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264 lines
11 KiB
C++
264 lines
11 KiB
C++
//===-- PIC16ISelLowering.h - PIC16 DAG Lowering Interface ------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the interfaces that PIC16 uses to lower LLVM code into a
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// selection DAG.
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//
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//===----------------------------------------------------------------------===//
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#ifndef PIC16ISELLOWERING_H
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#define PIC16ISELLOWERING_H
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#include "PIC16.h"
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#include "PIC16Subtarget.h"
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#include "llvm/CodeGen/SelectionDAG.h"
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#include "llvm/CodeGen/SelectionDAGISel.h"
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#include "llvm/Target/TargetLowering.h"
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#include <map>
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namespace llvm {
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namespace PIC16ISD {
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enum NodeType {
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// Start the numbering from where ISD NodeType finishes.
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FIRST_NUMBER = ISD::BUILTIN_OP_END,
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Lo, // Low 8-bits of GlobalAddress.
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Hi, // High 8-bits of GlobalAddress.
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PIC16Load,
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PIC16LdArg, // This is replica of PIC16Load but used to load function
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// arguments and is being used for facilitating for some
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// store removal optimizations.
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PIC16LdWF,
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PIC16Store,
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PIC16StWF,
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Banksel,
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MTLO, // Move to low part of FSR
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MTHI, // Move to high part of FSR
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MTPCLATH, // Move to PCLATCH
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PIC16Connect, // General connector for PIC16 nodes
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BCF,
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LSLF, // PIC16 Logical shift left
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LRLF, // PIC16 Logical shift right
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RLF, // Rotate left through carry
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RRF, // Rotate right through carry
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CALL, // PIC16 Call instruction
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CALLW, // PIC16 CALLW instruction
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SUBCC, // Compare for equality or inequality.
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SELECT_ICC, // Psuedo to be caught in schedular and expanded to brcond.
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BRCOND, // Conditional branch.
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RET, // Return.
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Dummy
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};
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// Keep track of different address spaces.
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enum AddressSpace {
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RAM_SPACE = 0, // RAM address space
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ROM_SPACE = 1 // ROM address space number is 1
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};
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enum PIC16Libcall {
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MUL_I8 = RTLIB::UNKNOWN_LIBCALL + 1,
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SRA_I8,
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SLL_I8,
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SRL_I8,
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PIC16UnknownCall
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};
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}
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//===--------------------------------------------------------------------===//
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// TargetLowering Implementation
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//===--------------------------------------------------------------------===//
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class PIC16TargetLowering : public TargetLowering {
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public:
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explicit PIC16TargetLowering(PIC16TargetMachine &TM);
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/// getTargetNodeName - This method returns the name of a target specific
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/// DAG node.
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virtual const char *getTargetNodeName(unsigned Opcode) const;
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/// getSetCCResultType - Return the ISD::SETCC ValueType
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virtual MVT::SimpleValueType getSetCCResultType(EVT ValType) const;
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SDValue LowerShift(SDValue Op, SelectionDAG &DAG);
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SDValue LowerMUL(SDValue Op, SelectionDAG &DAG);
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SDValue LowerADD(SDValue Op, SelectionDAG &DAG);
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SDValue LowerSUB(SDValue Op, SelectionDAG &DAG);
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SDValue LowerBinOp(SDValue Op, SelectionDAG &DAG);
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// Call returns
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SDValue
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LowerDirectCallReturn(SDValue RetLabel, SDValue Chain, SDValue InFlag,
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const SmallVectorImpl<ISD::InputArg> &Ins,
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DebugLoc dl, SelectionDAG &DAG,
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SmallVectorImpl<SDValue> &InVals);
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SDValue
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LowerIndirectCallReturn(SDValue Chain, SDValue InFlag,
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SDValue DataAddr_Lo, SDValue DataAddr_Hi,
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const SmallVectorImpl<ISD::InputArg> &Ins,
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DebugLoc dl, SelectionDAG &DAG,
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SmallVectorImpl<SDValue> &InVals);
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// Call arguments
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SDValue
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LowerDirectCallArguments(SDValue ArgLabel, SDValue Chain, SDValue InFlag,
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const SmallVectorImpl<ISD::OutputArg> &Outs,
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DebugLoc dl, SelectionDAG &DAG);
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SDValue
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LowerIndirectCallArguments(SDValue Chain, SDValue InFlag,
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SDValue DataAddr_Lo, SDValue DataAddr_Hi,
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const SmallVectorImpl<ISD::OutputArg> &Outs,
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const SmallVectorImpl<ISD::InputArg> &Ins,
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DebugLoc dl, SelectionDAG &DAG);
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SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG);
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SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG);
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SDValue getPIC16Cmp(SDValue LHS, SDValue RHS, unsigned OrigCC, SDValue &CC,
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SelectionDAG &DAG, DebugLoc dl);
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virtual MachineBasicBlock *EmitInstrWithCustomInserter(MachineInstr *MI,
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MachineBasicBlock *MBB,
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DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM) const;
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virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG);
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virtual void ReplaceNodeResults(SDNode *N,
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SmallVectorImpl<SDValue> &Results,
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SelectionDAG &DAG);
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virtual void LowerOperationWrapper(SDNode *N,
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SmallVectorImpl<SDValue> &Results,
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SelectionDAG &DAG);
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virtual SDValue
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LowerFormalArguments(SDValue Chain,
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CallingConv::ID CallConv,
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bool isVarArg,
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const SmallVectorImpl<ISD::InputArg> &Ins,
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DebugLoc dl, SelectionDAG &DAG,
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SmallVectorImpl<SDValue> &InVals);
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virtual SDValue
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LowerCall(SDValue Chain, SDValue Callee,
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CallingConv::ID CallConv, bool isVarArg, bool isTailCall,
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const SmallVectorImpl<ISD::OutputArg> &Outs,
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const SmallVectorImpl<ISD::InputArg> &Ins,
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DebugLoc dl, SelectionDAG &DAG,
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SmallVectorImpl<SDValue> &InVals);
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virtual SDValue
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LowerReturn(SDValue Chain,
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CallingConv::ID CallConv, bool isVarArg,
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const SmallVectorImpl<ISD::OutputArg> &Outs,
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DebugLoc dl, SelectionDAG &DAG);
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SDValue ExpandStore(SDNode *N, SelectionDAG &DAG);
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SDValue ExpandLoad(SDNode *N, SelectionDAG &DAG);
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SDValue ExpandGlobalAddress(SDNode *N, SelectionDAG &DAG);
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SDValue ExpandExternalSymbol(SDNode *N, SelectionDAG &DAG);
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SDValue ExpandFrameIndex(SDNode *N, SelectionDAG &DAG);
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SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const;
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SDValue PerformPIC16LoadCombine(SDNode *N, DAGCombinerInfo &DCI) const;
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SDValue PerformStoreCombine(SDNode *N, DAGCombinerInfo &DCI) const;
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// This function returns the Tmp Offset for FrameIndex. If any TmpOffset
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// already exists for the FI then it returns the same else it creates the
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// new offset and returns.
