[PowerPC] Update LLVM 20.1.0 Release Notes

[amy-kwan]

This PR adds LLVM 20.1.0 release notes that are related to the PowerPC target.

[llvmbot]

@llvm/pr-subscribers-clang

Author: Amy Kwan (amy-kwan)

Changes

This PR adds LLVM 20.1.0 release notes that are related to the PowerPC target.

---

Full diff: https://github.com/llvm/llvm-project/pull/128764.diff

2 Files Affected:

• (modified) clang/docs/ReleaseNotes.rst (+2)
• (modified) llvm/docs/ReleaseNotes.md (+29-1)

diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index a2518042cb5b0..153afdb3d59e3 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -1269,6 +1269,8 @@ CUDA Support
 
 AIX Support
 ^^^^^^^^^^^
+- Fixed the ``-print-runtime-dir`` option.
+- Enable continuous profile syncing feature on AIX.
 
 NetBSD Support
 ^^^^^^^^^^^^^^
diff --git a/llvm/docs/ReleaseNotes.md b/llvm/docs/ReleaseNotes.md
index e654509792652..f4a8ac21a8312 100644
--- a/llvm/docs/ReleaseNotes.md
+++ b/llvm/docs/ReleaseNotes.md
@@ -263,7 +263,23 @@ Changes to the PowerPC Backend
 ------------------------------
 
 * The Linux `ppc64` LLC default cpu is updated from `ppc` to `ppc64`.
-* The AIX LLC default cpu is updated from `generic` to `pwr7`.
+* Replaced PPCMergeStringPool with GlobalMerge.
+* Disabled vsx and altivec when -msoft-float is used.
+* Added support for -mcpu=pwr11 -mtune=pwr11.
+* Implemented BCD assist builtins.
+* Expanded global named register support.
+* Updated to use tablegen's MatchRegisterName().
+* Fixed saving of Link Register when using ROP Protect.
+* Fixed SUBREG_TO_REG handling in the RegisterCoalescer.
+* Fixed data layout alignment of i128 to 16.
+* Fixed codegen for transparent_union function parameters.
+* Added an error for incorrect use of memory operands.
+* Other various bug fixes and codegen improvements.
+
+AIX Specific:
+* LLC default cpu is updated from `generic` to `pwr7`.
+* Fixed handling in emitGlobalConstantImpl to emit aliases to subobjects at proper offsets.
+* Enabled aggressive merging of constants to reduce TOC entries.
 
 Changes to the RISC-V Backend
 -----------------------------
@@ -478,6 +494,10 @@ Changes to the LLVM tools
 
 * llvm-objcopy now prints the correct file path in the error message when the output file specified by `--dump-section` cannot be opened.
 
+* llvm-cxxfilt now supports demangling call expressions encoded using `cp` instead of `cl`.
+
+* llvm-objdump now supports printing the file header, load section header and auxillary header for XCOFF object files under the ``--private-headers`` option.
+
 Changes to LLDB
 ---------------------------------
 
@@ -630,6 +650,14 @@ Changes to BOLT
 Changes to Sanitizers
 ---------------------
 
+Changes to the Profile Runtime
+------------------------------
+
+* On platforms where ``atexit``-registered functions are not called when
+  a DSO is ``dlclose``'d, a mechanism is added that implements this
+  missing functionality for calls to ``atexit`` in the profile runtime.
+  [This is currently only enabled on AIX](https://github.com/llvm/llvm-project/pull/102940).
+
 Other Changes
 -------------
 

[amy-kwan]

@hubert-reinterpretcast Thanks for catching the typo!

[github-actions]

@amy-kwan (or anyone else). If you would like to add a note about this fix in the release notes (completely optional). Please reply to this comment with a one or two sentence description of the fix. When you are done, please add the release:note label to this PR.