Add convenience functions for creating nsw add operators.

llvm-svn: 78707

7 files changed, 46 insertions, 0 deletions

diff --git a/llvm/include/llvm/Constants.h b/llvm/include/llvm/Constants.h
index 78b3ca83ea7..30b48beb87b 100644
--- a/llvm/include/llvm/Constants.h
+++ b/llvm/include/llvm/Constants.h
@@ -636,6 +636,7 @@ public:
   static Constant *getIntToPtr(Constant *C, const Type *Ty);
   static Constant *getBitCast (Constant *C, const Type *Ty);
 
+  static Constant* getNSWAdd(Constant* C1, Constant* C2);
   static Constant* getExactSDiv(Constant* C1, Constant* C2);
 
   /// Transparently provide more efficient getOperand methods.
diff --git a/llvm/include/llvm/InstrTypes.h b/llvm/include/llvm/InstrTypes.h
index 9df99a7c6fa..ce37521937b 100644
--- a/llvm/include/llvm/InstrTypes.h
+++ b/llvm/include/llvm/InstrTypes.h
@@ -196,6 +196,27 @@ public:
 #include "llvm/Instruction.def"
 
 
+  /// CreateNSWAdd - Create an Add operator with the NSW flag set.
+  ///
+  static BinaryOperator *CreateNSWAdd(Value *V1, Value *V2,
+                                      const Twine &Name = "") {
+    BinaryOperator *BO = CreateAdd(V1, V2, Name);
+    cast<AddOperator>(BO)->setHasNoSignedOverflow(true);
+    return BO;
+  }
+  static BinaryOperator *CreateNSWAdd(Value *V1, Value *V2,
+                                      const Twine &Name, BasicBlock *BB) {
+    BinaryOperator *BO = CreateAdd(V1, V2, Name, BB);
+    cast<AddOperator>(BO)->setHasNoSignedOverflow(true);
+    return BO;
+  }
+  static BinaryOperator *CreateNSWAdd(Value *V1, Value *V2,
+                                      const Twine &Name, Instruction *I) {
+    BinaryOperator *BO = CreateAdd(V1, V2, Name, I);
+    cast<AddOperator>(BO)->setHasNoSignedOverflow(true);
+    return BO;
+  }
+
   /// CreateExactSDiv - Create an SDiv operator with the exact flag set.
   ///
   static BinaryOperator *CreateExactSDiv(Value *V1, Value *V2,
diff --git a/llvm/include/llvm/Support/ConstantFolder.h b/llvm/include/llvm/Support/ConstantFolder.h
index 1b5b2b77459..ef70a898e46 100644
--- a/llvm/include/llvm/Support/ConstantFolder.h
+++ b/llvm/include/llvm/Support/ConstantFolder.h
@@ -35,6 +35,9 @@ public:
   Constant *CreateAdd(Constant *LHS, Constant *RHS) const {
     return ConstantExpr::getAdd(LHS, RHS);
   }
+  Constant *CreateNSWAdd(Constant *LHS, Constant *RHS) const {
+    return ConstantExpr::getNSWAdd(LHS, RHS);
+  }
   Constant *CreateFAdd(Constant *LHS, Constant *RHS) const {
     return ConstantExpr::getFAdd(LHS, RHS);
   }
diff --git a/llvm/include/llvm/Support/IRBuilder.h b/llvm/include/llvm/Support/IRBuilder.h
index 89dd2953daa..2e24d5ec1d6 100644
--- a/llvm/include/llvm/Support/IRBuilder.h
+++ b/llvm/include/llvm/Support/IRBuilder.h
@@ -199,6 +199,12 @@ public:
         return Folder.CreateAdd(LC, RC);
     return Insert(BinaryOperator::CreateAdd(LHS, RHS), Name);
   }
+  Value *CreateNSWAdd(Value *LHS, Value *RHS, const char *Name = "") {
+    if (Constant *LC = dyn_cast<Constant>(LHS))
+      if (Constant *RC = dyn_cast<Constant>(RHS))
+        return Folder.CreateNSWAdd(LC, RC);
+    return Insert(BinaryOperator::CreateNSWAdd(LHS, RHS), Name);
+  }
   Value *CreateFAdd(Value *LHS, Value *RHS, const char *Name = "") {
     if (Constant *LC = dyn_cast<Constant>(LHS))
       if (Constant *RC = dyn_cast<Constant>(RHS))
diff --git a/llvm/include/llvm/Support/NoFolder.h b/llvm/include/llvm/Support/NoFolder.h
index 5333b87efd1..4540f028cee 100644
--- a/llvm/include/llvm/Support/NoFolder.h
+++ b/llvm/include/llvm/Support/NoFolder.h
@@ -42,6 +42,9 @@ public:
   Value *CreateAdd(Constant *LHS, Constant *RHS) const {
     return BinaryOperator::CreateAdd(LHS, RHS);
   }
+  Value *CreateNSWAdd(Constant *LHS, Constant *RHS) const {
+    return BinaryOperator::CreateNSWAdd(LHS, RHS);
+  }
   Value *CreateFAdd(Constant *LHS, Constant *RHS) const {
     return BinaryOperator::CreateFAdd(LHS, RHS);
   }
diff --git a/llvm/include/llvm/Support/TargetFolder.h b/llvm/include/llvm/Support/TargetFolder.h
index 2569cb90197..77533c00b13 100644
--- a/llvm/include/llvm/Support/TargetFolder.h
+++ b/llvm/include/llvm/Support/TargetFolder.h
@@ -51,6 +51,9 @@ public:
   Constant *CreateAdd(Constant *LHS, Constant *RHS) const {
     return Fold(ConstantExpr::getAdd(LHS, RHS));
   }
+  Constant *CreateNSWAdd(Constant *LHS, Constant *RHS) const {
+    return Fold(ConstantExpr::getNSWAdd(LHS, RHS));
+  }
   Constant *CreateFAdd(Constant *LHS, Constant *RHS) const {
     return Fold(ConstantExpr::getFAdd(LHS, RHS));
   }
diff --git a/llvm/lib/VMCore/Constants.cpp b/llvm/lib/VMCore/Constants.cpp
index d71dc2cf710..0bff5786b83 100644
--- a/llvm/lib/VMCore/Constants.cpp
+++ b/llvm/lib/VMCore/Constants.cpp
@@ -605,6 +605,15 @@ Constant* ConstantVector::get(Constant* const* Vals, unsigned NumVals) {
   return get(std::vector<Constant*>(Vals, Vals+NumVals));
 }
 
+Constant* ConstantExpr::getNSWAdd(Constant* C1, Constant* C2) {
+  Constant *C = getAdd(C1, C2);
+  // Set nsw attribute, assuming constant folding didn't eliminate the
+  // Add.
+  if (AddOperator *Add = dyn_cast<AddOperator>(C))
+    Add->setHasNoSignedOverflow(true);
+  return C;
+}
+
 Constant* ConstantExpr::getExactSDiv(Constant* C1, Constant* C2) {
   Constant *C = getSDiv(C1, C2);
   // Set exact attribute, assuming constant folding didn't eliminate the