1 //===-- R600ISelLowering.h - R600 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 /// \file 10 /// R600 DAG Lowering interface definition 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_LIB_TARGET_AMDGPU_R600ISELLOWERING_H 15 #define LLVM_LIB_TARGET_AMDGPU_R600ISELLOWERING_H 16 17 #include "AMDGPUISelLowering.h" 18 #include "llvm/CodeGen/MachineFunction.h" 19 20 namespace llvm { 21 22 class R600Subtarget; 23 24 class R600TargetLowering final : public AMDGPUTargetLowering { 25 26 const R600Subtarget *Subtarget; 27 public: 28 R600TargetLowering(const TargetMachine &TM, const R600Subtarget &STI); 29 30 const R600Subtarget *getSubtarget() const; 31 32 MachineBasicBlock * 33 EmitInstrWithCustomInserter(MachineInstr &MI, 34 MachineBasicBlock *BB) const override; 35 SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override; 36 SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const override; 37 void ReplaceNodeResults(SDNode * N, 38 SmallVectorImpl<SDValue> &Results, 39 SelectionDAG &DAG) const override; 40 CCAssignFn *CCAssignFnForCall(CallingConv::ID CC, bool IsVarArg) const; 41 SDValue LowerFormalArguments(SDValue Chain, CallingConv::ID CallConv, 42 bool isVarArg, 43 const SmallVectorImpl<ISD::InputArg> &Ins, 44 const SDLoc &DL, SelectionDAG &DAG, 45 SmallVectorImpl<SDValue> &InVals) const override; 46 EVT getSetCCResultType(const DataLayout &DL, LLVMContext &, 47 EVT VT) const override; 48 49 bool canMergeStoresTo(unsigned AS, EVT MemVT, 50 const MachineFunction &MF) const override; 51 52 bool allowsMisalignedMemoryAccesses( 53 EVT VT, unsigned AS, Align Alignment, 54 MachineMemOperand::Flags Flags = MachineMemOperand::MONone, 55 bool *IsFast = nullptr) const override; 56 57 virtual bool canCombineTruncStore(EVT ValVT, EVT MemVT, 58 bool LegalOperations) const override { 59 // R600 has "custom" lowering for truncating stores despite not supporting 60 // those instructions. If we allow that custom lowering in the DAG combiner 61 // then all truncates are merged into truncating stores, giving worse code 62 // generation. This hook prevents the DAG combiner performing that combine. 63 return isTruncStoreLegal(ValVT, MemVT); 64 } 65 66 private: 67 unsigned Gen; 68 /// Each OpenCL kernel has nine implicit parameters that are stored in the 69 /// first nine dwords of a Vertex Buffer. These implicit parameters are 70 /// lowered to load instructions which retrieve the values from the Vertex 71 /// Buffer. 72 SDValue LowerImplicitParameter(SelectionDAG &DAG, EVT VT, const SDLoc &DL, 73 unsigned DwordOffset) const; 74 75 void lowerImplicitParameter(MachineInstr *MI, MachineBasicBlock &BB, 76 MachineRegisterInfo & MRI, unsigned dword_offset) const; 77 SDValue OptimizeSwizzle(SDValue BuildVector, SDValue Swz[], SelectionDAG &DAG, 78 const SDLoc &DL) const; 79 SDValue vectorToVerticalVector(SelectionDAG &DAG, SDValue Vector) const; 80 81 SDValue lowerFrameIndex(SDValue Op, SelectionDAG &DAG) const; 82 SDValue LowerEXTRACT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) const; 83 SDValue LowerINSERT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) const; 84 SDValue LowerGlobalAddress(AMDGPUMachineFunction *MFI, SDValue Op, 85 SelectionDAG &DAG) const override; 86 SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const; 87 88 SDValue lowerPrivateTruncStore(StoreSDNode *Store, SelectionDAG &DAG) const; 89 SDValue LowerSTORE(SDValue Op, SelectionDAG &DAG) const; 90 SDValue lowerFP_TO_UINT(SDValue Op, SelectionDAG &DAG) const; 91 SDValue lowerFP_TO_SINT(SDValue Op, SelectionDAG &DAG) const; 92 93 SDValue lowerPrivateExtLoad(SDValue Op, SelectionDAG &DAG) const; 94 SDValue LowerLOAD(SDValue Op, SelectionDAG &DAG) const; 95 SDValue LowerBRCOND(SDValue Op, SelectionDAG &DAG) const; 96 SDValue LowerTrig(SDValue Op, SelectionDAG &DAG) const; 97 SDValue LowerShiftParts(SDValue Op, SelectionDAG &DAG) const; 98 SDValue LowerUADDSUBO(SDValue Op, SelectionDAG &DAG, 99 unsigned mainop, unsigned ovf) const; 100 101 SDValue stackPtrToRegIndex(SDValue Ptr, unsigned StackWidth, 102 SelectionDAG &DAG) const; 103 void getStackAddress(unsigned StackWidth, unsigned ElemIdx, 104 unsigned &Channel, unsigned &PtrIncr) const; 105 bool isZero(SDValue Op) const; 106 bool isHWTrueValue(SDValue Op) const; 107 bool isHWFalseValue(SDValue Op) const; 108 109 bool FoldOperand(SDNode *ParentNode, unsigned SrcIdx, SDValue &Src, 110 SDValue &Neg, SDValue &Abs, SDValue &Sel, SDValue &Imm, 111 SelectionDAG &DAG) const; 112 SDValue constBufferLoad(LoadSDNode *LoadNode, int Block, 113 SelectionDAG &DAG) const; 114 115 SDNode *PostISelFolding(MachineSDNode *N, SelectionDAG &DAG) const override; 116 }; 117 118 } // End namespace llvm; 119 120 #endif 121