File: | clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp |
Warning: | line 3678, column 8 Called C++ object pointer is null |
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1 | //===---- CGOpenMPRuntimeGPU.cpp - Interface to OpenMP GPU Runtimes ----===// | |||
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 provides a generalized class for OpenMP runtime code generation | |||
10 | // specialized by GPU targets NVPTX and AMDGCN. | |||
11 | // | |||
12 | //===----------------------------------------------------------------------===// | |||
13 | ||||
14 | #include "CGOpenMPRuntimeGPU.h" | |||
15 | #include "CGOpenMPRuntimeNVPTX.h" | |||
16 | #include "CodeGenFunction.h" | |||
17 | #include "clang/AST/Attr.h" | |||
18 | #include "clang/AST/DeclOpenMP.h" | |||
19 | #include "clang/AST/StmtOpenMP.h" | |||
20 | #include "clang/AST/StmtVisitor.h" | |||
21 | #include "clang/Basic/Cuda.h" | |||
22 | #include "llvm/ADT/SmallPtrSet.h" | |||
23 | #include "llvm/Frontend/OpenMP/OMPGridValues.h" | |||
24 | #include "llvm/IR/IntrinsicsNVPTX.h" | |||
25 | #include "llvm/Support/MathExtras.h" | |||
26 | ||||
27 | using namespace clang; | |||
28 | using namespace CodeGen; | |||
29 | using namespace llvm::omp; | |||
30 | ||||
31 | namespace { | |||
32 | /// Pre(post)-action for different OpenMP constructs specialized for NVPTX. | |||
33 | class NVPTXActionTy final : public PrePostActionTy { | |||
34 | llvm::FunctionCallee EnterCallee = nullptr; | |||
35 | ArrayRef<llvm::Value *> EnterArgs; | |||
36 | llvm::FunctionCallee ExitCallee = nullptr; | |||
37 | ArrayRef<llvm::Value *> ExitArgs; | |||
38 | bool Conditional = false; | |||
39 | llvm::BasicBlock *ContBlock = nullptr; | |||
40 | ||||
41 | public: | |||
42 | NVPTXActionTy(llvm::FunctionCallee EnterCallee, | |||
43 | ArrayRef<llvm::Value *> EnterArgs, | |||
44 | llvm::FunctionCallee ExitCallee, | |||
45 | ArrayRef<llvm::Value *> ExitArgs, bool Conditional = false) | |||
46 | : EnterCallee(EnterCallee), EnterArgs(EnterArgs), ExitCallee(ExitCallee), | |||
47 | ExitArgs(ExitArgs), Conditional(Conditional) {} | |||
48 | void Enter(CodeGenFunction &CGF) override { | |||
49 | llvm::Value *EnterRes = CGF.EmitRuntimeCall(EnterCallee, EnterArgs); | |||
50 | if (Conditional) { | |||
51 | llvm::Value *CallBool = CGF.Builder.CreateIsNotNull(EnterRes); | |||
52 | auto *ThenBlock = CGF.createBasicBlock("omp_if.then"); | |||
53 | ContBlock = CGF.createBasicBlock("omp_if.end"); | |||
54 | // Generate the branch (If-stmt) | |||
55 | CGF.Builder.CreateCondBr(CallBool, ThenBlock, ContBlock); | |||
56 | CGF.EmitBlock(ThenBlock); | |||
57 | } | |||
58 | } | |||
59 | void Done(CodeGenFunction &CGF) { | |||
60 | // Emit the rest of blocks/branches | |||
61 | CGF.EmitBranch(ContBlock); | |||
62 | CGF.EmitBlock(ContBlock, true); | |||
63 | } | |||
64 | void Exit(CodeGenFunction &CGF) override { | |||
65 | CGF.EmitRuntimeCall(ExitCallee, ExitArgs); | |||
66 | } | |||
67 | }; | |||
68 | ||||
69 | /// A class to track the execution mode when codegening directives within | |||
70 | /// a target region. The appropriate mode (SPMD|NON-SPMD) is set on entry | |||
71 | /// to the target region and used by containing directives such as 'parallel' | |||
72 | /// to emit optimized code. | |||
73 | class ExecutionRuntimeModesRAII { | |||
74 | private: | |||
75 | CGOpenMPRuntimeGPU::ExecutionMode SavedExecMode = | |||
76 | CGOpenMPRuntimeGPU::EM_Unknown; | |||
77 | CGOpenMPRuntimeGPU::ExecutionMode &ExecMode; | |||
78 | bool SavedRuntimeMode = false; | |||
79 | bool *RuntimeMode = nullptr; | |||
80 | ||||
81 | public: | |||
82 | /// Constructor for Non-SPMD mode. | |||
83 | ExecutionRuntimeModesRAII(CGOpenMPRuntimeGPU::ExecutionMode &ExecMode) | |||
84 | : ExecMode(ExecMode) { | |||
85 | SavedExecMode = ExecMode; | |||
86 | ExecMode = CGOpenMPRuntimeGPU::EM_NonSPMD; | |||
87 | } | |||
88 | /// Constructor for SPMD mode. | |||
89 | ExecutionRuntimeModesRAII(CGOpenMPRuntimeGPU::ExecutionMode &ExecMode, | |||
90 | bool &RuntimeMode, bool FullRuntimeMode) | |||
91 | : ExecMode(ExecMode), RuntimeMode(&RuntimeMode) { | |||
92 | SavedExecMode = ExecMode; | |||
93 | SavedRuntimeMode = RuntimeMode; | |||
94 | ExecMode = CGOpenMPRuntimeGPU::EM_SPMD; | |||
95 | RuntimeMode = FullRuntimeMode; | |||
96 | } | |||
97 | ~ExecutionRuntimeModesRAII() { | |||
98 | ExecMode = SavedExecMode; | |||
99 | if (RuntimeMode) | |||
100 | *RuntimeMode = SavedRuntimeMode; | |||
101 | } | |||
102 | }; | |||
103 | ||||
104 | /// GPU Configuration: This information can be derived from cuda registers, | |||
105 | /// however, providing compile time constants helps generate more efficient | |||
106 | /// code. For all practical purposes this is fine because the configuration | |||
107 | /// is the same for all known NVPTX architectures. | |||
108 | enum MachineConfiguration : unsigned { | |||
109 | /// See "llvm/Frontend/OpenMP/OMPGridValues.h" for various related target | |||
110 | /// specific Grid Values like GV_Warp_Size, GV_Slot_Size | |||
111 | ||||
112 | /// Global memory alignment for performance. | |||
113 | GlobalMemoryAlignment = 128, | |||
114 | ||||
115 | /// Maximal size of the shared memory buffer. | |||
116 | SharedMemorySize = 128, | |||
117 | }; | |||
118 | ||||
119 | static const ValueDecl *getPrivateItem(const Expr *RefExpr) { | |||
120 | RefExpr = RefExpr->IgnoreParens(); | |||
121 | if (const auto *ASE = dyn_cast<ArraySubscriptExpr>(RefExpr)) { | |||
122 | const Expr *Base = ASE->getBase()->IgnoreParenImpCasts(); | |||
123 | while (const auto *TempASE = dyn_cast<ArraySubscriptExpr>(Base)) | |||
124 | Base = TempASE->getBase()->IgnoreParenImpCasts(); | |||
125 | RefExpr = Base; | |||
126 | } else if (auto *OASE = dyn_cast<OMPArraySectionExpr>(RefExpr)) { | |||
127 | const Expr *Base = OASE->getBase()->IgnoreParenImpCasts(); | |||
128 | while (const auto *TempOASE = dyn_cast<OMPArraySectionExpr>(Base)) | |||
129 | Base = TempOASE->getBase()->IgnoreParenImpCasts(); | |||
130 | while (const auto *TempASE = dyn_cast<ArraySubscriptExpr>(Base)) | |||
131 | Base = TempASE->getBase()->IgnoreParenImpCasts(); | |||
132 | RefExpr = Base; | |||
133 | } | |||
134 | RefExpr = RefExpr->IgnoreParenImpCasts(); | |||
135 | if (const auto *DE = dyn_cast<DeclRefExpr>(RefExpr)) | |||
136 | return cast<ValueDecl>(DE->getDecl()->getCanonicalDecl()); | |||
137 | const auto *ME = cast<MemberExpr>(RefExpr); | |||
138 | return cast<ValueDecl>(ME->getMemberDecl()->getCanonicalDecl()); | |||
139 | } | |||
140 | ||||
141 | ||||
142 | static RecordDecl *buildRecordForGlobalizedVars( | |||
143 | ASTContext &C, ArrayRef<const ValueDecl *> EscapedDecls, | |||
144 | ArrayRef<const ValueDecl *> EscapedDeclsForTeams, | |||
145 | llvm::SmallDenseMap<const ValueDecl *, const FieldDecl *> | |||
146 | &MappedDeclsFields, int BufSize) { | |||
147 | using VarsDataTy = std::pair<CharUnits /*Align*/, const ValueDecl *>; | |||
148 | if (EscapedDecls.empty() && EscapedDeclsForTeams.empty()) | |||
149 | return nullptr; | |||
150 | SmallVector<VarsDataTy, 4> GlobalizedVars; | |||
151 | for (const ValueDecl *D : EscapedDecls) | |||
152 | GlobalizedVars.emplace_back( | |||
153 | CharUnits::fromQuantity(std::max( | |||
154 | C.getDeclAlign(D).getQuantity(), | |||
155 | static_cast<CharUnits::QuantityType>(GlobalMemoryAlignment))), | |||
156 | D); | |||
157 | for (const ValueDecl *D : EscapedDeclsForTeams) | |||
158 | GlobalizedVars.emplace_back(C.getDeclAlign(D), D); | |||
159 | llvm::stable_sort(GlobalizedVars, [](VarsDataTy L, VarsDataTy R) { | |||
160 | return L.first > R.first; | |||
161 | }); | |||
162 | ||||
163 | // Build struct _globalized_locals_ty { | |||
164 | // /* globalized vars */[WarSize] align (max(decl_align, | |||
165 | // GlobalMemoryAlignment)) | |||
166 | // /* globalized vars */ for EscapedDeclsForTeams | |||
167 | // }; | |||
168 | RecordDecl *GlobalizedRD = C.buildImplicitRecord("_globalized_locals_ty"); | |||
169 | GlobalizedRD->startDefinition(); | |||
170 | llvm::SmallPtrSet<const ValueDecl *, 16> SingleEscaped( | |||
171 | EscapedDeclsForTeams.begin(), EscapedDeclsForTeams.end()); | |||
172 | for (const auto &Pair : GlobalizedVars) { | |||
173 | const ValueDecl *VD = Pair.second; | |||
174 | QualType Type = VD->getType(); | |||
175 | if (Type->isLValueReferenceType()) | |||
176 | Type = C.getPointerType(Type.getNonReferenceType()); | |||
177 | else | |||
178 | Type = Type.getNonReferenceType(); | |||
179 | SourceLocation Loc = VD->getLocation(); | |||
180 | FieldDecl *Field; | |||
181 | if (SingleEscaped.count(VD)) { | |||
182 | Field = FieldDecl::Create( | |||
183 | C, GlobalizedRD, Loc, Loc, VD->getIdentifier(), Type, | |||
184 | C.getTrivialTypeSourceInfo(Type, SourceLocation()), | |||
185 | /*BW=*/nullptr, /*Mutable=*/false, | |||
186 | /*InitStyle=*/ICIS_NoInit); | |||
187 | Field->setAccess(AS_public); | |||
188 | if (VD->hasAttrs()) { | |||
189 | for (specific_attr_iterator<AlignedAttr> I(VD->getAttrs().begin()), | |||
190 | E(VD->getAttrs().end()); | |||
191 | I != E; ++I) | |||
192 | Field->addAttr(*I); | |||
193 | } | |||
194 | } else { | |||
195 | llvm::APInt ArraySize(32, BufSize); | |||
196 | Type = C.getConstantArrayType(Type, ArraySize, nullptr, ArrayType::Normal, | |||
197 | 0); | |||
198 | Field = FieldDecl::Create( | |||
199 | C, GlobalizedRD, Loc, Loc, VD->getIdentifier(), Type, | |||
200 | C.getTrivialTypeSourceInfo(Type, SourceLocation()), | |||
201 | /*BW=*/nullptr, /*Mutable=*/false, | |||
202 | /*InitStyle=*/ICIS_NoInit); | |||
203 | Field->setAccess(AS_public); | |||
204 | llvm::APInt Align(32, std::max(C.getDeclAlign(VD).getQuantity(), | |||
205 | static_cast<CharUnits::QuantityType>( | |||
206 | GlobalMemoryAlignment))); | |||
207 | Field->addAttr(AlignedAttr::CreateImplicit( | |||
208 | C, /*IsAlignmentExpr=*/true, | |||
209 | IntegerLiteral::Create(C, Align, | |||
210 | C.getIntTypeForBitwidth(32, /*Signed=*/0), | |||
211 | SourceLocation()), | |||
212 | {}, AttributeCommonInfo::AS_GNU, AlignedAttr::GNU_aligned)); | |||
213 | } | |||
214 | GlobalizedRD->addDecl(Field); | |||
215 | MappedDeclsFields.try_emplace(VD, Field); | |||
216 | } | |||
217 | GlobalizedRD->completeDefinition(); | |||
218 | return GlobalizedRD; | |||
219 | } | |||
220 | ||||
221 | /// Get the list of variables that can escape their declaration context. | |||
222 | class CheckVarsEscapingDeclContext final | |||
223 | : public ConstStmtVisitor<CheckVarsEscapingDeclContext> { | |||
224 | CodeGenFunction &CGF; | |||
225 | llvm::SetVector<const ValueDecl *> EscapedDecls; | |||
226 | llvm::SetVector<const ValueDecl *> EscapedVariableLengthDecls; | |||
227 | llvm::SmallPtrSet<const Decl *, 4> EscapedParameters; | |||
228 | RecordDecl *GlobalizedRD = nullptr; | |||
229 | llvm::SmallDenseMap<const ValueDecl *, const FieldDecl *> MappedDeclsFields; | |||
230 | bool AllEscaped = false; | |||
231 | bool IsForCombinedParallelRegion = false; | |||
232 | ||||
233 | void markAsEscaped(const ValueDecl *VD) { | |||
234 | // Do not globalize declare target variables. | |||
235 | if (!isa<VarDecl>(VD) || | |||
236 | OMPDeclareTargetDeclAttr::isDeclareTargetDeclaration(VD)) | |||
237 | return; | |||
238 | VD = cast<ValueDecl>(VD->getCanonicalDecl()); | |||
239 | // Use user-specified allocation. | |||
240 | if (VD->hasAttrs() && VD->hasAttr<OMPAllocateDeclAttr>()) | |||
241 | return; | |||
242 | // Variables captured by value must be globalized. | |||
243 | if (auto *CSI = CGF.CapturedStmtInfo) { | |||
244 | if (const FieldDecl *FD = CSI->lookup(cast<VarDecl>(VD))) { | |||
245 | // Check if need to capture the variable that was already captured by | |||
246 | // value in the outer region. | |||
247 | if (!IsForCombinedParallelRegion) { | |||
248 | if (!FD->hasAttrs()) | |||
249 | return; | |||
250 | const auto *Attr = FD->getAttr<OMPCaptureKindAttr>(); | |||
251 | if (!Attr) | |||
252 | return; | |||
253 | if (((Attr->getCaptureKind() != OMPC_map) && | |||
254 | !isOpenMPPrivate(Attr->getCaptureKind())) || | |||
255 | ((Attr->getCaptureKind() == OMPC_map) && | |||
256 | !FD->getType()->isAnyPointerType())) | |||
257 | return; | |||
258 | } | |||
259 | if (!FD->getType()->isReferenceType()) { | |||
260 | assert(!VD->getType()->isVariablyModifiedType() &&(static_cast <bool> (!VD->getType()->isVariablyModifiedType () && "Parameter captured by value with variably modified type" ) ? void (0) : __assert_fail ("!VD->getType()->isVariablyModifiedType() && \"Parameter captured by value with variably modified type\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 261, __extension__ __PRETTY_FUNCTION__)) | |||
261 | "Parameter captured by value with variably modified type")(static_cast <bool> (!VD->getType()->isVariablyModifiedType () && "Parameter captured by value with variably modified type" ) ? void (0) : __assert_fail ("!VD->getType()->isVariablyModifiedType() && \"Parameter captured by value with variably modified type\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 261, __extension__ __PRETTY_FUNCTION__)); | |||
262 | EscapedParameters.insert(VD); | |||
263 | } else if (!IsForCombinedParallelRegion) { | |||
264 | return; | |||
265 | } | |||
266 | } | |||
267 | } | |||
268 | if ((!CGF.CapturedStmtInfo || | |||
269 | (IsForCombinedParallelRegion && CGF.CapturedStmtInfo)) && | |||
270 | VD->getType()->isReferenceType()) | |||
271 | // Do not globalize variables with reference type. | |||
272 | return; | |||
273 | if (VD->getType()->isVariablyModifiedType()) | |||
274 | EscapedVariableLengthDecls.insert(VD); | |||
275 | else | |||
276 | EscapedDecls.insert(VD); | |||
277 | } | |||
278 | ||||
279 | void VisitValueDecl(const ValueDecl *VD) { | |||
280 | if (VD->getType()->isLValueReferenceType()) | |||
281 | markAsEscaped(VD); | |||
282 | if (const auto *VarD = dyn_cast<VarDecl>(VD)) { | |||
283 | if (!isa<ParmVarDecl>(VarD) && VarD->hasInit()) { | |||
284 | const bool SavedAllEscaped = AllEscaped; | |||
285 | AllEscaped = VD->getType()->isLValueReferenceType(); | |||
286 | Visit(VarD->getInit()); | |||
287 | AllEscaped = SavedAllEscaped; | |||
288 | } | |||
289 | } | |||
290 | } | |||
291 | void VisitOpenMPCapturedStmt(const CapturedStmt *S, | |||
292 | ArrayRef<OMPClause *> Clauses, | |||
293 | bool IsCombinedParallelRegion) { | |||
294 | if (!S) | |||
295 | return; | |||
296 | for (const CapturedStmt::Capture &C : S->captures()) { | |||
297 | if (C.capturesVariable() && !C.capturesVariableByCopy()) { | |||
298 | const ValueDecl *VD = C.getCapturedVar(); | |||
299 | bool SavedIsForCombinedParallelRegion = IsForCombinedParallelRegion; | |||
300 | if (IsCombinedParallelRegion) { | |||
301 | // Check if the variable is privatized in the combined construct and | |||
302 | // those private copies must be shared in the inner parallel | |||
303 | // directive. | |||
304 | IsForCombinedParallelRegion = false; | |||
305 | for (const OMPClause *C : Clauses) { | |||
306 | if (!isOpenMPPrivate(C->getClauseKind()) || | |||
307 | C->getClauseKind() == OMPC_reduction || | |||
308 | C->getClauseKind() == OMPC_linear || | |||
309 | C->getClauseKind() == OMPC_private) | |||
310 | continue; | |||
311 | ArrayRef<const Expr *> Vars; | |||
312 | if (const auto *PC = dyn_cast<OMPFirstprivateClause>(C)) | |||
313 | Vars = PC->getVarRefs(); | |||
314 | else if (const auto *PC = dyn_cast<OMPLastprivateClause>(C)) | |||
315 | Vars = PC->getVarRefs(); | |||
316 | else | |||
317 | llvm_unreachable("Unexpected clause.")::llvm::llvm_unreachable_internal("Unexpected clause.", "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 317); | |||
318 | for (const auto *E : Vars) { | |||
319 | const Decl *D = | |||
320 | cast<DeclRefExpr>(E)->getDecl()->getCanonicalDecl(); | |||
321 | if (D == VD->getCanonicalDecl()) { | |||
322 | IsForCombinedParallelRegion = true; | |||
323 | break; | |||
324 | } | |||
325 | } | |||
326 | if (IsForCombinedParallelRegion) | |||
327 | break; | |||
328 | } | |||
329 | } | |||
330 | markAsEscaped(VD); | |||
331 | if (isa<OMPCapturedExprDecl>(VD)) | |||
332 | VisitValueDecl(VD); | |||
333 | IsForCombinedParallelRegion = SavedIsForCombinedParallelRegion; | |||
334 | } | |||
335 | } | |||
336 | } | |||
337 | ||||
338 | void buildRecordForGlobalizedVars(bool IsInTTDRegion) { | |||
339 | assert(!GlobalizedRD &&(static_cast <bool> (!GlobalizedRD && "Record for globalized variables is built already." ) ? void (0) : __assert_fail ("!GlobalizedRD && \"Record for globalized variables is built already.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 340, __extension__ __PRETTY_FUNCTION__)) | |||
340 | "Record for globalized variables is built already.")(static_cast <bool> (!GlobalizedRD && "Record for globalized variables is built already." ) ? void (0) : __assert_fail ("!GlobalizedRD && \"Record for globalized variables is built already.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 340, __extension__ __PRETTY_FUNCTION__)); | |||
341 | ArrayRef<const ValueDecl *> EscapedDeclsForParallel, EscapedDeclsForTeams; | |||
342 | unsigned WarpSize = CGF.getTarget().getGridValue().GV_Warp_Size; | |||
343 | if (IsInTTDRegion) | |||
344 | EscapedDeclsForTeams = EscapedDecls.getArrayRef(); | |||
345 | else | |||
346 | EscapedDeclsForParallel = EscapedDecls.getArrayRef(); | |||
347 | GlobalizedRD = ::buildRecordForGlobalizedVars( | |||
348 | CGF.getContext(), EscapedDeclsForParallel, EscapedDeclsForTeams, | |||
349 | MappedDeclsFields, WarpSize); | |||
350 | } | |||
351 | ||||
352 | public: | |||
353 | CheckVarsEscapingDeclContext(CodeGenFunction &CGF, | |||
354 | ArrayRef<const ValueDecl *> TeamsReductions) | |||
355 | : CGF(CGF), EscapedDecls(TeamsReductions.begin(), TeamsReductions.end()) { | |||
356 | } | |||
