| //===-- XCoreISelLowering.cpp - XCore 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 XCoreTargetLowering class. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #define DEBUG_TYPE "xcore-lower" |
| |
| #include "XCoreISelLowering.h" |
| #include "XCoreMachineFunctionInfo.h" |
| #include "XCore.h" |
| #include "XCoreTargetObjectFile.h" |
| #include "XCoreTargetMachine.h" |
| #include "XCoreSubtarget.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/MachineJumpTableInfo.h" |
| #include "llvm/CodeGen/MachineRegisterInfo.h" |
| #include "llvm/CodeGen/SelectionDAGISel.h" |
| #include "llvm/CodeGen/ValueTypes.h" |
| #include "llvm/Support/Debug.h" |
| #include "llvm/Support/ErrorHandling.h" |
| #include "llvm/Support/raw_ostream.h" |
| #include "llvm/ADT/VectorExtras.h" |
| using namespace llvm; |
| |
| const char *XCoreTargetLowering:: |
| getTargetNodeName(unsigned Opcode) const |
| { |
| switch (Opcode) |
| { |
| case XCoreISD::BL : return "XCoreISD::BL"; |
| case XCoreISD::PCRelativeWrapper : return "XCoreISD::PCRelativeWrapper"; |
| case XCoreISD::DPRelativeWrapper : return "XCoreISD::DPRelativeWrapper"; |
| case XCoreISD::CPRelativeWrapper : return "XCoreISD::CPRelativeWrapper"; |
| case XCoreISD::STWSP : return "XCoreISD::STWSP"; |
| case XCoreISD::RETSP : return "XCoreISD::RETSP"; |
| case XCoreISD::LADD : return "XCoreISD::LADD"; |
| case XCoreISD::LSUB : return "XCoreISD::LSUB"; |
| case XCoreISD::LMUL : return "XCoreISD::LMUL"; |
| case XCoreISD::MACCU : return "XCoreISD::MACCU"; |
| case XCoreISD::MACCS : return "XCoreISD::MACCS"; |
| case XCoreISD::BR_JT : return "XCoreISD::BR_JT"; |
| case XCoreISD::BR_JT32 : return "XCoreISD::BR_JT32"; |
| default : return NULL; |
| } |
| } |
| |
| XCoreTargetLowering::XCoreTargetLowering(XCoreTargetMachine &XTM) |
| : TargetLowering(XTM, new XCoreTargetObjectFile()), |
| TM(XTM), |
| Subtarget(*XTM.getSubtargetImpl()) { |
| |
| // Set up the register classes. |
| addRegisterClass(MVT::i32, XCore::GRRegsRegisterClass); |
| |
| // Compute derived properties from the register classes |
| computeRegisterProperties(); |
| |
| // Division is expensive |
| setIntDivIsCheap(false); |
| |
| setStackPointerRegisterToSaveRestore(XCore::SP); |
| |
| setSchedulingPreference(Sched::RegPressure); |
| |
| // Use i32 for setcc operations results (slt, sgt, ...). |
| setBooleanContents(ZeroOrOneBooleanContent); |
| setBooleanVectorContents(ZeroOrOneBooleanContent); // FIXME: Is this correct? |
| |
| // XCore does not have the NodeTypes below. |
| setOperationAction(ISD::BR_CC, MVT::Other, Expand); |
| setOperationAction(ISD::SELECT_CC, MVT::i32, Custom); |
| setOperationAction(ISD::ADDC, MVT::i32, Expand); |
| setOperationAction(ISD::ADDE, MVT::i32, Expand); |
| setOperationAction(ISD::SUBC, MVT::i32, Expand); |
| setOperationAction(ISD::SUBE, MVT::i32, Expand); |
| |
| // Stop the combiner recombining select and set_cc |
| setOperationAction(ISD::SELECT_CC, MVT::Other, Expand); |
| |
| // 64bit |
| setOperationAction(ISD::ADD, MVT::i64, Custom); |
| setOperationAction(ISD::SUB, MVT::i64, Custom); |
| setOperationAction(ISD::SMUL_LOHI, MVT::i32, Custom); |
| setOperationAction(ISD::UMUL_LOHI, MVT::i32, Custom); |
| setOperationAction(ISD::MULHS, MVT::i32, Expand); |
| setOperationAction(ISD::MULHU, MVT::i32, Expand); |
| setOperationAction(ISD::SHL_PARTS, MVT::i32, Expand); |
| setOperationAction(ISD::SRA_PARTS, MVT::i32, Expand); |
| setOperationAction(ISD::SRL_PARTS, MVT::i32, Expand); |
| |
| // Bit Manipulation |
| setOperationAction(ISD::CTPOP, MVT::i32, Expand); |
| setOperationAction(ISD::ROTL , MVT::i32, Expand); |
| setOperationAction(ISD::ROTR , MVT::i32, Expand); |
| |
| setOperationAction(ISD::TRAP, MVT::Other, Legal); |
| |
| // Jump tables. |
| setOperationAction(ISD::BR_JT, MVT::Other, Custom); |
| |
| setOperationAction(ISD::GlobalAddress, MVT::i32, Custom); |
| setOperationAction(ISD::BlockAddress, MVT::i32 , Custom); |
| |
| // Thread Local Storage |
| setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom); |
| |
| // Conversion of i64 -> double produces constantpool nodes |
| setOperationAction(ISD::ConstantPool, MVT::i32, Custom); |
| |
| // Loads |
| setLoadExtAction(ISD::EXTLOAD, MVT::i1, Promote); |
| setLoadExtAction(ISD::ZEXTLOAD, MVT::i1, Promote); |
| setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Promote); |
| |
| setLoadExtAction(ISD::SEXTLOAD, MVT::i8, Expand); |
| setLoadExtAction(ISD::ZEXTLOAD, MVT::i16, Expand); |
| |
| // Custom expand misaligned loads / stores. |
| setOperationAction(ISD::LOAD, MVT::i32, Custom); |
| setOperationAction(ISD::STORE, MVT::i32, Custom); |
| |
| // Varargs |
| setOperationAction(ISD::VAEND, MVT::Other, Expand); |
| setOperationAction(ISD::VACOPY, MVT::Other, Expand); |
| setOperationAction(ISD::VAARG, MVT::Other, Custom); |
| setOperationAction(ISD::VASTART, MVT::Other, Custom); |
| |
| // Dynamic stack |
| setOperationAction(ISD::STACKSAVE, MVT::Other, Expand); |
| setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand); |
| setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32, Expand); |
| |
| // TRAMPOLINE is custom lowered. |
| setOperationAction(ISD::INIT_TRAMPOLINE, MVT::Other, Custom); |
| setOperationAction(ISD::ADJUST_TRAMPOLINE, MVT::Other, Custom); |
| |
| maxStoresPerMemset = maxStoresPerMemsetOptSize = 4; |
| maxStoresPerMemmove = maxStoresPerMemmoveOptSize |
| = maxStoresPerMemcpy = maxStoresPerMemcpyOptSize = 2; |
| |
| // We have target-specific dag combine patterns for the following nodes: |
| setTargetDAGCombine(ISD::STORE); |
| setTargetDAGCombine(ISD::ADD); |
| |
| setMinFunctionAlignment(1); |
| } |
| |
| SDValue XCoreTargetLowering:: |
| LowerOperation(SDValue Op, SelectionDAG &DAG) const { |
| switch (Op.getOpcode()) |
| { |
| case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG); |
| case ISD::GlobalTLSAddress: return LowerGlobalTLSAddress(Op, DAG); |
| case ISD::BlockAddress: return LowerBlockAddress(Op, DAG); |
| case ISD::ConstantPool: return LowerConstantPool(Op, DAG); |
| case ISD::BR_JT: return LowerBR_JT(Op, DAG); |
| case ISD::LOAD: return LowerLOAD(Op, DAG); |
| case ISD::STORE: return LowerSTORE(Op, DAG); |
| case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG); |
| case ISD::VAARG: return LowerVAARG(Op, DAG); |
| case ISD::VASTART: return LowerVASTART(Op, DAG); |
| case ISD::SMUL_LOHI: return LowerSMUL_LOHI(Op, DAG); |
| case ISD::UMUL_LOHI: return LowerUMUL_LOHI(Op, DAG); |
| // FIXME: Remove these when LegalizeDAGTypes lands. |
| case ISD::ADD: |
| case ISD::SUB: return ExpandADDSUB(Op.getNode(), DAG); |
| case ISD::FRAMEADDR: return LowerFRAMEADDR(Op, DAG); |
| case ISD::INIT_TRAMPOLINE: return LowerINIT_TRAMPOLINE(Op, DAG); |
| case ISD::ADJUST_TRAMPOLINE: return LowerADJUST_TRAMPOLINE(Op, DAG); |
| default: |
| llvm_unreachable("unimplemented operand"); |
