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