//===-- SystemZISelLowering.cpp - SystemZ DAG Lowering Implementation -----==// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This file implements the SystemZTargetLowering class. // //===----------------------------------------------------------------------===// #define DEBUG_TYPE "systemz-lower" #include "SystemZISelLowering.h" #include "SystemZ.h" #include "SystemZTargetMachine.h" #include "SystemZSubtarget.h" #include "llvm/DerivedTypes.h" #include "llvm/Function.h" #include "llvm/Intrinsics.h" #include "llvm/CallingConv.h" #include "llvm/GlobalVariable.h" #include "llvm/GlobalAlias.h" #include "llvm/CodeGen/CallingConvLower.h" #include "llvm/CodeGen/MachineFrameInfo.h" #include "llvm/CodeGen/MachineFunction.h" #include "llvm/CodeGen/MachineInstrBuilder.h" #include "llvm/CodeGen/MachineRegisterInfo.h" #include "llvm/CodeGen/PseudoSourceValue.h" #include "llvm/CodeGen/SelectionDAGISel.h" #include "llvm/CodeGen/ValueTypes.h" #include "llvm/Target/TargetOptions.h" #include "llvm/Target/TargetLoweringObjectFile.h" #include "llvm/Support/Debug.h" #include "llvm/Support/raw_ostream.h" #include "llvm/ADT/VectorExtras.h" using namespace llvm; SystemZTargetLowering::SystemZTargetLowering(SystemZTargetMachine &tm) : TargetLowering(tm, new TargetLoweringObjectFileELF()), Subtarget(*tm.getSubtargetImpl()), TM(tm) { RegInfo = TM.getRegisterInfo(); // Set up the register classes. addRegisterClass(MVT::i32, SystemZ::GR32RegisterClass); addRegisterClass(MVT::i64, SystemZ::GR64RegisterClass); addRegisterClass(MVT::v2i32,SystemZ::GR64PRegisterClass); addRegisterClass(MVT::v2i64,SystemZ::GR128RegisterClass); if (!UseSoftFloat) { addRegisterClass(MVT::f32, SystemZ::FP32RegisterClass); addRegisterClass(MVT::f64, SystemZ::FP64RegisterClass); addLegalFPImmediate(APFloat(+0.0)); // lzer addLegalFPImmediate(APFloat(+0.0f)); // lzdr addLegalFPImmediate(APFloat(-0.0)); // lzer + lner addLegalFPImmediate(APFloat(-0.0f)); // lzdr + lndr } // Compute derived properties from the register classes computeRegisterProperties(); // Set shifts properties setShiftAmountType(MVT::i64); // Provide all sorts of operation actions setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Promote); setLoadExtAction(ISD::ZEXTLOAD, MVT::i1, Promote); setLoadExtAction(ISD::EXTLOAD, MVT::i1, Promote); setLoadExtAction(ISD::SEXTLOAD, MVT::f32, Expand); setLoadExtAction(ISD::ZEXTLOAD, MVT::f32, Expand); setLoadExtAction(ISD::EXTLOAD, MVT::f32, Expand); setLoadExtAction(ISD::SEXTLOAD, MVT::f64, Expand); setLoadExtAction(ISD::ZEXTLOAD, MVT::f64, Expand); setLoadExtAction(ISD::EXTLOAD, MVT::f64, Expand); setStackPointerRegisterToSaveRestore(SystemZ::R15D); setSchedulingPreference(SchedulingForLatency); setBooleanContents(ZeroOrOneBooleanContent); setOperationAction(ISD::BR_JT, MVT::Other, Expand); setOperationAction(ISD::BRCOND, MVT::Other, Expand); setOperationAction(ISD::BR_CC, MVT::i32, Custom); setOperationAction(ISD::BR_CC, MVT::i64, Custom); setOperationAction(ISD::BR_CC, MVT::f32, Custom); setOperationAction(ISD::BR_CC, MVT::f64, Custom); setOperationAction(ISD::ConstantPool, MVT::i32, Custom); setOperationAction(ISD::ConstantPool, MVT::i64, Custom); setOperationAction(ISD::GlobalAddress, MVT::i64, Custom); setOperationAction(ISD::JumpTable, MVT::i64, Custom); setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64, Expand); setOperationAction(ISD::SDIV, MVT::i32, Expand); setOperationAction(ISD::UDIV, MVT::i32, Expand); setOperationAction(ISD::SDIV, MVT::i64, Expand); setOperationAction(ISD::UDIV, MVT::i64, Expand); setOperationAction(ISD::SREM, MVT::i32, Expand); setOperationAction(ISD::UREM, MVT::i32, Expand); setOperationAction(ISD::SREM, MVT::i64, Expand); setOperationAction(ISD::UREM, MVT::i64, Expand); setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand); setOperationAction(ISD::CTPOP, MVT::i32, Expand); setOperationAction(ISD::CTPOP, MVT::i64, Expand); setOperationAction(ISD::CTTZ, MVT::i32, Expand); setOperationAction(ISD::CTTZ, MVT::i64, Expand); setOperationAction(ISD::CTLZ, MVT::i32, Promote); setOperationAction(ISD::CTLZ, MVT::i64, Legal); // FIXME: Can we lower these 2 efficiently? setOperationAction(ISD::SETCC, MVT::i32, Expand); setOperationAction(ISD::SETCC, MVT::i64, Expand); setOperationAction(ISD::SETCC, MVT::f32, Expand); setOperationAction(ISD::SETCC, MVT::f64, Expand); setOperationAction(ISD::SELECT, MVT::i32, Expand); setOperationAction(ISD::SELECT, MVT::i64, Expand); setOperationAction(ISD::SELECT, MVT::f32, Expand); setOperationAction(ISD::SELECT, MVT::f64, Expand); setOperationAction(ISD::SELECT_CC, MVT::i32, Custom); setOperationAction(ISD::SELECT_CC, MVT::i64, Custom); setOperationAction(ISD::SELECT_CC, MVT::f32, Custom); setOperationAction(ISD::SELECT_CC, MVT::f64, Custom); setOperationAction(ISD::MULHS, MVT::i64, Expand); setOperationAction(ISD::SMUL_LOHI, MVT::i64, Expand); // FIXME: Can we support these natively? setOperationAction(ISD::UMUL_LOHI, MVT::i64, Expand); setOperationAction(ISD::SRL_PARTS, MVT::i64, Expand); setOperationAction(ISD::SHL_PARTS, MVT::i64, Expand); setOperationAction(ISD::SRA_PARTS, MVT::i64, Expand); // Lower some FP stuff setOperationAction(ISD::FSIN, MVT::f32, Expand); setOperationAction(ISD::FSIN, MVT::f64, Expand); setOperationAction(ISD::FCOS, MVT::f32, Expand); setOperationAction(ISD::FCOS, MVT::f64, Expand); setOperationAction(ISD::FREM, MVT::f32, Expand); setOperationAction(ISD::FREM, MVT::f64, Expand); // We have only 64-bit bitconverts setOperationAction(ISD::BIT_CONVERT, MVT::f32, Expand); setOperationAction(ISD::BIT_CONVERT, MVT::i32, Expand); setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand); setOperationAction(ISD::UINT_TO_FP, MVT::i64, Expand); setOperationAction(ISD::FP_TO_UINT, MVT::i32, Expand); setOperationAction(ISD::FP_TO_UINT, MVT::i64, Expand); setTruncStoreAction(MVT::f64, MVT::f32, Expand); } SDValue SystemZTargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) { switch (Op.getOpcode()) { case ISD::BR_CC: return LowerBR_CC(Op, DAG); case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG); case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG); case ISD::JumpTable: return LowerJumpTable(Op, DAG); case ISD::ConstantPool: return LowerConstantPool(Op, DAG); default: llvm_unreachable("Should not custom lower this!"); return SDValue(); } } //===----------------------------------------------------------------------===// // SystemZ Inline Assembly Support //===----------------------------------------------------------------------===// /// getConstraintType - Given a constraint letter, return the type of /// constraint it is for this target. TargetLowering::ConstraintType SystemZTargetLowering::getConstraintType(const std::string &Constraint) const { if (Constraint.size() == 1) { switch (Constraint[0]) { case 'r': return C_RegisterClass; default: break; } } return TargetLowering::getConstraintType(Constraint); } std::pair SystemZTargetLowering:: getRegForInlineAsmConstraint(const std::string &Constraint, EVT VT) const { if (Constraint.size() == 1) { // GCC Constraint Letters switch (Constraint[0]) { default: break; case 'r': // GENERAL_REGS if (VT == MVT::i32) return std::make_pair(0U, SystemZ::GR32RegisterClass); else if (VT == MVT::i128) return std::make_pair(0U, SystemZ::GR128RegisterClass); return