several major improvements to the sparc backend: support for weak linkage
[oota-llvm.git] / lib / Target / Sparc / SparcISelLowering.h
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
21 namespace 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     };
41   }
42
43   class SparcTargetLowering : public TargetLowering {
44     int VarArgsFrameOffset;   // Frame offset to start of varargs area.
45   public:
46     SparcTargetLowering(TargetMachine &TM);
47     virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG);
48
49     int getVarArgsFrameOffset() const { return VarArgsFrameOffset; }
50
51     /// computeMaskedBitsForTargetNode - Determine which of the bits specified
52     /// in Mask are known to be either zero or one and return them in the
53     /// KnownZero/KnownOne bitsets.
54     virtual void computeMaskedBitsForTargetNode(const SDValue Op,
55                                                 const APInt &Mask,
56                                                 APInt &KnownZero,
57                                                 APInt &KnownOne,
58                                                 const SelectionDAG &DAG,
59                                                 unsigned Depth = 0) const;
60
61     virtual MachineBasicBlock *EmitInstrWithCustomInserter(MachineInstr *MI,
62                                                    MachineBasicBlock *MBB) const;
63
64     virtual const char *getTargetNodeName(unsigned Opcode) const;
65
66     ConstraintType getConstraintType(const std::string &Constraint) const;
67     std::pair<unsigned, const TargetRegisterClass*>
68     getRegForInlineAsmConstraint(const std::string &Constraint, EVT VT) const;
69     std::vector<unsigned>
70     getRegClassForInlineAsmConstraint(const std::string &Constraint,
71                                       EVT VT) const;
72
73     virtual bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const;
74
75     /// getFunctionAlignment - Return the Log2 alignment of this function.
76     virtual unsigned getFunctionAlignment(const Function *F) const;
77
78     virtual SDValue
79       LowerFormalArguments(SDValue Chain,
80                            CallingConv::ID CallConv,
81                            bool isVarArg,
82                            const SmallVectorImpl<ISD::InputArg> &Ins,
83                            DebugLoc dl, SelectionDAG &DAG,
84                            SmallVectorImpl<SDValue> &InVals);
85
86     virtual SDValue
87       LowerCall(SDValue Chain, SDValue Callee,
88                 CallingConv::ID CallConv, bool isVarArg,
89                 bool isTailCall,
90                 const SmallVectorImpl<ISD::OutputArg> &Outs,
91                 const SmallVectorImpl<ISD::InputArg> &Ins,
92                 DebugLoc dl, SelectionDAG &DAG,
93                 SmallVectorImpl<SDValue> &InVals);
94
95     virtual SDValue
96       LowerReturn(SDValue Chain,
97                   CallingConv::ID CallConv, bool isVarArg,
98                   const SmallVectorImpl<ISD::OutputArg> &Outs,
99                   DebugLoc dl, SelectionDAG &DAG);
100
101     SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG);
102     SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG);
103   };
104 } // end namespace llvm
105
106 #endif    // SPARC_ISELLOWERING_H