forked from OSchip/llvm-project
80 lines
2.5 KiB
C++
80 lines
2.5 KiB
C++
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//===-- Nios2ISelDAGToDAG.cpp - A Dag to Dag Inst Selector for Nios2 ------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines an instruction selector for the NIOS2 target.
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//
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//===----------------------------------------------------------------------===//
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#include "Nios2.h"
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#include "Nios2TargetMachine.h"
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#include "llvm/CodeGen/SelectionDAGISel.h"
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#include "llvm/Support/Debug.h"
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using namespace llvm;
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#define DEBUG_TYPE "nios2-isel"
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//===----------------------------------------------------------------------===//
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// Instruction Selector Implementation
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//===----------------------------------------------------------------------===//
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//===----------------------------------------------------------------------===//
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// Nios2DAGToDAGISel - NIOS2 specific code to select NIOS2 machine
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// instructions for SelectionDAG operations.
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//===----------------------------------------------------------------------===//
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namespace {
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class Nios2DAGToDAGISel : public SelectionDAGISel {
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/// Subtarget - Keep a pointer to the Nios2 Subtarget around so that we can
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/// make the right decision when generating code for different targets.
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const Nios2Subtarget *Subtarget;
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public:
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explicit Nios2DAGToDAGISel(Nios2TargetMachine &TM, CodeGenOpt::Level OL)
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: SelectionDAGISel(TM, OL) {}
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bool runOnMachineFunction(MachineFunction &MF) override {
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Subtarget = &MF.getSubtarget<Nios2Subtarget>();
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return SelectionDAGISel::runOnMachineFunction(MF);
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}
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void Select(SDNode *N) override;
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// Pass Name
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StringRef getPassName() const override {
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return "NIOS2 DAG->DAG Pattern Instruction Selection";
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}
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#include "Nios2GenDAGISel.inc"
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};
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} // namespace
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// Select instructions not customized! Used for
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// expanded, promoted and normal instructions
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void Nios2DAGToDAGISel::Select(SDNode *Node) {
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// Dump information about the Node being selected
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DEBUG(errs() << "Selecting: "; Node->dump(CurDAG); errs() << "\n");
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// If we have a custom node, we already have selected!
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if (Node->isMachineOpcode()) {
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DEBUG(errs() << "== "; Node->dump(CurDAG); errs() << "\n");
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Node->setNodeId(-1);
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return;
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}
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// Select the default instruction
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SelectCode(Node);
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}
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FunctionPass *llvm::createNios2ISelDag(Nios2TargetMachine &TM,
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CodeGenOpt::Level OptLevel) {
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return new Nios2DAGToDAGISel(TM, OptLevel);
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}
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