xref: /llvm-project/llvm/lib/Target/SPIRV/SPIRVModuleAnalysis.cpp (revision f352ce368af39e57d337495d7ca3a21975ede8e6) 
1 //===- SPIRVModuleAnalysis.cpp - analysis of global instrs & regs - 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 // The analysis collects instructions that should be output at the module level
10 // and performs the global register numbering.
11 //
12 // The results of this analysis are used in AsmPrinter to rename registers
13 // globally and to output required instructions at the module level.
14 //
15 //===----------------------------------------------------------------------===//
16 
17 #include "SPIRVModuleAnalysis.h"
18 #include "MCTargetDesc/SPIRVBaseInfo.h"
19 #include "MCTargetDesc/SPIRVMCTargetDesc.h"
20 #include "SPIRV.h"
21 #include "SPIRVSubtarget.h"
22 #include "SPIRVTargetMachine.h"
23 #include "SPIRVUtils.h"
24 #include "TargetInfo/SPIRVTargetInfo.h"
25 #include "llvm/ADT/STLExtras.h"
26 #include "llvm/CodeGen/MachineModuleInfo.h"
27 #include "llvm/CodeGen/TargetPassConfig.h"
28 
29 using namespace llvm;
30 
31 #define DEBUG_TYPE "spirv-module-analysis"
32 
33 static cl::opt<bool>
34     SPVDumpDeps("spv-dump-deps",
35                 cl::desc("Dump MIR with SPIR-V dependencies info"),
36                 cl::Optional, cl::init(false));
37 
38 static cl::list<SPIRV::Capability::Capability>
39     AvoidCapabilities("avoid-spirv-capabilities",
40                       cl::desc("SPIR-V capabilities to avoid if there are "
41                                "other options enabling a feature"),
42                       cl::ZeroOrMore, cl::Hidden,
43                       cl::values(clEnumValN(SPIRV::Capability::Shader, "Shader",
44                                             "SPIR-V Shader capability")));
45 // Use sets instead of cl::list to check "if contains" condition
46 struct AvoidCapabilitiesSet {
47   SmallSet<SPIRV::Capability::Capability, 4> S;
48   AvoidCapabilitiesSet() {
49     for (auto Cap : AvoidCapabilities)
50       S.insert(Cap);
51   }
52 };
53 
54 char llvm::SPIRVModuleAnalysis::ID = 0;
55 
56 namespace llvm {
57 void initializeSPIRVModuleAnalysisPass(PassRegistry &);
58 } // namespace llvm
59 
60 INITIALIZE_PASS(SPIRVModuleAnalysis, DEBUG_TYPE, "SPIRV module analysis", true,
61                 true)
62 
63 // Retrieve an unsigned from an MDNode with a list of them as operands.
64 static unsigned getMetadataUInt(MDNode *MdNode, unsigned OpIndex,
65                                 unsigned DefaultVal = 0) {
66   if (MdNode && OpIndex < MdNode->getNumOperands()) {
67     const auto &Op = MdNode->getOperand(OpIndex);
68     return mdconst::extract<ConstantInt>(Op)->getZExtValue();
69   }
70   return DefaultVal;
71 }
72 
73 static SPIRV::Requirements
74 getSymbolicOperandRequirements(SPIRV::OperandCategory::OperandCategory Category,
75                                unsigned i, const SPIRVSubtarget &ST,
76                                SPIRV::RequirementHandler &Reqs) {
77   static AvoidCapabilitiesSet
78       AvoidCaps; // contains capabilities to avoid if there is another option
79 
80   VersionTuple ReqMinVer = getSymbolicOperandMinVersion(Category, i);
81   VersionTuple ReqMaxVer = getSymbolicOperandMaxVersion(Category, i);
82   VersionTuple SPIRVVersion = ST.getSPIRVVersion();
83   bool MinVerOK = SPIRVVersion.empty() || SPIRVVersion >= ReqMinVer;
84   bool MaxVerOK =
85       ReqMaxVer.empty() || SPIRVVersion.empty() || SPIRVVersion <= ReqMaxVer;
86   CapabilityList ReqCaps = getSymbolicOperandCapabilities(Category, i);
87   ExtensionList ReqExts = getSymbolicOperandExtensions(Category, i);
88   if (ReqCaps.empty()) {
89     if (ReqExts.empty()) {
90       if (MinVerOK && MaxVerOK)
91         return {true, {}, {}, ReqMinVer, ReqMaxVer};
92       return {false, {}, {}, VersionTuple(), VersionTuple()};
93     }
94   } else if (MinVerOK && MaxVerOK) {
95     if (ReqCaps.size() == 1) {
96       auto Cap = ReqCaps[0];
97       if (Reqs.isCapabilityAvailable(Cap))
98         return {true, {Cap}, {}, ReqMinVer, ReqMaxVer};
99     } else {
100       // By SPIR-V specification: "If an instruction, enumerant, or other
101       // feature specifies multiple enabling capabilities, only one such
102       // capability needs to be declared to use the feature." However, one
103       // capability may be preferred over another. We use command line
104       // argument(s) and AvoidCapabilities to avoid selection of certain
105       // capabilities if there are other options.
106       CapabilityList UseCaps;
107       for (auto Cap : ReqCaps)
108         if (Reqs.isCapabilityAvailable(Cap))
109           UseCaps.push_back(Cap);
110       for (size_t i = 0, Sz = UseCaps.size(); i < Sz; ++i) {
111         auto Cap = UseCaps[i];
112         if (i == Sz - 1 || !AvoidCaps.S.contains(Cap))
113           return {true, {Cap}, {}, ReqMinVer, ReqMaxVer};
114       }
115     }
116   }
117   // If there are no capabilities, or we can't satisfy the version or
118   // capability requirements, use the list of extensions (if the subtarget
119   // can handle them all).
120   if (llvm::all_of(ReqExts, [&ST](const SPIRV::Extension::Extension &Ext) {
121         return ST.canUseExtension(Ext);
122       })) {
123     return {true,
124             {},
125             ReqExts,
126             VersionTuple(),
127             VersionTuple()}; // TODO: add versions to extensions.
128   }
129   return {false, {}, {}, VersionTuple(), VersionTuple()};
130 }
131 
132 void SPIRVModuleAnalysis::setBaseInfo(const Module &M) {
133   MAI.MaxID = 0;
134   for (int i = 0; i < SPIRV::NUM_MODULE_SECTIONS; i++)
135     MAI.MS[i].clear();
136   MAI.RegisterAliasTable.clear();
137   MAI.InstrsToDelete.clear();
138   MAI.FuncMap.clear();
139   MAI.GlobalVarList.clear();
140   MAI.ExtInstSetMap.clear();
141   MAI.Reqs.clear();
142   MAI.Reqs.initAvailableCapabilities(*ST);
143 
144   // TODO: determine memory model and source language from the configuratoin.
145   if (auto MemModel = M.getNamedMetadata("spirv.MemoryModel")) {
146     auto MemMD = MemModel->getOperand(0);
147     MAI.Addr = static_cast<SPIRV::AddressingModel::AddressingModel>(
148         getMetadataUInt(MemMD, 0));
149     MAI.Mem =
150         static_cast<SPIRV::MemoryModel::MemoryModel>(getMetadataUInt(MemMD, 1));
151   } else {
152     // TODO: Add support for VulkanMemoryModel.
153     MAI.Mem = ST->isOpenCLEnv() ? SPIRV::MemoryModel::OpenCL
154                                 : SPIRV::MemoryModel::GLSL450;
155     if (MAI.Mem == SPIRV::MemoryModel::OpenCL) {
156       unsigned PtrSize = ST->getPointerSize();
157       MAI.Addr = PtrSize == 32   ? SPIRV::AddressingModel::Physical32
158                  : PtrSize == 64 ? SPIRV::AddressingModel::Physical64
159                                  : SPIRV::AddressingModel::Logical;
160     } else {
161       // TODO: Add support for PhysicalStorageBufferAddress.
162       MAI.Addr = SPIRV::AddressingModel::Logical;
163     }
164   }
165   // Get the OpenCL version number from metadata.
166   // TODO: support other source languages.
167   if (auto VerNode = M.getNamedMetadata("opencl.ocl.version")) {
168     MAI.SrcLang = SPIRV::SourceLanguage::OpenCL_C;
169     // Construct version literal in accordance with SPIRV-LLVM-Translator.
170     // TODO: support multiple OCL version metadata.
171     assert(VerNode->getNumOperands() > 0 && "Invalid SPIR");
172     auto VersionMD = VerNode->getOperand(0);
173     unsigned MajorNum = getMetadataUInt(VersionMD, 0, 2);
174     unsigned MinorNum = getMetadataUInt(VersionMD, 1);
175     unsigned RevNum = getMetadataUInt(VersionMD, 2);
176     // Prevent Major part of OpenCL version to be 0
177     MAI.SrcLangVersion =
178         (std::max(1U, MajorNum) * 100 + MinorNum) * 1000 + RevNum;
179   } else {
180     // If there is no information about OpenCL version we are forced to generate
181     // OpenCL 1.0 by default for the OpenCL environment to avoid puzzling
182     // run-times with Unknown/0.0 version output. For a reference, LLVM-SPIRV
183     // Translator avoids potential issues with run-times in a similar manner.
184     if (ST->isOpenCLEnv()) {
185       MAI.SrcLang = SPIRV::SourceLanguage::OpenCL_CPP;
186       MAI.SrcLangVersion = 100000;
187     } else {
188       MAI.SrcLang = SPIRV::SourceLanguage::Unknown;
189       MAI.SrcLangVersion = 0;
190     }
191   }
192 
193   if (auto ExtNode = M.getNamedMetadata("opencl.used.extensions")) {
194     for (unsigned I = 0, E = ExtNode->getNumOperands(); I != E; ++I) {
195       MDNode *MD = ExtNode->getOperand(I);
196       if (!MD || MD->getNumOperands() == 0)
197         continue;
198       for (unsigned J = 0, N = MD->getNumOperands(); J != N; ++J)
199         MAI.SrcExt.insert(cast<MDString>(MD->getOperand(J))->getString());
200     }
201   }
202 
203   // Update required capabilities for this memory model, addressing model and
204   // source language.
205   MAI.Reqs.getAndAddRequirements(SPIRV::OperandCategory::MemoryModelOperand,
206                                  MAI.Mem, *ST);
207   MAI.Reqs.getAndAddRequirements(SPIRV::OperandCategory::SourceLanguageOperand,
208                                  MAI.SrcLang, *ST);
209   MAI.Reqs.getAndAddRequirements(SPIRV::OperandCategory::AddressingModelOperand,
210                                  MAI.Addr, *ST);
211 
212   if (ST->isOpenCLEnv()) {
213     // TODO: check if it's required by default.
214     MAI.ExtInstSetMap[static_cast<unsigned>(
215         SPIRV::InstructionSet::OpenCL_std)] =
216         Register::index2VirtReg(MAI.getNextID());
217   }
218 }
219 
220 // Collect MI which defines the register in the given machine function.
221 static void collectDefInstr(Register Reg, const MachineFunction *MF,
222                             SPIRV::ModuleAnalysisInfo *MAI,
223                             SPIRV::ModuleSectionType MSType,
224                             bool DoInsert = true) {
225   assert(MAI->hasRegisterAlias(MF, Reg) && "Cannot find register alias");
226   MachineInstr *MI = MF->getRegInfo().getUniqueVRegDef(Reg);
227   assert(MI && "There should be an instruction that defines the register");
228   MAI->setSkipEmission(MI);
229   if (DoInsert)
230     MAI->MS[MSType].push_back(MI);
231 }
232 
233 void SPIRVModuleAnalysis::collectGlobalEntities(
234     const std::vector<SPIRV::DTSortableEntry *> &DepsGraph,
235     SPIRV::ModuleSectionType MSType,
236     std::function<bool(const SPIRV::DTSortableEntry *)> Pred,
237     bool UsePreOrder = false) {
238   DenseSet<const SPIRV::DTSortableEntry *> Visited;
239   for (const auto *E : DepsGraph) {
240     std::function<void(const SPIRV::DTSortableEntry *)> RecHoistUtil;
241     // NOTE: here we prefer recursive approach over iterative because
242     // we don't expect depchains long enough to cause SO.
243     RecHoistUtil = [MSType, UsePreOrder, &Visited, &Pred,
244                     &RecHoistUtil](const SPIRV::DTSortableEntry *E) {
245       if (Visited.count(E) || !Pred(E))
246         return;
247       Visited.insert(E);
248 
249       // Traversing deps graph in post-order allows us to get rid of
250       // register aliases preprocessing.
251       // But pre-order is required for correct processing of function
252       // declaration and arguments processing.
253       if (!UsePreOrder)
254         for (auto *S : E->getDeps())
255           RecHoistUtil(S);
256 
257       Register GlobalReg = Register::index2VirtReg(MAI.getNextID());
258       bool IsFirst = true;
259       for (auto &U : *E) {
260         const MachineFunction *MF = U.first;
261         Register Reg = U.second;
262         MAI.setRegisterAlias(MF, Reg, GlobalReg);
263         if (!MF->getRegInfo().getUniqueVRegDef(Reg))
264           continue;
265         collectDefInstr(Reg, MF, &MAI, MSType, IsFirst);
266         IsFirst = false;
267         if (E->getIsGV())
268           MAI.GlobalVarList.push_back(MF->getRegInfo().getUniqueVRegDef(Reg));
269       }
270 
271       if (UsePreOrder)
272         for (auto *S : E->getDeps())
273           RecHoistUtil(S);
274     };
275     RecHoistUtil(E);
276   }
277 }
278 
279 // The function initializes global register alias table for types, consts,
280 // global vars and func decls and collects these instruction for output
281 // at module level. Also it collects explicit OpExtension/OpCapability
282 // instructions.
283 void SPIRVModuleAnalysis::processDefInstrs(const Module &M) {
284   std::vector<SPIRV::DTSortableEntry *> DepsGraph;
285 
286   GR->buildDepsGraph(DepsGraph, SPVDumpDeps ? MMI : nullptr);
287 
288   collectGlobalEntities(
289       DepsGraph, SPIRV::MB_TypeConstVars,
290       [](const SPIRV::DTSortableEntry *E) { return !E->getIsFunc(); });
291 
292   for (auto F = M.begin(), E = M.end(); F != E; ++F) {
293     MachineFunction *MF = MMI->getMachineFunction(*F);
294     if (!MF)
295       continue;
296     // Iterate through and collect OpExtension/OpCapability instructions.
297     for (MachineBasicBlock &MBB : *MF) {
298       for (MachineInstr &MI : MBB) {
299         if (MI.getOpcode() == SPIRV::OpExtension) {
300           // Here, OpExtension just has a single enum operand, not a string.
301           auto Ext = SPIRV::Extension::Extension(MI.getOperand(0).getImm());
302           MAI.Reqs.addExtension(Ext);
303           MAI.setSkipEmission(&MI);
304         } else if (MI.getOpcode() == SPIRV::OpCapability) {
305           auto Cap = SPIRV::Capability::Capability(MI.getOperand(0).getImm());
306           MAI.Reqs.addCapability(Cap);
307           MAI.setSkipEmission(&MI);
308         }
309       }
310     }
311   }
312 
313   collectGlobalEntities(
314       DepsGraph, SPIRV::MB_ExtFuncDecls,
315       [](const SPIRV::DTSortableEntry *E) { return E->getIsFunc(); }, true);
316 }
317 
318 // Look for IDs declared with Import linkage, and map the corresponding function
319 // to the register defining that variable (which will usually be the result of
320 // an OpFunction). This lets us call externally imported functions using
321 // the correct ID registers.
322 void SPIRVModuleAnalysis::collectFuncNames(MachineInstr &MI,
323                                            const Function *F) {
324   if (MI.getOpcode() == SPIRV::OpDecorate) {
325     // If it's got Import linkage.
326     auto Dec = MI.getOperand(1).getImm();
327     if (Dec == static_cast<unsigned>(SPIRV::Decoration::LinkageAttributes)) {
328       auto Lnk = MI.getOperand(MI.getNumOperands() - 1).getImm();
329       if (Lnk == static_cast<unsigned>(SPIRV::LinkageType::Import)) {
330         // Map imported function name to function ID register.
331         const Function *ImportedFunc =
332             F->getParent()->getFunction(getStringImm(MI, 2));
333         Register Target = MI.getOperand(0).getReg();
334         MAI.FuncMap[ImportedFunc] = MAI.getRegisterAlias(MI.getMF(), Target);
335       }
336     }
337   } else if (MI.getOpcode() == SPIRV::OpFunction) {
338     // Record all internal OpFunction declarations.
339     Register Reg = MI.defs().begin()->getReg();
340     Register GlobalReg = MAI.getRegisterAlias(MI.getMF(), Reg);
341     assert(GlobalReg.isValid());
342     MAI.FuncMap[F] = GlobalReg;
343   }
344 }
345 
346 // References to a function via function pointers generate virtual
347 // registers without a definition. We are able to resolve this
348 // reference using Globar Register info into an OpFunction instruction
349 // and replace dummy operands by the corresponding global register references.
