1 //===-- AArch64TargetParser - Parser for AArch64 features -------*- 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 implements a target parser to recognise AArch64 hardware features
10 // such as FPU/CPU/ARCH and extension names.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "llvm/Support/AArch64TargetParser.h"
15 #include "llvm/ADT/StringRef.h"
16 #include "llvm/ADT/StringSwitch.h"
17 #include <cctype>
18
19 using namespace llvm;
20
checkArchVersion(llvm::StringRef Arch)21 static unsigned checkArchVersion(llvm::StringRef Arch) {
22 if (Arch.size() >= 2 && Arch[0] == 'v' && std::isdigit(Arch[1]))
23 return (Arch[1] - 48);
24 return 0;
25 }
26
getDefaultFPU(StringRef CPU,AArch64::ArchKind AK)27 unsigned AArch64::getDefaultFPU(StringRef CPU, AArch64::ArchKind AK) {
28 if (CPU == "generic")
29 return AArch64ARCHNames[static_cast<unsigned>(AK)].DefaultFPU;
30
31 return StringSwitch<unsigned>(CPU)
32 #define AARCH64_CPU_NAME(NAME, ID, DEFAULT_FPU, IS_DEFAULT, DEFAULT_EXT) \
33 .Case(NAME, ARM::DEFAULT_FPU)
34 #include "../../include/llvm/Support/AArch64TargetParser.def"
35 .Default(ARM::FK_INVALID);
36 }
37
getDefaultExtensions(StringRef CPU,AArch64::ArchKind AK)38 unsigned AArch64::getDefaultExtensions(StringRef CPU, AArch64::ArchKind AK) {
39 if (CPU == "generic")
40 return AArch64ARCHNames[static_cast<unsigned>(AK)].ArchBaseExtensions;
41
42 return StringSwitch<unsigned>(CPU)
43 #define AARCH64_CPU_NAME(NAME, ID, DEFAULT_FPU, IS_DEFAULT, DEFAULT_EXT) \
44 .Case(NAME, AArch64ARCHNames[static_cast<unsigned>(ArchKind::ID)] \
45 .ArchBaseExtensions | \
46 DEFAULT_EXT)
47 #include "../../include/llvm/Support/AArch64TargetParser.def"
48 .Default(AArch64::AEK_INVALID);
49 }
50
getCPUArchKind(StringRef CPU)51 AArch64::ArchKind AArch64::getCPUArchKind(StringRef CPU) {
52 if (CPU == "generic")
53 return ArchKind::ARMV8A;
54
55 return StringSwitch<AArch64::ArchKind>(CPU)
56 #define AARCH64_CPU_NAME(NAME, ID, DEFAULT_FPU, IS_DEFAULT, DEFAULT_EXT) \
57 .Case(NAME, ArchKind::ID)
58 #include "../../include/llvm/Support/AArch64TargetParser.def"
59 .Default(ArchKind::INVALID);
60 }
61
getExtensionFeatures(unsigned Extensions,std::vector<StringRef> & Features)62 bool AArch64::getExtensionFeatures(unsigned Extensions,
63 std::vector<StringRef> &Features) {
64 if (Extensions == AArch64::AEK_INVALID)
65 return false;
66
67 if (Extensions & AEK_FP)
68 Features.push_back("+fp-armv8");
69 if (Extensions & AEK_SIMD)
70 Features.push_back("+neon");
71 if (Extensions & AEK_CRC)
72 Features.push_back("+crc");
73 if (Extensions & AEK_CRYPTO)
74 Features.push_back("+crypto");
75 if (Extensions & AEK_DOTPROD)
76 Features.push_back("+dotprod");
77 if (Extensions & AEK_FP16FML)
78 Features.push_back("+fp16fml");
79 if (Extensions & AEK_FP16)
80 Features.push_back("+fullfp16");
81 if (Extensions & AEK_PROFILE)
82 Features.push_back("+spe");
