lib/Target/Mips/MipsISelDAGToDAG.h

   1 //===---- MipsISelDAGToDAG.h - A Dag to Dag Inst Selector for Mips --------===//
   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 an instruction selector for the MIPS target.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef LLVM_LIB_TARGET_MIPS_MIPSISELDAGTODAG_H
  15 #define LLVM_LIB_TARGET_MIPS_MIPSISELDAGTODAG_H
  16
  17 #include "Mips.h"
  18 #include "MipsSubtarget.h"
  19 #include "MipsTargetMachine.h"
  20 #include "llvm/CodeGen/SelectionDAGISel.h"
  21
  22 //===----------------------------------------------------------------------===//
  23 // Instruction Selector Implementation
  24 //===----------------------------------------------------------------------===//
  25
  26 //===----------------------------------------------------------------------===//
  27 // MipsDAGToDAGISel - MIPS specific code to select MIPS machine
  28 // instructions for SelectionDAG operations.
  29 //===----------------------------------------------------------------------===//
  30 namespace llvm {
  31
  32 class MipsDAGToDAGISel : public SelectionDAGISel {
  33 public:
  34   explicit MipsDAGToDAGISel(MipsTargetMachine &TM, CodeGenOpt::Level OL)
  35       : SelectionDAGISel(TM, OL), Subtarget(nullptr) {}
  36
  37   // Pass Name
  38   StringRef getPassName() const override {
  39     return "MIPS DAG->DAG Pattern Instruction Selection";
  40   }
  41
  42   bool runOnMachineFunction(MachineFunction &MF) override;
  43
  44   void getAnalysisUsage(AnalysisUsage &AU) const override;
  45
  46 protected:
  47   SDNode *getGlobalBaseReg();
  48
  49   /// Keep a pointer to the MipsSubtarget around so that we can make the right
  50   /// decision when generating code for different targets.
  51   const MipsSubtarget *Subtarget;
  52
  53 private:
  54   // Include the pieces autogenerated from the target description.
  55   #include "MipsGenDAGISel.inc"
  56
  57   // Complex Pattern.
  58   /// (reg + imm).
  59   virtual bool selectAddrRegImm(SDValue Addr, SDValue &Base,
  60                                 SDValue &Offset) const;
  61
  62   /// Fall back on this function if all else fails.
  63   virtual bool selectAddrDefault(SDValue Addr, SDValue &Base,
  64                                  SDValue &Offset) const;
  65
  66   /// Match integer address pattern.
  67   virtual bool selectIntAddr(SDValue Addr, SDValue &Base,
  68                              SDValue &Offset) const;
  69
  70   virtual bool selectIntAddr11MM(SDValue Addr, SDValue &Base,
  71                                  SDValue &Offset) const;
  72
  73   virtual bool selectIntAddr12MM(SDValue Addr, SDValue &Base,
  74                                SDValue &Offset) const;
  75
  76   virtual bool selectIntAddr16MM(SDValue Addr, SDValue &Base,
  77                                  SDValue &Offset) const;
  78
  79   virtual bool selectIntAddrLSL2MM(SDValue Addr, SDValue &Base,
  80                                    SDValue &Offset) const;
  81
  82   /// Match addr+simm10 and addr
  83   virtual bool selectIntAddrSImm10(SDValue Addr, SDValue &Base,
  84                                    SDValue &Offset) const;
  85
  86   virtual bool selectIntAddrSImm10Lsl1(SDValue Addr, SDValue &Base,
  87                                        SDValue &Offset) const;
  88
  89   virtual bool selectIntAddrSImm10Lsl2(SDValue Addr, SDValue &Base,
  90                                        SDValue &Offset) const;
  91
  92   virtual bool selectIntAddrSImm10Lsl3(SDValue Addr, SDValue &Base,
  93                                        SDValue &Offset) const;
  94
  95   virtual bool selectAddr16(SDValue Addr, SDValue &Base, SDValue &Offset);
  96   virtual bool selectAddr16SP(SDValue Addr, SDValue &Base, SDValue &Offset);
  97
  98   /// Select constant vector splats.
  99   virtual bool selectVSplat(SDNode *N, APInt &Imm,
 100                             unsigned MinSizeInBits) const;
 101   /// Select constant vector splats whose value fits in a uimm1.
 102   virtual bool selectVSplatUimm1(SDValue N, SDValue &Imm) const;
 103   /// Select constant vector splats whose value fits in a uimm2.
 104   virtual bool selectVSplatUimm2(SDValue N, SDValue &Imm) const;
 105   /// Select constant vector splats whose value fits in a uimm3.
 106   virtual bool selectVSplatUimm3(SDValue N, SDValue &Imm) const;
 107   /// Select constant vector splats whose value fits in a uimm4.
 108   virtual bool selectVSplatUimm4(SDValue N, SDValue &Imm) const;
 109   /// Select constant vector splats whose value fits in a uimm5.
 110   virtual bool selectVSplatUimm5(SDValue N, SDValue &Imm) const;
 111   /// Select constant vector splats whose value fits in a uimm6.
 112   virtual bool selectVSplatUimm6(SDValue N, SDValue &Imm) const;
 113   /// Select constant vector splats whose value fits in a uimm8.
 114   virtual bool selectVSplatUimm8(SDValue N, SDValue &Imm) const;
 115   /// Select constant vector splats whose value fits in a simm5.
 116   virtual bool selectVSplatSimm5(SDValue N, SDValue &Imm) const;
 117   /// Select constant vector splats whose value is a power of 2.
 118   virtual bool selectVSplatUimmPow2(SDValue N, SDValue &Imm) const;
 119   /// Select constant vector splats whose value is the inverse of a
 120   /// power of 2.
 121   virtual bool selectVSplatUimmInvPow2(SDValue N, SDValue &Imm) const;
 122   /// Select constant vector splats whose value is a run of set bits
 123   /// ending at the most significant bit
 124   virtual bool selectVSplatMaskL(SDValue N, SDValue &Imm) const;
 125   /// Select constant vector splats whose value is a run of set bits
 126   /// starting at bit zero.
 127   virtual bool selectVSplatMaskR(SDValue N, SDValue &Imm) const;
 128
 129   void Select(SDNode *N) override;
 130
 131   virtual bool trySelect(SDNode *Node) = 0;
 132
 133   // getImm - Return a target constant with the specified value.
 134   inline SDValue getImm(const SDNode *Node, uint64_t Imm) {
 135     return CurDAG->getTargetConstant(Imm, SDLoc(Node), Node->getValueType(0));
 136   }
 137
 138   virtual void processFunctionAfterISel(MachineFunction &MF) = 0;
 139
 140   bool SelectInlineAsmMemoryOperand(const SDValue &Op,
 141                                     unsigned ConstraintID,
 142                                     std::vector<SDValue> &OutOps) override;
 143 };
 144 }
 145
 146 #endif