| return SDValue(); |
| } |
| } |
| |
| /// ReplaceNodeResults - Replace the results of node with an illegal result |
| /// type with new values built out of custom code. |
| void XCoreTargetLowering::ReplaceNodeResults(SDNode *N, |
| SmallVectorImpl<SDValue>&Results, |
| SelectionDAG &DAG) const { |
| switch (N->getOpcode()) { |
| default: |
| llvm_unreachable("Don't know how to custom expand this!"); |
| return; |
| case ISD::ADD: |
| case ISD::SUB: |
| Results.push_back(ExpandADDSUB(N, DAG)); |
| return; |
| } |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // Misc Lower Operation implementation |
| //===----------------------------------------------------------------------===// |
| |
| SDValue XCoreTargetLowering:: |
| LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const |
| { |
| DebugLoc dl = Op.getDebugLoc(); |
| SDValue Cond = DAG.getNode(ISD::SETCC, dl, MVT::i32, Op.getOperand(2), |
| Op.getOperand(3), Op.getOperand(4)); |
| return DAG.getNode(ISD::SELECT, dl, MVT::i32, Cond, Op.getOperand(0), |
| Op.getOperand(1)); |
| } |
| |
| SDValue XCoreTargetLowering:: |
| getGlobalAddressWrapper(SDValue GA, const GlobalValue *GV, |
| SelectionDAG &DAG) const |
| { |
| // FIXME there is no actual debug info here |
| DebugLoc dl = GA.getDebugLoc(); |
| if (isa<Function>(GV)) { |
| return DAG.getNode(XCoreISD::PCRelativeWrapper, dl, MVT::i32, GA); |
| } |
| const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV); |
| if (!GVar) { |
| // If GV is an alias then use the aliasee to determine constness |
| if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV)) |
| GVar = dyn_cast_or_null<GlobalVariable>(GA->resolveAliasedGlobal()); |
| } |
| bool isConst = GVar && GVar->isConstant(); |
| if (isConst) { |
| return DAG.getNode(XCoreISD::CPRelativeWrapper, dl, MVT::i32, GA); |
| } |
| return DAG.getNode(XCoreISD::DPRelativeWrapper, dl, MVT::i32, GA); |
| } |
| |
| SDValue XCoreTargetLowering:: |
| LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const |
| { |
| const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal(); |
| SDValue GA = DAG.getTargetGlobalAddress(GV, Op.getDebugLoc(), MVT::i32); |
| return getGlobalAddressWrapper(GA, GV, DAG); |
| } |
| |
| static inline SDValue BuildGetId(SelectionDAG &DAG, DebugLoc dl) { |
| return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, MVT::i32, |
| DAG.getConstant(Intrinsic::xcore_getid, MVT::i32)); |
| } |
| |
| static inline bool isZeroLengthArray(Type *Ty) { |
| ArrayType *AT = dyn_cast_or_null<ArrayType>(Ty); |
| return AT && (AT->getNumElements() == 0); |
| } |
| |
| SDValue XCoreTargetLowering:: |
| LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const |
| { |
| // FIXME there isn't really debug info here |
| DebugLoc dl = Op.getDebugLoc(); |
| // transform to label + getid() * size |
| const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal(); |
| SDValue GA = DAG.getTargetGlobalAddress(GV, dl, MVT::i32); |
| const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV); |
| if (!GVar) { |
| // If GV is an alias then use the aliasee to determine size |
| if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV)) |
| GVar = dyn_cast_or_null<GlobalVariable>(GA->resolveAliasedGlobal()); |
| } |
| if (! GVar) { |
| llvm_unreachable("Thread local object not a GlobalVariable?"); |
| return SDValue(); |
| } |
| Type *Ty = cast<PointerType>(GV->getType())->getElementType(); |
| if (!Ty->isSized() || isZeroLengthArray(Ty)) { |
| #ifndef NDEBUG |
| errs() << "Size of thread local object " << GVar->getName() |
| << " is unknown\n"; |
| #endif |
| llvm_unreachable(0); |
| } |
| SDValue base = getGlobalAddressWrapper(GA, GV, DAG); |
| const TargetData *TD = TM.getTargetData(); |
| unsigned Size = TD->getTypeAllocSize(Ty); |
| SDValue offset = DAG.getNode(ISD::MUL, dl, MVT::i32, BuildGetId(DAG, dl), |
| DAG.getConstant(Size, MVT::i32)); |
| return DAG.getNode(ISD::ADD, dl, MVT::i32, base, offset); |
| } |
| |
| SDValue XCoreTargetLowering:: |
| LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const |
| { |
| DebugLoc DL = Op.getDebugLoc(); |
| |
| const BlockAddress *BA = cast<BlockAddressSDNode>(Op)->getBlockAddress(); |
| SDValue Result = DAG.getBlockAddress(BA, getPointerTy(), /*isTarget=*/true); |
| |
| return DAG.getNode(XCoreISD::PCRelativeWrapper, DL, getPointerTy(), Result); |
| } |
| |
| SDValue XCoreTargetLowering:: |
| LowerConstantPool(SDValue Op, SelectionDAG &DAG) const |
| { |
| ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op); |
| // FIXME there isn't really debug info here |
| DebugLoc dl = CP->getDebugLoc(); |
| EVT PtrVT = Op.getValueType(); |
| SDValue Res; |
| if (CP->isMachineConstantPoolEntry()) { |
| Res = DAG.getTargetConstantPool(CP->getMachineCPVal(), PtrVT, |
| CP->getAlignment()); |
| } else { |
| Res = DAG.getTargetConstantPool(CP->getConstVal(), PtrVT, |
| CP->getAlignment()); |
| } |
| return DAG.getNode(XCoreISD::CPRelativeWrapper, dl, MVT::i32, Res); |
| } |
| |
| unsigned XCoreTargetLowering::getJumpTableEncoding() const { |
| return MachineJumpTableInfo::EK_Inline; |
| } |
| |
| SDValue XCoreTargetLowering:: |
| LowerBR_JT(SDValue Op, SelectionDAG &DAG) const |
| { |
| SDValue Chain = Op.getOperand(0); |
| SDValue Table = Op.getOperand(1); |
| SDValue Index = Op.getOperand(2); |
| DebugLoc dl = Op.getDebugLoc(); |
| JumpTableSDNode *JT = cast<JumpTableSDNode>(Table); |
| unsigned JTI = JT->getIndex(); |
| MachineFunction &MF = DAG.getMachineFunction(); |
| const MachineJumpTableInfo *MJTI = MF.getJumpTableInfo(); |
| SDValue TargetJT = DAG.getTargetJumpTable(JT->getIndex(), MVT::i32); |
| |
| unsigned NumEntries = MJTI->getJumpTables()[JTI].MBBs.size(); |
| if (NumEntries <= 32) { |
| return DAG.getNode(XCoreISD::BR_JT, dl, MVT::Other, Chain, TargetJT, Index); |
| } |
| assert((NumEntries >> 31) == 0); |
| SDValue ScaledIndex = DAG.getNode(ISD::SHL, dl, MVT::i32, Index, |
| DAG.getConstant(1, MVT::i32)); |
| return DAG.getNode(XCoreISD::BR_JT32, dl, MVT::Other, Chain, TargetJT, |
| ScaledIndex); |
| } |
| |
| static bool |
| IsWordAlignedBasePlusConstantOffset(SDValue Addr, SDValue &AlignedBase, |
| int64_t &Offset) |
| { |
| if (Addr.getOpcode() != ISD::ADD) { |
| return false; |
| } |
| ConstantSDNode *CN = 0; |
| if (!(CN = dyn_cast<ConstantSDNode>(Addr.getOperand(1)))) { |
| return false; |
| } |
| int64_t off = CN->getSExtValue(); |
| const SDValue &Base = Addr.getOperand(0); |
| const SDValue *Root = &Base; |
| if (Base.getOpcode() == ISD::ADD && |
| Base.getOperand(1).getOpcode() == ISD::SHL) { |
| ConstantSDNode *CN = dyn_cast<ConstantSDNode>(Base.getOperand(1) |
| .getOperand(1)); |
| if (CN && (CN->getSExtValue() >= 2)) { |
| Root = &Base.getOperand(0); |
| } |
| } |
| if (isa<FrameIndexSDNode>(*Root)) { |
| // All frame indicies are word aligned |
| AlignedBase = Base; |
