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 "Sparc.h"
  19 #include "llvm/Target/TargetLowering.h"
  20
  21 namespace llvm {
  22   class SparcSubtarget;
  23
  24   namespace SPISD {
  25     enum {
  26       FIRST_NUMBER = ISD::BUILTIN_OP_END,
  27       CMPICC,      // Compare two GPR operands, set icc+xcc.
  28       CMPFCC,      // Compare two FP operands, set fcc.
  29       BRICC,       // Branch to dest on icc condition
  30       BRXCC,       // Branch to dest on xcc condition (64-bit only).
  31       BRFCC,       // Branch to dest on fcc condition
  32       SELECT_ICC,  // Select between two values using the current ICC flags.
  33       SELECT_XCC,  // Select between two values using the current XCC flags.
  34       SELECT_FCC,  // Select between two values using the current FCC flags.
  35
  36       Hi, Lo,      // Hi/Lo operations, typically on a global address.
  37
  38       FTOI,        // FP to Int within a FP register.
  39       ITOF,        // Int to FP within a FP register.
  40       FTOX,        // FP to Int64 within a FP register.
  41       XTOF,        // Int64 to FP within a FP register.
  42
  43       CALL,        // A call instruction.
  44       RET_FLAG,    // Return with a flag operand.
  45       GLOBAL_BASE_REG, // Global base reg for PIC.
  46       FLUSHW,      // FLUSH register windows to stack.
  47
  48       TLS_ADD,     // For Thread Local Storage (TLS).
  49       TLS_LD,
  50       TLS_CALL
  51     };
  52   }
  53
  54   class SparcTargetLowering : public TargetLowering {
  55     const SparcSubtarget *Subtarget;
  56   public:
  57     SparcTargetLowering(TargetMachine &TM);
  58     SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
  59
  60     /// computeMaskedBitsForTargetNode - Determine which of the bits specified
  61     /// in Mask are known to be either zero or one and return them in the
  62     /// KnownZero/KnownOne bitsets.
  63     void computeMaskedBitsForTargetNode(const SDValue Op,
  64                                         APInt &KnownZero,
  65                                         APInt &KnownOne,
  66                                         const SelectionDAG &DAG,
  67                                         unsigned Depth = 0) const override;
  68
  69     MachineBasicBlock *
  70       EmitInstrWithCustomInserter(MachineInstr *MI,
  71                                   MachineBasicBlock *MBB) const override;
  72
  73     const char *getTargetNodeName(unsigned Opcode) const override;
  74
  75     ConstraintType getConstraintType(const std::string &Constraint) const override;
  76     ConstraintWeight
  77     getSingleConstraintMatchWeight(AsmOperandInfo &info,
  78                                    const char *constraint) const override;
  79     void LowerAsmOperandForConstraint(SDValue Op,
  80                                       std::string &Constraint,
  81                                       std::vector<SDValue> &Ops,
  82                                       SelectionDAG &DAG) const override;
  83     std::pair<unsigned, const TargetRegisterClass*>
  84     getRegForInlineAsmConstraint(const std::string &Constraint, MVT VT) const override;
  85
  86     bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const override;
  87     MVT getScalarShiftAmountTy(EVT LHSTy) const override { return MVT::i32; }
  88
  89     /// getSetCCResultType - Return the ISD::SETCC ValueType
  90     EVT getSetCCResultType(LLVMContext &Context, EVT VT) const override;
  91
  92     SDValue
  93       LowerFormalArguments(SDValue Chain,
  94                            CallingConv::ID CallConv,
  95                            bool isVarArg,
  96                            const SmallVectorImpl<ISD::InputArg> &Ins,
  97                            SDLoc dl, SelectionDAG &DAG,
  98                            SmallVectorImpl<SDValue> &InVals) const override;
  99     SDValue LowerFormalArguments_32(SDValue Chain,
 100                                     CallingConv::ID CallConv,
 101                                     bool isVarArg,
 102                                     const SmallVectorImpl<ISD::InputArg> &Ins,
