Add ThinLTO release note.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_39@277628 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/docs/ReleaseNotes.rst b/docs/ReleaseNotes.rst
index a6c263726d87996148fed9acdd177e7b6b6547aa..a39f87327c07b6b7693be8a0d52799356870e317 100644 (file)
--- a/docs/ReleaseNotes.rst
+++ b/docs/ReleaseNotes.rst
@@ -72,9 +72,6 @@ Non-comprehensive list of changes in this release
   need to be updated to replace the argument node and remove any dead nodes in
   cases where they currently return an ``SDNode *`` from this interface.
 
-* Introduction of ThinLTO: [FIXME: needs to be documented more extensively in
-  /docs/ ; ping Mehdi/Teresa before the release if not done]
-
 * Raised the minimum required CMake version to 3.4.3.
 
 .. NOTE
@@ -139,6 +136,16 @@ link-time may be differently optimized than the one what was visible
 during optimization, and may have arbitrarily different observable
 behavior.  See `PR26774 <http://llvm.org/PR26774>`_ for more details.
 
+Support for ThinLTO
+-------------------
+
+LLVM now supports ThinLTO compilation, which can be invoked by compiling
+and linking with -flto=thin. The gold linker plugin, as well as linkers
+that use the new ThinLTO API in libLTO (like ld64), will transparently
+execute the ThinLTO backends in parallel threads.
+For more information on ThinLTO and the LLVM implementation, see the
+`ThinLTO blog post <http://blog.llvm.org/2016/06/thinlto-scalable-and-incremental-lto.html>`_.
+
 Changes to the ARM Targets
 --------------------------