350 void SPIRVModuleAnalysis::collectFuncPtrs() {
351   for (auto &MI : MAI.MS[SPIRV::MB_TypeConstVars])
352     if (MI->getOpcode() == SPIRV::OpConstantFunctionPointerINTEL)
353       collectFuncPtrs(MI);
354 }
355 
356 void SPIRVModuleAnalysis::collectFuncPtrs(MachineInstr *MI) {
357   const MachineOperand *FunUse = &MI->getOperand(2);
358   if (const MachineOperand *FunDef = GR->getFunctionDefinitionByUse(FunUse)) {
359     const MachineInstr *FunDefMI = FunDef->getParent();
360     assert(FunDefMI->getOpcode() == SPIRV::OpFunction &&
361            "Constant function pointer must refer to function definition");
362     Register FunDefReg = FunDef->getReg();
363     Register GlobalFunDefReg =
364         MAI.getRegisterAlias(FunDefMI->getMF(), FunDefReg);
365     assert(GlobalFunDefReg.isValid() &&
366            "Function definition must refer to a global register");
367     Register FunPtrReg = FunUse->getReg();
368     MAI.setRegisterAlias(MI->getMF(), FunPtrReg, GlobalFunDefReg);
369   }
370 }
371 
372 using InstrSignature = SmallVector<size_t>;
373 using InstrTraces = std::set<InstrSignature>;
374 
375 // Returns a representation of an instruction as a vector of MachineOperand
376 // hash values, see llvm::hash_value(const MachineOperand &MO) for details.
377 // This creates a signature of the instruction with the same content
378 // that MachineOperand::isIdenticalTo uses for comparison.
379 static InstrSignature instrToSignature(MachineInstr &MI,
380                                        SPIRV::ModuleAnalysisInfo &MAI) {
381   InstrSignature Signature;
382   for (unsigned i = 0; i < MI.getNumOperands(); ++i) {
383     const MachineOperand &MO = MI.getOperand(i);
384     size_t h;
385     if (MO.isReg()) {
386       Register RegAlias = MAI.getRegisterAlias(MI.getMF(), MO.getReg());
387       // mimic llvm::hash_value(const MachineOperand &MO)
388       h = hash_combine(MO.getType(), (unsigned)RegAlias, MO.getSubReg(),
389                        MO.isDef());
390     } else {
391       h = hash_value(MO);
392     }
393     Signature.push_back(h);
394   }
395   return Signature;
396 }
397 
398 // Collect the given instruction in the specified MS. We assume global register
399 // numbering has already occurred by this point. We can directly compare reg
400 // arguments when detecting duplicates.
401 static void collectOtherInstr(MachineInstr &MI, SPIRV::ModuleAnalysisInfo &MAI,
402                               SPIRV::ModuleSectionType MSType, InstrTraces &IS,
403                               bool Append = true) {
404   MAI.setSkipEmission(&MI);
405   InstrSignature MISign = instrToSignature(MI, MAI);
406   auto FoundMI = IS.insert(MISign);
407   if (!FoundMI.second)
408     return; // insert failed, so we found a duplicate; don't add it to MAI.MS
409   // No duplicates, so add it.
410   if (Append)
411     MAI.MS[MSType].push_back(&MI);
412   else
413     MAI.MS[MSType].insert(MAI.MS[MSType].begin(), &MI);
414 }
415 
416 // Some global instructions make reference to function-local ID regs, so cannot
417 // be correctly collected until these registers are globally numbered.
418 void SPIRVModuleAnalysis::processOtherInstrs(const Module &M) {
419   InstrTraces IS;
420   for (auto F = M.begin(), E = M.end(); F != E; ++F) {
421     if ((*F).isDeclaration())
422       continue;
423     MachineFunction *MF = MMI->getMachineFunction(*F);
424     assert(MF);
425     for (MachineBasicBlock &MBB : *MF)
426       for (MachineInstr &MI : MBB) {
427         if (MAI.getSkipEmission(&MI))
428           continue;
429         const unsigned OpCode = MI.getOpcode();
430         if (OpCode == SPIRV::OpName || OpCode == SPIRV::OpMemberName) {
431           collectOtherInstr(MI, MAI, SPIRV::MB_DebugNames, IS);
432         } else if (OpCode == SPIRV::OpEntryPoint) {
433           collectOtherInstr(MI, MAI, SPIRV::MB_EntryPoints, IS);
434         } else if (TII->isDecorationInstr(MI)) {
435           collectOtherInstr(MI, MAI, SPIRV::MB_Annotations, IS);
436           collectFuncNames(MI, &*F);
437         } else if (TII->isConstantInstr(MI)) {
438           // Now OpSpecConstant*s are not in DT,
439           // but they need to be collected anyway.
440           collectOtherInstr(MI, MAI, SPIRV::MB_TypeConstVars, IS);
441         } else if (OpCode == SPIRV::OpFunction) {
442           collectFuncNames(MI, &*F);
443         } else if (OpCode == SPIRV::OpTypeForwardPointer) {
444           collectOtherInstr(MI, MAI, SPIRV::MB_TypeConstVars, IS, false);
445         }
446       }
447   }
448 }
449 
450 // Number registers in all functions globally from 0 onwards and store
451 // the result in global register alias table. Some registers are already
452 // numbered in collectGlobalEntities.
453 void SPIRVModuleAnalysis::numberRegistersGlobally(const Module &M) {
454   for (auto F = M.begin(), E = M.end(); F != E; ++F) {
455     if ((*F).isDeclaration())
456       continue;
457     MachineFunction *MF = MMI->getMachineFunction(*F);
458     assert(MF);
459     for (MachineBasicBlock &MBB : *MF) {
460       for (MachineInstr &MI : MBB) {
461         for (MachineOperand &Op : MI.operands()) {
462           if (!Op.isReg())
463             continue;
464           Register Reg = Op.getReg();
465           if (MAI.hasRegisterAlias(MF, Reg))
466             continue;
467           Register NewReg = Register::index2VirtReg(MAI.getNextID());
468           MAI.setRegisterAlias(MF, Reg, NewReg);
469         }
470         if (MI.getOpcode() != SPIRV::OpExtInst)
471           continue;
472         auto Set = MI.getOperand(2).getImm();
473         if (!MAI.ExtInstSetMap.contains(Set))
474           MAI.ExtInstSetMap[Set] = Register::index2VirtReg(MAI.getNextID());
475       }
476     }
477   }
478 }
479 
480 // RequirementHandler implementations.
481 void SPIRV::RequirementHandler::getAndAddRequirements(
482     SPIRV::OperandCategory::OperandCategory Category, uint32_t i,
483     const SPIRVSubtarget &ST) {
484   addRequirements(getSymbolicOperandRequirements(Category, i, ST, *this));
485 }
486 
487 void SPIRV::RequirementHandler::recursiveAddCapabilities(
488     const CapabilityList &ToPrune) {
489   for (const auto &Cap : ToPrune) {
490     AllCaps.insert(Cap);
491     CapabilityList ImplicitDecls =
492         getSymbolicOperandCapabilities(OperandCategory::CapabilityOperand, Cap);
493     recursiveAddCapabilities(ImplicitDecls);
494   }
495 }
496 
497 void SPIRV::RequirementHandler::addCapabilities(const CapabilityList &ToAdd) {
498   for (const auto &Cap : ToAdd) {
499     bool IsNewlyInserted = AllCaps.insert(Cap).second;
500     if (!IsNewlyInserted) // Don't re-add if it's already been declared.
501       continue;
502     CapabilityList ImplicitDecls =
503         getSymbolicOperandCapabilities(OperandCategory::CapabilityOperand, Cap);
504     recursiveAddCapabilities(ImplicitDecls);
505     MinimalCaps.push_back(Cap);
506   }
507 }
508 
509 void SPIRV::RequirementHandler::addRequirements(
510     const SPIRV::Requirements &Req) {
511   if (!Req.IsSatisfiable)
512     report_fatal_error("Adding SPIR-V requirements this target can't satisfy.");
513 
514   if (Req.Cap.has_value())
515     addCapabilities({Req.Cap.value()});
516 
517   addExtensions(Req.Exts);
518 
519   if (!Req.MinVer.empty()) {
520     if (!MaxVersion.empty() && Req.MinVer > MaxVersion) {
521       LLVM_DEBUG(dbgs() << "Conflicting version requirements: >= " << Req.MinVer
522                         << " and <= " << MaxVersion << "\n");
523       report_fatal_error("Adding SPIR-V requirements that can't be satisfied.");
524     }
525 
526     if (MinVersion.empty() || Req.MinVer > MinVersion)
527       MinVersion = Req.MinVer;
528   }
529 
530   if (!Req.MaxVer.empty()) {
531     if (!MinVersion.empty() && Req.MaxVer < MinVersion) {
532       LLVM_DEBUG(dbgs() << "Conflicting version requirements: <= " << Req.MaxVer
533                         << " and >= " << MinVersion << "\n");
534       report_fatal_error("Adding SPIR-V requirements that can't be satisfied.");
535     }
536 
537     if (MaxVersion.empty() || Req.MaxVer < MaxVersion)
538       MaxVersion = Req.MaxVer;
539   }
540 }
541 
542 void SPIRV::RequirementHandler::checkSatisfiable(
543     const SPIRVSubtarget &ST) const {
544   // Report as many errors as possible before aborting the compilation.
