//===-- PPC32ISelDAGToDAG.cpp - PPC32 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 32 bit PowerPC, // converting from a legalized dag to a PPC dag. // //===----------------------------------------------------------------------===// #include "PowerPC.h" #include "PPC32TargetMachine.h" #include "PPC32ISelLowering.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/GlobalValue.h" #include "llvm/Support/Debug.h" #include "llvm/Support/MathExtras.h" using namespace llvm; namespace { Statistic<> FusedFP ("ppc-codegen", "Number of fused fp operations"); Statistic<> FrameOff("ppc-codegen", "Number of frame idx offsets collapsed"); //===--------------------------------------------------------------------===// /// PPC32DAGToDAGISel - PPC32 specific code to select PPC32 machine /// instructions for SelectionDAG operations. /// class PPC32DAGToDAGISel : public SelectionDAGISel { PPC32TargetLowering PPC32Lowering; unsigned GlobalBaseReg; public: PPC32DAGToDAGISel(TargetMachine &TM) : SelectionDAGISel(PPC32Lowering), PPC32Lowering(TM) {} virtual bool runOnFunction(Function &Fn) { // Make sure we re-emit a set of the global base reg if necessary GlobalBaseReg = 0; return SelectionDAGISel::runOnFunction(Fn); } /// getI32Imm - Return a target constant with the specified value, of type /// i32. inline SDOperand getI32Imm(unsigned Imm) { return CurDAG->getTargetConstant(Imm, MVT::i32); } /// getGlobalBaseReg - insert code into the entry mbb to materialize the PIC /// base register. Return the virtual register that holds this value. SDOperand getGlobalBaseReg(); // Select - Convert the specified operand from a target-independent to a // target-specific node if it hasn't already been changed. SDOperand Select(SDOperand Op); SDNode *SelectIntImmediateExpr(SDOperand LHS, SDOperand RHS, unsigned OCHi, unsigned OCLo, bool IsArithmetic = false, bool Negate = false); 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); /// SelectAddr - Given the specified address, return the two operands for a /// load/store instruction, and return true if it should be an indexed [r+r] /// operation. bool SelectAddr(SDOperand Addr, SDOperand &Op1, SDOperand &Op2); /// InstructionSelectBasicBlock - This callback is invoked by /// SelectionDAGISel when it has created a SelectionDAG for us to codegen. virtual void InstructionSelectBasicBlock(SelectionDAG &DAG) { DEBUG(BB->dump()); // Select target instructions for the DAG. Select(DAG.getRoot()); DAG.RemoveDeadNodes(); // Emit machine code to BB. ScheduleAndEmitDAG(DAG); } virtual const char *getPassName() const { return "PowerPC DAG->DAG Pattern Instruction Selection"; } }; } /// getGlobalBaseReg - Output the instructions required to put the /// base address to use for accessing globals into a register. /// SDOperand PPC32DAGToDAGISel::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(); GlobalBaseReg = RegMap->createVirtualRegister(PPC32::GPRCRegisterClass); BuildMI(FirstMBB, MBBI, PPC::MovePCtoLR, 0, PPC::LR); BuildMI(FirstMBB, MBBI, PPC::MFLR, 1, GlobalBaseReg); } return CurDAG->getRegister(GlobalBaseReg, MVT::i32); } // isIntImmediate - This method tests to see if a constant operand. // If so Imm will receive the 32 bit value. static bool isIntImmediate(SDNode *N, unsigned& Imm) { if (N->getOpcode() == ISD::Constant) { Imm = cast(N)->getValue(); return true; } return false; } // isOprShiftImm - Returns true if the specified operand is a shift opcode with // a immediate shift count less than 32. static bool isOprShiftImm(SDNode *N, unsigned& Opc, unsigned& SH) { Opc = N->getOpcode(); return (Opc == ISD::SHL || Opc == ISD::SRL || Opc == ISD::SRA) && isIntImmediate(N->getOperand(1).Val, SH) && SH < 32; } // 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) { 