1//===-- AArch64SelectionDAGInfo.cpp - AArch64 SelectionDAG Info -----------===//
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 implements the AArch64SelectionDAGInfo class.
10//
11//===----------------------------------------------------------------------===//
12
13#include "AArch64TargetMachine.h"
14using namespace llvm;
15
16#define DEBUG_TYPE "aarch64-selectiondag-info"
17
18static cl::opt<bool>
19 LowerToSMERoutines("aarch64-lower-to-sme-routines", cl::Hidden,
20 cl::desc("Enable AArch64 SME memory operations "
21 "to lower to librt functions"),
22 cl::init(Val: true));
23
24SDValue AArch64SelectionDAGInfo::EmitMOPS(AArch64ISD::NodeType SDOpcode,
25 SelectionDAG &DAG, const SDLoc &DL,
26 SDValue Chain, SDValue Dst,
27 SDValue SrcOrValue, SDValue Size,
28 Align Alignment, bool isVolatile,
29 MachinePointerInfo DstPtrInfo,
30 MachinePointerInfo SrcPtrInfo) const {
31
32 // Get the constant size of the copy/set.
33 uint64_t ConstSize = 0;
34 if (auto *C = dyn_cast<ConstantSDNode>(Val&: Size))
35 ConstSize = C->getZExtValue();
36
37 const bool IsSet = SDOpcode == AArch64ISD::MOPS_MEMSET ||
38 SDOpcode == AArch64ISD::MOPS_MEMSET_TAGGING;
39
40 const auto MachineOpcode = [&]() {
41 switch (SDOpcode) {
42 case AArch64ISD::MOPS_MEMSET:
43 return AArch64::MOPSMemorySetPseudo;
44 case AArch64ISD::MOPS_MEMSET_TAGGING:
45 return AArch64::MOPSMemorySetTaggingPseudo;
46 case AArch64ISD::MOPS_MEMCOPY:
47 return AArch64::MOPSMemoryCopyPseudo;
48 case AArch64ISD::MOPS_MEMMOVE:
49 return AArch64::MOPSMemoryMovePseudo;
50 default:
51 llvm_unreachable("Unhandled MOPS ISD Opcode");
52 }
53 }();
54
55 MachineFunction &MF = DAG.getMachineFunction();
56
57 auto Vol =
58 isVolatile ? MachineMemOperand::MOVolatile : MachineMemOperand::MONone;
59 auto DstFlags = MachineMemOperand::MOStore | Vol;
60 auto *DstOp =
61 MF.getMachineMemOperand(PtrInfo: DstPtrInfo, F: DstFlags, Size: ConstSize, BaseAlignment: Alignment);
62
63 if (IsSet) {
64 // Extend value to i64, if required.
65 if (SrcOrValue.getValueType() != MVT::i64)
66 SrcOrValue = DAG.getNode(Opcode: ISD::ANY_EXTEND, DL, VT: MVT::i64, Operand: SrcOrValue);
67 SDValue Ops[] = {Dst, Size, SrcOrValue, Chain};
68 const EVT ResultTys[] = {MVT::i64, MVT::i64, MVT::Other};
69 MachineSDNode *Node = DAG.getMachineNode(Opcode: MachineOpcode, dl: DL, ResultTys, Ops);
70 DAG.setNodeMemRefs(N: Node, NewMemRefs: {DstOp});
71 return SDValue(Node, 2);
72 } else {
73 SDValue Ops[] = {Dst, SrcOrValue, Size, Chain};
74 const EVT ResultTys[] = {MVT::i64, MVT::i64, MVT::i64, MVT::Other};
75 MachineSDNode *Node = DAG.getMachineNode(Opcode: MachineOpcode, dl: DL, ResultTys, Ops);
76
77 auto SrcFlags = MachineMemOperand::MOLoad | Vol;
78 auto *SrcOp =
