update comment

Author: inbelic

llvm/include/llvm/Analysis/TargetTransformInfo.h

@@ -896,6 +896,8 @@ class TargetTransformInfo {
   bool isTargetIntrinsicWithScalarOpAtArg(Intrinsic::ID ID,
                                           unsigned ScalarOpdIdx) const;
 
+  /// Identifies if the vector form of the intrinsic is overloaded on the type of
+  /// the operand at index \p OpdIdx, or on the return type if \p OpdIdx is -1.
   bool isVectorIntrinsicWithOverloadTypeAtArg(Intrinsic::ID ID,
                                               int ScalarOpdIdx) const;
 

llvm/include/llvm/Analysis/VectorUtils.h

@@ -152,6 +152,8 @@ bool isVectorIntrinsicWithScalarOpAtArg(Intrinsic::ID ID,
 
 /// Identifies if the vector form of the intrinsic is overloaded on the type of
 /// the operand at index \p OpdIdx, or on the return type if \p OpdIdx is -1.
+/// \p TTI is used to consider target specific intrinsics, if no target specific
+/// intrinsics will be considered then it is appropriate to pass in nullptr.
 bool isVectorIntrinsicWithOverloadTypeAtArg(Intrinsic::ID ID, int OpdIdx,
                                             const TargetTransformInfo *TTI);