Document llvm/ADT/IntEqClasses.h in ProgrammersManual.html

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128927 91177308-0d34-0410-b5e6-96231b3b80d8

docs/ProgrammersManual.html

@@ -86,6 +86,7 @@ option</a></li>
       <li><a href="#dss_valuemap">"llvm/ADT/ValueMap.h"</a></li>
       <li><a href="#dss_intervalmap">"llvm/ADT/IntervalMap.h"</a></li>
       <li><a href="#dss_map">&lt;map&gt;</a></li>
+      <li><a href="#dss_inteqclasses">"llvm/ADT/IntEqClasses.h"</a></li>
       <li><a href="#dss_othermap">Other Map-Like Container Options</a></li>
     </ul></li>
     <li><a href="#ds_string">String-like containers</a>
@@ -1545,6 +1546,26 @@ another element takes place).</p>
 
 </div>
 
+<!-- _______________________________________________________________________ -->
+<div class="doc_subsubsection">
+  <a name="dss_inteqclasses">"llvm/ADT/IntEqClasses.h"</a>
+</div>
+
+<div class="doc_text">
+
+<p>IntEqClasses provides a compact representation of equivalence classes of
+small integers. Initially, each integer in the range 0..n-1 has its own
+equivalence class. Classes can be joined by passing two class representatives to
+the join(a, b) method. Two integers are in the same class when findLeader()
+returns the same representative.</p>
+
+<p>Once all equivalence classes are formed, the map can be compressed so each
+integer 0..n-1 maps to an equivalence class number in the range 0..m-1, where m
+is the total number of equivalence classes. The map must be uncompressed before
+it can be edited again.</p>
+
+</div>
+
 <!-- _______________________________________________________________________ -->
 <div class="doc_subsubsection">
   <a name="dss_othermap">Other Map-Like Container Options</a>