lib/Target/MBlaze/MBlazeISelLowering.h

   1 //===-- MBlazeISelLowering.h - MBlaze 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 MBlaze uses to lower LLVM code into a
  11 // selection DAG.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #ifndef MBlazeISELLOWERING_H
  16 #define MBlazeISELLOWERING_H
  17
  18 #include "llvm/Support/ErrorHandling.h"
  19 #include "llvm/CodeGen/SelectionDAG.h"
  20 #include "llvm/Target/TargetLowering.h"
  21 #include "MBlaze.h"
  22 #include "MBlazeSubtarget.h"
  23
  24 namespace llvm {
  25   namespace MBlazeCC {
  26     enum CC {
  27       FIRST = 0,
  28       EQ,
  29       NE,
  30       GT,
  31       LT,
  32       GE,
  33       LE
  34     };
  35
  36     inline static CC getOppositeCondition(CC cc) {
  37       switch (cc) {
  38       default: llvm_unreachable("Unknown condition code");
  39       case EQ: return NE;
  40       case NE: return EQ;
  41       case GT: return LE;
  42       case LT: return GE;
  43       case GE: return LT;
  44       case LE: return GE;
  45       }
  46     }
  47
  48     inline static const char *MBlazeCCToString(CC cc) {
  49       switch (cc) {
  50       default: llvm_unreachable("Unknown condition code");
  51       case EQ: return "eq";
  52       case NE: return "ne";
  53       case GT: return "gt";
  54       case LT: return "lt";
  55       case GE: return "ge";
  56       case LE: return "le";
  57       }
  58     }
  59   }
  60
  61   namespace MBlazeISD {
  62     enum NodeType {
  63       // Start the numbering from where ISD NodeType finishes.
  64       FIRST_NUMBER = ISD::BUILTIN_OP_END,
  65
  66       // Jump and link (call)
  67       JmpLink,
  68
  69       // Handle gp_rel (small data/bss sections) relocation.
  70       GPRel,
  71
  72       // Select CC Pseudo Instruction
  73       Select_CC,
  74
  75       // Wrap up multiple types of instructions
  76       Wrap,
  77
  78       // Integer Compare
  79       ICmp,
  80
  81       // Return from subroutine
  82       Ret,
  83
  84       // Return from interrupt
  85       IRet
  86     };
  87   }
  88
  89   //===--------------------------------------------------------------------===//
  90   // TargetLowering Implementation
  91   //===--------------------------------------------------------------------===//
  92
  93   class MBlazeTargetLowering : public TargetLowering  {
  94   public:
  95     explicit MBlazeTargetLowering(MBlazeTargetMachine &TM);
  96
  97     /// LowerOperation - Provide custom lowering hooks for some operations.
  98     virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const;
  99
 100     /// getTargetNodeName - This method returns the name of a target specific
 101     //  DAG node.
 102     virtual const char *getTargetNodeName(unsigned Opcode) const;
 103
 104     /// getSetCCResultType - get the ISD::SETCC result ValueType
 105     MVT::SimpleValueType getSetCCResultType(EVT VT) const;
 106
 107     virtual unsigned getFunctionAlignment(const Function *F) const;
 108   private:
 109     // Subtarget Info
 110     const MBlazeSubtarget *Subtarget;
 111
 112
 113     // Lower Operand helpers
 114     SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
 115                             CallingConv::ID CallConv, bool isVarArg,
 116                             const SmallVectorImpl<ISD::InputArg> &Ins,
 117                             DebugLoc dl, SelectionDAG &DAG,
 118                             SmallVectorImpl<SDValue> &InVals) const;
 119
 120     // Lower Operand specifics
 121     SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) const;
 122     SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
 123     SDValue LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const;
 124     SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) const;
 125     SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const;
 126     SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) const;
 127
 128     virtual SDValue
 129       LowerFormalArguments(SDValue Chain,
 130                            CallingConv::ID CallConv, bool isVarArg,
 131                            const SmallVectorImpl<ISD::InputArg> &Ins,
 132                            DebugLoc dl, SelectionDAG &DAG,
 133                            SmallVectorImpl<SDValue> &InVals) const;
 134
 135     virtual SDValue
 136       LowerCall(SDValue Chain, SDValue Callee,
 137                 CallingConv::ID CallConv, bool isVarArg,
 138                 bool &isTailCall,
 139                 const SmallVectorImpl<ISD::OutputArg> &Outs,
 140                 const SmallVectorImpl<SDValue> &OutVals,
 141                 const SmallVectorImpl<ISD::InputArg> &Ins,
 142                 DebugLoc dl, SelectionDAG &DAG,
 143                 SmallVectorImpl<SDValue> &InVals) const;
 144
 145     virtual SDValue
 146       LowerReturn(SDValue Chain,
 147                   CallingConv::ID CallConv, bool isVarArg,
 148                   const SmallVectorImpl<ISD::OutputArg> &Outs,
 149                   const SmallVectorImpl<SDValue> &OutVals,
 150                   DebugLoc dl, SelectionDAG &DAG) const;
 151
 152     virtual MachineBasicBlock*
 153       EmitCustomShift(MachineInstr *MI, MachineBasicBlock *MBB) const;
 154
 155     virtual MachineBasicBlock*
 156       EmitCustomSelect(MachineInstr *MI, MachineBasicBlock *MBB) const;
 157
 158     virtual MachineBasicBlock*
 159             EmitCustomAtomic(MachineInstr *MI, MachineBasicBlock *MBB) const;
 160
 161     virtual MachineBasicBlock *
 162       EmitInstrWithCustomInserter(MachineInstr *MI,
 163                                   MachineBasicBlock *MBB) const;
 164
 165     // Inline asm support
 166     ConstraintType getConstraintType(const std::string &Constraint) const;
 167
 168     /// Examine constraint string and operand type and determine a weight value.
 169     /// The operand object must already have been set up with the operand type.
 170     ConstraintWeight getSingleConstraintMatchWeight(
 171       AsmOperandInfo &info, const char *constraint) const;
 172
 173     std::pair<unsigned, const TargetRegisterClass*>
 174               getRegForInlineAsmConstraint(const std::string &Constraint,
 175               EVT VT) const;
 176
 177     std::vector<unsigned>
 178     getRegClassForInlineAsmConstraint(const std::string &Constraint,
 179               EVT VT) const;
 180
 181     virtual bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const;
 182
 183     /// isFPImmLegal - Returns true if the target can instruction select the
 184     /// specified FP immediate natively. If false, the legalizer will
 185     /// materialize the FP immediate as a load from a constant pool.
 186     virtual bool isFPImmLegal(const APFloat &Imm, EVT VT) const;
 187   };
 188 }
 189
 190 #endif // MBlazeISELLOWERING_H