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 if (isShiftedMask_32(Val = ~Val)) { // invert mask // 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; } // isRotateAndMask - Returns true if Mask and Shift can be folded in to a rotate // and mask opcode and mask operation. static bool isRotateAndMask(SDNode *N, unsigned Mask, bool IsShiftMask, unsigned &SH, unsigned &MB, unsigned &ME) { unsigned Shift = 32; unsigned Indeterminant = ~0; // bit mask marking indeterminant results unsigned Opcode = N->getOpcode(); if (!isIntImmediate(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::SRA || 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 { return false; } // if the mask doesn't intersect any Indeterminant bits if (Mask && !(Mask & Indeterminant)) { SH = Shift; // make sure the mask is still a mask (wrap arounds may not be) return isRunOfOnes(Mask, MB, ME); } return false; } // 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 && isIntImmediate(N->getOperand(1).Val, Imm); } // isOprNot - Returns true if the specified operand is an xor with immediate -1. static bool isOprNot(SDNode *N) { unsigned Imm; return isOpcWithIntImmediate(N, ISD::XOR, Imm) && (signed)Imm == -1; } // Immediate constant composers. // Lo16 - grabs the lo 16 bits from a 32 bit constant. // Hi16 - grabs the hi 16 bits from a 32 bit constant. // HA16 - computes the hi bits required if the lo bits are add/subtracted in // arithmethically. static unsigned Lo16(unsigned x) { return x & 0x0000FFFF; } static unsigned Hi16(unsigned x) { return Lo16(x >> 16); } static unsigned HA16(unsigned x) { return Hi16((signed)x - (signed short)x); } // isIntImmediate - This method tests to see if a constant operand. // If so Imm will receive the 32 bit value. static bool isIntImmediate(SDOperand N, unsigned& Imm) { if (ConstantSDNode *CN = dyn_cast(N)) { Imm = (unsigned)CN->getSignExtended(); return true; } return false; } /// SelectBitfieldInsert - turn an or of two masked values into /// the rotate left word immediate then mask insert (rlwimi) instruction. /// Returns true on success, false if the caller still needs to select OR. /// /// Patterns matched: /// 1. or shl, and 5. or and, and /// 2. or and, shl 6. or shl, shr /// 3. or shr, and 7. or shr, shl /// 4. or and, shr SDNode *PPC32DAGToDAGISel::SelectBitfieldInsert(SDNode *N) { bool IsRotate = false; unsigned TgtMask = 0xFFFFFFFF, InsMask = 0xFFFFFFFF, SH = 0; unsigned Value; SDOperand Op0 = N->getOperand(0); SDOperand Op1 = N->getOperand(1); unsigned Op0Opc = Op0.getOpcode(); unsigned Op1Opc = Op1.getOpcode(); // Verify that we have the correct opcodes if (ISD::SHL != Op0Opc && ISD::SRL != Op0Opc && ISD::AND != Op0Opc) return false; if (ISD::SHL != Op1Opc && ISD::SRL != Op1Opc && ISD::AND != Op1Opc) return false; // Generate Mask value for Target if (isIntImmediate(Op0.getOperand(1), Value)) { switch(Op0Opc) { case ISD::SHL: TgtMask <<= Value; break; case ISD::SRL: TgtMask >>= Value; break; case ISD::AND: TgtMask &= Value; break; } } else { return 0; } // Generate Mask value for Insert if (isIntImmediate(Op1.getOperand(1), Value)) { switch(Op1Opc) { case ISD::SHL: SH = Value; InsMask <<= SH; if (Op0Opc == ISD::SRL) IsRotate = true; break; case ISD::SRL: SH = Value; InsMask >>= SH; SH = 32-SH; if (Op0Opc == ISD::SHL) IsRotate = true; break; case ISD::AND: InsMask &= Value; break; } } else { return 0; } // If both of the inputs are ANDs and one of them has a logical shift by // constant as its input, make that AND the inserted value so that we can // combine the shift into the rotate part of the rlwimi instruction bool IsAndWithShiftOp = false; if (Op0Opc == ISD::AND && Op1Opc == ISD::AND) { if (Op1.getOperand(0).getOpcode() == ISD::SHL || Op1.getOperand(0).getOpcode() == ISD::SRL) { if (isIntImmediate(Op1.getOperand(0).getOperand(1), Value)) { SH = Op1.getOperand(0).getOpcode() == ISD::SHL ? Value : 32 - Value; IsAndWithShiftOp = true; } } else if (Op0.getOperand(0).getOpcode() == ISD::SHL || Op0.getOperand(0).getOpcode() == ISD::SRL) { if (isIntImmediate(Op0.getOperand(0).getOperand(1), Value)) { std::swap(Op0, Op1); std::swap(TgtMask, InsMask); SH = Op1.getOperand(0).getOpcode() == ISD::SHL ? Value : 32 - Value; IsAndWithShiftOp = true; } } } // Verify that the Target mask and Insert mask together form a full word mask // and that the Insert mask is a run of set bits (which implies both are runs // of set bits). Given that, Select the arguments and generate the rlwimi // instruction. unsigned MB, ME; if (((TgtMask & InsMask) == 0) && isRunOfOnes(InsMask, MB, ME)) { bool fullMask = (TgtMask ^ InsMask) == 0xFFFFFFFF; bool Op0IsAND = Op0Opc == ISD::AND; // Check for rotlwi / rotrwi here, a special case of bitfield insert // where both bitfield halves are sourced from the same value. if (IsRotate && fullMask && N->getOperand(0).getOperand(0) == N->getOperand(1).getOperand(0)) { Op0 = CurDAG->getTargetNode(PPC::RLWINM, MVT::i32, Select(N->getOperand(0).getOperand(0)), getI32Imm(SH), getI32Imm(0), getI32Imm(31)); return Op0.Val; } SDOperand Tmp1 = (Op0IsAND && fullMask) ? Select(Op0.getOperand(0)) : Select(Op0); SDOperand Tmp2 = IsAndWithShiftOp ? Select(Op1.getOperand(0).getOperand(0)) : Select(Op1.getOperand(0)); Op0 = CurDAG->getTargetNode(PPC::RLWIMI, MVT::i32, Tmp1, Tmp2, getI32Imm(SH), getI32Imm(MB), getI32Imm(ME)); return Op0.Val; } return 0; } // SelectIntImmediateExpr - Choose code for integer operations with an immediate // operand. SDNode *PPC32DAGToDAGISel::SelectIntImmediateExpr(SDOperand LHS, SDOperand RHS, unsigned OCHi, unsigned OCLo, bool IsArithmetic, bool Negate) { // Check to make sure this is a constant. ConstantSDNode *CN = dyn_cast(RHS); // Exit if not a constant. if (!CN) return 0; // Extract immediate. unsigned C = (unsigned)CN->getValue(); // Negate if required (ISD::SUB). if (Negate) C = -C; // Get the hi and lo portions of constant. unsigned Hi = IsArithmetic ? HA16(C) : Hi16(C); unsigned Lo = Lo16(C); // If two instructions are needed and usage indicates it would be better to // load immediate into a register, bail out. if (Hi && Lo && CN->use_size() > 2) return false; // Select the first operand. SDOperand Opr0 = Select(LHS); if (Lo) // Add in the lo-part. Opr0 = CurDAG->getTargetNode(OCLo, MVT::i32, Opr0, getI32Imm(Lo)); if (Hi) // Add in the hi-part. Opr0 = CurDAG->getTargetNode(OCHi, MVT::i32, Opr0, getI32Imm(Hi)); return Opr0.Val; } /// SelectAddr - Given the specified address, return the two operands for a /// load/store instruction, and return true if it should be an indexed [r+r] /// operation. bool PPC32DAGToDAGISel::SelectAddr(SDOperand Addr, SDOperand &Op1, SDOperand &Op2) { unsigned imm = 0; if (Addr.getOpcode() == ISD::ADD) { if (isIntImmediate(Addr.getOperand(1), imm) && isInt16(imm)) { Op1 = getI32Imm(Lo16(imm)); if (isa(Addr.getOperand(0))) { ++FrameOff; Op2 = Addr.getOperand(0); } else { Op2 = Select(Addr.getOperand(0)); } return false; } else { Op1 = Select(Addr.getOperand(0)); Op2 = Select(Addr.getOperand(1)); return true; // [r+r] } } // Now check if we're dealing with a global, and whether or not we should emit // an optimized load or store for statics. if (GlobalAddressSDNode *GN = dyn_cast(Addr)) { GlobalValue *GV = GN->getGlobal(); if (!GV->hasWeakLinkage() && !GV->isExternal()) { Op1 = CurDAG->getTargetGlobalAddress(GV, MVT::i32); if (PICEnabled) Op2 = CurDAG->getTargetNode(PPC::ADDIS, MVT::i32, getGlobalBaseReg(), Op1); else Op2 = CurDAG->getTargetNode(PPC::LIS, MVT::i32, Op1); return