able to rename member references in class template definitions with
-  explicit access.
-
-- Improved :doc:`readability-qualified-auto
-  <clang-tidy/checks/readability-qualified-auto>` check now supports a
-  `AddConstToQualified` to enable adding ``const`` qualifiers to variables
-  typed with ``auto *`` and ``auto &``.
-
-- Improved :doc:`readability-redundant-string-init
-  <clang-tidy/checks/readability-redundant-string-init>` check now supports a
-  `StringNames` option enabling its application to custom string classes. The
-  check now detects in class initializers and constructor initializers which
-  are deemed to be redundant.
-
-- Checks supporting the ``HeaderFileExtensions`` flag now support ``;`` as a
-  delimiter in addition to ``,``, with the latter being deprecated as of this
-  release. This simplifies how one specifies the options on the command line:
-  ``--config="{CheckOptions: [{ key: HeaderFileExtensions, value: h;;hpp;hxx }]}"``
-
-Renamed checks
-^^^^^^^^^^^^^^
-
-- The 'fuchsia-restrict-system-headers' check was renamed to :doc:`portability-restrict-system-includes
-  <clang-tidy/checks/portability-restrict-system-includes>`
-
-Other improvements
-^^^^^^^^^^^^^^^^^^
-
-- For 'run-clang-tidy.py' add option to use alpha checkers from clang-analyzer.
+The improvements are...
 
 Improvements to include-fixer
 -----------------------------
diff --git a/clang-tools-extra/docs/conf.py b/clang-tools-extra/docs/conf.py
index 690917e..a7579d5 100644
--- a/clang-tools-extra/docs/conf.py
+++ b/clang-tools-extra/docs/conf.py
@@ -49,9 +49,9 @@
 # built documents.
 #
 # The short version.
-version = '11'
+version = '12'
 # The full version, including alpha/beta/rc tags.
-release = '11'
+release = '12'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index 8b27e66..10ead60 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -1,5 +1,5 @@
 ========================================
-Clang 11.0.0 (In-Progress) Release Notes
+Clang 12.0.0 (In-Progress) Release Notes
 ========================================
 
 .. contents::
@@ -10,7 +10,7 @@
 
 .. warning::
 
-   These are in-progress notes for the upcoming Clang 11 release.
+   These are in-progress notes for the upcoming Clang 12 release.
    Release notes for previous releases can be found on
    `the Download Page <https://releases.llvm.org/download.html>`_.
 
@@ -18,7 +18,7 @@
 ============
 
 This document contains the release notes for the Clang C/C++/Objective-C
-frontend, part of the LLVM Compiler Infrastructure, release 11.0.0. Here we
+frontend, part of the LLVM Compiler Infrastructure, release 12.0.0. Here we
 describe the status of Clang in some detail, including major
 improvements from the previous release and new feature work. For the
 general LLVM release notes, see `the LLVM
@@ -35,7 +35,7 @@
 the current one. To see the release notes for a specific release, please
 see the `releases page <https://llvm.org/releases/>`_.
 
-What's New in Clang 11.0.0?
+What's New in Clang 12.0.0?
 ===========================
 
 Some of the major new features and improvements to Clang are listed
@@ -51,69 +51,17 @@
 Improvements to Clang's diagnostics
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-- -Wpointer-to-int-cast is a new warning group. This group warns about C-style
-  casts of pointers to a integer type too small to hold all possible values.
-
-- -Wuninitialized-const-reference is a new warning controlled by 
-  -Wuninitialized. It warns on cases where uninitialized variables are passed
-  as const reference arguments to a function.
+- ...
 
 Non-comprehensive list of changes in this release
 -------------------------------------------------
 
-- For the ARM target, C-language intrinsics are now provided for the full Arm
-  v8.1-M MVE instruction set. ``<arm_mve.h>`` supports the complete API defined
-  in the Arm C Language Extensions.
-
-- For the ARM target, C-language intrinsics ``<arm_cde.h>`` for the CDE
-  instruction set are now provided.
-
-- clang adds support for a set of  extended integer types (``_ExtInt(N)``) that
-  permit non-power of 2 integers, exposing the LLVM integer types. Since a major
-  motivating use case for these types is to limit 'bit' usage, these types don't
-  automatically promote to 'int' when operations are done between two
-  ``ExtInt(N)`` types, instead math occurs at the size of the largest
-  ``ExtInt(N)`` type.
-
-- Users of UBSan, PGO, and coverage on Windows will now need to add clang's
-  library resource directory to their library search path. These features all
-  use runtime libraries, and Clang provides these libraries in its resource
-  directory. For example, if LLVM is installed in ``C:\Program Files\LLVM``,
-  then the profile runtime library will appear at
-  ``C:\Program Files\LLVM\lib\clang\11.0.0\lib\windows\clang_rt.profile-x86_64.lib``.
-  To ensure that the linker can find the appropriate library, users should pass
-  ``/LIBPATH:C:\Program Files\LLVM\lib\clang\11.0.0\lib\windows`` to the
-  linker. If the user links the program with the ``clang`` or ``clang-cl``
-  drivers, the driver will pass this flag for them.
-
-- Clang's profile files generated through ``-fprofile-instr-generate`` are using
-  a fixed hashing algorithm that prevents some collision when loading
-  out-of-date profile informations. Clang can still read old profile files.
+- ...
 