357 | virtual ~CheckVarsEscapingDeclContext() = default; | |||
358 | void VisitDeclStmt(const DeclStmt *S) { | |||
359 | if (!S) | |||
360 | return; | |||
361 | for (const Decl *D : S->decls()) | |||
362 | if (const auto *VD = dyn_cast_or_null<ValueDecl>(D)) | |||
363 | VisitValueDecl(VD); | |||
364 | } | |||
365 | void VisitOMPExecutableDirective(const OMPExecutableDirective *D) { | |||
366 | if (!D) | |||
367 | return; | |||
368 | if (!D->hasAssociatedStmt()) | |||
369 | return; | |||
370 | if (const auto *S = | |||
371 | dyn_cast_or_null<CapturedStmt>(D->getAssociatedStmt())) { | |||
372 | // Do not analyze directives that do not actually require capturing, | |||
373 | // like `omp for` or `omp simd` directives. | |||
374 | llvm::SmallVector<OpenMPDirectiveKind, 4> CaptureRegions; | |||
375 | getOpenMPCaptureRegions(CaptureRegions, D->getDirectiveKind()); | |||
376 | if (CaptureRegions.size() == 1 && CaptureRegions.back() == OMPD_unknown) { | |||
377 | VisitStmt(S->getCapturedStmt()); | |||
378 | return; | |||
379 | } | |||
380 | VisitOpenMPCapturedStmt( | |||
381 | S, D->clauses(), | |||
382 | CaptureRegions.back() == OMPD_parallel && | |||
383 | isOpenMPDistributeDirective(D->getDirectiveKind())); | |||
384 | } | |||
385 | } | |||
386 | void VisitCapturedStmt(const CapturedStmt *S) { | |||
387 | if (!S) | |||
388 | return; | |||
389 | for (const CapturedStmt::Capture &C : S->captures()) { | |||
390 | if (C.capturesVariable() && !C.capturesVariableByCopy()) { | |||
391 | const ValueDecl *VD = C.getCapturedVar(); | |||
392 | markAsEscaped(VD); | |||
393 | if (isa<OMPCapturedExprDecl>(VD)) | |||
394 | VisitValueDecl(VD); | |||
395 | } | |||
396 | } | |||
397 | } | |||
398 | void VisitLambdaExpr(const LambdaExpr *E) { | |||
399 | if (!E) | |||
400 | return; | |||
401 | for (const LambdaCapture &C : E->captures()) { | |||
402 | if (C.capturesVariable()) { | |||
403 | if (C.getCaptureKind() == LCK_ByRef) { | |||
404 | const ValueDecl *VD = C.getCapturedVar(); | |||
405 | markAsEscaped(VD); | |||
406 | if (E->isInitCapture(&C) || isa<OMPCapturedExprDecl>(VD)) | |||
407 | VisitValueDecl(VD); | |||
408 | } | |||
409 | } | |||
410 | } | |||
411 | } | |||
412 | void VisitBlockExpr(const BlockExpr *E) { | |||
413 | if (!E) | |||
414 | return; | |||
415 | for (const BlockDecl::Capture &C : E->getBlockDecl()->captures()) { | |||
416 | if (C.isByRef()) { | |||
417 | const VarDecl *VD = C.getVariable(); | |||
418 | markAsEscaped(VD); | |||
419 | if (isa<OMPCapturedExprDecl>(VD) || VD->isInitCapture()) | |||
420 | VisitValueDecl(VD); | |||
421 | } | |||
422 | } | |||
423 | } | |||
424 | void VisitCallExpr(const CallExpr *E) { | |||
425 | if (!E) | |||
426 | return; | |||
427 | for (const Expr *Arg : E->arguments()) { | |||
428 | if (!Arg) | |||
429 | continue; | |||
430 | if (Arg->isLValue()) { | |||
431 | const bool SavedAllEscaped = AllEscaped; | |||
432 | AllEscaped = true; | |||
433 | Visit(Arg); | |||
434 | AllEscaped = SavedAllEscaped; | |||
435 | } else { | |||
436 | Visit(Arg); | |||
437 | } | |||
438 | } | |||
439 | Visit(E->getCallee()); | |||
440 | } | |||
441 | void VisitDeclRefExpr(const DeclRefExpr *E) { | |||
442 | if (!E) | |||
443 | return; | |||
444 | const ValueDecl *VD = E->getDecl(); | |||
445 | if (AllEscaped) | |||
446 | markAsEscaped(VD); | |||
447 | if (isa<OMPCapturedExprDecl>(VD)) | |||
448 | VisitValueDecl(VD); | |||
449 | else if (const auto *VarD = dyn_cast<VarDecl>(VD)) | |||
450 | if (VarD->isInitCapture()) | |||
451 | VisitValueDecl(VD); | |||
452 | } | |||
453 | void VisitUnaryOperator(const UnaryOperator *E) { | |||
454 | if (!E) | |||
455 | return; | |||
456 | if (E->getOpcode() == UO_AddrOf) { | |||
457 | const bool SavedAllEscaped = AllEscaped; | |||
458 | AllEscaped = true; | |||
459 | Visit(E->getSubExpr()); | |||
460 | AllEscaped = SavedAllEscaped; | |||
461 | } else { | |||
462 | Visit(E->getSubExpr()); | |||
463 | } | |||
464 | } | |||
465 | void VisitImplicitCastExpr(const ImplicitCastExpr *E) { | |||
466 | if (!E) | |||
467 | return; | |||
468 | if (E->getCastKind() == CK_ArrayToPointerDecay) { | |||
469 | const bool SavedAllEscaped = AllEscaped; | |||
470 | AllEscaped = true; | |||
471 | Visit(E->getSubExpr()); | |||
472 | AllEscaped = SavedAllEscaped; | |||
473 | } else { | |||
474 | Visit(E->getSubExpr()); | |||
475 | } | |||
476 | } | |||
477 | void VisitExpr(const Expr *E) { | |||
478 | if (!E) | |||
479 | return; | |||
480 | bool SavedAllEscaped = AllEscaped; | |||
481 | if (!E->isLValue()) | |||
482 | AllEscaped = false; | |||
483 | for (const Stmt *Child : E->children()) | |||
484 | if (Child) | |||
485 | Visit(Child); | |||
486 | AllEscaped = SavedAllEscaped; | |||
487 | } | |||
488 | void VisitStmt(const Stmt *S) { | |||
489 | if (!S) | |||
490 | return; | |||
491 | for (const Stmt *Child : S->children()) | |||
492 | if (Child) | |||
493 | Visit(Child); | |||
494 | } | |||
495 | ||||
496 | /// Returns the record that handles all the escaped local variables and used | |||
497 | /// instead of their original storage. | |||
498 | const RecordDecl *getGlobalizedRecord(bool IsInTTDRegion) { | |||
499 | if (!GlobalizedRD) | |||
500 | buildRecordForGlobalizedVars(IsInTTDRegion); | |||
501 | return GlobalizedRD; | |||
502 | } | |||
503 | ||||
504 | /// Returns the field in the globalized record for the escaped variable. | |||
505 | const FieldDecl *getFieldForGlobalizedVar(const ValueDecl *VD) const { | |||
506 | assert(GlobalizedRD &&(static_cast <bool> (GlobalizedRD && "Record for globalized variables must be generated already." ) ? void (0) : __assert_fail ("GlobalizedRD && \"Record for globalized variables must be generated already.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 507, __extension__ __PRETTY_FUNCTION__)) | |||
507 | "Record for globalized variables must be generated already.")(static_cast <bool> (GlobalizedRD && "Record for globalized variables must be generated already." ) ? void (0) : __assert_fail ("GlobalizedRD && \"Record for globalized variables must be generated already.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 507, __extension__ __PRETTY_FUNCTION__)); | |||
508 | auto I = MappedDeclsFields.find(VD); | |||
509 | if (I == MappedDeclsFields.end()) | |||
510 | return nullptr; | |||
511 | return I->getSecond(); | |||
512 | } | |||
513 | ||||
514 | /// Returns the list of the escaped local variables/parameters. | |||
515 | ArrayRef<const ValueDecl *> getEscapedDecls() const { | |||
516 | return EscapedDecls.getArrayRef(); | |||
517 | } | |||
518 | ||||
519 | /// Checks if the escaped local variable is actually a parameter passed by | |||
520 | /// value. | |||
521 | const llvm::SmallPtrSetImpl<const Decl *> &getEscapedParameters() const { | |||
522 | return EscapedParameters; | |||
523 | } | |||
524 | ||||
525 | /// Returns the list of the escaped variables with the variably modified | |||
526 | /// types. | |||
527 | ArrayRef<const ValueDecl *> getEscapedVariableLengthDecls() const { | |||
528 | return EscapedVariableLengthDecls.getArrayRef(); | |||
529 | } | |||
530 | }; | |||
531 | } // anonymous namespace | |||
532 | ||||
533 | /// Get the id of the warp in the block. | |||
534 | /// We assume that the warp size is 32, which is always the case | |||
535 | /// on the NVPTX device, to generate more efficient code. | |||
536 | static llvm::Value *getNVPTXWarpID(CodeGenFunction &CGF) { | |||
537 | CGBuilderTy &Bld = CGF.Builder; | |||
538 | unsigned LaneIDBits = | |||
539 | llvm::Log2_32(CGF.getTarget().getGridValue().GV_Warp_Size); | |||
540 | auto &RT = static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime()); | |||
541 | return Bld.CreateAShr(RT.getGPUThreadID(CGF), LaneIDBits, "nvptx_warp_id"); | |||
542 | } | |||
543 | ||||
544 | /// Get the id of the current lane in the Warp. | |||
545 | /// We assume that the warp size is 32, which is always the case | |||
546 | /// on the NVPTX device, to generate more efficient code. | |||
547 | static llvm::Value *getNVPTXLaneID(CodeGenFunction &CGF) { | |||
548 | CGBuilderTy &Bld = CGF.Builder; | |||
549 | unsigned LaneIDBits = | |||
550 | llvm::Log2_32(CGF.getTarget().getGridValue().GV_Warp_Size); | |||
551 | unsigned LaneIDMask = ~0u >> (32u - LaneIDBits); | |||
552 | auto &RT = static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime()); | |||
553 | return Bld.CreateAnd(RT.getGPUThreadID(CGF), Bld.getInt32(LaneIDMask), | |||
554 | "nvptx_lane_id"); | |||
555 | } | |||
556 | ||||
557 | CGOpenMPRuntimeGPU::ExecutionMode | |||
558 | CGOpenMPRuntimeGPU::getExecutionMode() const { | |||
559 | return CurrentExecutionMode; | |||
560 | } | |||
561 | ||||
562 | static CGOpenMPRuntimeGPU::DataSharingMode | |||
563 | getDataSharingMode(CodeGenModule &CGM) { | |||
564 | return CGM.getLangOpts().OpenMPCUDAMode ? CGOpenMPRuntimeGPU::CUDA | |||
565 | : CGOpenMPRuntimeGPU::Generic; | |||
566 | } | |||
567 | ||||
568 | /// Check for inner (nested) SPMD construct, if any | |||
569 | static bool hasNestedSPMDDirective(ASTContext &Ctx, | |||
570 | const OMPExecutableDirective &D) { | |||
571 | const auto *CS = D.getInnermostCapturedStmt(); | |||
572 | const auto *Body = | |||
573 | CS->getCapturedStmt()->IgnoreContainers(/*IgnoreCaptured=*/true); | |||
574 | const Stmt *ChildStmt = CGOpenMPRuntime::getSingleCompoundChild(Ctx, Body); | |||
575 | ||||
576 | if (const auto *NestedDir = | |||
577 | dyn_cast_or_null<OMPExecutableDirective>(ChildStmt)) { | |||
578 | OpenMPDirectiveKind DKind = NestedDir->getDirectiveKind(); | |||
579 | switch (D.getDirectiveKind()) { | |||
580 | case OMPD_target: | |||
581 | if (isOpenMPParallelDirective(DKind)) | |||
582 | return true; | |||
583 | if (DKind == OMPD_teams) { | |||
584 | Body = NestedDir->getInnermostCapturedStmt()->IgnoreContainers( | |||
585 | /*IgnoreCaptured=*/true); | |||
586 | if (!Body) | |||
587 | return false; | |||
588 | ChildStmt = CGOpenMPRuntime::getSingleCompoundChild(Ctx, Body); | |||
589 | if (const auto *NND = | |||
590 | dyn_cast_or_null<OMPExecutableDirective>(ChildStmt)) { | |||
591 | DKind = NND->getDirectiveKind(); | |||
592 | if (isOpenMPParallelDirective(DKind)) | |||
593 | return true; | |||
594 | } | |||
595 | } | |||
596 | return false; | |||
597 | case OMPD_target_teams: | |||
598 | return isOpenMPParallelDirective(DKind); | |||
599 | case OMPD_target_simd: | |||
600 | case OMPD_target_parallel: | |||
601 | case OMPD_target_parallel_for: | |||
602 | case OMPD_target_parallel_for_simd: | |||
603 | case OMPD_target_teams_distribute: | |||
604 | case OMPD_target_teams_distribute_simd: | |||
605 | case OMPD_target_teams_distribute_parallel_for: | |||
606 | case OMPD_target_teams_distribute_parallel_for_simd: | |||
607 | case OMPD_parallel: | |||
608 | case OMPD_for: | |||
609 | case OMPD_parallel_for: | |||
610 | case OMPD_parallel_master: | |||
611 | case OMPD_parallel_sections: | |||
612 | case OMPD_for_simd: | |||
613 | case OMPD_parallel_for_simd: | |||
614 | case OMPD_cancel: | |||
615 | case OMPD_cancellation_point: | |||
616 | case OMPD_ordered: | |||
617 | case OMPD_threadprivate: | |||
618 | case OMPD_allocate: | |||
619 | case OMPD_task: | |||
620 | case OMPD_simd: | |||
621 | case OMPD_sections: | |||
622 | case OMPD_section: | |||
623 | case OMPD_single: | |||
624 | case OMPD_master: | |||
625 | case OMPD_critical: | |||
626 | case OMPD_taskyield: | |||
627 | case OMPD_barrier: | |||
628 | case OMPD_taskwait: | |||
629 | case OMPD_taskgroup: | |||
630 | case OMPD_atomic: | |||
631 | case OMPD_flush: | |||
632 | case OMPD_depobj: | |||
633 | case OMPD_scan: | |||
634 | case OMPD_teams: | |||
635 | case OMPD_target_data: | |||
636 | case OMPD_target_exit_data: | |||
637 | case OMPD_target_enter_data: | |||
638 | case OMPD_distribute: | |||
639 | case OMPD_distribute_simd: | |||
640 | case OMPD_distribute_parallel_for: | |||
641 | case OMPD_distribute_parallel_for_simd: | |||
642 | case OMPD_teams_distribute: | |||
643 | case OMPD_teams_distribute_simd: | |||
644 | case OMPD_teams_distribute_parallel_for: | |||
645 | case OMPD_teams_distribute_parallel_for_simd: | |||
646 | case OMPD_target_update: | |||
647 | case OMPD_declare_simd: | |||
648 | case OMPD_declare_variant: | |||
649 | case OMPD_begin_declare_variant: | |||
650 | case OMPD_end_declare_variant: | |||
651 | case OMPD_declare_target: | |||
652 | case OMPD_end_declare_target: | |||
653 | case OMPD_declare_reduction: | |||
654 | case OMPD_declare_mapper: | |||
655 | case OMPD_taskloop: | |||
656 | case OMPD_taskloop_simd: | |||
657 | case OMPD_master_taskloop: | |||
658 | case OMPD_master_taskloop_simd: | |||
659 | case OMPD_parallel_master_taskloop: | |||
660 | case OMPD_parallel_master_taskloop_simd: | |||
661 | case OMPD_requires: | |||
662 | case OMPD_unknown: | |||
663 | default: | |||
664 | llvm_unreachable("Unexpected directive.")::llvm::llvm_unreachable_internal("Unexpected directive.", "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 664); | |||
665 | } | |||
666 | } | |||
667 | ||||
668 | return false; | |||
669 | } | |||
670 | ||||
671 | static bool supportsSPMDExecutionMode(ASTContext &Ctx, | |||
672 | const OMPExecutableDirective &D) { | |||
673 | OpenMPDirectiveKind DirectiveKind = D.getDirectiveKind(); | |||
674 | switch (DirectiveKind) { | |||
675 | case OMPD_target: | |||
676 | case OMPD_target_teams: | |||
677 | return hasNestedSPMDDirective(Ctx, D); | |||
678 | case OMPD_target_parallel: | |||
679 | case OMPD_target_parallel_for: | |||
680 | case OMPD_target_parallel_for_simd: | |||
681 | case OMPD_target_teams_distribute_parallel_for: | |||
682 | case OMPD_target_teams_distribute_parallel_for_simd: | |||
683 | case OMPD_target_simd: | |||
684 | case OMPD_target_teams_distribute_simd: | |||
685 | return true; | |||
686 | case OMPD_target_teams_distribute: | |||
687 | return false; | |||
688 | case OMPD_parallel: | |||
689 | case OMPD_for: | |||
690 | case OMPD_parallel_for: | |||
691 | case OMPD_parallel_master: | |||
692 | case OMPD_parallel_sections: | |||
693 | case OMPD_for_simd: | |||
694 | case OMPD_parallel_for_simd: | |||
695 | case OMPD_cancel: | |||
696 | case OMPD_cancellation_point: | |||
697 | case OMPD_ordered: | |||
698 | case OMPD_threadprivate: | |||
699 | case OMPD_allocate: | |||
700 | case OMPD_task: | |||
701 | case OMPD_simd: | |||
702 | case OMPD_sections: | |||
703 | case OMPD_section: | |||
704 | case OMPD_single: | |||
705 | case OMPD_master: | |||
706 | case OMPD_critical: | |||
707 | case OMPD_taskyield: | |||
708 | case OMPD_barrier: | |||
709 | case OMPD_taskwait: | |||
710 | case OMPD_taskgroup: | |||
711 | case OMPD_atomic: | |||
712 | case OMPD_flush: | |||
713 | case OMPD_depobj: | |||
714 | case OMPD_scan: | |||
715 | case OMPD_teams: | |||
716 | case OMPD_target_data: | |||
717 | case OMPD_target_exit_data: | |||
718 | case OMPD_target_enter_data: | |||
719 | case OMPD_distribute: | |||
720 | case OMPD_distribute_simd: | |||
721 | case OMPD_distribute_parallel_for: | |||
722 | case OMPD_distribute_parallel_for_simd: | |||
723 | case OMPD_teams_distribute: | |||
724 | case OMPD_teams_distribute_simd: | |||
725 | case OMPD_teams_distribute_parallel_for: | |||
726 | case OMPD_teams_distribute_parallel_for_simd: | |||
727 | case OMPD_target_update: | |||
728 | case OMPD_declare_simd: | |||
729 | case OMPD_declare_variant: | |||
730 | case OMPD_begin_declare_variant: | |||
731 | case OMPD_end_declare_variant: | |||
732 | case OMPD_declare_target: | |||
733 | case OMPD_end_declare_target: | |||
734 | case OMPD_declare_reduction: | |||
735 | case OMPD_declare_mapper: | |||
736 | case OMPD_taskloop: | |||
737 | case OMPD_taskloop_simd: | |||
738 | case OMPD_master_taskloop: | |||
739 | case OMPD_master_taskloop_simd: | |||
740 | case OMPD_parallel_master_taskloop: | |||
741 | case OMPD_parallel_master_taskloop_simd: | |||
742 | case OMPD_requires: | |||
743 | case OMPD_unknown: | |||
744 | default: | |||
745 | break; | |||
746 | } | |||
747 | llvm_unreachable(::llvm::llvm_unreachable_internal("Unknown programming model for OpenMP directive on NVPTX target." , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 748) | |||
748 | "Unknown programming model for OpenMP directive on NVPTX target.")::llvm::llvm_unreachable_internal("Unknown programming model for OpenMP directive on NVPTX target." , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 748); | |||
749 | } | |||
750 | ||||
751 | /// Check if the directive is loops based and has schedule clause at all or has | |||
752 | /// static scheduling. | |||
753 | static bool hasStaticScheduling(const OMPExecutableDirective &D) { | |||
754 | assert(isOpenMPWorksharingDirective(D.getDirectiveKind()) &&(static_cast <bool> (isOpenMPWorksharingDirective(D.getDirectiveKind ()) && isOpenMPLoopDirective(D.getDirectiveKind()) && "Expected loop-based directive.") ? void (0) : __assert_fail ("isOpenMPWorksharingDirective(D.getDirectiveKind()) && isOpenMPLoopDirective(D.getDirectiveKind()) && \"Expected loop-based directive.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 756, __extension__ __PRETTY_FUNCTION__)) | |||
755 | isOpenMPLoopDirective(D.getDirectiveKind()) &&(static_cast <bool> (isOpenMPWorksharingDirective(D.getDirectiveKind ()) && isOpenMPLoopDirective(D.getDirectiveKind()) && "Expected loop-based directive.") ? void (0) : __assert_fail ("isOpenMPWorksharingDirective(D.getDirectiveKind()) && isOpenMPLoopDirective(D.getDirectiveKind()) && \"Expected loop-based directive.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 756, __extension__ __PRETTY_FUNCTION__)) | |||
