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