As requested, a blurb on sub-targets.
llvm-svn: 23769
diff --git a/llvm/docs/CodeGenerator.html b/llvm/docs/CodeGenerator.html
index 39eecc1..0e63fac 100644
--- a/llvm/docs/CodeGenerator.html
+++ b/llvm/docs/CodeGenerator.html
@@ -444,7 +444,11 @@
<div class="doc_text">
<p>
- TODO
+ <p>The <tt>TargetSubtarget</tt> class is used to provide information about the
+ specific chip set being targeted. A sub-target informs code generation of
+ which instructions are supported, instruction latencies and instruction
+ execution itinerary; i.e., which processing units are used, in what order, and
+ for how long.
</p>
</div>