Add utility routines for creating integer negation operators with NSW set.

Integer negation only overflows with INT_MIN, but that's an important case.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91662 91177308-0d34-0410-b5e6-96231b3b80d8

6 files changed, 19 insertions, 0 deletions

diff --git a/include/llvm/Constants.h b/include/llvm/Constants.h
index caa13f6ac6..7440f99c50 100644
--- a/include/llvm/Constants.h
+++ b/include/llvm/Constants.h
@@ -692,6 +692,7 @@ public:
   static Constant *getIntToPtr(Constant *C, const Type *Ty);
   static Constant *getBitCast (Constant *C, const Type *Ty);
 
+  static Constant *getNSWNeg(Constant *C);
   static Constant *getNSWAdd(Constant *C1, Constant *C2);
   static Constant *getNSWSub(Constant *C1, Constant *C2);
   static Constant *getExactSDiv(Constant *C1, Constant *C2);
diff --git a/include/llvm/InstrTypes.h b/include/llvm/InstrTypes.h
index bc899699d9..b25290226b 100644
--- a/include/llvm/InstrTypes.h
+++ b/include/llvm/InstrTypes.h
@@ -308,6 +308,10 @@ public:
                                    Instruction *InsertBefore = 0);
   static BinaryOperator *CreateNeg(Value *Op, const Twine &Name,
                                    BasicBlock *InsertAtEnd);
+  static BinaryOperator *CreateNSWNeg(Value *Op, const Twine &Name = "",
+                                      Instruction *InsertBefore = 0);
+  static BinaryOperator *CreateNSWNeg(Value *Op, const Twine &Name,
+                                      BasicBlock *InsertAtEnd);
   static BinaryOperator *CreateFNeg(Value *Op, const Twine &Name = "",
                                     Instruction *InsertBefore = 0);
   static BinaryOperator *CreateFNeg(Value *Op, const Twine &Name,
diff --git a/include/llvm/Support/ConstantFolder.h b/include/llvm/Support/ConstantFolder.h
index b73cea04ab..eea33dfff6 100644
--- a/include/llvm/Support/ConstantFolder.h
+++ b/include/llvm/Support/ConstantFolder.h
@@ -109,6 +109,9 @@ public:
   Constant *CreateNeg(Constant *C) const {
     return ConstantExpr::getNeg(C);
   }
+  Constant *CreateNSWNeg(Constant *C) const {
+    return ConstantExpr::getNSWNeg(C);
+  }
   Constant *CreateFNeg(Constant *C) const {
     return ConstantExpr::getFNeg(C);
   }
diff --git a/include/llvm/Support/IRBuilder.h b/include/llvm/Support/IRBuilder.h
index 1310d70545..22b05d6a10 100644
--- a/include/llvm/Support/IRBuilder.h
+++ b/include/llvm/Support/IRBuilder.h
@@ -478,6 +478,11 @@ public:
       return Folder.CreateNeg(VC);
     return Insert(BinaryOperator::CreateNeg(V), Name);
   }
+  Value *CreateNSWNeg(Value *V, const Twine &Name = "") {
+    if (Constant *VC = dyn_cast<Constant>(V))
+      return Folder.CreateNSWNeg(VC);
+    return Insert(BinaryOperator::CreateNSWNeg(V), Name);
+  }
   Value *CreateFNeg(Value *V, const Twine &Name = "") {
     if (Constant *VC = dyn_cast<Constant>(V))
       return Folder.CreateFNeg(VC);
diff --git a/include/llvm/Support/NoFolder.h b/include/llvm/Support/NoFolder.h
index 7f2f1497f3..f6f4c5b3c8 100644
--- a/include/llvm/Support/NoFolder.h
+++ b/include/llvm/Support/NoFolder.h
@@ -115,6 +115,9 @@ public:
   Value *CreateNeg(Constant *C) const {
     return BinaryOperator::CreateNeg(C);
   }
+  Value *CreateNSWNeg(Constant *C) const {
+    return BinaryOperator::CreateNSWNeg(C);
+  }
   Value *CreateNot(Constant *C) const {
     return BinaryOperator::CreateNot(C);
   }
diff --git a/include/llvm/Support/TargetFolder.h b/include/llvm/Support/TargetFolder.h
index afed853e86..9aa762570e 100644
--- a/include/llvm/Support/TargetFolder.h
+++ b/include/llvm/Support/TargetFolder.h
@@ -122,6 +122,9 @@ public:
   Constant *CreateNeg(Constant *C) const {
     return Fold(ConstantExpr::getNeg(C));
   }
+  Constant *CreateNSWNeg(Constant *C) const {
+    return Fold(ConstantExpr::getNSWNeg(C));
+  }
   Constant *CreateFNeg(Constant *C) const {
     return Fold(ConstantExpr::getFNeg(C));
   }