1 //===-- SparcISelLowering.h - Sparc DAG Lowering Interface ------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file defines the interfaces that Sparc uses to lower LLVM code into a 10 // selection DAG. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_LIB_TARGET_SPARC_SPARCISELLOWERING_H 15 #define LLVM_LIB_TARGET_SPARC_SPARCISELLOWERING_H 16 17 #include "Sparc.h" 18 #include "llvm/CodeGen/TargetLowering.h" 19 20 namespace llvm { 21 class SparcSubtarget; 22 23 namespace SPISD { 24 enum NodeType : unsigned { 25 FIRST_NUMBER = ISD::BUILTIN_OP_END, 26 CMPICC, // Compare two GPR operands, set icc+xcc. 27 CMPFCC, // Compare two FP operands, set fcc. 28 CMPFCC_V9, // Compare two FP operands, set fcc (v9 variant). 29 BRICC, // Branch to dest on icc condition 30 BPICC, // Branch to dest on icc condition, with prediction (64-bit only). 31 BPXCC, // Branch to dest on xcc condition, with prediction (64-bit only). 32 BRFCC, // Branch to dest on fcc condition 33 BRFCC_V9, // Branch to dest on fcc condition (v9 variant). 34 BR_REG, // Branch to dest using the comparison of a register with zero. 35 SELECT_ICC, // Select between two values using the current ICC flags. 36 SELECT_XCC, // Select between two values using the current XCC flags. 37 SELECT_FCC, // Select between two values using the current FCC flags. 38 SELECT_REG, // Select between two values using the comparison of a register 39 // with zero. 40 41 Hi, 42 Lo, // Hi/Lo operations, typically on a global address. 43 44 FTOI, // FP to Int within a FP register. 45 ITOF, // Int to FP within a FP register. 46 FTOX, // FP to Int64 within a FP register. 47 XTOF, // Int64 to FP within a FP register. 48 49 CALL, // A call instruction. 50 RET_GLUE, // Return with a glue operand. 51 GLOBAL_BASE_REG, // Global base reg for PIC. 52 FLUSHW, // FLUSH register windows to stack. 53 54 TAIL_CALL, // Tail call 55 56 TLS_ADD, // For Thread Local Storage (TLS). 57 TLS_LD, 58 TLS_CALL, 59 60 LOAD_GDOP, // Load operation w/ gdop relocation. 61 }; 62 } 63 64 class SparcTargetLowering : public TargetLowering { 65 const SparcSubtarget *Subtarget; 66 public: 67 SparcTargetLowering(const TargetMachine &TM, const SparcSubtarget &STI); 68 SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override; 69 70 bool useSoftFloat() const override; 71 72 /// computeKnownBitsForTargetNode - Determine which of the bits specified 73 /// in Mask are known to be either zero or one and return them in the 74 /// KnownZero/KnownOne bitsets. 75 void computeKnownBitsForTargetNode(const SDValue Op, 76 KnownBits &Known, 77 const APInt &DemandedElts, 78 const SelectionDAG &DAG, 79 unsigned Depth = 0) const override; 80 81 MachineBasicBlock * 82 EmitInstrWithCustomInserter(MachineInstr &MI, 83 MachineBasicBlock *MBB) const override; 84 85 const char *getTargetNodeName(unsigned Opcode) const override; 86 87 ConstraintType getConstraintType(StringRef Constraint) const override; 88 ConstraintWeight 89 getSingleConstraintMatchWeight(AsmOperandInfo &info, 90 const char *constraint) const override; 91 void LowerAsmOperandForConstraint(SDValue Op, StringRef Constraint, 92 std::vector<SDValue> &Ops, 93 SelectionDAG &DAG) const override; 94 95 std::pair<unsigned, const TargetRegisterClass *> 96 getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI, 97 StringRef Constraint, MVT VT) const override; 98 99 bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const override; getScalarShiftAmountTy(const DataLayout &,EVT)100 MVT getScalarShiftAmountTy(const DataLayout &, EVT) const override { 101 return MVT::i32; 102 } 103 104 Register getRegisterByName(const char* RegName, LLT VT, 105 const MachineFunction &MF) const override; 106 107 /// If a physical register, this returns the register that receives the 108 /// exception address on entry to an EH pad. 109 Register getExceptionPointerRegister(const Constant * PersonalityFn)110 getExceptionPointerRegister(const Constant *PersonalityFn) const override { 111 return SP::I0; 112 } 113 114 /// If a physical register, this returns the register that receives the 115 /// exception typeid on entry to a landing pad. 116 Register getExceptionSelectorRegister(const Constant * PersonalityFn)117 getExceptionSelectorRegister(const Constant *PersonalityFn) const override { 118 return SP::I1; 119 } 120 121 /// Override to support customized stack guard loading. 