 New Compiler Flags
 ------------------
 
-- -fstack-clash-protection will provide a protection against the stack clash
-  attack for x86, s390x and ppc64 architectures through automatic probing of
-  each page of allocated stack.
-
-- -ffp-exception-behavior={ignore,maytrap,strict} allows the user to specify
-  the floating-point exception behavior. The default setting is ``ignore``.
-
-- -ffp-model={precise,strict,fast} provides the user an umbrella option to
-  simplify access to the many single purpose floating point options. The default
-  setting is ``precise``.
-
-- The default module cache has moved from /tmp to a per-user cache directory.
-  By default, this is ~/.cache but on some platforms or installations, this
-  might be elsewhere. The -fmodules-cache-path=... flag continues to work.
-
-- -fpch-instantiate-templates tries to instantiate templates already while
-  generating a precompiled header. Such templates do not need to be
-  instantiated every time the precompiled header is used, which saves compile
-  time. This may result in an error during the precompiled header generation
-  if the source header file is not self-contained. This option is enabled
-  by default for clang-cl.
+- ...
 
 Deprecated Compiler Flags
 -------------------------
@@ -126,29 +74,7 @@
 Modified Compiler Flags
 -----------------------
 
-- -fno-common has been enabled as the default for all targets.  Therefore, C
-  code that uses tentative definitions as definitions of a variable in multiple
-  translation units will trigger multiple-definition linker errors. Generally,
-  this occurs when the use of the ``extern`` keyword is neglected in the
-  declaration of a variable in a header file. In some cases, no specific
-  translation unit provides a definition of the variable. The previous
-  behavior can be restored by specifying ``-fcommon``.
-- -Wasm-ignored-qualifier (ex. `asm const ("")`) has been removed and replaced
-  with an error (this matches a recent change in GCC-9).
-- -Wasm-file-asm-volatile (ex. `asm volatile ("")` at global scope) has been
-  removed and replaced with an error (this matches GCC's behavior).
-- Duplicate qualifiers on asm statements (ex. `asm volatile volatile ("")`) no
-  longer produces a warning via -Wduplicate-decl-specifier, but now an error
-  (this matches GCC's behavior).
-- The deprecated argument ``-f[no-]sanitize-recover`` has changed to mean
-  ``-f[no-]sanitize-recover=all`` instead of
-  ``-f[no-]sanitize-recover=undefined,integer`` and is no longer deprecated.
-- The argument to ``-f[no-]sanitize-trap=...`` is now optional and defaults to
-  ``all``.
-- ``-fno-char8_t`` now disables the ``char8_t`` keyword, not just the use of
-  ``char8_t`` as the character type of ``u8`` literals. This restores the
-  Clang 8 behavior that regressed in Clang 9 and 10.
-- -print-targets has been added to print the registered targets.
+- ...
 
 New Pragmas in Clang
 --------------------
@@ -158,9 +84,7 @@
 Attribute Changes in Clang
 --------------------------
 
-- Attributes can now be specified by clang plugins. See the
-  `Clang Plugins <ClangPlugins.html#defining-attributes>`_ documentation for
-  details.
+- ...
 
 Windows Support
 ---------------
@@ -168,58 +92,15 @@
 C Language Changes in Clang
 ---------------------------
 
-- The default C language standard used when `-std=` is not specified has been
-  upgraded from gnu11 to gnu17.
-
-- Clang now supports the GNU C extension `asm inline`; it won't do anything
-  *yet*, but it will be parsed.
-
 - ...
 