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unsigned GetTmpOffsetForFI(unsigned FI, unsigned slot_size);
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void ResetTmpOffsetMap() { FiTmpOffsetMap.clear(); SetTmpSize(0); }
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void InitReservedFrameCount(const Function *F);
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// Return the size of Tmp variable
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unsigned GetTmpSize() { return TmpSize; }
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void SetTmpSize(unsigned Size) { TmpSize = Size; }
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/// getFunctionAlignment - Return the Log2 alignment of this function.
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virtual unsigned getFunctionAlignment(const Function *) const {
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// FIXME: The function never seems to be aligned.
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return 1;
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}
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private:
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// If the Node is a BUILD_PAIR representing a direct Address,
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// then this function will return true.
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bool isDirectAddress(const SDValue &Op);
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// If the Node is a DirectAddress in ROM_SPACE then this
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// function will return true
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bool isRomAddress(const SDValue &Op);
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// Extract the Lo and Hi component of Op.
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void GetExpandedParts(SDValue Op, SelectionDAG &DAG, SDValue &Lo,
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SDValue &Hi);
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// Load pointer can be a direct or indirect address. In PIC16 direct
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// addresses need Banksel and Indirect addresses need to be loaded to
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// FSR first. Handle address specific cases here.
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void LegalizeAddress(SDValue Ptr, SelectionDAG &DAG, SDValue &Chain,
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SDValue &NewPtr, unsigned &Offset, DebugLoc dl);
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// FrameIndex should be broken down into ExternalSymbol and FrameOffset.
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void LegalizeFrameIndex(SDValue Op, SelectionDAG &DAG, SDValue &ES,
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int &Offset);
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// For indirect calls data address of the callee frame need to be
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// extracted. This function fills the arguments DataAddr_Lo and
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// DataAddr_Hi with the address of the callee frame.
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void GetDataAddress(DebugLoc dl, SDValue Callee, SDValue &Chain,
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SDValue &DataAddr_Lo, SDValue &DataAddr_Hi,
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SelectionDAG &DAG);
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// We can not have both operands of a binary operation in W.
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// This function is used to put one operand on stack and generate a load.
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SDValue ConvertToMemOperand(SDValue Op, SelectionDAG &DAG, DebugLoc dl);
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// This function checks if we need to put an operand of an operation on
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// stack and generate a load or not.
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// DAG parameter is required to access DAG information during
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// analysis.
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bool NeedToConvertToMemOp(SDValue Op, unsigned &MemOp, SelectionDAG &DAG);
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/// Subtarget - Keep a pointer to the PIC16Subtarget around so that we can
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/// make the right decision when generating code for different targets.
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const PIC16Subtarget *Subtarget;
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// Extending the LIB Call framework of LLVM
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// to hold the names of PIC16Libcalls.
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const char *PIC16LibcallNames[PIC16ISD::PIC16UnknownCall];
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// To set and retrieve the lib call names.
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void setPIC16LibcallName(PIC16ISD::PIC16Libcall Call, const char *Name);
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const char *getPIC16LibcallName(PIC16ISD::PIC16Libcall Call);
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// Make PIC16 Libcall.
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SDValue MakePIC16Libcall(PIC16ISD::PIC16Libcall Call, EVT RetVT,
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const SDValue *Ops, unsigned NumOps, bool isSigned,
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SelectionDAG &DAG, DebugLoc dl);
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// Check if operation has a direct load operand.
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inline bool isDirectLoad(const SDValue Op);
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public:
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// Keep a pointer to SelectionDAGISel to access its public
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// interface (It is required during legalization)
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SelectionDAGISel *ISel;
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private:
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// The frameindexes generated for spill/reload are stack based.
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// This maps maintain zero based indexes for these FIs.
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std::map<unsigned, unsigned> FiTmpOffsetMap;
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unsigned TmpSize;
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// These are the frames for return value and argument passing
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// These FrameIndices will be expanded to foo.frame external symbol
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// and all others will be expanded to foo.tmp external symbol.
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unsigned ReservedFrameCount;
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};
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} // namespace llvm
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#endif // PIC16ISELLOWERING_H
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