| Offset = off; |
| return true; |
| } |
| if (Root->getOpcode() == XCoreISD::DPRelativeWrapper || |
| Root->getOpcode() == XCoreISD::CPRelativeWrapper) { |
| // All dp / cp relative addresses are word aligned |
| AlignedBase = Base; |
| Offset = off; |
| return true; |
| } |
| return false; |
| } |
| |
| SDValue XCoreTargetLowering:: |
| LowerLOAD(SDValue Op, SelectionDAG &DAG) const { |
| LoadSDNode *LD = cast<LoadSDNode>(Op); |
| assert(LD->getExtensionType() == ISD::NON_EXTLOAD && |
| "Unexpected extension type"); |
| assert(LD->getMemoryVT() == MVT::i32 && "Unexpected load EVT"); |
| if (allowsUnalignedMemoryAccesses(LD->getMemoryVT())) |
| return SDValue(); |
| |
| unsigned ABIAlignment = getTargetData()-> |
| getABITypeAlignment(LD->getMemoryVT().getTypeForEVT(*DAG.getContext())); |
| // Leave aligned load alone. |
| if (LD->getAlignment() >= ABIAlignment) |
| return SDValue(); |
| |
| SDValue Chain = LD->getChain(); |
| SDValue BasePtr = LD->getBasePtr(); |
| DebugLoc DL = Op.getDebugLoc(); |
| |
| SDValue Base; |
| int64_t Offset; |
| if (!LD->isVolatile() && |
| IsWordAlignedBasePlusConstantOffset(BasePtr, Base, Offset)) { |
| if (Offset % 4 == 0) { |
| // We've managed to infer better alignment information than the load |
| // already has. Use an aligned load. |
| // |
| return DAG.getLoad(getPointerTy(), DL, Chain, BasePtr, |
| MachinePointerInfo(), |
| false, false, 0); |
| } |
| // Lower to |
| // ldw low, base[offset >> 2] |
| // ldw high, base[(offset >> 2) + 1] |
| // shr low_shifted, low, (offset & 0x3) * 8 |
| // shl high_shifted, high, 32 - (offset & 0x3) * 8 |
| // or result, low_shifted, high_shifted |
| SDValue LowOffset = DAG.getConstant(Offset & ~0x3, MVT::i32); |
| SDValue HighOffset = DAG.getConstant((Offset & ~0x3) + 4, MVT::i32); |
| SDValue LowShift = DAG.getConstant((Offset & 0x3) * 8, MVT::i32); |
| SDValue HighShift = DAG.getConstant(32 - (Offset & 0x3) * 8, MVT::i32); |
| |
| SDValue LowAddr = DAG.getNode(ISD::ADD, DL, MVT::i32, Base, LowOffset); |
| SDValue HighAddr = DAG.getNode(ISD::ADD, DL, MVT::i32, Base, HighOffset); |
| |
| SDValue Low = DAG.getLoad(getPointerTy(), DL, Chain, |
| LowAddr, MachinePointerInfo(), false, false, 0); |
| SDValue High = DAG.getLoad(getPointerTy(), DL, Chain, |
| HighAddr, MachinePointerInfo(), false, false, 0); |
| SDValue LowShifted = DAG.getNode(ISD::SRL, DL, MVT::i32, Low, LowShift); |
| SDValue HighShifted = DAG.getNode(ISD::SHL, DL, MVT::i32, High, HighShift); |
| SDValue Result = DAG.getNode(ISD::OR, DL, MVT::i32, LowShifted, HighShifted); |
| Chain = DAG.getNode(ISD::TokenFactor, DL, MVT::Other, Low.getValue(1), |
| High.getValue(1)); |
| SDValue Ops[] = { Result, Chain }; |
| return DAG.getMergeValues(Ops, 2, DL); |
| } |
| |
| if (LD->getAlignment() == 2) { |
| SDValue Low = DAG.getExtLoad(ISD::ZEXTLOAD, DL, MVT::i32, Chain, |
| BasePtr, LD->getPointerInfo(), MVT::i16, |
| LD->isVolatile(), LD->isNonTemporal(), 2); |
| SDValue HighAddr = DAG.getNode(ISD::ADD, DL, MVT::i32, BasePtr, |
| DAG.getConstant(2, MVT::i32)); |
| SDValue High = DAG.getExtLoad(ISD::EXTLOAD, DL, MVT::i32, Chain, |
| HighAddr, |
| LD->getPointerInfo().getWithOffset(2), |
| MVT::i16, LD->isVolatile(), |
| LD->isNonTemporal(), 2); |
| SDValue HighShifted = DAG.getNode(ISD::SHL, DL, MVT::i32, High, |
| DAG.getConstant(16, MVT::i32)); |
| SDValue Result = DAG.getNode(ISD::OR, DL, MVT::i32, Low, HighShifted); |
| Chain = DAG.getNode(ISD::TokenFactor, DL, MVT::Other, Low.getValue(1), |
| High.getValue(1)); |
| SDValue Ops[] = { Result, Chain }; |
| return DAG.getMergeValues(Ops, 2, DL); |
| } |
| |
| // Lower to a call to __misaligned_load(BasePtr). |
| Type *IntPtrTy = getTargetData()->getIntPtrType(*DAG.getContext()); |
| TargetLowering::ArgListTy Args; |
| TargetLowering::ArgListEntry Entry; |
| |
| Entry.Ty = IntPtrTy; |
| Entry.Node = BasePtr; |
| Args.push_back(Entry); |
| |
| std::pair<SDValue, SDValue> CallResult = |
| LowerCallTo(Chain, IntPtrTy, false, false, |
| false, false, 0, CallingConv::C, false, |
| /*isReturnValueUsed=*/true, |
| DAG.getExternalSymbol("__misaligned_load", getPointerTy()), |
| Args, DAG, DL); |
| |
| SDValue Ops[] = |
| { CallResult.first, CallResult.second }; |
| |
| return DAG.getMergeValues(Ops, 2, DL); |
| } |
| |
| SDValue XCoreTargetLowering:: |
| LowerSTORE(SDValue Op, SelectionDAG &DAG) const |
| { |
| StoreSDNode *ST = cast<StoreSDNode>(Op); |
| assert(!ST->isTruncatingStore() && "Unexpected store type"); |
| assert(ST->getMemoryVT() == MVT::i32 && "Unexpected store EVT"); |
| if (allowsUnalignedMemoryAccesses(ST->getMemoryVT())) { |
| return SDValue(); |
| } |
| unsigned ABIAlignment = getTargetData()-> |
| getABITypeAlignment(ST->getMemoryVT().getTypeForEVT(*DAG.getContext())); |
| // Leave aligned store alone. |
| if (ST->getAlignment() >= ABIAlignment) { |
| return SDValue(); |
| } |
| SDValue Chain = ST->getChain(); |
| SDValue BasePtr = ST->getBasePtr(); |
| SDValue Value = ST->getValue(); |
| DebugLoc dl = Op.getDebugLoc(); |
| |
| if (ST->getAlignment() == 2) { |
| SDValue Low = Value; |
| SDValue High = DAG.getNode(ISD::SRL, dl, MVT::i32, Value, |
| DAG.getConstant(16, MVT::i32)); |
| SDValue StoreLow = DAG.getTruncStore(Chain, dl, Low, BasePtr, |
| ST->getPointerInfo(), MVT::i16, |
| ST->isVolatile(), ST->isNonTemporal(), |
| 2); |
| SDValue HighAddr = DAG.getNode(ISD::ADD, dl, MVT::i32, BasePtr, |
| DAG.getConstant(2, MVT::i32)); |
| SDValue StoreHigh = DAG.getTruncStore(Chain, dl, High, HighAddr, |
| ST->getPointerInfo().getWithOffset(2), |
| MVT::i16, ST->isVolatile(), |
| ST->isNonTemporal(), 2); |
| return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, StoreLow, StoreHigh); |
| } |
| |
| // Lower to a call to __misaligned_store(BasePtr, Value). |
| Type *IntPtrTy = getTargetData()->getIntPtrType(*DAG.getContext()); |
| TargetLowering::ArgListTy Args; |
| TargetLowering::ArgListEntry Entry; |
| |
| Entry.Ty = IntPtrTy; |
| Entry.Node = BasePtr; |
| Args.push_back(Entry); |
| |
| Entry.Node = Value; |
| Args.push_back(Entry); |
| |
| std::pair<SDValue, SDValue> CallResult = |
| LowerCallTo(Chain, Type::getVoidTy(*DAG.getContext()), false, false, |
| false, false, 0, CallingConv::C, false, |
| /*isReturnValueUsed=*/true, |
| DAG.getExternalSymbol("__misaligned_store", getPointerTy()), |
| Args, DAG, dl); |
| |
| return CallResult.second; |
| } |
| |
| SDValue XCoreTargetLowering:: |
| LowerSMUL_LOHI(SDValue Op, SelectionDAG &DAG) const |
| { |
| assert(Op.getValueType() == MVT::i32 && Op.getOpcode() == ISD::SMUL_LOHI && |
| "Unexpected operand to lower!"); |
| DebugLoc dl = Op.getDebugLoc(); |
| SDValue LHS = Op.getOperand(0); |
| SDValue RHS = Op.getOperand(1); |
| SDValue Zero = DAG.getConstant(0, MVT::i32); |
| SDValue Hi = DAG.getNode(XCoreISD::MACCS, dl, |
| DAG.getVTList(MVT::i32, MVT::i32), Zero, Zero, |
| LHS, RHS); |
| SDValue Lo(Hi.getNode(), 1); |
| SDValue Ops[] = { Lo, Hi }; |
| return DAG.getMergeValues(Ops, 2, dl); |
| } |
| |
| SDValue XCoreTargetLowering:: |
| LowerUMUL_LOHI(SDValue Op, SelectionDAG &DAG) const |
| { |
| assert(Op.getValueType() == MVT::i32 && Op.getOpcode() == ISD::UMUL_LOHI && |
| "Unexpected operand to lower!"); |
| DebugLoc dl = Op.getDebugLoc(); |
| SDValue LHS = Op.getOperand(0); |
| SDValue RHS = Op.getOperand(1); |
| SDValue Zero = DAG.getConstant(0, MVT::i32); |
| SDValue Hi = DAG.getNode(XCoreISD::LMUL, dl, |
| DAG.getVTList(MVT::i32, MVT::i32), LHS, RHS, |
| Zero, Zero); |
| SDValue Lo(Hi.getNode(), 1); |
| SDValue Ops[] = { Lo, Hi }; |
| return DAG.getMergeValues(Ops, 2, dl); |
| } |
| |
| /// isADDADDMUL - Return whether Op is in a form that is equivalent to |
| /// add(add(mul(x,y),a),b). If requireIntermediatesHaveOneUse is true then |
| /// each intermediate result in the calculation must also have a single use. |
| /// If the Op is in the correct form the constituent parts are written to Mul0, |
| /// Mul1, Addend0 and Addend1. |
| static bool |
| isADDADDMUL(SDValue Op, SDValue &Mul0, SDValue &Mul1, SDValue &Addend0, |
| SDValue &Addend1, bool requireIntermediatesHaveOneUse) |
| { |
| if (Op.getOpcode() != ISD::ADD) |
| return false; |
| SDValue N0 = Op.getOperand(0); |
| SDValue N1 = Op.getOperand(1); |
| SDValue AddOp; |
| SDValue OtherOp; |
| if (N0.getOpcode() == ISD::ADD) { |
| AddOp = N0; |
| OtherOp = N1; |
| } else if (N1.getOpcode() == ISD::ADD) { |
| AddOp = N1; |
| OtherOp = N0; |
| } else { |
| return false; |
| } |
| if (requireIntermediatesHaveOneUse && !AddOp.hasOneUse()) |
| return false; |
| if (OtherOp.getOpcode() == ISD::MUL) { |
| // add(add(a,b),mul(x,y)) |
| if (requireIntermediatesHaveOneUse && !OtherOp.hasOneUse()) |
| return false; |
| Mul0 = OtherOp.getOperand(0); |
| Mul1 = OtherOp.getOperand(1); |
| Addend0 = AddOp.getOperand(0); |
| Addend1 = AddOp.getOperand(1); |
| return true; |
| } |
| if (AddOp.getOperand(0).getOpcode() == ISD::MUL) { |
| // add(add(mul(x,y),a),b) |
| if (requireIntermediatesHaveOneUse && !AddOp.getOperand(0).hasOneUse()) |
| return false; |
| Mul0 = AddOp.getOperand(0).getOperand(0); |
| Mul1 = AddOp.getOperand(0).getOperand(1); |
| Addend0 = AddOp.getOperand(1); |
| Addend1 = OtherOp; |
| return true; |
| } |
| if (AddOp.getOperand(1).getOpcode() == ISD::MUL) { |
| // add(add(a,mul(x,y)),b) |
| if (requireIntermediatesHaveOneUse && !AddOp.getOperand(1).hasOneUse()) |
| return false; |
| Mul0 = AddOp.getOperand(1).getOperand(0); |
| Mul1 = AddOp.getOperand(1).getOperand(1); |
| Addend0 = AddOp.getOperand(0); |
| Addend1 = OtherOp; |
| return true; |
| } |
| return false; |
| } |
| |
| SDValue XCoreTargetLowering:: |
| TryExpandADDWithMul(SDNode *N, SelectionDAG &DAG) const |
| { |
| SDValue Mul; |
| SDValue Other; |
| if (N->getOperand(0).getOpcode() == ISD::MUL) { |
| Mul = N->getOperand(0); |
| Other = N->getOperand(1); |
| } else if (N->getOperand(1).getOpcode() == ISD::MUL) { |
| Mul = N->getOperand(1); |
| Other = N->getOperand(0); |
| } else { |
| return SDValue(); |
| } |
| DebugLoc dl = N->getDebugLoc(); |
| SDValue LL, RL, AddendL, AddendH; |
| LL = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, |
| Mul.getOperand(0), DAG.getConstant(0, MVT::i32)); |
| RL = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, |
| Mul.getOperand(1), DAG.getConstant(0, MVT::i32)); |
| AddendL = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, |
| Other, DAG.getConstant(0, MVT::i32)); |
| AddendH = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, |
| Other, DAG.getConstant(1, MVT::i32)); |
| APInt HighMask = APInt::getHighBitsSet(64, 32); |
| unsigned LHSSB = DAG.ComputeNumSignBits(Mul.getOperand(0)); |
| unsigned RHSSB = DAG.ComputeNumSignBits(Mul.getOperand(1)); |
| if (DAG.MaskedValueIsZero(Mul.getOperand(0), HighMask) && |
| DAG.MaskedValueIsZero(Mul.getOperand(1), HighMask)) { |
| // The inputs are both zero-extended. |
| SDValue Hi = DAG.getNode(XCoreISD::MACCU, dl, |
| DAG.getVTList(MVT::i32, MVT::i32), AddendH, |
| AddendL, LL, RL); |
| SDValue Lo(Hi.getNode(), 1); |
| return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Lo, Hi); |
| } |
| if (LHSSB > 32 && RHSSB > 32) { |
| // The inputs are both sign-extended. |
| SDValue Hi = DAG.getNode(XCoreISD::MACCS, dl, |
| DAG.getVTList(MVT::i32, MVT::i32), AddendH, |
| AddendL, LL, RL); |
| SDValue Lo(Hi.getNode(), 1); |
| return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Lo, Hi); |
| } |
| SDValue LH, RH; |
| LH = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, |
| Mul.getOperand(0), DAG.getConstant(1, MVT::i32)); |
| RH = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, |
| Mul.getOperand(1), DAG.getConstant(1, MVT::i32)); |
| SDValue Hi = DAG.getNode(XCoreISD::MACCU, dl, |
| DAG.getVTList(MVT::i32, MVT::i32), AddendH, |
| AddendL, LL, RL); |
| SDValue Lo(Hi.getNode(), 1); |
| RH = DAG.getNode(ISD::MUL, dl, MVT::i32, LL, RH); |
| LH = DAG.getNode(ISD::MUL, dl, MVT::i32, LH, RL); |
| Hi = DAG.getNode(ISD::ADD, dl, MVT::i32, Hi, RH); |
| Hi = DAG.getNode(ISD::ADD, dl, MVT::i32, Hi, LH); |
| return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Lo, Hi); |
| } |
| |
| SDValue XCoreTargetLowering:: |
| ExpandADDSUB(SDNode *N, SelectionDAG &DAG) const |
| { |
| assert(N->getValueType(0) == MVT::i64 && |
| (N->getOpcode() == ISD::ADD || N->getOpcode() == ISD::SUB) && |
| "Unknown operand to lower!"); |
| |
| if (N->getOpcode() == ISD::ADD) { |
| SDValue Result = TryExpandADDWithMul(N, DAG); |
| if (Result.getNode() != 0) |
| return Result; |
| } |
| |
| DebugLoc dl = N->getDebugLoc(); |
| |
| // Extract components |
| SDValue LHSL = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, |
| N->getOperand(0), DAG.getConstant(0, MVT::i32)); |
| SDValue LHSH = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, |
| N->getOperand(0), DAG.getConstant(1, MVT::i32)); |
| SDValue RHSL = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, |
| N->getOperand(1), DAG.getConstant(0, MVT::i32)); |
| SDValue RHSH = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, |
| N->getOperand(1), DAG.getConstant(1, MVT::i32)); |
| |
| // Expand |
| unsigned Opcode = (N->getOpcode() == ISD::ADD) ? XCoreISD::LADD : |
| XCoreISD::LSUB; |
| SDValue Zero = DAG.getConstant(0, MVT::i32); |
| SDValue Carry = DAG.getNode(Opcode, dl, DAG.getVTList(MVT::i32, MVT::i32), |
| LHSL, RHSL, Zero); |
| SDValue Lo(Carry.getNode(), 1); |
| |
| SDValue Ignored = DAG.getNode(Opcode, dl, DAG.getVTList(MVT::i32, MVT::i32), |
| LHSH, RHSH, Carry); |
| SDValue Hi(Ignored.getNode(), 1); |
| // Merge the pieces |
| return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Lo, Hi); |
| } |
| |
| SDValue XCoreTargetLowering:: |
| LowerVAARG(SDValue Op, SelectionDAG &DAG) const |
| { |