545   bool IsSatisfiable = true;
546   auto TargetVer = ST.getSPIRVVersion();
547 
548   if (!MaxVersion.empty() && !TargetVer.empty() && MaxVersion < TargetVer) {
549     LLVM_DEBUG(
550         dbgs() << "Target SPIR-V version too high for required features\n"
551                << "Required max version: " << MaxVersion << " target version "
552                << TargetVer << "\n");
553     IsSatisfiable = false;
554   }
555 
556   if (!MinVersion.empty() && !TargetVer.empty() && MinVersion > TargetVer) {
557     LLVM_DEBUG(dbgs() << "Target SPIR-V version too low for required features\n"
558                       << "Required min version: " << MinVersion
559                       << " target version " << TargetVer << "\n");
560     IsSatisfiable = false;
561   }
562 
563   if (!MinVersion.empty() && !MaxVersion.empty() && MinVersion > MaxVersion) {
564     LLVM_DEBUG(
565         dbgs()
566         << "Version is too low for some features and too high for others.\n"
567         << "Required SPIR-V min version: " << MinVersion
568         << " required SPIR-V max version " << MaxVersion << "\n");
569     IsSatisfiable = false;
570   }
571 
572   for (auto Cap : MinimalCaps) {
573     if (AvailableCaps.contains(Cap))
574       continue;
575     LLVM_DEBUG(dbgs() << "Capability not supported: "
576                       << getSymbolicOperandMnemonic(
577                              OperandCategory::CapabilityOperand, Cap)
578                       << "\n");
579     IsSatisfiable = false;
580   }
581 
582   for (auto Ext : AllExtensions) {
583     if (ST.canUseExtension(Ext))
584       continue;
585     LLVM_DEBUG(dbgs() << "Extension not supported: "
586                       << getSymbolicOperandMnemonic(
587                              OperandCategory::ExtensionOperand, Ext)
588                       << "\n");
589     IsSatisfiable = false;
590   }
591 
592   if (!IsSatisfiable)
593     report_fatal_error("Unable to meet SPIR-V requirements for this target.");
594 }
595 
596 // Add the given capabilities and all their implicitly defined capabilities too.
597 void SPIRV::RequirementHandler::addAvailableCaps(const CapabilityList &ToAdd) {
598   for (const auto Cap : ToAdd)
599     if (AvailableCaps.insert(Cap).second)
600       addAvailableCaps(getSymbolicOperandCapabilities(
601           SPIRV::OperandCategory::CapabilityOperand, Cap));
602 }
603 
604 void SPIRV::RequirementHandler::removeCapabilityIf(
605     const Capability::Capability ToRemove,
606     const Capability::Capability IfPresent) {
607   if (AllCaps.contains(IfPresent))
608     AllCaps.erase(ToRemove);
609 }
610 
611 namespace llvm {
612 namespace SPIRV {
613 void RequirementHandler::initAvailableCapabilities(const SPIRVSubtarget &ST) {
614   if (ST.isOpenCLEnv()) {
615     initAvailableCapabilitiesForOpenCL(ST);
616     return;
617   }
618 
619   if (ST.isVulkanEnv()) {
620     initAvailableCapabilitiesForVulkan(ST);
621     return;
622   }
623 
624   report_fatal_error("Unimplemented environment for SPIR-V generation.");
625 }
626 
627 void RequirementHandler::initAvailableCapabilitiesForOpenCL(
628     const SPIRVSubtarget &ST) {
629   // Add the min requirements for different OpenCL and SPIR-V versions.
630   addAvailableCaps({Capability::Addresses, Capability::Float16Buffer,
631                     Capability::Int16, Capability::Int8, Capability::Kernel,
632                     Capability::Linkage, Capability::Vector16,
633                     Capability::Groups, Capability::GenericPointer,
634                     Capability::Shader});
635   if (ST.hasOpenCLFullProfile())
636     addAvailableCaps({Capability::Int64, Capability::Int64Atomics});
637   if (ST.hasOpenCLImageSupport()) {
638     addAvailableCaps({Capability::ImageBasic, Capability::LiteralSampler,
639                       Capability::Image1D, Capability::SampledBuffer,
640                       Capability::ImageBuffer});
641     if (ST.isAtLeastOpenCLVer(VersionTuple(2, 0)))
642       addAvailableCaps({Capability::ImageReadWrite});
643   }
644   if (ST.isAtLeastSPIRVVer(VersionTuple(1, 1)) &&
645       ST.isAtLeastOpenCLVer(VersionTuple(2, 2)))
646     addAvailableCaps({Capability::SubgroupDispatch, Capability::PipeStorage});
647   if (ST.isAtLeastSPIRVVer(VersionTuple(1, 3)))
648     addAvailableCaps({Capability::GroupNonUniform,
649                       Capability::GroupNonUniformVote,
650                       Capability::GroupNonUniformArithmetic,
651                       Capability::GroupNonUniformBallot,
652                       Capability::GroupNonUniformClustered,
653                       Capability::GroupNonUniformShuffle,
654                       Capability::GroupNonUniformShuffleRelative});
655   if (ST.isAtLeastSPIRVVer(VersionTuple(1, 4)))
656     addAvailableCaps({Capability::DenormPreserve, Capability::DenormFlushToZero,
657                       Capability::SignedZeroInfNanPreserve,
658                       Capability::RoundingModeRTE,
659                       Capability::RoundingModeRTZ});
660   // TODO: verify if this needs some checks.
661   addAvailableCaps({Capability::Float16, Capability::Float64});
662 
663   // Add capabilities enabled by extensions.
664   for (auto Extension : ST.getAllAvailableExtensions()) {
665     CapabilityList EnabledCapabilities =
666         getCapabilitiesEnabledByExtension(Extension);
667     addAvailableCaps(EnabledCapabilities);
668   }
669 
670   // TODO: add OpenCL extensions.
671 }
672 
673 void RequirementHandler::initAvailableCapabilitiesForVulkan(
674     const SPIRVSubtarget &ST) {
675   addAvailableCaps({Capability::Shader, Capability::Linkage});
676 
677   // Provided by all supported Vulkan versions.
678   addAvailableCaps({Capability::Int16, Capability::Int64, Capability::Float16,
679                     Capability::Float64, Capability::GroupNonUniform});
680 }
681 
682 } // namespace SPIRV
683 } // namespace llvm
684 
685 // Add the required capabilities from a decoration instruction (including
686 // BuiltIns).
687 static void addOpDecorateReqs(const MachineInstr &MI, unsigned DecIndex,
688                               SPIRV::RequirementHandler &Reqs,
689                               const SPIRVSubtarget &ST) {
690   int64_t DecOp = MI.getOperand(DecIndex).getImm();
691   auto Dec = static_cast<SPIRV::Decoration::Decoration>(DecOp);
692   Reqs.addRequirements(getSymbolicOperandRequirements(
693       SPIRV::OperandCategory::DecorationOperand, Dec, ST, Reqs));
694 
695   if (Dec == SPIRV::Decoration::BuiltIn) {
696     int64_t BuiltInOp = MI.getOperand(DecIndex + 1).getImm();
697     auto BuiltIn = static_cast<SPIRV::BuiltIn::BuiltIn>(BuiltInOp);
698     Reqs.addRequirements(getSymbolicOperandRequirements(
699         SPIRV::OperandCategory::BuiltInOperand, BuiltIn, ST, Reqs));
700   } else if (Dec == SPIRV::Decoration::LinkageAttributes) {
701     int64_t LinkageOp = MI.getOperand(MI.getNumOperands() - 1).getImm();
702     SPIRV::LinkageType::LinkageType LnkType =
703         static_cast<SPIRV::LinkageType::LinkageType>(LinkageOp);
704     if (LnkType == SPIRV::LinkageType::LinkOnceODR)
705       Reqs.addExtension(SPIRV::Extension::SPV_KHR_linkonce_odr);
706   }
707 }
708 
709 // Add requirements for image handling.