std::make_pair(0U, SystemZ::GR64RegisterClass); } } return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT); } //===----------------------------------------------------------------------===// // Calling Convention Implementation //===----------------------------------------------------------------------===// #include "SystemZGenCallingConv.inc" SDValue SystemZTargetLowering::LowerFormalArguments(SDValue Chain, CallingConv::ID CallConv, bool isVarArg, const SmallVectorImpl &Ins, DebugLoc dl, SelectionDAG &DAG, SmallVectorImpl &InVals) { switch (CallConv) { default: llvm_unreachable("Unsupported calling convention"); case CallingConv::C: case CallingConv::Fast: return LowerCCCArguments(Chain, CallConv, isVarArg, Ins, dl, DAG, InVals); } } SDValue SystemZTargetLowering::LowerCall(SDValue Chain, SDValue Callee, CallingConv::ID CallConv, bool isVarArg, bool isTailCall, const SmallVectorImpl &Outs, const SmallVectorImpl &Ins, DebugLoc dl, SelectionDAG &DAG, SmallVectorImpl &InVals) { switch (CallConv) { default: llvm_unreachable("Unsupported calling convention"); case CallingConv::Fast: case CallingConv::C: return LowerCCCCallTo(Chain, Callee, CallConv, isVarArg, isTailCall, Outs, Ins, dl, DAG, InVals); } } /// LowerCCCArguments - transform physical registers into virtual registers and /// generate load operations for arguments places on the stack. // FIXME: struct return stuff // FIXME: varargs SDValue SystemZTargetLowering::LowerCCCArguments(SDValue Chain, CallingConv::ID CallConv, bool isVarArg, const SmallVectorImpl &Ins, DebugLoc dl, SelectionDAG &DAG, SmallVectorImpl &InVals) { MachineFunction &MF = DAG.getMachineFunction(); MachineFrameInfo *MFI = MF.getFrameInfo(); MachineRegisterInfo &RegInfo = MF.getRegInfo(); // Assign locations to all of the incoming arguments. SmallVector ArgLocs; CCState CCInfo(CallConv, isVarArg, getTargetMachine(), ArgLocs, *DAG.getContext()); CCInfo.AnalyzeFormalArguments(Ins, CC_SystemZ); if (isVarArg) llvm_report_error("Varargs not supported yet"); for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) { SDValue ArgValue; CCValAssign &VA = ArgLocs[i]; EVT LocVT = VA.getLocVT(); if (VA.isRegLoc()) { // Arguments passed in registers TargetRegisterClass *RC; switch (LocVT.getSimpleVT().SimpleTy) { default: #ifndef NDEBUG errs() << "LowerFormalArguments Unhandled argument type: " << LocVT.getSimpleVT().SimpleTy << "\n"; #endif llvm_unreachable(0); case MVT::i64: RC = SystemZ::GR64RegisterClass; break; case MVT::f32: RC = SystemZ::FP32RegisterClass; break; case MVT::f64: RC = SystemZ::FP64RegisterClass; break; } unsigned VReg = RegInfo.createVirtualRegister(RC); RegInfo.addLiveIn(VA.getLocReg(), VReg); ArgValue = DAG.getCopyFromReg(Chain, dl, VReg, LocVT); } else { // Sanity check assert(VA.isMemLoc()); // Create the nodes corresponding to a load from this parameter slot. // Create the frame index object for this incoming parameter... int FI = MFI->CreateFixedObject(LocVT.getSizeInBits()/8, VA.getLocMemOffset()); // Create the SelectionDAG nodes corresponding to a load // from this parameter SDValue FIN = DAG.getFrameIndex(FI, getPointerTy()); ArgValue = DAG.getLoad(LocVT, dl, Chain, FIN, PseudoSourceValue::getFixedStack(FI), 0); } // If this is an 8/16/32-bit value, it is really passed promoted to 64 // bits. Insert an assert[sz]ext to capture this, then truncate to the // right size. if (VA.getLocInfo() == CCValAssign::SExt) ArgValue = DAG.getNode(ISD::AssertSext, dl, LocVT, ArgValue, DAG.getValueType(VA.getValVT())); else if (VA.getLocInfo() == CCValAssign::ZExt) ArgValue = DAG.getNode(ISD::AssertZext, dl, LocVT, ArgValue, DAG.getValueType(VA.getValVT())); if (VA.getLocInfo() != CCValAssign::Full) ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue); InVals.push_back(ArgValue); } return Chain; } /// LowerCCCCallTo - functions arguments are copied from virtual regs to /// (physical regs)/(stack frame), CALLSEQ_START and CALLSEQ_END are emitted. /// TODO: sret. SDValue SystemZTargetLowering::LowerCCCCallTo(SDValue Chain, SDValue Callee, CallingConv::ID CallConv, bool isVarArg, bool isTailCall, const SmallVectorImpl &Outs, const SmallVectorImpl &Ins, DebugLoc dl, SelectionDAG &DAG, SmallVectorImpl &InVals) { MachineFunction &MF = DAG.getMachineFunction(); // Offset to first argument stack slot. const unsigned FirstArgOffset = 160; // Analyze operands of the call, assigning locations to each operand. SmallVector ArgLocs; CCState CCInfo(CallConv, isVarArg, getTargetMachine(), ArgLocs, *DAG.getContext()); CCInfo.AnalyzeCallOperands(Outs, CC_SystemZ); // Get a count of how many bytes are to be pushed on the stack. unsigned NumBytes = CCInfo.getNextStackOffset(); Chain = DAG.getCALLSEQ_START(Chain ,DAG.getConstant(NumBytes, getPointerTy(), true)); SmallVector, 4> RegsToPass; SmallVector MemOpChains; SDValue StackPtr; // Walk the register/memloc assignments, inserting copies/loads. for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) { CCValAssign &VA = ArgLocs[i]; SDValue Arg = Outs[i].Val; // Promote the value if needed. switch (VA.getLocInfo()) { default: assert(0 && "Unknown loc info!"); case CCValAssign::Full: break; case CCValAssign::SExt: Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg); break; case CCValAssign::ZExt: Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg); break; case CCValAssign::AExt: Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg); break; } // Arguments that can be passed on register must be kept at RegsToPass // vector if (VA.isRegLoc()) { RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg)); } else { assert(VA.isMemLoc()); if (StackPtr.getNode() == 0) StackPtr = DAG.getCopyFromReg(Chain, dl, (RegInfo->hasFP(MF) ? SystemZ::R11D : SystemZ::R15D), getPointerTy()); unsigned Offset = FirstArgOffset + VA.getLocMemOffset(); SDValue PtrOff = DAG.getNode(ISD::ADD, dl, getPointerTy(), StackPtr, DAG.getIntPtrConstant(Offset)); MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff, PseudoSourceValue::getStack(), Offset)); } } // Transform all store nodes into one single node because all store nodes are // independent of each other. if (!MemOpChains.empty()) Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &MemOpChains[0], MemOpChains.size()); // Build a sequence of copy-to-reg nodes chained together with token chain and // flag operands which copy the outgoing args into registers. The InFlag in // necessary since all emited instructions must be stuck together. SDValue InFlag; for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) { Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first, RegsToPass[i].second, InFlag); InFlag = Chain.getValue(1); } // If the callee is a GlobalAddress node (quite common, every direct call is) // turn it into a TargetGlobalAddress node so that legalize doesn't hack it. // Likewise ExternalSymbol -> TargetExternalSymbol. if (GlobalAddressSDNode *G = dyn_cast(Callee)) Callee = DAG.getTargetGlobalAddress(G->getGlobal(), getPointerTy()); else if (ExternalSymbolSDNode *E = dyn_cast(Callee)) Callee = DAG.getTargetExternalSymbol(E->getSymbol(), getPointerTy()); // Returns a chain & a flag for retval copy to use. SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Flag); SmallVector Ops; Ops.push_back(Chain); Ops.push_back(Callee); // Add argument registers to the end of the list so that they are // known live into the