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
20namespace 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;
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
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
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
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
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

source code of llvm/lib/Target/Sparc/SparcISelLowering.h