710 static void addOpTypeImageReqs(const MachineInstr &MI,
711                                SPIRV::RequirementHandler &Reqs,
712                                const SPIRVSubtarget &ST) {
713   assert(MI.getNumOperands() >= 8 && "Insufficient operands for OpTypeImage");
714   // The operand indices used here are based on the OpTypeImage layout, which
715   // the MachineInstr follows as well.
716   int64_t ImgFormatOp = MI.getOperand(7).getImm();
717   auto ImgFormat = static_cast<SPIRV::ImageFormat::ImageFormat>(ImgFormatOp);
718   Reqs.getAndAddRequirements(SPIRV::OperandCategory::ImageFormatOperand,
719                              ImgFormat, ST);
720 
721   bool IsArrayed = MI.getOperand(4).getImm() == 1;
722   bool IsMultisampled = MI.getOperand(5).getImm() == 1;
723   bool NoSampler = MI.getOperand(6).getImm() == 2;
724   // Add dimension requirements.
725   assert(MI.getOperand(2).isImm());
726   switch (MI.getOperand(2).getImm()) {
727   case SPIRV::Dim::DIM_1D:
728     Reqs.addRequirements(NoSampler ? SPIRV::Capability::Image1D
729                                    : SPIRV::Capability::Sampled1D);
730     break;
731   case SPIRV::Dim::DIM_2D:
732     if (IsMultisampled && NoSampler)
733       Reqs.addRequirements(SPIRV::Capability::ImageMSArray);
734     break;
735   case SPIRV::Dim::DIM_Cube:
736     Reqs.addRequirements(SPIRV::Capability::Shader);
737     if (IsArrayed)
738       Reqs.addRequirements(NoSampler ? SPIRV::Capability::ImageCubeArray
739                                      : SPIRV::Capability::SampledCubeArray);
740     break;
741   case SPIRV::Dim::DIM_Rect:
742     Reqs.addRequirements(NoSampler ? SPIRV::Capability::ImageRect
743                                    : SPIRV::Capability::SampledRect);
744     break;
745   case SPIRV::Dim::DIM_Buffer:
746     Reqs.addRequirements(NoSampler ? SPIRV::Capability::ImageBuffer
747                                    : SPIRV::Capability::SampledBuffer);
748     break;
749   case SPIRV::Dim::DIM_SubpassData:
750     Reqs.addRequirements(SPIRV::Capability::InputAttachment);
751     break;
752   }
753 
754   // Has optional access qualifier.
755   // TODO: check if it's OpenCL's kernel.
756   if (MI.getNumOperands() > 8 &&
757       MI.getOperand(8).getImm() == SPIRV::AccessQualifier::ReadWrite)
758     Reqs.addRequirements(SPIRV::Capability::ImageReadWrite);
759   else
760     Reqs.addRequirements(SPIRV::Capability::ImageBasic);
761 }
762 
763 // Add requirements for handling atomic float instructions
764 #define ATOM_FLT_REQ_EXT_MSG(ExtName)                                          \
765   "The atomic float instruction requires the following SPIR-V "                \
766   "extension: SPV_EXT_shader_atomic_float" ExtName
767 static void AddAtomicFloatRequirements(const MachineInstr &MI,
768                                        SPIRV::RequirementHandler &Reqs,
769                                        const SPIRVSubtarget &ST) {
770   assert(MI.getOperand(1).isReg() &&
771          "Expect register operand in atomic float instruction");
772   Register TypeReg = MI.getOperand(1).getReg();
773   SPIRVType *TypeDef = MI.getMF()->getRegInfo().getVRegDef(TypeReg);
774   if (TypeDef->getOpcode() != SPIRV::OpTypeFloat)
775     report_fatal_error("Result type of an atomic float instruction must be a "
776                        "floating-point type scalar");
777 
778   unsigned BitWidth = TypeDef->getOperand(1).getImm();
779   unsigned Op = MI.getOpcode();
780   if (Op == SPIRV::OpAtomicFAddEXT) {
781     if (!ST.canUseExtension(SPIRV::Extension::SPV_EXT_shader_atomic_float_add))
782       report_fatal_error(ATOM_FLT_REQ_EXT_MSG("_add"), false);
783     Reqs.addExtension(SPIRV::Extension::SPV_EXT_shader_atomic_float_add);
784     switch (BitWidth) {
785     case 16:
786       if (!ST.canUseExtension(
787               SPIRV::Extension::SPV_EXT_shader_atomic_float16_add))
788         report_fatal_error(ATOM_FLT_REQ_EXT_MSG("16_add"), false);
789       Reqs.addExtension(SPIRV::Extension::SPV_EXT_shader_atomic_float16_add);
790       Reqs.addCapability(SPIRV::Capability::AtomicFloat16AddEXT);
791       break;
792     case 32:
793       Reqs.addCapability(SPIRV::Capability::AtomicFloat32AddEXT);
794       break;
795     case 64:
796       Reqs.addCapability(SPIRV::Capability::AtomicFloat64AddEXT);
797       break;
798     default:
799       report_fatal_error(
800           "Unexpected floating-point type width in atomic float instruction");
801     }
802   } else {
803     if (!ST.canUseExtension(
804             SPIRV::Extension::SPV_EXT_shader_atomic_float_min_max))
805       report_fatal_error(ATOM_FLT_REQ_EXT_MSG("_min_max"), false);
806     Reqs.addExtension(SPIRV::Extension::SPV_EXT_shader_atomic_float_min_max);
807     switch (BitWidth) {
808     case 16:
809       Reqs.addCapability(SPIRV::Capability::AtomicFloat16MinMaxEXT);
810       break;
811     case 32:
812       Reqs.addCapability(SPIRV::Capability::AtomicFloat32MinMaxEXT);
813       break;
814     case 64:
815       Reqs.addCapability(SPIRV::Capability::AtomicFloat64MinMaxEXT);
816       break;
817     default:
818       report_fatal_error(
819           "Unexpected floating-point type width in atomic float instruction");
820     }
821   }
822 }
823 
824 void addInstrRequirements(const MachineInstr &MI,
825                           SPIRV::RequirementHandler &Reqs,
826                           const SPIRVSubtarget &ST) {
827   switch (MI.getOpcode()) {
828   case SPIRV::OpMemoryModel: {
829     int64_t Addr = MI.getOperand(0).getImm();
830     Reqs.getAndAddRequirements(SPIRV::OperandCategory::AddressingModelOperand,
831                                Addr, ST);
832     int64_t Mem = MI.getOperand(1).getImm();
833     Reqs.getAndAddRequirements(SPIRV::OperandCategory::MemoryModelOperand, Mem,
834                                ST);
835     break;
836   }
837   case SPIRV::OpEntryPoint: {
838     int64_t Exe = MI.getOperand(0).getImm();
839     Reqs.getAndAddRequirements(SPIRV::OperandCategory::ExecutionModelOperand,
840                                Exe, ST);
841     break;
842   }
843   case SPIRV::OpExecutionMode:
844   case SPIRV::OpExecutionModeId: {
845     int64_t Exe = MI.getOperand(1).getImm();
846     Reqs.getAndAddRequirements(SPIRV::OperandCategory::ExecutionModeOperand,
847                                Exe, ST);
848     break;
849   }
850   case SPIRV::OpTypeMatrix:
851     Reqs.addCapability(SPIRV::Capability::Matrix);
852     break;
853   case SPIRV::OpTypeInt: {
854     unsigned BitWidth = MI.getOperand(1).getImm();
855     if (BitWidth == 64)
856       Reqs.addCapability(SPIRV::Capability::Int64);
857     else if (BitWidth == 16)
858       Reqs.addCapability(SPIRV::Capability::Int16);
859     else if (BitWidth == 8)
860       Reqs.addCapability(SPIRV::Capability::Int8);
861     break;
862   }
863   case SPIRV::OpTypeFloat: {
864     unsigned BitWidth = MI.getOperand(1).getImm();
865     if (BitWidth == 64)
866       Reqs.addCapability(SPIRV::Capability::Float64);
867     else if (BitWidth == 16)
868       Reqs.addCapability(SPIRV::Capability::Float16);
869     break;
870   }
871   case SPIRV::OpTypeVector: {
872     unsigned NumComponents = MI.getOperand(2).getImm();
873     if (NumComponents == 8 || NumComponents == 16)
874       Reqs.addCapability(SPIRV::Capability::Vector16);
875     break;
876   }
877   case SPIRV::OpTypePointer: {
878     auto SC = MI.getOperand(1).getImm();
879     Reqs.getAndAddRequirements(SPIRV::OperandCategory::StorageClassOperand, SC,
880                                ST);
881     // If it's a type of pointer to float16 targeting OpenCL, add Float16Buffer
882     // capability.
