1 //===-- ARMTargetParser - Parser for ARM target 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 ARM hardware features
10 // such as FPU/CPU/ARCH/extensions and specific support such as HWDIV.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "llvm/Support/ARMTargetParser.h"
15 #include "llvm/ADT/StringSwitch.h"
16 #include "llvm/ADT/Triple.h"
17 #include <cctype>
18 
19 using namespace llvm;
20 
21 static StringRef getHWDivSynonym(StringRef HWDiv) {
22   return StringSwitch<StringRef>(HWDiv)
23       .Case("thumb,arm", "arm,thumb")
24       .Default(HWDiv);
25 }
26 
27 // Allows partial match, ex. "v7a" matches "armv7a".
28 ARM::ArchKind ARM::parseArch(StringRef Arch) {
29   Arch = getCanonicalArchName(Arch);
30   StringRef Syn = getArchSynonym(Arch);
31   for (const auto &A : ARCHNames) {
32     if (A.getName().endswith(Syn))
33       return A.ID;
34   }
35   return ArchKind::INVALID;
36 }
37 
38 // Version number (ex. v7 = 7).
39 unsigned ARM::parseArchVersion(StringRef Arch) {
40   Arch = getCanonicalArchName(Arch);
41   switch (parseArch(Arch)) {
42   case ArchKind::ARMV2:
43   case ArchKind::ARMV2A:
44     return 2;
45   case ArchKind::ARMV3:
46   case ArchKind::ARMV3M:
47     return 3;
48   case ArchKind::ARMV4:
49   case ArchKind::ARMV4T:
50     return 4;
51   case ArchKind::ARMV5T:
52   case ArchKind::ARMV5TE:
53   case ArchKind::IWMMXT:
54   case ArchKind::IWMMXT2:
55   case ArchKind::XSCALE:
56   case ArchKind::ARMV5TEJ:
57     return 5;
58   case ArchKind::ARMV6:
59   case ArchKind::ARMV6K:
60   case ArchKind::ARMV6T2:
61   case ArchKind::ARMV6KZ:
62   case ArchKind::ARMV6M:
63     return 6;
64   case ArchKind::ARMV7A:
65   case ArchKind::ARMV7VE:
66   case ArchKind::ARMV7R:
67   case ArchKind::ARMV7M:
68   case ArchKind::ARMV7S:
69   case ArchKind::ARMV7EM:
70   case ArchKind::ARMV7K:
71     return 7;
72   case ArchKind::ARMV8A:
73   case ArchKind::ARMV8_1A:
74   case ArchKind::ARMV8_2A:
75   case ArchKind::ARMV8_3A:
76   case ArchKind::ARMV8_4A:
77   case ArchKind::ARMV8_5A:
78   case ArchKind::ARMV8_6A:
79   case ArchKind::ARMV8_7A:
80   case ArchKind::ARMV8_8A:
81   case ArchKind::ARMV8R:
82   case ArchKind::ARMV8MBaseline:
83   case ArchKind::ARMV8MMainline:
84   case ArchKind::ARMV8_1MMainline:
85     return 8;
86   case ArchKind::ARMV9A:
87   case ArchKind::ARMV9_1A:
88   case ArchKind::ARMV9_2A:
89   case ArchKind::ARMV9_3A:
90     return 9;
91   case ArchKind::INVALID:
92     return 0;
93   }
94   llvm_unreachable("Unhandled architecture");
95 }
96 
97 // Profile A/R/M
98 ARM::ProfileKind ARM::parseArchProfile(StringRef Arch) {
99   Arch = getCanonicalArchName(Arch);
100   switch (parseArch(Arch)) {
101   case ArchKind::ARMV6M:
102   case ArchKind::ARMV7M:
103   case ArchKind::ARMV7EM:
104   case ArchKind::ARMV8MMainline:
105   case ArchKind::ARMV8MBaseline:
106   case ArchKind::ARMV8_1MMainline:
107     return ProfileKind::M;
108   case ArchKind::ARMV7R:
109   case ArchKind::ARMV8R:
110     return ProfileKind::R;
111   case ArchKind::ARMV7A:
