lib/Target/Alpha/AlphaISelLowering.h

   1 //===-- AlphaISelLowering.h - Alpha 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 Alpha uses to lower LLVM code into a
  11 // selection DAG.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #ifndef LLVM_TARGET_ALPHA_ALPHAISELLOWERING_H
  16 #define LLVM_TARGET_ALPHA_ALPHAISELLOWERING_H
  17
  18 #include "llvm/ADT/VectorExtras.h"
  19 #include "llvm/Target/TargetLowering.h"
  20 #include "llvm/CodeGen/SelectionDAG.h"
  21 #include "Alpha.h"
  22
  23 namespace llvm {
  24
  25   namespace AlphaISD {
  26     enum NodeType {
  27       // Start the numbering where the builting ops and target ops leave off.
  28       FIRST_NUMBER = ISD::BUILTIN_OP_END,
  29       //These corrospond to the identical Instruction
  30       CVTQT_, CVTQS_, CVTTQ_,
  31
  32       /// GPRelHi/GPRelLo - These represent the high and low 16-bit
  33       /// parts of a global address respectively.
  34       GPRelHi, GPRelLo,
  35
  36       /// RetLit - Literal Relocation of a Global
  37       RelLit,
  38
  39       /// GlobalRetAddr - used to restore the return address
  40       GlobalRetAddr,
  41
  42       /// CALL - Normal call.
  43       CALL,
  44
  45       /// DIVCALL - used for special library calls for div and rem
  46       DivCall,
  47
  48       /// return flag operand
  49       RET_FLAG,
  50
  51       /// CHAIN = COND_BRANCH CHAIN, OPC, (G|F)PRC, DESTBB [, INFLAG] - This
  52       /// corresponds to the COND_BRANCH pseudo instruction.
  53       /// *PRC is the input register to compare to zero,
  54       /// OPC is the branch opcode to use (e.g. Alpha::BEQ),
  55       /// DESTBB is the destination block to branch to, and INFLAG is
  56       /// an optional input flag argument.
  57       COND_BRANCH_I, COND_BRANCH_F
  58
  59     };
  60   }
  61
  62   class AlphaTargetLowering : public TargetLowering {
  63   public:
  64     explicit AlphaTargetLowering(TargetMachine &TM);
  65
  66     /// getSetCCResultType - Get the SETCC result ValueType
  67     virtual MVT::SimpleValueType getSetCCResultType(EVT VT) const;
  68
  69     /// LowerOperation - Provide custom lowering hooks for some operations.
  70     ///
  71     virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const;
  72
  73     /// ReplaceNodeResults - Replace the results of node with an illegal result
  74     /// type with new values built out of custom code.
  75     ///
  76     virtual void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue>&Results,
  77                                     SelectionDAG &DAG) const;
  78
  79     // Friendly names for dumps
  80     const char *getTargetNodeName(unsigned Opcode) const;
  81
  82     SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
  83                             CallingConv::ID CallConv, bool isVarArg,
  84                             const SmallVectorImpl<ISD::InputArg> &Ins,
  85                             DebugLoc dl, SelectionDAG &DAG,
  86                             SmallVectorImpl<SDValue> &InVals) const;
  87
  88     ConstraintType getConstraintType(const std::string &Constraint) const;
  89
  90     /// Examine constraint string and operand type and determine a weight value.
  91     /// The operand object must already have been set up with the operand type.
  92     ConstraintWeight getSingleConstraintMatchWeight(
  93       AsmOperandInfo &info, const char *constraint) const;
  94
  95     std::vector<unsigned>
  96       getRegClassForInlineAsmConstraint(const std::string &Constraint,
  97                                         EVT VT) const;
  98
  99     MachineBasicBlock *
 100       EmitInstrWithCustomInserter(MachineInstr *MI,
 101                                   MachineBasicBlock *BB) const;
 102
 103     virtual bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const;
 104
 105     /// getFunctionAlignment - Return the Log2 alignment of this function.
 106     virtual unsigned getFunctionAlignment(const Function *F) const;
 107
 108     /// isFPImmLegal - Returns true if the target can instruction select the
 109     /// specified FP immediate natively. If false, the legalizer will
 110     /// materialize the FP immediate as a load from a constant pool.
 111     virtual bool isFPImmLegal(const APFloat &Imm, EVT VT) const;
 112
 113   private:
 114     // Helpers for custom lowering.
 115     void LowerVAARG(SDNode *N, SDValue &Chain, SDValue &DataPtr,
 116                     SelectionDAG &DAG) const;
 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) const;
 124
 125     virtual SDValue
 126       LowerCall(SDValue Chain, SDValue Callee,
 127                 CallingConv::ID CallConv, bool isVarArg, bool &isTailCall,
 128                 const SmallVectorImpl<ISD::OutputArg> &Outs,
 129                 const SmallVectorImpl<SDValue> &OutVals,
 130                 const SmallVectorImpl<ISD::InputArg> &Ins,
 131                 DebugLoc dl, SelectionDAG &DAG,
 132                 SmallVectorImpl<SDValue> &InVals) const;
 133
 134     virtual SDValue
 135       LowerReturn(SDValue Chain,
 136                   CallingConv::ID CallConv, bool isVarArg,
 137                   const SmallVectorImpl<ISD::OutputArg> &Outs,
 138                   const SmallVectorImpl<SDValue> &OutVals,
 139                   DebugLoc dl, SelectionDAG &DAG) const;
 140   };
 141 }
 142
 143 #endif   // LLVM_TARGET_ALPHA_ALPHAISELLOWERING_H