call. for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) Ops.push_back(DAG.getRegister(RegsToPass[i].first, RegsToPass[i].second.getValueType())); if (InFlag.getNode()) Ops.push_back(InFlag); Chain = DAG.getNode(SystemZISD::CALL, dl, NodeTys, &Ops[0], Ops.size()); InFlag = Chain.getValue(1); // Create the CALLSEQ_END node. Chain = DAG.getCALLSEQ_END(Chain, DAG.getConstant(NumBytes, getPointerTy(), true), DAG.getConstant(0, getPointerTy(), true), InFlag); InFlag = Chain.getValue(1); // Handle result values, copying them out of physregs into vregs that we // return. return LowerCallResult(Chain, InFlag, CallConv, isVarArg, Ins, dl, DAG, InVals); } /// LowerCallResult - Lower the result values of a call into the /// appropriate copies out of appropriate physical registers. /// SDValue SystemZTargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag, CallingConv::ID CallConv, bool isVarArg, const SmallVectorImpl &Ins, DebugLoc dl, SelectionDAG &DAG, SmallVectorImpl &InVals) { // Assign locations to each value returned by this call. SmallVector RVLocs; CCState CCInfo(CallConv, isVarArg, getTargetMachine(), RVLocs, *DAG.getContext()); CCInfo.AnalyzeCallResult(Ins, RetCC_SystemZ); // Copy all of the result registers out of their specified physreg. for (unsigned i = 0; i != RVLocs.size(); ++i) { CCValAssign &VA = RVLocs[i]; Chain = DAG.getCopyFromReg(Chain, dl, VA.getLocReg(), VA.getLocVT(), InFlag).getValue(1); SDValue RetValue = Chain.getValue(0); InFlag = Chain.getValue(2); // If this is an 8/16/32-bit value, it is really passed promoted to 64 // bits. Insert an assert[sz]ext to capture this, then truncate to the // right size. if (VA.getLocInfo() == CCValAssign::SExt) RetValue = DAG.getNode(ISD::AssertSext, dl, VA.getLocVT(), RetValue, DAG.getValueType(VA.getValVT())); else if (VA.getLocInfo() == CCValAssign::ZExt) RetValue = DAG.getNode(ISD::AssertZext, dl, VA.getLocVT(), RetValue, DAG.getValueType(VA.getValVT())); if (VA.getLocInfo() != CCValAssign::Full) RetValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), RetValue); InVals.push_back(RetValue); } return Chain; } SDValue SystemZTargetLowering::LowerReturn(SDValue Chain, CallingConv::ID CallConv, bool isVarArg, const SmallVectorImpl &Outs, DebugLoc dl, SelectionDAG &DAG) { // CCValAssign - represent the assignment of the return value to a location SmallVector RVLocs; // CCState - Info about the registers and stack slot. CCState CCInfo(CallConv, isVarArg, getTargetMachine(), RVLocs, *DAG.getContext()); // Analize return values. CCInfo.AnalyzeReturn(Outs, RetCC_SystemZ); // If this is the first return lowered for this function, add the regs to the // liveout set for the function. if (DAG.getMachineFunction().getRegInfo().liveout_empty()) { for (unsigned i = 0; i != RVLocs.size(); ++i) if (RVLocs[i].isRegLoc()) DAG.getMachineFunction().getRegInfo().addLiveOut(RVLocs[i].getLocReg()); } SDValue Flag; // Copy the result values into the output registers. for (unsigned i = 0; i != RVLocs.size(); ++i) { CCValAssign &VA = RVLocs[i]; SDValue ResValue = Outs[i].Val; assert(VA.isRegLoc() && "Can only return in registers!"); // If this is an 8/16/32-bit value, it is really should be passed promoted // to 64 bits. if (VA.getLocInfo() == CCValAssign::SExt) ResValue = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), ResValue); else if (VA.getLocInfo() == CCValAssign::ZExt) ResValue = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), ResValue); else if (VA.getLocInfo() == CCValAssign::AExt) ResValue = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), ResValue); Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), ResValue, Flag); // Guarantee that all emitted copies are stuck together, // avoiding