| //===-- RISCVISelDAGToDAG.cpp - A dag to dag inst selector for RISCV ------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file defines an instruction selector for the RISCV target. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "RISCV.h" |
| #include "MCTargetDesc/RISCVMCTargetDesc.h" |
| #include "RISCVTargetMachine.h" |
| #include "llvm/CodeGen/SelectionDAGISel.h" |
| #include "llvm/Support/Debug.h" |
| #include "llvm/Support/MathExtras.h" |
| #include "llvm/Support/raw_ostream.h" |
| using namespace llvm; |
| |
| #define DEBUG_TYPE "riscv-isel" |
| |
| // RISCV-specific code to select RISCV machine instructions for |
| // SelectionDAG operations. |
| namespace { |
| class RISCVDAGToDAGISel final : public SelectionDAGISel { |
| public: |
| explicit RISCVDAGToDAGISel(RISCVTargetMachine &TargetMachine) |
| : SelectionDAGISel(TargetMachine) {} |
| |
| StringRef getPassName() const override { |
| return "RISCV DAG->DAG Pattern Instruction Selection"; |
| } |
| |
| void Select(SDNode *Node) override; |
| |
| // Include the pieces autogenerated from the target description. |
| #include "RISCVGenDAGISel.inc" |
| }; |
| } |
| |
| void RISCVDAGToDAGISel::Select(SDNode *Node) { |
| // Dump information about the Node being selected. |
| DEBUG(dbgs() << "Selecting: "; Node->dump(CurDAG); dbgs() << "\n"); |
| |
| // If we have a custom node, we have already selected |
| if (Node->isMachineOpcode()) { |
| DEBUG(dbgs() << "== "; Node->dump(CurDAG); dbgs() << "\n"); |
| Node->setNodeId(-1); |
| return; |
| } |
| |
| // Select the default instruction. |
| SelectCode(Node); |
| } |
| |
| // This pass converts a legalized DAG into a RISCV-specific DAG, ready |
| // for instruction scheduling. |
| FunctionPass *llvm::createRISCVISelDag(RISCVTargetMachine &TM) { |
| return new RISCVDAGToDAGISel(TM); |
| } |