 C++ Language Changes in Clang
 -----------------------------
 
-- Clang now implements a restriction on giving non-C-compatible anonymous
-  structs a typedef name for linkage purposes, as described in C++ committee
-  paper `P1766R1 <http://wg21.link/p1766r1>`. This paper was adopted by the
-  C++ committee as a Defect Report resolution, so it is applied retroactively
-  to all C++ standard versions. This affects code such as:
-
-  .. code-block:: c++
-
-    typedef struct {
-      int f() { return 0; }
-    } S;
-
-  Previous versions of Clang rejected some constructs of this form
-  (specifically, where the linkage of the type happened to be computed
-  before the parser reached the typedef name); those cases are still rejected
-  in Clang 11. In addition, cases that previous versions of Clang did not
-  reject now produce an extension warning. This warning can be disabled with
-  the warning flag ``-Wno-non-c-typedef-for-linkage``.
-
-  Affected code should be updated to provide a tag name for the anonymous
-  struct:
-
-  .. code-block:: c++
-
-    struct S {
-      int f() { return 0; }
-    };
-
-  If the code is shared with a C compilation (for example, if the parts that
-  are not C-compatible are guarded with ``#ifdef __cplusplus``), the typedef
-  declaration should be retained, but a tag name should still be provided:
-
-  .. code-block:: c++
-
-    typedef struct S {
-      int f() { return 0; }
-    } S;
+- ...
 
 C++1z Feature Support
 ^^^^^^^^^^^^^^^^^^^^^
-
 ...
 
 Objective-C Language Changes in Clang
@@ -246,49 +127,19 @@
 Internal API Changes
 --------------------
 
-These are major API changes that have happened since the 10.0.0 release of
+These are major API changes that have happened since the 11.0.0 release of
 Clang. If upgrading an external codebase that uses Clang as a library,
 this section should help get you past the largest hurdles of upgrading.
 
-- ``RecursiveASTVisitor`` no longer calls separate methods to visit specific
-  operator kinds. Previously, ``RecursiveASTVisitor`` treated unary, binary,
-  and compound assignment operators as if they were subclasses of the
-  corresponding AST node. For example, the binary operator plus was treated as
-  if it was a ``BinAdd`` subclass of the ``BinaryOperator`` class: during AST
-  traversal of a ``BinaryOperator`` AST node that had a ``BO_Add`` opcode,
-  ``RecursiveASTVisitor`` was calling the ``TraverseBinAdd`` method instead of
-  ``TraverseBinaryOperator``. This feature was contributing a non-trivial
-  amount of complexity to the implementation of ``RecursiveASTVisitor``, it was
-  used only in a minor way in Clang, was not tested, and as a result it was
-  buggy. Furthermore, this feature was creating a non-uniformity in the API.
-  Since this feature was not documented, it was quite difficult to figure out
-  how to use ``RecursiveASTVisitor`` to visit operators.
-
-  To update your code to the new uniform API, move the code from separate
-  visitation methods into methods that correspond to the actual AST node and
-  perform case analysis based on the operator opcode as needed:
-
-  * ``TraverseUnary*() => TraverseUnaryOperator()``
-  * ``WalkUpFromUnary*() => WalkUpFromUnaryOperator()``
-  * ``VisitUnary*() => VisiUnaryOperator()``
-  * ``TraverseBin*() => TraverseBinaryOperator()``
-  * ``WalkUpFromBin*() => WalkUpFromBinaryOperator()``
-  * ``VisitBin*() => VisiBinaryOperator()``
-  * ``TraverseBin*Assign() => TraverseCompoundAssignOperator()``
-  * ``WalkUpFromBin*Assign() => WalkUpFromCompoundAssignOperator()``
-  * ``VisitBin*Assign() => VisiCompoundAssignOperator()``
+- ...
 
 Build System Changes
 --------------------
 
-These are major changes to the build system that have happened since the 10.0.0
+These are major changes to the build system that have happened since the 11.0.0
 release of Clang. Users of the build system should adjust accordingly.
 
-- clang-tidy and clang-include-fixer are no longer compiled into libclang by
-  default. You can set ``LIBCLANG_INCLUDE_CLANG_TOOLS_EXTRA=ON`` to undo that,
-  but it's expected that that setting will go away eventually. If this is
-  something you need, please reach out to the mailing list to discuss possible
-  ways forward.
+- ...
 
