//===-- PPCISelDAGToDAG.cpp - PPC --pattern matching inst selector --------===// // // The LLVM Compiler Infrastructure // // This file was developed by Chris Lattner and is distributed under // the University of Illinois Open Source License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This file defines a pattern matching instruction selector for PowerPC, // converting from a legalized dag to a PPC dag. // //===----------------------------------------------------------------------===// #include "PPC.h" #include "PPCTargetMachine.h" #include "PPCISelLowering.h" #include "PPCHazardRecognizers.h" #include "llvm/CodeGen/MachineInstrBuilder.h" #include "llvm/CodeGen/MachineFunction.h" #include "llvm/CodeGen/SSARegMap.h" #include "llvm/CodeGen/SelectionDAG.h" #include "llvm/CodeGen/SelectionDAGISel.h" #include "llvm/Target/TargetOptions.h" #include "llvm/ADT/Statistic.h" #include "llvm/Constants.h" #include "llvm/GlobalValue.h" #include "llvm/Intrinsics.h" #include "llvm/Support/Debug.h" #include "llvm/Support/MathExtras.h" #include "llvm/Support/Compiler.h" #include #include #include using namespace llvm; namespace { Statistic<> FrameOff("ppc-codegen", "Number of frame idx offsets collapsed"); //===--------------------------------------------------------------------===// /// PPCDAGToDAGISel - PPC specific code to select PPC machine /// instructions for SelectionDAG operations. /// class VISIBILITY_HIDDEN PPCDAGToDAGISel : public SelectionDAGISel { PPCTargetMachine &TM; PPCTargetLowering PPCLowering; unsigned GlobalBaseReg; public: PPCDAGToDAGISel(PPCTargetMachine &tm) : SelectionDAGISel(PPCLowering), TM(tm), PPCLowering(*TM.getTargetLowering()) {} virtual bool runOnFunction(Function &Fn) { // Make sure we re-emit a set of the global base reg if necessary GlobalBaseReg = 0; SelectionDAGISel::runOnFunction(Fn); InsertVRSaveCode(Fn); return true; } /// getI32Imm - Return a target constant with the specified value, of type /// i32. inline SDOperand getI32Imm(unsigned Imm) { return CurDAG->getTargetConstant(Imm, MVT::i32); } /// getI64Imm - Return a target constant with the specified value, of type /// i64. inline SDOperand getI64Imm(uint64_t Imm) { return CurDAG->getTargetConstant(Imm, MVT::i64); } /// getSmallIPtrImm - Return a target constant of pointer type. inline SDOperand getSmallIPtrImm(unsigned Imm) { return CurDAG->getTargetConstant(Imm, PPCLowering.getPointerTy()); } /// isRunOfOnes - Returns true iff Val consists of one contiguous run of 1s /// with any number of 0s on either side. The 1s are allowed to wrap from /// LSB to MSB, so 0x000FFF0, 0x0000FFFF, and 0xFF0000FF are all runs. /// 0x0F0F0000 is not, since all 1s are not contiguous. static bool isRunOfOnes(unsigned Val, unsigned &MB, unsigned &ME); /// isRotateAndMask - Returns true if Mask and Shift can be folded into a /// rotate and mask opcode and mask operation. static bool isRotateAndMask(SDNode *N, unsigned Mask, bool IsShiftMask, unsigned &SH, unsigned &MB, unsigned &ME); /// getGlobalBaseReg - insert code into the entry mbb to materialize the PIC /// base register. Return the virtual register that holds this value. SDNode *getGlobalBaseReg(); // Select - Convert the specified operand from a target-independent to a // target-specific node if it hasn't already been changed. SDNode *Select(SDOperand Op); SDNode *SelectBitfieldInsert(SDNode *N); /// SelectCC - Select a comparison of the specified values with the /// specified condition code, returning the CR# of the expression. SDOperand SelectCC(SDOperand LHS, SDOperand RHS, ISD::CondCode CC); /// SelectAddrImm - Returns true if the address N can be represented by /// a base register plus a signed 16-bit displacement [r+imm]. bool SelectAddrImm(SDOperand Op, SDOperand N, SDOperand &Disp, SDOperand &Base) { return PPCLowering.SelectAddressRegImm(N, Disp, Base, *CurDAG); } /// SelectAddrIdx - Given the specified addressed, check to see if it can be /// represented as an indexed [r+r] operation. Returns false if it can /// be represented by [r+imm], which are preferred. bool SelectAddrIdx(SDOperand Op, SDOperand N, SDOperand &Base, SDOperand &Index) { return PPCLowering.SelectAddressRegReg(N, Base, Index, *CurDAG); } /// SelectAddrIdxOnly - Given the specified addressed, force it to be /// represented as an indexed [r+r] operation. bool SelectAddrIdxOnly(SDOperand Op, SDOperand N, SDOperand &Base, SDOperand &Index) { return PPCLowering.SelectAddressRegRegOnly(N, Base, Index, *CurDAG); } /// SelectAddrImmShift - Returns true if the address