diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -51,7 +51,19 @@
   For more details refer to :ref:`the SPIR-V support section <spir-v>`.
 - Completed support of OpenCL C 3.0 and C++ for OpenCL 2021 at experimental
   state.
--  ...
+
+- Prebuilt AIX7.2 TL5 SP3+ binary available with following notes and
+  limitations:
+  - C++ driver modes use the system libc++ headers. These headers are included
+    in the optional ``libc++.adt.include`` fileset on AIX.
+  - LTO, although not disabled, is not recommended.
+  - Shared libraries builds (``-shared``) must use explicit symbol export
+    options and/or export lists (e.g., with ``-bE:``) on the link step. Clang
+    currently will not automatically generate symbol export lists as implicit
+    linker inputs.
+
+- ``float.h`` now exposes (in hosted mode) extensions made available from the
+  AIX system header.
 
 Improvements to Clang's diagnostics
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -79,6 +91,9 @@
 - The ``-E -P`` preprocessor output now always omits blank lines, matching
   gcc behaviour. Previously, up to 8 consecutive blank lines could appear
   in the output.
+- AIX platform-related predefined macros added:
+  ``_ARCH_PPC64``, ``__HOS_AIX__``, ``__PPC``, ``__THW_BIG_ENDIAN__``,
+  ``__THW_PPC__``, and ``__powerpc``
 
 New Compiler Flags
 ------------------
@@ -103,6 +118,8 @@
   for `ccache <https://github.com/ccache/ccache/pull/815>`_ and
   `sccache <https://github.com/mozilla/sccache/pull/1055>`_ are under review.
 
+- Clang now accepts "allowlist" spelling for ``-objcmt-allowlist-dir-path``.
+
 Deprecated Compiler Flags
 -------------------------
 
@@ -169,6 +186,8 @@
   attributes, but will now issue an error due to the expansion of the
   predefined ``__clang__`` macro.
 
+- Improved handling of ``__attribute__((__aligned__))`` on AIX to match GCC.
+
 Windows Support
 ---------------
 
diff --git a/libcxx/docs/ReleaseNotes.rst b/libcxx/docs/ReleaseNotes.rst
--- a/libcxx/docs/ReleaseNotes.rst
+++ b/libcxx/docs/ReleaseNotes.rst
@@ -77,6 +77,9 @@
 - More C++2b features have been implemented. :doc:`Status/Cxx2b` has the full
   overview of libc++'s C++2b implementation status.
 
+- 16-bit ``wchar_t`` handling added for ``codecvt_utf8``, ``codecvt_utf16`` and
+  ``codecvt_utf8_utf16``.
+
 API Changes
 -----------
 
diff --git a/llvm/docs/ReleaseNotes.rst b/llvm/docs/ReleaseNotes.rst
--- a/llvm/docs/ReleaseNotes.rst
+++ b/llvm/docs/ReleaseNotes.rst
@@ -105,7 +105,31 @@
 Changes to the PowerPC Target
 -----------------------------
 
-During this release ...
+Linux improvements:
+* Provided a number of builtins for compatibility with the XL compiler.
+* Allow MMA builtin types in pre-P10 compilation units.
+* Add support for Return Oriented Programming (ROP) protection for 32 bit.
+* Refactored code to use more inclusive language.
+* Switched to LLD as the default linker for pre-built Linux binaries.
+* Enabled IEEE quad long double on Linux via ``PPC_LINUX_DEFAULT_IEEELONGDOUBLE``
+  in cmake config.
+  * Added ``__ibm128`` type to represent IBM double-double format, also available
+    as ``__attribute__((mode(IF)))``.
+  * ``-mfloat128`` can now be used in Linux subtargets with VSX enabled.
+* Added quadword atomic load/store support in codegen; not enabled by default.
+* Codegen improvements for splat load, byval parameter, stack lowering, etc.
+* Implemented P10 instruction scheduling model.
+* Implemented P10 instruction fusion pairs.
+* Improved handling of ``#pragma clang loop unroll_and_jam``.
+* Various bug fixes.
+
+AIX Support/improvements:
+* variadic (ellipsis) functions with C complex types are now supported.
+* Added toc-data support for AIX 64-bit.
+* Added toc-data support for read-only globals.
+* Updated default target on AIX from pwr4 to pwr7.
+* AIX 64-bit now use fast-isel for O0.
+* Added DWARF support for 32-bit XCOFF.
 
 Changes to the X86 Target
 -------------------------
@@ -224,6 +248,13 @@
 * llvm-readobj now supports several dump styles (``--needed-libs, --relocs, --syms``) for XCOFF.
 * llvm-symbolizer now supports `--debuginfod <https://llvm.org/docs/CommandGuide/llvm-symbolizer.html>`.
   (`D113717 <https://reviews.llvm.org/D113717>`_)
+* ``llvm-cov`` now accepts "allowlist" spelling for ``-name-allowlist``.
+* ``llvm-nm`` now supports XCOFF object files.
+* Added ``--needed-libs``, aux header, and symbols support in ``llvm-readobj``.
+* Added ``--symbolize-operands`` support in ``llvm-objdump``.
+* Tools that read archive files now support reading AIX big format archive files.
+* Added dump section support in ``obj2yaml``.
+* Added ``yaml2obj`` support for 64-bit XCOFF.
 
 Changes to LLDB
 ---------------------------------