SparcISelLowering.h revision 158bf50787f1881fbdb6f62761d15aae0d3862f6 
1//===-- SparcISelLowering.h - Sparc 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 Sparc uses to lower LLVM code into a
11// selection DAG.
12//
13//===----------------------------------------------------------------------===//
14
15#ifndef SPARC_ISELLOWERING_H
16#define SPARC_ISELLOWERING_H
17
18#include "llvm/Target/TargetLowering.h"
19#include "Sparc.h"
20
21namespace llvm {
22  namespace SPISD {
23    enum {
24      FIRST_NUMBER = ISD::BUILTIN_OP_END,
25      CMPICC,      // Compare two GPR operands, set icc.
26      CMPFCC,      // Compare two FP operands, set fcc.
27      BRICC,       // Branch to dest on icc condition
28      BRFCC,       // Branch to dest on fcc condition
29      SELECT_ICC,  // Select between two values using the current ICC flags.
30      SELECT_FCC,  // Select between two values using the current FCC flags.
31
32      Hi, Lo,      // Hi/Lo operations, typically on a global address.
33
34      FTOI,        // FP to Int within a FP register.
35      ITOF,        // Int to FP within a FP register.
36
37      CALL,        // A call instruction.
38      RET_FLAG,    // Return with a flag operand.
39      GLOBAL_BASE_REG, // Global base reg for PIC
40      FLUSHW       // FLUSH register windows to stack
41    };
42  }
43
44  class SparcTargetLowering : public TargetLowering {
45  public:
46    SparcTargetLowering(TargetMachine &TM);
47    virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const;
48
49    /// computeMaskedBitsForTargetNode - Determine which of the bits specified
50    /// in Mask are known to be either zero or one and return them in the
51    /// KnownZero/KnownOne bitsets.
52    virtual void computeMaskedBitsForTargetNode(const SDValue Op,
53                                                const APInt &Mask,
54                                                APInt &KnownZero,
55                                                APInt &KnownOne,
56                                                const SelectionDAG &DAG,
57                                                unsigned Depth = 0) const;
58
59    virtual MachineBasicBlock *
60      EmitInstrWithCustomInserter(MachineInstr *MI,
61                                  MachineBasicBlock *MBB) const;
62
63    virtual const char *getTargetNodeName(unsigned Opcode) const;
64
65    ConstraintType getConstraintType(const std::string &Constraint) const;
66    std::pair<unsigned, const TargetRegisterClass*>
67    getRegForInlineAsmConstraint(const std::string &Constraint, EVT VT) const;
68
69    virtual bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const;
70
71    virtual SDValue
72      LowerFormalArguments(SDValue Chain,
73                           CallingConv::ID CallConv,
74                           bool isVarArg,
75                           const SmallVectorImpl<ISD::InputArg> &Ins,
76                           DebugLoc dl, SelectionDAG &DAG,
77                           SmallVectorImpl<SDValue> &InVals) const;
78
79    virtual SDValue
80      LowerCall(SDValue Chain, SDValue Callee,
81                CallingConv::ID CallConv, bool isVarArg,
82                bool &isTailCall,
83                const SmallVectorImpl<ISD::OutputArg> &Outs,
84                const SmallVectorImpl<SDValue> &OutVals,
85                const SmallVectorImpl<ISD::InputArg> &Ins,
86                DebugLoc dl, SelectionDAG &DAG,
87                SmallVectorImpl<SDValue> &InVals) const;
88
89    virtual SDValue
90      LowerReturn(SDValue Chain,
91                  CallingConv::ID CallConv, bool isVarArg,
92                  const SmallVectorImpl<ISD::OutputArg> &Outs,
93                  const SmallVectorImpl<SDValue> &OutVals,
94                  DebugLoc dl, SelectionDAG &DAG) const;
95
96    SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
97    SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) const;
98
99    unsigned getSRetArgSize(SelectionDAG &DAG, SDValue Callee) const;
100  };
101} // end namespace llvm
102
103#endif    // SPARC_ISELLOWERING_H
104