122 bool useLoadStackGuardNode() const override; 123 void insertSSPDeclarations(Module &M) const override; 124 125 /// getSetCCResultType - Return the ISD::SETCC ValueType 126 EVT getSetCCResultType(const DataLayout &DL, LLVMContext &Context, 127 EVT VT) const override; 128 129 SDValue 130 LowerFormalArguments(SDValue Chain, CallingConv::ID CallConv, bool isVarArg, 131 const SmallVectorImpl<ISD::InputArg> &Ins, 132 const SDLoc &dl, SelectionDAG &DAG, 133 SmallVectorImpl<SDValue> &InVals) const override; 134 SDValue LowerFormalArguments_32(SDValue Chain, CallingConv::ID CallConv, 135 bool isVarArg, 136 const SmallVectorImpl<ISD::InputArg> &Ins, 137 const SDLoc &dl, SelectionDAG &DAG, 138 SmallVectorImpl<SDValue> &InVals) const; 139 SDValue LowerFormalArguments_64(SDValue Chain, CallingConv::ID CallConv, 140 bool isVarArg, 141 const SmallVectorImpl<ISD::InputArg> &Ins, 142 const SDLoc &dl, SelectionDAG &DAG, 143 SmallVectorImpl<SDValue> &InVals) const; 144 145 SDValue 146 LowerCall(TargetLowering::CallLoweringInfo &CLI, 147 SmallVectorImpl<SDValue> &InVals) const override; 148 SDValue LowerCall_32(TargetLowering::CallLoweringInfo &CLI, 149 SmallVectorImpl<SDValue> &InVals) const; 150 SDValue LowerCall_64(TargetLowering::CallLoweringInfo &CLI, 151 SmallVectorImpl<SDValue> &InVals) const; 152 153 bool CanLowerReturn(CallingConv::ID CallConv, MachineFunction &MF, 154 bool isVarArg, 155 const SmallVectorImpl<ISD::OutputArg> &Outs, 156 LLVMContext &Context) const override; 157 158 SDValue LowerReturn(SDValue Chain, CallingConv::ID CallConv, bool isVarArg, 159 const SmallVectorImpl<ISD::OutputArg> &Outs, 160 const SmallVectorImpl<SDValue> &OutVals, 161 const SDLoc &dl, SelectionDAG &DAG) const override; 162 SDValue LowerReturn_32(SDValue Chain, CallingConv::ID CallConv, 163 bool IsVarArg, 164 const SmallVectorImpl<ISD::OutputArg> &Outs, 165 const SmallVectorImpl<SDValue> &OutVals, 166 const SDLoc &DL, SelectionDAG &DAG) const; 167 SDValue LowerReturn_64(SDValue Chain, CallingConv::ID CallConv, 168 bool IsVarArg, 169 const SmallVectorImpl<ISD::OutputArg> &Outs, 170 const SmallVectorImpl<SDValue> &OutVals, 171 const SDLoc &DL, SelectionDAG &DAG) const; 172 173 SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const; 174 SDValue LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const; 175 SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) const; 176 SDValue LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const; 177 178 SDValue withTargetFlags(SDValue Op, unsigned TF, SelectionDAG &DAG) const; 179 SDValue makeHiLoPair(SDValue Op, unsigned HiTF, unsigned LoTF, 180 SelectionDAG &DAG) const; 181 SDValue makeAddress(SDValue Op, SelectionDAG &DAG) const; 182 183 SDValue LowerF128_LibCallArg(SDValue Chain, ArgListTy &Args, SDValue Arg, 184 const SDLoc &DL, SelectionDAG &DAG) const; 185 SDValue LowerF128Op(SDValue Op, SelectionDAG &DAG, 186 const char *LibFuncName, 187 unsigned numArgs) const; 188 SDValue LowerF128Compare(SDValue LHS, SDValue RHS, unsigned &SPCC, 189 const SDLoc &DL, SelectionDAG &DAG) const; 190 191 SDValue LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG) const; 192 193 SDValue PerformBITCASTCombine(SDNode *N, DAGCombinerInfo &DCI) const; 194 195 SDValue bitcastConstantFPToInt(ConstantFPSDNode *C, const SDLoc &DL, 196 SelectionDAG &DAG) const; 197 198 SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const override; 199 200 bool IsEligibleForTailCallOptimization(CCState &CCInfo, 201 CallLoweringInfo &CLI, 202 MachineFunction &MF) const; 203 ShouldShrinkFPConstant(EVT VT)204 bool ShouldShrinkFPConstant(EVT VT) const override { 205 // Do not shrink FP constpool if VT == MVT::f128. 206 // (ldd, call _Q_fdtoq) is more expensive than two ldds. 207 return VT != MVT::f128; 208 } 209 shouldInsertFencesForAtomic(const Instruction * I)210 bool shouldInsertFencesForAtomic(const Instruction *I) const override { 211 // FIXME: We insert fences for each atomics and generate 212 // sub-optimal code for PSO/TSO. (Approximately nobody uses any 213 // mode but TSO, which makes this even more silly) 214 return true; 215 } 216 217 AtomicExpansionKind shouldExpandAtomicRMWInIR(AtomicRMWInst *AI) const override; 218 219 void ReplaceNodeResults(SDNode *N, 220 SmallVectorImpl<SDValue>& Results, 221 SelectionDAG &DAG) const override; 222 223 MachineBasicBlock *expandSelectCC(MachineInstr &MI, MachineBasicBlock *BB, 224 unsigned BROpcode) const; 225 226 void AdjustInstrPostInstrSelection(MachineInstr &MI, 227 SDNode *Node) const override; 228 }; 229 } // end namespace llvm 230 231 #endif // LLVM_LIB_TARGET_SPARC_SPARCISELLOWERING_H 232