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     int VarArgsOffset;  // What is the offset to the first vaarg
  64     int VarArgsBase;    // What is the base FrameIndex
  65     bool useITOF;
  66   public:
  67     explicit AlphaTargetLowering(TargetMachine &TM);
  68
  69     /// getSetCCResultType - Get the SETCC result ValueType
  70     virtual MVT getSetCCResultType(MVT VT) const;
  71
  72     /// LowerOperation - Provide custom lowering hooks for some operations.
  73     ///
  74     virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG);
  75
  76     /// ReplaceNodeResults - Replace the results of node with an illegal result
  77     /// type with new values built out of custom code.
  78     ///
  79     virtual void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue>&Results,
  80                                     SelectionDAG &DAG);
  81
  82     // Friendly names for dumps
  83     const char *getTargetNodeName(unsigned Opcode) const;
  84
  85     SDValue LowerCALL(SDValue Op, SelectionDAG &DAG);
  86     SDNode *LowerCallResult(SDValue Chain, SDValue InFlag, CallSDNode *TheCall,
  87                             unsigned CallingConv, SelectionDAG &DAG);
  88
  89     ConstraintType getConstraintType(const std::string &Constraint) const;
  90
  91     std::vector<unsigned>
  92       getRegClassForInlineAsmConstraint(const std::string &Constraint,
  93                                         MVT VT) const;
  94
  95     bool hasITOF() { return useITOF; }
  96
  97     MachineBasicBlock *EmitInstrWithCustomInserter(MachineInstr *MI,
  98                                                    MachineBasicBlock *BB) const;
  99
 100     virtual bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const;
 101
 102     /// getFunctionAlignment - Return the Log2 alignment of this function.
 103     virtual unsigned getFunctionAlignment(const Function *F) const;
 104
 105   private:
 106     // Helpers for custom lowering.
 107     void LowerVAARG(SDNode *N, SDValue &Chain, SDValue &DataPtr,
 108                     SelectionDAG &DAG);
 109
 110   };
 111 }
 112
 113 #endif   // LLVM_TARGET_ALPHA_ALPHAISELLOWERING_H