N can be represented by /// a base register plus a signed 14-bit displacement [r+imm*4]. Suitable /// for use by STD and friends. bool SelectAddrImmShift(SDOperand Op, SDOperand N, SDOperand &Disp, SDOperand &Base) { return PPCLowering.SelectAddressRegImmShift(N, Disp, Base, *CurDAG); } /// SelectInlineAsmMemoryOperand - Implement addressing mode selection for /// inline asm expressions. virtual bool SelectInlineAsmMemoryOperand(const SDOperand &Op, char ConstraintCode, std::vector &OutOps, SelectionDAG &DAG) { SDOperand Op0, Op1; switch (ConstraintCode) { default: return true; case 'm': // memory if (!SelectAddrIdx(Op, Op, Op0, Op1)) SelectAddrImm(Op, Op, Op0, Op1); break; case 'o': // offsetable if (!SelectAddrImm(Op, Op, Op0, Op1)) { Op0 = Op; AddToISelQueue(Op0); // r+0. Op1 = getSmallIPtrImm(0); } break; case 'v': // not offsetable SelectAddrIdxOnly(Op, Op, Op0, Op1); break; } OutOps.push_back(Op0); OutOps.push_back(Op1); return false; } SDOperand BuildSDIVSequence(SDNode *N); SDOperand BuildUDIVSequence(SDNode *N); /// InstructionSelectBasicBlock - This callback is invoked by /// SelectionDAGISel when it has created a SelectionDAG for us to codegen. virtual void InstructionSelectBasicBlock(SelectionDAG &DAG); void InsertVRSaveCode(Function &Fn); virtual const char *getPassName() const { return "PowerPC DAG->DAG Pattern Instruction Selection"; } /// CreateTargetHazardRecognizer - Return the hazard recognizer to use for /// this target when scheduling the DAG. virtual HazardRecognizer *CreateTargetHazardRecognizer() { // Should use subtarget info to pick the right hazard recognizer. For // now, always return a PPC970 recognizer. const TargetInstrInfo *II = PPCLowering.getTargetMachine().getInstrInfo(); assert(II && "No InstrInfo?"); return new PPCHazardRecognizer970(*II); } // Include the pieces autogenerated from the target description. #include "PPCGenDAGISel.inc" private: SDNode *SelectSETCC(SDOperand Op); SDNode *MySelect_PPCbctrl(SDOperand N); SDNode *MySelect_PPCcall(SDOperand N); }; } /// InstructionSelectBasicBlock - This callback is invoked by /// SelectionDAGISel when it has created a SelectionDAG for us to codegen. void PPCDAGToDAGISel::InstructionSelectBasicBlock(SelectionDAG &DAG) { DEBUG(BB->dump()); // Select target instructions for the DAG. DAG.setRoot(SelectRoot(DAG.getRoot())); DAG.RemoveDeadNodes(); // Emit machine code to BB. ScheduleAndEmitDAG(DAG); } /// InsertVRSaveCode - Once the entire function has been instruction selected, /// all virtual registers are created and all machine instructions are built, /// check to see if we need to save/restore VRSAVE. If so, do it. void PPCDAGToDAGISel::InsertVRSaveCode(Function &F) { // Check to see if this function uses vector registers, which means we have to // save and restore the VRSAVE register and update it with the regs we use. // // In this case, there will be virtual registers of vector type type created // by the scheduler. Detect them now. MachineFunction &Fn = MachineFunction::get(&F); SSARegMap *RegMap = Fn.getSSARegMap(); bool HasVectorVReg = false; for (unsigned i = MRegisterInfo::FirstVirtualRegister, e = RegMap->getLastVirtReg()+1; i != e; ++i) if (RegMap->getRegClass(i) == &PPC::VRRCRegClass) { HasVectorVReg = true; break; } if (!HasVectorVReg) return; // nothing to do. // If we have a vector register, we want to emit code into the entry and exit // blocks to save and restore the VRSAVE register. We do this here (instead // of marking all vector instructions as clobbering VRSAVE) for two reasons: // // 1. This (trivially) reduces the load on the register allocator, by not // having to represent the live range of the VRSAVE register. // 2. This (more significantly) allows us to create a temporary virtual // register to hold the saved VRSAVE value, allowing this temporary to be // register allocated, instead of forcing it to be spilled to the stack. // Create two vregs - one to hold the VRSAVE register that is live-in to the // function and one for the value after having bits or'd into it. unsigned InVRSAVE = RegMap->createVirtualRegister(&PPC::GPRCRegClass); unsigned UpdatedVRSAVE = RegMap->createVirtualRegister(&PPC::GPRCRegClass); MachineBasicBlock &EntryBB = *Fn.begin(); // Emit the following code into the entry block: // InVRSAVE = MFVRSAVE // UpdatedVRSAVE = UPDATE_VRSAVE InVRSAVE // MTVRSAVE UpdatedVRSAVE MachineBasicBlock::iterator IP = EntryBB.begin(); // Insert Point BuildMI(EntryBB, IP, PPC::MFVRSAVE, 0, InVRSAVE); BuildMI(EntryBB, IP, PPC::UPDATE_VRSAVE, 