Add release note for MemorySSA.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_39@277739 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/docs/ReleaseNotes.rst b/docs/ReleaseNotes.rst
index a39f87327c07b6b7693be8a0d52799356870e317..7cd8c3658467e1fa0eb9dc5a014c55e6d119eb7a 100644 (file)
--- a/docs/ReleaseNotes.rst
+++ b/docs/ReleaseNotes.rst
@@ -74,6 +74,11 @@ Non-comprehensive list of changes in this release
 
 * Raised the minimum required CMake version to 3.4.3.
 
+* Added the MemorySSA analysis, which hopes to replace MemoryDependenceAnalysis.
+  It should provide higher-quality results than MemDep, and be algorithmically
+  faster than MemDep. Currently, GVNHoist (which is off by default) makes use of
+  MemorySSA.
+
 .. NOTE
    For small 1-3 sentence descriptions, just add an entry at the end of
    this list. If your description won't fit comfortably in one bullet