79 MF.getMachineMemOperand(PtrInfo: SrcPtrInfo, F: SrcFlags, Size: ConstSize, BaseAlignment: Alignment);
80 DAG.setNodeMemRefs(N: Node, NewMemRefs: {DstOp, SrcOp});
81 return SDValue(Node, 3);
82 }
83}
84
85SDValue AArch64SelectionDAGInfo::EmitStreamingCompatibleMemLibCall(
86 SelectionDAG &DAG, const SDLoc &DL, SDValue Chain, SDValue Dst, SDValue Src,
87 SDValue Size, RTLIB::Libcall LC) const {
88 const AArch64Subtarget &STI =
89 DAG.getMachineFunction().getSubtarget<AArch64Subtarget>();
90 const AArch64TargetLowering *TLI = STI.getTargetLowering();
91 SDValue Symbol;
92 TargetLowering::ArgListEntry DstEntry;
93 DstEntry.Ty = PointerType::getUnqual(C&: *DAG.getContext());
94 DstEntry.Node = Dst;
95 TargetLowering::ArgListTy Args;
96 Args.push_back(x: DstEntry);
97 EVT PointerVT = TLI->getPointerTy(DL: DAG.getDataLayout());
98
99 switch (LC) {
100 case RTLIB::MEMCPY: {
101 TargetLowering::ArgListEntry Entry;
102 Entry.Ty = PointerType::getUnqual(C&: *DAG.getContext());
103 Symbol = DAG.getExternalSymbol(Sym: "__arm_sc_memcpy", VT: PointerVT);
104 Entry.Node = Src;
105 Args.push_back(x: Entry);
106 break;
107 }
108 case RTLIB::MEMMOVE: {
109 TargetLowering::ArgListEntry Entry;
110 Entry.Ty = PointerType::getUnqual(C&: *DAG.getContext());
111 Symbol = DAG.getExternalSymbol(Sym: "__arm_sc_memmove", VT: PointerVT);
112 Entry.Node = Src;
113 Args.push_back(x: Entry);
114 break;
115 }
116 case RTLIB::MEMSET: {
117 TargetLowering::ArgListEntry Entry;
118 Entry.Ty = Type::getInt32Ty(C&: *DAG.getContext());
119 Symbol = DAG.getExternalSymbol(Sym: "__arm_sc_memset", VT: PointerVT);
120 Src = DAG.getZExtOrTrunc(Op: Src, DL, VT: MVT::i32);
121 Entry.Node = Src;
122 Args.push_back(x: Entry);
123 break;
124 }
125 default:
126 return SDValue();
127 }
128
129 TargetLowering::ArgListEntry SizeEntry;
130 SizeEntry.Node = Size;
131 SizeEntry.Ty = DAG.getDataLayout().getIntPtrType(C&: *DAG.getContext());
132 Args.push_back(x: SizeEntry);
133 assert(Symbol->getOpcode() == ISD::ExternalSymbol &&
134 "Function name is not set");
135
136 TargetLowering::CallLoweringInfo CLI(DAG);
137 PointerType *RetTy = PointerType::getUnqual(C&: *DAG.getContext());
138 CLI.setDebugLoc(DL).setChain(Chain).setLibCallee(
139 CC: TLI->getLibcallCallingConv(Call: LC), ResultType: RetTy, Target: Symbol, ArgsList: std::move(Args));
140 return TLI->LowerCallTo(CLI).second;
141}
142
143SDValue AArch64SelectionDAGInfo::EmitTargetCodeForMemcpy(
144 SelectionDAG &DAG, const SDLoc &DL, SDValue Chain, SDValue Dst, SDValue Src,
145 SDValue Size, Align Alignment, bool isVolatile, bool AlwaysInline,
146 MachinePointerInfo DstPtrInfo, MachinePointerInfo SrcPtrInfo) const {
147 const AArch64Subtarget &STI =
148 DAG.getMachineFunction().getSubtarget<AArch64Subtarget>();
