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/TAILCALL - 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 /// LowerOperation - Provide custom lowering hooks for some operations.
61 virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG);
63 /// getTargetNodeName - This method returns the name of a target specific
65 virtual const char *getTargetNodeName(unsigned Opcode) const;
67 SDValue LowerFORMAL_ARGUMENTS(SDValue Op, SelectionDAG &DAG);
68 SDValue LowerRET(SDValue Op, SelectionDAG &DAG);
69 SDValue LowerCALL(SDValue Op, SelectionDAG &DAG);
70 SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG);
71 SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG);
72 SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG);
74 SDValue LowerCCCArguments(SDValue Op, SelectionDAG &DAG);
75 SDValue LowerCCCCallTo(SDValue Op, SelectionDAG &DAG, unsigned CC);
76 SDNode* LowerCallResult(SDValue Chain, SDValue InFlag,
78 unsigned CallingConv, SelectionDAG &DAG);
80 SDValue EmitCmp(SDValue LHS, SDValue RHS,
81 ISD::CondCode CC, SDValue &SystemZCC,
85 MachineBasicBlock* EmitInstrWithCustomInserter(MachineInstr *MI,
86 MachineBasicBlock *BB) const;
89 const SystemZSubtarget &Subtarget;
90 const SystemZTargetMachine &TM;
91 const SystemZRegisterInfo *RegInfo;
95 #endif // LLVM_TARGET_SystemZ_ISELLOWERING_H