[clang] [clang][x86] Add release note entries describing recent work to making SSE intrinsics generic and usable with constexpr (PR #154737)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Simon Pilgrim (RKSimon)

<details>
<summary>Changes</summary>

I haven't created an exhaustive list of intrinsic changes, but I suppose I could if people see a strong need for it.

---
Full diff: https://github.com/llvm/llvm-project/pull/154737.diff


1 Files Affected:

- (modified) clang/docs/ReleaseNotes.rst (+7) 


``````````diff
diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index fe1dd15c6f885..83e93d487a54e 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -292,6 +292,13 @@ NVPTX Support
 
 X86 Support
 ^^^^^^^^^^^
+- More SSE, AVX and AVX512 intrinsics, including initializers and general
+  arithmetic can now be used in C++ constant expressions.
+- Some SSE, AVX and AVX512 intrinsics have been converted to wrap
+  generic __builtin intrinsics.
+- NOTE: Please avoid use of the __builtin_ia32_* intrinsics - these are not 
+  guaranteed to exist in future releases, or match behaviour with previous
+  releases of clang or other compilers.
 
 Arm and AArch64 Support
 ^^^^^^^^^^^^^^^^^^^^^^^

``````````

</details>


https://github.com/llvm/llvm-project/pull/154737