lib/Target/MSP430/MSP430ISelLowering.h

   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
  22 namespace 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 = R{R,L}A X, rotate right (left) arithmetically
  31       RRA, RLA,
  32
  33       /// Y = RRC X, rotate right via carry
  34       RRC,
  35
  36       /// CALL - These operations represent an abstract call
  37       /// instruction, which includes a bunch of information.
  38       CALL,
  39
  40       /// Wrapper - A wrapper node for TargetConstantPool, TargetExternalSymbol,
  41       /// and TargetGlobalAddress.
  42       Wrapper,
  43
  44       /// CMP - Compare instruction.
  45       CMP,
  46
  47       /// SetCC. Operand 0 is condition code, and operand 1 is the flag
  48       /// operand produced by a CMP instruction.
  49       SETCC,
  50
  51       /// MSP430 conditional branches. Operand 0 is the chain operand, operand 1
  52       /// is the block to branch if condition is true, operand 2 is the
  53       /// condition code, and operand 3 is the flag operand produced by a CMP
  54       /// instruction.
  55       BR_CC,
  56
  57       /// SELECT_CC. Operand 0 and operand 1 are selection variable, operand 3
  58       /// is condition code and operand 4 is flag operand.
  59       SELECT_CC
  60     };
  61   }
  62
  63   class MSP430Subtarget;
  64   class MSP430TargetMachine;
  65
  66   class MSP430TargetLowering : public TargetLowering {
  67   public:
  68     explicit MSP430TargetLowering(MSP430TargetMachine &TM);
  69
  70     /// LowerOperation - Provide custom lowering hooks for some operations.
  71     virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG);
  72
  73     /// getTargetNodeName - This method returns the name of a target specific
  74     /// DAG node.
  75     virtual const char *getTargetNodeName(unsigned Opcode) const;
  76
  77     /// getFunctionAlignment - Return the Log2 alignment of this function.
  78     virtual unsigned getFunctionAlignment(const Function *F) const;
  79
  80     SDValue LowerShifts(SDValue Op, SelectionDAG &DAG);
  81     SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG);
  82     SDValue LowerExternalSymbol(SDValue Op, SelectionDAG &DAG);
  83     SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG);
  84     SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG);
  85     SDValue LowerSIGN_EXTEND(SDValue Op, SelectionDAG &DAG);
  86
  87     TargetLowering::ConstraintType
  88     getConstraintType(const std::string &Constraint) const;
  89     std::pair<unsigned, const TargetRegisterClass*>
  90     getRegForInlineAsmConstraint(const std::string &Constraint, EVT VT) const;
  91
  92     MachineBasicBlock* EmitInstrWithCustomInserter(MachineInstr *MI,
  93                                                    MachineBasicBlock *BB) const;
  94
  95   private:
  96     SDValue LowerCCCCallTo(SDValue Chain, SDValue Callee,
  97                            CallingConv::ID CallConv, bool isVarArg,
  98                            bool isTailCall,
  99                            const SmallVectorImpl<ISD::OutputArg> &Outs,
 100                            const SmallVectorImpl<ISD::InputArg> &Ins,
 101                            DebugLoc dl, SelectionDAG &DAG,
 102                            SmallVectorImpl<SDValue> &InVals);
 103
 104     SDValue LowerCCCArguments(SDValue Chain,
 105                               CallingConv::ID CallConv,
 106                               bool isVarArg,
 107                               const SmallVectorImpl<ISD::InputArg> &Ins,
 108                               DebugLoc dl,
 109                               SelectionDAG &DAG,
 110                               SmallVectorImpl<SDValue> &InVals);
 111
 112     SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
 113                             CallingConv::ID CallConv, bool isVarArg,
 114                             const SmallVectorImpl<ISD::InputArg> &Ins,
 115                             DebugLoc dl, SelectionDAG &DAG,
 116                             SmallVectorImpl<SDValue> &InVals);
 117
 118     virtual SDValue
 119       LowerFormalArguments(SDValue Chain,
 120                            CallingConv::ID CallConv, bool isVarArg,
 121                            const SmallVectorImpl<ISD::InputArg> &Ins,
 122                            DebugLoc dl, SelectionDAG &DAG,
 123                            SmallVectorImpl<SDValue> &InVals);
 124     virtual SDValue
 125       LowerCall(SDValue Chain, SDValue Callee,
 126                 CallingConv::ID CallConv, bool isVarArg, bool isTailCall,
 127                 const SmallVectorImpl<ISD::OutputArg> &Outs,
 128                 const SmallVectorImpl<ISD::InputArg> &Ins,
 129                 DebugLoc dl, SelectionDAG &DAG,
 130                 SmallVectorImpl<SDValue> &InVals);
 131
 132     virtual SDValue
 133       LowerReturn(SDValue Chain,
 134                   CallingConv::ID CallConv, bool isVarArg,
 135                   const SmallVectorImpl<ISD::OutputArg> &Outs,
 136                   DebugLoc dl, SelectionDAG &DAG);
 137
 138     const MSP430Subtarget &Subtarget;
 139     const MSP430TargetMachine &TM;
 140   };
 141 } // namespace llvm
 142
 143 #endif // LLVM_TARGET_MSP430_ISELLOWERING_H