756 | "Expected loop-based directive.")(static_cast <bool> (isOpenMPWorksharingDirective(D.getDirectiveKind ()) && isOpenMPLoopDirective(D.getDirectiveKind()) && "Expected loop-based directive.") ? void (0) : __assert_fail ("isOpenMPWorksharingDirective(D.getDirectiveKind()) && isOpenMPLoopDirective(D.getDirectiveKind()) && \"Expected loop-based directive.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 756, __extension__ __PRETTY_FUNCTION__)); | |||
757 | return !D.hasClausesOfKind<OMPOrderedClause>() && | |||
758 | (!D.hasClausesOfKind<OMPScheduleClause>() || | |||
759 | llvm::any_of(D.getClausesOfKind<OMPScheduleClause>(), | |||
760 | [](const OMPScheduleClause *C) { | |||
761 | return C->getScheduleKind() == OMPC_SCHEDULE_static; | |||
762 | })); | |||
763 | } | |||
764 | ||||
765 | /// Check for inner (nested) lightweight runtime construct, if any | |||
766 | static bool hasNestedLightweightDirective(ASTContext &Ctx, | |||
767 | const OMPExecutableDirective &D) { | |||
768 | assert(supportsSPMDExecutionMode(Ctx, D) && "Expected SPMD mode directive.")(static_cast <bool> (supportsSPMDExecutionMode(Ctx, D) && "Expected SPMD mode directive.") ? void (0) : __assert_fail ( "supportsSPMDExecutionMode(Ctx, D) && \"Expected SPMD mode directive.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 768, __extension__ __PRETTY_FUNCTION__)); | |||
769 | const auto *CS = D.getInnermostCapturedStmt(); | |||
770 | const auto *Body = | |||
771 | CS->getCapturedStmt()->IgnoreContainers(/*IgnoreCaptured=*/true); | |||
772 | const Stmt *ChildStmt = CGOpenMPRuntime::getSingleCompoundChild(Ctx, Body); | |||
773 | ||||
774 | if (const auto *NestedDir = | |||
775 | dyn_cast_or_null<OMPExecutableDirective>(ChildStmt)) { | |||
776 | OpenMPDirectiveKind DKind = NestedDir->getDirectiveKind(); | |||
777 | switch (D.getDirectiveKind()) { | |||
778 | case OMPD_target: | |||
779 | if (isOpenMPParallelDirective(DKind) && | |||
780 | isOpenMPWorksharingDirective(DKind) && isOpenMPLoopDirective(DKind) && | |||
781 | hasStaticScheduling(*NestedDir)) | |||
782 | return true; | |||
783 | if (DKind == OMPD_teams_distribute_simd || DKind == OMPD_simd) | |||
784 | return true; | |||
785 | if (DKind == OMPD_parallel) { | |||
786 | Body = NestedDir->getInnermostCapturedStmt()->IgnoreContainers( | |||
787 | /*IgnoreCaptured=*/true); | |||
788 | if (!Body) | |||
789 | return false; | |||
790 | ChildStmt = CGOpenMPRuntime::getSingleCompoundChild(Ctx, Body); | |||
791 | if (const auto *NND = | |||
792 | dyn_cast_or_null<OMPExecutableDirective>(ChildStmt)) { | |||
793 | DKind = NND->getDirectiveKind(); | |||
794 | if (isOpenMPWorksharingDirective(DKind) && | |||
795 | isOpenMPLoopDirective(DKind) && hasStaticScheduling(*NND)) | |||
796 | return true; | |||
797 | } | |||
798 | } else if (DKind == OMPD_teams) { | |||
799 | Body = NestedDir->getInnermostCapturedStmt()->IgnoreContainers( | |||
800 | /*IgnoreCaptured=*/true); | |||
801 | if (!Body) | |||
802 | return false; | |||
803 | ChildStmt = CGOpenMPRuntime::getSingleCompoundChild(Ctx, Body); | |||
804 | if (const auto *NND = | |||
805 | dyn_cast_or_null<OMPExecutableDirective>(ChildStmt)) { | |||
806 | DKind = NND->getDirectiveKind(); | |||
807 | if (isOpenMPParallelDirective(DKind) && | |||
808 | isOpenMPWorksharingDirective(DKind) && | |||
809 | isOpenMPLoopDirective(DKind) && hasStaticScheduling(*NND)) | |||
810 | return true; | |||
811 | if (DKind == OMPD_parallel) { | |||
812 | Body = NND->getInnermostCapturedStmt()->IgnoreContainers( | |||
813 | /*IgnoreCaptured=*/true); | |||
814 | if (!Body) | |||
815 | return false; | |||
816 | ChildStmt = CGOpenMPRuntime::getSingleCompoundChild(Ctx, Body); | |||
817 | if (const auto *NND = | |||
818 | dyn_cast_or_null<OMPExecutableDirective>(ChildStmt)) { | |||
819 | DKind = NND->getDirectiveKind(); | |||
820 | if (isOpenMPWorksharingDirective(DKind) && | |||
821 | isOpenMPLoopDirective(DKind) && hasStaticScheduling(*NND)) | |||
822 | return true; | |||
823 | } | |||
824 | } | |||
825 | } | |||
826 | } | |||
827 | return false; | |||
828 | case OMPD_target_teams: | |||
829 | if (isOpenMPParallelDirective(DKind) && | |||
830 | isOpenMPWorksharingDirective(DKind) && isOpenMPLoopDirective(DKind) && | |||
831 | hasStaticScheduling(*NestedDir)) | |||
832 | return true; | |||
833 | if (DKind == OMPD_distribute_simd || DKind == OMPD_simd) | |||
834 | return true; | |||
835 | if (DKind == OMPD_parallel) { | |||
836 | Body = NestedDir->getInnermostCapturedStmt()->IgnoreContainers( | |||
837 | /*IgnoreCaptured=*/true); | |||
838 | if (!Body) | |||
839 | return false; | |||
840 | ChildStmt = CGOpenMPRuntime::getSingleCompoundChild(Ctx, Body); | |||
841 | if (const auto *NND = | |||
842 | dyn_cast_or_null<OMPExecutableDirective>(ChildStmt)) { | |||
843 | DKind = NND->getDirectiveKind(); | |||
844 | if (isOpenMPWorksharingDirective(DKind) && | |||
845 | isOpenMPLoopDirective(DKind) && hasStaticScheduling(*NND)) | |||
846 | return true; | |||
847 | } | |||
848 | } | |||
849 | return false; | |||
850 | case OMPD_target_parallel: | |||
851 | if (DKind == OMPD_simd) | |||
852 | return true; | |||
853 | return isOpenMPWorksharingDirective(DKind) && | |||
854 | isOpenMPLoopDirective(DKind) && hasStaticScheduling(*NestedDir); | |||
855 | case OMPD_target_teams_distribute: | |||
856 | case OMPD_target_simd: | |||
857 | case OMPD_target_parallel_for: | |||
858 | case OMPD_target_parallel_for_simd: | |||
859 | case OMPD_target_teams_distribute_simd: | |||
860 | case OMPD_target_teams_distribute_parallel_for: | |||
861 | case OMPD_target_teams_distribute_parallel_for_simd: | |||
862 | case OMPD_parallel: | |||
863 | case OMPD_for: | |||
864 | case OMPD_parallel_for: | |||
865 | case OMPD_parallel_master: | |||
866 | case OMPD_parallel_sections: | |||
867 | case OMPD_for_simd: | |||
868 | case OMPD_parallel_for_simd: | |||
869 | case OMPD_cancel: | |||
870 | case OMPD_cancellation_point: | |||
871 | case OMPD_ordered: | |||
872 | case OMPD_threadprivate: | |||
873 | case OMPD_allocate: | |||
874 | case OMPD_task: | |||
875 | case OMPD_simd: | |||
876 | case OMPD_sections: | |||
877 | case OMPD_section: | |||
878 | case OMPD_single: | |||
879 | case OMPD_master: | |||
880 | case OMPD_critical: | |||
881 | case OMPD_taskyield: | |||
882 | case OMPD_barrier: | |||
883 | case OMPD_taskwait: | |||
884 | case OMPD_taskgroup: | |||
885 | case OMPD_atomic: | |||
886 | case OMPD_flush: | |||
887 | case OMPD_depobj: | |||
888 | case OMPD_scan: | |||
889 | case OMPD_teams: | |||
890 | case OMPD_target_data: | |||
891 | case OMPD_target_exit_data: | |||
892 | case OMPD_target_enter_data: | |||
893 | case OMPD_distribute: | |||
894 | case OMPD_distribute_simd: | |||
895 | case OMPD_distribute_parallel_for: | |||
896 | case OMPD_distribute_parallel_for_simd: | |||
897 | case OMPD_teams_distribute: | |||
898 | case OMPD_teams_distribute_simd: | |||
899 | case OMPD_teams_distribute_parallel_for: | |||
900 | case OMPD_teams_distribute_parallel_for_simd: | |||
901 | case OMPD_target_update: | |||
902 | case OMPD_declare_simd: | |||
903 | case OMPD_declare_variant: | |||
904 | case OMPD_begin_declare_variant: | |||
905 | case OMPD_end_declare_variant: | |||
906 | case OMPD_declare_target: | |||
907 | case OMPD_end_declare_target: | |||
908 | case OMPD_declare_reduction: | |||
909 | case OMPD_declare_mapper: | |||
910 | case OMPD_taskloop: | |||
911 | case OMPD_taskloop_simd: | |||
912 | case OMPD_master_taskloop: | |||
913 | case OMPD_master_taskloop_simd: | |||
914 | case OMPD_parallel_master_taskloop: | |||
915 | case OMPD_parallel_master_taskloop_simd: | |||
916 | case OMPD_requires: | |||
917 | case OMPD_unknown: | |||
918 | default: | |||
919 | llvm_unreachable("Unexpected directive.")::llvm::llvm_unreachable_internal("Unexpected directive.", "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 919); | |||
920 | } | |||
921 | } | |||
922 | ||||
923 | return false; | |||
924 | } | |||
925 | ||||
926 | /// Checks if the construct supports lightweight runtime. It must be SPMD | |||
927 | /// construct + inner loop-based construct with static scheduling. | |||
928 | static bool supportsLightweightRuntime(ASTContext &Ctx, | |||
929 | const OMPExecutableDirective &D) { | |||
930 | if (!supportsSPMDExecutionMode(Ctx, D)) | |||
931 | return false; | |||
932 | OpenMPDirectiveKind DirectiveKind = D.getDirectiveKind(); | |||
933 | switch (DirectiveKind) { | |||
934 | case OMPD_target: | |||
935 | case OMPD_target_teams: | |||
936 | case OMPD_target_parallel: | |||
937 | return hasNestedLightweightDirective(Ctx, D); | |||
938 | case OMPD_target_parallel_for: | |||
939 | case OMPD_target_parallel_for_simd: | |||
940 | case OMPD_target_teams_distribute_parallel_for: | |||
941 | case OMPD_target_teams_distribute_parallel_for_simd: | |||
942 | // (Last|First)-privates must be shared in parallel region. | |||
943 | return hasStaticScheduling(D); | |||
944 | case OMPD_target_simd: | |||
945 | case OMPD_target_teams_distribute_simd: | |||
946 | return true; | |||
947 | case OMPD_target_teams_distribute: | |||
948 | return false; | |||
949 | case OMPD_parallel: | |||
950 | case OMPD_for: | |||
951 | case OMPD_parallel_for: | |||
952 | case OMPD_parallel_master: | |||
953 | case OMPD_parallel_sections: | |||
954 | case OMPD_for_simd: | |||
955 | case OMPD_parallel_for_simd: | |||
956 | case OMPD_cancel: | |||
957 | case OMPD_cancellation_point: | |||
958 | case OMPD_ordered: | |||
959 | case OMPD_threadprivate: | |||
960 | case OMPD_allocate: | |||
961 | case OMPD_task: | |||
962 | case OMPD_simd: | |||
963 | case OMPD_sections: | |||
964 | case OMPD_section: | |||
965 | case OMPD_single: | |||
966 | case OMPD_master: | |||
967 | case OMPD_critical: | |||
968 | case OMPD_taskyield: | |||
969 | case OMPD_barrier: | |||
970 | case OMPD_taskwait: | |||
971 | case OMPD_taskgroup: | |||
972 | case OMPD_atomic: | |||
973 | case OMPD_flush: | |||
974 | case OMPD_depobj: | |||
975 | case OMPD_scan: | |||
976 | case OMPD_teams: | |||
977 | case OMPD_target_data: | |||
978 | case OMPD_target_exit_data: | |||
979 | case OMPD_target_enter_data: | |||
980 | case OMPD_distribute: | |||
981 | case OMPD_distribute_simd: | |||
982 | case OMPD_distribute_parallel_for: | |||
983 | case OMPD_distribute_parallel_for_simd: | |||
984 | case OMPD_teams_distribute: | |||
985 | case OMPD_teams_distribute_simd: | |||
986 | case OMPD_teams_distribute_parallel_for: | |||
987 | case OMPD_teams_distribute_parallel_for_simd: | |||
988 | case OMPD_target_update: | |||
989 | case OMPD_declare_simd: | |||
990 | case OMPD_declare_variant: | |||
991 | case OMPD_begin_declare_variant: | |||
992 | case OMPD_end_declare_variant: | |||
993 | case OMPD_declare_target: | |||
994 | case OMPD_end_declare_target: | |||
995 | case OMPD_declare_reduction: | |||
996 | case OMPD_declare_mapper: | |||
997 | case OMPD_taskloop: | |||
998 | case OMPD_taskloop_simd: | |||
999 | case OMPD_master_taskloop: | |||
1000 | case OMPD_master_taskloop_simd: | |||
1001 | case OMPD_parallel_master_taskloop: | |||
1002 | case OMPD_parallel_master_taskloop_simd: | |||
1003 | case OMPD_requires: | |||
1004 | case OMPD_unknown: | |||
1005 | default: | |||
1006 | break; | |||
1007 | } | |||
1008 | llvm_unreachable(::llvm::llvm_unreachable_internal("Unknown programming model for OpenMP directive on NVPTX target." , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 1009) | |||
1009 | "Unknown programming model for OpenMP directive on NVPTX target.")::llvm::llvm_unreachable_internal("Unknown programming model for OpenMP directive on NVPTX target." , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 1009); | |||
1010 | } | |||
1011 | ||||
1012 | void CGOpenMPRuntimeGPU::emitNonSPMDKernel(const OMPExecutableDirective &D, | |||
1013 | StringRef ParentName, | |||
1014 | llvm::Function *&OutlinedFn, | |||
1015 | llvm::Constant *&OutlinedFnID, | |||
1016 | bool IsOffloadEntry, | |||
1017 | const RegionCodeGenTy &CodeGen) { | |||
1018 | ExecutionRuntimeModesRAII ModeRAII(CurrentExecutionMode); | |||
1019 | EntryFunctionState EST; | |||
1020 | WrapperFunctionsMap.clear(); | |||
1021 | ||||
1022 | // Emit target region as a standalone region. | |||
1023 | class NVPTXPrePostActionTy : public PrePostActionTy { | |||
1024 | CGOpenMPRuntimeGPU::EntryFunctionState &EST; | |||
1025 | ||||
1026 | public: | |||
1027 | NVPTXPrePostActionTy(CGOpenMPRuntimeGPU::EntryFunctionState &EST) | |||
1028 | : EST(EST) {} | |||
1029 | void Enter(CodeGenFunction &CGF) override { | |||
1030 | auto &RT = | |||
1031 | static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime()); | |||
1032 | RT.emitKernelInit(CGF, EST, /* IsSPMD */ false); | |||
1033 | // Skip target region initialization. | |||
1034 | RT.setLocThreadIdInsertPt(CGF, /*AtCurrentPoint=*/true); | |||
1035 | } | |||
1036 | void Exit(CodeGenFunction &CGF) override { | |||
1037 | auto &RT = | |||
1038 | static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime()); | |||
1039 | RT.clearLocThreadIdInsertPt(CGF); | |||
1040 | RT.emitKernelDeinit(CGF, EST, /* IsSPMD */ false); | |||
1041 | } | |||
1042 | } Action(EST); | |||
1043 | CodeGen.setAction(Action); | |||
1044 | IsInTTDRegion = true; | |||
1045 | emitTargetOutlinedFunctionHelper(D, ParentName, OutlinedFn, OutlinedFnID, | |||
1046 | IsOffloadEntry, CodeGen); | |||
1047 | IsInTTDRegion = false; | |||
1048 | } | |||
1049 | ||||
1050 | void CGOpenMPRuntimeGPU::emitKernelInit(CodeGenFunction &CGF, | |||
1051 | EntryFunctionState &EST, bool IsSPMD) { | |||
1052 | CGBuilderTy &Bld = CGF.Builder; | |||
1053 | Bld.restoreIP(OMPBuilder.createTargetInit(Bld, IsSPMD, requiresFullRuntime())); | |||
1054 | IsInTargetMasterThreadRegion = IsSPMD; | |||
1055 | if (!IsSPMD) | |||
1056 | emitGenericVarsProlog(CGF, EST.Loc); | |||
1057 | } | |||
1058 | ||||
1059 | void CGOpenMPRuntimeGPU::emitKernelDeinit(CodeGenFunction &CGF, | |||
1060 | EntryFunctionState &EST, | |||
1061 | bool IsSPMD) { | |||
1062 | if (!IsSPMD) | |||
1063 | emitGenericVarsEpilog(CGF); | |||
1064 | ||||
1065 | CGBuilderTy &Bld = CGF.Builder; | |||
1066 | OMPBuilder.createTargetDeinit(Bld, IsSPMD, requiresFullRuntime()); | |||
1067 | } | |||
1068 | ||||
1069 | void CGOpenMPRuntimeGPU::emitSPMDKernel(const OMPExecutableDirective &D, | |||
1070 | StringRef ParentName, | |||
1071 | llvm::Function *&OutlinedFn, | |||
1072 | llvm::Constant *&OutlinedFnID, | |||
1073 | bool IsOffloadEntry, | |||
1074 | const RegionCodeGenTy &CodeGen) { | |||
1075 | ExecutionRuntimeModesRAII ModeRAII( | |||
1076 | CurrentExecutionMode, RequiresFullRuntime, | |||
1077 | CGM.getLangOpts().OpenMPCUDAForceFullRuntime || | |||
1078 | !supportsLightweightRuntime(CGM.getContext(), D)); | |||
1079 | EntryFunctionState EST; | |||
1080 | ||||
1081 | // Emit target region as a standalone region. | |||
1082 | class NVPTXPrePostActionTy : public PrePostActionTy { | |||
1083 | CGOpenMPRuntimeGPU &RT; | |||
1084 | CGOpenMPRuntimeGPU::EntryFunctionState &EST; | |||
1085 | ||||
1086 | public: | |||
1087 | NVPTXPrePostActionTy(CGOpenMPRuntimeGPU &RT, | |||
1088 | CGOpenMPRuntimeGPU::EntryFunctionState &EST) | |||
1089 | : RT(RT), EST(EST) {} | |||
1090 | void Enter(CodeGenFunction &CGF) override { | |||
1091 | RT.emitKernelInit(CGF, EST, /* IsSPMD */ true); | |||
1092 | // Skip target region initialization. | |||
1093 | RT.setLocThreadIdInsertPt(CGF, /*AtCurrentPoint=*/true); | |||
1094 | } | |||
1095 | void Exit(CodeGenFunction &CGF) override { | |||
1096 | RT.clearLocThreadIdInsertPt(CGF); | |||
1097 | RT.emitKernelDeinit(CGF, EST, /* IsSPMD */ true); | |||
1098 | } | |||
1099 | } Action(*this, EST); | |||
1100 | CodeGen.setAction(Action); | |||
1101 | IsInTTDRegion = true; | |||
1102 | emitTargetOutlinedFunctionHelper(D, ParentName, OutlinedFn, OutlinedFnID, | |||
1103 | IsOffloadEntry, CodeGen); | |||
1104 | IsInTTDRegion = false; | |||
1105 | } | |||
1106 | ||||
1107 | // Create a unique global variable to indicate the execution mode of this target | |||
1108 | // region. The execution mode is either 'generic', or 'spmd' depending on the | |||
1109 | // target directive. This variable is picked up by the offload library to setup | |||
1110 | // the device appropriately before kernel launch. If the execution mode is | |||
1111 | // 'generic', the runtime reserves one warp for the master, otherwise, all | |||
1112 | // warps participate in parallel work. | |||
1113 | static void setPropertyExecutionMode(CodeGenModule &CGM, StringRef Name, | |||
1114 | bool Mode) { | |||
1115 | auto *GVMode = | |||
1116 | new llvm::GlobalVariable(CGM.getModule(), CGM.Int8Ty, /*isConstant=*/true, | |||
1117 | llvm::GlobalValue::WeakAnyLinkage, | |||
1118 | llvm::ConstantInt::get(CGM.Int8Ty, Mode ? 0 : 1), | |||
1119 | Twine(Name, "_exec_mode")); | |||
1120 | CGM.addCompilerUsedGlobal(GVMode); | |||
1121 | } | |||
1122 | ||||
1123 | void CGOpenMPRuntimeGPU::createOffloadEntry(llvm::Constant *ID, | |||
1124 | llvm::Constant *Addr, | |||
1125 | uint64_t Size, int32_t, | |||
1126 | llvm::GlobalValue::LinkageTypes) { | |||
1127 | // TODO: Add support for global variables on the device after declare target | |||
1128 | // support. | |||
1129 | if (!isa<llvm::Function>(Addr)) | |||
1130 | return; | |||
1131 | llvm::Module &M = CGM.getModule(); | |||
1132 | llvm::LLVMContext &Ctx = CGM.getLLVMContext(); | |||
1133 | ||||
1134 | // Get "nvvm.annotations" metadata node | |||
1135 | llvm::NamedMDNode *MD = M.getOrInsertNamedMetadata("nvvm.annotations"); | |||
1136 | ||||
1137 | llvm::Metadata *MDVals[] = { | |||
1138 | llvm::ConstantAsMetadata::get(Addr), llvm::MDString::get(Ctx, "kernel"), | |||
1139 | llvm::ConstantAsMetadata::get( | |||
1140 | llvm::ConstantInt::get(llvm::Type::getInt32Ty(Ctx), 1))}; | |||
1141 | // Append metadata to nvvm.annotations | |||
1142 | MD->addOperand(llvm::MDNode::get(Ctx, MDVals)); | |||