 AST Matchers
 ------------
@@ -298,103 +149,7 @@
 clang-format
 ------------
 
-- Option ``IndentExternBlock`` has been added to optionally apply indenting inside ``extern "C"`` and ``extern "C++"`` blocks.
-
-- ``IndentExternBlock`` option accepts ``AfterExternBlock`` to use the old behavior, as well as Indent and NoIndent options, which map to true and false, respectively.
-
-  .. code-block:: c++
-
-    Indent:                       NoIndent:
-     #ifdef __cplusplus          #ifdef __cplusplus
-     extern "C" {                extern "C++" {
-     #endif                      #endif
-
-          void f(void);          void f(void);
-
-     #ifdef __cplusplus          #ifdef __cplusplus
-     }                           }
-     #endif                      #endif
-
-- Option ``IndentCaseBlocks`` has been added to support treating the block
-  following a switch case label as a scope block which gets indented itself.
-  It helps avoid having the closing bracket align with the switch statement's
-  closing bracket (when ``IndentCaseLabels`` is ``false``).
-
-  .. code-block:: c++
-
-    switch (fool) {                vs.     switch (fool) {
-    case 1:                                case 1: {
-      {                                      bar();
-         bar();                            } break;
-      }                                    default: {
-      break;                                 plop();
-    default:                               }
-      {                                    }
-        plop();
-      }
-    }
-
-- Option ``ObjCBreakBeforeNestedBlockParam`` has been added to optionally apply
-  linebreaks for function arguments declarations before nested blocks.
-
-- Option ``InsertTrailingCommas`` can be set to ``TCS_Wrapped`` to insert
-  trailing commas in container literals (arrays and objects) that wrap across
-  multiple lines. It is currently only available for JavaScript and disabled by
-  default (``TCS_None``).
-
-- Option ``BraceWrapping.BeforeLambdaBody`` has been added to manage lambda
-  line break inside function parameter call in Allman style.
-
-  .. code-block:: c++
-
-      true:
-      connect(
-        []()
-        {
-          foo();
-          bar();
-        });
-
-      false:
-      connect([]() {
-          foo();
-          bar();
-        });
-
-- Option ``AlignConsecutiveBitFields`` has been added to align bit field
-  declarations across multiple adjacent lines
-
-  .. code-block:: c++
-
-      true:
-        bool aaa  : 1;
-        bool a    : 1;
-        bool bb   : 1;
-
-      false:
-        bool aaa : 1;
-        bool a : 1;
-        bool bb : 1;
-
-- Option ``BraceWrapping.BeforeWhile`` has been added to allow wrapping
-  before the ```while`` in a do..while loop. By default the value is (``false``)
-
-  In previous releases ``IndentBraces`` implied ``BraceWrapping.BeforeWhile``.
-  If using a Custom BraceWrapping style you may need to now set
-  ``BraceWrapping.BeforeWhile`` to (``true``) to be explicit.
-
-  .. code-block:: c++
-
-      true:
-      do {
-        foo();
-      }
-      while(1);
-
-      false:
-      do {
-        foo();
-      } while(1);
+- ...
 
 libclang
 --------
diff --git a/clang/docs/analyzer/conf.py b/clang/docs/analyzer/conf.py
index 6873ecc..4fa65b2 100644
--- a/clang/docs/analyzer/conf.py
+++ b/clang/docs/analyzer/conf.py
@@ -49,9 +49,9 @@
 # built documents.
 #
 # The short version.
-version = '11'
+version = '12'
 # The full version, including alpha/beta/rc tags.
-release = '11'
+release = '12'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/clang/docs/conf.py b/clang/docs/conf.py
index 164f15d..b63e829 100644
--- a/clang/docs/conf.py
+++ b/clang/docs/conf.py
@@ -50,9 +50,9 @@
 # built documents.
 #
 # The short version.
-version = '11'
+version = '12'
 # The full version, including alpha/beta/rc tags.
-release = '11'
+release = '12'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/libcxx/CMakeLists.txt b/libcxx/CMakeLists.txt
index aabe31f..26bf553 100644
--- a/libcxx/CMakeLists.txt
+++ b/libcxx/CMakeLists.txt
@@ -32,7 +32,7 @@
   project(libcxx CXX C)
 
   set(PACKAGE_NAME libcxx)
-  set(PACKAGE_VERSION 11.0.0git)
+  set(PACKAGE_VERSION 12.0.0git)
   set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
   set(PACKAGE_BUGREPORT "llvm-bugs@lists.llvm.org")
 
diff --git a/libcxx/docs/ReleaseNotes.rst b/libcxx/docs/ReleaseNotes.rst
index 1db7915..5157685 100644
--- a/libcxx/docs/ReleaseNotes.rst
+++ b/libcxx/docs/ReleaseNotes.rst
@@ -1,5 +1,5 @@
 =========================================
-Libc++ 11.0.0 (In-Progress) Release Notes
+Libc++ 12.0.0 (In-Progress) Release Notes
 =========================================
 
 .. contents::
@@ -10,7 +10,7 @@
 
 .. warning::
 
-   These are in-progress notes for the upcoming libc++ 11 release.
+   These are in-progress notes for the upcoming libc++ 12 release.
    Release notes for previous releases can be found on
    `the Download Page <https://releases.llvm.org/download.html>`_.
 
