[NFCI][CostModel][AMDGPU] Simplify getUserCost

[samparker]

Summary

Casts and intrinsics are now handled by the default implementation of getUserCost, so remove them from the backends switch statement.

[dfukalov]

Thanks!

[samparker]

Committed in 6f24ebc4badf.

llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.cpp

   }
   case Instruction::InsertElement: {
     ConstantInt *CI = dyn_cast<ConstantInt>(I->getOperand(2));
     unsigned Idx = -1;
     if (CI)
       Idx = CI->getZExtValue();
     return getVectorInstrCost(I->getOpcode(), I->getType(), Idx);
   }
-  case Instruction::Call: {
-    if (const IntrinsicInst *II = dyn_cast<IntrinsicInst>(U)) {
-      IntrinsicCostAttributes CostAttrs(*II);
-      return getIntrinsicInstrCost(CostAttrs, CostKind);
-    } else {
-      return BaseT::getUserCost(U, Operands, CostKind);
-    }
-  }
   case Instruction::ShuffleVector: {
     const ShuffleVectorInst *Shuffle = cast<ShuffleVectorInst>(I);
     auto *Ty = cast<VectorType>(Shuffle->getType());
     auto *SrcTy = cast<VectorType>(Shuffle->getOperand(0)->getType());
 
     // TODO: Identify and add costs for insert subvector, etc.
     int SubIndex;
     if (Shuffle->isExtractSubvectorMask(SubIndex))

     if (Shuffle->isZeroEltSplat())
       return getShuffleCost(TTI::SK_Broadcast, Ty, 0, nullptr);
 
     if (Shuffle->isSingleSource())
       return getShuffleCost(TTI::SK_PermuteSingleSrc, Ty, 0, nullptr);
 
     return getShuffleCost(TTI::SK_PermuteTwoSrc, Ty, 0, nullptr);
   }
-  case Instruction::ZExt:
-  case Instruction::SExt:
-  case Instruction::FPToUI:
-  case Instruction::FPToSI:
-  case Instruction::FPExt:
-  case Instruction::PtrToInt:
-  case Instruction::IntToPtr:
-  case Instruction::SIToFP:
-  case Instruction::UIToFP:
-  case Instruction::Trunc:
-  case Instruction::FPTrunc:
-  case Instruction::BitCast:
-  case Instruction::AddrSpaceCast: {
-    return getCastInstrCost(I->getOpcode(), I->getType(),
-                            I->getOperand(0)->getType(), CostKind, I);
-  }
   case Instruction::Add:
   case Instruction::FAdd:
   case Instruction::Sub:
   case Instruction::FSub:
   case Instruction::Mul:
   case Instruction::FMul:
   case Instruction::UDiv:
   case Instruction::SDiv: