Add a stub for block placement pass. This needs fleshing out w/ details

about what folks should expect w.r.t. the new algorithm.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154891 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/docs/ReleaseNotes.html b/docs/ReleaseNotes.html
index c2bd881c96fe29d5da2faae7058230745246ac08..22ceb7417b9035a5990d610dafd0742c5417272f 100644 (file)
--- a/docs/ReleaseNotes.html
+++ b/docs/ReleaseNotes.html
@@ -299,6 +299,8 @@ Release Notes</a>.</h1>
       Support to model instruction bundling / packing.</li>
   <li><a href="#armintegratedassembler">ARM Integrated Assembler</a>,
       A full featured assembler and direct-to-object support for ARM.</li>
+  <li><a href="#blockplacement">Basic Block Placement</a>
+      Probability driven basic block placement.</li>
   <li>....</li>
 </ul>
 
@@ -416,6 +418,16 @@ Release Notes</a>.</h1>
 
 </div>
 
+<h4>
+<a name="blockplacement">Basic Block Placement</a>
+</h4>
+<div>
+<p>A probability based block placement and code layout algorithm was added to
+LLVM's code generator. This layout pass supports probabilities derived from
+static heuristics as well as source code annotations such as
+<code>__builtin_expect</code>.</p>
+</div>
+
 <!--=========================================================================-->
 <h3>
 <a name="x86">X86-32 and X86-64 Target Improvements</a>