TTI: Add getCallInstrCost.

Review: http://reviews.llvm.org/D8094

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232524 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Analysis/TargetTransformInfo.h

@@ -452,6 +452,10 @@ class TargetTransformInfo {
   unsigned getIntrinsicInstrCost(Intrinsic::ID ID, Type *RetTy,
                                  ArrayRef<Type *> Tys) const;
 
+  /// \returns The cost of Call instructions.
+  unsigned getCallInstrCost(Function *F, Type *RetTy,
+                            ArrayRef<Type *> Tys) const;
+
   /// \returns The number of pieces into which the provided type must be
   /// split during legalization. Zero is returned when the answer is unknown.
   unsigned getNumberOfParts(Type *Tp) const;
@@ -569,6 +573,8 @@ class TargetTransformInfo::Concept {
                                     bool IsPairwiseForm) = 0;
   virtual unsigned getIntrinsicInstrCost(Intrinsic::ID ID, Type *RetTy,
                                          ArrayRef<Type *> Tys) = 0;
+  virtual unsigned getCallInstrCost(Function *F, Type *RetTy,
+                                    ArrayRef<Type *> Tys) = 0;
   virtual unsigned getNumberOfParts(Type *Tp) = 0;
   virtual unsigned getAddressComputationCost(Type *Ty, bool IsComplex) = 0;
   virtual unsigned getCostOfKeepingLiveOverCall(ArrayRef<Type *> Tys) = 0;
@@ -726,6 +732,10 @@ class TargetTransformInfo::Model final : public TargetTransformInfo::Concept {
                                  ArrayRef<Type *> Tys) override {
     return Impl.getIntrinsicInstrCost(ID, RetTy, Tys);
   }
+  unsigned getCallInstrCost(Function *F, Type *RetTy,
+                            ArrayRef<Type *> Tys) override {
+    return Impl.getCallInstrCost(F, RetTy, Tys);
+  }
   unsigned getNumberOfParts(Type *Tp) override {
     return Impl.getNumberOfParts(Tp);
   }

include/llvm/Analysis/TargetTransformInfoImpl.h

@@ -303,6 +303,10 @@ class TargetTransformInfoImplBase {
     return 1;
   }
 
+  unsigned getCallInstrCost(Function *F, Type *RetTy, ArrayRef<Type *> Tys) {
+    return 1;
+  }
+
   unsigned getNumberOfParts(Type *Tp) { return 0; }
 
   unsigned getAddressComputationCost(Type *Tp, bool) { return 0; }

include/llvm/CodeGen/BasicTTIImpl.h

@@ -21,6 +21,7 @@
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Target/TargetLowering.h"
 #include "llvm/Target/TargetSubtargetInfo.h"
+#include "llvm/Analysis/TargetLibraryInfo.h"
 
 namespace llvm {
 
@@ -658,6 +659,20 @@ class BasicTTIImplBase : public TargetTransformInfoImplCRTPBase<T> {
     return 10;
   }
 
+  /// \brief Compute a cost of the given call instruction.
+  ///
+  /// Compute the cost of calling function F with return type RetTy and
+  /// argument types Tys. F might be nullptr, in this case the cost of an
+  /// arbitrary call with the specified signature will be returned.
+  /// This is used, for instance,  when we estimate call of a vector
+  /// counterpart of the given function.
+  /// \param F Called function, might be nullptr.
+  /// \param RetTy,Tys Return value and argument types.
+  /// \returns The cost of Call instruction.
+  unsigned getCallInstrCost(Function *F, Type *RetTy, ArrayRef<Type *> Tys) {
+    return 10;
+  }
+
   unsigned getNumberOfParts(Type *Tp) {
     std::pair<unsigned, MVT> LT = getTLI()->getTypeLegalizationCost(Tp);
     return LT.first;

lib/Analysis/TargetTransformInfo.cpp

@@ -237,6 +237,11 @@ TargetTransformInfo::getIntrinsicInstrCost(Intrinsic::ID ID, Type *RetTy,
   return TTIImpl->getIntrinsicInstrCost(ID, RetTy, Tys);
 }
 
+unsigned TargetTransformInfo::getCallInstrCost(Function *F, Type *RetTy,
+                                               ArrayRef<Type *> Tys) const {
+  return TTIImpl->getCallInstrCost(F, RetTy, Tys);
+}
+
 unsigned TargetTransformInfo::getNumberOfParts(Type *Tp) const {
   return TTIImpl->getNumberOfParts(Tp);
 }