X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FConstants.h;h=a75aaf72a309c4889cf93cb071ac026ccf3def54;hb=0cf15d61b7e3bf53f5a99f58ada37b93bc039559;hp=4b356067998d842c13fe7d01724760a1eb1ddf53;hpb=d75ff3104c2298ecb4abb18fb4bfc3f20a9099f8;p=oota-llvm.git

diff --git a/include/llvm/Constants.h b/include/llvm/Constants.h
index 4b356067998..a75aaf72a30 100644
--- a/include/llvm/Constants.h
+++ b/include/llvm/Constants.h
@@ -25,7 +25,6 @@
 #include "llvm/OperandTraits.h"
 #include "llvm/ADT/APInt.h"
 #include "llvm/ADT/APFloat.h"
-#include "llvm/ADT/SmallVector.h"
 #include <vector>
 
 namespace llvm {
@@ -40,6 +39,8 @@ template<class ConstantClass, class TypeClass, class ValType>
 struct ConstantCreator;
 template<class ConstantClass, class TypeClass>
 struct ConvertConstantType;
+template<typename T, unsigned N>
+class SmallVector;
 
 //===----------------------------------------------------------------------===//
 /// This is the shared class of boolean and integer constants. This class 
@@ -275,6 +276,12 @@ public:
     return Val.isZero() && Val.isNegative();
   }
 
+  /// isZero - Return true if the value is positive or negative zero.
+  bool isZero() const { return Val.isZero(); }
+
+  /// isNaN - Return true if the value is a NaN.
+  bool isNaN() const { return Val.isNaN(); }
+
   /// isExactlyValue - We don't rely on operator== working on double values, as
   /// it returns true for things that are clearly not equal, like -0.0 and 0.0.
   /// As such, this method can be used to do an exact bit-for-bit comparison of
@@ -452,6 +459,7 @@ struct OperandTraits<ConstantStruct> : public VariadicOperandTraits<> {
 
 DEFINE_TRANSPARENT_CASTED_OPERAND_ACCESSORS(ConstantStruct, Constant)
 
+
 //===----------------------------------------------------------------------===//
 /// ConstantVector - Constant Vector Declarations
 ///
@@ -640,15 +648,13 @@ 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);
   
-  /// getSizeOf constant expr - computes the size of a type in a target
-  /// independent way (Note: the return type is an i64).
+  /// getSizeOf constant expr - computes the (alloc) size of a type (in
+  /// address-units, not bits) in a target independent way (Note: the return
+  /// type is an i64).
   ///
   static Constant *getSizeOf(const Type* Ty);
 
@@ -697,10 +703,13 @@ public:
   static Constant *getBitCast (Constant *C, const Type *Ty);
 
   static Constant *getNSWNeg(Constant *C);
+  static Constant *getNUWNeg(Constant *C);
   static Constant *getNSWAdd(Constant *C1, Constant *C2);
+  static Constant *getNUWAdd(Constant *C1, Constant *C2);
   static Constant *getNSWSub(Constant *C1, Constant *C2);
-  static Constant *getNUWMul(Constant *C1, Constant *C2);
+  static Constant *getNUWSub(Constant *C1, Constant *C2);
   static Constant *getNSWMul(Constant *C1, Constant *C2);
+  static Constant *getNUWMul(Constant *C1, Constant *C2);
   static Constant *getExactSDiv(Constant *C1, Constant *C2);
 
   /// Transparently provide more efficient getOperand methods.
@@ -871,7 +880,11 @@ 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>;
@@ -902,6 +915,7 @@ public:
     return V->getValueID() == UndefValueVal;
   }
 };
+
 } // End llvm namespace
 
 #endif