112   case ArchKind::ARMV7VE:
113   case ArchKind::ARMV7K:
114   case ArchKind::ARMV8A:
115   case ArchKind::ARMV8_1A:
116   case ArchKind::ARMV8_2A:
117   case ArchKind::ARMV8_3A:
118   case ArchKind::ARMV8_4A:
119   case ArchKind::ARMV8_5A:
120   case ArchKind::ARMV8_6A:
121   case ArchKind::ARMV8_7A:
122   case ArchKind::ARMV8_8A:
123   case ArchKind::ARMV9A:
124   case ArchKind::ARMV9_1A:
125   case ArchKind::ARMV9_2A:
126   case ArchKind::ARMV9_3A:
127     return ProfileKind::A;
128   case ArchKind::ARMV2:
129   case ArchKind::ARMV2A:
130   case ArchKind::ARMV3:
131   case ArchKind::ARMV3M:
132   case ArchKind::ARMV4:
133   case ArchKind::ARMV4T:
134   case ArchKind::ARMV5T:
135   case ArchKind::ARMV5TE:
136   case ArchKind::ARMV5TEJ:
137   case ArchKind::ARMV6:
138   case ArchKind::ARMV6K:
139   case ArchKind::ARMV6T2:
140   case ArchKind::ARMV6KZ:
141   case ArchKind::ARMV7S:
142   case ArchKind::IWMMXT:
143   case ArchKind::IWMMXT2:
144   case ArchKind::XSCALE:
145   case ArchKind::INVALID:
146     return ProfileKind::INVALID;
147   }
148   llvm_unreachable("Unhandled architecture");
149 }
150 
151 StringRef ARM::getArchSynonym(StringRef Arch) {
152   return StringSwitch<StringRef>(Arch)
153       .Case("v5", "v5t")
154       .Case("v5e", "v5te")
155       .Case("v6j", "v6")
156       .Case("v6hl", "v6k")
157       .Cases("v6m", "v6sm", "v6s-m", "v6-m")
158       .Cases("v6z", "v6zk", "v6kz")
159       .Cases("v7", "v7a", "v7hl", "v7l", "v7-a")
160       .Case("v7r", "v7-r")
161       .Case("v7m", "v7-m")
162       .Case("v7em", "v7e-m")
163       .Cases("v8", "v8a", "v8l", "aarch64", "arm64", "v8-a")
164       .Case("v8.1a", "v8.1-a")
165       .Case("v8.2a", "v8.2-a")
166       .Case("v8.3a", "v8.3-a")
167       .Case("v8.4a", "v8.4-a")
168       .Case("v8.5a", "v8.5-a")
169       .Case("v8.6a", "v8.6-a")
170       .Case("v8.7a", "v8.7-a")
171       .Case("v8.8a", "v8.8-a")
172       .Case("v8r", "v8-r")
173       .Cases("v9", "v9a", "v9-a")
174       .Case("v9.1a", "v9.1-a")
175       .Case("v9.2a", "v9.2-a")
176       .Case("v9.3a", "v9.3-a")
177       .Case("v8m.base", "v8-m.base")
178       .Case("v8m.main", "v8-m.main")
179       .Case("v8.1m.main", "v8.1-m.main")
180       .Default(Arch);
181 }
182 
183 bool ARM::getFPUFeatures(unsigned FPUKind, std::vector<StringRef> &Features) {
184 
185   if (FPUKind >= FK_LAST || FPUKind == FK_INVALID)
186     return false;
187 
188   static const struct FPUFeatureNameInfo {
189     const char *PlusName, *MinusName;
190     FPUVersion MinVersion;
191     FPURestriction MaxRestriction;
192   } FPUFeatureInfoList[] = {
193     // We have to specify the + and - versions of the name in full so
194     // that we can return them as static StringRefs.
195     //
196     // Also, the SubtargetFeatures ending in just "sp" are listed here
197     // under FPURestriction::None, which is the only FPURestriction in
198     // which they would be valid (since FPURestriction::SP doesn't
199     // exist).
