lib/Target/ARM/ARMISelLowering.h

   1 //===-- ARMISelLowering.h - ARM 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 ARM uses to lower LLVM code into a
  11 // selection DAG.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #ifndef ARMISELLOWERING_H
  16 #define ARMISELLOWERING_H
  17
  18 #include "ARMSubtarget.h"
  19 #include "llvm/Target/TargetLowering.h"
  20 #include "llvm/CodeGen/SelectionDAG.h"
  21 #include "llvm/CodeGen/CallingConvLower.h"
  22 #include <vector>
  23
  24 namespace llvm {
  25   class ARMConstantPoolValue;
  26
  27   namespace ARMISD {
  28     // ARM Specific DAG Nodes
  29     enum NodeType {
  30       // Start the numbering where the builting ops and target ops leave off.
  31       FIRST_NUMBER = ISD::BUILTIN_OP_END,
  32
  33       Wrapper,      // Wrapper - A wrapper node for TargetConstantPool,
  34                     // TargetExternalSymbol, and TargetGlobalAddress.
  35       WrapperJT,    // WrapperJT - A wrapper node for TargetJumpTable
  36
  37       CALL,         // Function call.
  38       CALL_PRED,    // Function call that's predicable.
  39       CALL_NOLINK,  // Function call with branch not branch-and-link.
  40       tCALL,        // Thumb function call.
  41       BRCOND,       // Conditional branch.
  42       BR_JT,        // Jumptable branch.
  43       RET_FLAG,     // Return with a flag operand.
  44
  45       PIC_ADD,      // Add with a PC operand and a PIC label.
  46
  47       CMP,          // ARM compare instructions.
  48       CMPNZ,        // ARM compare that uses only N or Z flags.
  49       CMPFP,        // ARM VFP compare instruction, sets FPSCR.
  50       CMPFPw0,      // ARM VFP compare against zero instruction, sets FPSCR.
  51       FMSTAT,       // ARM fmstat instruction.
  52       CMOV,         // ARM conditional move instructions.
  53       CNEG,         // ARM conditional negate instructions.
  54
  55       FTOSI,        // FP to sint within a FP register.
  56       FTOUI,        // FP to uint within a FP register.
  57       SITOF,        // sint to FP within a FP register.
  58       UITOF,        // uint to FP within a FP register.
  59
  60       SRL_FLAG,     // V,Flag = srl_flag X -> srl X, 1 + save carry out.
  61       SRA_FLAG,     // V,Flag = sra_flag X -> sra X, 1 + save carry out.
  62       RRX,          // V = RRX X, Flag     -> srl X, 1 + shift in carry flag.
  63
  64       FMRRD,        // double to two gprs.
  65       FMDRR,         // Two gprs to double.
  66
  67       THREAD_POINTER
  68     };
  69   }
  70
  71   //===----------------------------------------------------------------------===//
  72   //  ARMTargetLowering - ARM Implementation of the TargetLowering interface
  73
  74   class ARMTargetLowering : public TargetLowering {
  75     int VarArgsFrameIndex;            // FrameIndex for start of varargs area.
  76   public:
  77     explicit ARMTargetLowering(TargetMachine &TM);
  78
  79     virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG);
  80
  81     /// ReplaceNodeResults - Replace the results of node with an illegal result
  82     /// type with new values built out of custom code.
  83     ///
  84     virtual void ReplaceNodeResults(SDNode *N, SmallVectorImpl<SDValue>&Results,
  85                                     SelectionDAG &DAG);
  86
  87     virtual SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const;
  88
  89     virtual const char *getTargetNodeName(unsigned Opcode) const;
  90
  91     virtual MachineBasicBlock *EmitInstrWithCustomInserter(MachineInstr *MI,
  92                                                   MachineBasicBlock *MBB) const;
  93
  94     /// isLegalAddressingMode - Return true if the addressing mode represented
  95     /// by AM is legal for this target, for a load/store of the specified type.
  96     virtual bool isLegalAddressingMode(const AddrMode &AM, const Type *Ty)const;
  97
  98     /// getPreIndexedAddressParts - returns true by value, base pointer and
  99     /// offset pointer and addressing mode by reference if the node's address
 100     /// can be legally represented as pre-indexed load / store address.
