1 //===- XtensaISelLowering.h - Xtensa 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 Xtensa uses to lower LLVM code into a 10 // selection DAG. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_LIB_TARGET_XTENSA_XTENSAISELLOWERING_H 15 #define LLVM_LIB_TARGET_XTENSA_XTENSAISELLOWERING_H 16 17 #include "llvm/CodeGen/CallingConvLower.h" 18 #include "llvm/CodeGen/SelectionDAG.h" 19 #include "llvm/CodeGen/TargetLowering.h" 20 21 namespace llvm { 22 23 namespace XtensaISD { 24 enum { 25 FIRST_NUMBER = ISD::BUILTIN_OP_END, 26 BR_JT, 27 28 // Calls a function. Operand 0 is the chain operand and operand 1 29 // is the target address. The arguments start at operand 2. 30 // There is an optional glue operand at the end. 31 CALL, 32 33 // Wraps a TargetGlobalAddress that should be loaded using PC-relative 34 // accesses. Operand 0 is the address. 35 PCREL_WRAPPER, 36 RET, 37 38 // Select with condition operator - This selects between a true value and 39 // a false value (ops #2 and #3) based on the boolean result of comparing 40 // the lhs and rhs (ops #0 and #1) of a conditional expression with the 41 // condition code in op #4 42 SELECT_CC, 43 }; 44 } 45 46 class XtensaSubtarget; 47 48 class XtensaTargetLowering : public TargetLowering { 49 public: 50 explicit XtensaTargetLowering(const TargetMachine &TM, 51 const XtensaSubtarget &STI); 52 53 EVT getSetCCResultType(const DataLayout &, LLVMContext &, 54 EVT VT) const override { 55 if (!VT.isVector()) 56 return MVT::i32; 57 return VT.changeVectorElementTypeToInteger(); 58 } 59 60 bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const override; 61 62 const char *getTargetNodeName(unsigned Opcode) const override; 63 64 SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override; 65 66 SDValue LowerFormalArguments(SDValue Chain, CallingConv::ID CallConv, 67 bool isVarArg, 68 const SmallVectorImpl<ISD::InputArg> &Ins, 69 const SDLoc &DL, SelectionDAG &DAG, 70 SmallVectorImpl<SDValue> &InVals) const override; 71 72 SDValue LowerCall(CallLoweringInfo &CLI, 73 SmallVectorImpl<SDValue> &InVals) const override; 74 75 bool CanLowerReturn(CallingConv::ID CallConv, MachineFunction &MF, 76 bool isVarArg, 77 const SmallVectorImpl<ISD::OutputArg> &Outs, 78 LLVMContext &Context) const override; 79 80 SDValue LowerReturn(SDValue Chain, CallingConv::ID CallConv, bool IsVarArg, 81 const SmallVectorImpl<ISD::OutputArg> &Outs, 82 const SmallVectorImpl<SDValue> &OutVals, const SDLoc &DL, 83 SelectionDAG &DAG) const override; 84 85 const XtensaSubtarget &getSubtarget() const { return Subtarget; } 86 87 MachineBasicBlock * 88 EmitInstrWithCustomInserter(MachineInstr &MI, 89 MachineBasicBlock *BB) const override; 90 91 private: 92 const XtensaSubtarget &Subtarget; 93 94 SDValue LowerBR_JT(SDValue Op, SelectionDAG &DAG) const; 95 96 SDValue LowerImmediate(SDValue Op, SelectionDAG &DAG) const; 97 98 SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const; 99 100 SDValue LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const; 101 102 SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) const; 103 104 SDValue LowerConstantPool(ConstantPoolSDNode *CP, SelectionDAG &DAG) const; 105 106 SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const; 107 108 SDValue LowerDYNAMIC_STACKALLOC(SDValue Op, SelectionDAG &DAG) const; 109 110 SDValue LowerSTACKSAVE(SDValue Op, SelectionDAG &DAG) const; 111 112 SDValue LowerSTACKRESTORE(SDValue Op, SelectionDAG &DAG) const; 113 114 SDValue getAddrPCRel(SDValue Op, SelectionDAG &DAG) const; 115 116 CCAssignFn *CCAssignFnForCall(CallingConv::ID CC, bool IsVarArg) const; 117 118 MachineBasicBlock *emitSelectCC(MachineInstr &MI, 119 MachineBasicBlock *BB) const; 120 }; 121 122 } // end namespace llvm 123 124 #endif /* LLVM_LIB_TARGET_XTENSA_XTENSAISELLOWERING_H */ 125