1 //==-- SystemZISelLowering.h - SystemZ DAG Lowering Interface ----*- C++ -*-==//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the interfaces that SystemZ uses to lower LLVM code into a
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_TARGET_SystemZ_ISELLOWERING_H
16 #define LLVM_TARGET_SystemZ_ISELLOWERING_H
19 #include "SystemZRegisterInfo.h"
20 #include "llvm/CodeGen/SelectionDAG.h"
21 #include "llvm/Target/TargetLowering.h"
24 namespace SystemZISD {
26 FIRST_NUMBER = ISD::BUILTIN_OP_END,
28 /// Return with a flag operand. Operand 0 is the chain operand.
31 /// CALL - These operations represent an abstract call
32 /// instruction, which includes a bunch of information.
35 /// PCRelativeWrapper - PC relative address
38 /// CMP, UCMP - Compare instruction
42 /// BRCOND - Conditional branch. Operand 0 is chain operand, operand 1 is
43 /// the block to branch if condition is true, operand 2 is condition code
44 /// and operand 3 is the flag operand produced by a CMP instruction.
47 /// SELECT - Operands 0 and 1 are selection variables, operand 2 is
48 /// condition code and operand 3 is the flag operand.
53 class SystemZSubtarget;
54 class SystemZTargetMachine;
56 class SystemZTargetLowering : public TargetLowering {
58 explicit SystemZTargetLowering(SystemZTargetMachine &TM);
60 virtual MVT getShiftAmountTy(EVT LHSTy) const { return MVT::i64; }
62 /// LowerOperation - Provide custom lowering hooks for some operations.
63 virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const;
65 /// getTargetNodeName - This method returns the name of a target specific
67 virtual const char *getTargetNodeName(unsigned Opcode) const;
69 /// getFunctionAlignment - Return the Log2 alignment of this function.
70 virtual unsigned getFunctionAlignment(const Function *F) const {
74 std::pair<unsigned, const TargetRegisterClass*>
75 getRegForInlineAsmConstraint(const std::string &Constraint, EVT VT) const;
76 TargetLowering::ConstraintType
77 getConstraintType(const std::string &Constraint) const;
79 SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG) const;
80 SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const;
81 SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
82 SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) const;
83 SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) const;
85 SDValue EmitCmp(SDValue LHS, SDValue RHS,
86 ISD::CondCode CC, SDValue &SystemZCC,
87 SelectionDAG &DAG) const;
90 MachineBasicBlock* EmitInstrWithCustomInserter(MachineInstr *MI,
91 MachineBasicBlock *BB) const;
93 /// isFPImmLegal - Returns true if the target can instruction select the
94 /// specified FP immediate natively. If false, the legalizer will
95 /// materialize the FP immediate as a load from a constant pool.
96 virtual bool isFPImmLegal(const APFloat &Imm, EVT VT) const;
99 SDValue LowerCCCCallTo(SDValue Chain, SDValue Callee,
100 CallingConv::ID CallConv, bool isVarArg,
102 const SmallVectorImpl<ISD::OutputArg> &Outs,
103 const SmallVectorImpl<SDValue> &OutVals,
104 const SmallVectorImpl<ISD::InputArg> &Ins,
105 DebugLoc dl, SelectionDAG &DAG,
106 SmallVectorImpl<SDValue> &InVals) const;
108 SDValue LowerCCCArguments(SDValue Chain,
109 CallingConv::ID CallConv,
111 const SmallVectorImpl<ISD::InputArg> &Ins,
114 SmallVectorImpl<SDValue> &InVals) const;
116 SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
117 CallingConv::ID CallConv, bool isVarArg,
118 const SmallVectorImpl<ISD::InputArg> &Ins,
119 DebugLoc dl, SelectionDAG &DAG,
120 SmallVectorImpl<SDValue> &InVals) const;
123 LowerFormalArguments(SDValue Chain,
124 CallingConv::ID CallConv, bool isVarArg,
125 const SmallVectorImpl<ISD::InputArg> &Ins,
126 DebugLoc dl, SelectionDAG &DAG,
127 SmallVectorImpl<SDValue> &InVals) const;
129 LowerCall(SDValue Chain, SDValue Callee,
130 CallingConv::ID CallConv, bool isVarArg, bool &isTailCall,
131 const SmallVectorImpl<ISD::OutputArg> &Outs,
132 const SmallVectorImpl<SDValue> &OutVals,
133 const SmallVectorImpl<ISD::InputArg> &Ins,
134 DebugLoc dl, SelectionDAG &DAG,
135 SmallVectorImpl<SDValue> &InVals) const;
138 LowerReturn(SDValue Chain,
139 CallingConv::ID CallConv, bool isVarArg,
140 const SmallVectorImpl<ISD::OutputArg> &Outs,
141 const SmallVectorImpl<SDValue> &OutVals,
142 DebugLoc dl, SelectionDAG &DAG) const;
144 const SystemZSubtarget &Subtarget;
145 const SystemZTargetMachine &TM;
146 const SystemZRegisterInfo *RegInfo;
150 #endif // LLVM_TARGET_SystemZ_ISELLOWERING_H