1 //===---- Mips16ISelDAGToDAG.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 // Subclass of MipsDAGToDAGISel specialized for mips16.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_LIB_TARGET_MIPS_MIPS16ISELDAGTODAG_H
15 #define LLVM_LIB_TARGET_MIPS_MIPS16ISELDAGTODAG_H
16 
17 #include "MipsISelDAGToDAG.h"
18 
19 namespace llvm {
20 
21 class Mips16DAGToDAGISel : public MipsDAGToDAGISel {
22 public:
Mips16DAGToDAGISel(MipsTargetMachine & TM)23   explicit Mips16DAGToDAGISel(MipsTargetMachine &TM) : MipsDAGToDAGISel(TM) {}
24 
25 private:
26   std::pair<SDNode*, SDNode*> selectMULT(SDNode *N, unsigned Opc, SDLoc DL,
27                                          EVT Ty, bool HasLo, bool HasHi);
28 
29   SDValue getMips16SPAliasReg();
30 
31   bool runOnMachineFunction(MachineFunction &MF) override;
32 
33   void getMips16SPRefReg(SDNode *Parent, SDValue &AliasReg);
34 
35   bool selectAddr16(SDNode *Parent, SDValue N, SDValue &Base,
36                     SDValue &Offset, SDValue &Alias) override;
37 
38   std::pair<bool, SDNode*> selectNode(SDNode *Node) override;
39 
40   void processFunctionAfterISel(MachineFunction &MF) override;
41 
42   // Insert instructions to initialize the global base register in the
43   // first MBB of the function.
44   void initGlobalBaseReg(MachineFunction &MF);
45 
46   void initMips16SPAliasReg(MachineFunction &MF);
47 };
48 
49 FunctionPass *createMips16ISelDag(MipsTargetMachine &TM);
50 
51 }
52 
53 #endif
54