1 files changed, 5 insertions, 1 deletions
diff --git a/lib/VMCore/ConstantFold.h b/lib/VMCore/ConstantFold.h
index ef19cd2..a27283c 100644
--- a/lib/VMCore/ConstantFold.h
+++ b/lib/VMCore/ConstantFold.h
@@ -134,11 +134,15 @@ private:
 
 // Unary operators...
 inline Constant *operator~(const Constant &V) {
-  assert(V.getType()->isIntegral() && "Cannot invert non-intergral constant!");
+  assert(V.getType()->isIntegral() && "Cannot invert non-integral constant!");
   return ConstRules::get(V, V)->op_xor(&V,
                                     ConstantInt::getAllOnesValue(V.getType()));
 }
 
+inline Constant *operator-(const Constant &V) {
+  return ConstRules::get(V, V)->sub(Constant::getNullValue(V.getType()), &V);
+}
+
 // Standard binary operators...
 inline Constant *operator+(const Constant &V1, const Constant &V2) {
   assert(V1.getType() == V2.getType() && "Constant types must be identical!");