200     {"+vfp2", "-vfp2", FPUVersion::VFPV2, FPURestriction::D16},
201     {"+vfp2sp", "-vfp2sp", FPUVersion::VFPV2, FPURestriction::SP_D16},
202     {"+vfp3", "-vfp3", FPUVersion::VFPV3, FPURestriction::None},
203     {"+vfp3d16", "-vfp3d16", FPUVersion::VFPV3, FPURestriction::D16},
204     {"+vfp3d16sp", "-vfp3d16sp", FPUVersion::VFPV3, FPURestriction::SP_D16},
205     {"+vfp3sp", "-vfp3sp", FPUVersion::VFPV3, FPURestriction::None},
206     {"+fp16", "-fp16", FPUVersion::VFPV3_FP16, FPURestriction::SP_D16},
207     {"+vfp4", "-vfp4", FPUVersion::VFPV4, FPURestriction::None},
208     {"+vfp4d16", "-vfp4d16", FPUVersion::VFPV4, FPURestriction::D16},
209     {"+vfp4d16sp", "-vfp4d16sp", FPUVersion::VFPV4, FPURestriction::SP_D16},
210     {"+vfp4sp", "-vfp4sp", FPUVersion::VFPV4, FPURestriction::None},
211     {"+fp-armv8", "-fp-armv8", FPUVersion::VFPV5, FPURestriction::None},
212     {"+fp-armv8d16", "-fp-armv8d16", FPUVersion::VFPV5, FPURestriction::D16},
213     {"+fp-armv8d16sp", "-fp-armv8d16sp", FPUVersion::VFPV5, FPURestriction::SP_D16},
214     {"+fp-armv8sp", "-fp-armv8sp", FPUVersion::VFPV5, FPURestriction::None},
215     {"+fullfp16", "-fullfp16", FPUVersion::VFPV5_FULLFP16, FPURestriction::SP_D16},
216     {"+fp64", "-fp64", FPUVersion::VFPV2, FPURestriction::D16},
217     {"+d32", "-d32", FPUVersion::VFPV3, FPURestriction::None},
218   };
219 
220   for (const auto &Info: FPUFeatureInfoList) {
221     if (FPUNames[FPUKind].FPUVer >= Info.MinVersion &&
222         FPUNames[FPUKind].Restriction <= Info.MaxRestriction)
223       Features.push_back(Info.PlusName);
224     else
225       Features.push_back(Info.MinusName);
226   }
227 
228   static const struct NeonFeatureNameInfo {
229     const char *PlusName, *MinusName;
230     NeonSupportLevel MinSupportLevel;
231   } NeonFeatureInfoList[] = {
232       {"+neon", "-neon", NeonSupportLevel::Neon},
233       {"+sha2", "-sha2", NeonSupportLevel::Crypto},
234       {"+aes", "-aes", NeonSupportLevel::Crypto},
235   };
236 
237   for (const auto &Info: NeonFeatureInfoList) {
238     if (FPUNames[FPUKind].NeonSupport >= Info.MinSupportLevel)
239       Features.push_back(Info.PlusName);
240     else
241       Features.push_back(Info.MinusName);
242   }
243 
244   return true;
245 }
246 
247 // Little/Big endian
248 ARM::EndianKind ARM::parseArchEndian(StringRef Arch) {
249   if (Arch.startswith("armeb") || Arch.startswith("thumbeb") ||
250       Arch.startswith("aarch64_be"))
251     return EndianKind::BIG;
252 
253   if (Arch.startswith("arm") || Arch.startswith("thumb")) {
254     if (Arch.endswith("eb"))
255       return EndianKind::BIG;
256     else
257       return EndianKind::LITTLE;
258   }
259 
260   if (Arch.startswith("aarch64") || Arch.startswith("aarch64_32"))
261     return EndianKind::LITTLE;
262 
263   return EndianKind::INVALID;
264 }
265 
266 // ARM, Thumb, AArch64
267 ARM::ISAKind ARM::parseArchISA(StringRef Arch) {
268   return StringSwitch<ISAKind>(Arch)
269       .StartsWith("aarch64", ISAKind::AARCH64)
270       .StartsWith("arm64", ISAKind::AARCH64)
271       .StartsWith("thumb", ISAKind::THUMB)
272       .StartsWith("arm", ISAKind::ARM)
273       .Default(ISAKind::INVALID);
274 }
275 
276 unsigned ARM::parseFPU(StringRef FPU) {
277   StringRef Syn = getFPUSynonym(FPU);
278   for (const auto &F : FPUNames) {
279     if (Syn == F.getName())
280       return F.ID;
281   }
282   return FK_INVALID;
283 }
284 
285 ARM::NeonSupportLevel ARM::getFPUNeonSupportLevel(unsigned FPUKind) {
286   if (FPUKind >= FK_LAST)
287     return NeonSupportLevel::None;
288   return FPUNames[FPUKind].NeonSupport;
289 }
290 
291 // MArch is expected to be of the form (arm|thumb)?(eb)?(v.+)?(eb)?, but
292 // (iwmmxt|xscale)(eb)? is also permitted. If the former, return
293 // "v.+", if the latter, return unmodified string, minus 'eb'.
294 // If invalid, return empty string.
295 StringRef ARM::getCanonicalArchName(StringRef Arch) {
296   size_t offset = StringRef::npos;
297   StringRef A = Arch;
298   StringRef Error = "";
299 
300   // Begins with "arm" / "thumb", move past it.
