Index: include/llvm/Analysis/TargetTransformInfo.h
===================================================================
--- include/llvm/Analysis/TargetTransformInfo.h
+++ include/llvm/Analysis/TargetTransformInfo.h
@@ -598,6 +598,20 @@
 
   /// @}
 
+  /// Returns true iff i32 parameters to library functions should have
+  /// signext or zeroext attributes if they correspond to C-level int or
+  /// unsigned int, respectively.
+  bool shouldExtI32Param() const;
+
+  /// Returns true iff i32 results from library functions should have
+  /// signext or zeroext attributes if they correspond to C-level int or
+  /// unsigned int, respectively.
+  bool shouldExtI32Result() const;
+
+  /// Returns true iff i32 parameters to library functions should have
+  /// signext attribute if they correspond to C-level int or unsigned int.
+  bool shouldSignExtI32Param() const;
+
 private:
   /// \brief The abstract base class used to type erase specific TTI
   /// implementations.
@@ -716,6 +730,9 @@
                                                    Type *ExpectedType) = 0;
   virtual bool areInlineCompatible(const Function *Caller,
                                    const Function *Callee) const = 0;
+  virtual bool shouldExtI32Param() const = 0;
+  virtual bool shouldExtI32Result() const = 0;
+  virtual bool shouldSignExtI32Param() const = 0;
 };
 
 template <typename T>
@@ -948,6 +965,15 @@
                            const Function *Callee) const override {
     return Impl.areInlineCompatible(Caller, Callee);
   }
+  bool shouldExtI32Param() const override {
+    return Impl.shouldExtI32Param();
+  }
+  bool shouldExtI32Result() const override {
+    return Impl.shouldExtI32Result();
+  }
+  bool shouldSignExtI32Param() const override {
+    return Impl.shouldSignExtI32Param();
+  }
 };
 
 template <typename T>
Index: include/llvm/Analysis/TargetTransformInfoImpl.h
===================================================================
--- include/llvm/Analysis/TargetTransformInfoImpl.h
+++ include/llvm/Analysis/TargetTransformInfoImpl.h
@@ -371,6 +371,12 @@
            (Caller->getFnAttribute("target-features") ==
             Callee->getFnAttribute("target-features"));
   }
+
+  bool shouldExtI32Param() const { return false; }
+
+  bool shouldExtI32Result() const { return false; }
+
+  bool shouldSignExtI32Param() const { return false; }
 };
 
 /// \brief CRTP base class for use as a mix-in that aids implementing
Index: lib/Analysis/TargetTransformInfo.cpp
===================================================================
--- lib/Analysis/TargetTransformInfo.cpp
+++ lib/Analysis/TargetTransformInfo.cpp
@@ -396,6 +396,18 @@
   return TTIImpl->areInlineCompatible(Caller, Callee);
 }
 
+bool TargetTransformInfo::shouldExtI32Param() const {
+  return TTIImpl->shouldExtI32Param();
+}
+
+bool TargetTransformInfo::shouldExtI32Result() const {
+  return TTIImpl->shouldExtI32Result();
+}
+
+bool TargetTransformInfo::shouldSignExtI32Param() const {
+  return TTIImpl->shouldSignExtI32Param();
+}
+
 TargetTransformInfo::Concept::~Concept() {}
 
 TargetIRAnalysis::TargetIRAnalysis() : TTICallback(&getDefaultTTI) {}