83 if (Extensions & AEK_RAS)
84 Features.push_back("+ras");
85 if (Extensions & AEK_LSE)
86 Features.push_back("+lse");
87 if (Extensions & AEK_RDM)
88 Features.push_back("+rdm");
89 if (Extensions & AEK_SVE)
90 Features.push_back("+sve");
91 if (Extensions & AEK_SVE2)
92 Features.push_back("+sve2");
93 if (Extensions & AEK_SVE2AES)
94 Features.push_back("+sve2-aes");
95 if (Extensions & AEK_SVE2SM4)
96 Features.push_back("+sve2-sm4");
97 if (Extensions & AEK_SVE2SHA3)
98 Features.push_back("+sve2-sha3");
99 if (Extensions & AEK_SVE2BITPERM)
100 Features.push_back("+sve2-bitperm");
101 if (Extensions & AEK_RCPC)
102 Features.push_back("+rcpc");
103
104 return true;
105 }
106
getArchFeatures(AArch64::ArchKind AK,std::vector<StringRef> & Features)107 bool AArch64::getArchFeatures(AArch64::ArchKind AK,
108 std::vector<StringRef> &Features) {
109 if (AK == ArchKind::ARMV8_1A)
110 Features.push_back("+v8.1a");
111 if (AK == ArchKind::ARMV8_2A)
112 Features.push_back("+v8.2a");
113 if (AK == ArchKind::ARMV8_3A)
114 Features.push_back("+v8.3a");
115 if (AK == ArchKind::ARMV8_4A)
116 Features.push_back("+v8.4a");
117 if (AK == ArchKind::ARMV8_5A)
118 Features.push_back("+v8.5a");
119
120 return AK != ArchKind::INVALID;
121 }
122
getArchName(AArch64::ArchKind AK)123 StringRef AArch64::getArchName(AArch64::ArchKind AK) {
124 return AArch64ARCHNames[static_cast<unsigned>(AK)].getName();
125 }
126
getCPUAttr(AArch64::ArchKind AK)127 StringRef AArch64::getCPUAttr(AArch64::ArchKind AK) {
128 return AArch64ARCHNames[static_cast<unsigned>(AK)].getCPUAttr();
129 }
130
getSubArch(AArch64::ArchKind AK)131 StringRef AArch64::getSubArch(AArch64::ArchKind AK) {
132 return AArch64ARCHNames[static_cast<unsigned>(AK)].getSubArch();
133 }
134
getArchAttr(AArch64::ArchKind AK)135 unsigned AArch64::getArchAttr(AArch64::ArchKind AK) {
136 return AArch64ARCHNames[static_cast<unsigned>(AK)].ArchAttr;
137 }
138
getArchExtName(unsigned ArchExtKind)139 StringRef AArch64::getArchExtName(unsigned ArchExtKind) {
140 for (const auto &AE : AArch64ARCHExtNames)
141 if (ArchExtKind == AE.ID)
142 return AE.getName();
143 return StringRef();
144 }
145
getArchExtFeature(StringRef ArchExt)146 StringRef AArch64::getArchExtFeature(StringRef ArchExt) {
147 if (ArchExt.startswith("no")) {
148 StringRef ArchExtBase(ArchExt.substr(2));
149 for (const auto &AE : AArch64ARCHExtNames) {
150 if (AE.NegFeature && ArchExtBase == AE.getName())
151 return StringRef(AE.NegFeature);
152 }
153 }
154
155 for (const auto &AE : AArch64ARCHExtNames)
156 if (AE.Feature && ArchExt == AE.getName())
157 return StringRef(AE.Feature);
158 return StringRef();
159 }
160
getDefaultCPU(StringRef Arch)161 StringRef AArch64::getDefaultCPU(StringRef Arch) {
162 ArchKind AK = parseArch(Arch);
163 if (AK == ArchKind::INVALID)
164 return StringRef();
165
166 // Look for multiple AKs to find the default for pair AK+Name.