1, UpdatedVRSAVE).addReg(InVRSAVE); BuildMI(EntryBB, IP, PPC::MTVRSAVE, 1).addReg(UpdatedVRSAVE); // Find all return blocks, outputting a restore in each epilog. const TargetInstrInfo &TII = *TM.getInstrInfo(); for (MachineFunction::iterator BB = Fn.begin(), E = Fn.end(); BB != E; ++BB) { if (!BB->empty() && TII.isReturn(BB->back().getOpcode())) { IP = BB->end(); --IP; // Skip over all terminator instructions, which are part of the return // sequence. MachineBasicBlock::iterator I2 = IP; while (I2 != BB->begin() && TII.isTerminatorInstr((--I2)->getOpcode())) IP = I2; // Emit: MTVRSAVE InVRSave BuildMI(*BB, IP, PPC::MTVRSAVE, 1).addReg(InVRSAVE); } } } /// getGlobalBaseReg - Output the instructions required to put the /// base address to use for accessing globals into a register. /// SDNode *PPCDAGToDAGISel::getGlobalBaseReg() { if (!GlobalBaseReg) { // Insert the set of GlobalBaseReg into the first MBB of the function MachineBasicBlock &FirstMBB = BB->getParent()->front(); MachineBasicBlock::iterator MBBI = FirstMBB.begin(); SSARegMap *RegMap = BB->getParent()->getSSARegMap(); if (PPCLowering.getPointerTy() == MVT::i32) GlobalBaseReg = RegMap->createVirtualRegister(PPC::GPRCRegisterClass); else GlobalBaseReg = RegMap->createVirtualRegister(PPC::G8RCRegisterClass); BuildMI(FirstMBB, MBBI, PPC::MovePCtoLR, 0, PPC::LR); BuildMI(FirstMBB, MBBI, PPC::MFLR, 1, GlobalBaseReg); } return CurDAG->getRegister(GlobalBaseReg, PPCLowering.getPointerTy()).Val; } /// isIntS16Immediate - This method tests to see if the node is either a 32-bit /// or 64-bit immediate, and if the value can be accurately represented as a /// sign extension from a 16-bit value. If so, this returns true and the /// immediate. static bool isIntS16Immediate(SDNode *N, short &Imm) { if (N->getOpcode() != ISD::Constant) return false; Imm = (short)cast(N)->getValue(); if (N->getValueType(0) == MVT::i32) return Imm == (int32_t)cast(N)->getValue(); else return Imm == (int64_t)cast(N)->getValue(); } static bool isIntS16Immediate(SDOperand Op, short &Imm) { return isIntS16Immediate(Op.Val, Imm); } /// isInt32Immediate - This method tests to see if the node is a 32-bit constant /// operand. If so Imm will receive the 32-bit value. static bool isInt32Immediate(SDNode *N, unsigned &Imm) { if (N->getOpcode() == ISD::Constant && N->getValueType(0) == MVT::i32) { Imm = cast(N)->getValue(); return true; } return false; } /// isInt64Immediate - This method tests to see if the node is a 64-bit constant /// operand. If so Imm will receive the 64-bit value. static bool isInt64Immediate(SDNode *N, uint64_t &Imm) { if (N->getOpcode() == ISD::Constant && N->getValueType(0) == MVT::i64) { Imm = cast(N)->getValue(); return true; } return false; } // isInt32Immediate - This method tests to see if a constant operand. // If so Imm will receive the 32 bit value. static bool isInt32Immediate(SDOperand N, unsigned &Imm) { return isInt32Immediate(N.Val, Imm); } // isOpcWithIntImmediate - This method tests to see if the node is a specific // opcode and that it has a immediate integer right operand. // If so Imm will receive the 32 bit value. static bool isOpcWithIntImmediate(SDNode *N, unsigned Opc, unsigned& Imm) { return N->getOpcode() == Opc && isInt32Immediate(N->getOperand(1).Val, Imm); } bool PPCDAGToDAGISel::isRunOfOnes(unsigned Val, unsigned &MB, unsigned &ME) { if (isShiftedMask_32(Val)) { // look for the first non-zero bit MB = CountLeadingZeros_32(Val); // look for the first zero bit after the run of ones ME = CountLeadingZeros_32((Val - 1) ^ Val); return true; } else { Val = ~Val; // invert mask if (isShiftedMask_32(Val)) { // effectively look for the first zero bit ME = CountLeadingZeros_32(Val) - 1; // effectively look for the first one bit after the run of zeros MB = CountLeadingZeros_32((Val - 1) ^ Val) + 1; return true; } } // no run present return false; } bool PPCDAGToDAGISel::isRotateAndMask(SDNode *N, unsigned Mask, bool IsShiftMask, unsigned &SH, unsigned &MB, unsigned &ME) { // Don't even go down this path for i64, since different logic will be // necessary for rldicl/rldicr/rldimi. if (N->getValueType(0) != MVT::i32) return false; unsigned Shift = 32; unsigned Indeterminant = ~0; // bit mask marking indeterminant results unsigned Opcode = N->getOpcode(); if (N->getNumOperands() != 2 || !isInt32Immediate(N->getOperand(1).Val, Shift) || (Shift > 31)) return false; if (Opcode == ISD::SHL) { // apply shift left to mask if it comes first if (IsShiftMask) Mask = Mask << Shift; // determine which bits are made indeterminant by shift Indeterminant = ~(0xFFFFFFFFu << Shift); } else if (Opcode == ISD::SRL) { // apply shift right to mask if it comes first if (IsShiftMask) Mask = Mask >> Shift; // determine which bits are made indeterminant by shift Indeterminant = ~(0xFFFFFFFFu >> Shift); // adjust for the left rotate Shift = 32 - Shift; } else if (Opcode == ISD::ROTL) { Indeterminant = 0; } else { return false; } // if the mask doesn't intersect any Indeterminant bits if (Mask && !