CostModel: We have API for checking the costs of known shuffles. This patch adds

support for the insert-subvector and extract-subvector kinds.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171027 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Target/TargetTransformImpl.h

@@ -71,7 +71,8 @@ public:
 
   virtual unsigned getArithmeticInstrCost(unsigned Opcode, Type *Ty) const;
 
-  virtual unsigned getShuffleCost(ShuffleKind Kind, Type *Tp) const;
+  virtual unsigned getShuffleCost(ShuffleKind Kind, Type *Tp,
+                                  int Index) const;
 
   virtual unsigned getCastInstrCost(unsigned Opcode, Type *Dst,
                                     Type *Src) const;

include/llvm/TargetTransformInfo.h

@@ -158,8 +158,10 @@ public:
   virtual ~VectorTargetTransformInfo() {}
 
   enum ShuffleKind {
-    Broadcast, // Broadcast element 0 to all other elements.
-    Reverse    // Reverse the order of the vector.
+    Broadcast,       // Broadcast element 0 to all other elements.
+    Reverse,         // Reverse the order of the vector.
+    InsertSubvector, // InsertSubvector. Index indicates start offset.
+    ExtractSubvector // ExtractSubvector Index indicates start offset.
   };
 
   /// Returns the expected cost of arithmetic ops, such as mul, xor, fsub, etc.
@@ -168,7 +170,10 @@ public:
   }
 
   /// Returns the cost of a shuffle instruction of kind Kind and of type Tp.
-  virtual unsigned getShuffleCost(ShuffleKind Kind, Type *Tp) const {
+  /// The index parameter is used by some of the shuffle kinds to add
+  /// additional information.
+  virtual unsigned getShuffleCost(ShuffleKind Kind, Type *Tp,
+                                  int Index) const {
     return 1;
   }
 

lib/Target/TargetTransformImpl.cpp

@@ -209,7 +209,8 @@ unsigned VectorTargetTransformImpl::getArithmeticInstrCost(unsigned Opcode,
 }
 
 unsigned VectorTargetTransformImpl::getShuffleCost(ShuffleKind Kind,
-                                                   Type *Tp) const {
+                                                   Type *Tp,
+                                                   int Index) const {
   return 1;
 }