SystemZISelLowering.h revision 4ec3e5ffd10b23c3614cd9a766c2a3ec1fe62ba4 
1//==-- SystemZISelLowering.h - SystemZ 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 SystemZ uses to lower LLVM code into a
11// selection DAG.
12//
13//===----------------------------------------------------------------------===//
14
15#ifndef LLVM_TARGET_SystemZ_ISELLOWERING_H
16#define LLVM_TARGET_SystemZ_ISELLOWERING_H
17
18#include "SystemZ.h"
19#include "SystemZRegisterInfo.h"
20#include "llvm/CodeGen/SelectionDAG.h"
21#include "llvm/Target/TargetLowering.h"
22
23namespace llvm {
24  namespace SystemZISD {
25    enum {
26      FIRST_NUMBER = ISD::BUILTIN_OP_END,
27
28      /// Return with a flag operand. Operand 0 is the chain operand.
29      RET_FLAG,
30
31      /// CALL/TAILCALL - These operations represent an abstract call
32      /// instruction, which includes a bunch of information.
33      CALL,
34
35      CMP,
36      UCMP,
37      BRCOND
38    };
39  }
40
41  class SystemZSubtarget;
42  class SystemZTargetMachine;
43
44  class SystemZTargetLowering : public TargetLowering {
45  public:
46    explicit SystemZTargetLowering(SystemZTargetMachine &TM);
47
48    /// LowerOperation - Provide custom lowering hooks for some operations.
49    virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG);
50
51    /// getTargetNodeName - This method returns the name of a target specific
52    /// DAG node.
53    virtual const char *getTargetNodeName(unsigned Opcode) const;
54
55    SDValue LowerFORMAL_ARGUMENTS(SDValue Op, SelectionDAG &DAG);
56    SDValue LowerRET(SDValue Op, SelectionDAG &DAG);
57    SDValue LowerCALL(SDValue Op, SelectionDAG &DAG);
58    SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG);
59
60    SDValue LowerCCCArguments(SDValue Op, SelectionDAG &DAG);
61    SDValue LowerCCCCallTo(SDValue Op, SelectionDAG &DAG, unsigned CC);
62    SDNode* LowerCallResult(SDValue Chain, SDValue InFlag,
63                            CallSDNode *TheCall,
64                            unsigned CallingConv, SelectionDAG &DAG);
65
66    SDValue EmitCmp(SDValue LHS, SDValue RHS,
67                    ISD::CondCode CC, SDValue &SystemZCC,
68                    SelectionDAG &DAG);
69
70  private:
71    const SystemZSubtarget &Subtarget;
72    const SystemZTargetMachine &TM;
73    const SystemZRegisterInfo *RegInfo;
74  };
75} // namespace llvm
76
77#endif // LLVM_TARGET_SystemZ_ISELLOWERING_H
78