1143 | } | |||
1144 | ||||
1145 | void CGOpenMPRuntimeGPU::emitTargetOutlinedFunction( | |||
1146 | const OMPExecutableDirective &D, StringRef ParentName, | |||
1147 | llvm::Function *&OutlinedFn, llvm::Constant *&OutlinedFnID, | |||
1148 | bool IsOffloadEntry, const RegionCodeGenTy &CodeGen) { | |||
1149 | if (!IsOffloadEntry) // Nothing to do. | |||
1150 | return; | |||
1151 | ||||
1152 | assert(!ParentName.empty() && "Invalid target region parent name!")(static_cast <bool> (!ParentName.empty() && "Invalid target region parent name!" ) ? void (0) : __assert_fail ("!ParentName.empty() && \"Invalid target region parent name!\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 1152, __extension__ __PRETTY_FUNCTION__)); | |||
1153 | ||||
1154 | bool Mode = supportsSPMDExecutionMode(CGM.getContext(), D); | |||
1155 | if (Mode) | |||
1156 | emitSPMDKernel(D, ParentName, OutlinedFn, OutlinedFnID, IsOffloadEntry, | |||
1157 | CodeGen); | |||
1158 | else | |||
1159 | emitNonSPMDKernel(D, ParentName, OutlinedFn, OutlinedFnID, IsOffloadEntry, | |||
1160 | CodeGen); | |||
1161 | ||||
1162 | setPropertyExecutionMode(CGM, OutlinedFn->getName(), Mode); | |||
1163 | } | |||
1164 | ||||
1165 | namespace { | |||
1166 | LLVM_ENABLE_BITMASK_ENUMS_IN_NAMESPACE()using ::llvm::BitmaskEnumDetail::operator~; using ::llvm::BitmaskEnumDetail ::operator|; using ::llvm::BitmaskEnumDetail::operator&; using ::llvm::BitmaskEnumDetail::operator^; using ::llvm::BitmaskEnumDetail ::operator|=; using ::llvm::BitmaskEnumDetail::operator&= ; using ::llvm::BitmaskEnumDetail::operator^=; | |||
1167 | /// Enum for accesseing the reserved_2 field of the ident_t struct. | |||
1168 | enum ModeFlagsTy : unsigned { | |||
1169 | /// Bit set to 1 when in SPMD mode. | |||
1170 | KMP_IDENT_SPMD_MODE = 0x01, | |||
1171 | /// Bit set to 1 when a simplified runtime is used. | |||
1172 | KMP_IDENT_SIMPLE_RT_MODE = 0x02, | |||
1173 | LLVM_MARK_AS_BITMASK_ENUM(/*LargestValue=*/KMP_IDENT_SIMPLE_RT_MODE)LLVM_BITMASK_LARGEST_ENUMERATOR = KMP_IDENT_SIMPLE_RT_MODE | |||
1174 | }; | |||
1175 | ||||
1176 | /// Special mode Undefined. Is the combination of Non-SPMD mode + SimpleRuntime. | |||
1177 | static const ModeFlagsTy UndefinedMode = | |||
1178 | (~KMP_IDENT_SPMD_MODE) & KMP_IDENT_SIMPLE_RT_MODE; | |||
1179 | } // anonymous namespace | |||
1180 | ||||
1181 | unsigned CGOpenMPRuntimeGPU::getDefaultLocationReserved2Flags() const { | |||
1182 | switch (getExecutionMode()) { | |||
1183 | case EM_SPMD: | |||
1184 | if (requiresFullRuntime()) | |||
1185 | return KMP_IDENT_SPMD_MODE & (~KMP_IDENT_SIMPLE_RT_MODE); | |||
1186 | return KMP_IDENT_SPMD_MODE | KMP_IDENT_SIMPLE_RT_MODE; | |||
1187 | case EM_NonSPMD: | |||
1188 | assert(requiresFullRuntime() && "Expected full runtime.")(static_cast <bool> (requiresFullRuntime() && "Expected full runtime." ) ? void (0) : __assert_fail ("requiresFullRuntime() && \"Expected full runtime.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 1188, __extension__ __PRETTY_FUNCTION__)); | |||
1189 | return (~KMP_IDENT_SPMD_MODE) & (~KMP_IDENT_SIMPLE_RT_MODE); | |||
1190 | case EM_Unknown: | |||
1191 | return UndefinedMode; | |||
1192 | } | |||
1193 | llvm_unreachable("Unknown flags are requested.")::llvm::llvm_unreachable_internal("Unknown flags are requested." , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 1193); | |||
1194 | } | |||
1195 | ||||
1196 | CGOpenMPRuntimeGPU::CGOpenMPRuntimeGPU(CodeGenModule &CGM) | |||
1197 | : CGOpenMPRuntime(CGM, "_", "$") { | |||
1198 | if (!CGM.getLangOpts().OpenMPIsDevice) | |||
1199 | llvm_unreachable("OpenMP NVPTX can only handle device code.")::llvm::llvm_unreachable_internal("OpenMP NVPTX can only handle device code." , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 1199); | |||
1200 | } | |||
1201 | ||||
1202 | void CGOpenMPRuntimeGPU::emitProcBindClause(CodeGenFunction &CGF, | |||
1203 | ProcBindKind ProcBind, | |||
1204 | SourceLocation Loc) { | |||
1205 | // Do nothing in case of SPMD mode and L0 parallel. | |||
1206 | if (getExecutionMode() == CGOpenMPRuntimeGPU::EM_SPMD) | |||
1207 | return; | |||
1208 | ||||
1209 | CGOpenMPRuntime::emitProcBindClause(CGF, ProcBind, Loc); | |||
1210 | } | |||
1211 | ||||
1212 | void CGOpenMPRuntimeGPU::emitNumThreadsClause(CodeGenFunction &CGF, | |||
1213 | llvm::Value *NumThreads, | |||
1214 | SourceLocation Loc) { | |||
1215 | // Do nothing in case of SPMD mode and L0 parallel. | |||
1216 | if (getExecutionMode() == CGOpenMPRuntimeGPU::EM_SPMD) | |||
1217 | return; | |||
1218 | ||||
1219 | CGOpenMPRuntime::emitNumThreadsClause(CGF, NumThreads, Loc); | |||
1220 | } | |||
1221 | ||||
1222 | void CGOpenMPRuntimeGPU::emitNumTeamsClause(CodeGenFunction &CGF, | |||
1223 | const Expr *NumTeams, | |||
1224 | const Expr *ThreadLimit, | |||
1225 | SourceLocation Loc) {} | |||
1226 | ||||
1227 | llvm::Function *CGOpenMPRuntimeGPU::emitParallelOutlinedFunction( | |||
1228 | const OMPExecutableDirective &D, const VarDecl *ThreadIDVar, | |||
1229 | OpenMPDirectiveKind InnermostKind, const RegionCodeGenTy &CodeGen) { | |||
1230 | // Emit target region as a standalone region. | |||
1231 | class NVPTXPrePostActionTy : public PrePostActionTy { | |||
1232 | bool &IsInParallelRegion; | |||
1233 | bool PrevIsInParallelRegion; | |||
1234 | ||||
1235 | public: | |||
1236 | NVPTXPrePostActionTy(bool &IsInParallelRegion) | |||
1237 | : IsInParallelRegion(IsInParallelRegion) {} | |||
1238 | void Enter(CodeGenFunction &CGF) override { | |||
1239 | PrevIsInParallelRegion = IsInParallelRegion; | |||
1240 | IsInParallelRegion = true; | |||
1241 | } | |||
1242 | void Exit(CodeGenFunction &CGF) override { | |||
1243 | IsInParallelRegion = PrevIsInParallelRegion; | |||
1244 | } | |||
1245 | } Action(IsInParallelRegion); | |||
1246 | CodeGen.setAction(Action); | |||
1247 | bool PrevIsInTTDRegion = IsInTTDRegion; | |||
1248 | IsInTTDRegion = false; | |||
1249 | bool PrevIsInTargetMasterThreadRegion = IsInTargetMasterThreadRegion; | |||
1250 | IsInTargetMasterThreadRegion = false; | |||
1251 | auto *OutlinedFun = | |||
1252 | cast<llvm::Function>(CGOpenMPRuntime::emitParallelOutlinedFunction( | |||
1253 | D, ThreadIDVar, InnermostKind, CodeGen)); | |||
1254 | IsInTargetMasterThreadRegion = PrevIsInTargetMasterThreadRegion; | |||
1255 | IsInTTDRegion = PrevIsInTTDRegion; | |||
1256 | if (getExecutionMode() != CGOpenMPRuntimeGPU::EM_SPMD && | |||
1257 | !IsInParallelRegion) { | |||
1258 | llvm::Function *WrapperFun = | |||
1259 | createParallelDataSharingWrapper(OutlinedFun, D); | |||
1260 | WrapperFunctionsMap[OutlinedFun] = WrapperFun; | |||
1261 | } | |||
1262 | ||||
1263 | return OutlinedFun; | |||
1264 | } | |||
1265 | ||||
1266 | /// Get list of lastprivate variables from the teams distribute ... or | |||
1267 | /// teams {distribute ...} directives. | |||
1268 | static void | |||
1269 | getDistributeLastprivateVars(ASTContext &Ctx, const OMPExecutableDirective &D, | |||
1270 | llvm::SmallVectorImpl<const ValueDecl *> &Vars) { | |||
1271 | assert(isOpenMPTeamsDirective(D.getDirectiveKind()) &&(static_cast <bool> (isOpenMPTeamsDirective(D.getDirectiveKind ()) && "expected teams directive.") ? void (0) : __assert_fail ("isOpenMPTeamsDirective(D.getDirectiveKind()) && \"expected teams directive.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 1272, __extension__ __PRETTY_FUNCTION__)) | |||
1272 | "expected teams directive.")(static_cast <bool> (isOpenMPTeamsDirective(D.getDirectiveKind ()) && "expected teams directive.") ? void (0) : __assert_fail ("isOpenMPTeamsDirective(D.getDirectiveKind()) && \"expected teams directive.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 1272, __extension__ __PRETTY_FUNCTION__)); | |||
1273 | const OMPExecutableDirective *Dir = &D; | |||
1274 | if (!isOpenMPDistributeDirective(D.getDirectiveKind())) { | |||
1275 | if (const Stmt *S = CGOpenMPRuntime::getSingleCompoundChild( | |||
1276 | Ctx, | |||
1277 | D.getInnermostCapturedStmt()->getCapturedStmt()->IgnoreContainers( | |||
1278 | /*IgnoreCaptured=*/true))) { | |||
1279 | Dir = dyn_cast_or_null<OMPExecutableDirective>(S); | |||
1280 | if (Dir && !isOpenMPDistributeDirective(Dir->getDirectiveKind())) | |||
1281 | Dir = nullptr; | |||
1282 | } | |||
1283 | } | |||
1284 | if (!Dir) | |||
1285 | return; | |||
1286 | for (const auto *C : Dir->getClausesOfKind<OMPLastprivateClause>()) { | |||
1287 | for (const Expr *E : C->getVarRefs()) | |||
1288 | Vars.push_back(getPrivateItem(E)); | |||
1289 | } | |||
1290 | } | |||
1291 | ||||
1292 | /// Get list of reduction variables from the teams ... directives. | |||
1293 | static void | |||
1294 | getTeamsReductionVars(ASTContext &Ctx, const OMPExecutableDirective &D, | |||
1295 | llvm::SmallVectorImpl<const ValueDecl *> &Vars) { | |||
1296 | assert(isOpenMPTeamsDirective(D.getDirectiveKind()) &&(static_cast <bool> (isOpenMPTeamsDirective(D.getDirectiveKind ()) && "expected teams directive.") ? void (0) : __assert_fail ("isOpenMPTeamsDirective(D.getDirectiveKind()) && \"expected teams directive.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 1297, __extension__ __PRETTY_FUNCTION__)) | |||
1297 | "expected teams directive.")(static_cast <bool> (isOpenMPTeamsDirective(D.getDirectiveKind ()) && "expected teams directive.") ? void (0) : __assert_fail ("isOpenMPTeamsDirective(D.getDirectiveKind()) && \"expected teams directive.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 1297, __extension__ __PRETTY_FUNCTION__)); | |||
1298 | for (const auto *C : D.getClausesOfKind<OMPReductionClause>()) { | |||
1299 | for (const Expr *E : C->privates()) | |||
1300 | Vars.push_back(getPrivateItem(E)); | |||
1301 | } | |||
1302 | } | |||
1303 | ||||
1304 | llvm::Function *CGOpenMPRuntimeGPU::emitTeamsOutlinedFunction( | |||
1305 | const OMPExecutableDirective &D, const VarDecl *ThreadIDVar, | |||
1306 | OpenMPDirectiveKind InnermostKind, const RegionCodeGenTy &CodeGen) { | |||
1307 | SourceLocation Loc = D.getBeginLoc(); | |||
1308 | ||||
1309 | const RecordDecl *GlobalizedRD = nullptr; | |||
1310 | llvm::SmallVector<const ValueDecl *, 4> LastPrivatesReductions; | |||
1311 | llvm::SmallDenseMap<const ValueDecl *, const FieldDecl *> MappedDeclsFields; | |||
1312 | unsigned WarpSize = CGM.getTarget().getGridValue().GV_Warp_Size; | |||
1313 | // Globalize team reductions variable unconditionally in all modes. | |||
1314 | if (getExecutionMode() != CGOpenMPRuntimeGPU::EM_SPMD) | |||
1315 | getTeamsReductionVars(CGM.getContext(), D, LastPrivatesReductions); | |||
1316 | if (getExecutionMode() == CGOpenMPRuntimeGPU::EM_SPMD) { | |||
1317 | getDistributeLastprivateVars(CGM.getContext(), D, LastPrivatesReductions); | |||
1318 | if (!LastPrivatesReductions.empty()) { | |||
1319 | GlobalizedRD = ::buildRecordForGlobalizedVars( | |||
1320 | CGM.getContext(), llvm::None, LastPrivatesReductions, | |||
1321 | MappedDeclsFields, WarpSize); | |||
1322 | } | |||
1323 | } else if (!LastPrivatesReductions.empty()) { | |||
1324 | assert(!TeamAndReductions.first &&(static_cast <bool> (!TeamAndReductions.first && "Previous team declaration is not expected.") ? void (0) : __assert_fail ("!TeamAndReductions.first && \"Previous team declaration is not expected.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 1325, __extension__ __PRETTY_FUNCTION__)) | |||
1325 | "Previous team declaration is not expected.")(static_cast <bool> (!TeamAndReductions.first && "Previous team declaration is not expected.") ? void (0) : __assert_fail ("!TeamAndReductions.first && \"Previous team declaration is not expected.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 1325, __extension__ __PRETTY_FUNCTION__)); | |||
1326 | TeamAndReductions.first = D.getCapturedStmt(OMPD_teams)->getCapturedDecl(); | |||
1327 | std::swap(TeamAndReductions.second, LastPrivatesReductions); | |||
1328 | } | |||
1329 | ||||
1330 | // Emit target region as a standalone region. | |||
1331 | class NVPTXPrePostActionTy : public PrePostActionTy { | |||
1332 | SourceLocation &Loc; | |||
1333 | const RecordDecl *GlobalizedRD; | |||
1334 | llvm::SmallDenseMap<const ValueDecl *, const FieldDecl *> | |||
1335 | &MappedDeclsFields; | |||
1336 | ||||
1337 | public: | |||
1338 | NVPTXPrePostActionTy( | |||
1339 | SourceLocation &Loc, const RecordDecl *GlobalizedRD, | |||
1340 | llvm::SmallDenseMap<const ValueDecl *, const FieldDecl *> | |||
1341 | &MappedDeclsFields) | |||
1342 | : Loc(Loc), GlobalizedRD(GlobalizedRD), | |||
1343 | MappedDeclsFields(MappedDeclsFields) {} | |||
1344 | void Enter(CodeGenFunction &CGF) override { | |||
1345 | auto &Rt = | |||
1346 | static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime()); | |||
1347 | if (GlobalizedRD) { | |||
1348 | auto I = Rt.FunctionGlobalizedDecls.try_emplace(CGF.CurFn).first; | |||
1349 | I->getSecond().MappedParams = | |||
1350 | std::make_unique<CodeGenFunction::OMPMapVars>(); | |||
1351 | DeclToAddrMapTy &Data = I->getSecond().LocalVarData; | |||
1352 | for (const auto &Pair : MappedDeclsFields) { | |||
1353 | assert(Pair.getFirst()->isCanonicalDecl() &&(static_cast <bool> (Pair.getFirst()->isCanonicalDecl () && "Expected canonical declaration") ? void (0) : __assert_fail ("Pair.getFirst()->isCanonicalDecl() && \"Expected canonical declaration\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 1354, __extension__ __PRETTY_FUNCTION__)) | |||
1354 | "Expected canonical declaration")(static_cast <bool> (Pair.getFirst()->isCanonicalDecl () && "Expected canonical declaration") ? void (0) : __assert_fail ("Pair.getFirst()->isCanonicalDecl() && \"Expected canonical declaration\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 1354, __extension__ __PRETTY_FUNCTION__)); | |||
1355 | Data.insert(std::make_pair(Pair.getFirst(), MappedVarData())); | |||
1356 | } | |||
1357 | } | |||
1358 | Rt.emitGenericVarsProlog(CGF, Loc); | |||
1359 | } | |||
1360 | void Exit(CodeGenFunction &CGF) override { | |||
1361 | static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime()) | |||
1362 | .emitGenericVarsEpilog(CGF); | |||
1363 | } | |||
1364 | } Action(Loc, GlobalizedRD, MappedDeclsFields); | |||
1365 | CodeGen.setAction(Action); | |||
1366 | llvm::Function *OutlinedFun = CGOpenMPRuntime::emitTeamsOutlinedFunction( | |||
1367 | D, ThreadIDVar, InnermostKind, CodeGen); | |||
1368 | ||||
1369 | return OutlinedFun; | |||
1370 | } | |||
1371 | ||||
1372 | void CGOpenMPRuntimeGPU::emitGenericVarsProlog(CodeGenFunction &CGF, | |||
1373 | SourceLocation Loc, | |||
1374 | bool WithSPMDCheck) { | |||
1375 | if (getDataSharingMode(CGM) != CGOpenMPRuntimeGPU::Generic && | |||
1376 | getExecutionMode() != CGOpenMPRuntimeGPU::EM_SPMD) | |||
1377 | return; | |||
1378 | ||||
1379 | CGBuilderTy &Bld = CGF.Builder; | |||
1380 | ||||
1381 | const auto I = FunctionGlobalizedDecls.find(CGF.CurFn); | |||
1382 | if (I == FunctionGlobalizedDecls.end()) | |||
1383 | return; | |||
1384 | ||||
1385 | for (auto &Rec : I->getSecond().LocalVarData) { | |||
1386 | const auto *VD = cast<VarDecl>(Rec.first); | |||
1387 | bool EscapedParam = I->getSecond().EscapedParameters.count(Rec.first); | |||
1388 | QualType VarTy = VD->getType(); | |||
1389 | ||||
1390 | // Get the local allocation of a firstprivate variable before sharing | |||
1391 | llvm::Value *ParValue; | |||
1392 | if (EscapedParam) { | |||
1393 | LValue ParLVal = | |||
1394 | CGF.MakeAddrLValue(CGF.GetAddrOfLocalVar(VD), VD->getType()); | |||
1395 | ParValue = CGF.EmitLoadOfScalar(ParLVal, Loc); | |||
1396 | } | |||
1397 | ||||
1398 | // Allocate space for the variable to be globalized | |||
1399 | llvm::Value *AllocArgs[] = {CGF.getTypeSize(VD->getType())}; | |||
1400 | llvm::Instruction *VoidPtr = | |||
1401 | CGF.EmitRuntimeCall(OMPBuilder.getOrCreateRuntimeFunction( | |||
1402 | CGM.getModule(), OMPRTL___kmpc_alloc_shared), | |||
1403 | AllocArgs, VD->getName()); | |||
1404 | ||||
1405 | // Cast the void pointer and get the address of the globalized variable. | |||
1406 | llvm::PointerType *VarPtrTy = CGF.ConvertTypeForMem(VarTy)->getPointerTo(); | |||
1407 | llvm::Value *CastedVoidPtr = Bld.CreatePointerBitCastOrAddrSpaceCast( | |||
1408 | VoidPtr, VarPtrTy, VD->getName() + "_on_stack"); | |||
1409 | LValue VarAddr = CGF.MakeNaturalAlignAddrLValue(CastedVoidPtr, VarTy); | |||
1410 | Rec.second.PrivateAddr = VarAddr.getAddress(CGF); | |||
1411 | Rec.second.GlobalizedVal = VoidPtr; | |||
1412 | ||||
1413 | // Assign the local allocation to the newly globalized location. | |||
1414 | if (EscapedParam) { | |||
1415 | CGF.EmitStoreOfScalar(ParValue, VarAddr); | |||
1416 | I->getSecond().MappedParams->setVarAddr(CGF, VD, VarAddr.getAddress(CGF)); | |||
1417 | } | |||
1418 | if (auto *DI = CGF.getDebugInfo()) | |||
1419 | VoidPtr->setDebugLoc(DI->SourceLocToDebugLoc(VD->getLocation())); | |||
1420 | } | |||
1421 | for (const auto *VD : I->getSecond().EscapedVariableLengthDecls) { | |||
1422 | // Use actual memory size of the VLA object including the padding | |||
1423 | // for alignment purposes. | |||
1424 | llvm::Value *Size = CGF.getTypeSize(VD->getType()); | |||
1425 | CharUnits Align = CGM.getContext().getDeclAlign(VD); | |||
1426 | Size = Bld.CreateNUWAdd( | |||
1427 | Size, llvm::ConstantInt::get(CGF.SizeTy, Align.getQuantity() - 1)); | |||
1428 | llvm::Value *AlignVal = | |||
1429 | llvm::ConstantInt::get(CGF.SizeTy, Align.getQuantity()); | |||
1430 | ||||
1431 | Size = Bld.CreateUDiv(Size, AlignVal); | |||
1432 | Size = Bld.CreateNUWMul(Size, AlignVal); | |||
1433 | ||||
1434 | // Allocate space for this VLA object to be globalized. | |||
1435 | llvm::Value *AllocArgs[] = {CGF.getTypeSize(VD->getType())}; | |||
1436 | llvm::Instruction *VoidPtr = | |||