(Mask & Indeterminant)) { SH = Shift & 31; // make sure the mask is still a mask (wrap arounds may not be) return isRunOfOnes(Mask, MB, ME); } return false; } /// SelectBitfieldInsert - turn an or of two masked values into /// the rotate left word immediate then mask insert (rlwimi) instruction. SDNode *PPCDAGToDAGISel::SelectBitfieldInsert(SDNode *N) { SDOperand Op0 = N->getOperand(0); SDOperand Op1 = N->getOperand(1); uint64_t LKZ, LKO, RKZ, RKO; TLI.ComputeMaskedBits(Op0, 0xFFFFFFFFULL, LKZ, LKO); TLI.ComputeMaskedBits(Op1, 0xFFFFFFFFULL, RKZ, RKO); unsigned TargetMask = LKZ; unsigned InsertMask = RKZ; if ((TargetMask | InsertMask) == 0xFFFFFFFF) { unsigned Op0Opc = Op0.getOpcode(); unsigned Op1Opc = Op1.getOpcode(); unsigned Value, SH = 0; TargetMask = ~TargetMask; InsertMask = ~InsertMask; // If the LHS has a foldable shift and the RHS does not, then swap it to the // RHS so that we can fold the shift into the insert. if (Op0Opc == ISD::AND && Op1Opc == ISD::AND) { if (Op0.getOperand(0).getOpcode() == ISD::SHL || Op0.getOperand(0).getOpcode() == ISD::SRL) { if (Op1.getOperand(0).getOpcode() != ISD::SHL && Op1.getOperand(0).getOpcode() != ISD::SRL) { std::swap(Op0, Op1); std::swap(Op0Opc, Op1Opc); std::swap(TargetMask, InsertMask); } } } else if (Op0Opc == ISD::SHL || Op0Opc == ISD::SRL) { if (Op1Opc == ISD::AND && Op1.getOperand(0).getOpcode() != ISD::SHL && Op1.getOperand(0).getOpcode() != ISD::SRL) { std::swap(Op0, Op1); std::swap(Op0Opc, Op1Opc); std::swap(TargetMask, InsertMask); } } unsigned MB, ME; if (InsertMask && isRunOfOnes(InsertMask, MB, ME)) { SDOperand Tmp1, Tmp2, Tmp3; bool DisjointMask = (TargetMask ^ InsertMask) == 0xFFFFFFFF; if ((Op1Opc == ISD::SHL || Op1Opc == ISD::SRL) && isInt32Immediate(Op1.getOperand(1), Value)) { Op1 = Op1.getOperand(0); SH = (Op1Opc == ISD::SHL) ? Value : 32 - Value; } if (Op1Opc == ISD::AND) { unsigned SHOpc = Op1.getOperand(0).getOpcode(); if ((SHOpc == ISD::SHL || SHOpc == ISD::SRL) && isInt32Immediate(Op1.getOperand(0).getOperand(1), Value)) { Op1 = Op1.getOperand(0).getOperand(0); SH = (SHOpc == ISD::SHL) ? Value : 32 - Value; } else { Op1 = Op1.getOperand(0); } } Tmp3 = (Op0Opc == ISD::AND && DisjointMask) ? Op0.getOperand(0) : Op0; AddToISelQueue(Tmp3); AddToISelQueue(Op1); SH &= 31; SDOperand Ops[] = { Tmp3, Op1, getI32Imm(SH), getI32Imm(MB), getI32Imm(ME) }; return CurDAG->getTargetNode(PPC::RLWIMI, MVT::i32, Ops, 5); } } return 0; } /// SelectCC - Select a comparison of the specified values with the specified /// condition code, returning the CR# of the expression. SDOperand PPCDAGToDAGISel::SelectCC(SDOperand LHS, SDOperand RHS, ISD::CondCode CC) { // Always select the LHS. AddToISelQueue(LHS); unsigned Opc; if (LHS.getValueType() == MVT::i32) { unsigned Imm; if (CC == ISD::SETEQ || CC == ISD::SETNE) { if (isInt32Immediate(RHS, Imm)) { // SETEQ/SETNE comparison with 16-bit immediate, fold it. if (isUInt16(Imm)) return SDOperand(CurDAG->getTargetNode(PPC::CMPLWI, MVT::i32, LHS, getI32Imm(Imm & 0xFFFF)), 0); // If this is a 16-bit signed immediate, fold it. if (isInt16(Imm)) return SDOperand(CurDAG->getTargetNode(PPC::CMPWI, MVT::i32, LHS, getI32Imm(Imm & 0xFFFF)), 0); // For non-equality comparisons, the default code would materialize the // constant, then compare against it, like this: // lis r2, 4660 // ori r2, r2, 22136 // cmpw cr0, r3, r2 // Since we are just comparing for equality, we can emit this instead: // xoris r0,r3,0x1234 // cmplwi cr0,r0,0x5678 // beq cr0,L6 SDOperand Xor(CurDAG->getTargetNode(PPC::XORIS, MVT::i32, LHS, getI32Imm(Imm >> 16)), 0); return SDOperand(CurDAG->getTargetNode(PPC::CMPLWI, MVT::i32, Xor, getI32Imm(Imm & 0xFFFF)), 0); } Opc = PPC::CMPLW; } else if (ISD::isUnsignedIntSetCC(CC)) { if (isInt32Immediate(RHS, Imm) && isUInt16(Imm)) return SDOperand(CurDAG->getTargetNode(PPC::CMPLWI, MVT::i32, LHS, getI32Imm(Imm & 0xFFFF)), 0); Opc = PPC::CMPLW; } else { short SImm; if (isIntS16Immediate(RHS, SImm)) return SDOperand(CurDAG->getTargetNode(PPC::CMPWI, MVT::i32, LHS, getI32Imm((int)SImm & 0xFFFF)), 0); Opc = PPC::CMPW; } } else if (LHS.getValueType() == MVT::i64) { uint64_t Imm; if (CC == ISD::SETEQ || CC == ISD::SETNE) { if (isInt64Immediate(RHS.Val, Imm)) { // SETEQ/SETNE comparison with 16-bit immediate, fold it. if (isUInt16(Imm)) return SDOperand(CurDAG->getTargetNode(PPC::CMPLDI, MVT::i64, LHS, getI32Imm(Imm & 0xFFFF)), 0); // If this is a 16-bit signed immediate, fold it. if (isInt16(Imm)) return SDOperand(CurDAG->getTargetNode(PPC::CMPDI, MVT::i64, LHS, getI32Imm(Imm & 0xFFFF)), 0); // For non-equality comparisons, the default code would materialize the // constant, then compare against it, like this: // lis r2, 4660 // ori r2, r2, 22136 // cmpd cr0, r3, r2 // Since we are just comparing for equality, we can emit this instead: // xoris r0,r3,0x1234 // cmpldi cr0,r0,0x5678 // beq cr0,L6 if (isUInt32(Imm)) { SDOperand Xor(CurDAG->getTargetNode(PPC::XORIS8, MVT::i64, LHS, getI64Imm(Imm >> 16)), 0); return SDOperand(CurDAG->getTargetNode(PPC::CMPLDI, MVT::i64, Xor, getI64Imm(Imm & 0xFFFF)), 0); } } Opc = PPC::CMPLD; } else if (ISD::isUnsignedIntSetCC(CC)) { if (isInt64Immediate(RHS.Val, Imm) && isUInt16(Imm)) return SDOperand(CurDAG->getTargetNode(PPC::CMPLDI, MVT::i64, LHS, getI64Imm(Imm & 0xFFFF)), 0); Opc = PPC::CMPLD; } else { short SImm; if (isIntS16Immediate(RHS, SImm)) return SDOperand(CurDAG->getTargetNode(PPC::CMPDI, MVT::i64, LHS, getI64Imm(SImm & 0xFFFF)), 0); Opc = PPC::CMPD; } } else if (LHS.getValueType() == MVT::f32) { Opc = PPC::FCMPUS; } else { assert(LHS.getValueType() == MVT::f64 && "Unknown vt!"); Opc = PPC::FCMPUD; } AddToISelQueue(RHS); return SDOperand(CurDAG->getTargetNode(Opc, MVT::i32, LHS, RHS), 0); } /// getBCCForSetCC - Returns the PowerPC condition branch mnemonic corresponding /// to Condition. static unsigned getBCCForSetCC(ISD::CondCode CC) { switch (CC) { default: assert(0 && "Unknown condition!"); abort(); case ISD::SETOEQ: // FIXME: This is incorrect see PR642. case ISD::SETUEQ: case ISD::SETEQ: return PPC::BEQ; case ISD::SETONE: // FIXME: This is incorrect see PR642. case ISD::SETUNE: case ISD::SETNE: return PPC::BNE; case ISD::SETOLT: // FIXME: This is incorrect see PR642. case ISD::SETULT: case ISD::SETLT: return PPC::BLT; case ISD::SETOLE: // FIXME: This is incorrect see PR642. case ISD::SETULE: case ISD::SETLE: return PPC::BLE; case ISD::SETOGT: // FIXME: This is incorrect see PR642. case ISD::SETUGT: case ISD::SETGT: return PPC::BGT; case ISD::SETOGE: // FIXME: This is incorrect see PR642. case ISD::SETUGE: case ISD::SETGE: return PPC::BGE; case ISD::SETO: return PPC::BNU; case ISD::SETUO: return PPC::BUN; } return 0; } /// getCRIdxForSetCC - Return the index of the condition register field /// associated with the SetCC condition, and whether or not the field is /// treated as inverted. That is, lt = 0; ge = 0 inverted. static unsigned getCRIdxForSetCC(ISD::CondCode CC, bool& Inv) { switch (CC) { default: assert(0 && "Unknown condition!"); abort(); case ISD::SETOLT: // FIXME: This is incorrect see PR642. case ISD::SETULT: case ISD::SETLT: Inv = false; return 0; case ISD::SETOGE: // FIXME: This is incorrect see PR642. case ISD::SETUGE: case ISD::SETGE: Inv = true; return 0; case ISD::SETOGT: // FIXME: This is incorrect see PR642. case ISD::SETUGT: case ISD::SETGT: Inv = false; return 1; case ISD::SETOLE: // FIXME: This is incorrect see PR642. case ISD::SETULE: case ISD::SETLE: Inv = true; return 1; case ISD::SETOEQ: // FIXME: This is incorrect see PR642. case ISD::SETUEQ: case ISD::SETEQ: Inv = false; return 2; case ISD::SETONE: // FIXME: This is incorrect see PR642. case ISD::SETUNE: case ISD::SETNE: Inv = true; return 2; case ISD::SETO: Inv = true; return 3; case ISD::SETUO: Inv = false; return 3; } return 0; } SDNode *PPCDAGToDAGISel::SelectSETCC(SDOperand Op) { SDNode *N = Op.Val; unsigned Imm; ISD::CondCode CC = cast(N->getOperand(2))->get(); if (isInt32Immediate(N->getOperand(1), Imm)) { // We can codegen setcc op, imm very efficiently compared to a brcond. // Check for those cases here. // setcc op, 0 if (Imm == 0) { SDOperand Op = N->getOperand(0); AddToISelQueue(Op); switch (CC) { default: break; case ISD::SETEQ: { Op = SDOperand(CurDAG->getTargetNode(PPC::CNTLZW, MVT::i32, Op), 0); SDOperand Ops[] = { Op, getI32Imm(27), getI32Imm(5), getI32Imm(31) }; return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops, 4); } case ISD::SETNE: { SDOperand AD = SDOperand(CurDAG->getTargetNode(PPC::ADDIC, MVT::i32, MVT::Flag, Op, getI32Imm(~0U)), 0); return CurDAG->SelectNodeTo(N, PPC::SUBFE, MVT::i32, AD, Op, AD.getValue(1)); } case