false; } } else if (isa(Addr)) { Op1 = getI32Imm(0); Op2 = Addr; return false; } else if (ConstantPoolSDNode *CP = dyn_cast(Addr)) { Op1 = Addr; if (PICEnabled) Op2 = CurDAG->getTargetNode(PPC::ADDIS, MVT::i32, getGlobalBaseReg(),Op1); else Op2 = CurDAG->getTargetNode(PPC::LIS, MVT::i32, Op1); return false; } Op1 = getI32Imm(0); Op2 = Select(Addr); return false; } /// SelectCC - Select a comparison of the specified values with the specified /// condition code, returning the CR# of the expression. SDOperand PPC32DAGToDAGISel::SelectCC(SDOperand LHS, SDOperand RHS, ISD::CondCode CC) { // Always select the LHS. LHS = Select(LHS); // Use U to determine whether the SETCC immediate range is signed or not. if (MVT::isInteger(LHS.getValueType())) { bool U = ISD::isUnsignedIntSetCC(CC); unsigned Imm; if (isIntImmediate(RHS, Imm) && ((U && isUInt16(Imm)) || (!U && isInt16(Imm)))) return CurDAG->getTargetNode(U ? PPC::CMPLWI : PPC::CMPWI, MVT::i32, LHS, getI32Imm(Lo16(Imm))); return CurDAG->getTargetNode(U ? PPC::CMPLW : PPC::CMPW, MVT::i32, LHS, Select(RHS)); } else { return CurDAG->getTargetNode(PPC::FCMPU, MVT::i32, LHS, Select(RHS)); } } /// 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::SETEQ: return PPC::BEQ; case ISD::SETNE: return PPC::BNE; case ISD::SETULT: case ISD::SETLT: return PPC::BLT; case ISD::SETULE: case ISD::SETLE: return PPC::BLE; case ISD::SETUGT: case ISD::SETGT: return PPC::BGT; case ISD::SETUGE: case ISD::SETGE: return PPC::BGE; } return 0; } // Select - Convert the specified operand from a target-independent to a // target-specific node if it hasn't already been changed. SDOperand PPC32DAGToDAGISel::Select(SDOperand Op) { SDNode *N = Op.Val; if (N->getOpcode() >= ISD::BUILTIN_OP_END) return Op; // Already selected. switch (N->getOpcode()) { default: std::cerr << "Cannot yet select: "; N->dump(); std::cerr << "\n"; abort(); case ISD::EntryToken: // These leaves remain the same. case ISD::UNDEF: return Op; case ISD::TokenFactor: { SDOperand New; if (N->getNumOperands() == 2) { SDOperand Op0 = Select(N->getOperand(0)); SDOperand Op1 = Select(N->getOperand(1)); New = CurDAG->getNode(ISD::TokenFactor, MVT::Other, Op0, Op1); } else { std::vector Ops; for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) Ops.push_back(Select(N->getOperand(i))); New = CurDAG->getNode(ISD::TokenFactor, MVT::Other, Ops); } if (New.Val != N) { CurDAG->ReplaceAllUsesWith(N, New.Val); N = New.Val; } break; } case ISD::CopyFromReg: { SDOperand Chain = Select(N->getOperand(0)); if (Chain == N->getOperand(0)) return Op; // No change SDOperand New = CurDAG->getCopyFromReg(Chain, cast(N->getOperand(1))->getReg(), N->getValueType(0)); return New.getValue(Op.ResNo); } case ISD::CopyToReg: { SDOperand Chain = Select(N->getOperand(0)); SDOperand Reg = N->getOperand(1); SDOperand Val = Select(N->getOperand(2)); if (Chain != N->getOperand(0) || Val != N->getOperand(2)) { SDOperand New = CurDAG->getNode(ISD::CopyToReg, MVT::Other, Chain, Reg, Val); CurDAG->ReplaceAllUsesWith(N, New.Val); N = New.Val; } break; } case ISD::Constant: { assert(N->getValueType(0) == MVT::i32); unsigned v = (unsigned)cast(N)->getValue(); unsigned Hi = HA16(v); unsigned Lo = Lo16(v); if (Hi && Lo) { SDOperand Top = CurDAG->getTargetNode(PPC::LIS, MVT::i32, getI32Imm(v >> 16)); CurDAG->SelectNodeTo(N, MVT::i32, PPC::ORI, Top, getI32Imm(v & 0xFFFF)); } else if (Lo) { CurDAG->SelectNodeTo(N, MVT::i32, PPC::LI, getI32Imm(v)); } else { CurDAG->SelectNodeTo(N, MVT::i32, PPC::LIS, getI32Imm(v >> 16)); } break; } case ISD::GlobalAddress: { GlobalValue *GV = cast(N)->getGlobal(); SDOperand Tmp; SDOperand GA = CurDAG->getTargetGlobalAddress(GV, MVT::i32); if (PICEnabled) Tmp = CurDAG->getTargetNode(PPC::ADDIS, MVT::i32, getGlobalBaseReg(), GA); else