diff --git a/include/llvm/Function.h b/include/llvm/Function.h
index 28c301fe2f6..5dd8502d3ab 100644
--- a/include/llvm/Function.h
+++ b/include/llvm/Function.h
@@ -170,6 +170,9 @@ public:
   bool paramHasAttr(unsigned i, ParameterAttributes attr) const {
     return ParamAttrs.paramHasAttr(i, attr);
   }
+
+  /// addParamAttr - adds the attribute to the list of attributes.
+  void addParamAttr(unsigned i, ParameterAttributes attr);
   
   /// @brief Extract the alignment for a call or parameter (0=unknown).
   unsigned getParamAlignment(unsigned i) const {
diff --git a/include/llvm/Instructions.h b/include/llvm/Instructions.h
index ba46b2031e0..1bd2cba2195 100644
--- a/include/llvm/Instructions.h
+++ b/include/llvm/Instructions.h
@@ -1109,6 +1109,9 @@ public:
 
   /// setParamAttrs - Sets the parameter attributes for this call.
   void setParamAttrs(const PAListPtr &Attrs) { ParamAttrs = Attrs; }
+  
+  /// addParamAttr - adds the attribute to the list of attributes.
+  void addParamAttr(unsigned i, ParameterAttributes attr);
 
   /// @brief Determine whether the call or the callee has the given attribute.
   bool paramHasAttr(unsigned i, unsigned attr) const;
@@ -2428,6 +2431,9 @@ public:
 
   /// @brief Determine whether the call or the callee has the given attribute.
   bool paramHasAttr(unsigned i, ParameterAttributes attr) const;
+  
+  /// addParamAttr - adds the attribute to the list of attributes.
+  void addParamAttr(unsigned i, ParameterAttributes attr);
 
   /// @brief Extract the alignment for a call or parameter (0=unknown).
   unsigned getParamAlignment(unsigned i) const {
diff --git a/lib/VMCore/Function.cpp b/lib/VMCore/Function.cpp
index 9f7eefe1a6b..49e69e1b2c1 100644
--- a/lib/VMCore/Function.cpp
+++ b/lib/VMCore/Function.cpp
@@ -240,6 +240,12 @@ void Function::setDoesNotThrow(bool doesNotThrow) {
   setParamAttrs(PAL);
 }
 
+void Function::addParamAttr(unsigned i, ParameterAttributes attr) {
+  PAListPtr PAL = getParamAttrs();
+  PAL = PAL.addAttr(i, attr);
+  setParamAttrs(PAL);
+}
+
 // Maintain the collector name for each function in an on-the-side table. This
 // saves allocating an additional word in Function for programs which do not use
 // GC (i.e., most programs) at the cost of increased overhead for clients which
diff --git a/lib/VMCore/Instructions.cpp b/lib/VMCore/Instructions.cpp
index ff3b8b546f0..40eea138350 100644
--- a/lib/VMCore/Instructions.cpp
+++ b/lib/VMCore/Instructions.cpp
@@ -373,6 +373,12 @@ CallInst::CallInst(const CallInst &CI)
     OL[i].init(InOL[i], this);
 }
 
+void CallInst::addParamAttr(unsigned i, ParameterAttributes attr) {
+  PAListPtr PAL = getParamAttrs();
+  PAL = PAL.addAttr(i, attr);
+  setParamAttrs(PAL);
+}
+
 bool CallInst::paramHasAttr(unsigned i, ParameterAttributes attr) const {
   if (ParamAttrs.paramHasAttr(i, attr))
     return true;
@@ -449,6 +455,12 @@ bool InvokeInst::paramHasAttr(unsigned i, ParameterAttributes attr) const {
   return false;
 }
 
+void InvokeInst::addParamAttr(unsigned i, ParameterAttributes attr) {
+  PAListPtr PAL = getParamAttrs();
+  PAL = PAL.addAttr(i, attr);
+  setParamAttrs(PAL);
+}
+
 void InvokeInst::setDoesNotThrow(bool doesNotThrow) {
   PAListPtr PAL = getParamAttrs();
   if (doesNotThrow)