PR5207: Make APInt::set(), APInt::clear() and APInt::flip() return void.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120413 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/ADT/APInt.h

@@ -379,12 +379,17 @@ public:
   /// @{
   /// @brief Gets maximum unsigned value of APInt for specific bit width.
   static APInt getMaxValue(unsigned numBits) {
-    return APInt(numBits, 0).set();
+    APInt API(numBits, 0);
+    API.set();
+    return API;
   }
 
   /// @brief Gets maximum signed value of APInt for a specific bit width.
   static APInt getSignedMaxValue(unsigned numBits) {
-    return APInt(numBits, 0).set().clear(numBits - 1);
+    APInt API(numBits, 0);
+    API.set();
+    API.clear(numBits - 1);
+    return API;
   }
 
   /// @brief Gets minimum unsigned value of APInt for a specific bit width.
@@ -394,7 +399,9 @@ public:
 
   /// @brief Gets minimum signed value of APInt for a specific bit width.
   static APInt getSignedMinValue(unsigned numBits) {
-    return APInt(numBits, 0).set(numBits - 1);
+    APInt API(numBits, 0);
+    API.set(numBits - 1);
+    return API;
   }
 
   /// getSignBit - This is just a wrapper function of getSignedMinValue(), and
@@ -407,7 +414,9 @@ public:
   /// @returns the all-ones value for an APInt of the specified bit-width.
   /// @brief Get the all-ones value.
   static APInt getAllOnesValue(unsigned numBits) {
-    return APInt(numBits, 0).set();
+    APInt API(numBits, 0);
+    API.set();
+    return API;
   }
 
   /// @returns the '0' value for an APInt of the specified bit-width.
@@ -1035,51 +1044,49 @@ public:
   /// @name Bit Manipulation Operators
   /// @{
   /// @brief Set every bit to 1.
-  APInt &set() {
-    if (isSingleWord()) {
+  void set() {
+    if (isSingleWord())
       VAL = -1ULL;
-      return clearUnusedBits();
+    else {
+      // Set all the bits in all the words.
+      for (unsigned i = 0; i < getNumWords(); ++i)
+	pVal[i] = -1ULL;
     }
-
-    // Set all the bits in all the words.
-    for (unsigned i = 0; i < getNumWords(); ++i)
-      pVal[i] = -1ULL;
     // Clear the unused ones
-    return clearUnusedBits();
+    clearUnusedBits();
   }
 
   /// Set the given bit to 1 whose position is given as "bitPosition".
   /// @brief Set a given bit to 1.
-  APInt &set(unsigned bitPosition);
+  void set(unsigned bitPosition);
 
   /// @brief Set every bit to 0.
-  APInt &clear() {
+  void clear() {
     if (isSingleWord())
       VAL = 0;
     else
       memset(pVal, 0, getNumWords() * APINT_WORD_SIZE);
-    return *this;
   }
 
   /// Set the given bit to 0 whose position is given as "bitPosition".
   /// @brief Set a given bit to 0.
-  APInt &clear(unsigned bitPosition);
+  void clear(unsigned bitPosition);
 
   /// @brief Toggle every bit to its opposite value.
-  APInt &flip() {
-    if (isSingleWord()) {
+  void flip() {
+    if (isSingleWord())
       VAL ^= -1ULL;
-      return clearUnusedBits();
+    else {
+      for (unsigned i = 0; i < getNumWords(); ++i)
+        pVal[i] ^= -1ULL;
     }
-    for (unsigned i = 0; i < getNumWords(); ++i)
-      pVal[i] ^= -1ULL;
-    return clearUnusedBits();
+    clearUnusedBits();
   }
 
   /// Toggle a given bit to its opposite value whose position is given
   /// as "bitPosition".
   /// @brief Toggles a given bit to its opposite value.
-  APInt& flip(unsigned bitPosition);
+  void flip(unsigned bitPosition);
 
   /// @}
   /// @name Value Characterization Functions

lib/Analysis/ValueTracking.cpp

@@ -875,8 +875,9 @@ bool llvm::ComputeMultiple(Value *V, unsigned Base, Value *&Multiple,
       // Turn Op0 << Op1 into Op0 * 2^Op1
       APInt Op1Int = Op1CI->getValue();
       uint64_t BitToSet = Op1Int.getLimitedValue(Op1Int.getBitWidth() - 1);
-      Op1 = ConstantInt::get(V->getContext(), 
-                             APInt(Op1Int.getBitWidth(), 0).set(BitToSet));
+      APInt API(Op1Int.getBitWidth(), 0);
+      API.set(BitToSet);
+      Op1 = ConstantInt::get(V->getContext(), API);
     }
 
     Value *Mul0 = NULL;

lib/CodeGen/SelectionDAG/LegalizeFloatTypes.cpp

@@ -133,8 +133,9 @@ SDValue DAGTypeLegalizer::SoftenFloatRes_FABS(SDNode *N) {
   unsigned Size = NVT.getSizeInBits();
 
   // Mask = ~(1 << (Size-1))
-  SDValue Mask = DAG.getConstant(APInt::getAllOnesValue(Size).clear(Size-1),
-                                 NVT);
+  APInt API = APInt::getAllOnesValue(Size);
+  API.clear(Size-1);
+  SDValue Mask = DAG.getConstant(API, NVT);
   SDValue Op = GetSoftenedFloat(N->getOperand(0));
   return DAG.getNode(ISD::AND, N->getDebugLoc(), NVT, Op, Mask);
 }

lib/Support/APInt.cpp

@@ -584,22 +584,20 @@ bool APInt::slt(const APInt& RHS) const {
     return lhs.ult(rhs);
 }
 
-APInt& APInt::set(unsigned bitPosition) {
+void APInt::set(unsigned bitPosition) {
   if (isSingleWord())
     VAL |= maskBit(bitPosition);
   else
     pVal[whichWord(bitPosition)] |= maskBit(bitPosition);
-  return *this;
 }
 
 /// Set the given bit to 0 whose position is given as "bitPosition".
 /// @brief Set a given bit to 0.
-APInt& APInt::clear(unsigned bitPosition) {
+void APInt::clear(unsigned bitPosition) {
   if (isSingleWord())
     VAL &= ~maskBit(bitPosition);
   else
     pVal[whichWord(bitPosition)] &= ~maskBit(bitPosition);
-  return *this;
 }
 
 /// @brief Toggle every bit to its opposite value.
@@ -607,11 +605,10 @@ APInt& APInt::clear(unsigned bitPosition) {
 /// Toggle a given bit to its opposite value whose position is given
 /// as "bitPosition".
 /// @brief Toggles a given bit to its opposite value.
-APInt& APInt::flip(unsigned bitPosition) {
+void APInt::flip(unsigned bitPosition) {
   assert(bitPosition < BitWidth && "Out of the bit-width range!");
   if ((*this)[bitPosition]) clear(bitPosition);
   else set(bitPosition);
-  return *this;
 }
 
 unsigned APInt::getBitsNeeded(StringRef str, uint8_t radix) {