PR5207: Change APInt methods trunc(), sext(), zext(), sextOrTrunc() and
zextOrTrunc(), and APSInt methods extend(), extOrTrunc() and new method
trunc(), to be const and to return a new value instead of modifying the
object in place.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@121121 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/ASTContext.cpp b/lib/AST/ASTContext.cpp
index 9a8b153..d7dedc6 100644
--- a/lib/AST/ASTContext.cpp
+++ b/lib/AST/ASTContext.cpp
@@ -1422,7 +1422,8 @@
   // Convert the array size into a canonical width matching the pointer size for
   // the target.
   llvm::APInt ArySize(ArySizeIn);
-  ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace()));
+  ArySize =
+    ArySize.zextOrTrunc(Target.getPointerWidth(EltTy.getAddressSpace()));
 
   llvm::FoldingSetNodeID ID;
   ConstantArrayType::Profile(ID, EltTy, ArySize, ASM, EltTypeQuals);
diff --git a/lib/AST/ASTImporter.cpp b/lib/AST/ASTImporter.cpp
index 13b89e1..ffebbf3 100644
--- a/lib/AST/ASTImporter.cpp
+++ b/lib/AST/ASTImporter.cpp
@@ -212,9 +212,9 @@
     return I1 == I2;
   
   if (I1.getBitWidth() > I2.getBitWidth())
-    return I1 == llvm::APInt(I2).zext(I1.getBitWidth());
+    return I1 == I2.zext(I1.getBitWidth());
   
-  return llvm::APInt(I1).zext(I2.getBitWidth()) == I2;
+  return I1.zext(I2.getBitWidth()) == I2;
 }
 
 /// \brief Determine if two APSInts have the same value, zero- or sign-extending
@@ -225,9 +225,9 @@
   
   // Check for a bit-width mismatch.
   if (I1.getBitWidth() > I2.getBitWidth())
-    return IsSameValue(I1, llvm::APSInt(I2).extend(I1.getBitWidth()));
+    return IsSameValue(I1, I2.extend(I1.getBitWidth()));
   else if (I2.getBitWidth() > I1.getBitWidth())
-    return IsSameValue(llvm::APSInt(I1).extend(I2.getBitWidth()), I2);
+    return IsSameValue(I1.extend(I2.getBitWidth()), I2);
   
   // We have a signedness mismatch. Turn the signed value into an unsigned 
   // value.
diff --git a/lib/AST/ExprConstant.cpp b/lib/AST/ExprConstant.cpp
index 7479d9d..4599818 100644
--- a/lib/AST/ExprConstant.cpp
+++ b/lib/AST/ExprConstant.cpp
@@ -220,7 +220,7 @@
   APSInt Result = Value;
   // Figure out if this is a truncate, extend or noop cast.
   // If the input is signed, do a sign extend, noop, or truncate.
-  Result.extOrTrunc(DestWidth);
+  Result = Result.extOrTrunc(DestWidth);
   Result.setIsUnsigned(DestType->isUnsignedIntegerType());
   return Result;
 }
@@ -587,7 +587,7 @@
       break;
 
     if (Value.isInt()) {
-      Value.getInt().extOrTrunc((unsigned)Info.Ctx.getTypeSize(E->getType()));
+      Value.getInt() = Value.getInt().extOrTrunc((unsigned)Info.Ctx.getTypeSize(E->getType()));
       Result.Base = 0;
       Result.Offset = CharUnits::fromQuantity(Value.getInt().getZExtValue());
       return true;
@@ -731,8 +731,7 @@
 
   llvm::SmallVector<APValue, 4> Elts;
   for (unsigned i = 0; i != NElts; ++i) {
-    APSInt Tmp = Init;
-    Tmp.extOrTrunc(EltWidth);
+    APSInt Tmp = Init.extOrTrunc(EltWidth);
 
     if (EltTy->isIntegerType())
       Elts.push_back(APValue(Tmp));
diff --git a/lib/AST/Type.cpp b/lib/AST/Type.cpp
index cdcaa52..489f766 100644
--- a/lib/AST/Type.cpp
+++ b/lib/AST/Type.cpp
@@ -41,7 +41,8 @@
                                                const llvm::APInt &NumElements) {
   llvm::APSInt SizeExtended(NumElements, true);
   unsigned SizeTypeBits = Context.getTypeSize(Context.getSizeType());
-  SizeExtended.extend(std::max(SizeTypeBits, SizeExtended.getBitWidth()) * 2);
+  SizeExtended = SizeExtended.extend(std::max(SizeTypeBits,
+                                              SizeExtended.getBitWidth()) * 2);
 
   uint64_t ElementSize
     = Context.getTypeSizeInChars(ElementType).getQuantity();