ISD::SETLT: { SDOperand Ops[] = { Op, getI32Imm(1), getI32Imm(31), getI32Imm(31) }; return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops, 4); } case ISD::SETGT: { SDOperand T = SDOperand(CurDAG->getTargetNode(PPC::NEG, MVT::i32, Op), 0); T = SDOperand(CurDAG->getTargetNode(PPC::ANDC, MVT::i32, T, Op), 0); SDOperand Ops[] = { T, getI32Imm(1), getI32Imm(31), getI32Imm(31) }; return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops, 4); } } } else if (Imm == ~0U) { // setcc op, -1 SDOperand Op = N->getOperand(0); AddToISelQueue(Op); switch (CC) { default: break; case ISD::SETEQ: Op = SDOperand(CurDAG->getTargetNode(PPC::ADDIC, MVT::i32, MVT::Flag, Op, getI32Imm(1)), 0); return CurDAG->SelectNodeTo(N, PPC::ADDZE, MVT::i32, SDOperand(CurDAG->getTargetNode(PPC::LI, MVT::i32, getI32Imm(0)), 0), Op.getValue(1)); case ISD::SETNE: { Op = SDOperand(CurDAG->getTargetNode(PPC::NOR, MVT::i32, Op, Op), 0); SDNode *AD = CurDAG->getTargetNode(PPC::ADDIC, MVT::i32, MVT::Flag, Op, getI32Imm(~0U)); return CurDAG->SelectNodeTo(N, PPC::SUBFE, MVT::i32, SDOperand(AD, 0), Op, SDOperand(AD, 1)); } case ISD::SETLT: { SDOperand AD = SDOperand(CurDAG->getTargetNode(PPC::ADDI, MVT::i32, Op, getI32Imm(1)), 0); SDOperand AN = SDOperand(CurDAG->getTargetNode(PPC::AND, MVT::i32, AD, Op), 0); SDOperand Ops[] = { AN, getI32Imm(1), getI32Imm(31), getI32Imm(31) }; return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops, 4); } case ISD::SETGT: { SDOperand Ops[] = { Op, getI32Imm(1), getI32Imm(31), getI32Imm(31) }; Op = SDOperand(CurDAG->getTargetNode(PPC::RLWINM, MVT::i32, Ops, 4), 0); return CurDAG->SelectNodeTo(N, PPC::XORI, MVT::i32, Op, getI32Imm(1)); } } } } bool Inv; unsigned Idx = getCRIdxForSetCC(CC, Inv); SDOperand CCReg = SelectCC(N->getOperand(0), N->getOperand(1), CC); SDOperand IntCR; // Force the ccreg into CR7. SDOperand CR7Reg = CurDAG->getRegister(PPC::CR7, MVT::i32); SDOperand InFlag(0, 0); // Null incoming flag value. CCReg = CurDAG->getCopyToReg(CurDAG->getEntryNode(), CR7Reg, CCReg, InFlag).getValue(1); if (TLI.getTargetMachine().getSubtarget().isGigaProcessor()) IntCR = SDOperand(CurDAG->getTargetNode(PPC::MFOCRF, MVT::i32, CR7Reg, CCReg), 0); else IntCR = SDOperand(CurDAG->getTargetNode(PPC::MFCR, MVT::i32, CCReg), 0); SDOperand Ops[] = { IntCR, getI32Imm((32-(3-Idx)) & 31), getI32Imm(31), getI32Imm(31) }; if (!Inv) { return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops, 4); } else { SDOperand Tmp = SDOperand(CurDAG->getTargetNode(PPC::RLWINM, MVT::i32, Ops, 4), 0); return CurDAG->SelectNodeTo(N, PPC::XORI, MVT::i32, Tmp, getI32Imm(1)); } } // Select - Convert the specified operand from a target-independent to a // target-specific node if it hasn't already been changed. SDNode *PPCDAGToDAGISel::Select(SDOperand Op) { SDNode *N = Op.Val; if (N->getOpcode() >= ISD::BUILTIN_OP_END && N->getOpcode() < PPCISD::FIRST_NUMBER) return NULL; // Already selected. switch (N->getOpcode()) { default: break; case ISD::SETCC: return SelectSETCC(Op); case PPCISD::GlobalBaseReg: return getGlobalBaseReg(); case ISD::FrameIndex: { int FI = cast(N)->getIndex(); SDOperand TFI = CurDAG->getTargetFrameIndex(FI, Op.getValueType()); unsigned Opc = Op.getValueType() == MVT::i32 ? PPC::ADDI : PPC::ADDI8; if (N->hasOneUse()) return CurDAG->SelectNodeTo(N, Opc, Op.getValueType(), TFI, getSmallIPtrImm(0)); return CurDAG->getTargetNode(Opc, Op.getValueType(), TFI, getSmallIPtrImm(0)); } case PPCISD::MFCR: { SDOperand InFlag = N->getOperand(1); AddToISelQueue(InFlag); // Use MFOCRF if supported. if (TLI.getTargetMachine().getSubtarget().isGigaProcessor()) return CurDAG->getTargetNode(PPC::MFOCRF, MVT::i32, N->getOperand(0), InFlag); else return CurDAG->getTargetNode(PPC::MFCR, MVT::i32, InFlag); } case ISD::SDIV: { // FIXME: since this depends on the setting of the carry flag from the srawi // we should really be making notes about that for the scheduler. // FIXME: It sure would be nice if we could cheaply recognize the // srl/add/sra pattern the dag combiner will generate for this as // sra/addze rather than having to handle sdiv ourselves. oh well. unsigned Imm; if (isInt32Immediate(N->getOperand(1), Imm)) { SDOperand N0 = N->getOperand(0); AddToISelQueue(N0); if ((signed)Imm > 0 && isPowerOf2_32(Imm)) { SDNode *Op = CurDAG->getTargetNode(PPC::SRAWI, MVT::i32, MVT::Flag, N0, getI32Imm(Log2_32(Imm))); return CurDAG->SelectNodeTo(N, PPC::ADDZE, MVT::i32, SDOperand(Op, 0), SDOperand(Op, 1)); } else if ((signed)Imm < 0 && isPowerOf2_32(-Imm)) { SDNode *Op = CurDAG->getTargetNode(PPC::SRAWI, MVT::i32, MVT::Flag, N0, getI32Imm(Log2_32(-Imm))); SDOperand PT = SDOperand(CurDAG->getTargetNode(PPC::ADDZE, MVT::i32, SDOperand(Op, 0), SDOperand(Op, 1)), 0); return CurDAG->SelectNodeTo(N, PPC::NEG, MVT::i32, PT); } } // Other cases are autogenerated. break; } case ISD::AND: { unsigned Imm, Imm2, SH, MB, ME; // If this is an and of a value rotated between 0 and 31 bits and then and'd // with a mask, emit rlwinm if (isInt32Immediate(N->getOperand(1), Imm) && isRotateAndMask(N->getOperand(0).Val, Imm, false, SH, MB, ME)) { SDOperand Val = N->getOperand(0).getOperand(0); AddToISelQueue(Val); SDOperand Ops[] = { Val, getI32Imm(SH), getI32Imm(MB), getI32Imm(ME) }; return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops, 4); } // If this is just a masked value where the input is not handled above, and // is not a rotate-left (handled by a pattern in the .td file), emit rlwinm if (isInt32Immediate(N->getOperand(1), Imm) && isRunOfOnes(Imm, MB, ME) && N->getOperand(0).getOpcode() != ISD::ROTL) { SDOperand Val = N->getOperand(0); AddToISelQueue(Val); SDOperand Ops[] = { Val, getI32Imm(0), getI32Imm(MB), getI32Imm(ME) }; return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops, 4); } // AND X, 0 -> 0, not "rlwinm 32". if (isInt32Immediate(N->getOperand(1), Imm) && (Imm == 0)) { AddToISelQueue(N->getOperand(1)); ReplaceUses(SDOperand(N, 0), N->getOperand(1)); return NULL; } // ISD::OR doesn't get all the bitfield insertion fun. // (and (or x, c1), c2) where isRunOfOnes(~(c1^c2)) is a bitfield insert if (isInt32Immediate(N->getOperand(1), Imm) && N->getOperand(0).getOpcode() == ISD::OR && isInt32Immediate(N->getOperand(0).getOperand(1), Imm2)) { unsigned MB, ME; Imm = ~(Imm^Imm2); if (isRunOfOnes(Imm, MB, ME)) { AddToISelQueue(N->getOperand(0).getOperand(0)); AddToISelQueue(N->getOperand(0).getOperand(1)); SDOperand Ops[] = { N->getOperand(0).getOperand(0), N->getOperand(0).getOperand(1), getI32Imm(0), getI32Imm(MB),getI32Imm(ME) }; return CurDAG->getTargetNode(PPC::RLWIMI, MVT::i32, Ops, 5); } } // Other cases are autogenerated. break; } case ISD::OR: if (N->getValueType(0) == MVT::i32) if (SDNode *I = SelectBitfieldInsert(N)) return I; // Other cases are autogenerated. break; case ISD::SHL: { unsigned Imm, SH, MB, ME; if (isOpcWithIntImmediate(N->getOperand(0).Val, ISD::AND, Imm) && isRotateAndMask(N, Imm, true, SH, MB, ME)) { AddToISelQueue(N->getOperand(0).getOperand(0)); SDOperand Ops[] = { N->getOperand(0).getOperand(0), getI32Imm(SH), getI32Imm(MB), getI32Imm(ME) }; return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops, 4); } // Other cases are autogenerated. break; } case ISD::SRL: { unsigned Imm, SH, MB, ME; if (isOpcWithIntImmediate(N->getOperand(0).Val, ISD::AND, Imm) && isRotateAndMask(N, Imm, true, SH, MB, ME)) { AddToISelQueue(N->getOperand(0).getOperand(0)); SDOperand Ops[] = { N->getOperand(0).getOperand(0), getI32Imm(SH), getI32Imm(MB), getI32Imm(ME) }; return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops, 4); } // Other cases are autogenerated. break; } case ISD::SELECT_CC: { ISD::CondCode CC = cast(N->getOperand(4))->get(); // Handle the setcc cases here. select_cc lhs, 0, 1, 0, cc if (ConstantSDNode *N1C = dyn_cast(N->getOperand(1))) if (ConstantSDNode *N2C = dyn_cast(N->getOperand(2))) if (ConstantSDNode *N3C = dyn_cast(N->getOperand(3))) if (N1C->isNullValue() && N3C->isNullValue() && N2C->getValue() == 1ULL && CC == ISD::SETNE && // FIXME: Implement this optzn for PPC64. N->getValueType(0) == MVT::i32) { AddToISelQueue(N->getOperand(0)); SDNode *Tmp = CurDAG->getTargetNode(PPC::ADDIC, MVT::i32, MVT::Flag, N->getOperand(0), getI32Imm(~0U)); return CurDAG->SelectNodeTo(N, PPC::SUBFE, MVT::i32, SDOperand(Tmp, 0), N->getOperand(0), SDOperand(Tmp, 1)); } SDOperand CCReg = SelectCC(N->getOperand(0), N->getOperand(1), CC); unsigned BROpc = getBCCForSetCC(CC); unsigned SelectCCOp; if (N->getValueType(0) == MVT::i32) SelectCCOp = PPC::SELECT_CC_I4; else if (N->getValueType(0) == MVT::i64) SelectCCOp = PPC::SELECT_CC_I8; else if (N->getValueType(0) == MVT::f32) SelectCCOp = PPC::SELECT_CC_F4; else if (N->getValueType(0) == MVT::f64) SelectCCOp = PPC::SELECT_CC_F8; else SelectCCOp = PPC::SELECT_CC_VRRC; AddToISelQueue(N->getOperand(2)); AddToISelQueue(N->getOperand(3)); SDOperand Ops[] = { CCReg, N->getOperand(2), N->getOperand(3), getI32Imm(BROpc) }; return CurDAG->SelectNodeTo(N, SelectCCOp, N->getValueType(0), Ops, 4); } case ISD::BR_CC: { AddToISelQueue(N->getOperand(0)); ISD::CondCode