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   private:
 108     // Subtarget Info
 109     const MBlazeSubtarget *Subtarget;
 110
 111
 112     // Lower Operand helpers
 113     SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
 114                             CallingConv::ID CallConv, bool isVarArg,
 115                             const SmallVectorImpl<ISD::InputArg> &Ins,
 116                             DebugLoc dl, SelectionDAG &DAG,
 117                             SmallVectorImpl<SDValue> &InVals) const;
 118
 119     // Lower Operand specifics
 120     SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) const;
 121     SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
 122     SDValue LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const;
 123     SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) const;
 124     SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const;
 125     SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) const;
 126
 127     virtual SDValue
 128       LowerFormalArguments(SDValue Chain,
 129                            CallingConv::ID CallConv, bool isVarArg,
 130                            const SmallVectorImpl<ISD::InputArg> &Ins,
 131                            DebugLoc dl, SelectionDAG &DAG,
 132                            SmallVectorImpl<SDValue> &InVals) const;
 133
 134     virtual SDValue
 135       LowerCall(SDValue Chain, SDValue Callee,
 136                 CallingConv::ID CallConv, bool isVarArg,
 137                 bool &isTailCall,
 138                 const SmallVectorImpl<ISD::OutputArg> &Outs,
 139                 const SmallVectorImpl<SDValue> &OutVals,
 140                 const SmallVectorImpl<ISD::InputArg> &Ins,
 141                 DebugLoc dl, SelectionDAG &DAG,
 142                 SmallVectorImpl<SDValue> &InVals) const;
 143
 144     virtual SDValue
 145       LowerReturn(SDValue Chain,
 146                   CallingConv::ID CallConv, bool isVarArg,
 147                   const SmallVectorImpl<ISD::OutputArg> &Outs,
 148                   const SmallVectorImpl<SDValue> &OutVals,
 149                   DebugLoc dl, SelectionDAG &DAG) const;
 150
 151     virtual MachineBasicBlock*
 152       EmitCustomShift(MachineInstr *MI, MachineBasicBlock *MBB) const;
 153
 154     virtual MachineBasicBlock*
 155       EmitCustomSelect(MachineInstr *MI, MachineBasicBlock *MBB) const;
 156
 157     virtual MachineBasicBlock*
 158             EmitCustomAtomic(MachineInstr *MI, MachineBasicBlock *MBB) const;
 159
 160     virtual MachineBasicBlock *
 161       EmitInstrWithCustomInserter(MachineInstr *MI,
 162                                   MachineBasicBlock *MBB) const;
 163
 164     // Inline asm support
 165     ConstraintType getConstraintType(const std::string &Constraint) const;
 166
 167     /// Examine constraint string and operand type and determine a weight value.
 168     /// The operand object must already have been set up with the operand type.
 169     ConstraintWeight getSingleConstraintMatchWeight(
 170       AsmOperandInfo &info, const char *constraint) const;
 171
 172     std::pair<unsigned, const TargetRegisterClass*>
 173               getRegForInlineAsmConstraint(const std::string &Constraint,
 174               EVT VT) const;
 175
 176     virtual bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const;
 177
 178     /// isFPImmLegal - Returns true if the target can instruction select the
 179     /// specified FP immediate natively. If false, the legalizer will
 180     /// materialize the FP immediate as a load from a constant pool.
 181     virtual bool isFPImmLegal(const APFloat &Imm, EVT VT) const;
 182   };
 183 }
 184
 185 #endif // MBlazeISELLOWERING_H