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//===-- 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);
}
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