1 //===-- Nios2ISelDAGToDAG.cpp - A Dag to Dag Inst Selector for Nios2 ------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file defines an instruction selector for the NIOS2 target. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "Nios2.h" 15 #include "Nios2TargetMachine.h" 16 #include "llvm/CodeGen/SelectionDAGISel.h" 17 #include "llvm/Support/Debug.h" 18 using namespace llvm; 19 20 #define DEBUG_TYPE "nios2-isel" 21 22 //===----------------------------------------------------------------------===// 23 // Instruction Selector Implementation 24 //===----------------------------------------------------------------------===// 25 26 //===----------------------------------------------------------------------===// 27 // Nios2DAGToDAGISel - NIOS2 specific code to select NIOS2 machine 28 // instructions for SelectionDAG operations. 29 //===----------------------------------------------------------------------===// 30 31 namespace { 32 33 class Nios2DAGToDAGISel : public SelectionDAGISel { 34 /// Subtarget - Keep a pointer to the Nios2 Subtarget around so that we can 35 /// make the right decision when generating code for different targets. 36 const Nios2Subtarget *Subtarget; 37 38 public: 39 explicit Nios2DAGToDAGISel(Nios2TargetMachine &TM, CodeGenOpt::Level OL) 40 : SelectionDAGISel(TM, OL) {} 41 42 bool runOnMachineFunction(MachineFunction &MF) override { 43 Subtarget = &MF.getSubtarget<Nios2Subtarget>(); 44 return SelectionDAGISel::runOnMachineFunction(MF); 45 } 46 47 void Select(SDNode *N) override; 48 49 // Pass Name 50 StringRef getPassName() const override { 51 return "NIOS2 DAG->DAG Pattern Instruction Selection"; 52 } 53 54 #include "Nios2GenDAGISel.inc" 55 }; 56 } // namespace 57 58 // Select instructions not customized! Used for 59 // expanded, promoted and normal instructions 60 void Nios2DAGToDAGISel::Select(SDNode *Node) { 61 62 // If we have a custom node, we already have selected! 63 if (Node->isMachineOpcode()) { 64 LLVM_DEBUG(errs() << "== "; Node->dump(CurDAG); errs() << "\n"); 65 Node->setNodeId(-1); 66 return; 67 } 68 69 // Select the default instruction 70 SelectCode(Node); 71 } 72 73 FunctionPass *llvm::createNios2ISelDag(Nios2TargetMachine &TM, 74 CodeGenOpt::Level OptLevel) { 75 return new Nios2DAGToDAGISel(TM, OptLevel); 76 } 77