 103                                     SDLoc dl, SelectionDAG &DAG,
 104                                     SmallVectorImpl<SDValue> &InVals) const;
 105     SDValue LowerFormalArguments_64(SDValue Chain,
 106                                     CallingConv::ID CallConv,
 107                                     bool isVarArg,
 108                                     const SmallVectorImpl<ISD::InputArg> &Ins,
 109                                     SDLoc dl, SelectionDAG &DAG,
 110                                     SmallVectorImpl<SDValue> &InVals) const;
 111
 112     SDValue
 113       LowerCall(TargetLowering::CallLoweringInfo &CLI,
 114                 SmallVectorImpl<SDValue> &InVals) const override;
 115     SDValue LowerCall_32(TargetLowering::CallLoweringInfo &CLI,
 116                          SmallVectorImpl<SDValue> &InVals) const;
 117     SDValue LowerCall_64(TargetLowering::CallLoweringInfo &CLI,
 118                          SmallVectorImpl<SDValue> &InVals) const;
 119
 120     SDValue
 121       LowerReturn(SDValue Chain,
 122                   CallingConv::ID CallConv, bool isVarArg,
 123                   const SmallVectorImpl<ISD::OutputArg> &Outs,
 124                   const SmallVectorImpl<SDValue> &OutVals,
 125                   SDLoc dl, SelectionDAG &DAG) const override;
 126     SDValue LowerReturn_32(SDValue Chain,
 127                            CallingConv::ID CallConv, bool IsVarArg,
 128                            const SmallVectorImpl<ISD::OutputArg> &Outs,
 129                            const SmallVectorImpl<SDValue> &OutVals,
 130                            SDLoc DL, SelectionDAG &DAG) const;
 131     SDValue LowerReturn_64(SDValue Chain,
 132                            CallingConv::ID CallConv, bool IsVarArg,
 133                            const SmallVectorImpl<ISD::OutputArg> &Outs,
 134                            const SmallVectorImpl<SDValue> &OutVals,
 135                            SDLoc DL, SelectionDAG &DAG) const;
 136
 137     SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
 138     SDValue LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const;
 139     SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) const;
 140     SDValue LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const;
 141
 142     unsigned getSRetArgSize(SelectionDAG &DAG, SDValue Callee) const;
 143     SDValue withTargetFlags(SDValue Op, unsigned TF, SelectionDAG &DAG) const;
 144     SDValue makeHiLoPair(SDValue Op, unsigned HiTF, unsigned LoTF,
 145                          SelectionDAG &DAG) const;
 146     SDValue makeAddress(SDValue Op, SelectionDAG &DAG) const;
 147
 148     SDValue LowerF128_LibCallArg(SDValue Chain, ArgListTy &Args,
 149                                  SDValue Arg, SDLoc DL,
 150                                  SelectionDAG &DAG) const;
 151     SDValue LowerF128Op(SDValue Op, SelectionDAG &DAG,
 152                         const char *LibFuncName,
 153                         unsigned numArgs) const;
 154     SDValue LowerF128Compare(SDValue LHS, SDValue RHS,
 155                              unsigned &SPCC,
 156                              SDLoc DL,
 157                              SelectionDAG &DAG) const;
 158
 159     bool ShouldShrinkFPConstant(EVT VT) const override {
 160       // Do not shrink FP constpool if VT == MVT::f128.
 161       // (ldd, call _Q_fdtoq) is more expensive than two ldds.
 162       return VT != MVT::f128;
 163     }
 164
 165     void ReplaceNodeResults(SDNode *N,
 166                                     SmallVectorImpl<SDValue>& Results,
 167                                     SelectionDAG &DAG) const override;
 168
 169     MachineBasicBlock *expandSelectCC(MachineInstr *MI, MachineBasicBlock *BB,
 170                                       unsigned BROpcode) const;
 171     MachineBasicBlock *expandAtomicRMW(MachineInstr *MI,
 172                                        MachineBasicBlock *BB,
 173                                        unsigned Opcode,
 174                                        unsigned CondCode = 0) const;
 175   };
 176 } // end namespace llvm
 177
 178 #endif    // SPARC_ISELLOWERING_H