something bad. Flag = Chain.getValue(1); } if (Flag.getNode()) return DAG.getNode(SystemZISD::RET_FLAG, dl, MVT::Other, Chain, Flag); // Return Void return DAG.getNode(SystemZISD::RET_FLAG, dl, MVT::Other, Chain); } SDValue SystemZTargetLowering::EmitCmp(SDValue LHS, SDValue RHS, ISD::CondCode CC, SDValue &SystemZCC, SelectionDAG &DAG) { // FIXME: Emit a test if RHS is zero bool isUnsigned = false; SystemZCC::CondCodes TCC; switch (CC) { default: llvm_unreachable("Invalid integer condition!"); case ISD::SETEQ: case ISD::SETOEQ: TCC = SystemZCC::E; break; case ISD::SETUEQ: TCC = SystemZCC::NLH; break; case ISD::SETNE: case ISD::SETONE: TCC = SystemZCC::NE; break; case ISD::SETUNE: TCC = SystemZCC::LH; break; case ISD::SETO: TCC = SystemZCC::O; break; case ISD::SETUO: TCC = SystemZCC::NO; break; case ISD::SETULE: if (LHS.getValueType().isFloatingPoint()) { TCC = SystemZCC::NH; break; } isUnsigned = true; // FALLTHROUGH case ISD::SETLE: case ISD::SETOLE: TCC = SystemZCC::LE; break; case ISD::SETUGE: if (LHS.getValueType().isFloatingPoint()) { TCC = SystemZCC::NL; break; } isUnsigned = true; // FALLTHROUGH case ISD::SETGE: case ISD::SETOGE: TCC = SystemZCC::HE; break; case ISD::SETUGT: if (LHS.getValueType().isFloatingPoint()) { TCC = SystemZCC::NLE; break; } isUnsigned = true; // FALLTHROUGH case ISD::SETGT: case ISD::SETOGT: TCC = SystemZCC::H; break; case ISD::SETULT: if (LHS.getValueType().isFloatingPoint()) { TCC = SystemZCC::NHE; break; } isUnsigned = true; // FALLTHROUGH case ISD::SETLT: case ISD::SETOLT: TCC = SystemZCC::L; break; } SystemZCC = DAG.getConstant(TCC, MVT::i32); DebugLoc dl = LHS.getDebugLoc(); return DAG.getNode((isUnsigned ? SystemZISD::UCMP : SystemZISD::CMP), dl, MVT::Flag, LHS, RHS); } SDValue SystemZTargetLowering::LowerBR_CC(SDValue Op, SelectionDAG &DAG) { SDValue Chain = Op.getOperand(0); ISD::CondCode CC = cast(Op.getOperand(1))->get(); SDValue LHS = Op.getOperand(2); SDValue RHS = Op.getOperand(3); SDValue Dest = Op.getOperand(4); DebugLoc dl = Op.getDebugLoc(); SDValue SystemZCC; SDValue Flag = EmitCmp(LHS, RHS, CC, SystemZCC, DAG); return DAG.getNode(SystemZISD::BRCOND, dl, Op.getValueType(), Chain, Dest, SystemZCC, Flag); } SDValue SystemZTargetLowering::LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) { SDValue LHS = Op.getOperand(0); SDValue RHS = Op.getOperand(1); SDValue TrueV = Op.getOperand(2); SDValue FalseV = Op.getOperand(3); ISD::CondCode CC = cast(Op.getOperand(4))->get(); DebugLoc dl = Op.getDebugLoc(); SDValue SystemZCC; SDValue Flag = EmitCmp(LHS, RHS, CC, SystemZCC, DAG); SDVTList VTs = DAG.getVTList(Op.getValueType(), MVT::Flag); SmallVector Ops; Ops.push_back(TrueV); Ops.push_back(FalseV); Ops.push_back(SystemZCC); Ops.push_back(Flag); return DAG.getNode(SystemZISD::SELECT, dl, VTs, &Ops[0], Ops.size()); } SDValue SystemZTargetLowering::LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) { DebugLoc dl = Op.getDebugLoc(); GlobalValue *GV = cast(Op)->getGlobal(); int64_t Offset = cast(Op)->getOffset(); bool IsPic = getTargetMachine().getRelocationModel() == Reloc::PIC_; bool ExtraLoadRequired = Subtarget.GVRequiresExtraLoad(GV, getTargetMachine(), false); SDValue Result; if (!IsPic && !ExtraLoadRequired) { Result = DAG.getTargetGlobalAddress(GV, getPointerTy(), Offset); Offset = 0; } else { unsigned char OpFlags = 0; if (ExtraLoadRequired) OpFlags = SystemZII::MO_GOTENT; Result = DAG.getTargetGlobalAddress(GV, getPointerTy(), 0, OpFlags); } Result = DAG.getNode(SystemZISD::PCRelativeWrapper, dl, getPointerTy(), Result); if (ExtraLoadRequired) Result = DAG.getLoad(getPointerTy(), dl, DAG.getEntryNode(), Result, PseudoSourceValue::getGOT(), 0); // If there was