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     virtual unsigned getJumpTableEncoding() const;
  84
  85     /// LowerOperation - Provide custom lowering hooks for some operations.
  86     virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const;
  87
  88     /// ReplaceNodeResults - Replace the results of node with an illegal result
  89     /// type with new values built out of custom code.
  90     ///
  91     virtual void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue>&Results,
  92                                     SelectionDAG &DAG) const;
  93
  94     /// getTargetNodeName - This method returns the name of a target specific
  95     //  DAG node.
  96     virtual const char *getTargetNodeName(unsigned Opcode) const;
  97
  98     virtual MachineBasicBlock *
  99       EmitInstrWithCustomInserter(MachineInstr *MI,
 100                                   MachineBasicBlock *MBB) const;
 101
 102     virtual bool isLegalAddressingMode(const AddrMode &AM,
 103                                        const Type *Ty) const;
 104
 105     /// getFunctionAlignment - Return the Log2 alignment of this function.
 106     virtual unsigned getFunctionAlignment(const Function *F) const;
 107
 108   private:
 109     const XCoreTargetMachine &TM;
 110     const XCoreSubtarget &Subtarget;
 111
 112     // Lower Operand helpers
 113     SDValue LowerCCCArguments(SDValue Chain,
 114                               CallingConv::ID CallConv,
 115                               bool isVarArg,
 116                               const SmallVectorImpl<ISD::InputArg> &Ins,
 117                               DebugLoc dl, SelectionDAG &DAG,
 118                               SmallVectorImpl<SDValue> &InVals) const;
 119     SDValue LowerCCCCallTo(SDValue Chain, SDValue Callee,
 120                            CallingConv::ID CallConv, bool isVarArg,
 121                            bool isTailCall,
 122                            const SmallVectorImpl<ISD::OutputArg> &Outs,
 123                            const SmallVectorImpl<SDValue> &OutVals,
 124                            const SmallVectorImpl<ISD::InputArg> &Ins,
 125                            DebugLoc dl, SelectionDAG &DAG,
 126                            SmallVectorImpl<SDValue> &InVals) const;
 127     SDValue LowerCallResult(SDValue Chain, SDValue InFlag,
 128                             CallingConv::ID CallConv, bool isVarArg,
 129                             const SmallVectorImpl<ISD::InputArg> &Ins,
 130                             DebugLoc dl, SelectionDAG &DAG,
 131                             SmallVectorImpl<SDValue> &InVals) const;
 132     SDValue getReturnAddressFrameIndex(SelectionDAG &DAG) const;
 133     SDValue getGlobalAddressWrapper(SDValue GA, const GlobalValue *GV,
 134                                     SelectionDAG &DAG) const;
 135
 136     // Lower Operand specifics
 137     SDValue LowerLOAD(SDValue Op, SelectionDAG &DAG) const;
 138     SDValue LowerSTORE(SDValue Op, SelectionDAG &DAG) const;
 139     SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const;
 140     SDValue LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const;
 141     SDValue LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const;
 142     SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) const;
 143     SDValue LowerBR_JT(SDValue Op, SelectionDAG &DAG) const;
 144     SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const;
 145     SDValue LowerVAARG(SDValue Op, SelectionDAG &DAG) const;
 146     SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) const;
 147     SDValue LowerUMUL_LOHI(SDValue Op, SelectionDAG &DAG) const;
 148     SDValue LowerSMUL_LOHI(SDValue Op, SelectionDAG &DAG) const;
 149     SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const;
 150
 151     // Inline asm support
 152     std::vector<unsigned>
 153     getRegClassForInlineAsmConstraint(const std::string &Constraint,
 154               EVT VT) const;
 155
 156     // Expand specifics
 157     SDValue TryExpandADDWithMul(SDNode *Op, SelectionDAG &DAG) const;
 158     SDValue ExpandADDSUB(SDNode *Op, SelectionDAG &DAG) const;
 159
 160     virtual SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const;
 161
 162     virtual void computeMaskedBitsForTargetNode(const SDValue Op,
 163                                                 const APInt &Mask,
 164                                                 APInt &KnownZero,
 165                                                 APInt &KnownOne,
 166                                                 const SelectionDAG &DAG,
 167                                                 unsigned Depth = 0) const;
 168
 169     virtual SDValue
 170       LowerFormalArguments(SDValue Chain,
 171                            CallingConv::ID CallConv,
 172                            bool isVarArg,
 173                            const SmallVectorImpl<ISD::InputArg> &Ins,
 174                            DebugLoc dl, SelectionDAG &DAG,
 175                            SmallVectorImpl<SDValue> &InVals) const;
 176
 177     virtual SDValue
 178       LowerCall(SDValue Chain, SDValue Callee,
 179                 CallingConv::ID CallConv, bool isVarArg,
 180                 bool &isTailCall,
 181                 const SmallVectorImpl<ISD::OutputArg> &Outs,
 182                 const SmallVectorImpl<SDValue> &OutVals,
 183                 const SmallVectorImpl<ISD::InputArg> &Ins,
 184                 DebugLoc dl, SelectionDAG &DAG,
 185                 SmallVectorImpl<SDValue> &InVals) const;
 186
 187     virtual SDValue
 188       LowerReturn(SDValue Chain,
 189                   CallingConv::ID CallConv, bool isVarArg,
 190                   const SmallVectorImpl<ISD::OutputArg> &Outs,
 191                   const SmallVectorImpl<SDValue> &OutVals,
 192                   DebugLoc dl, SelectionDAG &DAG) const;
 193
 194     virtual bool
 195       CanLowerReturn(CallingConv::ID CallConv, bool isVarArg,
 196                      const SmallVectorImpl<EVT> &OutTys,
 197                      const SmallVectorImpl<ISD::ArgFlagsTy> &ArgsFlags,
 198                      LLVMContext &Context) const;
 199   };
 200 }
 201
 202 #endif // XCOREISELLOWERING_H