[RelNotes,ARM] Mention improved ARM/Thumb codegen and LTO.

Reviewers: echristo, rengolin, kristof.beyls, hans, t.p.northover

Reviewed By: hans

Subscribers: aemerson, inglorion, llvm-commits

Differential Revision: https://reviews.llvm.org/D36968

git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_50@311460 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/docs/ReleaseNotes.rst b/docs/ReleaseNotes.rst
index 48af491f12143a611395d956146faa82bf657c78..8b6a703d81adfd27ee65069cd3ca56fdb32e9648 100644 (file)
--- a/docs/ReleaseNotes.rst
+++ b/docs/ReleaseNotes.rst
@@ -77,11 +77,15 @@ Changes to the LLVM IR
 * Added speculatable attribute indicating a function which does has no
   side-effects which could inhibit hoisting of calls.
 
-Changes to the ARM Backend
+Changes to the Arm Targets
 --------------------------
 
- During this release ...
+During this release the ARM target has:
 
+* Improved mixed ARM/Thumb code generation. Some cases in which wrong
+  relocations were emitted have been fixed.
+* Added initial support for mixed ARM/Thumb link-time optimization, using the
+  thumb-mode target feature.
 
 Changes to the MIPS Target
 --------------------------