Tmp = CurDAG->getTargetNode(PPC::LIS, MVT::i32, GA); if (GV->hasWeakLinkage() || GV->isExternal()) CurDAG->SelectNodeTo(N, MVT::i32, PPC::LWZ, GA, Tmp); else CurDAG->SelectNodeTo(N, MVT::i32, PPC::LA, Tmp, GA); break; } case ISD::SIGN_EXTEND_INREG: switch(cast(N->getOperand(1))->getVT()) { default: assert(0 && "Illegal type in SIGN_EXTEND_INREG"); break; case MVT::i16: CurDAG->SelectNodeTo(N, MVT::i32, PPC::EXTSH, Select(N->getOperand(0))); break; case MVT::i8: CurDAG->SelectNodeTo(N, MVT::i32, PPC::EXTSB, Select(N->getOperand(0))); break; } break; case ISD::CTLZ: assert(N->getValueType(0) == MVT::i32); CurDAG->SelectNodeTo(N, MVT::i32, PPC::CNTLZW, Select(N->getOperand(0))); break; case ISD::ADD: { MVT::ValueType Ty = N->getValueType(0); if (Ty == MVT::i32) { if (SDNode *I = SelectIntImmediateExpr(N->getOperand(0), N->getOperand(1), PPC::ADDIS, PPC::ADDI, true)) { CurDAG->ReplaceAllUsesWith(N, I); N = I; } else { CurDAG->SelectNodeTo(N, Ty, PPC::ADD, Select(N->getOperand(0)), Select(N->getOperand(1))); } break; } if (!NoExcessFPPrecision) { // Match FMA ops if (N->getOperand(0).getOpcode() == ISD::MUL && N->getOperand(0).Val->hasOneUse()) { ++FusedFP; // Statistic CurDAG->SelectNodeTo(N, Ty, Ty == MVT::f64 ? PPC::FMADD : PPC::FMADDS, Select(N->getOperand(0).getOperand(0)), Select(N->getOperand(0).getOperand(1)), Select(N->getOperand(1))); break; } else if (N->getOperand(1).getOpcode() == ISD::MUL && N->getOperand(1).hasOneUse()) { ++FusedFP; // Statistic CurDAG->SelectNodeTo(N, Ty, Ty == MVT::f64 ? PPC::FMADD : PPC::FMADDS, Select(N->getOperand(1).getOperand(0)), Select(N->getOperand(1).getOperand(1)), Select(N->getOperand(0))); break; } } CurDAG->SelectNodeTo(N, Ty, Ty == MVT::f64 ? PPC::FADD : PPC::FADDS, Select(N->getOperand(0)), Select(N->getOperand(1))); break; } case ISD::SUB: { MVT::ValueType Ty = N->getValueType(0); if (Ty == MVT::i32) { unsigned Imm; if (isIntImmediate(N->getOperand(0), Imm) && isInt16(Imm)) { if (0 == Imm) CurDAG->SelectNodeTo(N, Ty, PPC::NEG, Select(N->getOperand(1))); else CurDAG->SelectNodeTo(N, Ty, PPC::SUBFIC, Select(N->getOperand(1)), getI32Imm(Lo16(Imm))); break; } if (SDNode *I = SelectIntImmediateExpr(N->getOperand(0), N->getOperand(1), PPC::ADDIS, PPC::ADDI, true, true)) { CurDAG->ReplaceAllUsesWith(N, I); N = I; } else { CurDAG->SelectNodeTo(N, Ty, PPC::SUBF, Select(N->getOperand(1)), Select(N->getOperand(0))); } break; } if (!NoExcessFPPrecision) { // Match FMA ops if (N->getOperand(0).getOpcode() == ISD::MUL && N->getOperand(0).Val->hasOneUse()) { ++FusedFP; // Statistic CurDAG->SelectNodeTo(N, Ty, Ty == MVT::f64 ? PPC::FMSUB : PPC::FMSUBS, Select(N->getOperand(0).getOperand(0)), Select(N->getOperand(0).getOperand(1)), Select(N->getOperand(1))); break; } else if (N->getOperand(1).getOpcode() == ISD::MUL && N->getOperand(1).Val->hasOneUse()) { ++FusedFP; // Statistic CurDAG->SelectNodeTo(N, Ty, Ty == MVT::f64 ? PPC::FNMSUB : PPC::FNMSUBS, Select(N->getOperand(1).getOperand(0)), Select(N->getOperand(1).getOperand(1)), Select(N->getOperand(0))); break; } } CurDAG->SelectNodeTo(N, Ty, Ty == MVT::f64 ? PPC::FSUB : PPC::FSUBS, Select(N->getOperand(0)), Select(N->getOperand(1))); break; } case ISD::MUL: { unsigned Imm, Opc; if (isIntImmediate(N->getOperand(1), Imm) && isInt16(Imm)) { CurDAG->SelectNodeTo(N, N->getValueType(0), PPC::MULLI, Select(N->getOperand(0)), getI32Imm(Lo16(Imm))); break; } switch (N->getValueType(0)) { default: assert(0 && "Unhandled multiply type!"); case MVT::i32: Opc = PPC::MULLW; break; case MVT::f32: Opc = PPC::FMULS; break; case MVT::f64: Opc = PPC::FMUL; break; } CurDAG->SelectNodeTo(N, N->getValueType(0), Opc, Select(N->getOperand(0)), Select(N->getOperand(1))); break; } case ISD::MULHS: assert(N->getValueType(0) == MVT::i32); CurDAG->SelectNodeTo(N, MVT::i32, PPC::MULHW, Select(N->getOperand(0)), Select(N->getOperand(1))); break; case ISD::MULHU: assert(N->getValueType(0) == MVT::i32); CurDAG->SelectNodeTo(N, MVT::i32, PPC::MULHWU, Select(N->getOperand(0)), Select(N->getOperand(1))); break; case ISD::AND: { unsigned Imm; // If this is an and of a value rotated between 0 and 31 bits and then and'd // with a mask, emit rlwinm if (isIntImmediate(N->getOperand(1), Imm) && (isShiftedMask_32(Imm) || isShiftedMask_32(~Imm))) { SDOperand Val; unsigned SH, MB, ME; if (isRotateAndMask(N->getOperand(0).Val, Imm, false, SH, MB, ME)) { Val = Select(N->getOperand(0).getOperand(0)); } else { Val = Select(N->getOperand(0)); isRunOfOnes(Imm, MB, ME); SH = 0; } CurDAG->SelectNodeTo(N, MVT::i32, PPC::RLWINM, Val, getI32Imm(SH), getI32Imm(MB), getI32Imm(ME)); break; } // If this is an and with an immediate that isn't a mask, then codegen it as // high and low 16 bit immediate ands. if (SDNode *I = SelectIntImmediateExpr(N->getOperand(0), N->getOperand(1), PPC::ANDISo, PPC::ANDIo)) { CurDAG->ReplaceAllUsesWith(N, I); N = I; break; } // Finally, check for the case where we are being asked to select // and (not(a), b) or and (a, not(b)) which can be selected as andc. if (isOprNot(N->getOperand(0).Val)) CurDAG->SelectNodeTo(N, MVT::i32, PPC::ANDC, Select(N->getOperand(1)), Select(N->getOperand(0).getOperand(0))); else if (isOprNot(N->getOperand(1).Val)) CurDAG->SelectNodeTo(N, MVT::i32, PPC::ANDC, Select(N->getOperand(0)), Select(N->getOperand(1).getOperand(0))); else CurDAG->SelectNodeTo(N, MVT::i32, PPC::AND, Select(N->getOperand(0)), Select(N->getOperand(1))); break; } case ISD::OR: if (SDNode *I = SelectBitfieldInsert(N)) { CurDAG->ReplaceAllUsesWith(N, I); N = I; break; } if (SDNode *I = SelectIntImmediateExpr(N->getOperand(0), N->getOperand(1), PPC::ORIS, PPC::ORI)) { CurDAG->ReplaceAllUsesWith(N, I); N = I; break; } // Finally, check for the case where we are being asked to select // 'or (not(a), b)' or 'or (a, not(b))' which can be selected as orc. if (isOprNot(N->getOperand(0).Val)) CurDAG->SelectNodeTo(N, MVT::i32, PPC::ORC, Select(N->getOperand(1)), Select(N->getOperand(0).getOperand(0))); else if (isOprNot(N->getOperand(1).Val)) CurDAG->SelectNodeTo(N, MVT::i32, PPC::ORC, Select(N->getOperand(0)), Select(N->getOperand(1).getOperand(0))); else CurDAG->SelectNodeTo(N, MVT::i32, PPC::OR, Select(N->getOperand(0)), Select(N->getOperand(1))); break; case ISD::XOR: // Check whether or not this node is a logical 'not'. This is represented // by llvm as a xor with the constant value -1 (all bits set). If this is a // 'not', then fold 'or' into 'nor', and so forth for the supported ops. if (isOprNot(N)) { unsigned Opc; SDOperand Val = Select(N->getOperand(0)); switch (Val.getTargetOpcode()) { default: Opc = 0; break; case PPC::OR: Opc = PPC::NOR; break; case PPC::AND: Opc = PPC::NAND; break; case PPC::XOR: Opc = PPC::EQV; break; } if (Opc) CurDAG->SelectNodeTo(N, MVT::i32, Opc, Val.getOperand(0), Val.getOperand(1)); else CurDAG->SelectNodeTo(N, MVT::i32, PPC::NOR, Val, Val); break; } // If this is a xor with an immediate other than -1, then codegen it as high // and low 16 bit immediate xors. if (SDNode *I = SelectIntImmediateExpr(N->getOperand(0), N->getOperand(1), PPC::XORIS, PPC::XORI)) { CurDAG->ReplaceAllUsesWith(N, I); N = I; break; } // Finally, check for the case where we are being asked to select // xor (not(a), b) which is equivalent to not(xor a, b), which is eqv if (isOprNot(N->getOperand(0).Val)) CurDAG->SelectNodeTo(N, MVT::i32, PPC::EQV, Select(N->getOperand(0).getOperand(0)), Select(N->getOperand(1))); else CurDAG->SelectNodeTo(N, MVT::i32, PPC::XOR, Select(N->getOperand(0)), Select(N->getOperand(1))); 