vendor/llvm/llvm-r104832

1 files changed, 6 insertions, 4 deletions

diff --git a/include/llvm/Constants.h b/include/llvm/Constants.h
index 1cebb2015181..9ca845ec9d72 100644
--- a/include/llvm/Constants.h
+++ b/include/llvm/Constants.h
@@ -691,9 +691,6 @@ public:
   // ConstantExpr class, because they will attempt to fold the constant
   // expression into something simpler if possible.
 
-  /// Cast constant expr
-  ///
-
   /// getAlignOf constant expr - computes the alignment of a type in a target
   /// independent way (Note: the return type is an i64).
   static Constant *getAlignOf(const Type* Ty);
@@ -926,7 +923,11 @@ DEFINE_TRANSPARENT_CASTED_OPERAND_ACCESSORS(ConstantExpr, Constant)
 /// UndefValue - 'undef' values are things that do not have specified contents.
 /// These are used for a variety of purposes, including global variable
 /// initializers and operands to instructions.  'undef' values can occur with
-/// any type.
+/// any first-class type.
+///
+/// Undef values aren't exactly constants; if they have multiple uses, they
+/// can appear to have different bit patterns at each use. See
+/// LangRef.html#undefvalues for details.
 ///
 class UndefValue : public Constant {
   friend struct ConstantCreator<UndefValue, Type, char>;
@@ -957,6 +958,7 @@ public:
     return V->getValueID() == UndefValueVal;
   }
 };
+
 } // End llvm namespace
 
 #endif