MSP430ISelDAGToDAG.cpp revision 10a5a3c82145edc6fe8e9b030b0ccb27b625adb1 
1//===-- MSP430ISelDAGToDAG.cpp - A dag to dag inst selector for MSP430 ----===//
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 MSP430 target.
11//
12//===----------------------------------------------------------------------===//
13
14#include "MSP430.h"
15#include "MSP430ISelLowering.h"
16#include "MSP430TargetMachine.h"
17#include "llvm/DerivedTypes.h"
18#include "llvm/Function.h"
19#include "llvm/Intrinsics.h"
20#include "llvm/CallingConv.h"
21#include "llvm/Constants.h"
22#include "llvm/CodeGen/MachineFrameInfo.h"
23#include "llvm/CodeGen/MachineFunction.h"
24#include "llvm/CodeGen/MachineInstrBuilder.h"
25#include "llvm/CodeGen/MachineRegisterInfo.h"
26#include "llvm/CodeGen/SelectionDAG.h"
27#include "llvm/CodeGen/SelectionDAGISel.h"
28#include "llvm/Target/TargetLowering.h"
29#include "llvm/Support/Compiler.h"
30#include "llvm/Support/Debug.h"
31#include <queue>
32#include <set>
33using namespace llvm;
34
35/// MSP430DAGToDAGISel - MSP430 specific code to select MSP430 machine
36/// instructions for SelectionDAG operations.
37///
38namespace {
39  class MSP430DAGToDAGISel : public SelectionDAGISel {
40    MSP430TargetLowering &Lowering;
41    const MSP430Subtarget &Subtarget;
42
43  public:
44    MSP430DAGToDAGISel(MSP430TargetMachine &TM)
45      : SelectionDAGISel(TM),
46        Lowering(*TM.getTargetLowering()),
47        Subtarget(*TM.getSubtargetImpl()) { }
48
49    virtual void InstructionSelect();
50
51    virtual const char *getPassName() const {
52      return "MSP430 DAG->DAG Pattern Instruction Selection";
53    }
54
55    // Include the pieces autogenerated from the target description.
56  #include "MSP430GenDAGISel.inc"
57
58  private:
59    SDNode *Select(SDValue Op);
60  };
61}  // end anonymous namespace
62
63/// createMSP430ISelDag - This pass converts a legalized DAG into a
64/// MSP430-specific DAG, ready for instruction scheduling.
65///
66FunctionPass *llvm::createMSP430ISelDag(MSP430TargetMachine &TM) {
67  return new MSP430DAGToDAGISel(TM);
68}
69
70/// InstructionSelect - This callback is invoked by
71/// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
72void MSP430DAGToDAGISel::InstructionSelect() {
73  DEBUG(BB->dump());
74
75  // Select target instructions for the DAG.
76  SelectRoot(*CurDAG);
77
78  CurDAG->RemoveDeadNodes();
79}
80
81SDNode *MSP430DAGToDAGISel::Select(SDValue Op) {
82  return SelectCode(Op);
83}
84