301   if (A.startswith("arm64_32"))
302     offset = 8;
303   else if (A.startswith("arm64e"))
304     offset = 6;
305   else if (A.startswith("arm64"))
306     offset = 5;
307   else if (A.startswith("aarch64_32"))
308     offset = 10;
309   else if (A.startswith("arm"))
310     offset = 3;
311   else if (A.startswith("thumb"))
312     offset = 5;
313   else if (A.startswith("aarch64")) {
314     offset = 7;
315     // AArch64 uses "_be", not "eb" suffix.
316     if (A.contains("eb"))
317       return Error;
318     if (A.substr(offset, 3) == "_be")
319       offset += 3;
320   }
321 
322   // Ex. "armebv7", move past the "eb".
323   if (offset != StringRef::npos && A.substr(offset, 2) == "eb")
324     offset += 2;
325   // Or, if it ends with eb ("armv7eb"), chop it off.
326   else if (A.endswith("eb"))
327     A = A.substr(0, A.size() - 2);
328   // Trim the head
329   if (offset != StringRef::npos)
330     A = A.substr(offset);
331 
332   // Empty string means offset reached the end, which means it's valid.
333   if (A.empty())
334     return Arch;
335 
336   // Only match non-marketing names
337   if (offset != StringRef::npos) {
338     // Must start with 'vN'.
339     if (A.size() >= 2 && (A[0] != 'v' || !std::isdigit(A[1])))
340       return Error;
341     // Can't have an extra 'eb'.
342     if (A.contains("eb"))
343       return Error;
344   }
345 
346   // Arch will either be a 'v' name (v7a) or a marketing name (xscale).
347   return A;
348 }
349 
350 StringRef ARM::getFPUSynonym(StringRef FPU) {
351   return StringSwitch<StringRef>(FPU)
352       .Cases("fpa", "fpe2", "fpe3", "maverick", "invalid") // Unsupported
353       .Case("vfp2", "vfpv2")
354       .Case("vfp3", "vfpv3")
355       .Case("vfp4", "vfpv4")
356       .Case("vfp3-d16", "vfpv3-d16")
357       .Case("vfp4-d16", "vfpv4-d16")
358       .Cases("fp4-sp-d16", "vfpv4-sp-d16", "fpv4-sp-d16")
359       .Cases("fp4-dp-d16", "fpv4-dp-d16", "vfpv4-d16")
360       .Case("fp5-sp-d16", "fpv5-sp-d16")
361       .Cases("fp5-dp-d16", "fpv5-dp-d16", "fpv5-d16")
362       // FIXME: Clang uses it, but it's bogus, since neon defaults to vfpv3.
363       .Case("neon-vfpv3", "neon")
364       .Default(FPU);
365 }
366 
367 StringRef ARM::getFPUName(unsigned FPUKind) {
368   if (FPUKind >= FK_LAST)
369     return StringRef();
370   return FPUNames[FPUKind].getName();
371 }
372 
373 ARM::FPUVersion ARM::getFPUVersion(unsigned FPUKind) {
374   if (FPUKind >= FK_LAST)
375     return FPUVersion::NONE;
376   return FPUNames[FPUKind].FPUVer;
377 }
378 
379 ARM::FPURestriction ARM::getFPURestriction(unsigned FPUKind) {
380   if (FPUKind >= FK_LAST)
381     return FPURestriction::None;
382   return FPUNames[FPUKind].Restriction;
383 }
384 
385 unsigned ARM::getDefaultFPU(StringRef CPU, ARM::ArchKind AK) {
386   if (CPU == "generic")
387     return ARM::ARCHNames[static_cast<unsigned>(AK)].DefaultFPU;
388 
389   return StringSwitch<unsigned>(CPU)
390 #define ARM_CPU_NAME(NAME, ID, DEFAULT_FPU, IS_DEFAULT, DEFAULT_EXT)           \
391   .Case(NAME, DEFAULT_FPU)
392 #include "llvm/Support/ARMTargetParser.def"
393    .Default(ARM::FK_INVALID);
394 }
395 
396 uint64_t ARM::getDefaultExtensions(StringRef CPU, ARM::ArchKind AK) {
397   if (CPU == "generic")
398     return ARM::ARCHNames[static_cast<unsigned>(AK)].ArchBaseExtensions;
399 
400   return StringSwitch<uint64_t>(CPU)