| llvm_unreachable("unimplemented"); |
| // FIX Arguments passed by reference need a extra dereference. |
| SDNode *Node = Op.getNode(); |
| DebugLoc dl = Node->getDebugLoc(); |
| const Value *V = cast<SrcValueSDNode>(Node->getOperand(2))->getValue(); |
| EVT VT = Node->getValueType(0); |
| SDValue VAList = DAG.getLoad(getPointerTy(), dl, Node->getOperand(0), |
| Node->getOperand(1), MachinePointerInfo(V), |
| false, false, 0); |
| // Increment the pointer, VAList, to the next vararg |
| SDValue Tmp3 = DAG.getNode(ISD::ADD, dl, getPointerTy(), VAList, |
| DAG.getConstant(VT.getSizeInBits(), |
| getPointerTy())); |
| // Store the incremented VAList to the legalized pointer |
| Tmp3 = DAG.getStore(VAList.getValue(1), dl, Tmp3, Node->getOperand(1), |
| MachinePointerInfo(V), false, false, 0); |
| // Load the actual argument out of the pointer VAList |
| return DAG.getLoad(VT, dl, Tmp3, VAList, MachinePointerInfo(), |
| false, false, 0); |
| } |
| |
| SDValue XCoreTargetLowering:: |
| LowerVASTART(SDValue Op, SelectionDAG &DAG) const |
| { |
| DebugLoc dl = Op.getDebugLoc(); |
| // vastart stores the address of the VarArgsFrameIndex slot into the |
| // memory location argument |
| MachineFunction &MF = DAG.getMachineFunction(); |
| XCoreFunctionInfo *XFI = MF.getInfo<XCoreFunctionInfo>(); |
| SDValue Addr = DAG.getFrameIndex(XFI->getVarArgsFrameIndex(), MVT::i32); |
| return DAG.getStore(Op.getOperand(0), dl, Addr, Op.getOperand(1), |
| MachinePointerInfo(), false, false, 0); |
| } |
| |
| SDValue XCoreTargetLowering::LowerFRAMEADDR(SDValue Op, |
| SelectionDAG &DAG) const { |
| DebugLoc dl = Op.getDebugLoc(); |
| // Depths > 0 not supported yet! |
| if (cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue() > 0) |
| return SDValue(); |
| |
| MachineFunction &MF = DAG.getMachineFunction(); |
| const TargetRegisterInfo *RegInfo = getTargetMachine().getRegisterInfo(); |
| return DAG.getCopyFromReg(DAG.getEntryNode(), dl, |
| RegInfo->getFrameRegister(MF), MVT::i32); |
| } |
| |
| SDValue XCoreTargetLowering:: |
| LowerADJUST_TRAMPOLINE(SDValue Op, SelectionDAG &DAG) const { |
| return Op.getOperand(0); |
| } |
| |
| SDValue XCoreTargetLowering:: |
| LowerINIT_TRAMPOLINE(SDValue Op, SelectionDAG &DAG) const { |
| SDValue Chain = Op.getOperand(0); |
| SDValue Trmp = Op.getOperand(1); // trampoline |
| SDValue FPtr = Op.getOperand(2); // nested function |
| SDValue Nest = Op.getOperand(3); // 'nest' parameter value |
| |
| const Value *TrmpAddr = cast<SrcValueSDNode>(Op.getOperand(4))->getValue(); |
| |
| // .align 4 |
| // LDAPF_u10 r11, nest |
| // LDW_2rus r11, r11[0] |
| // STWSP_ru6 r11, sp[0] |
| // LDAPF_u10 r11, fptr |
| // LDW_2rus r11, r11[0] |
| // BAU_1r r11 |
| // nest: |
| // .word nest |
| // fptr: |
| // .word fptr |
| SDValue OutChains[5]; |
| |
| SDValue Addr = Trmp; |
| |
| DebugLoc dl = Op.getDebugLoc(); |
| OutChains[0] = DAG.getStore(Chain, dl, DAG.getConstant(0x0a3cd805, MVT::i32), |
| Addr, MachinePointerInfo(TrmpAddr), false, false, |
| 0); |
| |
| Addr = DAG.getNode(ISD::ADD, dl, MVT::i32, Trmp, |
| DAG.getConstant(4, MVT::i32)); |
| OutChains[1] = DAG.getStore(Chain, dl, DAG.getConstant(0xd80456c0, MVT::i32), |
| Addr, MachinePointerInfo(TrmpAddr, 4), false, |
| false, 0); |
| |
| Addr = DAG.getNode(ISD::ADD, dl, MVT::i32, Trmp, |
| DAG.getConstant(8, MVT::i32)); |
| OutChains[2] = DAG.getStore(Chain, dl, DAG.getConstant(0x27fb0a3c, MVT::i32), |
| Addr, MachinePointerInfo(TrmpAddr, 8), false, |
| false, 0); |
| |
| Addr = DAG.getNode(ISD::ADD, dl, MVT::i32, Trmp, |
| DAG.getConstant(12, MVT::i32)); |
| OutChains[3] = DAG.getStore(Chain, dl, Nest, Addr, |
| MachinePointerInfo(TrmpAddr, 12), false, false, |
| 0); |
| |
| Addr = DAG.getNode(ISD::ADD, dl, MVT::i32, Trmp, |
| DAG.getConstant(16, MVT::i32)); |
| OutChains[4] = DAG.getStore(Chain, dl, FPtr, Addr, |
| MachinePointerInfo(TrmpAddr, 16), false, false, |
| 0); |
| |
| return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, OutChains, 5); |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // Calling Convention Implementation |
| //===----------------------------------------------------------------------===// |
| |
| #include "XCoreGenCallingConv.inc" |
| |
| //===----------------------------------------------------------------------===// |
| // Call Calling Convention Implementation |
| //===----------------------------------------------------------------------===// |
| |
| /// XCore call implementation |
| SDValue |
| XCoreTargetLowering::LowerCall(SDValue Chain, SDValue Callee, |
| CallingConv::ID CallConv, bool isVarArg, |
| bool &isTailCall, |
| const SmallVectorImpl<ISD::OutputArg> &Outs, |
| const SmallVectorImpl<SDValue> &OutVals, |
| const SmallVectorImpl<ISD::InputArg> &Ins, |
| DebugLoc dl, SelectionDAG &DAG, |
| SmallVectorImpl<SDValue> &InVals) const { |
| // XCore target does not yet support tail call optimization. |
| isTailCall = false; |
| |
| // For now, only CallingConv::C implemented |
| switch (CallConv) |
| { |
| default: |
| llvm_unreachable("Unsupported calling convention"); |
| case CallingConv::Fast: |
| case CallingConv::C: |
| return LowerCCCCallTo(Chain, Callee, CallConv, isVarArg, isTailCall, |
| Outs, OutVals, Ins, dl, DAG, InVals); |
| } |
| } |
| |
| /// LowerCCCCallTo - functions arguments are copied from virtual |
| /// regs to (physical regs)/(stack frame), CALLSEQ_START and |
| /// CALLSEQ_END are emitted. |
| /// TODO: isTailCall, sret. |
| SDValue |
| XCoreTargetLowering::LowerCCCCallTo(SDValue Chain, SDValue Callee, |
| CallingConv::ID CallConv, bool isVarArg, |
| bool isTailCall, |
| const SmallVectorImpl<ISD::OutputArg> &Outs, |
| const SmallVectorImpl<SDValue> &OutVals, |
| const SmallVectorImpl<ISD::InputArg> &Ins, |
| DebugLoc dl, SelectionDAG &DAG, |
| SmallVectorImpl<SDValue> &InVals) const { |
| |
| // Analyze operands of the call, assigning locations to each operand. |
| SmallVector<CCValAssign, 16> ArgLocs; |
| CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), |
| getTargetMachine(), ArgLocs, *DAG.getContext()); |
| |
| // The ABI dictates there should be one stack slot available to the callee |
| // on function entry (for saving lr). |
| CCInfo.AllocateStack(4, 4); |
| |
| CCInfo.AnalyzeCallOperands(Outs, CC_XCore); |
| |
| // 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<std::pair<unsigned, SDValue>, 4> RegsToPass; |
| SmallVector<SDValue, 12> MemOpChains; |
| |
| // Walk the register/memloc assignments, inserting copies/loads. |
| for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) { |
| CCValAssign &VA = ArgLocs[i]; |
| SDValue Arg = OutVals[i]; |
| |
| // Promote the value if needed. |
| switch (VA.getLocInfo()) { |
| default: llvm_unreachable("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()); |
| |
| int Offset = VA.getLocMemOffset(); |
| |
