Removing LLVM_DELETED_FUNCTION, as MSVC 2012 was the last reason for requiring the...

[oota-llvm.git] / include / llvm / ADT / APFloat.h

diff --git a/include/llvm/ADT/APFloat.h b/include/llvm/ADT/APFloat.h
index a83563a5a6f2d14ec14eab0cf08be9de3e1ca599..bf814e00b16c8babdcbff40e5d942d56e27f6009 100644 (file)
--- a/include/llvm/ADT/APFloat.h
+++ b/include/llvm/ADT/APFloat.h
@@ -376,7 +376,7 @@ public:
   /// The definition of equality is not straightforward for floating point, so
   /// we won't use operator==.  Use one of the following, or write whatever it
   /// is you really mean.
-  bool operator==(const APFloat &) const LLVM_DELETED_FUNCTION;
+  bool operator==(const APFloat &) const = delete;
 
   /// IEEE comparison with another floating point number (NaNs compare
   /// unordered, 0==-0).
@@ -491,6 +491,36 @@ public:
   /// return true.
   bool getExactInverse(APFloat *inv) const;
 
+  /// \brief Enumeration of \c ilogb error results.
+  enum IlogbErrorKinds {
+    IEK_Zero = INT_MIN+1,
+    IEK_NaN = INT_MIN,
+    IEK_Inf = INT_MAX
+  };
+
+  /// \brief Returns the exponent of the internal representation of the APFloat.
+  ///
+  /// Because the radix of APFloat is 2, this is equivalent to floor(log2(x)).
+  /// For special APFloat values, this returns special error codes:
+  ///
+  ///   NaN -> \c IEK_NaN
+  ///   0   -> \c IEK_Zero
+  ///   Inf -> \c IEK_Inf
+  ///
+  friend int ilogb(const APFloat &Arg) {
+    if (Arg.isNaN())
+      return IEK_NaN;
+    if (Arg.isZero())
+      return IEK_Zero;
+    if (Arg.isInfinity())
+      return IEK_Inf;
+
+    return Arg.exponent;
+  }
+
+  /// \brief Returns: X * 2^Exp for integral exponents.
+  friend APFloat scalbn(APFloat X, int Exp);
+
 private:
 
   /// \name Simple Queries
@@ -612,11 +642,41 @@ private:
   unsigned int sign : 1;
 };
 
-/// See friend declaration above.
+/// See friend declarations above.
 ///
-/// This additional declaration is required in order to compile LLVM with IBM
+/// These additional declarations are required in order to compile LLVM with IBM
 /// xlC compiler.
 hash_code hash_value(const APFloat &Arg);
+APFloat scalbn(APFloat X, int Exp);
+
+/// \brief Returns the absolute value of the argument.
+inline APFloat abs(APFloat X) {
+  X.clearSign();
+  return X;
+}
+
+/// Implements IEEE minNum semantics. Returns the smaller of the 2 arguments if
+/// both are not NaN. If either argument is a NaN, returns the other argument.
+LLVM_READONLY
+inline APFloat minnum(const APFloat &A, const APFloat &B) {
+  if (A.isNaN())
+    return B;
+  if (B.isNaN())
+    return A;
+  return (B.compare(A) == APFloat::cmpLessThan) ? B : A;
+}
+
+/// Implements IEEE maxNum semantics. Returns the larger of the 2 arguments if
+/// both are not NaN. If either argument is a NaN, returns the other argument.
+LLVM_READONLY
+inline APFloat maxnum(const APFloat &A, const APFloat &B) {
+  if (A.isNaN())
+    return B;
+  if (B.isNaN())
+    return A;
+  return (A.compare(B) == APFloat::cmpLessThan) ? B : A;
+}
+
 } // namespace llvm
 
 #endif // LLVM_ADT_APFLOAT_H