[TargetTransformInfo][NFCI] Add TargetTransformInfo::isZExtFree.

Summary:
This function is not used in this change but will be used in a
subsequent change.

Reviewers: mcrosier, chandlerc

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D9180

llvm-svn: 243347

4 files changed, 19 insertions, 0 deletions

diff --git a/llvm/include/llvm/Analysis/TargetTransformInfo.h b/llvm/include/llvm/Analysis/TargetTransformInfo.h
index eb6fa9da369..a85174a1081 100644
--- a/llvm/include/llvm/Analysis/TargetTransformInfo.h
+++ b/llvm/include/llvm/Analysis/TargetTransformInfo.h
@@ -331,6 +331,11 @@ public:
   /// by referencing its sub-register AX.
   bool isTruncateFree(Type *Ty1, Type *Ty2) const;
 
+  /// \brief Return true if it's free to zero extend a value of type Ty1 to type
+  /// Ty2. e.g. on x86-64, all instructions that define 32-bit values implicit
+  /// zero-extend the result out to 64 bits.
+  bool isZExtFree(Type *Ty1, Type *Ty2) const;
+
   /// \brief Return true if it is profitable to hoist instruction in the
   /// then/else to before if.
   bool isProfitableToHoist(Instruction *I) const;
@@ -571,6 +576,7 @@ public:
                                    int64_t BaseOffset, bool HasBaseReg,
                                    int64_t Scale, unsigned AddrSpace) = 0;
   virtual bool isTruncateFree(Type *Ty1, Type *Ty2) = 0;
+  virtual bool isZExtFree(Type *Ty1, Type *Ty2) = 0;
   virtual bool isProfitableToHoist(Instruction *I) = 0;
   virtual bool isTypeLegal(Type *Ty) = 0;
   virtual unsigned getJumpBufAlignment() = 0;
@@ -704,6 +710,9 @@ public:
   bool isTruncateFree(Type *Ty1, Type *Ty2) override {
     return Impl.isTruncateFree(Ty1, Ty2);
   }
+  bool isZExtFree(Type *Ty1, Type *Ty2) override {
+    return Impl.isZExtFree(Ty1, Ty2);
+  }
   bool isProfitableToHoist(Instruction *I) override {
     return Impl.isProfitableToHoist(I);
   }
diff --git a/llvm/include/llvm/Analysis/TargetTransformInfoImpl.h b/llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
index 505126acc0a..2abe0a58b84 100644
--- a/llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
+++ b/llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
@@ -216,6 +216,8 @@ public:
 
   bool isTruncateFree(Type *Ty1, Type *Ty2) { return false; }
 
+  bool isZExtFree(Type *Ty1, Type *Ty2) { return false; }
+
   bool isProfitableToHoist(Instruction *I) { return true; }
 
   bool isTypeLegal(Type *Ty) { return false; }
diff --git a/llvm/include/llvm/CodeGen/BasicTTIImpl.h b/llvm/include/llvm/CodeGen/BasicTTIImpl.h
index 9ba25169fda..796a78c16ac 100644
--- a/llvm/include/llvm/CodeGen/BasicTTIImpl.h
+++ b/llvm/include/llvm/CodeGen/BasicTTIImpl.h
@@ -143,6 +143,10 @@ public:
     return getTLI()->isTruncateFree(Ty1, Ty2);
   }
 
+  bool isZExtFree(Type *Ty1, Type *Ty2) const {
+    return getTLI()->isZExtFree(Ty1, Ty2);
+  }
+
   bool isProfitableToHoist(Instruction *I) {
     return getTLI()->isProfitableToHoist(I);
   }
diff --git a/llvm/lib/Analysis/TargetTransformInfo.cpp b/llvm/lib/Analysis/TargetTransformInfo.cpp
index 7d1c3fbef68..b426b2f121c 100644
--- a/llvm/lib/Analysis/TargetTransformInfo.cpp
+++ b/llvm/lib/Analysis/TargetTransformInfo.cpp
@@ -129,6 +129,10 @@ bool TargetTransformInfo::isTruncateFree(Type *Ty1, Type *Ty2) const {
   return TTIImpl->isTruncateFree(Ty1, Ty2);
 }
 
+bool TargetTransformInfo::isZExtFree(Type *Ty1, Type *Ty2) const {
+  return TTIImpl->isZExtFree(Ty1, Ty2);
+}
+
 bool TargetTransformInfo::isProfitableToHoist(Instruction *I) const {
   return TTIImpl->isProfitableToHoist(I);
 }