Explain what this pass does.
llvm-svn: 17146
diff --git a/llvm/lib/Transforms/Instrumentation/EmitFunctions.cpp b/llvm/lib/Transforms/Instrumentation/EmitFunctions.cpp
index 7b624ad..a12f57d 100644
--- a/llvm/lib/Transforms/Instrumentation/EmitFunctions.cpp
+++ b/llvm/lib/Transforms/Instrumentation/EmitFunctions.cpp
@@ -7,7 +7,13 @@
//
//===----------------------------------------------------------------------===//
//
-// This inserts a global constant table with function pointers all along.
+// This inserts into the input module three new global constants containing
+// mapping information pertinent to the Reoptimizer's runtime library:
+// 1) a structure containing a pointer to each function;
+// 2) an array containing a boolean which is true iff the corresponding
+// function in 1) contains a back-edge branch suitable for the Reoptimizer's
+// first-level instrumentation;
+// 3) an integer containing the number of entries in 1) and 2).
//
// NOTE: This pass is used by the reoptimizer only.
//