MSP430ISelLowering.h revision 8b528e52ee6018b0d0e7e46b3b4cf6f41fdaa0d9 
1//==-- MSP430ISelLowering.h - MSP430 DAG Lowering Interface ------*- C++ -*-==//
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 the interfaces that MSP430 uses to lower LLVM code into a
11// selection DAG.
12//
13//===----------------------------------------------------------------------===//
14
15#ifndef LLVM_TARGET_MSP430_ISELLOWERING_H
16#define LLVM_TARGET_MSP430_ISELLOWERING_H
17
18#include "MSP430.h"
19#include "llvm/CodeGen/SelectionDAG.h"
20#include "llvm/Target/TargetLowering.h"
21
22namespace llvm {
23  namespace MSP430ISD {
24    enum {
25      FIRST_NUMBER = ISD::BUILTIN_OP_END,
26
27      /// Return with a flag operand. Operand 0 is the chain operand.
28      RET_FLAG,
29
30      /// Y = RRA X, rotate right arithmetically
31      RRA,
32
33      /// CALL/TAILCALL - These operations represent an abstract call
34      /// instruction, which includes a bunch of information.
35      CALL,
36
37      /// Wrapper - A wrapper node for TargetConstantPool, TargetExternalSymbol,
38      /// and TargetGlobalAddress.
39      Wrapper,
40
41      /// CMP - Compare instruction.
42      CMP,
43
44      /// SetCC. Operand 0 is condition code, and operand 1 is the flag
45      /// operand produced by a CMP instruction.
46      SETCC,
47
48      /// MSP430 conditional branches. Operand 0 is the chain operand, operand 1
49      /// is the block to branch if condition is true, operand 2 is the
50      /// condition code, and operand 3 is the flag operand produced by a CMP
51      /// instruction.
52      BRCOND,
53
54      /// SELECT. Operand 0 and operand 1 are selection variable, operand 3 is
55      /// condition code and operand 4 is flag operand.
56      SELECT
57    };
58  }
59
60  class MSP430Subtarget;
61  class MSP430TargetMachine;
62
63  class MSP430TargetLowering : public TargetLowering {
64  public:
65    explicit MSP430TargetLowering(MSP430TargetMachine &TM);
66
67    /// LowerOperation - Provide custom lowering hooks for some operations.
68    virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG);
69
70    /// getTargetNodeName - This method returns the name of a target specific
71    /// DAG node.
72    virtual const char *getTargetNodeName(unsigned Opcode) const;
73
74    virtual MVT getSetCCResultType(MVT VT) const;
75
76    SDValue LowerFORMAL_ARGUMENTS(SDValue Op, SelectionDAG &DAG);
77    SDValue LowerCALL(SDValue Op, SelectionDAG &DAG);
78    SDValue LowerRET(SDValue Op, SelectionDAG &DAG);
79    SDValue LowerCCCArguments(SDValue Op, SelectionDAG &DAG);
80    SDValue LowerShifts(SDValue Op, SelectionDAG &DAG);
81    SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG);
82    SDValue LowerSETCC(SDValue Op, SelectionDAG &DAG);
83    SDValue LowerBRCOND(SDValue Op, SelectionDAG &DAG);
84    SDValue LowerSELECT(SDValue Op, SelectionDAG &DAG);
85
86    SDValue LowerCCCCallTo(SDValue Op, SelectionDAG &DAG,
87                           unsigned CC);
88    SDNode* LowerCallResult(SDValue Chain, SDValue InFlag,
89                            CallSDNode *TheCall,
90                            unsigned CallingConv, SelectionDAG &DAG);
91
92    MachineBasicBlock* EmitInstrWithCustomInserter(MachineInstr *MI,
93                                                   MachineBasicBlock *BB) const;
94
95  private:
96    const MSP430Subtarget &Subtarget;
97    const MSP430TargetMachine &TM;
98  };
99} // namespace llvm
100
101#endif // LLVM_TARGET_MSP430_ISELLOWERING_H
102