CC = cast(N->getOperand(1))->get(); SDOperand CondCode = SelectCC(N->getOperand(2), N->getOperand(3), CC); SDOperand Ops[] = { CondCode, getI32Imm(getBCCForSetCC(CC)), N->getOperand(4), N->getOperand(0) }; return CurDAG->SelectNodeTo(N, PPC::COND_BRANCH, MVT::Other, Ops, 4); } case ISD::BRIND: { // FIXME: Should custom lower this. SDOperand Chain = N->getOperand(0); SDOperand Target = N->getOperand(1); AddToISelQueue(Chain); AddToISelQueue(Target); unsigned Opc = Target.getValueType() == MVT::i32 ? PPC::MTCTR : PPC::MTCTR8; Chain = SDOperand(CurDAG->getTargetNode(Opc, MVT::Other, Target, Chain), 0); return CurDAG->SelectNodeTo(N, PPC::BCTR, MVT::Other, Chain); } // FIXME: These are manually selected because tblgen isn't handling varargs // nodes correctly. case PPCISD::BCTRL: return MySelect_PPCbctrl(Op); case PPCISD::CALL: return MySelect_PPCcall(Op); } return SelectCode(Op); } // FIXME: This is manually selected because tblgen isn't handling varargs nodes // correctly. SDNode *PPCDAGToDAGISel::MySelect_PPCbctrl(SDOperand N) { SDOperand Chain(0, 0); bool hasFlag = N.getOperand(N.getNumOperands()-1).getValueType() == MVT::Flag; SmallVector Ops; // Push varargs arguments, including optional flag. for (unsigned i = 1, e = N.getNumOperands()-hasFlag; i != e; ++i) { Chain = N.getOperand(i); AddToISelQueue(Chain); Ops.push_back(Chain); } Chain = N.getOperand(0); AddToISelQueue(Chain); Ops.push_back(Chain); if (hasFlag) { Chain = N.getOperand(N.getNumOperands()-1); AddToISelQueue(Chain); Ops.push_back(Chain); } return CurDAG->getTargetNode(PPC::BCTRL, MVT::Other, MVT::Flag, &Ops[0], Ops.size()); } // FIXME: This is manually selected because tblgen isn't handling varargs nodes // correctly. SDNode *PPCDAGToDAGISel::MySelect_PPCcall(SDOperand N) { SDOperand Chain(0, 0); SDOperand N1(0, 0); SDOperand Tmp0(0, 0); Chain = N.getOperand(0); N1 = N.getOperand(1); // Pattern: (PPCcall:void (imm:i32):$func) // Emits: (BLA:void (imm:i32):$func) // Pattern complexity = 4 cost = 1 if (N1.getOpcode() == ISD::Constant) { unsigned Tmp0C = (unsigned)cast(N1)->getValue(); SmallVector Ops; Ops.push_back(CurDAG->getTargetConstant(Tmp0C, MVT::i32)); bool hasFlag = N.getOperand(N.getNumOperands()-1).getValueType() == MVT::Flag; // Push varargs arguments, not including optional flag. for (unsigned i = 2, e = N.getNumOperands()-hasFlag; i != e; ++i) { Chain = N.getOperand(i); AddToISelQueue(Chain); Ops.push_back(Chain); } Chain = N.getOperand(0); AddToISelQueue(Chain); Ops.push_back(Chain); if (hasFlag) { Chain = N.getOperand(N.getNumOperands()-1); AddToISelQueue(Chain); Ops.push_back(Chain); } return CurDAG->getTargetNode(PPC::BLA, MVT::Other, MVT::Flag, &Ops[0], Ops.size()); } // Pattern: (PPCcall:void (tglobaladdr:i32):$dst) // Emits: (BL:void (tglobaladdr:i32):$dst) // Pattern complexity = 4 cost = 1 if (N1.getOpcode() == ISD::TargetGlobalAddress) { SmallVector Ops; Ops.push_back(N1); bool hasFlag = N.getOperand(N.getNumOperands()-1).getValueType() == MVT::Flag; // Push varargs arguments, not including optional flag. for (unsigned i = 2, e = N.getNumOperands()-hasFlag; i != e; ++i) { Chain = N.getOperand(i); AddToISelQueue(Chain); Ops.push_back(Chain); } Chain = N.getOperand(0); AddToISelQueue(Chain); Ops.push_back(Chain); if (hasFlag) { Chain = N.getOperand(N.getNumOperands()-1); AddToISelQueue(Chain); Ops.push_back(Chain); } return CurDAG->getTargetNode(PPC::BL, MVT::Other, MVT::Flag, &Ops[0], Ops.size()); } // Pattern: (PPCcall:void (texternalsym:i32):$dst) // Emits: (BL:void (texternalsym:i32):$dst) // Pattern complexity = 4 cost = 1 if (N1.getOpcode() == ISD::TargetExternalSymbol) { std::vector Ops; Ops.push_back(N1); bool hasFlag = N.getOperand(N.getNumOperands()-1).getValueType() == MVT::Flag; // Push varargs arguments, not including optional flag. for (unsigned i = 2, e = N.getNumOperands()-hasFlag; i != e; ++i) { Chain = N.getOperand(i); AddToISelQueue(Chain); Ops.push_back(Chain); } Chain = N.getOperand(0); AddToISelQueue(Chain); Ops.push_back(Chain); if (hasFlag) { Chain = N.getOperand(N.getNumOperands()-1); AddToISelQueue(Chain); Ops.push_back(Chain); } return CurDAG->getTargetNode(PPC::BL, MVT::Other, MVT::Flag, &Ops[0], Ops.size()); } std::cerr << "Cannot yet select: "; N.Val->dump(CurDAG); std::cerr << '\n'; abort(); return NULL; } /// createPPCISelDag - This pass converts a legalized DAG into a /// PowerPC-specific DAG, ready for instruction scheduling. /// FunctionPass *llvm::createPPCISelDag(PPCTargetMachine &TM) { return new PPCDAGToDAGISel(TM); }