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

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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
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Chandler Carruth 2012-04-17 01:10:35 +00:00
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docs/ReleaseNotes.html
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@ -299,6 +299,8 @@ Release Notes</a>.</h1>
Support to model instruction bundling / packing.</li> Support to model instruction bundling / packing.</li>
<li><a href="#armintegratedassembler">ARM Integrated Assembler</a>, <li><a href="#armintegratedassembler">ARM Integrated Assembler</a>,
A full featured assembler and direct-to-object support for ARM.</li> 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> <li>....</li>
</ul> </ul>
@ -416,6 +418,16 @@ Release Notes</a>.</h1>
</div> </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> <h3>
<a name="x86">X86-32 and X86-64 Target Improvements</a> <a name="x86">X86-32 and X86-64 Target Improvements</a>