@@ -18,7 +18,7 @@
 ============
 
 This document contains the release notes for the libc++ C++ Standard Library,
-part of the LLVM Compiler Infrastructure, release 11.0.0. Here we describe the
+part of the LLVM Compiler Infrastructure, release 12.0.0. Here we describe the
 status of libc++ in some detail, including major improvements from the previous
 release and new feature work. For the general LLVM release notes, see `the LLVM
 documentation <https://llvm.org/docs/ReleaseNotes.html>`_. All LLVM releases may
@@ -32,13 +32,13 @@
 the current one. To see the release notes for a specific release, please
 see the `releases page <https://llvm.org/releases/>`_.
 
-What's New in Libc++ 11.0.0?
+What's New in Libc++ 12.0.0?
 ============================
 
 New Features
 ------------
 
-- ``<numbers>``
+- ...
 
 API Changes
 -----------
diff --git a/libcxx/docs/conf.py b/libcxx/docs/conf.py
index 00000ee..797a4d8 100644
--- a/libcxx/docs/conf.py
+++ b/libcxx/docs/conf.py
@@ -47,9 +47,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '11.0'
+version = '12.0'
 # The full version, including alpha/beta/rc tags.
-release = '11.0'
+release = '12.0'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/libcxx/include/__config b/libcxx/include/__config
index 575147c..3b019a0 100644
--- a/libcxx/include/__config
+++ b/libcxx/include/__config
@@ -32,7 +32,7 @@
 #  define _GNUC_VER_NEW 0
 #endif
 
-#define _LIBCPP_VERSION 11000
+#define _LIBCPP_VERSION 12000
 
 #ifndef _LIBCPP_ABI_VERSION
 #  define _LIBCPP_ABI_VERSION 1
diff --git a/libcxx/include/__libcpp_version b/libcxx/include/__libcpp_version
index 82b3803..e334181 100644
--- a/libcxx/include/__libcpp_version
+++ b/libcxx/include/__libcpp_version
@@ -1 +1 @@
-11000
+12000
diff --git a/libunwind/CMakeLists.txt b/libunwind/CMakeLists.txt
index 7065112..f20893f 100644
--- a/libunwind/CMakeLists.txt
+++ b/libunwind/CMakeLists.txt
@@ -83,7 +83,7 @@
   endif()
 
   set(PACKAGE_NAME libunwind)
-  set(PACKAGE_VERSION 11.0.0git)
+  set(PACKAGE_VERSION 12.0.0git)
   set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
   set(PACKAGE_BUGREPORT "llvm-bugs@lists.llvm.org")
 
diff --git a/libunwind/docs/conf.py b/libunwind/docs/conf.py
index 70fb71f..6217ead 100644
--- a/libunwind/docs/conf.py
+++ b/libunwind/docs/conf.py
@@ -48,9 +48,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '11.0'
+version = '12.0'
 # The full version, including alpha/beta/rc tags.
-release = '11.0'
+release = '12.0'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/lld/docs/ReleaseNotes.rst b/lld/docs/ReleaseNotes.rst
index fe3de83..f50c306 100644
--- a/lld/docs/ReleaseNotes.rst
+++ b/lld/docs/ReleaseNotes.rst
@@ -1,19 +1,19 @@
 ========================
-lld 11.0.0 Release Notes
+lld 12.0.0 Release Notes
 ========================
 
 .. contents::
     :local:
 
 .. warning::
-   These are in-progress notes for the upcoming LLVM 11.0.0 release.
+   These are in-progress notes for the upcoming LLVM 12.0.0 release.
    Release notes for previous releases can be found on
    `the Download Page <https://releases.llvm.org/download.html>`_.
 
 Introduction
 ============
 
-This document contains the release notes for the lld linker, release 11.0.0.
+This document contains the release notes for the lld linker, release 12.0.0.
 Here we describe the status of lld, including major improvements
 from the previous release. All lld releases may be downloaded
 from the `LLVM releases web site <https://llvm.org/releases/>`_.
@@ -24,18 +24,12 @@
 ELF Improvements
 ----------------
 
-* New ``--time-trace`` option records a time trace file that can be viewed in
-  chrome://tracing. The file can be specified with ``--time-trace-file``.
-  Trace granularity can be specified with ``--time-trace-granularity``.
-  (`D71060 <https://reviews.llvm.org/D71060>`_)
 * ...
 