1437 | CGF.EmitRuntimeCall(OMPBuilder.getOrCreateRuntimeFunction( | |||
1438 | CGM.getModule(), OMPRTL___kmpc_alloc_shared), | |||
1439 | AllocArgs, VD->getName()); | |||
1440 | ||||
1441 | I->getSecond().EscapedVariableLengthDeclsAddrs.emplace_back( | |||
1442 | std::pair<llvm::Value *, llvm::Value *>( | |||
1443 | {VoidPtr, CGF.getTypeSize(VD->getType())})); | |||
1444 | LValue Base = CGF.MakeAddrLValue(VoidPtr, VD->getType(), | |||
1445 | CGM.getContext().getDeclAlign(VD), | |||
1446 | AlignmentSource::Decl); | |||
1447 | I->getSecond().MappedParams->setVarAddr(CGF, cast<VarDecl>(VD), | |||
1448 | Base.getAddress(CGF)); | |||
1449 | } | |||
1450 | I->getSecond().MappedParams->apply(CGF); | |||
1451 | } | |||
1452 | ||||
1453 | void CGOpenMPRuntimeGPU::emitGenericVarsEpilog(CodeGenFunction &CGF, | |||
1454 | bool WithSPMDCheck) { | |||
1455 | if (getDataSharingMode(CGM) != CGOpenMPRuntimeGPU::Generic && | |||
1456 | getExecutionMode() != CGOpenMPRuntimeGPU::EM_SPMD) | |||
1457 | return; | |||
1458 | ||||
1459 | const auto I = FunctionGlobalizedDecls.find(CGF.CurFn); | |||
1460 | if (I != FunctionGlobalizedDecls.end()) { | |||
1461 | // Deallocate the memory for each globalized VLA object | |||
1462 | for (auto AddrSizePair : | |||
1463 | llvm::reverse(I->getSecond().EscapedVariableLengthDeclsAddrs)) { | |||
1464 | CGF.EmitRuntimeCall(OMPBuilder.getOrCreateRuntimeFunction( | |||
1465 | CGM.getModule(), OMPRTL___kmpc_free_shared), | |||
1466 | {AddrSizePair.first, AddrSizePair.second}); | |||
1467 | } | |||
1468 | // Deallocate the memory for each globalized value | |||
1469 | for (auto &Rec : llvm::reverse(I->getSecond().LocalVarData)) { | |||
1470 | const auto *VD = cast<VarDecl>(Rec.first); | |||
1471 | I->getSecond().MappedParams->restore(CGF); | |||
1472 | ||||
1473 | llvm::Value *FreeArgs[] = {Rec.second.GlobalizedVal, | |||
1474 | CGF.getTypeSize(VD->getType())}; | |||
1475 | CGF.EmitRuntimeCall(OMPBuilder.getOrCreateRuntimeFunction( | |||
1476 | CGM.getModule(), OMPRTL___kmpc_free_shared), | |||
1477 | FreeArgs); | |||
1478 | } | |||
1479 | } | |||
1480 | } | |||
1481 | ||||
1482 | void CGOpenMPRuntimeGPU::emitTeamsCall(CodeGenFunction &CGF, | |||
1483 | const OMPExecutableDirective &D, | |||
1484 | SourceLocation Loc, | |||
1485 | llvm::Function *OutlinedFn, | |||
1486 | ArrayRef<llvm::Value *> CapturedVars) { | |||
1487 | if (!CGF.HaveInsertPoint()) | |||
1488 | return; | |||
1489 | ||||
1490 | Address ZeroAddr = CGF.CreateDefaultAlignTempAlloca(CGF.Int32Ty, | |||
1491 | /*Name=*/".zero.addr"); | |||
1492 | CGF.InitTempAlloca(ZeroAddr, CGF.Builder.getInt32(/*C*/ 0)); | |||
1493 | llvm::SmallVector<llvm::Value *, 16> OutlinedFnArgs; | |||
1494 | OutlinedFnArgs.push_back(emitThreadIDAddress(CGF, Loc).getPointer()); | |||
1495 | OutlinedFnArgs.push_back(ZeroAddr.getPointer()); | |||
1496 | OutlinedFnArgs.append(CapturedVars.begin(), CapturedVars.end()); | |||
1497 | emitOutlinedFunctionCall(CGF, Loc, OutlinedFn, OutlinedFnArgs); | |||
1498 | } | |||
1499 | ||||
1500 | void CGOpenMPRuntimeGPU::emitParallelCall(CodeGenFunction &CGF, | |||
1501 | SourceLocation Loc, | |||
1502 | llvm::Function *OutlinedFn, | |||
1503 | ArrayRef<llvm::Value *> CapturedVars, | |||
1504 | const Expr *IfCond) { | |||
1505 | if (!CGF.HaveInsertPoint()) | |||
1506 | return; | |||
1507 | ||||
1508 | auto &&ParallelGen = [this, Loc, OutlinedFn, CapturedVars, | |||
1509 | IfCond](CodeGenFunction &CGF, PrePostActionTy &Action) { | |||
1510 | CGBuilderTy &Bld = CGF.Builder; | |||
1511 | llvm::Function *WFn = WrapperFunctionsMap[OutlinedFn]; | |||
1512 | llvm::Value *ID = llvm::ConstantPointerNull::get(CGM.Int8PtrTy); | |||
1513 | if (WFn) | |||
1514 | ID = Bld.CreateBitOrPointerCast(WFn, CGM.Int8PtrTy); | |||
1515 | llvm::Value *FnPtr = Bld.CreateBitOrPointerCast(OutlinedFn, CGM.Int8PtrTy); | |||
1516 | ||||
1517 | // Create a private scope that will globalize the arguments | |||
1518 | // passed from the outside of the target region. | |||
1519 | // TODO: Is that needed? | |||
1520 | CodeGenFunction::OMPPrivateScope PrivateArgScope(CGF); | |||
1521 | ||||
1522 | Address CapturedVarsAddrs = CGF.CreateDefaultAlignTempAlloca( | |||
1523 | llvm::ArrayType::get(CGM.VoidPtrTy, CapturedVars.size()), | |||
1524 | "captured_vars_addrs"); | |||
1525 | // There's something to share. | |||
1526 | if (!CapturedVars.empty()) { | |||
1527 | // Prepare for parallel region. Indicate the outlined function. | |||
1528 | ASTContext &Ctx = CGF.getContext(); | |||
1529 | unsigned Idx = 0; | |||
1530 | for (llvm::Value *V : CapturedVars) { | |||
1531 | Address Dst = Bld.CreateConstArrayGEP(CapturedVarsAddrs, Idx); | |||
1532 | llvm::Value *PtrV; | |||
1533 | if (V->getType()->isIntegerTy()) | |||
1534 | PtrV = Bld.CreateIntToPtr(V, CGF.VoidPtrTy); | |||
1535 | else | |||
1536 | PtrV = Bld.CreatePointerBitCastOrAddrSpaceCast(V, CGF.VoidPtrTy); | |||
1537 | CGF.EmitStoreOfScalar(PtrV, Dst, /*Volatile=*/false, | |||
1538 | Ctx.getPointerType(Ctx.VoidPtrTy)); | |||
1539 | ++Idx; | |||
1540 | } | |||
1541 | } | |||
1542 | ||||
1543 | llvm::Value *IfCondVal = nullptr; | |||
1544 | if (IfCond) | |||
1545 | IfCondVal = Bld.CreateIntCast(CGF.EvaluateExprAsBool(IfCond), CGF.Int32Ty, | |||
1546 | /* isSigned */ false); | |||
1547 | else | |||
1548 | IfCondVal = llvm::ConstantInt::get(CGF.Int32Ty, 1); | |||
1549 | ||||
1550 | assert(IfCondVal && "Expected a value")(static_cast <bool> (IfCondVal && "Expected a value" ) ? void (0) : __assert_fail ("IfCondVal && \"Expected a value\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 1550, __extension__ __PRETTY_FUNCTION__)); | |||
1551 | llvm::Value *RTLoc = emitUpdateLocation(CGF, Loc); | |||
1552 | llvm::Value *Args[] = { | |||
1553 | RTLoc, | |||
1554 | getThreadID(CGF, Loc), | |||
1555 | IfCondVal, | |||
1556 | llvm::ConstantInt::get(CGF.Int32Ty, -1), | |||
1557 | llvm::ConstantInt::get(CGF.Int32Ty, -1), | |||
1558 | FnPtr, | |||
1559 | ID, | |||
1560 | Bld.CreateBitOrPointerCast(CapturedVarsAddrs.getPointer(), | |||
1561 | CGF.VoidPtrPtrTy), | |||
1562 | llvm::ConstantInt::get(CGM.SizeTy, CapturedVars.size())}; | |||
1563 | CGF.EmitRuntimeCall(OMPBuilder.getOrCreateRuntimeFunction( | |||
1564 | CGM.getModule(), OMPRTL___kmpc_parallel_51), | |||
1565 | Args); | |||
1566 | }; | |||
1567 | ||||
1568 | RegionCodeGenTy RCG(ParallelGen); | |||
1569 | RCG(CGF); | |||
1570 | } | |||
1571 | ||||
1572 | void CGOpenMPRuntimeGPU::syncCTAThreads(CodeGenFunction &CGF) { | |||
1573 | // Always emit simple barriers! | |||
1574 | if (!CGF.HaveInsertPoint()) | |||
1575 | return; | |||
1576 | // Build call __kmpc_barrier_simple_spmd(nullptr, 0); | |||
1577 | // This function does not use parameters, so we can emit just default values. | |||
1578 | llvm::Value *Args[] = { | |||
1579 | llvm::ConstantPointerNull::get( | |||
1580 | cast<llvm::PointerType>(getIdentTyPointerTy())), | |||
1581 | llvm::ConstantInt::get(CGF.Int32Ty, /*V=*/0, /*isSigned=*/true)}; | |||
1582 | CGF.EmitRuntimeCall(OMPBuilder.getOrCreateRuntimeFunction( | |||
1583 | CGM.getModule(), OMPRTL___kmpc_barrier_simple_spmd), | |||
1584 | Args); | |||
1585 | } | |||
1586 | ||||
1587 | void CGOpenMPRuntimeGPU::emitBarrierCall(CodeGenFunction &CGF, | |||
1588 | SourceLocation Loc, | |||
1589 | OpenMPDirectiveKind Kind, bool, | |||
1590 | bool) { | |||
1591 | // Always emit simple barriers! | |||
1592 | if (!CGF.HaveInsertPoint()) | |||
1593 | return; | |||
1594 | // Build call __kmpc_cancel_barrier(loc, thread_id); | |||
1595 | unsigned Flags = getDefaultFlagsForBarriers(Kind); | |||
1596 | llvm::Value *Args[] = {emitUpdateLocation(CGF, Loc, Flags), | |||
1597 | getThreadID(CGF, Loc)}; | |||
1598 | ||||
1599 | CGF.EmitRuntimeCall(OMPBuilder.getOrCreateRuntimeFunction( | |||
1600 | CGM.getModule(), OMPRTL___kmpc_barrier), | |||
1601 | Args); | |||
1602 | } | |||
1603 | ||||
1604 | void CGOpenMPRuntimeGPU::emitCriticalRegion( | |||
1605 | CodeGenFunction &CGF, StringRef CriticalName, | |||
1606 | const RegionCodeGenTy &CriticalOpGen, SourceLocation Loc, | |||
1607 | const Expr *Hint) { | |||
1608 | llvm::BasicBlock *LoopBB = CGF.createBasicBlock("omp.critical.loop"); | |||
1609 | llvm::BasicBlock *TestBB = CGF.createBasicBlock("omp.critical.test"); | |||
1610 | llvm::BasicBlock *SyncBB = CGF.createBasicBlock("omp.critical.sync"); | |||
1611 | llvm::BasicBlock *BodyBB = CGF.createBasicBlock("omp.critical.body"); | |||
1612 | llvm::BasicBlock *ExitBB = CGF.createBasicBlock("omp.critical.exit"); | |||
1613 | ||||
1614 | auto &RT = static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime()); | |||
1615 | ||||
1616 | // Get the mask of active threads in the warp. | |||
1617 | llvm::Value *Mask = CGF.EmitRuntimeCall(OMPBuilder.getOrCreateRuntimeFunction( | |||
1618 | CGM.getModule(), OMPRTL___kmpc_warp_active_thread_mask)); | |||
1619 | // Fetch team-local id of the thread. | |||
1620 | llvm::Value *ThreadID = RT.getGPUThreadID(CGF); | |||
1621 | ||||
1622 | // Get the width of the team. | |||
1623 | llvm::Value *TeamWidth = RT.getGPUNumThreads(CGF); | |||
1624 | ||||
1625 | // Initialize the counter variable for the loop. | |||
1626 | QualType Int32Ty = | |||
1627 | CGF.getContext().getIntTypeForBitwidth(/*DestWidth=*/32, /*Signed=*/0); | |||
1628 | Address Counter = CGF.CreateMemTemp(Int32Ty, "critical_counter"); | |||
1629 | LValue CounterLVal = CGF.MakeAddrLValue(Counter, Int32Ty); | |||
1630 | CGF.EmitStoreOfScalar(llvm::Constant::getNullValue(CGM.Int32Ty), CounterLVal, | |||
1631 | /*isInit=*/true); | |||
1632 | ||||
1633 | // Block checks if loop counter exceeds upper bound. | |||
1634 | CGF.EmitBlock(LoopBB); | |||
1635 | llvm::Value *CounterVal = CGF.EmitLoadOfScalar(CounterLVal, Loc); | |||
1636 | llvm::Value *CmpLoopBound = CGF.Builder.CreateICmpSLT(CounterVal, TeamWidth); | |||
1637 | CGF.Builder.CreateCondBr(CmpLoopBound, TestBB, ExitBB); | |||
1638 | ||||
1639 | // Block tests which single thread should execute region, and which threads | |||
1640 | // should go straight to synchronisation point. | |||
1641 | CGF.EmitBlock(TestBB); | |||
1642 | CounterVal = CGF.EmitLoadOfScalar(CounterLVal, Loc); | |||
1643 | llvm::Value *CmpThreadToCounter = | |||
1644 | CGF.Builder.CreateICmpEQ(ThreadID, CounterVal); | |||
1645 | CGF.Builder.CreateCondBr(CmpThreadToCounter, BodyBB, SyncBB); | |||
1646 | ||||
1647 | // Block emits the body of the critical region. | |||
1648 | CGF.EmitBlock(BodyBB); | |||
1649 | ||||
1650 | // Output the critical statement. | |||
1651 | CGOpenMPRuntime::emitCriticalRegion(CGF, CriticalName, CriticalOpGen, Loc, | |||
1652 | Hint); | |||
1653 | ||||
1654 | // After the body surrounded by the critical region, the single executing | |||
1655 | // thread will jump to the synchronisation point. | |||
1656 | // Block waits for all threads in current team to finish then increments the | |||
1657 | // counter variable and returns to the loop. | |||
1658 | CGF.EmitBlock(SyncBB); | |||
1659 | // Reconverge active threads in the warp. | |||
1660 | (void)CGF.EmitRuntimeCall(OMPBuilder.getOrCreateRuntimeFunction( | |||
1661 | CGM.getModule(), OMPRTL___kmpc_syncwarp), | |||
1662 | Mask); | |||
1663 | ||||
1664 | llvm::Value *IncCounterVal = | |||
1665 | CGF.Builder.CreateNSWAdd(CounterVal, CGF.Builder.getInt32(1)); | |||
1666 | CGF.EmitStoreOfScalar(IncCounterVal, CounterLVal); | |||
1667 | CGF.EmitBranch(LoopBB); | |||
1668 | ||||
1669 | // Block that is reached when all threads in the team complete the region. | |||
1670 | CGF.EmitBlock(ExitBB, /*IsFinished=*/true); | |||
1671 | } | |||
1672 | ||||
1673 | /// Cast value to the specified type. | |||
1674 | static llvm::Value *castValueToType(CodeGenFunction &CGF, llvm::Value *Val, | |||
1675 | QualType ValTy, QualType CastTy, | |||
1676 | SourceLocation Loc) { | |||
1677 | assert(!CGF.getContext().getTypeSizeInChars(CastTy).isZero() &&(static_cast <bool> (!CGF.getContext().getTypeSizeInChars (CastTy).isZero() && "Cast type must sized.") ? void ( 0) : __assert_fail ("!CGF.getContext().getTypeSizeInChars(CastTy).isZero() && \"Cast type must sized.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 1678, __extension__ __PRETTY_FUNCTION__)) | |||
1678 | "Cast type must sized.")(static_cast <bool> (!CGF.getContext().getTypeSizeInChars (CastTy).isZero() && "Cast type must sized.") ? void ( 0) : __assert_fail ("!CGF.getContext().getTypeSizeInChars(CastTy).isZero() && \"Cast type must sized.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 1678, __extension__ __PRETTY_FUNCTION__)); | |||
1679 | assert(!CGF.getContext().getTypeSizeInChars(ValTy).isZero() &&(static_cast <bool> (!CGF.getContext().getTypeSizeInChars (ValTy).isZero() && "Val type must sized.") ? void (0 ) : __assert_fail ("!CGF.getContext().getTypeSizeInChars(ValTy).isZero() && \"Val type must sized.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 1680, __extension__ __PRETTY_FUNCTION__)) | |||
1680 | "Val type must sized.")(static_cast <bool> (!CGF.getContext().getTypeSizeInChars (ValTy).isZero() && "Val type must sized.") ? void (0 ) : __assert_fail ("!CGF.getContext().getTypeSizeInChars(ValTy).isZero() && \"Val type must sized.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 1680, __extension__ __PRETTY_FUNCTION__)); | |||
1681 | llvm::Type *LLVMCastTy = CGF.ConvertTypeForMem(CastTy); | |||
1682 | if (ValTy == CastTy) | |||
1683 | return Val; | |||
1684 | if (CGF.getContext().getTypeSizeInChars(ValTy) == | |||
1685 | CGF.getContext().getTypeSizeInChars(CastTy)) | |||
1686 | return CGF.Builder.CreateBitCast(Val, LLVMCastTy); | |||
1687 | if (CastTy->isIntegerType() && ValTy->isIntegerType()) | |||
1688 | return CGF.Builder.CreateIntCast(Val, LLVMCastTy, | |||
1689 | CastTy->hasSignedIntegerRepresentation()); | |||
1690 | Address CastItem = CGF.CreateMemTemp(CastTy); | |||
1691 | Address ValCastItem = CGF.Builder.CreatePointerBitCastOrAddrSpaceCast( | |||
1692 | CastItem, Val->getType()->getPointerTo(CastItem.getAddressSpace())); | |||
1693 | CGF.EmitStoreOfScalar(Val, ValCastItem, /*Volatile=*/false, ValTy, | |||
1694 | LValueBaseInfo(AlignmentSource::Type), | |||
1695 | TBAAAccessInfo()); | |||
1696 | return CGF.EmitLoadOfScalar(CastItem, /*Volatile=*/false, CastTy, Loc, | |||
1697 | LValueBaseInfo(AlignmentSource::Type), | |||
1698 | TBAAAccessInfo()); | |||
1699 | } | |||
1700 | ||||
1701 | /// This function creates calls to one of two shuffle functions to copy | |||
1702 | /// variables between lanes in a warp. | |||
1703 | static llvm::Value *createRuntimeShuffleFunction(CodeGenFunction &CGF, | |||
1704 | llvm::Value *Elem, | |||
1705 | QualType ElemType, | |||
1706 | llvm::Value *Offset, | |||
1707 | SourceLocation Loc) { | |||
1708 | CodeGenModule &CGM = CGF.CGM; | |||
1709 | CGBuilderTy &Bld = CGF.Builder; | |||
1710 | CGOpenMPRuntimeGPU &RT = | |||
1711 | *(static_cast<CGOpenMPRuntimeGPU *>(&CGM.getOpenMPRuntime())); | |||
1712 | llvm::OpenMPIRBuilder &OMPBuilder = RT.getOMPBuilder(); | |||
1713 | ||||
1714 | CharUnits Size = CGF.getContext().getTypeSizeInChars(ElemType); | |||
1715 | assert(Size.getQuantity() <= 8 &&(static_cast <bool> (Size.getQuantity() <= 8 && "Unsupported bitwidth in shuffle instruction.") ? void (0) : __assert_fail ("Size.getQuantity() <= 8 && \"Unsupported bitwidth in shuffle instruction.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 1716, __extension__ __PRETTY_FUNCTION__)) | |||
1716 | "Unsupported bitwidth in shuffle instruction.")(static_cast <bool> (Size.getQuantity() <= 8 && "Unsupported bitwidth in shuffle instruction.") ? void (0) : __assert_fail ("Size.getQuantity() <= 8 && \"Unsupported bitwidth in shuffle instruction.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 1716, __extension__ __PRETTY_FUNCTION__)); | |||
1717 | ||||
1718 | RuntimeFunction ShuffleFn = Size.getQuantity() <= 4 | |||
1719 | ? OMPRTL___kmpc_shuffle_int32 | |||
1720 | : OMPRTL___kmpc_shuffle_int64; | |||
1721 | ||||
1722 | // Cast all types to 32- or 64-bit values before calling shuffle routines. | |||
1723 | QualType CastTy = CGF.getContext().getIntTypeForBitwidth( | |||
1724 | Size.getQuantity() <= 4 ? 32 : 64, /*Signed=*/1); | |||
1725 | llvm::Value *ElemCast = castValueToType(CGF, Elem, ElemType, CastTy, Loc); | |||
1726 | llvm::Value *WarpSize = | |||
1727 | Bld.CreateIntCast(RT.getGPUWarpSize(CGF), CGM.Int16Ty, /*isSigned=*/true); | |||
1728 | ||||
1729 | llvm::Value *ShuffledVal = CGF.EmitRuntimeCall( | |||
1730 | OMPBuilder.getOrCreateRuntimeFunction(CGM.getModule(), ShuffleFn), | |||
1731 | {ElemCast, Offset, WarpSize}); | |||
1732 | ||||
1733 | return castValueToType(CGF, ShuffledVal, CastTy, ElemType, Loc); | |||
1734 | } | |||
1735 | ||||
1736 | static void shuffleAndStore(CodeGenFunction &CGF, Address SrcAddr, | |||
1737 | Address DestAddr, QualType ElemType, | |||
1738 | llvm::Value *Offset, SourceLocation Loc) { | |||
1739 | CGBuilderTy &Bld = CGF.Builder; | |||
1740 | ||||
1741 | CharUnits Size = CGF.getContext().getTypeSizeInChars(ElemType); | |||
1742 | // Create the loop over the big sized data. | |||
1743 | // ptr = (void*)Elem; | |||
1744 | // ptrEnd = (void*) Elem + 1; | |||
1745 | // Step = 8; | |||
1746 | // while (ptr + Step < ptrEnd) | |||
1747 | // shuffle((int64_t)*ptr); | |||
1748 | // Step = 4; | |||
1749 | // while (ptr + Step < ptrEnd) | |||
1750 | // shuffle((int32_t)*ptr); | |||
1751 | // ... | |||
1752 | Address ElemPtr = DestAddr; | |||
1753 | Address Ptr = SrcAddr; | |||
1754 | Address PtrEnd = Bld.CreatePointerBitCastOrAddrSpaceCast( | |||
1755 | Bld.CreateConstGEP(SrcAddr, 1), CGF.VoidPtrTy); | |||
1756 | for (int IntSize = 8; IntSize >= 1; IntSize /= 2) { | |||
1757 | if (Size < CharUnits::fromQuantity(IntSize)) | |||
1758 | continue; | |||