883     if (!ST.isOpenCLEnv())
884       break;
885     assert(MI.getOperand(2).isReg());
886     const MachineRegisterInfo &MRI = MI.getMF()->getRegInfo();
887     SPIRVType *TypeDef = MRI.getVRegDef(MI.getOperand(2).getReg());
888     if (TypeDef->getOpcode() == SPIRV::OpTypeFloat &&
889         TypeDef->getOperand(1).getImm() == 16)
890       Reqs.addCapability(SPIRV::Capability::Float16Buffer);
891     break;
892   }
893   case SPIRV::OpBitReverse:
894   case SPIRV::OpBitFieldInsert:
895   case SPIRV::OpBitFieldSExtract:
896   case SPIRV::OpBitFieldUExtract:
897     if (!ST.canUseExtension(SPIRV::Extension::SPV_KHR_bit_instructions)) {
898       Reqs.addCapability(SPIRV::Capability::Shader);
899       break;
900     }
901     Reqs.addExtension(SPIRV::Extension::SPV_KHR_bit_instructions);
902     Reqs.addCapability(SPIRV::Capability::BitInstructions);
903     break;
904   case SPIRV::OpTypeRuntimeArray:
905     Reqs.addCapability(SPIRV::Capability::Shader);
906     break;
907   case SPIRV::OpTypeOpaque:
908   case SPIRV::OpTypeEvent:
909     Reqs.addCapability(SPIRV::Capability::Kernel);
910     break;
911   case SPIRV::OpTypePipe:
912   case SPIRV::OpTypeReserveId:
913     Reqs.addCapability(SPIRV::Capability::Pipes);
914     break;
915   case SPIRV::OpTypeDeviceEvent:
916   case SPIRV::OpTypeQueue:
917   case SPIRV::OpBuildNDRange:
918     Reqs.addCapability(SPIRV::Capability::DeviceEnqueue);
919     break;
920   case SPIRV::OpDecorate:
921   case SPIRV::OpDecorateId:
922   case SPIRV::OpDecorateString:
923     addOpDecorateReqs(MI, 1, Reqs, ST);
924     break;
925   case SPIRV::OpMemberDecorate:
926   case SPIRV::OpMemberDecorateString:
927     addOpDecorateReqs(MI, 2, Reqs, ST);
928     break;
929   case SPIRV::OpInBoundsPtrAccessChain:
930     Reqs.addCapability(SPIRV::Capability::Addresses);
931     break;
932   case SPIRV::OpConstantSampler:
933     Reqs.addCapability(SPIRV::Capability::LiteralSampler);
934     break;
935   case SPIRV::OpTypeImage:
936     addOpTypeImageReqs(MI, Reqs, ST);
937     break;
938   case SPIRV::OpTypeSampler:
939     Reqs.addCapability(SPIRV::Capability::ImageBasic);
940     break;
941   case SPIRV::OpTypeForwardPointer:
942     // TODO: check if it's OpenCL's kernel.
943     Reqs.addCapability(SPIRV::Capability::Addresses);
944     break;
945   case SPIRV::OpAtomicFlagTestAndSet:
946   case SPIRV::OpAtomicLoad:
947   case SPIRV::OpAtomicStore:
948   case SPIRV::OpAtomicExchange:
949   case SPIRV::OpAtomicCompareExchange:
950   case SPIRV::OpAtomicIIncrement:
951   case SPIRV::OpAtomicIDecrement:
952   case SPIRV::OpAtomicIAdd:
953   case SPIRV::OpAtomicISub:
954   case SPIRV::OpAtomicUMin:
955   case SPIRV::OpAtomicUMax:
956   case SPIRV::OpAtomicSMin:
957   case SPIRV::OpAtomicSMax:
958   case SPIRV::OpAtomicAnd:
959   case SPIRV::OpAtomicOr:
960   case SPIRV::OpAtomicXor: {
961     const MachineRegisterInfo &MRI = MI.getMF()->getRegInfo();
962     const MachineInstr *InstrPtr = &MI;
963     if (MI.getOpcode() == SPIRV::OpAtomicStore) {
964       assert(MI.getOperand(3).isReg());
965       InstrPtr = MRI.getVRegDef(MI.getOperand(3).getReg());
966       assert(InstrPtr && "Unexpected type instruction for OpAtomicStore");
967     }
968     assert(InstrPtr->getOperand(1).isReg() && "Unexpected operand in atomic");
969     Register TypeReg = InstrPtr->getOperand(1).getReg();
970     SPIRVType *TypeDef = MRI.getVRegDef(TypeReg);
971     if (TypeDef->getOpcode() == SPIRV::OpTypeInt) {
972       unsigned BitWidth = TypeDef->getOperand(1).getImm();
973       if (BitWidth == 64)
974         Reqs.addCapability(SPIRV::Capability::Int64Atomics);
975     }
976     break;
977   }
978   case SPIRV::OpGroupNonUniformIAdd:
979   case SPIRV::OpGroupNonUniformFAdd:
980   case SPIRV::OpGroupNonUniformIMul:
981   case SPIRV::OpGroupNonUniformFMul:
982   case SPIRV::OpGroupNonUniformSMin:
983   case SPIRV::OpGroupNonUniformUMin:
984   case SPIRV::OpGroupNonUniformFMin:
985   case SPIRV::OpGroupNonUniformSMax:
986   case SPIRV::OpGroupNonUniformUMax:
987   case SPIRV::OpGroupNonUniformFMax:
988   case SPIRV::OpGroupNonUniformBitwiseAnd:
989   case SPIRV::OpGroupNonUniformBitwiseOr:
990   case SPIRV::OpGroupNonUniformBitwiseXor:
991   case SPIRV::OpGroupNonUniformLogicalAnd:
992   case SPIRV::OpGroupNonUniformLogicalOr:
993   case SPIRV::OpGroupNonUniformLogicalXor: {
994     assert(MI.getOperand(3).isImm());
995     int64_t GroupOp = MI.getOperand(3).getImm();
996     switch (GroupOp) {
997     case SPIRV::GroupOperation::Reduce:
998     case SPIRV::GroupOperation::InclusiveScan:
999     case SPIRV::GroupOperation::ExclusiveScan:
1000       Reqs.addCapability(SPIRV::Capability::Kernel);
1001       Reqs.addCapability(SPIRV::Capability::GroupNonUniformArithmetic);
1002       Reqs.addCapability(SPIRV::Capability::GroupNonUniformBallot);
1003       break;
1004     case SPIRV::GroupOperation::ClusteredReduce:
1005       Reqs.addCapability(SPIRV::Capability::GroupNonUniformClustered);
1006       break;
1007     case SPIRV::GroupOperation::PartitionedReduceNV:
1008     case SPIRV::GroupOperation::PartitionedInclusiveScanNV:
1009     case SPIRV::GroupOperation::PartitionedExclusiveScanNV:
1010       Reqs.addCapability(SPIRV::Capability::GroupNonUniformPartitionedNV);
1011       break;
1012     }
1013     break;
1014   }
1015   case SPIRV::OpGroupNonUniformShuffle:
1016   case SPIRV::OpGroupNonUniformShuffleXor:
1017     Reqs.addCapability(SPIRV::Capability::GroupNonUniformShuffle);
1018     break;
1019   case SPIRV::OpGroupNonUniformShuffleUp:
1020   case SPIRV::OpGroupNonUniformShuffleDown:
1021     Reqs.addCapability(SPIRV::Capability::GroupNonUniformShuffleRelative);
1022     break;
1023   case SPIRV::OpGroupAll:
1024   case SPIRV::OpGroupAny:
1025   case SPIRV::OpGroupBroadcast:
1026   case SPIRV::OpGroupIAdd:
1027   case SPIRV::OpGroupFAdd:
1028   case SPIRV::OpGroupFMin:
1029   case SPIRV::OpGroupUMin:
1030   case SPIRV::OpGroupSMin:
1031   case SPIRV::OpGroupFMax:
1032   case SPIRV::OpGroupUMax:
1033   case SPIRV::OpGroupSMax:
1034     Reqs.addCapability(SPIRV::Capability::Groups);
1035     break;
1036   case SPIRV::OpGroupNonUniformElect:
1037     Reqs.addCapability(SPIRV::Capability::GroupNonUniform);
