1 //===-- SIISelLowering.h - SI 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 // SI DAG Lowering interface definition
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef SIISELLOWERING_H
15 #define SIISELLOWERING_H
16 
17 #include "AMDGPUISelLowering.h"
18 #include "SIInstrInfo.h"
19 
20 namespace llvm {
21 
22 class SITargetLowering : public AMDGPUTargetLowering
23 {
24   const SIInstrInfo * TII;
25 
26   /// AppendS_WAITCNT - Memory reads and writes are syncronized using the
27   /// S_WAITCNT instruction.  This function takes the most conservative
28   /// approach and inserts an S_WAITCNT instruction after every read and
29   /// write.
30   void AppendS_WAITCNT(MachineInstr *MI, MachineBasicBlock &BB,
31               MachineBasicBlock::iterator I) const;
32   void LowerSI_INTERP(MachineInstr *MI, MachineBasicBlock &BB,
33               MachineBasicBlock::iterator I, MachineRegisterInfo & MRI) const;
34   void LowerSI_INTERP_CONST(MachineInstr *MI, MachineBasicBlock &BB,
35               MachineBasicBlock::iterator I, MachineRegisterInfo &MRI) const;
36   void LowerSI_KIL(MachineInstr *MI, MachineBasicBlock &BB,
37               MachineBasicBlock::iterator I, MachineRegisterInfo & MRI) const;
38   void LowerSI_V_CNDLT(MachineInstr *MI, MachineBasicBlock &BB,
39               MachineBasicBlock::iterator I, MachineRegisterInfo & MRI) const;
40 
41   SDValue Loweri1ContextSwitch(SDValue Op, SelectionDAG &DAG,
42                                            unsigned VCCNode) const;
43   SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG) const;
44   SDValue LowerLOAD(SDValue Op, SelectionDAG &DAG) const;
45   SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const;
46 
47 public:
48   SITargetLowering(TargetMachine &tm);
49   virtual MachineBasicBlock * EmitInstrWithCustomInserter(MachineInstr * MI,
50                                               MachineBasicBlock * BB) const;
51   virtual EVT getSetCCResultType(EVT VT) const;
52   virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const;
53   virtual SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const;
54   virtual const char* getTargetNodeName(unsigned Opcode) const;
55 };
56 
57 } // End namespace llvm
58 
59 #endif //SIISELLOWERING_H
60