ReleaseNotes: ADCE; patch by David Callahan

git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_40@294797 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/docs/ReleaseNotes.rst b/docs/ReleaseNotes.rst
index 4c6bd1807afffe8a576cd244d3419d43c29e8d31..12ce7939878abb65e8d3de9dac2a6fc536848036 100644 (file)
--- a/docs/ReleaseNotes.rst
+++ b/docs/ReleaseNotes.rst
@@ -55,6 +55,12 @@ Non-comprehensive list of changes in this release
 * LLVM now handles invariant.group across different basic blocks, which makes
   it possible to devirtualize virtual calls inside loops.
 
+* The aggressive dead code elimination phase ("adce") now remove
+  branches which do not effect program behavior. Loops are retained by
+  default since they may be infinite but these can also be removed
+  with LLVM option -adce-remove-loops when the loop body otherwise has
+  no live operations.
+
 * ... next change ...
 
 .. NOTE