| MemOpChains.push_back(DAG.getNode(XCoreISD::STWSP, dl, MVT::Other, |
| Chain, Arg, |
| DAG.getConstant(Offset/4, MVT::i32))); |
| } |
| } |
| |
| // 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 emitted 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<GlobalAddressSDNode>(Callee)) |
| Callee = DAG.getTargetGlobalAddress(G->getGlobal(), dl, MVT::i32); |
| else if (ExternalSymbolSDNode *E = dyn_cast<ExternalSymbolSDNode>(Callee)) |
| Callee = DAG.getTargetExternalSymbol(E->getSymbol(), MVT::i32); |
| |
| // XCoreBranchLink = #chain, #target_address, #opt_in_flags... |
| // = Chain, Callee, Reg#1, Reg#2, ... |
| // |
| // Returns a chain & a flag for retval copy to use. |
| SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue); |
| SmallVector<SDValue, 8> 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(XCoreISD::BL, 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 |
| XCoreTargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag, |
| CallingConv::ID CallConv, bool isVarArg, |
| const SmallVectorImpl<ISD::InputArg> &Ins, |
| DebugLoc dl, SelectionDAG &DAG, |
| SmallVectorImpl<SDValue> &InVals) const { |
| |
| // Assign locations to each value returned by this call. |
| SmallVector<CCValAssign, 16> RVLocs; |
| CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), |
| getTargetMachine(), RVLocs, *DAG.getContext()); |
| |
| CCInfo.AnalyzeCallResult(Ins, RetCC_XCore); |
| |
| // Copy all of the result registers out of their specified physreg. |
| for (unsigned i = 0; i != RVLocs.size(); ++i) { |
| Chain = DAG.getCopyFromReg(Chain, dl, RVLocs[i].getLocReg(), |
| RVLocs[i].getValVT(), InFlag).getValue(1); |
| InFlag = Chain.getValue(2); |
| InVals.push_back(Chain.getValue(0)); |
| } |
| |
| return Chain; |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // Formal Arguments Calling Convention Implementation |
| //===----------------------------------------------------------------------===// |
| |
| /// XCore formal arguments implementation |
| SDValue |
| XCoreTargetLowering::LowerFormalArguments(SDValue Chain, |
| CallingConv::ID CallConv, |
| bool isVarArg, |
| const SmallVectorImpl<ISD::InputArg> &Ins, |
| DebugLoc dl, |
| SelectionDAG &DAG, |
| SmallVectorImpl<SDValue> &InVals) |
| const { |
| switch (CallConv) |
| { |
| default: |
| llvm_unreachable("Unsupported calling convention"); |
| case CallingConv::C: |
| case CallingConv::Fast: |
| return LowerCCCArguments(Chain, CallConv, isVarArg, |
| Ins, dl, DAG, InVals); |
| } |
| } |
| |
| /// LowerCCCArguments - transform physical registers into |
| /// virtual registers and generate load operations for |
| /// arguments places on the stack. |
| /// TODO: sret |
| SDValue |
| XCoreTargetLowering::LowerCCCArguments(SDValue Chain, |
| CallingConv::ID CallConv, |
| bool isVarArg, |
| const SmallVectorImpl<ISD::InputArg> |
| &Ins, |
| DebugLoc dl, |
| SelectionDAG &DAG, |
| SmallVectorImpl<SDValue> &InVals) const { |
| MachineFunction &MF = DAG.getMachineFunction(); |
| MachineFrameInfo *MFI = MF.getFrameInfo(); |
| MachineRegisterInfo &RegInfo = MF.getRegInfo(); |
| |
| // Assign locations to all of the incoming arguments. |
| SmallVector<CCValAssign, 16> ArgLocs; |
| CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), |
| getTargetMachine(), ArgLocs, *DAG.getContext()); |
| |
| CCInfo.AnalyzeFormalArguments(Ins, CC_XCore); |
| |
| unsigned StackSlotSize = XCoreFrameLowering::stackSlotSize(); |
| |
| unsigned LRSaveSize = StackSlotSize; |
| |
| for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) { |
| |
| CCValAssign &VA = ArgLocs[i]; |
| |
| if (VA.isRegLoc()) { |
| // Arguments passed in registers |
| EVT RegVT = VA.getLocVT(); |
| switch (RegVT.getSimpleVT().SimpleTy) { |
| default: |
| { |
| #ifndef NDEBUG |
| errs() << "LowerFormalArguments Unhandled argument type: " |
| << RegVT.getSimpleVT().SimpleTy << "\n"; |
| #endif |
| llvm_unreachable(0); |
| } |
| case MVT::i32: |
| unsigned VReg = RegInfo.createVirtualRegister( |
| XCore::GRRegsRegisterClass); |
| RegInfo.addLiveIn(VA.getLocReg(), VReg); |
| InVals.push_back(DAG.getCopyFromReg(Chain, dl, VReg, RegVT)); |
| } |
| } else { |
| // sanity check |
| assert(VA.isMemLoc()); |
| // Load the argument to a virtual register |
| unsigned ObjSize = VA.getLocVT().getSizeInBits()/8; |
| if (ObjSize > StackSlotSize) { |
| errs() << "LowerFormalArguments Unhandled argument type: " |
| << EVT(VA.getLocVT()).getEVTString() |
| << "\n"; |
| } |
| // Create the frame index object for this incoming parameter... |
| int FI = MFI->CreateFixedObject(ObjSize, |
| LRSaveSize + VA.getLocMemOffset(), |
| true); |
| |
| // Create the SelectionDAG nodes corresponding to a load |
| //from this parameter |
| SDValue FIN = DAG.getFrameIndex(FI, MVT::i32); |
| InVals.push_back(DAG.getLoad(VA.getLocVT(), dl, Chain, FIN, |
| MachinePointerInfo::getFixedStack(FI), |
| false, false, 0)); |
| } |
| } |
| |
| if (isVarArg) { |
| /* Argument registers */ |
| static const unsigned ArgRegs[] = { |
| XCore::R0, XCore::R1, XCore::R2, XCore::R3 |
| }; |
| XCoreFunctionInfo *XFI = MF.getInfo<XCoreFunctionInfo>(); |
| unsigned FirstVAReg = CCInfo.getFirstUnallocated(ArgRegs, |
| array_lengthof(ArgRegs)); |
| if (FirstVAReg < array_lengthof(ArgRegs)) { |
| SmallVector<SDValue, 4> MemOps; |
| int offset = 0; |
| // Save remaining registers, storing higher register numbers at a higher |
| // address |
| for (int i = array_lengthof(ArgRegs) - 1; i >= (int)FirstVAReg; --i) { |
| // Create a stack slot |
| int FI = MFI->CreateFixedObject(4, offset, true); |
| if (i == (int)FirstVAReg) { |
| XFI->setVarArgsFrameIndex(FI); |
| } |
| offset -= StackSlotSize; |
| SDValue FIN = DAG.getFrameIndex(FI, MVT::i32); |
| // Move argument from phys reg -> virt reg |
| unsigned VReg = RegInfo.createVirtualRegister( |
| XCore::GRRegsRegisterClass); |
| RegInfo.addLiveIn(ArgRegs[i], VReg); |
| SDValue Val = DAG.getCopyFromReg(Chain, dl, VReg, MVT::i32); |
| // Move argument from virt reg -> stack |
| SDValue Store = DAG.getStore(Val.getValue(1), dl, Val, FIN, |
| MachinePointerInfo(), false, false, 0); |
| MemOps.push_back(Store); |
| } |
| if (!MemOps.empty()) |
| Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, |
| &MemOps[0], MemOps.size()); |
| } else { |
| // This will point to the next argument passed via stack. |
| XFI->setVarArgsFrameIndex( |
| MFI->CreateFixedObject(4, LRSaveSize + CCInfo.getNextStackOffset(), |
| true)); |
| } |
| } |
| |
| return Chain; |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // Return Value Calling Convention Implementation |
| //===----------------------------------------------------------------------===// |
| |
| bool XCoreTargetLowering:: |
| CanLowerReturn(CallingConv::ID CallConv, MachineFunction &MF, |
| bool isVarArg, |
| const SmallVectorImpl<ISD::OutputArg> &Outs, |
| LLVMContext &Context) const { |