1038     break;
1039   case SPIRV::OpGroupNonUniformAll:
1040   case SPIRV::OpGroupNonUniformAny:
1041   case SPIRV::OpGroupNonUniformAllEqual:
1042     Reqs.addCapability(SPIRV::Capability::GroupNonUniformVote);
1043     break;
1044   case SPIRV::OpGroupNonUniformBroadcast:
1045   case SPIRV::OpGroupNonUniformBroadcastFirst:
1046   case SPIRV::OpGroupNonUniformBallot:
1047   case SPIRV::OpGroupNonUniformInverseBallot:
1048   case SPIRV::OpGroupNonUniformBallotBitExtract:
1049   case SPIRV::OpGroupNonUniformBallotBitCount:
1050   case SPIRV::OpGroupNonUniformBallotFindLSB:
1051   case SPIRV::OpGroupNonUniformBallotFindMSB:
1052     Reqs.addCapability(SPIRV::Capability::GroupNonUniformBallot);
1053     break;
1054   case SPIRV::OpSubgroupShuffleINTEL:
1055   case SPIRV::OpSubgroupShuffleDownINTEL:
1056   case SPIRV::OpSubgroupShuffleUpINTEL:
1057   case SPIRV::OpSubgroupShuffleXorINTEL:
1058     if (ST.canUseExtension(SPIRV::Extension::SPV_INTEL_subgroups)) {
1059       Reqs.addExtension(SPIRV::Extension::SPV_INTEL_subgroups);
1060       Reqs.addCapability(SPIRV::Capability::SubgroupShuffleINTEL);
1061     }
1062     break;
1063   case SPIRV::OpSubgroupBlockReadINTEL:
1064   case SPIRV::OpSubgroupBlockWriteINTEL:
1065     if (ST.canUseExtension(SPIRV::Extension::SPV_INTEL_subgroups)) {
1066       Reqs.addExtension(SPIRV::Extension::SPV_INTEL_subgroups);
1067       Reqs.addCapability(SPIRV::Capability::SubgroupBufferBlockIOINTEL);
1068     }
1069     break;
1070   case SPIRV::OpSubgroupImageBlockReadINTEL:
1071   case SPIRV::OpSubgroupImageBlockWriteINTEL:
1072     if (ST.canUseExtension(SPIRV::Extension::SPV_INTEL_subgroups)) {
1073       Reqs.addExtension(SPIRV::Extension::SPV_INTEL_subgroups);
1074       Reqs.addCapability(SPIRV::Capability::SubgroupImageBlockIOINTEL);
1075     }
1076     break;
1077   case SPIRV::OpAssumeTrueKHR:
1078   case SPIRV::OpExpectKHR:
1079     if (ST.canUseExtension(SPIRV::Extension::SPV_KHR_expect_assume)) {
1080       Reqs.addExtension(SPIRV::Extension::SPV_KHR_expect_assume);
1081       Reqs.addCapability(SPIRV::Capability::ExpectAssumeKHR);
1082     }
1083     break;
1084   case SPIRV::OpPtrCastToCrossWorkgroupINTEL:
1085   case SPIRV::OpCrossWorkgroupCastToPtrINTEL:
1086     if (ST.canUseExtension(SPIRV::Extension::SPV_INTEL_usm_storage_classes)) {
1087       Reqs.addExtension(SPIRV::Extension::SPV_INTEL_usm_storage_classes);
1088       Reqs.addCapability(SPIRV::Capability::USMStorageClassesINTEL);
1089     }
1090     break;
1091   case SPIRV::OpConstantFunctionPointerINTEL:
1092     if (ST.canUseExtension(SPIRV::Extension::SPV_INTEL_function_pointers)) {
1093       Reqs.addExtension(SPIRV::Extension::SPV_INTEL_function_pointers);
1094       Reqs.addCapability(SPIRV::Capability::FunctionPointersINTEL);
1095     }
1096     break;
1097   case SPIRV::OpGroupNonUniformRotateKHR:
1098     if (!ST.canUseExtension(SPIRV::Extension::SPV_KHR_subgroup_rotate))
1099       report_fatal_error("OpGroupNonUniformRotateKHR instruction requires the "
1100                          "following SPIR-V extension: SPV_KHR_subgroup_rotate",
1101                          false);
1102     Reqs.addExtension(SPIRV::Extension::SPV_KHR_subgroup_rotate);
1103     Reqs.addCapability(SPIRV::Capability::GroupNonUniformRotateKHR);
1104     Reqs.addCapability(SPIRV::Capability::GroupNonUniform);
1105     break;
1106   case SPIRV::OpGroupIMulKHR:
1107   case SPIRV::OpGroupFMulKHR:
1108   case SPIRV::OpGroupBitwiseAndKHR:
1109   case SPIRV::OpGroupBitwiseOrKHR:
1110   case SPIRV::OpGroupBitwiseXorKHR:
1111   case SPIRV::OpGroupLogicalAndKHR:
1112   case SPIRV::OpGroupLogicalOrKHR:
1113   case SPIRV::OpGroupLogicalXorKHR:
1114     if (ST.canUseExtension(
1115             SPIRV::Extension::SPV_KHR_uniform_group_instructions)) {
1116       Reqs.addExtension(SPIRV::Extension::SPV_KHR_uniform_group_instructions);
1117       Reqs.addCapability(SPIRV::Capability::GroupUniformArithmeticKHR);
1118     }
1119     break;
1120   case SPIRV::OpFunctionPointerCallINTEL:
1121     if (ST.canUseExtension(SPIRV::Extension::SPV_INTEL_function_pointers)) {
1122       Reqs.addExtension(SPIRV::Extension::SPV_INTEL_function_pointers);
1123       Reqs.addCapability(SPIRV::Capability::FunctionPointersINTEL);
1124     }
1125     break;
1126   case SPIRV::OpAtomicFAddEXT:
1127   case SPIRV::OpAtomicFMinEXT:
1128   case SPIRV::OpAtomicFMaxEXT:
1129     AddAtomicFloatRequirements(MI, Reqs, ST);
1130     break;
1131   case SPIRV::OpConvertBF16ToFINTEL:
1132   case SPIRV::OpConvertFToBF16INTEL:
1133     if (ST.canUseExtension(SPIRV::Extension::SPV_INTEL_bfloat16_conversion)) {
1134       Reqs.addExtension(SPIRV::Extension::SPV_INTEL_bfloat16_conversion);
1135       Reqs.addCapability(SPIRV::Capability::BFloat16ConversionINTEL);
1136     }
1137     break;
1138   case SPIRV::OpVariableLengthArrayINTEL:
1139   case SPIRV::OpSaveMemoryINTEL:
1140   case SPIRV::OpRestoreMemoryINTEL:
1141     if (ST.canUseExtension(SPIRV::Extension::SPV_INTEL_variable_length_array)) {
1142       Reqs.addExtension(SPIRV::Extension::SPV_INTEL_variable_length_array);
1143       Reqs.addCapability(SPIRV::Capability::VariableLengthArrayINTEL);
1144     }
1145     break;
1146   default:
1147     break;
1148   }
1149 
1150   // If we require capability Shader, then we can remove the requirement for
1151   // the BitInstructions capability, since Shader is a superset capability
1152   // of BitInstructions.
1153   Reqs.removeCapabilityIf(SPIRV::Capability::BitInstructions,
1154                           SPIRV::Capability::Shader);
1155 }
1156 
1157 static void collectReqs(const Module &M, SPIRV::ModuleAnalysisInfo &MAI,
1158                         MachineModuleInfo *MMI, const SPIRVSubtarget &ST) {
1159   // Collect requirements for existing instructions.
1160   for (auto F = M.begin(), E = M.end(); F != E; ++F) {
1161     MachineFunction *MF = MMI->getMachineFunction(*F);
1162     if (!MF)
1163       continue;
1164     for (const MachineBasicBlock &MBB : *MF)
1165       for (const MachineInstr &MI : MBB)
1166         addInstrRequirements(MI, MAI.Reqs, ST);
1167   }
1168   // Collect requirements for OpExecutionMode instructions.
