APInt: Simplify code.

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

diff --git a/include/llvm/ADT/APInt.h b/include/llvm/ADT/APInt.h
index 82338ed9cb669a2f88f96e0e91affb2130552c7b..f30a6e3f081cd35a6f7f47b111a4063962215900 100644 (file)
--- a/include/llvm/ADT/APInt.h
+++ b/include/llvm/ADT/APInt.h
@@ -16,6 +16,7 @@
 #define LLVM_APINT_H
 
 #include "llvm/ADT/ArrayRef.h"
+#include "llvm/Support/Compiler.h"
 #include "llvm/Support/MathExtras.h"
 #include <cassert>
 #include <climits>
@@ -23,11 +24,12 @@
 #include <string>
 
 namespace llvm {
-  class Serializer;
   class Deserializer;
   class FoldingSetNodeID;
-  class raw_ostream;
+  class Serializer;
   class StringRef;
+  class hash_code;
+  class raw_ostream;
 
   template<typename T>
   class SmallVectorImpl;
@@ -272,6 +274,13 @@ public:
       initSlowCase(that);
   }
 
+#if LLVM_USE_RVALUE_REFERENCES
+  /// @brief Move Constructor.
+  APInt(APInt&& that) : BitWidth(that.BitWidth), VAL(that.VAL) {
+    that.BitWidth = 0;
+  }
+#endif
+
   /// @brief Destructor.
   ~APInt() {
     if (!isSingleWord())
@@ -348,13 +357,7 @@ public:
   /// @brief Check if this APInt has an N-bits unsigned integer value.
   bool isIntN(unsigned N) const {
     assert(N && "N == 0 ???");
-    if (N >= getBitWidth())
-      return true;
-
-    if (isSingleWord())
-      return isUIntN(N, VAL);
-    return APInt(N, makeArrayRef(pVal, getNumWords())).zext(getBitWidth())
-      == (*this);
+    return getActiveBits() <= N;
   }
 
   /// @brief Check if this APInt has an N-bits signed integer value.
@@ -502,10 +505,20 @@ public:
     return getAllOnesValue(numBits).lshr(numBits - loBitsSet);
   }
 
-  /// The hash value is computed as the sum of the words and the bit width.
-  /// @returns A hash value computed from the sum of the APInt words.
-  /// @brief Get a hash value based on this APInt
-  uint64_t getHashValue() const;
+  /// \brief Determine if two APInts have the same value, after zero-extending
+  /// one of them (if needed!) to ensure that the bit-widths match.
+  static bool isSameValue(const APInt &I1, const APInt &I2) {
+    if (I1.getBitWidth() == I2.getBitWidth())
+      return I1 == I2;
+
+    if (I1.getBitWidth() > I2.getBitWidth())
+      return I1 == I2.zext(I1.getBitWidth());
+
+    return I1.zext(I2.getBitWidth()) == I2;
+  }
+  
+  /// \brief Overload to compute a hash_code for an APInt value.
+  friend hash_code hash_value(const APInt &Arg);
 
   /// This function returns a pointer to the internal storage of the APInt.
   /// This is useful for writing out the APInt in binary form without any
@@ -562,7 +575,15 @@ public:
   /// Performs logical negation operation on this APInt.
   /// @returns true if *this is zero, false otherwise.
   /// @brief Logical negation operator.
-  bool operator!() const;
+  bool operator!() const {
+    if (isSingleWord())
+      return !VAL;
+
+    for (unsigned i = 0; i != getNumWords(); ++i)
+      if (pVal[i])
+        return false;
+    return true;
+  }
 
   /// @}
   /// @name Assignment Operators
@@ -580,6 +601,21 @@ public:
     return AssignSlowCase(RHS);
   }
 
+#if LLVM_USE_RVALUE_REFERENCES
+  /// @brief Move assignment operator.
+  APInt& operator=(APInt&& that) {
+    if (!isSingleWord())
+      delete [] pVal;
+
+    BitWidth = that.BitWidth;
+    VAL = that.VAL;
+
+    that.BitWidth = 0;
+
+    return *this;
+  }
+#endif
+
   /// The RHS value is assigned to *this. If the significant bits in RHS exceed
   /// the bit width, the excess bits are truncated. If the bit width is larger
   /// than 64, the value is zero filled in the unspecified high order bits.
@@ -810,9 +846,10 @@ public:
     if (LHS.isNegative()) {
       if (RHS.isNegative())
         APInt::udivrem(-LHS, -RHS, Quotient, Remainder);
-      else
+      else {
         APInt::udivrem(-LHS, RHS, Quotient, Remainder);
-      Quotient = -Quotient;
+        Quotient = -Quotient;
+      }
       Remainder = -Remainder;
     } else if (RHS.isNegative()) {
       APInt::udivrem(LHS, -RHS, Quotient, Remainder);
@@ -835,7 +872,11 @@ public:
 
   /// @returns the bit value at bitPosition
   /// @brief Array-indexing support.
-  bool operator[](unsigned bitPosition) const;
+  bool operator[](unsigned bitPosition) const {
+    assert(bitPosition < getBitWidth() && "Bit position out of bounds!");
+    return (maskBit(bitPosition) &
+            (isSingleWord() ? VAL : pVal[whichWord(bitPosition)])) != 0;
+  }
 
   /// @}
   /// @name Comparison Operators
@@ -1076,7 +1117,7 @@ public:
     else {
       // Set all the bits in all the words.
       for (unsigned i = 0; i < getNumWords(); ++i)
-       pVal[i] = -1ULL;
+        pVal[i] = -1ULL;
     }
     // Clear the unused ones
     clearUnusedBits();