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//===-- CSKYISelDAGToDAG.cpp - A dag to dag inst selector for CSKY---------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines an instruction selector for the CSKY target.
//
//===----------------------------------------------------------------------===//
#include "CSKY.h"
#include "CSKYSubtarget.h"
#include "CSKYTargetMachine.h"
#include "MCTargetDesc/CSKYMCTargetDesc.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/CodeGen/SelectionDAGISel.h"
using namespace llvm;
#define DEBUG_TYPE "csky-isel"
namespace {
class CSKYDAGToDAGISel : public SelectionDAGISel {
const CSKYSubtarget *Subtarget;
public:
explicit CSKYDAGToDAGISel(CSKYTargetMachine &TM) : SelectionDAGISel(TM) {}
StringRef getPassName() const override {
return "CSKY DAG->DAG Pattern Instruction Selection";
}
bool runOnMachineFunction(MachineFunction &MF) override {
// Reset the subtarget each time through.
Subtarget = &MF.getSubtarget<CSKYSubtarget>();
SelectionDAGISel::runOnMachineFunction(MF);
return true;
}
void Select(SDNode *N) override;
#include "CSKYGenDAGISel.inc"
};
} // namespace
void CSKYDAGToDAGISel::Select(SDNode *N) {
// If we have a custom node, we have already selected
if (N->isMachineOpcode()) {
LLVM_DEBUG(dbgs() << "== "; N->dump(CurDAG); dbgs() << "\n");
N->setNodeId(-1);
return;
}
SDLoc Dl(N);
unsigned Opcode = N->getOpcode();
bool IsSelected = false;
switch (Opcode) {
default:
break;
// FIXME: Add selection nodes needed later.
}
if (IsSelected)
return;
// Select the default instruction.
SelectCode(N);
}
FunctionPass *llvm::createCSKYISelDag(CSKYTargetMachine &TM) {
return new CSKYDAGToDAGISel(TM);
}
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