401 #define ARM_CPU_NAME(NAME, ID, DEFAULT_FPU, IS_DEFAULT, DEFAULT_EXT)           \
402   .Case(NAME,                                                                  \
403         ARCHNames[static_cast<unsigned>(ArchKind::ID)].ArchBaseExtensions |    \
404             DEFAULT_EXT)
405 #include "llvm/Support/ARMTargetParser.def"
406   .Default(ARM::AEK_INVALID);
407 }
408 
409 bool ARM::getHWDivFeatures(uint64_t HWDivKind,
410                            std::vector<StringRef> &Features) {
411 
412   if (HWDivKind == AEK_INVALID)
413     return false;
414 
415   if (HWDivKind & AEK_HWDIVARM)
416     Features.push_back("+hwdiv-arm");
417   else
418     Features.push_back("-hwdiv-arm");
419 
420   if (HWDivKind & AEK_HWDIVTHUMB)
421     Features.push_back("+hwdiv");
422   else
423     Features.push_back("-hwdiv");
424 
425   return true;
426 }
427 
428 bool ARM::getExtensionFeatures(uint64_t Extensions,
429                                std::vector<StringRef> &Features) {
430 
431   if (Extensions == AEK_INVALID)
432     return false;
433 
434   for (const auto &AE : ARCHExtNames) {
435     if ((Extensions & AE.ID) == AE.ID && AE.Feature)
436       Features.push_back(AE.Feature);
437     else if (AE.NegFeature)
438       Features.push_back(AE.NegFeature);
439   }
440 
441   return getHWDivFeatures(Extensions, Features);
442 }
443 
444 StringRef ARM::getArchName(ARM::ArchKind AK) {
445   return ARCHNames[static_cast<unsigned>(AK)].getName();
446 }
447 
448 StringRef ARM::getCPUAttr(ARM::ArchKind AK) {
449   return ARCHNames[static_cast<unsigned>(AK)].getCPUAttr();
450 }
451 
452 StringRef ARM::getSubArch(ARM::ArchKind AK) {
453   return ARCHNames[static_cast<unsigned>(AK)].getSubArch();
454 }
455 
456 unsigned ARM::getArchAttr(ARM::ArchKind AK) {
457   return ARCHNames[static_cast<unsigned>(AK)].ArchAttr;
458 }
459 
460 StringRef ARM::getArchExtName(uint64_t ArchExtKind) {
461   for (const auto &AE : ARCHExtNames) {
462     if (ArchExtKind == AE.ID)
463       return AE.getName();
464   }
465   return StringRef();
466 }
467 
468 static bool stripNegationPrefix(StringRef &Name) {
469   if (Name.startswith("no")) {
470     Name = Name.substr(2);
471     return true;
472   }
473   return false;
474 }
475 
476 StringRef ARM::getArchExtFeature(StringRef ArchExt) {
477   bool Negated = stripNegationPrefix(ArchExt);
478   for (const auto &AE : ARCHExtNames) {
479     if (AE.Feature && ArchExt == AE.getName())
480       return StringRef(Negated ? AE.NegFeature : AE.Feature);
481   }
482 
483   return StringRef();
484 }
485 
486 static unsigned findDoublePrecisionFPU(unsigned InputFPUKind) {
487   const ARM::FPUName &InputFPU = ARM::FPUNames[InputFPUKind];
488 
489   // If the input FPU already supports double-precision, then there
490   // isn't any different FPU we can return here.
491   //
492   // The current available FPURestriction values are None (no
493   // restriction), D16 (only 16 d-regs) and SP_D16 (16 d-regs
494   // and single precision only); there's no value representing
495   // SP restriction without D16. So this test just means 'is it
496   // SP only?'.
497   if (InputFPU.Restriction != ARM::FPURestriction::SP_D16)
498     return ARM::FK_INVALID;
499 
500   // Otherwise, look for an FPU entry with all the same fields, except
501   // that SP_D16 has been replaced with just D16, representing adding
502   // double precision and not changing anything else.