149
150 if (STI.hasMOPS())
151 return EmitMOPS(SDOpcode: AArch64ISD::MOPS_MEMCOPY, DAG, DL, Chain, Dst, SrcOrValue: Src, Size,
152 Alignment, isVolatile, DstPtrInfo, SrcPtrInfo);
153
154 SMEAttrs Attrs(DAG.getMachineFunction().getFunction());
155 if (LowerToSMERoutines && !Attrs.hasNonStreamingInterfaceAndBody())
156 return EmitStreamingCompatibleMemLibCall(DAG, DL, Chain, Dst, Src, Size,
157 LC: RTLIB::MEMCPY);
158 return SDValue();
159}
160
161SDValue AArch64SelectionDAGInfo::EmitTargetCodeForMemset(
162 SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Dst, SDValue Src,
163 SDValue Size, Align Alignment, bool isVolatile, bool AlwaysInline,
164 MachinePointerInfo DstPtrInfo) const {
165 const AArch64Subtarget &STI =
166 DAG.getMachineFunction().getSubtarget<AArch64Subtarget>();
167
168 if (STI.hasMOPS())
169 return EmitMOPS(SDOpcode: AArch64ISD::MOPS_MEMSET, DAG, DL: dl, Chain, Dst, SrcOrValue: Src, Size,
170 Alignment, isVolatile, DstPtrInfo, SrcPtrInfo: MachinePointerInfo{});
171
172 SMEAttrs Attrs(DAG.getMachineFunction().getFunction());
173 if (LowerToSMERoutines && !Attrs.hasNonStreamingInterfaceAndBody())
174 return EmitStreamingCompatibleMemLibCall(DAG, DL: dl, Chain, Dst, Src, Size,
175 LC: RTLIB::MEMSET);
176 return SDValue();
177}
178
179SDValue AArch64SelectionDAGInfo::EmitTargetCodeForMemmove(
180 SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Dst, SDValue Src,
181 SDValue Size, Align Alignment, bool isVolatile,
182 MachinePointerInfo DstPtrInfo, MachinePointerInfo SrcPtrInfo) const {
183 const AArch64Subtarget &STI =
184 DAG.getMachineFunction().getSubtarget<AArch64Subtarget>();
185
186 if (STI.hasMOPS())
187 return EmitMOPS(SDOpcode: AArch64ISD::MOPS_MEMMOVE, DAG, DL: dl, Chain, Dst, SrcOrValue: Src, Size,
188 Alignment, isVolatile, DstPtrInfo, SrcPtrInfo);
189
190 SMEAttrs Attrs(DAG.getMachineFunction().getFunction());
191 if (LowerToSMERoutines && !Attrs.hasNonStreamingInterfaceAndBody())
192 return EmitStreamingCompatibleMemLibCall(DAG, DL: dl, Chain, Dst, Src, Size,
193 LC: RTLIB::MEMMOVE);
194 return SDValue();
195}
196
197static const int kSetTagLoopThreshold = 176;
198
199static SDValue EmitUnrolledSetTag(SelectionDAG &DAG, const SDLoc &dl,
200 SDValue Chain, SDValue Ptr, uint64_t ObjSize,
201 const MachineMemOperand *BaseMemOperand,
202 bool ZeroData) {
203 MachineFunction &MF = DAG.getMachineFunction();
204 unsigned ObjSizeScaled = ObjSize / 16;
205
206 SDValue TagSrc = Ptr;
207 if (Ptr.getOpcode() == ISD::FrameIndex) {
208 int FI = cast<FrameIndexSDNode>(Val&: Ptr)->getIndex();
209 Ptr = DAG.getTargetFrameIndex(FI, VT: MVT::i64);
210 // A frame index operand may end up as [SP + offset] => it is fine to use SP
211 // register as the tag source.