1759 | QualType IntType = CGF.getContext().getIntTypeForBitwidth( | |||
1760 | CGF.getContext().toBits(CharUnits::fromQuantity(IntSize)), | |||
1761 | /*Signed=*/1); | |||
1762 | llvm::Type *IntTy = CGF.ConvertTypeForMem(IntType); | |||
1763 | Ptr = Bld.CreatePointerBitCastOrAddrSpaceCast(Ptr, IntTy->getPointerTo()); | |||
1764 | ElemPtr = | |||
1765 | Bld.CreatePointerBitCastOrAddrSpaceCast(ElemPtr, IntTy->getPointerTo()); | |||
1766 | if (Size.getQuantity() / IntSize > 1) { | |||
1767 | llvm::BasicBlock *PreCondBB = CGF.createBasicBlock(".shuffle.pre_cond"); | |||
1768 | llvm::BasicBlock *ThenBB = CGF.createBasicBlock(".shuffle.then"); | |||
1769 | llvm::BasicBlock *ExitBB = CGF.createBasicBlock(".shuffle.exit"); | |||
1770 | llvm::BasicBlock *CurrentBB = Bld.GetInsertBlock(); | |||
1771 | CGF.EmitBlock(PreCondBB); | |||
1772 | llvm::PHINode *PhiSrc = | |||
1773 | Bld.CreatePHI(Ptr.getType(), /*NumReservedValues=*/2); | |||
1774 | PhiSrc->addIncoming(Ptr.getPointer(), CurrentBB); | |||
1775 | llvm::PHINode *PhiDest = | |||
1776 | Bld.CreatePHI(ElemPtr.getType(), /*NumReservedValues=*/2); | |||
1777 | PhiDest->addIncoming(ElemPtr.getPointer(), CurrentBB); | |||
1778 | Ptr = Address(PhiSrc, Ptr.getAlignment()); | |||
1779 | ElemPtr = Address(PhiDest, ElemPtr.getAlignment()); | |||
1780 | llvm::Value *PtrDiff = Bld.CreatePtrDiff( | |||
1781 | PtrEnd.getPointer(), Bld.CreatePointerBitCastOrAddrSpaceCast( | |||
1782 | Ptr.getPointer(), CGF.VoidPtrTy)); | |||
1783 | Bld.CreateCondBr(Bld.CreateICmpSGT(PtrDiff, Bld.getInt64(IntSize - 1)), | |||
1784 | ThenBB, ExitBB); | |||
1785 | CGF.EmitBlock(ThenBB); | |||
1786 | llvm::Value *Res = createRuntimeShuffleFunction( | |||
1787 | CGF, | |||
1788 | CGF.EmitLoadOfScalar(Ptr, /*Volatile=*/false, IntType, Loc, | |||
1789 | LValueBaseInfo(AlignmentSource::Type), | |||
1790 | TBAAAccessInfo()), | |||
1791 | IntType, Offset, Loc); | |||
1792 | CGF.EmitStoreOfScalar(Res, ElemPtr, /*Volatile=*/false, IntType, | |||
1793 | LValueBaseInfo(AlignmentSource::Type), | |||
1794 | TBAAAccessInfo()); | |||
1795 | Address LocalPtr = Bld.CreateConstGEP(Ptr, 1); | |||
1796 | Address LocalElemPtr = Bld.CreateConstGEP(ElemPtr, 1); | |||
1797 | PhiSrc->addIncoming(LocalPtr.getPointer(), ThenBB); | |||
1798 | PhiDest->addIncoming(LocalElemPtr.getPointer(), ThenBB); | |||
1799 | CGF.EmitBranch(PreCondBB); | |||
1800 | CGF.EmitBlock(ExitBB); | |||
1801 | } else { | |||
1802 | llvm::Value *Res = createRuntimeShuffleFunction( | |||
1803 | CGF, | |||
1804 | CGF.EmitLoadOfScalar(Ptr, /*Volatile=*/false, IntType, Loc, | |||
1805 | LValueBaseInfo(AlignmentSource::Type), | |||
1806 | TBAAAccessInfo()), | |||
1807 | IntType, Offset, Loc); | |||
1808 | CGF.EmitStoreOfScalar(Res, ElemPtr, /*Volatile=*/false, IntType, | |||
1809 | LValueBaseInfo(AlignmentSource::Type), | |||
1810 | TBAAAccessInfo()); | |||
1811 | Ptr = Bld.CreateConstGEP(Ptr, 1); | |||
1812 | ElemPtr = Bld.CreateConstGEP(ElemPtr, 1); | |||
1813 | } | |||
1814 | Size = Size % IntSize; | |||
1815 | } | |||
1816 | } | |||
1817 | ||||
1818 | namespace { | |||
1819 | enum CopyAction : unsigned { | |||
1820 | // RemoteLaneToThread: Copy over a Reduce list from a remote lane in | |||
1821 | // the warp using shuffle instructions. | |||
1822 | RemoteLaneToThread, | |||
1823 | // ThreadCopy: Make a copy of a Reduce list on the thread's stack. | |||
1824 | ThreadCopy, | |||
1825 | // ThreadToScratchpad: Copy a team-reduced array to the scratchpad. | |||
1826 | ThreadToScratchpad, | |||
1827 | // ScratchpadToThread: Copy from a scratchpad array in global memory | |||
1828 | // containing team-reduced data to a thread's stack. | |||
1829 | ScratchpadToThread, | |||
1830 | }; | |||
1831 | } // namespace | |||
1832 | ||||
1833 | struct CopyOptionsTy { | |||
1834 | llvm::Value *RemoteLaneOffset; | |||
1835 | llvm::Value *ScratchpadIndex; | |||
1836 | llvm::Value *ScratchpadWidth; | |||
1837 | }; | |||
1838 | ||||
1839 | /// Emit instructions to copy a Reduce list, which contains partially | |||
1840 | /// aggregated values, in the specified direction. | |||
1841 | static void emitReductionListCopy( | |||
1842 | CopyAction Action, CodeGenFunction &CGF, QualType ReductionArrayTy, | |||
1843 | ArrayRef<const Expr *> Privates, Address SrcBase, Address DestBase, | |||
1844 | CopyOptionsTy CopyOptions = {nullptr, nullptr, nullptr}) { | |||
1845 | ||||
1846 | CodeGenModule &CGM = CGF.CGM; | |||
1847 | ASTContext &C = CGM.getContext(); | |||
1848 | CGBuilderTy &Bld = CGF.Builder; | |||
1849 | ||||
1850 | llvm::Value *RemoteLaneOffset = CopyOptions.RemoteLaneOffset; | |||
1851 | llvm::Value *ScratchpadIndex = CopyOptions.ScratchpadIndex; | |||
1852 | llvm::Value *ScratchpadWidth = CopyOptions.ScratchpadWidth; | |||
1853 | ||||
1854 | // Iterates, element-by-element, through the source Reduce list and | |||
1855 | // make a copy. | |||
1856 | unsigned Idx = 0; | |||
1857 | unsigned Size = Privates.size(); | |||
1858 | for (const Expr *Private : Privates) { | |||
1859 | Address SrcElementAddr = Address::invalid(); | |||
1860 | Address DestElementAddr = Address::invalid(); | |||
1861 | Address DestElementPtrAddr = Address::invalid(); | |||
1862 | // Should we shuffle in an element from a remote lane? | |||
1863 | bool ShuffleInElement = false; | |||
1864 | // Set to true to update the pointer in the dest Reduce list to a | |||
1865 | // newly created element. | |||
1866 | bool UpdateDestListPtr = false; | |||
1867 | // Increment the src or dest pointer to the scratchpad, for each | |||
1868 | // new element. | |||
1869 | bool IncrScratchpadSrc = false; | |||
1870 | bool IncrScratchpadDest = false; | |||
1871 | ||||
1872 | switch (Action) { | |||
1873 | case RemoteLaneToThread: { | |||
1874 | // Step 1.1: Get the address for the src element in the Reduce list. | |||
1875 | Address SrcElementPtrAddr = Bld.CreateConstArrayGEP(SrcBase, Idx); | |||
1876 | SrcElementAddr = CGF.EmitLoadOfPointer( | |||
1877 | SrcElementPtrAddr, | |||
1878 | C.getPointerType(Private->getType())->castAs<PointerType>()); | |||
1879 | ||||
1880 | // Step 1.2: Create a temporary to store the element in the destination | |||
1881 | // Reduce list. | |||
1882 | DestElementPtrAddr = Bld.CreateConstArrayGEP(DestBase, Idx); | |||
1883 | DestElementAddr = | |||
1884 | CGF.CreateMemTemp(Private->getType(), ".omp.reduction.element"); | |||
1885 | ShuffleInElement = true; | |||
1886 | UpdateDestListPtr = true; | |||
1887 | break; | |||
1888 | } | |||
1889 | case ThreadCopy: { | |||
1890 | // Step 1.1: Get the address for the src element in the Reduce list. | |||
1891 | Address SrcElementPtrAddr = Bld.CreateConstArrayGEP(SrcBase, Idx); | |||
1892 | SrcElementAddr = CGF.EmitLoadOfPointer( | |||
1893 | SrcElementPtrAddr, | |||
1894 | C.getPointerType(Private->getType())->castAs<PointerType>()); | |||
1895 | ||||
1896 | // Step 1.2: Get the address for dest element. The destination | |||
1897 | // element has already been created on the thread's stack. | |||
1898 | DestElementPtrAddr = Bld.CreateConstArrayGEP(DestBase, Idx); | |||
1899 | DestElementAddr = CGF.EmitLoadOfPointer( | |||
1900 | DestElementPtrAddr, | |||
1901 | C.getPointerType(Private->getType())->castAs<PointerType>()); | |||
1902 | break; | |||
1903 | } | |||
1904 | case ThreadToScratchpad: { | |||
1905 | // Step 1.1: Get the address for the src element in the Reduce list. | |||
1906 | Address SrcElementPtrAddr = Bld.CreateConstArrayGEP(SrcBase, Idx); | |||
1907 | SrcElementAddr = CGF.EmitLoadOfPointer( | |||
1908 | SrcElementPtrAddr, | |||
1909 | C.getPointerType(Private->getType())->castAs<PointerType>()); | |||
1910 | ||||
1911 | // Step 1.2: Get the address for dest element: | |||
1912 | // address = base + index * ElementSizeInChars. | |||
1913 | llvm::Value *ElementSizeInChars = CGF.getTypeSize(Private->getType()); | |||
1914 | llvm::Value *CurrentOffset = | |||
1915 | Bld.CreateNUWMul(ElementSizeInChars, ScratchpadIndex); | |||
1916 | llvm::Value *ScratchPadElemAbsolutePtrVal = | |||
1917 | Bld.CreateNUWAdd(DestBase.getPointer(), CurrentOffset); | |||
1918 | ScratchPadElemAbsolutePtrVal = | |||
1919 | Bld.CreateIntToPtr(ScratchPadElemAbsolutePtrVal, CGF.VoidPtrTy); | |||
1920 | DestElementAddr = Address(ScratchPadElemAbsolutePtrVal, | |||
1921 | C.getTypeAlignInChars(Private->getType())); | |||
1922 | IncrScratchpadDest = true; | |||
1923 | break; | |||
1924 | } | |||
1925 | case ScratchpadToThread: { | |||
1926 | // Step 1.1: Get the address for the src element in the scratchpad. | |||
1927 | // address = base + index * ElementSizeInChars. | |||
1928 | llvm::Value *ElementSizeInChars = CGF.getTypeSize(Private->getType()); | |||
1929 | llvm::Value *CurrentOffset = | |||
1930 | Bld.CreateNUWMul(ElementSizeInChars, ScratchpadIndex); | |||
1931 | llvm::Value *ScratchPadElemAbsolutePtrVal = | |||
1932 | Bld.CreateNUWAdd(SrcBase.getPointer(), CurrentOffset); | |||
1933 | ScratchPadElemAbsolutePtrVal = | |||
1934 | Bld.CreateIntToPtr(ScratchPadElemAbsolutePtrVal, CGF.VoidPtrTy); | |||
1935 | SrcElementAddr = Address(ScratchPadElemAbsolutePtrVal, | |||
1936 | C.getTypeAlignInChars(Private->getType())); | |||
1937 | IncrScratchpadSrc = true; | |||
1938 | ||||
1939 | // Step 1.2: Create a temporary to store the element in the destination | |||
1940 | // Reduce list. | |||
1941 | DestElementPtrAddr = Bld.CreateConstArrayGEP(DestBase, Idx); | |||
1942 | DestElementAddr = | |||
1943 | CGF.CreateMemTemp(Private->getType(), ".omp.reduction.element"); | |||
1944 | UpdateDestListPtr = true; | |||
1945 | break; | |||
1946 | } | |||
1947 | } | |||
1948 | ||||
1949 | // Regardless of src and dest of copy, we emit the load of src | |||
1950 | // element as this is required in all directions | |||
1951 | SrcElementAddr = Bld.CreateElementBitCast( | |||
1952 | SrcElementAddr, CGF.ConvertTypeForMem(Private->getType())); | |||
1953 | DestElementAddr = Bld.CreateElementBitCast(DestElementAddr, | |||
1954 | SrcElementAddr.getElementType()); | |||
1955 | ||||
1956 | // Now that all active lanes have read the element in the | |||
1957 | // Reduce list, shuffle over the value from the remote lane. | |||
1958 | if (ShuffleInElement) { | |||
1959 | shuffleAndStore(CGF, SrcElementAddr, DestElementAddr, Private->getType(), | |||
1960 | RemoteLaneOffset, Private->getExprLoc()); | |||
1961 | } else { | |||
1962 | switch (CGF.getEvaluationKind(Private->getType())) { | |||
1963 | case TEK_Scalar: { | |||
1964 | llvm::Value *Elem = CGF.EmitLoadOfScalar( | |||
1965 | SrcElementAddr, /*Volatile=*/false, Private->getType(), | |||
1966 | Private->getExprLoc(), LValueBaseInfo(AlignmentSource::Type), | |||
1967 | TBAAAccessInfo()); | |||
1968 | // Store the source element value to the dest element address. | |||
1969 | CGF.EmitStoreOfScalar( | |||
1970 | Elem, DestElementAddr, /*Volatile=*/false, Private->getType(), | |||
1971 | LValueBaseInfo(AlignmentSource::Type), TBAAAccessInfo()); | |||
1972 | break; | |||
1973 | } | |||
1974 | case TEK_Complex: { | |||
1975 | CodeGenFunction::ComplexPairTy Elem = CGF.EmitLoadOfComplex( | |||
1976 | CGF.MakeAddrLValue(SrcElementAddr, Private->getType()), | |||
1977 | Private->getExprLoc()); | |||
1978 | CGF.EmitStoreOfComplex( | |||
1979 | Elem, CGF.MakeAddrLValue(DestElementAddr, Private->getType()), | |||
1980 | /*isInit=*/false); | |||
1981 | break; | |||
1982 | } | |||
1983 | case TEK_Aggregate: | |||
1984 | CGF.EmitAggregateCopy( | |||
1985 | CGF.MakeAddrLValue(DestElementAddr, Private->getType()), | |||
1986 | CGF.MakeAddrLValue(SrcElementAddr, Private->getType()), | |||
1987 | Private->getType(), AggValueSlot::DoesNotOverlap); | |||
1988 | break; | |||
1989 | } | |||
1990 | } | |||
1991 | ||||
1992 | // Step 3.1: Modify reference in dest Reduce list as needed. | |||
1993 | // Modifying the reference in Reduce list to point to the newly | |||
1994 | // created element. The element is live in the current function | |||
1995 | // scope and that of functions it invokes (i.e., reduce_function). | |||
1996 | // RemoteReduceData[i] = (void*)&RemoteElem | |||
1997 | if (UpdateDestListPtr) { | |||
1998 | CGF.EmitStoreOfScalar(Bld.CreatePointerBitCastOrAddrSpaceCast( | |||
1999 | DestElementAddr.getPointer(), CGF.VoidPtrTy), | |||
2000 | DestElementPtrAddr, /*Volatile=*/false, | |||
2001 | C.VoidPtrTy); | |||
2002 | } | |||
2003 | ||||
2004 | // Step 4.1: Increment SrcBase/DestBase so that it points to the starting | |||
2005 | // address of the next element in scratchpad memory, unless we're currently | |||
2006 | // processing the last one. Memory alignment is also taken care of here. | |||
2007 | if ((IncrScratchpadDest || IncrScratchpadSrc) && (Idx + 1 < Size)) { | |||
2008 | llvm::Value *ScratchpadBasePtr = | |||
2009 | IncrScratchpadDest ? DestBase.getPointer() : SrcBase.getPointer(); | |||
2010 | llvm::Value *ElementSizeInChars = CGF.getTypeSize(Private->getType()); | |||
2011 | ScratchpadBasePtr = Bld.CreateNUWAdd( | |||
2012 | ScratchpadBasePtr, | |||
2013 | Bld.CreateNUWMul(ScratchpadWidth, ElementSizeInChars)); | |||
2014 | ||||
2015 | // Take care of global memory alignment for performance | |||
2016 | ScratchpadBasePtr = Bld.CreateNUWSub( | |||
2017 | ScratchpadBasePtr, llvm::ConstantInt::get(CGM.SizeTy, 1)); | |||
2018 | ScratchpadBasePtr = Bld.CreateUDiv( | |||
2019 | ScratchpadBasePtr, | |||
2020 | llvm::ConstantInt::get(CGM.SizeTy, GlobalMemoryAlignment)); | |||
2021 | ScratchpadBasePtr = Bld.CreateNUWAdd( | |||
2022 | ScratchpadBasePtr, llvm::ConstantInt::get(CGM.SizeTy, 1)); | |||
2023 | ScratchpadBasePtr = Bld.CreateNUWMul( | |||
2024 | ScratchpadBasePtr, | |||
2025 | llvm::ConstantInt::get(CGM.SizeTy, GlobalMemoryAlignment)); | |||
2026 | ||||
2027 | if (IncrScratchpadDest) | |||
2028 | DestBase = Address(ScratchpadBasePtr, CGF.getPointerAlign()); | |||
2029 | else /* IncrScratchpadSrc = true */ | |||
2030 | SrcBase = Address(ScratchpadBasePtr, CGF.getPointerAlign()); | |||
2031 | } | |||
2032 | ||||
2033 | ++Idx; | |||
2034 | } | |||
2035 | } | |||
2036 | ||||
2037 | /// This function emits a helper that gathers Reduce lists from the first | |||
2038 | /// lane of every active warp to lanes in the first warp. | |||
2039 | /// | |||
2040 | /// void inter_warp_copy_func(void* reduce_data, num_warps) | |||
2041 | /// shared smem[warp_size]; | |||
2042 | /// For all data entries D in reduce_data: | |||
2043 | /// sync | |||
2044 | /// If (I am the first lane in each warp) | |||
2045 | /// Copy my local D to smem[warp_id] | |||
2046 | /// sync | |||
2047 | /// if (I am the first warp) | |||
2048 | /// Copy smem[thread_id] to my local D | |||
2049 | static llvm::Value *emitInterWarpCopyFunction(CodeGenModule &CGM, | |||
2050 | ArrayRef<const Expr *> Privates, | |||
2051 | QualType ReductionArrayTy, | |||
2052 | SourceLocation Loc) { | |||
2053 | ASTContext &C = CGM.getContext(); | |||
2054 | llvm::Module &M = CGM.getModule(); | |||
2055 | ||||
2056 | // ReduceList: thread local Reduce list. | |||
2057 | // At the stage of the computation when this function is called, partially | |||
2058 | // aggregated values reside in the first lane of every active warp. | |||
2059 | ImplicitParamDecl ReduceListArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, | |||
2060 | C.VoidPtrTy, ImplicitParamDecl::Other); | |||
2061 | // NumWarps: number of warps active in the parallel region. This could | |||
2062 | // be smaller than 32 (max warps in a CTA) for partial block reduction. | |||
2063 | ImplicitParamDecl NumWarpsArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, | |||
2064 | C.getIntTypeForBitwidth(32, /* Signed */ true), | |||
2065 | ImplicitParamDecl::Other); | |||
2066 | FunctionArgList Args; | |||
2067 | Args.push_back(&ReduceListArg); | |||
2068 | Args.push_back(&NumWarpsArg); | |||
2069 | ||||
2070 | const CGFunctionInfo &CGFI = | |||
2071 | CGM.getTypes().arrangeBuiltinFunctionDeclaration(C.VoidTy, Args); | |||
2072 | auto *Fn = llvm::Function::Create(CGM.getTypes().GetFunctionType(CGFI), | |||
2073 | llvm::GlobalValue::InternalLinkage, | |||
2074 | "_omp_reduction_inter_warp_copy_func", &M); | |||
2075 | CGM.SetInternalFunctionAttributes(GlobalDecl(), Fn, CGFI); | |||
2076 | Fn->setDoesNotRecurse(); | |||
2077 | CodeGenFunction CGF(CGM); | |||
2078 | CGF.StartFunction(GlobalDecl(), C.VoidTy, Fn, CGFI, Args, Loc, Loc); | |||
2079 | ||||
2080 | CGBuilderTy &Bld = CGF.Builder; | |||
2081 | ||||
2082 | // This array is used as a medium to transfer, one reduce element at a time, | |||
2083 | // the data from the first lane of every warp to lanes in the first warp | |||
2084 | // in order to perform the final step of a reduction in a parallel region | |||
2085 | // (reduction across warps). The array is placed in NVPTX __shared__ memory | |||
2086 | // for reduced latency, as well as to have a distinct copy for concurrently | |||
2087 | // executing target regions. The array is declared with common linkage so | |||
2088 | // as to be shared across compilation units. | |||
2089 | StringRef TransferMediumName = | |||
2090 | "__openmp_nvptx_data_transfer_temporary_storage"; | |||
2091 | llvm::GlobalVariable *TransferMedium = | |||
2092 | M.getGlobalVariable(TransferMediumName); | |||
2093 | unsigned WarpSize = CGF.getTarget().getGridValue().GV_Warp_Size; | |||
2094 | if (!TransferMedium) { | |||
2095 | auto *Ty = llvm::ArrayType::get(CGM.Int32Ty, WarpSize); | |||
2096 | unsigned SharedAddressSpace = C.getTargetAddressSpace(LangAS::cuda_shared); | |||
2097 | TransferMedium = new llvm::GlobalVariable( | |||
2098 | M, Ty, /*isConstant=*/false, llvm::GlobalVariable::WeakAnyLinkage, | |||
2099 | llvm::UndefValue::get(Ty), TransferMediumName, | |||
