SystemZ release notes for 18.x. (llvm#84560)

Author: JonPsson1

clang/docs/ReleaseNotes.rst

@@ -1387,6 +1387,11 @@ NetBSD Support
 
 - Removed support for building NetBSD/i386 6.x or older binaries.
 
+SystemZ Support
+^^^^^^^^^^^^^^^
+- Properly support 16 byte atomic int/fp types and ops. Atomic __int128 (and
+  long double) variables are now aligned to 16 bytes by default (like gcc 14).
+
 WebAssembly Support
 ^^^^^^^^^^^^^^^^^^^
 

llvm/docs/ReleaseNotes.rst

@@ -251,6 +251,17 @@ Changes to the RISC-V Backend
 * ``-mcpu=native`` now detects available features with hwprobe (RISC-V Hardware Probing Interface) on Linux 6.4 or later.
 * The version of Zicfilp/Zicfiss is updated to 1.0.
 
+Changes to the SystemZ Backend
+------------------------------
+
+* Properly support 16 byte atomic int/fp types and ops.
+* Support i128 as legal type in VRs.
+* Add an i128 cost model.
+* Support building individual functions with backchain using the
+  __attribute__((target("backchain"))) syntax.
+* Add exception handling for XPLINK.
+* Add support for llvm-objcopy.
+
 Changes to the WebAssembly Backend
 ----------------------------------
 

openmp/docs/ReleaseNotes.rst

@@ -19,3 +19,5 @@ from the `LLVM releases web site <https://llvm.org/releases/>`_.
 
 Non-comprehensive list of changes in this release
 =================================================
+
+* SystemZ support added.