1 //===---- Mips16ISelDAGToDAG.h - A Dag to Dag Inst Selector for Mips ------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // Subclass of MipsDAGToDAGISel specialized for mips16.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef LLVM_LIB_TARGET_MIPS_MIPS16ISELDAGTODAG_H
14 #define LLVM_LIB_TARGET_MIPS_MIPS16ISELDAGTODAG_H
15 
16 #include "MipsISelDAGToDAG.h"
17 
18 namespace llvm {
19 
20 class Mips16DAGToDAGISel : public MipsDAGToDAGISel {
21 public:
22   explicit Mips16DAGToDAGISel(MipsTargetMachine &TM, CodeGenOptLevel OL)
23       : MipsDAGToDAGISel(TM, OL) {}
24 
25 private:
26   std::pair<SDNode *, SDNode *> selectMULT(SDNode *N, unsigned Opc,
27                                            const SDLoc &DL, EVT Ty, bool HasLo,
28                                            bool HasHi);
29 
30   bool runOnMachineFunction(MachineFunction &MF) override;
31 
32   bool selectAddr(bool SPAllowed, SDValue Addr, SDValue &Base,
33                   SDValue &Offset);
34   bool selectAddr16(SDValue Addr, SDValue &Base,
35                     SDValue &Offset) override;
36   bool selectAddr16SP(SDValue Addr, SDValue &Base,
37                       SDValue &Offset) override;
38 
39   bool trySelect(SDNode *Node) override;
40 
41   void processFunctionAfterISel(MachineFunction &MF) override;
42 
43   // Insert instructions to initialize the global base register in the
44   // first MBB of the function.
45   void initGlobalBaseReg(MachineFunction &MF);
46 
47   void initMips16SPAliasReg(MachineFunction &MF);
48 };
49 
50 FunctionPass *createMips16ISelDag(MipsTargetMachine &TM,
51                                   CodeGenOptLevel OptLevel);
52 }
53 
54 #endif
55