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)) CurDAG->SelectNodeTo(N, MVT::i32, PPC::RLWINM, Select(N->getOperand(0).getOperand(0)), getI32Imm(SH), getI32Imm(MB), getI32Imm(ME)); else if (isIntImmediate(N->getOperand(1), Imm)) CurDAG->SelectNodeTo(N, MVT::i32, PPC::RLWINM, Select(N->getOperand(0)), getI32Imm(Imm), getI32Imm(0), getI32Imm(31-Imm)); else CurDAG->SelectNodeTo(N, MVT::i32, PPC::SLW, Select(N->getOperand(0)), Select(N->getOperand(1))); 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)) CurDAG->SelectNodeTo(N, MVT::i32, PPC::RLWINM, Select(N->getOperand(0).getOperand(0)), getI32Imm(SH), getI32Imm(MB), getI32Imm(ME)); else if (isIntImmediate(N->getOperand(1), Imm)) CurDAG->SelectNodeTo(N, MVT::i32, PPC::RLWINM, Select(N->getOperand(0)), getI32Imm(32-Imm), getI32Imm(Imm), getI32Imm(31)); else CurDAG->SelectNodeTo(N, MVT::i32, PPC::SRW, Select(N->getOperand(0)), Select(N->getOperand(1))); break; } case ISD::SRA: { unsigned Imm, SH, MB, ME; if (isOpcWithIntImmediate(N->getOperand(0).Val, ISD::AND, Imm) && isRotateAndMask(N, Imm, true, SH, MB, ME)) CurDAG->SelectNodeTo(N, MVT::i32, PPC::RLWINM, Select(N->getOperand(0).getOperand(0)), getI32Imm(SH), getI32Imm(MB), getI32Imm(ME)); else if (isIntImmediate(N->getOperand(1), Imm)) CurDAG->SelectNodeTo(N, MVT::i32, PPC::SRAWI, Select(N->getOperand(0)), getI32Imm(Imm)); else CurDAG->SelectNodeTo(N, MVT::i32, PPC::SRAW, Select(N->getOperand(0)), Select(N->getOperand(1))); break; } case ISD::FABS: CurDAG->SelectNodeTo(N, N->getValueType(0), PPC::FABS, Select(N->getOperand(0))); break; case ISD::FP_EXTEND: assert(MVT::f64 == N->getValueType(0) && MVT::f32 == N->getOperand(0).getValueType() && "Illegal FP_EXTEND"); CurDAG->SelectNodeTo(N, MVT::f64, PPC::FMR, Select(N->getOperand(0))); break; case ISD::FP_ROUND: assert(MVT::f32 == N->getValueType(0) && MVT::f64 == N->getOperand(0).getValueType() && "Illegal FP_ROUND"); CurDAG->SelectNodeTo(N, MVT::f32, PPC::FRSP, Select(N->getOperand(0))); break; case ISD::FNEG: { SDOperand Val = Select(N->getOperand(0)); MVT::ValueType Ty = N->getValueType(0); if (Val.Val->hasOneUse()) { unsigned Opc; switch (Val.getTargetOpcode()) { default: Opc = 0; break; case PPC::FABS: Opc = PPC::FNABS; break; case PPC::FMADD: Opc = PPC::FNMADD; break; case PPC::FMADDS: Opc = PPC::FNMADDS; break; case PPC::FMSUB: Opc = PPC::FNMSUB; break; case PPC::FMSUBS: Opc = PPC::FNMSUBS; break; } // If we inverted the opcode, then emit the new instruction with the // inverted opcode and the original instruction's operands. Otherwise, // fall through and generate a fneg instruction. if (Opc) { if (PPC::FNABS == Opc) CurDAG->SelectNodeTo(N, Ty, Opc, Val.getOperand(0)); else CurDAG->SelectNodeTo(N, Ty, Opc, Val.getOperand(0), Val.getOperand(1), Val.getOperand(2)); break; } } CurDAG->SelectNodeTo(N, Ty, PPC::FNEG, Val); break; } case ISD::FSQRT: { MVT::ValueType Ty = N->getValueType(0); CurDAG->SelectNodeTo(N, Ty, Ty == MVT::f64 ? PPC::FSQRT : PPC::FSQRTS, Select(N->getOperand(0))); break; } case ISD::LOAD: case ISD::EXTLOAD: case ISD::ZEXTLOAD: case ISD::SEXTLOAD: { SDOperand Op1, Op2; bool isIdx = SelectAddr(N->getOperand(1), Op1, Op2); MVT::ValueType TypeBeingLoaded = (N->getOpcode() == ISD::LOAD) ? N->getValueType(0) : cast(N->getOperand(3))->getVT(); unsigned Opc; switch (TypeBeingLoaded) { default: N->dump(); assert(0 && "Cannot load this type!"); case MVT::i1: case MVT::i8: Opc = isIdx ? PPC::LBZX : PPC::LBZ; break; case MVT::i16: if (N->getOpcode() == ISD::SEXTLOAD) { // SEXT load? Opc = isIdx ? PPC::LHAX : PPC::LHA; } else { Opc = isIdx ? PPC::LHZX : PPC::LHZ; } break; case MVT::i32: Opc = isIdx ? PPC::LWZX : PPC::LWZ; break; case MVT::f32: Opc = isIdx ? PPC::LFSX : PPC::LFS; break; case