 Breaking changes
 ----------------
 
-* One-dash form of some long option (``--thinlto-*``, ``--lto-*``, ``--shuffle-sections=``)
-  are no longer supported.
-* ``--export-dynamic-symbol`` no longer implies ``-u``.
+* ...
 
 COFF Improvements
 -----------------
diff --git a/lld/docs/conf.py b/lld/docs/conf.py
index 7d4fc0c..7867d9a 100644
--- a/lld/docs/conf.py
+++ b/lld/docs/conf.py
@@ -48,9 +48,9 @@
 # built documents.
 #
 # The short version.
-version = '11'
+version = '12'
 # The full version, including alpha/beta/rc tags.
-release = '11'
+release = '12'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/llvm/CMakeLists.txt b/llvm/CMakeLists.txt
index eacf8d5..d144266 100644
--- a/llvm/CMakeLists.txt
+++ b/llvm/CMakeLists.txt
@@ -24,7 +24,7 @@
 endif()
 
 if(NOT DEFINED LLVM_VERSION_MAJOR)
-  set(LLVM_VERSION_MAJOR 11)
+  set(LLVM_VERSION_MAJOR 12)
 endif()
 if(NOT DEFINED LLVM_VERSION_MINOR)
   set(LLVM_VERSION_MINOR 0)
diff --git a/llvm/docs/ReleaseNotes.rst b/llvm/docs/ReleaseNotes.rst
index 8d8da95..39a5361 100644
--- a/llvm/docs/ReleaseNotes.rst
+++ b/llvm/docs/ReleaseNotes.rst
@@ -1,12 +1,12 @@
 =========================
-LLVM 11.0.0 Release Notes
+LLVM 12.0.0 Release Notes
 =========================
 
 .. contents::
     :local:
 
 .. warning::
-   These are in-progress notes for the upcoming LLVM 11 release.
+   These are in-progress notes for the upcoming LLVM 12 release.
    Release notes for previous releases can be found on
    `the Download Page <https://releases.llvm.org/download.html>`_.
 
@@ -15,7 +15,7 @@
 ============
 
 This document contains the release notes for the LLVM Compiler Infrastructure,
-release 11.0.0.  Here we describe the status of LLVM, including major improvements
+release 12.0.0.  Here we describe the status of LLVM, including major improvements
 from the previous release, improvements in various subprojects of LLVM, and
 some of the current users of the code.  All LLVM releases may be downloaded
 from the `LLVM releases web site <https://llvm.org/releases/>`_.
@@ -57,22 +57,7 @@
 Changes to the LLVM IR
 ----------------------
 
-* The callsite attribute `vector-function-abi-variant
-  <https://llvm.org/docs/LangRef.html#call-site-attributes>`_ has been
-  added to describe the mapping between scalar functions and vector
-  functions, to enable vectorization of call sites. The information
-  provided by the attribute is interfaced via the API provided by the
-  ``VFDatabase`` class.
-
-* `dereferenceable` attributes and metadata on pointers no longer imply
-  anything about the alignment of the pointer in question. Previously, some
-  optimizations would make assumptions based on the type of the pointer. This
-  behavior was undocumented. To preserve optimizations, frontends may need to
-  be updated to generate appropriate `align` attributes and metadata.
-
-* The DIModule metadata is extended to contain file and line number
-  information. This information is used to represent Fortran modules debug
-  info at IR level.
+* ...
 
 Changes to building LLVM
 ------------------------
@@ -82,21 +67,6 @@
 
 During this release ...
 
-* Implemented C-language intrinsics for the full Arm v8.1-M MVE instruction
-  set. ``<arm_mve.h>`` now supports the complete API defined in the Arm C
-  Language Extensions.
-
-* Added support for assembly for the optional Custom Datapath Extension (CDE)
-  for Arm M-profile targets.
-
-* Implemented C-language intrinsics ``<arm_cde.h>`` for the CDE instruction set.
-
-* Clang now defaults to ``-fomit-frame-pointer`` when targeting non-Android
-  Linux for arm and thumb when optimizations are enabled. Users that were
-  previously not specifying a value and relying on the implicit compiler
-  default may wish to specify ``-fno-omit-frame-pointer`` to get the old
-  behavior. This improves compatibility with GCC.
-
 Changes to the MIPS Target
 --------------------------
 
@@ -113,45 +83,20 @@
 
 During this release ...
 