1169   auto Node = M.getNamedMetadata("spirv.ExecutionMode");
1170   if (Node) {
1171     // SPV_KHR_float_controls is not available until v1.4
1172     bool RequireFloatControls = false,
1173          VerLower14 = !ST.isAtLeastSPIRVVer(VersionTuple(1, 4));
1174     for (unsigned i = 0; i < Node->getNumOperands(); i++) {
1175       MDNode *MDN = cast<MDNode>(Node->getOperand(i));
1176       const MDOperand &MDOp = MDN->getOperand(1);
1177       if (auto *CMeta = dyn_cast<ConstantAsMetadata>(MDOp)) {
1178         Constant *C = CMeta->getValue();
1179         if (ConstantInt *Const = dyn_cast<ConstantInt>(C)) {
1180           auto EM = Const->getZExtValue();
1181           MAI.Reqs.getAndAddRequirements(
1182               SPIRV::OperandCategory::ExecutionModeOperand, EM, ST);
1183           // add SPV_KHR_float_controls if the version is too low
1184           switch (EM) {
1185           case SPIRV::ExecutionMode::DenormPreserve:
1186           case SPIRV::ExecutionMode::DenormFlushToZero:
1187           case SPIRV::ExecutionMode::SignedZeroInfNanPreserve:
1188           case SPIRV::ExecutionMode::RoundingModeRTE:
1189           case SPIRV::ExecutionMode::RoundingModeRTZ:
1190             RequireFloatControls = VerLower14;
1191             break;
1192           }
1193         }
1194       }
1195     }
1196     if (RequireFloatControls &&
1197         ST.canUseExtension(SPIRV::Extension::SPV_KHR_float_controls))
1198       MAI.Reqs.addExtension(SPIRV::Extension::SPV_KHR_float_controls);
1199   }
1200   for (auto FI = M.begin(), E = M.end(); FI != E; ++FI) {
1201     const Function &F = *FI;
1202     if (F.isDeclaration())
1203       continue;
1204     if (F.getMetadata("reqd_work_group_size"))
1205       MAI.Reqs.getAndAddRequirements(
1206           SPIRV::OperandCategory::ExecutionModeOperand,
1207           SPIRV::ExecutionMode::LocalSize, ST);
1208     if (F.getFnAttribute("hlsl.numthreads").isValid()) {
1209       MAI.Reqs.getAndAddRequirements(
1210           SPIRV::OperandCategory::ExecutionModeOperand,
1211           SPIRV::ExecutionMode::LocalSize, ST);
1212     }
1213     if (F.getMetadata("work_group_size_hint"))
1214       MAI.Reqs.getAndAddRequirements(
1215           SPIRV::OperandCategory::ExecutionModeOperand,
1216           SPIRV::ExecutionMode::LocalSizeHint, ST);
1217     if (F.getMetadata("intel_reqd_sub_group_size"))
1218       MAI.Reqs.getAndAddRequirements(
1219           SPIRV::OperandCategory::ExecutionModeOperand,
1220           SPIRV::ExecutionMode::SubgroupSize, ST);
1221     if (F.getMetadata("vec_type_hint"))
1222       MAI.Reqs.getAndAddRequirements(
1223           SPIRV::OperandCategory::ExecutionModeOperand,
1224           SPIRV::ExecutionMode::VecTypeHint, ST);
1225 
1226     if (F.hasOptNone() &&
1227         ST.canUseExtension(SPIRV::Extension::SPV_INTEL_optnone)) {
1228       // Output OpCapability OptNoneINTEL.
1229       MAI.Reqs.addExtension(SPIRV::Extension::SPV_INTEL_optnone);
1230       MAI.Reqs.addCapability(SPIRV::Capability::OptNoneINTEL);
1231     }
1232   }
1233 }
1234 
1235 static unsigned getFastMathFlags(const MachineInstr &I) {
1236   unsigned Flags = SPIRV::FPFastMathMode::None;
1237   if (I.getFlag(MachineInstr::MIFlag::FmNoNans))
1238     Flags |= SPIRV::FPFastMathMode::NotNaN;
1239   if (I.getFlag(MachineInstr::MIFlag::FmNoInfs))
1240     Flags |= SPIRV::FPFastMathMode::NotInf;
1241   if (I.getFlag(MachineInstr::MIFlag::FmNsz))
1242     Flags |= SPIRV::FPFastMathMode::NSZ;
1243   if (I.getFlag(MachineInstr::MIFlag::FmArcp))
1244     Flags |= SPIRV::FPFastMathMode::AllowRecip;
1245   if (I.getFlag(MachineInstr::MIFlag::FmReassoc))
1246     Flags |= SPIRV::FPFastMathMode::Fast;
1247   return Flags;
1248 }
1249 
1250 static void handleMIFlagDecoration(MachineInstr &I, const SPIRVSubtarget &ST,
1251                                    const SPIRVInstrInfo &TII,
1252                                    SPIRV::RequirementHandler &Reqs) {
1253   if (I.getFlag(MachineInstr::MIFlag::NoSWrap) && TII.canUseNSW(I) &&
1254       getSymbolicOperandRequirements(SPIRV::OperandCategory::DecorationOperand,
1255                                      SPIRV::Decoration::NoSignedWrap, ST, Reqs)
1256           .IsSatisfiable) {
1257     buildOpDecorate(I.getOperand(0).getReg(), I, TII,
1258                     SPIRV::Decoration::NoSignedWrap, {});
1259   }
1260   if (I.getFlag(MachineInstr::MIFlag::NoUWrap) && TII.canUseNUW(I) &&
1261       getSymbolicOperandRequirements(SPIRV::OperandCategory::DecorationOperand,
1262                                      SPIRV::Decoration::NoUnsignedWrap, ST,
1263                                      Reqs)
1264           .IsSatisfiable) {
1265     buildOpDecorate(I.getOperand(0).getReg(), I, TII,
1266                     SPIRV::Decoration::NoUnsignedWrap, {});
1267   }
1268   if (!TII.canUseFastMathFlags(I))
1269     return;
1270   unsigned FMFlags = getFastMathFlags(I);
1271   if (FMFlags == SPIRV::FPFastMathMode::None)
1272     return;
1273   Register DstReg = I.getOperand(0).getReg();
1274   buildOpDecorate(DstReg, I, TII, SPIRV::Decoration::FPFastMathMode, {FMFlags});
1275 }
1276 
1277 // Walk all functions and add decorations related to MI flags.
1278 static void addDecorations(const Module &M, const SPIRVInstrInfo &TII,
1279                            MachineModuleInfo *MMI, const SPIRVSubtarget &ST,
1280                            SPIRV::ModuleAnalysisInfo &MAI) {
1281   for (auto F = M.begin(), E = M.end(); F != E; ++F) {
1282     MachineFunction *MF = MMI->getMachineFunction(*F);
1283     if (!MF)
1284       continue;
1285     for (auto &MBB : *MF)
1286       for (auto &MI : MBB)
1287         handleMIFlagDecoration(MI, ST, TII, MAI.Reqs);
1288   }
1289 }
1290 
1291 struct SPIRV::ModuleAnalysisInfo SPIRVModuleAnalysis::MAI;
1292 
1293 void SPIRVModuleAnalysis::getAnalysisUsage(AnalysisUsage &AU) const {
1294   AU.addRequired<TargetPassConfig>();
1295   AU.addRequired<MachineModuleInfoWrapperPass>();
1296 }
1297 
1298 bool SPIRVModuleAnalysis::runOnModule(Module &M) {
1299   SPIRVTargetMachine &TM =
1300       getAnalysis<TargetPassConfig>().getTM<SPIRVTargetMachine>();
1301   ST = TM.getSubtargetImpl();
1302   GR = ST->getSPIRVGlobalRegistry();
1303   TII = ST->getInstrInfo();
1304 
1305   MMI = &getAnalysis<MachineModuleInfoWrapperPass>().getMMI();
1306 
1307   setBaseInfo(M);
1308 
1309   addDecorations(M, *TII, MMI, *ST, MAI);
1310 
1311   collectReqs(M, MAI, MMI, *ST);
1312 
1313   // Process type/const/global var/func decl instructions, number their
1314   // destination registers from 0 to N, collect Extensions and Capabilities.
1315   processDefInstrs(M);
1316 
1317   // Number rest of registers from N+1 onwards.
1318   numberRegistersGlobally(M);
1319 
1320   // Update references to OpFunction instructions to use Global Registers
1321   if (GR->hasConstFunPtr())
1322     collectFuncPtrs();
1323 
1324   // Collect OpName, OpEntryPoint, OpDecorate etc, process other instructions.
1325   processOtherInstrs(M);
1326 
1327   // If there are no entry points, we need the Linkage capability.
1328   if (MAI.MS[SPIRV::MB_EntryPoints].empty())
1329     MAI.Reqs.addCapability(SPIRV::Capability::Linkage);
1330 
1331   // Set maximum ID used.
1332   GR->setBound(MAI.MaxID);
1333 
1334   return false;
1335 }
1336