[llvm-branch-commits] [clang] [lld] [llvm] SystemZ release notes for 18.x. (PR #84560)

[via llvm-branch-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-lld

Author: Jonas Paulsson (JonPsson1)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/84560.diff


3 Files Affected:

- (modified) clang/docs/ReleaseNotes.rst (+5) 
- (modified) lld/docs/ReleaseNotes.rst (+6) 
- (modified) llvm/docs/ReleaseNotes.rst (+10) 


``````````diff
diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index fc27297aea2d6c..6a038ed4b635c7 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -1325,6 +1325,11 @@ AIX Support
   or newer. Similar to the LTO support on AIX, ThinLTO is implemented with
   the libLTO.so plugin.
 
+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
 ^^^^^^^^^^^^^^^^^^^
 
diff --git a/lld/docs/ReleaseNotes.rst b/lld/docs/ReleaseNotes.rst
index 56ba3463aeadc0..4de33363d0532b 100644
--- a/lld/docs/ReleaseNotes.rst
+++ b/lld/docs/ReleaseNotes.rst
@@ -163,5 +163,11 @@ WebAssembly Improvements
   is read from object files within the archive.  This matches the behaviour of
   the ELF linker.
 
+SystemZ
+-------
+
+* Add target support for SystemZ (s390x).
+
+
 Fixes
 #####
diff --git a/llvm/docs/ReleaseNotes.rst b/llvm/docs/ReleaseNotes.rst
index 5b3210138f2f89..7cfa83fc8b0565 100644
--- a/llvm/docs/ReleaseNotes.rst
+++ b/llvm/docs/ReleaseNotes.rst
@@ -215,6 +215,16 @@ Changes to the RISC-V Backend
 * ``-mcpu=sifive-p670`` was added.
 * Support for the Zicond extension is no longer experimental.
 
+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.
+
 Changes to the WebAssembly Backend
 ----------------------------------
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/84560