-
-* Functions with the probe-stack attribute set to "inline-asm" are now protected
-  against stack clash without the need of a third-party probing function and
-  with limited impact on performance.
-* -x86-enable-old-knl-abi command line switch has been removed. v32i16/v64i8
-  vectors are always passed in ZMM register when avx512f is enabled and avx512bw
-  is disabled.
-* Vectors larger than 512 bits with i16 or i8 elements will be passed in
-  multiple ZMM registers when avx512f is enabled. Previously this required
-  avx512bw otherwise they would split into multiple YMM registers. This means
-  vXi16/vXi8 vectors are consistently treated the same as
-  vXi32/vXi64/vXf64/vXf32 vectors of the same total width.
-
 Changes to the AMDGPU Target
 -----------------------------
 
-* The backend default denormal handling mode has been switched to on
-  for all targets for all compute function types. Frontends wishing to
-  retain the old behavior should explicitly request f32 denormal
-  flushing.
+During this release ...
 
 Changes to the AVR Target
 -----------------------------
 
-* Moved from an experimental backend to an official backend. AVR support is now
-  included by default in all LLVM builds and releases and is available under
-  the "avr-unknown-unknown" target triple.
+During this release ...
 
 Changes to the WebAssembly Target
 ---------------------------------
 
-* Programs which don't have a "main" function, called "reactors" are now
-  properly supported, with a new `-mexec-model=reactor` flag. Programs which
-  previously used `-Wl,--no-entry` to avoid having a main function should
-  switch to this new flag, so that static initialization is properly
-  performed.
-
-* `__attribute__((visibility("protected")))` now evokes a warning, as
-  WebAssembly does not support "protected" visibility.
+During this release ...
 
 Changes to the OCaml bindings
 -----------------------------
@@ -173,28 +118,17 @@
 Changes to the Debug Info
 ---------------------------------
 
-* LLVM now supports the debug entry values (DW_OP_entry_value) production for
-  the x86, ARM, and AArch64 targets by default. Other targets can use
-  the utility by using the experimental option ("-debug-entry-values").
-  This is a debug info feature that allows debuggers to recover the value of
-  optimized-out parameters by going up a stack frame and interpreting the values
-  passed to the callee. The feature improves the debugging user experience when
-  debugging optimized code.
+During this release ...
 
 Changes to the LLVM tools
 ---------------------------------
 
-* Added an option (--show-section-sizes) to llvm-dwarfdump to show the sizes
-  of all debug sections within a file.
-
-* llvm-nm now implements the flag ``--special-syms`` and will filter out special
-  symbols, i.e. mapping symbols on ARM and AArch64, by default. This matches
-  the GNU nm behavior.
+During this release ...
 
 Changes to LLDB
 ===============
 
-External Open Source Projects Using LLVM 11
+External Open Source Projects Using LLVM 12
 ===========================================
 
 * A project...
diff --git a/llvm/utils/gn/secondary/llvm/version.gni b/llvm/utils/gn/secondary/llvm/version.gni
index 44c8736..a66a925 100644
--- a/llvm/utils/gn/secondary/llvm/version.gni
+++ b/llvm/utils/gn/secondary/llvm/version.gni
@@ -1,4 +1,4 @@
-llvm_version_major = 11
+llvm_version_major = 12
 llvm_version_minor = 0
 llvm_version_patch = 0
 llvm_version = "$llvm_version_major.$llvm_version_minor.$llvm_version_patch"
diff --git a/llvm/utils/lit/lit/__init__.py b/llvm/utils/lit/lit/__init__.py
index 6bf0132..d7b845e 100644
--- a/llvm/utils/lit/lit/__init__.py
+++ b/llvm/utils/lit/lit/__init__.py
@@ -2,7 +2,7 @@
 
 __author__ = 'Daniel Dunbar'
 __email__ = 'daniel@minormatter.com'
-__versioninfo__ = (0, 11, 0)
+__versioninfo__ = (0, 12, 0)
 __version__ = '.'.join(str(v) for v in __versioninfo__) + 'dev'
 