503   for (const ARM::FPUName &CandidateFPU : ARM::FPUNames) {
504     if (CandidateFPU.FPUVer == InputFPU.FPUVer &&
505         CandidateFPU.NeonSupport == InputFPU.NeonSupport &&
506         CandidateFPU.Restriction == ARM::FPURestriction::D16) {
507       return CandidateFPU.ID;
508     }
509   }
510 
511   // nothing found
512   return ARM::FK_INVALID;
513 }
514 
515 bool ARM::appendArchExtFeatures(StringRef CPU, ARM::ArchKind AK,
516                                 StringRef ArchExt,
517                                 std::vector<StringRef> &Features,
518                                 unsigned &ArgFPUID) {
519 
520   size_t StartingNumFeatures = Features.size();
521   const bool Negated = stripNegationPrefix(ArchExt);
522   uint64_t ID = parseArchExt(ArchExt);
523 
524   if (ID == AEK_INVALID)
525     return false;
526 
527   for (const auto &AE : ARCHExtNames) {
528     if (Negated) {
529       if ((AE.ID & ID) == ID && AE.NegFeature)
530         Features.push_back(AE.NegFeature);
531     } else {
532       if ((AE.ID & ID) == AE.ID && AE.Feature)
533         Features.push_back(AE.Feature);
534     }
535   }
536 
537   if (CPU == "")
538     CPU = "generic";
539 
540   if (ArchExt == "fp" || ArchExt == "fp.dp") {
541     unsigned FPUKind;
542     if (ArchExt == "fp.dp") {
543       if (Negated) {
544         Features.push_back("-fp64");
545         return true;
546       }
547       FPUKind = findDoublePrecisionFPU(getDefaultFPU(CPU, AK));
548     } else if (Negated) {
549       FPUKind = ARM::FK_NONE;
550     } else {
551       FPUKind = getDefaultFPU(CPU, AK);
552     }
553     ArgFPUID = FPUKind;
554     return ARM::getFPUFeatures(FPUKind, Features);
555   }
556   return StartingNumFeatures != Features.size();
557 }
558 
559 StringRef ARM::getDefaultCPU(StringRef Arch) {
560   ArchKind AK = parseArch(Arch);
561   if (AK == ArchKind::INVALID)
562     return StringRef();
563 
564   // Look for multiple AKs to find the default for pair AK+Name.
565   for (const auto &CPU : CPUNames) {
566     if (CPU.ArchID == AK && CPU.Default)
567       return CPU.getName();
568   }
569 
570   // If we can't find a default then target the architecture instead
571   return "generic";
572 }
573 
574 uint64_t ARM::parseHWDiv(StringRef HWDiv) {
575   StringRef Syn = getHWDivSynonym(HWDiv);
576   for (const auto &D : HWDivNames) {
577     if (Syn == D.getName())
578       return D.ID;
579   }
580   return AEK_INVALID;
581 }
582 
583 uint64_t ARM::parseArchExt(StringRef ArchExt) {
584   for (const auto &A : ARCHExtNames) {
585     if (ArchExt == A.getName())
586       return A.ID;
587   }
588   return AEK_INVALID;
589 }
590 
591 ARM::ArchKind ARM::parseCPUArch(StringRef CPU) {
592   for (const auto &C : CPUNames) {
593     if (CPU == C.getName())
594       return C.ArchID;
595   }
596   return ArchKind::INVALID;
597 }
598 
599 void ARM::fillValidCPUArchList(SmallVectorImpl<StringRef> &Values) {
600   for (const CpuNames<ArchKind> &Arch : CPUNames) {
601     if (Arch.ArchID != ArchKind::INVALID)
602       Values.push_back(Arch.getName());
603   }
604 }
605 
606 StringRef ARM::computeDefaultTargetABI(const Triple &TT, StringRef CPU) {
607   StringRef ArchName =
608       CPU.empty() ? TT.getArchName() : getArchName(parseCPUArch(CPU));
609 
610   if (TT.isOSBinFormatMachO()) {
611     if (TT.getEnvironment() == Triple::EABI ||
612         TT.getOS() == Triple::UnknownOS ||
613         parseArchProfile(ArchName) == ProfileKind::M)
614       return "aapcs";
615     if (TT.isWatchABI())
616       return "aapcs16";
617     return "apcs-gnu";
618   } else if (TT.isOSWindows())
619     // FIXME: this is invalid for WindowsCE.
620     return "aapcs";
621 
622   // Select the default based on the platform.
623   switch (TT.getEnvironment()) {
624   case Triple::Android:
625   case Triple::GNUEABI:
626   case Triple::GNUEABIHF:
627   case Triple::MuslEABI:
628   case Triple::MuslEABIHF:
629     return "aapcs-linux";
630   case Triple::EABIHF:
631   case Triple::EABI:
632     return "aapcs";
633   default:
634     if (TT.isOSNetBSD())
635       return "apcs-gnu";
636     if (TT.isOSOpenBSD())
637       return "aapcs-linux";
638     return "aapcs";
639   }
640 }
641