lib/Target/IA64/IA64ISelLowering.h

   1 //===-- IA64ISelLowering.h - IA64 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 IA64 uses to lower LLVM code into a
  11 // selection DAG.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #ifndef LLVM_TARGET_IA64_IA64ISELLOWERING_H
  16 #define LLVM_TARGET_IA64_IA64ISELLOWERING_H
  17
  18 #include "llvm/Target/TargetLowering.h"
  19 #include "llvm/CodeGen/SelectionDAG.h"
  20 #include "IA64.h"
  21
  22 namespace llvm {
  23   namespace IA64ISD {
  24     enum NodeType {
  25       // Start the numbering where the builting ops and target ops leave off.
  26       FIRST_NUMBER = ISD::BUILTIN_OP_END,
  27
  28       /// GETFD - the getf.d instruction takes a floating point operand and
  29       /// returns its 64-bit memory representation as an i64
  30       GETFD,
  31
  32       // TODO: explain this hack
  33       BRCALL,
  34
  35       // RET_FLAG - Return with a flag operand
  36       RET_FLAG
  37     };
  38   }
  39
  40   class IA64TargetLowering : public TargetLowering {
  41     int VarArgsFrameIndex;            // FrameIndex for start of varargs area.
  42     //int ReturnAddrIndex;              // FrameIndex for return slot.
  43     unsigned GP, SP, RP; // FIXME - clean this mess up
  44   public:
  45     explicit IA64TargetLowering(TargetMachine &TM);
  46
  47     unsigned VirtGPR; // this is public so it can be accessed in the selector
  48                       // for ISD::RET. add an accessor instead? FIXME
  49     const char *getTargetNodeName(unsigned Opcode) const;
  50
  51     /// getSetCCResultType: return ISD::SETCC's result type.
  52     virtual MVT getSetCCResultType(MVT VT) const;
  53
  54     /// LowerArguments - This hook must be implemented to indicate how we should
  55     /// lower the arguments for the specified function, into the specified DAG.
  56     virtual void LowerArguments(Function &F, SelectionDAG &DAG,
  57                                 SmallVectorImpl<SDValue> &ArgValues,
  58                                 DebugLoc dl);
  59
  60     /// LowerCallTo - This hook lowers an abstract call to a function into an
  61     /// actual call.
  62     virtual std::pair<SDValue, SDValue>
  63       LowerCallTo(SDValue Chain, const Type *RetTy,
  64                   bool RetSExt, bool RetZExt, bool isVarArg, bool isInreg,
  65                   unsigned CC, bool isTailCall,
  66                   SDValue Callee, ArgListTy &Args, SelectionDAG &DAG,
  67                   DebugLoc dl);
  68
  69     /// LowerOperation - for custom lowering specific ops
  70     /// (currently, only "ret void")
  71     virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG);
  72
  73   };
  74 }
  75
  76 #endif   // LLVM_TARGET_IA64_IA64ISELLOWERING_H