2100 | /*InsertBefore=*/nullptr, llvm::GlobalVariable::NotThreadLocal, | |||
2101 | SharedAddressSpace); | |||
2102 | CGM.addCompilerUsedGlobal(TransferMedium); | |||
2103 | } | |||
2104 | ||||
2105 | auto &RT = static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime()); | |||
2106 | // Get the CUDA thread id of the current OpenMP thread on the GPU. | |||
2107 | llvm::Value *ThreadID = RT.getGPUThreadID(CGF); | |||
2108 | // nvptx_lane_id = nvptx_id % warpsize | |||
2109 | llvm::Value *LaneID = getNVPTXLaneID(CGF); | |||
2110 | // nvptx_warp_id = nvptx_id / warpsize | |||
2111 | llvm::Value *WarpID = getNVPTXWarpID(CGF); | |||
2112 | ||||
2113 | Address AddrReduceListArg = CGF.GetAddrOfLocalVar(&ReduceListArg); | |||
2114 | Address LocalReduceList( | |||
2115 | Bld.CreatePointerBitCastOrAddrSpaceCast( | |||
2116 | CGF.EmitLoadOfScalar( | |||
2117 | AddrReduceListArg, /*Volatile=*/false, C.VoidPtrTy, Loc, | |||
2118 | LValueBaseInfo(AlignmentSource::Type), TBAAAccessInfo()), | |||
2119 | CGF.ConvertTypeForMem(ReductionArrayTy)->getPointerTo()), | |||
2120 | CGF.getPointerAlign()); | |||
2121 | ||||
2122 | unsigned Idx = 0; | |||
2123 | for (const Expr *Private : Privates) { | |||
2124 | // | |||
2125 | // Warp master copies reduce element to transfer medium in __shared__ | |||
2126 | // memory. | |||
2127 | // | |||
2128 | unsigned RealTySize = | |||
2129 | C.getTypeSizeInChars(Private->getType()) | |||
2130 | .alignTo(C.getTypeAlignInChars(Private->getType())) | |||
2131 | .getQuantity(); | |||
2132 | for (unsigned TySize = 4; TySize > 0 && RealTySize > 0; TySize /=2) { | |||
2133 | unsigned NumIters = RealTySize / TySize; | |||
2134 | if (NumIters == 0) | |||
2135 | continue; | |||
2136 | QualType CType = C.getIntTypeForBitwidth( | |||
2137 | C.toBits(CharUnits::fromQuantity(TySize)), /*Signed=*/1); | |||
2138 | llvm::Type *CopyType = CGF.ConvertTypeForMem(CType); | |||
2139 | CharUnits Align = CharUnits::fromQuantity(TySize); | |||
2140 | llvm::Value *Cnt = nullptr; | |||
2141 | Address CntAddr = Address::invalid(); | |||
2142 | llvm::BasicBlock *PrecondBB = nullptr; | |||
2143 | llvm::BasicBlock *ExitBB = nullptr; | |||
2144 | if (NumIters > 1) { | |||
2145 | CntAddr = CGF.CreateMemTemp(C.IntTy, ".cnt.addr"); | |||
2146 | CGF.EmitStoreOfScalar(llvm::Constant::getNullValue(CGM.IntTy), CntAddr, | |||
2147 | /*Volatile=*/false, C.IntTy); | |||
2148 | PrecondBB = CGF.createBasicBlock("precond"); | |||
2149 | ExitBB = CGF.createBasicBlock("exit"); | |||
2150 | llvm::BasicBlock *BodyBB = CGF.createBasicBlock("body"); | |||
2151 | // There is no need to emit line number for unconditional branch. | |||
2152 | (void)ApplyDebugLocation::CreateEmpty(CGF); | |||
2153 | CGF.EmitBlock(PrecondBB); | |||
2154 | Cnt = CGF.EmitLoadOfScalar(CntAddr, /*Volatile=*/false, C.IntTy, Loc); | |||
2155 | llvm::Value *Cmp = | |||
2156 | Bld.CreateICmpULT(Cnt, llvm::ConstantInt::get(CGM.IntTy, NumIters)); | |||
2157 | Bld.CreateCondBr(Cmp, BodyBB, ExitBB); | |||
2158 | CGF.EmitBlock(BodyBB); | |||
2159 | } | |||
2160 | // kmpc_barrier. | |||
2161 | CGM.getOpenMPRuntime().emitBarrierCall(CGF, Loc, OMPD_unknown, | |||
2162 | /*EmitChecks=*/false, | |||
2163 | /*ForceSimpleCall=*/true); | |||
2164 | llvm::BasicBlock *ThenBB = CGF.createBasicBlock("then"); | |||
2165 | llvm::BasicBlock *ElseBB = CGF.createBasicBlock("else"); | |||
2166 | llvm::BasicBlock *MergeBB = CGF.createBasicBlock("ifcont"); | |||
2167 | ||||
2168 | // if (lane_id == 0) | |||
2169 | llvm::Value *IsWarpMaster = Bld.CreateIsNull(LaneID, "warp_master"); | |||
2170 | Bld.CreateCondBr(IsWarpMaster, ThenBB, ElseBB); | |||
2171 | CGF.EmitBlock(ThenBB); | |||
2172 | ||||
2173 | // Reduce element = LocalReduceList[i] | |||
2174 | Address ElemPtrPtrAddr = Bld.CreateConstArrayGEP(LocalReduceList, Idx); | |||
2175 | llvm::Value *ElemPtrPtr = CGF.EmitLoadOfScalar( | |||
2176 | ElemPtrPtrAddr, /*Volatile=*/false, C.VoidPtrTy, SourceLocation()); | |||
2177 | // elemptr = ((CopyType*)(elemptrptr)) + I | |||
2178 | Address ElemPtr = Address(ElemPtrPtr, Align); | |||
2179 | ElemPtr = Bld.CreateElementBitCast(ElemPtr, CopyType); | |||
2180 | if (NumIters > 1) { | |||
2181 | ElemPtr = Address(Bld.CreateGEP(ElemPtr.getElementType(), | |||
2182 | ElemPtr.getPointer(), Cnt), | |||
2183 | ElemPtr.getAlignment()); | |||
2184 | } | |||
2185 | ||||
2186 | // Get pointer to location in transfer medium. | |||
2187 | // MediumPtr = &medium[warp_id] | |||
2188 | llvm::Value *MediumPtrVal = Bld.CreateInBoundsGEP( | |||
2189 | TransferMedium->getValueType(), TransferMedium, | |||
2190 | {llvm::Constant::getNullValue(CGM.Int64Ty), WarpID}); | |||
2191 | Address MediumPtr(MediumPtrVal, Align); | |||
2192 | // Casting to actual data type. | |||
2193 | // MediumPtr = (CopyType*)MediumPtrAddr; | |||
2194 | MediumPtr = Bld.CreateElementBitCast(MediumPtr, CopyType); | |||
2195 | ||||
2196 | // elem = *elemptr | |||
2197 | //*MediumPtr = elem | |||
2198 | llvm::Value *Elem = CGF.EmitLoadOfScalar( | |||
2199 | ElemPtr, /*Volatile=*/false, CType, Loc, | |||
2200 | LValueBaseInfo(AlignmentSource::Type), TBAAAccessInfo()); | |||
2201 | // Store the source element value to the dest element address. | |||
2202 | CGF.EmitStoreOfScalar(Elem, MediumPtr, /*Volatile=*/true, CType, | |||
2203 | LValueBaseInfo(AlignmentSource::Type), | |||
2204 | TBAAAccessInfo()); | |||
2205 | ||||
2206 | Bld.CreateBr(MergeBB); | |||
2207 | ||||
2208 | CGF.EmitBlock(ElseBB); | |||
2209 | Bld.CreateBr(MergeBB); | |||
2210 | ||||
2211 | CGF.EmitBlock(MergeBB); | |||
2212 | ||||
2213 | // kmpc_barrier. | |||
2214 | CGM.getOpenMPRuntime().emitBarrierCall(CGF, Loc, OMPD_unknown, | |||
2215 | /*EmitChecks=*/false, | |||
2216 | /*ForceSimpleCall=*/true); | |||
2217 | ||||
2218 | // | |||
2219 | // Warp 0 copies reduce element from transfer medium. | |||
2220 | // | |||
2221 | llvm::BasicBlock *W0ThenBB = CGF.createBasicBlock("then"); | |||
2222 | llvm::BasicBlock *W0ElseBB = CGF.createBasicBlock("else"); | |||
2223 | llvm::BasicBlock *W0MergeBB = CGF.createBasicBlock("ifcont"); | |||
2224 | ||||
2225 | Address AddrNumWarpsArg = CGF.GetAddrOfLocalVar(&NumWarpsArg); | |||
2226 | llvm::Value *NumWarpsVal = CGF.EmitLoadOfScalar( | |||
2227 | AddrNumWarpsArg, /*Volatile=*/false, C.IntTy, Loc); | |||
2228 | ||||
2229 | // Up to 32 threads in warp 0 are active. | |||
2230 | llvm::Value *IsActiveThread = | |||
2231 | Bld.CreateICmpULT(ThreadID, NumWarpsVal, "is_active_thread"); | |||
2232 | Bld.CreateCondBr(IsActiveThread, W0ThenBB, W0ElseBB); | |||
2233 | ||||
2234 | CGF.EmitBlock(W0ThenBB); | |||
2235 | ||||
2236 | // SrcMediumPtr = &medium[tid] | |||
2237 | llvm::Value *SrcMediumPtrVal = Bld.CreateInBoundsGEP( | |||
2238 | TransferMedium->getValueType(), TransferMedium, | |||
2239 | {llvm::Constant::getNullValue(CGM.Int64Ty), ThreadID}); | |||
2240 | Address SrcMediumPtr(SrcMediumPtrVal, Align); | |||
2241 | // SrcMediumVal = *SrcMediumPtr; | |||
2242 | SrcMediumPtr = Bld.CreateElementBitCast(SrcMediumPtr, CopyType); | |||
2243 | ||||
2244 | // TargetElemPtr = (CopyType*)(SrcDataAddr[i]) + I | |||
2245 | Address TargetElemPtrPtr = Bld.CreateConstArrayGEP(LocalReduceList, Idx); | |||
2246 | llvm::Value *TargetElemPtrVal = CGF.EmitLoadOfScalar( | |||
2247 | TargetElemPtrPtr, /*Volatile=*/false, C.VoidPtrTy, Loc); | |||
2248 | Address TargetElemPtr = Address(TargetElemPtrVal, Align); | |||
2249 | TargetElemPtr = Bld.CreateElementBitCast(TargetElemPtr, CopyType); | |||
2250 | if (NumIters > 1) { | |||
2251 | TargetElemPtr = Address(Bld.CreateGEP(TargetElemPtr.getElementType(), | |||
2252 | TargetElemPtr.getPointer(), Cnt), | |||
2253 | TargetElemPtr.getAlignment()); | |||
2254 | } | |||
2255 | ||||
2256 | // *TargetElemPtr = SrcMediumVal; | |||
2257 | llvm::Value *SrcMediumValue = | |||
2258 | CGF.EmitLoadOfScalar(SrcMediumPtr, /*Volatile=*/true, CType, Loc); | |||
2259 | CGF.EmitStoreOfScalar(SrcMediumValue, TargetElemPtr, /*Volatile=*/false, | |||
2260 | CType); | |||
2261 | Bld.CreateBr(W0MergeBB); | |||
2262 | ||||
2263 | CGF.EmitBlock(W0ElseBB); | |||
2264 | Bld.CreateBr(W0MergeBB); | |||
2265 | ||||
2266 | CGF.EmitBlock(W0MergeBB); | |||
2267 | ||||
2268 | if (NumIters > 1) { | |||
2269 | Cnt = Bld.CreateNSWAdd(Cnt, llvm::ConstantInt::get(CGM.IntTy, /*V=*/1)); | |||
2270 | CGF.EmitStoreOfScalar(Cnt, CntAddr, /*Volatile=*/false, C.IntTy); | |||
2271 | CGF.EmitBranch(PrecondBB); | |||
2272 | (void)ApplyDebugLocation::CreateEmpty(CGF); | |||
2273 | CGF.EmitBlock(ExitBB); | |||
2274 | } | |||
2275 | RealTySize %= TySize; | |||
2276 | } | |||
2277 | ++Idx; | |||
2278 | } | |||
2279 | ||||
2280 | CGF.FinishFunction(); | |||
2281 | return Fn; | |||
2282 | } | |||
2283 | ||||
2284 | /// Emit a helper that reduces data across two OpenMP threads (lanes) | |||
2285 | /// in the same warp. It uses shuffle instructions to copy over data from | |||
2286 | /// a remote lane's stack. The reduction algorithm performed is specified | |||
2287 | /// by the fourth parameter. | |||
2288 | /// | |||
2289 | /// Algorithm Versions. | |||
2290 | /// Full Warp Reduce (argument value 0): | |||
2291 | /// This algorithm assumes that all 32 lanes are active and gathers | |||
2292 | /// data from these 32 lanes, producing a single resultant value. | |||
2293 | /// Contiguous Partial Warp Reduce (argument value 1): | |||
2294 | /// This algorithm assumes that only a *contiguous* subset of lanes | |||
2295 | /// are active. This happens for the last warp in a parallel region | |||
2296 | /// when the user specified num_threads is not an integer multiple of | |||
2297 | /// 32. This contiguous subset always starts with the zeroth lane. | |||
2298 | /// Partial Warp Reduce (argument value 2): | |||
2299 | /// This algorithm gathers data from any number of lanes at any position. | |||
2300 | /// All reduced values are stored in the lowest possible lane. The set | |||
2301 | /// of problems every algorithm addresses is a super set of those | |||
2302 | /// addressable by algorithms with a lower version number. Overhead | |||
2303 | /// increases as algorithm version increases. | |||
2304 | /// | |||
2305 | /// Terminology | |||
2306 | /// Reduce element: | |||
2307 | /// Reduce element refers to the individual data field with primitive | |||
2308 | /// data types to be combined and reduced across threads. | |||
2309 | /// Reduce list: | |||
2310 | /// Reduce list refers to a collection of local, thread-private | |||
2311 | /// reduce elements. | |||
2312 | /// Remote Reduce list: | |||
2313 | /// Remote Reduce list refers to a collection of remote (relative to | |||
2314 | /// the current thread) reduce elements. | |||
2315 | /// | |||
2316 | /// We distinguish between three states of threads that are important to | |||
2317 | /// the implementation of this function. | |||
2318 | /// Alive threads: | |||
2319 | /// Threads in a warp executing the SIMT instruction, as distinguished from | |||
2320 | /// threads that are inactive due to divergent control flow. | |||
2321 | /// Active threads: | |||
2322 | /// The minimal set of threads that has to be alive upon entry to this | |||
2323 | /// function. The computation is correct iff active threads are alive. | |||
2324 | /// Some threads are alive but they are not active because they do not | |||
2325 | /// contribute to the computation in any useful manner. Turning them off | |||
2326 | /// may introduce control flow overheads without any tangible benefits. | |||
2327 | /// Effective threads: | |||
2328 | /// In order to comply with the argument requirements of the shuffle | |||
2329 | /// function, we must keep all lanes holding data alive. But at most | |||
2330 | /// half of them perform value aggregation; we refer to this half of | |||
2331 | /// threads as effective. The other half is simply handing off their | |||
2332 | /// data. | |||
2333 | /// | |||
2334 | /// Procedure | |||
2335 | /// Value shuffle: | |||
2336 | /// In this step active threads transfer data from higher lane positions | |||
2337 | /// in the warp to lower lane positions, creating Remote Reduce list. | |||
2338 | /// Value aggregation: | |||
2339 | /// In this step, effective threads combine their thread local Reduce list | |||
2340 | /// with Remote Reduce list and store the result in the thread local | |||
2341 | /// Reduce list. | |||
2342 | /// Value copy: | |||
2343 | /// In this step, we deal with the assumption made by algorithm 2 | |||
2344 | /// (i.e. contiguity assumption). When we have an odd number of lanes | |||
2345 | /// active, say 2k+1, only k threads will be effective and therefore k | |||
2346 | /// new values will be produced. However, the Reduce list owned by the | |||
2347 | /// (2k+1)th thread is ignored in the value aggregation. Therefore | |||
2348 | /// we copy the Reduce list from the (2k+1)th lane to (k+1)th lane so | |||
2349 | /// that the contiguity assumption still holds. | |||
2350 | static llvm::Function *emitShuffleAndReduceFunction( | |||
2351 | CodeGenModule &CGM, ArrayRef<const Expr *> Privates, | |||
2352 | QualType ReductionArrayTy, llvm::Function *ReduceFn, SourceLocation Loc) { | |||
2353 | ASTContext &C = CGM.getContext(); | |||
2354 | ||||
2355 | // Thread local Reduce list used to host the values of data to be reduced. | |||
2356 | ImplicitParamDecl ReduceListArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, | |||
2357 | C.VoidPtrTy, ImplicitParamDecl::Other); | |||
2358 | // Current lane id; could be logical. | |||
2359 | ImplicitParamDecl LaneIDArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, C.ShortTy, | |||
2360 | ImplicitParamDecl::Other); | |||
2361 | // Offset of the remote source lane relative to the current lane. | |||
2362 | ImplicitParamDecl RemoteLaneOffsetArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, | |||
2363 | C.ShortTy, ImplicitParamDecl::Other); | |||
2364 | // Algorithm version. This is expected to be known at compile time. | |||
2365 | ImplicitParamDecl AlgoVerArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, | |||
2366 | C.ShortTy, ImplicitParamDecl::Other); | |||
2367 | FunctionArgList Args; | |||
2368 | Args.push_back(&ReduceListArg); | |||
2369 | Args.push_back(&LaneIDArg); | |||
2370 | Args.push_back(&RemoteLaneOffsetArg); | |||
2371 | Args.push_back(&AlgoVerArg); | |||
2372 | ||||
2373 | const CGFunctionInfo &CGFI = | |||
2374 | CGM.getTypes().arrangeBuiltinFunctionDeclaration(C.VoidTy, Args); | |||
2375 | auto *Fn = llvm::Function::Create( | |||
2376 | CGM.getTypes().GetFunctionType(CGFI), llvm::GlobalValue::InternalLinkage, | |||
2377 | "_omp_reduction_shuffle_and_reduce_func", &CGM.getModule()); | |||
2378 | CGM.SetInternalFunctionAttributes(GlobalDecl(), Fn, CGFI); | |||
2379 | Fn->setDoesNotRecurse(); | |||
2380 | ||||
2381 | CodeGenFunction CGF(CGM); | |||
2382 | CGF.StartFunction(GlobalDecl(), C.VoidTy, Fn, CGFI, Args, Loc, Loc); | |||
2383 | ||||
2384 | CGBuilderTy &Bld = CGF.Builder; | |||
2385 | ||||
2386 | Address AddrReduceListArg = CGF.GetAddrOfLocalVar(&ReduceListArg); | |||
2387 | Address LocalReduceList( | |||
2388 | Bld.CreatePointerBitCastOrAddrSpaceCast( | |||
2389 | CGF.EmitLoadOfScalar(AddrReduceListArg, /*Volatile=*/false, | |||
2390 | C.VoidPtrTy, SourceLocation()), | |||
2391 | CGF.ConvertTypeForMem(ReductionArrayTy)->getPointerTo()), | |||
2392 | CGF.getPointerAlign()); | |||
2393 | ||||
2394 | Address AddrLaneIDArg = CGF.GetAddrOfLocalVar(&LaneIDArg); | |||
2395 | llvm::Value *LaneIDArgVal = CGF.EmitLoadOfScalar( | |||
2396 | AddrLaneIDArg, /*Volatile=*/false, C.ShortTy, SourceLocation()); | |||
2397 | ||||
2398 | Address AddrRemoteLaneOffsetArg = CGF.GetAddrOfLocalVar(&RemoteLaneOffsetArg); | |||
2399 | llvm::Value *RemoteLaneOffsetArgVal = CGF.EmitLoadOfScalar( | |||
2400 | AddrRemoteLaneOffsetArg, /*Volatile=*/false, C.ShortTy, SourceLocation()); | |||
2401 | ||||
2402 | Address AddrAlgoVerArg = CGF.GetAddrOfLocalVar(&AlgoVerArg); | |||
2403 | llvm::Value *AlgoVerArgVal = CGF.EmitLoadOfScalar( | |||
2404 | AddrAlgoVerArg, /*Volatile=*/false, C.ShortTy, SourceLocation()); | |||
2405 | ||||
2406 | // Create a local thread-private variable to host the Reduce list | |||
2407 | // from a remote lane. | |||
2408 | Address RemoteReduceList = | |||
2409 | CGF.CreateMemTemp(ReductionArrayTy, ".omp.reduction.remote_reduce_list"); | |||
2410 | ||||
2411 | // This loop iterates through the list of reduce elements and copies, | |||
2412 | // element by element, from a remote lane in the warp to RemoteReduceList, | |||
2413 | // hosted on the thread's stack. | |||
2414 | emitReductionListCopy(RemoteLaneToThread, CGF, ReductionArrayTy, Privates, | |||
2415 | LocalReduceList, RemoteReduceList, | |||
2416 | {/*RemoteLaneOffset=*/RemoteLaneOffsetArgVal, | |||
2417 | /*ScratchpadIndex=*/nullptr, | |||
2418 | /*ScratchpadWidth=*/nullptr}); | |||
2419 | ||||
2420 | // The actions to be performed on the Remote Reduce list is dependent | |||
2421 | // on the algorithm version. | |||
2422 | // | |||
2423 | // if (AlgoVer==0) || (AlgoVer==1 && (LaneId < Offset)) || (AlgoVer==2 && | |||
2424 | // LaneId % 2 == 0 && Offset > 0): | |||
2425 | // do the reduction value aggregation | |||
2426 | // | |||
2427 | // The thread local variable Reduce list is mutated in place to host the | |||
2428 | // reduced data, which is the aggregated value produced from local and | |||
2429 | // remote lanes. | |||
2430 | // | |||
2431 | // Note that AlgoVer is expected to be a constant integer known at compile | |||
2432 | // time. | |||
2433 | // When AlgoVer==0, the first conjunction evaluates to true, making | |||
2434 | // the entire predicate true during compile time. | |||
2435 | // When AlgoVer==1, the second conjunction has only the second part to be | |||