 __all__ = []
diff --git a/llvm/utils/release/build_llvm_package.bat b/llvm/utils/release/build_llvm_package.bat
index 8e487ef..35dcd9f 100755
--- a/llvm/utils/release/build_llvm_package.bat
+++ b/llvm/utils/release/build_llvm_package.bat
@@ -27,8 +27,8 @@
 for /f "usebackq" %%i in (`PowerShell ^(Get-Date^).ToString^('yyyyMMdd'^)`) do set datestamp=%%i
 
 set revision=%1
-set package_version=11.0.0-%revision:~0,8%
-set clang_format_vs_version=11.0.0.%datestamp%
+set package_version=12.0.0-%revision:~0,8%
+set clang_format_vs_version=12.0.0.%datestamp%
 set build_dir=llvm_package_%revision:~0,8%
 
 echo Revision: %revision%
diff --git a/polly/docs/ReleaseNotes.rst b/polly/docs/ReleaseNotes.rst
index ab95eae..df3f7ba 100644
--- a/polly/docs/ReleaseNotes.rst
+++ b/polly/docs/ReleaseNotes.rst
@@ -1,8 +1,8 @@
 =============================
-Release Notes 11.0 (upcoming)
+Release Notes 12.0 (upcoming)
 =============================
 
-In Polly 11 the following important changes have been incorporated.
+In Polly 12 the following important changes have been incorporated.
 
 .. warning::
 
diff --git a/polly/docs/conf.py b/polly/docs/conf.py
index 8b59947..31af9c6 100644
--- a/polly/docs/conf.py
+++ b/polly/docs/conf.py
@@ -49,9 +49,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '11.0-devel'
+version = '12.0-devel'
 # The full version, including alpha/beta/rc tags.
-release = '11.0-devel'
+release = '12.0-devel'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/pstl/docs/ReleaseNotes.rst b/pstl/docs/ReleaseNotes.rst
index e7771d4..60e1c59 100644
--- a/pstl/docs/ReleaseNotes.rst
+++ b/pstl/docs/ReleaseNotes.rst
@@ -1,5 +1,5 @@
 =======================================
-PSTL 11.0.0 (In-Progress) Release Notes
+PSTL 12.0.0 (In-Progress) Release Notes
 =======================================
 
 .. contents::
@@ -10,7 +10,7 @@
 
 .. warning::
 
-   These are in-progress notes for the upcoming pstl 11 release.
+   These are in-progress notes for the upcoming pstl 12 release.
    Release notes for previous releases can be found on
    `the Download Page <https://releases.llvm.org/download.html>`_.
 
@@ -18,7 +18,7 @@
 ============
 
 This document contains the release notes for the PSTL parallel algorithms
-library, part of the LLVM Compiler Infrastructure, release 11.0.0. Here we
+library, part of the LLVM Compiler Infrastructure, release 12.0.0. Here we
 describe the status of the library in some detail, including major improvements
 from the previous release and new feature work. For the general LLVM release
 notes, see `the LLVM documentation <https://llvm.org/docs/ReleaseNotes.html>`_.
@@ -30,7 +30,7 @@
 To see the release notes for a specific release, please see the `releases
 page <https://llvm.org/releases/>`_.
 
-What's New in PSTL 11.0.0?
+What's New in PSTL 12.0.0?
 ==========================
 
 New Features
diff --git a/pstl/include/pstl/internal/pstl_config.h b/pstl/include/pstl/internal/pstl_config.h
index 4f9df12..7137a37 100644
--- a/pstl/include/pstl/internal/pstl_config.h
+++ b/pstl/include/pstl/internal/pstl_config.h
@@ -13,7 +13,7 @@
 #include <__pstl_config_site>
 
 // The version is XYYZ, where X is major, YY is minor, and Z is patch (i.e. X.YY.Z)
-#define _PSTL_VERSION 11000
+#define _PSTL_VERSION 12000
 #define _PSTL_VERSION_MAJOR (_PSTL_VERSION / 1000)
 #define _PSTL_VERSION_MINOR ((_PSTL_VERSION % 1000) / 10)
 #define _PSTL_VERSION_PATCH (_PSTL_VERSION % 10)
diff --git a/pstl/test/pstl/version.pass.cpp b/pstl/test/pstl/version.pass.cpp
index c47ef14..92d06cb 100644
--- a/pstl/test/pstl/version.pass.cpp
+++ b/pstl/test/pstl/version.pass.cpp
@@ -8,8 +8,8 @@
 
 #include <pstl/internal/pstl_config.h>
 
-static_assert(_PSTL_VERSION == 11000);
-static_assert(_PSTL_VERSION_MAJOR == 11);
+static_assert(_PSTL_VERSION == 12000);
+static_assert(_PSTL_VERSION_MAJOR == 12);
 static_assert(_PSTL_VERSION_MINOR == 00);
 static_assert(_PSTL_VERSION_PATCH == 0);