| SmallVector<CCValAssign, 16> RVLocs; |
| CCState CCInfo(CallConv, isVarArg, MF, getTargetMachine(), RVLocs, Context); |
| return CCInfo.CheckReturn(Outs, RetCC_XCore); |
| } |
| |
| SDValue |
| XCoreTargetLowering::LowerReturn(SDValue Chain, |
| CallingConv::ID CallConv, bool isVarArg, |
| const SmallVectorImpl<ISD::OutputArg> &Outs, |
| const SmallVectorImpl<SDValue> &OutVals, |
| DebugLoc dl, SelectionDAG &DAG) const { |
| |
| // CCValAssign - represent the assignment of |
| // the return value to a location |
| SmallVector<CCValAssign, 16> RVLocs; |
| |
| // CCState - Info about the registers and stack slot. |
| CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), |
| getTargetMachine(), RVLocs, *DAG.getContext()); |
| |
| // Analyze return values. |
| CCInfo.AnalyzeReturn(Outs, RetCC_XCore); |
| |
| // 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]; |
| assert(VA.isRegLoc() && "Can only return in registers!"); |
| |
| Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), |
| OutVals[i], Flag); |
| |
| // guarantee that all emitted copies are |
| // stuck together, avoiding something bad |
| Flag = Chain.getValue(1); |
| } |
| |
| // Return on XCore is always a "retsp 0" |
| if (Flag.getNode()) |
| return DAG.getNode(XCoreISD::RETSP, dl, MVT::Other, |
| Chain, DAG.getConstant(0, MVT::i32), Flag); |
| else // Return Void |
| return DAG.getNode(XCoreISD::RETSP, dl, MVT::Other, |
| Chain, DAG.getConstant(0, MVT::i32)); |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // Other Lowering Code |
| //===----------------------------------------------------------------------===// |
| |
| MachineBasicBlock * |
| XCoreTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI, |
| MachineBasicBlock *BB) const { |
| const TargetInstrInfo &TII = *getTargetMachine().getInstrInfo(); |
| DebugLoc dl = MI->getDebugLoc(); |
| assert((MI->getOpcode() == XCore::SELECT_CC) && |
| "Unexpected instr type to insert"); |
| |
| // To "insert" a SELECT_CC 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 It = BB; |
| ++It; |
| |
| // thisMBB: |
| // ... |
| // TrueVal = ... |
| // cmpTY ccX, r1, r2 |
| // bCC copy1MBB |
| // fallthrough --> copy0MBB |
| MachineBasicBlock *thisMBB = BB; |
| MachineFunction *F = BB->getParent(); |
| MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB); |
| MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB); |
| F->insert(It, copy0MBB); |
| F->insert(It, sinkMBB); |
| |
| // Transfer the remainder of BB and its successor edges to sinkMBB. |
| sinkMBB->splice(sinkMBB->begin(), BB, |
| llvm::next(MachineBasicBlock::iterator(MI)), |
| BB->end()); |
| sinkMBB->transferSuccessorsAndUpdatePHIs(BB); |
| |
| // Next, add the true and fallthrough blocks as its successors. |
| BB->addSuccessor(copy0MBB); |
| BB->addSuccessor(sinkMBB); |
| |
| BuildMI(BB, dl, TII.get(XCore::BRFT_lru6)) |
| .addReg(MI->getOperand(1).getReg()).addMBB(sinkMBB); |
| |
| // copy0MBB: |
| // %FalseValue = ... |
| // # fallthrough to sinkMBB |
| BB = copy0MBB; |
| |
| // Update machine-CFG edges |
| BB->addSuccessor(sinkMBB); |
| |
| // sinkMBB: |
| // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ] |
| // ... |
| BB = sinkMBB; |
| BuildMI(*BB, BB->begin(), dl, |
| TII.get(XCore::PHI), MI->getOperand(0).getReg()) |
| .addReg(MI->getOperand(3).getReg()).addMBB(copy0MBB) |
| .addReg(MI->getOperand(2).getReg()).addMBB(thisMBB); |
| |
| MI->eraseFromParent(); // The pseudo instruction is gone now. |
| return BB; |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // Target Optimization Hooks |
| //===----------------------------------------------------------------------===// |
| |
| SDValue XCoreTargetLowering::PerformDAGCombine(SDNode *N, |
| DAGCombinerInfo &DCI) const { |
| SelectionDAG &DAG = DCI.DAG; |
| DebugLoc dl = N->getDebugLoc(); |
| switch (N->getOpcode()) { |
| default: break; |
| case XCoreISD::LADD: { |
| SDValue N0 = N->getOperand(0); |
| SDValue N1 = N->getOperand(1); |
| SDValue N2 = N->getOperand(2); |
| ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0); |
| ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1); |
| EVT VT = N0.getValueType(); |
| |
| // canonicalize constant to RHS |
| if (N0C && !N1C) |
| return DAG.getNode(XCoreISD::LADD, dl, DAG.getVTList(VT, VT), N1, N0, N2); |
| |
| // fold (ladd 0, 0, x) -> 0, x & 1 |
| if (N0C && N0C->isNullValue() && N1C && N1C->isNullValue()) { |
| SDValue Carry = DAG.getConstant(0, VT); |
| SDValue Result = DAG.getNode(ISD::AND, dl, VT, N2, |
| DAG.getConstant(1, VT)); |
| SDValue Ops [] = { Carry, Result }; |
| return DAG.getMergeValues(Ops, 2, dl); |
| } |
| |
| // fold (ladd x, 0, y) -> 0, add x, y iff carry is unused and y has only the |
| // low bit set |
| if (N1C && N1C->isNullValue() && N->hasNUsesOfValue(0, 0)) { |
| APInt KnownZero, KnownOne; |
| APInt Mask = APInt::getHighBitsSet(VT.getSizeInBits(), |
| VT.getSizeInBits() - 1); |
| DAG.ComputeMaskedBits(N2, Mask, KnownZero, KnownOne); |
| if (KnownZero == Mask) { |
| SDValue Carry = DAG.getConstant(0, VT); |
| SDValue Result = DAG.getNode(ISD::ADD, dl, VT, N0, N2); |
| SDValue Ops [] = { Carry, Result }; |
| return DAG.getMergeValues(Ops, 2, dl); |
| } |
| } |
| } |
| break; |
| case XCoreISD::LSUB: { |
| SDValue N0 = N->getOperand(0); |
| SDValue N1 = N->getOperand(1); |
| SDValue N2 = N->getOperand(2); |
| ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0); |
| ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1); |
| EVT VT = N0.getValueType(); |
| |
| // fold (lsub 0, 0, x) -> x, -x iff x has only the low bit set |
| if (N0C && N0C->isNullValue() && N1C && N1C->isNullValue()) { |
| APInt KnownZero, KnownOne; |
| APInt Mask = APInt::getHighBitsSet(VT.getSizeInBits(), |
| VT.getSizeInBits() - 1); |
| DAG.ComputeMaskedBits(N2, Mask, KnownZero, KnownOne); |
| if (KnownZero == Mask) { |
| SDValue Borrow = N2; |
| SDValue Result = DAG.getNode(ISD::SUB, dl, VT, |
| DAG.getConstant(0, VT), N2); |
| SDValue Ops [] = { Borrow, Result }; |
| return DAG.getMergeValues(Ops, 2, dl); |
| } |
| } |
| |
| // fold (lsub x, 0, y) -> 0, sub x, y iff borrow is unused and y has only the |
| // low bit set |
| if (N1C && N1C->isNullValue() && N->hasNUsesOfValue(0, 0)) { |
| APInt KnownZero, KnownOne; |
| APInt Mask = APInt::getHighBitsSet(VT.getSizeInBits(), |
| VT.getSizeInBits() - 1); |
| DAG.ComputeMaskedBits(N2, Mask, KnownZero, KnownOne); |
| if (KnownZero == Mask) { |
| SDValue Borrow = DAG.getConstant(0, VT); |
| SDValue Result = DAG.getNode(ISD::SUB, dl, VT, N0, N2); |
| SDValue Ops [] = { Borrow, Result }; |
| return DAG.getMergeValues(Ops, 2, dl); |
| } |
| } |
| } |
| break; |
| case XCoreISD::LMUL: { |
| SDValue N0 = N->getOperand(0); |
| SDValue N1 = N->getOperand(1); |
| SDValue N2 = N->getOperand(2); |
| SDValue N3 = N->getOperand(3); |
| ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0); |
| ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1); |
| EVT VT = N0.getValueType(); |
| // Canonicalize multiplicative constant to RHS. If both multiplicative |
| // operands are constant canonicalize smallest to RHS. |
| if ((N0C && !N1C) || |
| (N0C && N1C && N0C->getZExtValue() < N1C->getZExtValue())) |
| return DAG.getNode(XCoreISD::LMUL, dl, DAG.getVTList(VT, VT), |
| N1, N0, N2, N3); |
| |
| // lmul(x, 0, a, b) |
| if (N1C && N1C->isNullValue()) { |
| // If the high result is unused fold to add(a, b) |
| if (N->hasNUsesOfValue(0, 0)) { |
| SDValue Lo = DAG.getNode(ISD::ADD, dl, VT, N2, N3); |
| SDValue Ops [] = { Lo, Lo }; |
| return DAG.getMergeValues(Ops, 2, dl); |
| } |
| // Otherwise fold to ladd(a, b, 0) |
| return DAG.getNode(XCoreISD::LADD, dl, DAG.getVTList(VT, VT), N2, N3, N1); |
| } |
| } |
| break; |
| case ISD::ADD: { |
| // Fold 32 bit expressions such as add(add(mul(x,y),a),b) -> |
| // lmul(x, y, a, b). The high result of lmul will be ignored. |
| // This is only profitable if the intermediate results are unused |
| // elsewhere. |
| SDValue Mul0, Mul1, Addend0, Addend1; |
| if (N->getValueType(0) == MVT::i32 && |
| isADDADDMUL(SDValue(N, 0), Mul0, Mul1, Addend0, Addend1, true)) { |
| SDValue Ignored = DAG.getNode(XCoreISD::LMUL, dl, |
| DAG.getVTList(MVT::i32, MVT::i32), Mul0, |
| Mul1, Addend0, Addend1); |
| SDValue Result(Ignored.getNode(), 1); |
| return Result; |
| } |
| APInt HighMask = APInt::getHighBitsSet(64, 32); |
| // Fold 64 bit expression such as add(add(mul(x,y),a),b) -> |
| // lmul(x, y, a, b) if all operands are zero-extended. We do this |
| // before type legalization as it is messy to match the operands after |
| // that. |
| if (N->getValueType(0) == MVT::i64 && |
| isADDADDMUL(SDValue(N, 0), Mul0, Mul1, Addend0, Addend1, false) && |
| DAG.MaskedValueIsZero(Mul0, HighMask) && |
| DAG.MaskedValueIsZero(Mul1, HighMask) && |
| DAG.MaskedValueIsZero(Addend0, HighMask) && |
| DAG.MaskedValueIsZero(Addend1, HighMask)) { |
| SDValue Mul0L = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, |
| Mul0, DAG.getConstant(0, MVT::i32)); |
| SDValue Mul1L = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, |
| Mul1, DAG.getConstant(0, MVT::i32)); |
| SDValue Addend0L = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, |
| Addend0, DAG.getConstant(0, MVT::i32)); |
| SDValue Addend1L = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32, |
| Addend1, DAG.getConstant(0, MVT::i32)); |
| SDValue Hi = DAG.getNode(XCoreISD::LMUL, dl, |
| DAG.getVTList(MVT::i32, MVT::i32), Mul0L, Mul1L, |
| Addend0L, Addend1L); |
| SDValue Lo(Hi.getNode(), 1); |
| return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Lo, Hi); |
| } |
| } |
| break; |
| case ISD::STORE: { |
| // Replace unaligned store of unaligned load with memmove. |
| StoreSDNode *ST = cast<StoreSDNode>(N); |
| if (!DCI.isBeforeLegalize() || |
| allowsUnalignedMemoryAccesses(ST->getMemoryVT()) || |
| ST->isVolatile() || ST->isIndexed()) { |
| break; |
| } |
| SDValue Chain = ST->getChain(); |
| |
| unsigned StoreBits = ST->getMemoryVT().getStoreSizeInBits(); |
| if (StoreBits % 8) { |
| break; |
| } |
| unsigned ABIAlignment = getTargetData()->getABITypeAlignment( |
| ST->getMemoryVT().getTypeForEVT(*DCI.DAG.getContext())); |
| unsigned Alignment = ST->getAlignment(); |
| if (Alignment >= ABIAlignment) { |
| break; |
| } |
| |
| if (LoadSDNode *LD = dyn_cast<LoadSDNode>(ST->getValue())) { |
| if (LD->hasNUsesOfValue(1, 0) && ST->getMemoryVT() == LD->getMemoryVT() && |
| LD->getAlignment() == Alignment && |
| !LD->isVolatile() && !LD->isIndexed() && |
| Chain.reachesChainWithoutSideEffects(SDValue(LD, 1))) { |
| return DAG.getMemmove(Chain, dl, ST->getBasePtr(), |
| LD->getBasePtr(), |
| DAG.getConstant(StoreBits/8, MVT::i32), |
| Alignment, false, ST->getPointerInfo(), |
| LD->getPointerInfo()); |
| } |
| } |
| break; |
| } |
| } |
| return SDValue(); |
| } |
| |
| void XCoreTargetLowering::computeMaskedBitsForTargetNode(const SDValue Op, |
| const APInt &Mask, |
| APInt &KnownZero, |
| APInt &KnownOne, |
| const SelectionDAG &DAG, |
| unsigned Depth) const { |
| KnownZero = KnownOne = APInt(Mask.getBitWidth(), 0); |
| switch (Op.getOpcode()) { |
| default: break; |
| case XCoreISD::LADD: |
| case XCoreISD::LSUB: |
| if (Op.getResNo() == 0) { |
| // Top bits of carry / borrow are clear. |
| KnownZero = APInt::getHighBitsSet(Mask.getBitWidth(), |
| Mask.getBitWidth() - 1); |
| KnownZero &= Mask; |
| } |
| break; |
| } |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // Addressing mode description hooks |
| //===----------------------------------------------------------------------===// |
| |
| static inline bool isImmUs(int64_t val) |
| { |
| return (val >= 0 && val <= 11); |
| } |
| |
| static inline bool isImmUs2(int64_t val) |
| { |
| return (val%2 == 0 && isImmUs(val/2)); |
| } |
| |
| static inline bool isImmUs4(int64_t val) |
| { |
| return (val%4 == 0 && isImmUs(val/4)); |
| } |
| |
| /// isLegalAddressingMode - Return true if the addressing mode represented |
| /// by AM is legal for this target, for a load/store of the specified type. |
| bool |
| XCoreTargetLowering::isLegalAddressingMode(const AddrMode &AM, |
| Type *Ty) const { |
| if (Ty->getTypeID() == Type::VoidTyID) |
| return AM.Scale == 0 && isImmUs(AM.BaseOffs) && isImmUs4(AM.BaseOffs); |
| |
| const TargetData *TD = TM.getTargetData(); |
| unsigned Size = TD->getTypeAllocSize(Ty); |
| if (AM.BaseGV) { |
| return Size >= 4 && !AM.HasBaseReg && AM.Scale == 0 && |
| AM.BaseOffs%4 == 0; |
| } |
| |
| switch (Size) { |
| case 1: |
| // reg + imm |
| if (AM.Scale == 0) { |
| return isImmUs(AM.BaseOffs); |
| } |
| // reg + reg |
| return AM.Scale == 1 && AM.BaseOffs == 0; |
| case 2: |
| case 3: |
| // reg + imm |
| if (AM.Scale == 0) { |
| return isImmUs2(AM.BaseOffs); |
| } |
| // reg + reg<<1 |
| return AM.Scale == 2 && AM.BaseOffs == 0; |
| default: |
| // reg + imm |
| if (AM.Scale == 0) { |
| return isImmUs4(AM.BaseOffs); |
| } |
| // reg + reg<<2 |
| return AM.Scale == 4 && AM.BaseOffs == 0; |
| } |
| |
| return false; |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // XCore Inline Assembly Support |
| //===----------------------------------------------------------------------===// |
| |
| std::pair<unsigned, const TargetRegisterClass*> |
| XCoreTargetLowering:: |
| getRegForInlineAsmConstraint(const std::string &Constraint, |
| EVT VT) const { |
| if (Constraint.size() == 1) { |
| switch (Constraint[0]) { |
| default : break; |
| case 'r': |
| return std::make_pair(0U, XCore::GRRegsRegisterClass); |
| } |
| } |
| // Use the default implementation in TargetLowering to convert the register |
| // constraint into a member of a register class. |
| return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT); |
| } |