[Docs] Add some release notes for X86 target.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_50@308831 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/docs/ReleaseNotes.rst b/docs/ReleaseNotes.rst
index 45c917f0eded19b36e45a402c08ebff9056a0c0f..800a8ec115b38b2e62827f5beb06e6069e8e180c 100644 (file)
--- a/docs/ReleaseNotes.rst
+++ b/docs/ReleaseNotes.rst
@@ -97,7 +97,25 @@ Changes to the PowerPC Target
 Changes to the X86 Target
 -------------------------
 
- During this release ...
+* Added initial AMD Ryzen (znver1) scheduler support.
+
+* Added support for Intel Goldmont CPUs.
+
+* Add support for avx512vpopcntdq instructions.
+
+* Added heuristics to convert CMOV into branches when it may be profitable.
+
+* More aggressive inlining of memcmp calls.
+
+* Improve vXi64 shuffles on 32-bit targets.
+
+* Improved use of PMOVMSKB for any_of/all_of comparision reductions.
+
+* Improved Silvermont, Sandybridge, and Jaguar (btver2) schedulers.
+
+* Improved support for AVX512 vector rotations.
+
+* Added support for AMD Lightweight Profiling (LWP) instructions.
 
 Changes to the AMDGPU Target
 -----------------------------