lib/Target/XCore/XCoreISelLowering.h

   1 //===-- XCoreISelLowering.h - XCore 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 XCore uses to lower LLVM code into a
  11 // selection DAG.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #ifndef XCOREISELLOWERING_H
  16 #define XCOREISELLOWERING_H
  17
  18 #include "llvm/CodeGen/SelectionDAG.h"
  19 #include "llvm/Target/TargetLowering.h"
  20 #include "XCore.h"
  21
  22 namespace llvm {
  23
  24   // Forward delcarations
  25   class XCoreSubtarget;
  26   class XCoreTargetMachine;
  27
  28   namespace XCoreISD {
  29     enum NodeType {
  30       // Start the numbering where the builtin ops and target ops leave off.
  31       FIRST_NUMBER = ISD::BUILTIN_OP_END,
  32
  33       // Branch and link (call)
  34       BL,
  35
  36       // pc relative address
  37       PCRelativeWrapper,
  38
  39       // dp relative address
  40       DPRelativeWrapper,
  41
  42       // cp relative address
  43       CPRelativeWrapper,
  44
  45       // Store word to stack
  46       STWSP,
  47
  48       // Corresponds to retsp instruction
  49       RETSP,
  50
  51       // Corresponds to LADD instruction
  52       LADD,
  53
  54       // Corresponds to LSUB instruction
  55       LSUB,
  56
  57       // Corresponds to LMUL instruction
  58       LMUL,
  59
  60       // Corresponds to MACCU instruction
  61       MACCU,
  62
  63       // Corresponds to MACCS instruction
  64       MACCS,
  65
  66       // Jumptable branch.
  67       BR_JT,
  68
  69       // Jumptable branch using long branches for each entry.
  70       BR_JT32
  71     };
  72   }
  73
  74   //===--------------------------------------------------------------------===//
  75   // TargetLowering Implementation
  76   //===--------------------------------------------------------------------===//
  77   class XCoreTargetLowering : public TargetLowering
  78   {
  79   public:
  80
  81     explicit XCoreTargetLowering(XCoreTargetMachine &TM);
  82
  83     /// LowerOperation - Provide custom lowering hooks for some operations.
  84     virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG);
  85
  86     /// ReplaceNodeResults - Replace the results of node with an illegal result
  87     /// type with new values built out of custom code.
  88     ///
  89     virtual void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue>&Results,
  90                                     SelectionDAG &DAG);
  91
  92     /// getTargetNodeName - This method returns the name of a target specific
  93     //  DAG node.
  94     virtual const char *getTargetNodeName(unsigned Opcode) const;
  95
  96     virtual MachineBasicBlock *EmitInstrWithCustomInserter(MachineInstr *MI,
  97                                                          MachineBasicBlock *MBB,
  98                     DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM) const;
  99
 100     virtual bool isLegalAddressingMode(const AddrMode &AM,
 101                                        const Type *Ty) const;
 102
 103     /// getFunctionAlignment - Return the Log2 alignment of this function.
 104     virtual unsigned getFunctionAlignment(const Function *F) const;
 105
 106   private:
 107     const XCoreTargetMachine &TM;
 108     const XCoreSubtarget &Subtarget;
 109
 110     // Lower Operand helpers
 111     SDValue LowerCCCArguments(SDValue Chain,
 112                               CallingConv::ID CallConv,
 113                               bool isVarArg,
 114                               const SmallVectorImpl<ISD::InputArg> &Ins,
 115                               DebugLoc dl, SelectionDAG &DAG,
 116                               SmallVectorImpl<SDValue> &InVals);
 117     SDValue LowerCCCCallTo(SDValue Chain, SDValue Callee,
 118                            CallingConv::ID CallConv, bool isVarArg,
 119                            bool isTailCall,
 120                            const SmallVectorImpl<ISD::OutputArg> &Outs,
 121                            const SmallVectorImpl<ISD::InputArg> &Ins,
 122                            DebugLoc dl, SelectionDAG &DAG,
 123                            SmallVectorImpl<SDValue> &InVals);
 124     SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
 125                             CallingConv::ID CallConv, bool isVarArg,
 126                             const SmallVectorImpl<ISD::InputArg> &Ins,
 127                             DebugLoc dl, SelectionDAG &DAG,
 128                             SmallVectorImpl<SDValue> &InVals);
 129     SDValue getReturnAddressFrameIndex(SelectionDAG &DAG);
 130     SDValue getGlobalAddressWrapper(SDValue GA, GlobalValue *GV,
 131                                     SelectionDAG &DAG);
 132
 133     // Lower Operand specifics
 134     SDValue LowerLOAD(SDValue Op, SelectionDAG &DAG);
 135     SDValue LowerSTORE(SDValue Op, SelectionDAG &DAG);
 136     SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG);
 137     SDValue LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG);
 138     SDValue LowerBlockAddress(SDValue Op, SelectionDAG &DAG);
 139     SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG);
 140     SDValue LowerBR_JT(SDValue Op, SelectionDAG &DAG);
 141     SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG);
 142     SDValue LowerVAARG(SDValue Op, SelectionDAG &DAG);
 143     SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG);
 144     SDValue LowerUMUL_LOHI(SDValue Op, SelectionDAG &DAG);
 145     SDValue LowerSMUL_LOHI(SDValue Op, SelectionDAG &DAG);
 146     SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG);
 147
 148     // Inline asm support
 149     std::vector<unsigned>
 150     getRegClassForInlineAsmConstraint(const std::string &Constraint,
 151               EVT VT) const;
 152
 153     // Expand specifics
 154     SDValue TryExpandADDWithMul(SDNode *Op, SelectionDAG &DAG);
 155     SDValue ExpandADDSUB(SDNode *Op, SelectionDAG &DAG);
 156
 157     virtual SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const;
 158
 159     virtual void computeMaskedBitsForTargetNode(const SDValue Op,
 160                                                 const APInt &Mask,
 161                                                 APInt &KnownZero,
 162                                                 APInt &KnownOne,
 163                                                 const SelectionDAG &DAG,
 164                                                 unsigned Depth = 0) const;
 165
 166     virtual SDValue
 167       LowerFormalArguments(SDValue Chain,
 168                            CallingConv::ID CallConv,
 169                            bool isVarArg,
 170                            const SmallVectorImpl<ISD::InputArg> &Ins,
 171                            DebugLoc dl, SelectionDAG &DAG,
 172                            SmallVectorImpl<SDValue> &InVals);
 173
 174     virtual SDValue
 175       LowerCall(SDValue Chain, SDValue Callee,
 176                 CallingConv::ID CallConv, bool isVarArg,
 177                 bool &isTailCall,
 178                 const SmallVectorImpl<ISD::OutputArg> &Outs,
 179                 const SmallVectorImpl<ISD::InputArg> &Ins,
 180                 DebugLoc dl, SelectionDAG &DAG,
 181                 SmallVectorImpl<SDValue> &InVals);
 182
 183     virtual SDValue
 184       LowerReturn(SDValue Chain,
 185                   CallingConv::ID CallConv, bool isVarArg,
 186                   const SmallVectorImpl<ISD::OutputArg> &Outs,
 187                   DebugLoc dl, SelectionDAG &DAG);
 188
 189     virtual bool
 190       CanLowerReturn(CallingConv::ID CallConv, bool isVarArg,
 191                      const SmallVectorImpl<EVT> &OutTys,
 192                      const SmallVectorImpl<ISD::ArgFlagsTy> &ArgsFlags,
 193                      SelectionDAG &DAG);
 194   };
 195 }
 196
 197 #endif // XCOREISELLOWERING_H