diff --git a/tools/gccld/GenerateCode.cpp b/tools/gccld/GenerateCode.cpp
index d1a009b..ef07287 100644
--- a/tools/gccld/GenerateCode.cpp
+++ b/tools/gccld/GenerateCode.cpp
@@ -68,6 +68,9 @@
     Passes.add(createInternalizePass());
   }
 
+  // Propagate constants at call sites into the functions they call.
+  Passes.add(createIPConstantPropagationPass());
+
   // Remove unused arguments from functions...
   Passes.add(createDeadArgEliminationPass());