Add a new function to ConstantExpr - getAsInstruction. This returns its Instruction* corollary, which may be useful if a user

wishes to transform a ConstantExpr so that one of its operands is no longer constant.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168262 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 10 insertions, 0 deletions

diff --git a/include/llvm/Constants.h b/include/llvm/Constants.h
index b7d1a488f5..3308499192 100644
--- a/include/llvm/Constants.h
+++ b/include/llvm/Constants.h
@@ -1076,6 +1076,16 @@ public:
   /// current one.
   Constant *getWithOperands(ArrayRef<Constant*> Ops, Type *Ty) const;
 
+  /// getAsInstruction - Returns an Instruction which implements the same operation
+  /// as this ConstantExpr. The instruction is not linked to any basic block.
+  ///
+  /// A better approach to this could be to have a constructor for Instruction
+  /// which would take a ConstantExpr parameter, but that would have spread 
+  /// implementation details of ConstantExpr outside of Constants.cpp, which 
+  /// would make it harded to remove ConstantExprs altogether
+  /// (http://llvm.org/bugs/show_bug.cgi?id=10368).
+  Instruction *getAsInstruction();
+
   virtual void destroyConstant();
   virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U);