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//===-- PIC16ISelLowering.h - PIC16 DAG Lowering Interface ------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the interfaces that PIC16 uses to lower LLVM code into a
// selection DAG.
//
//===----------------------------------------------------------------------===//
#ifndef PIC16ISELLOWERING_H
#define PIC16ISELLOWERING_H
#include "PIC16.h"
#include "PIC16Subtarget.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/Target/TargetLowering.h"
#include <map>
namespace llvm {
namespace PIC16ISD {
enum NodeType {
// Start the numbering from where ISD NodeType finishes.
FIRST_NUMBER = ISD::BUILTIN_OP_END,
Lo, // Low 8-bits of GlobalAddress.
Hi, // High 8-bits of GlobalAddress.
PIC16Load,
PIC16LdArg, // This is replica of PIC16Load but used to load function
// arguments and is being used for facilitating for some
// store removal optimizations.
PIC16LdWF,
PIC16Store,
PIC16StWF,
Banksel,
MTLO,
MTHI,
BCF,
LSLF, // PIC16 Logical shift left
LRLF, // PIC16 Logical shift right
RLF, // Rotate left through carry
RRF, // Rotate right through carry
CALL, // PIC16 Call instruction
SUBCC, // Compare for equality or inequality.
SELECT_ICC, // Psuedo to be caught in schedular and expanded to brcond.
BRCOND, // Conditional branch.
PIC16StopPoint,
Dummy
};
// Keep track of different address spaces.
enum AddressSpace {
RAM_SPACE = 0, // RAM address space
ROM_SPACE = 1 // ROM address space number is 1
};
enum PIC16Libcall {
MUL_I8,
SRA_I8,
SLL_I8,
SRL_I8,
PIC16UnknownCall
};
}
//===--------------------------------------------------------------------===//
// TargetLowering Implementation
//===--------------------------------------------------------------------===//
class PIC16TargetLowering : public TargetLowering {
public:
explicit PIC16TargetLowering(PIC16TargetMachine &TM);
/// getTargetNodeName - This method returns the name of a target specific
/// DAG node.
virtual const char *getTargetNodeName(unsigned Opcode) const;
/// getSetCCResultType - Return the ISD::SETCC ValueType
virtual MVT getSetCCResultType(MVT ValType) const;
SDValue LowerFORMAL_ARGUMENTS(SDValue Op, SelectionDAG &DAG);
SDValue LowerShift(SDValue Op, SelectionDAG &DAG);
SDValue LowerADD(SDValue Op, SelectionDAG &DAG);
SDValue LowerSUB(SDValue Op, SelectionDAG &DAG);
SDValue LowerBinOp(SDValue Op, SelectionDAG &DAG);
SDValue LowerCALL(SDValue Op, SelectionDAG &DAG);
SDValue LowerRET(SDValue Op, SelectionDAG &DAG);
SDValue LowerCallReturn(SDValue Op, SDValue Chain, SDValue FrameAddress,
SDValue InFlag, SelectionDAG &DAG);
SDValue LowerCallArguments(SDValue Op, SDValue Chain, SDValue FrameAddress,
SDValue InFlag, SelectionDAG &DAG);
SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG);
SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG);
SDValue LowerStopPoint(SDValue Op, SelectionDAG &DAG);
SDValue getPIC16Cmp(SDValue LHS, SDValue RHS, unsigned OrigCC, SDValue &CC,
SelectionDAG &DAG, DebugLoc dl);
virtual MachineBasicBlock *EmitInstrWithCustomInserter(MachineInstr *MI,
MachineBasicBlock *MBB) const;
virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG);
virtual void ReplaceNodeResults(SDNode *N,
SmallVectorImpl<SDValue> &Results,
SelectionDAG &DAG);
virtual void LowerOperationWrapper(SDNode *N,
SmallVectorImpl<SDValue> &Results,
SelectionDAG &DAG);
SDValue ExpandStore(SDNode *N, SelectionDAG &DAG);
SDValue ExpandLoad(SDNode *N, SelectionDAG &DAG);
SDValue ExpandGlobalAddress(SDNode *N, SelectionDAG &DAG);
SDValue ExpandExternalSymbol(SDNode *N, SelectionDAG &DAG);
SDValue ExpandFrameIndex(SDNode *N, SelectionDAG &DAG);
SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue PerformPIC16LoadCombine(SDNode *N, DAGCombinerInfo &DCI) const;
SDValue PerformStoreCombine(SDNode *N, DAGCombinerInfo &DCI) const;
// This function returns the Tmp Offset for FrameIndex. If any TmpOffset
// already exists for the FI then it returns the same else it creates the
// new offset and returns.
unsigned GetTmpOffsetForFI(unsigned FI);
void ResetTmpOffsetMap() { FiTmpOffsetMap.clear(); SetTmpSize(0); }
// Return the size of Tmp variable
unsigned GetTmpSize() { return TmpSize; }
void SetTmpSize(unsigned Size) { TmpSize = Size; }
private:
// If the Node is a BUILD_PAIR representing a direct Address,
// then this function will return true.
bool isDirectAddress(const SDValue &Op);
// If the Node is a DirectAddress in ROM_SPACE then this
// function will return true
bool isRomAddress(const SDValue &Op);
// Extract the Lo and Hi component of Op.
void GetExpandedParts(SDValue Op, SelectionDAG &DAG, SDValue &Lo,
SDValue &Hi);
// Load pointer can be a direct or indirect address. In PIC16 direct
// addresses need Banksel and Indirect addresses need to be loaded to
// FSR first. Handle address specific cases here.
void LegalizeAddress(SDValue Ptr, SelectionDAG &DAG, SDValue &Chain,
SDValue &NewPtr, unsigned &Offset, DebugLoc dl);
// FrameIndex should be broken down into ExternalSymbol and FrameOffset.
void LegalizeFrameIndex(SDValue Op, SelectionDAG &DAG, SDValue &ES,
int &Offset);
// We can not have both operands of a binary operation in W.
// This function is used to put one operand on stack and generate a load.
SDValue ConvertToMemOperand(SDValue Op, SelectionDAG &DAG, DebugLoc dl);
// This function checks if we need to put an operand of an operation on
// stack and generate a load or not.
bool NeedToConvertToMemOp(SDValue Op, unsigned &MemOp);
/// Subtarget - Keep a pointer to the PIC16Subtarget around so that we can
/// make the right decision when generating code for different targets.
const PIC16Subtarget *Subtarget;
// Extending the LIB Call framework of LLVM
// to hold the names of PIC16Libcalls.
const char *PIC16LibcallNames[PIC16ISD::PIC16UnknownCall];
// To set and retrieve the lib call names.
void setPIC16LibcallName(PIC16ISD::PIC16Libcall Call, const char *Name);
const char *getPIC16LibcallName(PIC16ISD::PIC16Libcall Call);
// Make PIC16 Libcall.
SDValue MakePIC16Libcall(PIC16ISD::PIC16Libcall Call, MVT RetVT,
const SDValue *Ops, unsigned NumOps, bool isSigned,
SelectionDAG &DAG, DebugLoc dl);
// Check if operation has a direct load operand.
inline bool isDirectLoad(const SDValue Op);
private:
// The frameindexes generated for spill/reload are stack based.
// This maps maintain zero based indexes for these FIs.
std::map<unsigned, unsigned> FiTmpOffsetMap;
unsigned TmpSize;
};
} // namespace llvm
#endif // PIC16ISELLOWERING_H
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