[TTI] Move getIntrinsicCost to allow functions to be overridden. NFC.

[SjoerdMeijer]

Summary

Moving this to base class TargetTransformInfoImplCRTPBase allows static_cast to a subtarget so that calls to e.g. getMemcpyCost go the overridden functions.

[dmgreen]

From my understanding of TTI, LGTM.

include/llvm/Analysis/TargetTransformInfoImpl.h

public:
   }
 
   unsigned getInliningThresholdMultiplier() { return 1; }
 
   unsigned getMemcpyCost(const Instruction *I) {
     return TTI::TCC_Expensive;
   }
 
-  unsigned getIntrinsicCost(Intrinsic::ID IID, Type *RetTy,
-                            ArrayRef<Type *> ParamTys, const User *U) {
-    switch (IID) {
-    default:
-      // Intrinsics rarely (if ever) have normal argument setup constraints.
-      // Model them as having a basic instruction cost.
-      return TTI::TCC_Basic;
-
-    // TODO: other libc intrinsics.
-    case Intrinsic::memcpy:
-      return getMemcpyCost(dyn_cast<Instruction>(U));
-
-    case Intrinsic::annotation:
-    case Intrinsic::assume:
-    case Intrinsic::sideeffect:
-    case Intrinsic::dbg_declare:
-    case Intrinsic::dbg_value:
-    case Intrinsic::dbg_label:
-    case Intrinsic::invariant_start:
-    case Intrinsic::invariant_end:
-    case Intrinsic::launder_invariant_group:
-    case Intrinsic::strip_invariant_group:
-    case Intrinsic::is_constant:
-    case Intrinsic::lifetime_start:
-    case Intrinsic::lifetime_end:
-    case Intrinsic::objectsize:
-    case Intrinsic::ptr_annotation:
-    case Intrinsic::var_annotation:
-    case Intrinsic::experimental_gc_result:
-    case Intrinsic::experimental_gc_relocate:
-    case Intrinsic::coro_alloc:
-    case Intrinsic::coro_begin:
-    case Intrinsic::coro_free:
-    case Intrinsic::coro_end:
-    case Intrinsic::coro_frame:
-    case Intrinsic::coro_size:
-    case Intrinsic::coro_suspend:
-    case Intrinsic::coro_param:
-    case Intrinsic::coro_subfn_addr:
-      // These intrinsics don't actually represent code after lowering.
-      return TTI::TCC_Free;
-    }
-  }
-
   bool hasBranchDivergence() { return false; }
 
   bool isSourceOfDivergence(const Value *V) { return false; }
 
   bool isAlwaysUniform(const Value *V) { return false; }
 
   unsigned getFlatAddressSpace () {
     return -1;
int getGEPCost(Type *PointeeType, const Value *Ptr,
 
     if (static_cast<T *>(this)->isLegalAddressingMode(
             TargetType, const_cast<GlobalValue *>(BaseGV),
             BaseOffset.sextOrTrunc(64).getSExtValue(), HasBaseReg, Scale, AS))
       return TTI::TCC_Free;
     return TTI::TCC_Basic;
   }
 
-  using BaseT::getIntrinsicCost;
+  unsigned getIntrinsicCost(Intrinsic::ID IID, Type *RetTy,
+                            ArrayRef<Type *> ParamTys, const User *U) {
+    switch (IID) {
+    default:
+      // Intrinsics rarely (if ever) have normal argument setup constraints.
+      // Model them as having a basic instruction cost.
+      return TTI::TCC_Basic;
+
+    // TODO: other libc intrinsics.
+    case Intrinsic::memcpy:
+      return static_cast<T *>(this)->getMemcpyCost(dyn_cast<Instruction>(U));
+
+    case Intrinsic::annotation:
+    case Intrinsic::assume:
+    case Intrinsic::sideeffect:
+    case Intrinsic::dbg_declare:
+    case Intrinsic::dbg_value:
+    case Intrinsic::dbg_label:
+    case Intrinsic::invariant_start:
+    case Intrinsic::invariant_end:
+    case Intrinsic::launder_invariant_group:
+    case Intrinsic::strip_invariant_group:
+    case Intrinsic::is_constant:
+    case Intrinsic::lifetime_start:
+    case Intrinsic::lifetime_end:
+    case Intrinsic::objectsize:
+    case Intrinsic::ptr_annotation:
+    case Intrinsic::var_annotation:
+    case Intrinsic::experimental_gc_result:
+    case Intrinsic::experimental_gc_relocate:
+    case Intrinsic::coro_alloc:
+    case Intrinsic::coro_begin:
+    case Intrinsic::coro_free:
+    case Intrinsic::coro_end:
+    case Intrinsic::coro_frame:
+    case Intrinsic::coro_size:
+    case Intrinsic::coro_suspend:
+    case Intrinsic::coro_param:
+    case Intrinsic::coro_subfn_addr:
+      // These intrinsics don't actually represent code after lowering.
+      return TTI::TCC_Free;
+    }
+  }
 
   unsigned getIntrinsicCost(Intrinsic::ID IID, Type *RetTy,
                             ArrayRef<const Value *> Arguments, const User *U) {
     // Delegate to the generic intrinsic handling code. This mostly provides an
     // opportunity for targets to (for example) special case the cost of
     // certain intrinsics based on constants used as arguments.
     SmallVector<Type *, 8> ParamTys;
     ParamTys.reserve(Arguments.size());