a non-zero offset that we didn't fold, create an explicit // addition for it. if (Offset != 0) Result = DAG.getNode(ISD::ADD, dl, getPointerTy(), Result, DAG.getConstant(Offset, getPointerTy())); return Result; } // FIXME: PIC here SDValue SystemZTargetLowering::LowerJumpTable(SDValue Op, SelectionDAG &DAG) { DebugLoc dl = Op.getDebugLoc(); JumpTableSDNode *JT = cast(Op); SDValue Result = DAG.getTargetJumpTable(JT->getIndex(), getPointerTy()); return DAG.getNode(SystemZISD::PCRelativeWrapper, dl, getPointerTy(), Result); } // FIXME: PIC here // FIXME: This is just dirty hack. We need to lower cpool properly SDValue SystemZTargetLowering::LowerConstantPool(SDValue Op, SelectionDAG &DAG) { DebugLoc dl = Op.getDebugLoc(); ConstantPoolSDNode *CP = cast(Op); SDValue Result = DAG.getTargetConstantPool(CP->getConstVal(), getPointerTy(), CP->getAlignment(), CP->getOffset()); return DAG.getNode(SystemZISD::PCRelativeWrapper, dl, getPointerTy(), Result); } const char *SystemZTargetLowering::getTargetNodeName(unsigned Opcode) const { switch (Opcode) { case SystemZISD::RET_FLAG: return "SystemZISD::RET_FLAG"; case SystemZISD::CALL: return "SystemZISD::CALL"; case SystemZISD::BRCOND: return "SystemZISD::BRCOND"; case SystemZISD::CMP: return "SystemZISD::CMP"; case SystemZISD::UCMP: return "SystemZISD::UCMP"; case SystemZISD::SELECT: return "SystemZISD::SELECT"; case SystemZISD::PCRelativeWrapper: return "SystemZISD::PCRelativeWrapper"; default: return NULL; } } //===----------------------------------------------------------------------===// // Other Lowering Code //===----------------------------------------------------------------------===// MachineBasicBlock* SystemZTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI, MachineBasicBlock *BB) const { const SystemZInstrInfo &TII = *TM.getInstrInfo(); DebugLoc dl = MI->getDebugLoc(); assert((MI->getOpcode() == SystemZ::Select32 || MI->getOpcode() == SystemZ::SelectF32 || MI->getOpcode() == SystemZ::Select64 || MI->getOpcode() == SystemZ::SelectF64) && "Unexpected instr type to insert"); // To "insert" a SELECT instruction, we actually have to insert the diamond // control-flow pattern. The incoming instruction knows the destination vreg // to set, the condition code register to branch on, the true/false values to // select between, and a branch opcode to use. const BasicBlock *LLVM_BB = BB->getBasicBlock(); MachineFunction::iterator I = BB; ++I; // thisMBB: // ... // TrueVal = ... // cmpTY ccX, r1, r2 // jCC copy1MBB // fallthrough --> copy0MBB MachineBasicBlock *thisMBB = BB; MachineFunction *F = BB->getParent(); MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB); MachineBasicBlock *copy1MBB = F->CreateMachineBasicBlock(LLVM_BB); SystemZCC::CondCodes CC = (SystemZCC::CondCodes)MI->getOperand(3).getImm(); BuildMI(BB, dl, TII.getBrCond(CC)).addMBB(copy1MBB); F->insert(I, copy0MBB); F->insert(I, copy1MBB); // Update machine-CFG edges by transferring all successors of the current // block to the new block which will contain the Phi node for the select. copy1MBB->transferSuccessors(BB); // Next, add the true and fallthrough blocks as its successors. BB->addSuccessor(copy0MBB); BB->addSuccessor(copy1MBB); // copy0MBB: // %FalseValue = ... // # fallthrough to copy1MBB BB = copy0MBB; // Update machine-CFG edges BB->addSuccessor(copy1MBB); // copy1MBB: // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ] // ... BB = copy1MBB; BuildMI(BB, dl, TII.get(SystemZ::PHI), MI->getOperand(0).getReg()) .addReg(MI->getOperand(2).getReg()).addMBB(copy0MBB) .addReg(MI->getOperand(1).getReg()).addMBB(thisMBB); F->DeleteMachineInstr(MI); // The pseudo instruction is gone now. return BB; }