 101     virtual bool getPreIndexedAddressParts(SDNode *N, SDValue &Base,
 102                                            SDValue &Offset,
 103                                            ISD::MemIndexedMode &AM,
 104                                            SelectionDAG &DAG) const;
 105
 106     /// getPostIndexedAddressParts - returns true by value, base pointer and
 107     /// offset pointer and addressing mode by reference if this node can be
 108     /// combined with a load / store to form a post-indexed load / store.
 109     virtual bool getPostIndexedAddressParts(SDNode *N, SDNode *Op,
 110                                             SDValue &Base, SDValue &Offset,
 111                                             ISD::MemIndexedMode &AM,
 112                                             SelectionDAG &DAG) const;
 113
 114     virtual void computeMaskedBitsForTargetNode(const SDValue Op,
 115                                                 const APInt &Mask,
 116                                                 APInt &KnownZero,
 117                                                 APInt &KnownOne,
 118                                                 const SelectionDAG &DAG,
 119                                                 unsigned Depth) const;
 120     ConstraintType getConstraintType(const std::string &Constraint) const;
 121     std::pair<unsigned, const TargetRegisterClass*>
 122       getRegForInlineAsmConstraint(const std::string &Constraint,
 123                                    MVT VT) const;
 124     std::vector<unsigned>
 125     getRegClassForInlineAsmConstraint(const std::string &Constraint,
 126                                       MVT VT) const;
 127
 128     /// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
 129     /// vector.  If it is invalid, don't add anything to Ops. If hasMemory is
 130     /// true it means one of the asm constraint of the inline asm instruction
 131     /// being processed is 'm'.
 132     virtual void LowerAsmOperandForConstraint(SDValue Op,
 133                                               char ConstraintLetter,
 134                                               bool hasMemory,
 135                                               std::vector<SDValue> &Ops,
 136                                               SelectionDAG &DAG) const;
 137
 138     virtual const ARMSubtarget* getSubtarget() {
 139       return Subtarget;
 140     }
 141
 142   private:
 143     /// Subtarget - Keep a pointer to the ARMSubtarget around so that we can
 144     /// make the right decision when generating code for different targets.
 145     const ARMSubtarget *Subtarget;
 146
 147     /// ARMPCLabelIndex - Keep track the number of ARM PC labels created.
 148     ///
 149     unsigned ARMPCLabelIndex;
 150
 151     SDValue LowerMemOpCallTo(CallSDNode *TheCall, SelectionDAG &DAG,
 152                              const SDValue &StackPtr, const CCValAssign &VA,
 153                              SDValue Chain, SDValue Arg, ISD::ArgFlagsTy Flags);
 154     SDNode *LowerCallResult(SDValue Chain, SDValue InFlag, CallSDNode *TheCall,
 155                             unsigned CallingConv, SelectionDAG &DAG);
 156     SDValue LowerCALL(SDValue Op, SelectionDAG &DAG);
 157     SDValue LowerRET(SDValue Op, SelectionDAG &DAG);
 158     SDValue LowerGlobalAddressDarwin(SDValue Op, SelectionDAG &DAG);
 159     SDValue LowerGlobalAddressELF(SDValue Op, SelectionDAG &DAG);
 160     SDValue LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG);
 161     SDValue LowerToTLSGeneralDynamicModel(GlobalAddressSDNode *GA,
 162                                             SelectionDAG &DAG);
 163     SDValue LowerToTLSExecModels(GlobalAddressSDNode *GA,
 164                                    SelectionDAG &DAG);
 165     SDValue LowerGLOBAL_OFFSET_TABLE(SDValue Op, SelectionDAG &DAG);
 166     SDValue LowerFORMAL_ARGUMENTS(SDValue Op, SelectionDAG &DAG);
 167     SDValue LowerBR_JT(SDValue Op, SelectionDAG &DAG);
 168
 169     SDValue EmitTargetCodeForMemcpy(SelectionDAG &DAG, DebugLoc dl,
 170                                       SDValue Chain,
 171                                       SDValue Dst, SDValue Src,
 172                                       SDValue Size, unsigned Align,
 173                                       bool AlwaysInline,
 174                                       const Value *DstSV, uint64_t DstSVOff,
 175                                       const Value *SrcSV, uint64_t SrcSVOff);
 176   };
 177 }
 178
 179 #endif  // ARMISELLOWERING_H