212 TagSrc = DAG.getRegister(Reg: AArch64::SP, VT: MVT::i64);
213 }
214
215 const unsigned OpCode1 = ZeroData ? AArch64ISD::STZG : AArch64ISD::STG;
216 const unsigned OpCode2 = ZeroData ? AArch64ISD::STZ2G : AArch64ISD::ST2G;
217
218 SmallVector<SDValue, 8> OutChains;
219 unsigned OffsetScaled = 0;
220 while (OffsetScaled < ObjSizeScaled) {
221 if (ObjSizeScaled - OffsetScaled >= 2) {
222 SDValue AddrNode = DAG.getMemBasePlusOffset(
223 Base: Ptr, Offset: TypeSize::getFixed(ExactSize: OffsetScaled * 16), DL: dl);
224 SDValue St = DAG.getMemIntrinsicNode(
225 Opcode: OpCode2, dl, VTList: DAG.getVTList(VT: MVT::Other),
226 Ops: {Chain, TagSrc, AddrNode},
227 MemVT: MVT::v4i64,
228 MMO: MF.getMachineMemOperand(MMO: BaseMemOperand, Offset: OffsetScaled * 16, Size: 16 * 2));
229 OffsetScaled += 2;
230 OutChains.push_back(Elt: St);
231 continue;
232 }
233
234 if (ObjSizeScaled - OffsetScaled > 0) {
235 SDValue AddrNode = DAG.getMemBasePlusOffset(
236 Base: Ptr, Offset: TypeSize::getFixed(ExactSize: OffsetScaled * 16), DL: dl);
237 SDValue St = DAG.getMemIntrinsicNode(
238 Opcode: OpCode1, dl, VTList: DAG.getVTList(VT: MVT::Other),
239 Ops: {Chain, TagSrc, AddrNode},
240 MemVT: MVT::v2i64,
241 MMO: MF.getMachineMemOperand(MMO: BaseMemOperand, Offset: OffsetScaled * 16, Size: 16));
242 OffsetScaled += 1;
243 OutChains.push_back(Elt: St);
244 }
245 }
246
247 SDValue Res = DAG.getNode(Opcode: ISD::TokenFactor, DL: dl, VT: MVT::Other, Ops: OutChains);
248 return Res;
249}
250
251SDValue AArch64SelectionDAGInfo::EmitTargetCodeForSetTag(
252 SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Addr,
253 SDValue Size, MachinePointerInfo DstPtrInfo, bool ZeroData) const {
254 uint64_t ObjSize = Size->getAsZExtVal();
255 assert(ObjSize % 16 == 0);
256
257 MachineFunction &MF = DAG.getMachineFunction();
258 MachineMemOperand *BaseMemOperand = MF.getMachineMemOperand(
259 PtrInfo: DstPtrInfo, F: MachineMemOperand::MOStore, Size: ObjSize, BaseAlignment: Align(16));
260
261 bool UseSetTagRangeLoop =
262 kSetTagLoopThreshold >= 0 && (int)ObjSize >= kSetTagLoopThreshold;
263 if (!UseSetTagRangeLoop)
264 return EmitUnrolledSetTag(DAG, dl, Chain, Ptr: Addr, ObjSize, BaseMemOperand,
265 ZeroData);
266
267 const EVT ResTys[] = {MVT::i64, MVT::i64, MVT::Other};
268
269 unsigned Opcode;
270 if (Addr.getOpcode() == ISD::FrameIndex) {
271 int FI = cast<FrameIndexSDNode>(Val&: Addr)->getIndex();
272 Addr = DAG.getTargetFrameIndex(FI, VT: MVT::i64);
273 Opcode = ZeroData ? AArch64::STZGloop : AArch64::STGloop;
274 } else {
275 Opcode = ZeroData ? AArch64::STZGloop_wback : AArch64::STGloop_wback;
276 }
277 SDValue Ops[] = {DAG.getTargetConstant(Val: ObjSize, DL: dl, VT: MVT::i64), Addr, Chain};
278 SDNode *St = DAG.getMachineNode(Opcode, dl, ResultTys: ResTys, Ops);
279
280 DAG.setNodeMemRefs(N: cast<MachineSDNode>(Val: St), NewMemRefs: {BaseMemOperand});
281 return SDValue(St, 2);
282}
283