MVT::f64: Opc = isIdx ? PPC::LFDX : PPC::LFD; break; } CurDAG->SelectNodeTo(N, N->getValueType(0), MVT::Other, Opc, Op1, Op2, Select(N->getOperand(0))); break; } case ISD::TRUNCSTORE: case ISD::STORE: { SDOperand AddrOp1, AddrOp2; bool isIdx = SelectAddr(N->getOperand(2), AddrOp1, AddrOp2); unsigned Opc; if (N->getOpcode() == ISD::STORE) { switch (N->getOperand(1).getValueType()) { default: assert(0 && "unknown Type in store"); case MVT::i32: Opc = isIdx ? PPC::STWX : PPC::STW; break; case MVT::f64: Opc = isIdx ? PPC::STFDX : PPC::STFD; break; case MVT::f32: Opc = isIdx ? PPC::STFSX : PPC::STFS; break; } } else { //ISD::TRUNCSTORE switch(cast(N->getOperand(4))->getVT()) { default: assert(0 && "unknown Type in store"); case MVT::i1: case MVT::i8: Opc = isIdx ? PPC::STBX : PPC::STB; break; case MVT::i16: Opc = isIdx ? PPC::STHX : PPC::STH; break; } } CurDAG->SelectNodeTo(N, MVT::Other, Opc, Select(N->getOperand(1)), AddrOp1, AddrOp2, Select(N->getOperand(0))); break; } case ISD::CALLSEQ_START: case ISD::CALLSEQ_END: { unsigned Amt = cast(N->getOperand(1))->getValue(); unsigned Opc = N->getOpcode() == ISD::CALLSEQ_START ? PPC::ADJCALLSTACKDOWN : PPC::ADJCALLSTACKUP; CurDAG->SelectNodeTo(N, MVT::Other, Opc, Select(N->getOperand(0)), getI32Imm(Amt)); break; } case ISD::RET: { SDOperand Chain = Select(N->getOperand(0)); // Token chain. if (N->getNumOperands() > 1) { SDOperand Val = Select(N->getOperand(1)); switch (N->getOperand(1).getValueType()) { default: assert(0 && "Unknown return type!"); case MVT::f64: case MVT::f32: Chain = CurDAG->getCopyToReg(Chain, PPC::F1, Val); break; case MVT::i32: Chain = CurDAG->getCopyToReg(Chain, PPC::R3, Val); break; } if (N->getNumOperands() > 2) { assert(N->getOperand(1).getValueType() == MVT::i32 && N->getOperand(2).getValueType() == MVT::i32 && N->getNumOperands() == 2 && "Unknown two-register ret value!"); Val = Select(N->getOperand(2)); Chain = CurDAG->getCopyToReg(Chain, PPC::R4, Val); } } // Finally, select this to a blr (return) instruction. CurDAG->SelectNodeTo(N, MVT::Other, PPC::BLR, Chain); break; } case ISD::BR_CC: case ISD::BRTWOWAY_CC: { SDOperand Chain = Select(N->getOperand(0)); MachineBasicBlock *Dest = cast(N->getOperand(4))->getBasicBlock(); ISD::CondCode CC = cast(N->getOperand(1))->get(); SDOperand CondCode = SelectCC(N->getOperand(2), N->getOperand(3), CC); unsigned Opc = getBCCForSetCC(CC); // If this is a two way branch, then grab the fallthrough basic block // argument and build a PowerPC branch pseudo-op, suitable for long branch // conversion if necessary by the branch selection pass. Otherwise, emit a // standard conditional branch. if (N->getOpcode() == ISD::BRTWOWAY_CC) { MachineBasicBlock *Fallthrough = cast(N->getOperand(5))->getBasicBlock(); SDOperand CB = CurDAG->getTargetNode(PPC::COND_BRANCH, MVT::Other, CondCode, getI32Imm(Opc), N->getOperand(4), N->getOperand(5), Chain); CurDAG->SelectNodeTo(N, MVT::Other, PPC::B, N->getOperand(5), CB); } else { // Iterate to the next basic block ilist::iterator It = BB; ++It; // If the fallthrough path is off the end of the function, which would be // undefined behavior, set it to be the same as the current block because // we have nothing better to set it to, and leaving it alone will cause // the PowerPC Branch Selection pass to crash. if (It == BB->getParent()->end()) It = Dest; CurDAG->SelectNodeTo(N, MVT::Other, PPC::COND_BRANCH, CondCode, getI32Imm(Opc), N->getOperand(4), CurDAG->getBasicBlock(It), Chain); } break; } } return SDOperand(N, Op.ResNo); } /// createPPC32ISelDag - This pass converts a legalized DAG into a /// PowerPC-specific DAG, ready for instruction scheduling. /// FunctionPass *llvm::createPPC32ISelDag(TargetMachine &TM) { return new PPC32DAGToDAGISel(TM); }