167 for (const auto &CPU : AArch64CPUNames)
168 if (CPU.ArchID == AK && CPU.Default)
169 return CPU.getName();
170
171 // If we can't find a default then target the architecture instead
172 return "generic";
173 }
174
fillValidCPUArchList(SmallVectorImpl<StringRef> & Values)175 void AArch64::fillValidCPUArchList(SmallVectorImpl<StringRef> &Values) {
176 for (const auto &Arch : AArch64CPUNames) {
177 if (Arch.ArchID != ArchKind::INVALID)
178 Values.push_back(Arch.getName());
179 }
180 }
181
isX18ReservedByDefault(const Triple & TT)182 bool AArch64::isX18ReservedByDefault(const Triple &TT) {
183 return TT.isAndroid() || TT.isOSDarwin() || TT.isOSFuchsia() ||
184 TT.isOSWindows();
185 }
186
187 // Allows partial match, ex. "v8a" matches "armv8a".
parseArch(StringRef Arch)188 AArch64::ArchKind AArch64::parseArch(StringRef Arch) {
189 Arch = ARM::getCanonicalArchName(Arch);
190 if (checkArchVersion(Arch) < 8)
191 return ArchKind::INVALID;
192
193 StringRef Syn = ARM::getArchSynonym(Arch);
194 for (const auto A : AArch64ARCHNames) {
195 if (A.getName().endswith(Syn))
196 return A.ID;
197 }
198 return ArchKind::INVALID;
199 }
200
parseArchExt(StringRef ArchExt)201 AArch64::ArchExtKind AArch64::parseArchExt(StringRef ArchExt) {
202 for (const auto A : AArch64ARCHExtNames) {
203 if (ArchExt == A.getName())
204 return static_cast<ArchExtKind>(A.ID);
205 }
206 return AArch64::AEK_INVALID;
207 }
208
parseCPUArch(StringRef CPU)209 AArch64::ArchKind AArch64::parseCPUArch(StringRef CPU) {
210 for (const auto C : AArch64CPUNames) {
211 if (CPU == C.getName())
212 return C.ArchID;
213 }
214 return ArchKind::INVALID;
215 }
216
217 // Parse a branch protection specification, which has the form
218 // standard | none | [bti,pac-ret[+b-key,+leaf]*]
219 // Returns true on success, with individual elements of the specification
220 // returned in `PBP`. Returns false in error, with `Err` containing
221 // an erroneous part of the spec.
parseBranchProtection(StringRef Spec,ParsedBranchProtection & PBP,StringRef & Err)222 bool AArch64::parseBranchProtection(StringRef Spec, ParsedBranchProtection &PBP,
223 StringRef &Err) {
224 PBP = {"none", "a_key", false};
225 if (Spec == "none")
226 return true; // defaults are ok
227
228 if (Spec == "standard") {
229 PBP.Scope = "non-leaf";
230 PBP.BranchTargetEnforcement = true;
231 return true;
232 }
233
234 SmallVector<StringRef, 4> Opts;
235 Spec.split(Opts, "+");
236 for (int I = 0, E = Opts.size(); I != E; ++I) {
237 StringRef Opt = Opts[I].trim();
238 if (Opt == "bti") {
239 PBP.BranchTargetEnforcement = true;
240 continue;
241 }
242 if (Opt == "pac-ret") {
243 PBP.Scope = "non-leaf";
244 for (; I + 1 != E; ++I) {
245 StringRef PACOpt = Opts[I + 1].trim();
246 if (PACOpt == "leaf")
247 PBP.Scope = "all";
248 else if (PACOpt == "b-key")
249 PBP.Key = "b_key";
250 else
251 break;
252 }
253 continue;
254 }
255 if (Opt == "")
256 Err = "<empty>";
257 else
258 Err = Opt;
259 return false;
260 }
261
262 return true;
263 }
264