2436 | // evaluated during runtime. Other conjunctions evaluates to false | |||
2437 | // during compile time. | |||
2438 | // When AlgoVer==2, the third conjunction has only the second part to be | |||
2439 | // evaluated during runtime. Other conjunctions evaluates to false | |||
2440 | // during compile time. | |||
2441 | llvm::Value *CondAlgo0 = Bld.CreateIsNull(AlgoVerArgVal); | |||
2442 | ||||
2443 | llvm::Value *Algo1 = Bld.CreateICmpEQ(AlgoVerArgVal, Bld.getInt16(1)); | |||
2444 | llvm::Value *CondAlgo1 = Bld.CreateAnd( | |||
2445 | Algo1, Bld.CreateICmpULT(LaneIDArgVal, RemoteLaneOffsetArgVal)); | |||
2446 | ||||
2447 | llvm::Value *Algo2 = Bld.CreateICmpEQ(AlgoVerArgVal, Bld.getInt16(2)); | |||
2448 | llvm::Value *CondAlgo2 = Bld.CreateAnd( | |||
2449 | Algo2, Bld.CreateIsNull(Bld.CreateAnd(LaneIDArgVal, Bld.getInt16(1)))); | |||
2450 | CondAlgo2 = Bld.CreateAnd( | |||
2451 | CondAlgo2, Bld.CreateICmpSGT(RemoteLaneOffsetArgVal, Bld.getInt16(0))); | |||
2452 | ||||
2453 | llvm::Value *CondReduce = Bld.CreateOr(CondAlgo0, CondAlgo1); | |||
2454 | CondReduce = Bld.CreateOr(CondReduce, CondAlgo2); | |||
2455 | ||||
2456 | llvm::BasicBlock *ThenBB = CGF.createBasicBlock("then"); | |||
2457 | llvm::BasicBlock *ElseBB = CGF.createBasicBlock("else"); | |||
2458 | llvm::BasicBlock *MergeBB = CGF.createBasicBlock("ifcont"); | |||
2459 | Bld.CreateCondBr(CondReduce, ThenBB, ElseBB); | |||
2460 | ||||
2461 | CGF.EmitBlock(ThenBB); | |||
2462 | // reduce_function(LocalReduceList, RemoteReduceList) | |||
2463 | llvm::Value *LocalReduceListPtr = Bld.CreatePointerBitCastOrAddrSpaceCast( | |||
2464 | LocalReduceList.getPointer(), CGF.VoidPtrTy); | |||
2465 | llvm::Value *RemoteReduceListPtr = Bld.CreatePointerBitCastOrAddrSpaceCast( | |||
2466 | RemoteReduceList.getPointer(), CGF.VoidPtrTy); | |||
2467 | CGM.getOpenMPRuntime().emitOutlinedFunctionCall( | |||
2468 | CGF, Loc, ReduceFn, {LocalReduceListPtr, RemoteReduceListPtr}); | |||
2469 | Bld.CreateBr(MergeBB); | |||
2470 | ||||
2471 | CGF.EmitBlock(ElseBB); | |||
2472 | Bld.CreateBr(MergeBB); | |||
2473 | ||||
2474 | CGF.EmitBlock(MergeBB); | |||
2475 | ||||
2476 | // if (AlgoVer==1 && (LaneId >= Offset)) copy Remote Reduce list to local | |||
2477 | // Reduce list. | |||
2478 | Algo1 = Bld.CreateICmpEQ(AlgoVerArgVal, Bld.getInt16(1)); | |||
2479 | llvm::Value *CondCopy = Bld.CreateAnd( | |||
2480 | Algo1, Bld.CreateICmpUGE(LaneIDArgVal, RemoteLaneOffsetArgVal)); | |||
2481 | ||||
2482 | llvm::BasicBlock *CpyThenBB = CGF.createBasicBlock("then"); | |||
2483 | llvm::BasicBlock *CpyElseBB = CGF.createBasicBlock("else"); | |||
2484 | llvm::BasicBlock *CpyMergeBB = CGF.createBasicBlock("ifcont"); | |||
2485 | Bld.CreateCondBr(CondCopy, CpyThenBB, CpyElseBB); | |||
2486 | ||||
2487 | CGF.EmitBlock(CpyThenBB); | |||
2488 | emitReductionListCopy(ThreadCopy, CGF, ReductionArrayTy, Privates, | |||
2489 | RemoteReduceList, LocalReduceList); | |||
2490 | Bld.CreateBr(CpyMergeBB); | |||
2491 | ||||
2492 | CGF.EmitBlock(CpyElseBB); | |||
2493 | Bld.CreateBr(CpyMergeBB); | |||
2494 | ||||
2495 | CGF.EmitBlock(CpyMergeBB); | |||
2496 | ||||
2497 | CGF.FinishFunction(); | |||
2498 | return Fn; | |||
2499 | } | |||
2500 | ||||
2501 | /// This function emits a helper that copies all the reduction variables from | |||
2502 | /// the team into the provided global buffer for the reduction variables. | |||
2503 | /// | |||
2504 | /// void list_to_global_copy_func(void *buffer, int Idx, void *reduce_data) | |||
2505 | /// For all data entries D in reduce_data: | |||
2506 | /// Copy local D to buffer.D[Idx] | |||
2507 | static llvm::Value *emitListToGlobalCopyFunction( | |||
2508 | CodeGenModule &CGM, ArrayRef<const Expr *> Privates, | |||
2509 | QualType ReductionArrayTy, SourceLocation Loc, | |||
2510 | const RecordDecl *TeamReductionRec, | |||
2511 | const llvm::SmallDenseMap<const ValueDecl *, const FieldDecl *> | |||
2512 | &VarFieldMap) { | |||
2513 | ASTContext &C = CGM.getContext(); | |||
2514 | ||||
2515 | // Buffer: global reduction buffer. | |||
2516 | ImplicitParamDecl BufferArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, | |||
2517 | C.VoidPtrTy, ImplicitParamDecl::Other); | |||
2518 | // Idx: index of the buffer. | |||
2519 | ImplicitParamDecl IdxArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, C.IntTy, | |||
2520 | ImplicitParamDecl::Other); | |||
2521 | // ReduceList: thread local Reduce list. | |||
2522 | ImplicitParamDecl ReduceListArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, | |||
2523 | C.VoidPtrTy, ImplicitParamDecl::Other); | |||
2524 | FunctionArgList Args; | |||
2525 | Args.push_back(&BufferArg); | |||
2526 | Args.push_back(&IdxArg); | |||
2527 | Args.push_back(&ReduceListArg); | |||
2528 | ||||
2529 | const CGFunctionInfo &CGFI = | |||
2530 | CGM.getTypes().arrangeBuiltinFunctionDeclaration(C.VoidTy, Args); | |||
2531 | auto *Fn = llvm::Function::Create( | |||
2532 | CGM.getTypes().GetFunctionType(CGFI), llvm::GlobalValue::InternalLinkage, | |||
2533 | "_omp_reduction_list_to_global_copy_func", &CGM.getModule()); | |||
2534 | CGM.SetInternalFunctionAttributes(GlobalDecl(), Fn, CGFI); | |||
2535 | Fn->setDoesNotRecurse(); | |||
2536 | CodeGenFunction CGF(CGM); | |||
2537 | CGF.StartFunction(GlobalDecl(), C.VoidTy, Fn, CGFI, Args, Loc, Loc); | |||
2538 | ||||
2539 | CGBuilderTy &Bld = CGF.Builder; | |||
2540 | ||||
2541 | Address AddrReduceListArg = CGF.GetAddrOfLocalVar(&ReduceListArg); | |||
2542 | Address AddrBufferArg = CGF.GetAddrOfLocalVar(&BufferArg); | |||
2543 | Address LocalReduceList( | |||
2544 | Bld.CreatePointerBitCastOrAddrSpaceCast( | |||
2545 | CGF.EmitLoadOfScalar(AddrReduceListArg, /*Volatile=*/false, | |||
2546 | C.VoidPtrTy, Loc), | |||
2547 | CGF.ConvertTypeForMem(ReductionArrayTy)->getPointerTo()), | |||
2548 | CGF.getPointerAlign()); | |||
2549 | QualType StaticTy = C.getRecordType(TeamReductionRec); | |||
2550 | llvm::Type *LLVMReductionsBufferTy = | |||
2551 | CGM.getTypes().ConvertTypeForMem(StaticTy); | |||
2552 | llvm::Value *BufferArrPtr = Bld.CreatePointerBitCastOrAddrSpaceCast( | |||
2553 | CGF.EmitLoadOfScalar(AddrBufferArg, /*Volatile=*/false, C.VoidPtrTy, Loc), | |||
2554 | LLVMReductionsBufferTy->getPointerTo()); | |||
2555 | llvm::Value *Idxs[] = {llvm::ConstantInt::getNullValue(CGF.Int32Ty), | |||
2556 | CGF.EmitLoadOfScalar(CGF.GetAddrOfLocalVar(&IdxArg), | |||
2557 | /*Volatile=*/false, C.IntTy, | |||
2558 | Loc)}; | |||
2559 | unsigned Idx = 0; | |||
2560 | for (const Expr *Private : Privates) { | |||
2561 | // Reduce element = LocalReduceList[i] | |||
2562 | Address ElemPtrPtrAddr = Bld.CreateConstArrayGEP(LocalReduceList, Idx); | |||
2563 | llvm::Value *ElemPtrPtr = CGF.EmitLoadOfScalar( | |||
2564 | ElemPtrPtrAddr, /*Volatile=*/false, C.VoidPtrTy, SourceLocation()); | |||
2565 | // elemptr = ((CopyType*)(elemptrptr)) + I | |||
2566 | ElemPtrPtr = Bld.CreatePointerBitCastOrAddrSpaceCast( | |||
2567 | ElemPtrPtr, CGF.ConvertTypeForMem(Private->getType())->getPointerTo()); | |||
2568 | Address ElemPtr = | |||
2569 | Address(ElemPtrPtr, C.getTypeAlignInChars(Private->getType())); | |||
2570 | const ValueDecl *VD = cast<DeclRefExpr>(Private)->getDecl(); | |||
2571 | // Global = Buffer.VD[Idx]; | |||
2572 | const FieldDecl *FD = VarFieldMap.lookup(VD); | |||
2573 | LValue GlobLVal = CGF.EmitLValueForField( | |||
2574 | CGF.MakeNaturalAlignAddrLValue(BufferArrPtr, StaticTy), FD); | |||
2575 | Address GlobAddr = GlobLVal.getAddress(CGF); | |||
2576 | llvm::Value *BufferPtr = Bld.CreateInBoundsGEP( | |||
2577 | GlobAddr.getElementType(), GlobAddr.getPointer(), Idxs); | |||
2578 | GlobLVal.setAddress(Address(BufferPtr, GlobAddr.getAlignment())); | |||
2579 | switch (CGF.getEvaluationKind(Private->getType())) { | |||
2580 | case TEK_Scalar: { | |||
2581 | llvm::Value *V = CGF.EmitLoadOfScalar( | |||
2582 | ElemPtr, /*Volatile=*/false, Private->getType(), Loc, | |||
2583 | LValueBaseInfo(AlignmentSource::Type), TBAAAccessInfo()); | |||
2584 | CGF.EmitStoreOfScalar(V, GlobLVal); | |||
2585 | break; | |||
2586 | } | |||
2587 | case TEK_Complex: { | |||
2588 | CodeGenFunction::ComplexPairTy V = CGF.EmitLoadOfComplex( | |||
2589 | CGF.MakeAddrLValue(ElemPtr, Private->getType()), Loc); | |||
2590 | CGF.EmitStoreOfComplex(V, GlobLVal, /*isInit=*/false); | |||
2591 | break; | |||
2592 | } | |||
2593 | case TEK_Aggregate: | |||
2594 | CGF.EmitAggregateCopy(GlobLVal, | |||
2595 | CGF.MakeAddrLValue(ElemPtr, Private->getType()), | |||
2596 | Private->getType(), AggValueSlot::DoesNotOverlap); | |||
2597 | break; | |||
2598 | } | |||
2599 | ++Idx; | |||
2600 | } | |||
2601 | ||||
2602 | CGF.FinishFunction(); | |||
2603 | return Fn; | |||
2604 | } | |||
2605 | ||||
2606 | /// This function emits a helper that reduces all the reduction variables from | |||
2607 | /// the team into the provided global buffer for the reduction variables. | |||
2608 | /// | |||
2609 | /// void list_to_global_reduce_func(void *buffer, int Idx, void *reduce_data) | |||
2610 | /// void *GlobPtrs[]; | |||
2611 | /// GlobPtrs[0] = (void*)&buffer.D0[Idx]; | |||
2612 | /// ... | |||
2613 | /// GlobPtrs[N] = (void*)&buffer.DN[Idx]; | |||
2614 | /// reduce_function(GlobPtrs, reduce_data); | |||
2615 | static llvm::Value *emitListToGlobalReduceFunction( | |||
2616 | CodeGenModule &CGM, ArrayRef<const Expr *> Privates, | |||
2617 | QualType ReductionArrayTy, SourceLocation Loc, | |||
2618 | const RecordDecl *TeamReductionRec, | |||
2619 | const llvm::SmallDenseMap<const ValueDecl *, const FieldDecl *> | |||
2620 | &VarFieldMap, | |||
2621 | llvm::Function *ReduceFn) { | |||
2622 | ASTContext &C = CGM.getContext(); | |||
2623 | ||||
2624 | // Buffer: global reduction buffer. | |||
2625 | ImplicitParamDecl BufferArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, | |||
2626 | C.VoidPtrTy, ImplicitParamDecl::Other); | |||
2627 | // Idx: index of the buffer. | |||
2628 | ImplicitParamDecl IdxArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, C.IntTy, | |||
2629 | ImplicitParamDecl::Other); | |||
2630 | // ReduceList: thread local Reduce list. | |||
2631 | ImplicitParamDecl ReduceListArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, | |||
2632 | C.VoidPtrTy, ImplicitParamDecl::Other); | |||
2633 | FunctionArgList Args; | |||
2634 | Args.push_back(&BufferArg); | |||
2635 | Args.push_back(&IdxArg); | |||
2636 | Args.push_back(&ReduceListArg); | |||
2637 | ||||
2638 | const CGFunctionInfo &CGFI = | |||
2639 | CGM.getTypes().arrangeBuiltinFunctionDeclaration(C.VoidTy, Args); | |||
2640 | auto *Fn = llvm::Function::Create( | |||
2641 | CGM.getTypes().GetFunctionType(CGFI), llvm::GlobalValue::InternalLinkage, | |||
2642 | "_omp_reduction_list_to_global_reduce_func", &CGM.getModule()); | |||
2643 | CGM.SetInternalFunctionAttributes(GlobalDecl(), Fn, CGFI); | |||
2644 | Fn->setDoesNotRecurse(); | |||
2645 | CodeGenFunction CGF(CGM); | |||
2646 | CGF.StartFunction(GlobalDecl(), C.VoidTy, Fn, CGFI, Args, Loc, Loc); | |||
2647 | ||||
2648 | CGBuilderTy &Bld = CGF.Builder; | |||
2649 | ||||
2650 | Address AddrBufferArg = CGF.GetAddrOfLocalVar(&BufferArg); | |||
2651 | QualType StaticTy = C.getRecordType(TeamReductionRec); | |||
2652 | llvm::Type *LLVMReductionsBufferTy = | |||
2653 | CGM.getTypes().ConvertTypeForMem(StaticTy); | |||
2654 | llvm::Value *BufferArrPtr = Bld.CreatePointerBitCastOrAddrSpaceCast( | |||
2655 | CGF.EmitLoadOfScalar(AddrBufferArg, /*Volatile=*/false, C.VoidPtrTy, Loc), | |||
2656 | LLVMReductionsBufferTy->getPointerTo()); | |||
2657 | ||||
2658 | // 1. Build a list of reduction variables. | |||
2659 | // void *RedList[<n>] = {<ReductionVars>[0], ..., <ReductionVars>[<n>-1]}; | |||
2660 | Address ReductionList = | |||
2661 | CGF.CreateMemTemp(ReductionArrayTy, ".omp.reduction.red_list"); | |||
2662 | auto IPriv = Privates.begin(); | |||
2663 | llvm::Value *Idxs[] = {llvm::ConstantInt::getNullValue(CGF.Int32Ty), | |||
2664 | CGF.EmitLoadOfScalar(CGF.GetAddrOfLocalVar(&IdxArg), | |||
2665 | /*Volatile=*/false, C.IntTy, | |||
2666 | Loc)}; | |||
2667 | unsigned Idx = 0; | |||
2668 | for (unsigned I = 0, E = Privates.size(); I < E; ++I, ++IPriv, ++Idx) { | |||
2669 | Address Elem = CGF.Builder.CreateConstArrayGEP(ReductionList, Idx); | |||
2670 | // Global = Buffer.VD[Idx]; | |||
2671 | const ValueDecl *VD = cast<DeclRefExpr>(*IPriv)->getDecl(); | |||
2672 | const FieldDecl *FD = VarFieldMap.lookup(VD); | |||
2673 | LValue GlobLVal = CGF.EmitLValueForField( | |||
2674 | CGF.MakeNaturalAlignAddrLValue(BufferArrPtr, StaticTy), FD); | |||
2675 | Address GlobAddr = GlobLVal.getAddress(CGF); | |||
2676 | llvm::Value *BufferPtr = Bld.CreateInBoundsGEP( | |||
2677 | GlobAddr.getElementType(), GlobAddr.getPointer(), Idxs); | |||
2678 | llvm::Value *Ptr = CGF.EmitCastToVoidPtr(BufferPtr); | |||
2679 | CGF.EmitStoreOfScalar(Ptr, Elem, /*Volatile=*/false, C.VoidPtrTy); | |||
2680 | if ((*IPriv)->getType()->isVariablyModifiedType()) { | |||
2681 | // Store array size. | |||
2682 | ++Idx; | |||
2683 | Elem = CGF.Builder.CreateConstArrayGEP(ReductionList, Idx); | |||
2684 | llvm::Value *Size = CGF.Builder.CreateIntCast( | |||
2685 | CGF.getVLASize( | |||
2686 | CGF.getContext().getAsVariableArrayType((*IPriv)->getType())) | |||
2687 | .NumElts, | |||
2688 | CGF.SizeTy, /*isSigned=*/false); | |||
2689 | CGF.Builder.CreateStore(CGF.Builder.CreateIntToPtr(Size, CGF.VoidPtrTy), | |||
2690 | Elem); | |||
2691 | } | |||
2692 | } | |||
2693 | ||||
2694 | // Call reduce_function(GlobalReduceList, ReduceList) | |||
2695 | llvm::Value *GlobalReduceList = | |||
2696 | CGF.EmitCastToVoidPtr(ReductionList.getPointer()); | |||
2697 | Address AddrReduceListArg = CGF.GetAddrOfLocalVar(&ReduceListArg); | |||
2698 | llvm::Value *ReducedPtr = CGF.EmitLoadOfScalar( | |||
2699 | AddrReduceListArg, /*Volatile=*/false, C.VoidPtrTy, Loc); | |||
2700 | CGM.getOpenMPRuntime().emitOutlinedFunctionCall( | |||
2701 | CGF, Loc, ReduceFn, {GlobalReduceList, ReducedPtr}); | |||
2702 | CGF.FinishFunction(); | |||
2703 | return Fn; | |||
2704 | } | |||
2705 | ||||
2706 | /// This function emits a helper that copies all the reduction variables from | |||
2707 | /// the team into the provided global buffer for the reduction variables. | |||
2708 | /// | |||
2709 | /// void list_to_global_copy_func(void *buffer, int Idx, void *reduce_data) | |||
2710 | /// For all data entries D in reduce_data: | |||
2711 | /// Copy buffer.D[Idx] to local D; | |||
2712 | static llvm::Value *emitGlobalToListCopyFunction( | |||
2713 | CodeGenModule &CGM, ArrayRef<const Expr *> Privates, | |||
2714 | QualType ReductionArrayTy, SourceLocation Loc, | |||
2715 | const RecordDecl *TeamReductionRec, | |||
2716 | const llvm::SmallDenseMap<const ValueDecl *, const FieldDecl *> | |||
2717 | &VarFieldMap) { | |||
2718 | ASTContext &C = CGM.getContext(); | |||
2719 | ||||
2720 | // Buffer: global reduction buffer. | |||
2721 | ImplicitParamDecl BufferArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, | |||
2722 | C.VoidPtrTy, ImplicitParamDecl::Other); | |||
2723 | // Idx: index of the buffer. | |||
2724 | ImplicitParamDecl IdxArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, C.IntTy, | |||
2725 | ImplicitParamDecl::Other); | |||
2726 | // ReduceList: thread local Reduce list. | |||
2727 | ImplicitParamDecl ReduceListArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, | |||
2728 | C.VoidPtrTy, ImplicitParamDecl::Other); | |||
2729 | FunctionArgList Args; | |||
2730 | Args.push_back(&BufferArg); | |||
2731 | Args.push_back(&IdxArg); | |||
2732 | Args.push_back(&ReduceListArg); | |||
2733 | ||||
2734 | const CGFunctionInfo &CGFI = | |||
2735 | CGM.getTypes().arrangeBuiltinFunctionDeclaration(C.VoidTy, Args); | |||
2736 | auto *Fn = llvm::Function::Create( | |||
2737 | CGM.getTypes().GetFunctionType(CGFI), llvm::GlobalValue::InternalLinkage, | |||
2738 | "_omp_reduction_global_to_list_copy_func", &CGM.getModule()); | |||
2739 | CGM.SetInternalFunctionAttributes(GlobalDecl(), Fn, CGFI); | |||
2740 | Fn->setDoesNotRecurse(); | |||
2741 | CodeGenFunction CGF(CGM); | |||
2742 | CGF.StartFunction(GlobalDecl(), C.VoidTy, Fn, CGFI, Args, Loc, Loc); | |||
2743 | ||||
2744 | CGBuilderTy &Bld = CGF.Builder; | |||
2745 | ||||
2746 | Address AddrReduceListArg = CGF.GetAddrOfLocalVar(&ReduceListArg); | |||
2747 | Address AddrBufferArg = CGF.GetAddrOfLocalVar(&BufferArg); | |||
2748 | Address LocalReduceList( | |||
2749 | Bld.CreatePointerBitCastOrAddrSpaceCast( | |||
2750 | CGF.EmitLoadOfScalar(AddrReduceListArg, /*Volatile=*/false, | |||
2751 | C.VoidPtrTy, Loc), | |||
2752 | CGF.ConvertTypeForMem(ReductionArrayTy)->getPointerTo()), | |||
2753 | CGF.getPointerAlign()); | |||
2754 | QualType StaticTy = C.getRecordType(TeamReductionRec); | |||
2755 | llvm::Type *LLVMReductionsBufferTy = | |||
2756 | CGM.getTypes().ConvertTypeForMem(StaticTy); | |||
2757 | llvm::Value *BufferArrPtr = Bld.CreatePointerBitCastOrAddrSpaceCast( | |||
2758 | CGF.EmitLoadOfScalar(AddrBufferArg, /*Volatile=*/false, C.VoidPtrTy, Loc), | |||
2759 | LLVMReductionsBufferTy->getPointerTo()); | |||
2760 | ||||
2761 | llvm::Value *Idxs[] = {llvm::ConstantInt::getNullValue(CGF.Int32Ty), | |||
2762 | CGF.EmitLoadOfScalar(CGF.GetAddrOfLocalVar(&IdxArg), | |||
2763 | /*Volatile=*/false, C.IntTy, | |||
2764 | Loc)}; | |||
2765 | unsigned Idx = 0; | |||
2766 | for (const Expr *Private : Privates) { | |||
2767 | // Reduce element = LocalReduceList[i] | |||
2768 | Address ElemPtrPtrAddr = Bld.CreateConstArrayGEP(LocalReduceList, Idx); | |||
2769 | llvm::Value *ElemPtrPtr = CGF.EmitLoadOfScalar( | |||
2770 | ElemPtrPtrAddr, /*Volatile=*/false, C.VoidPtrTy, SourceLocation()); | |||
2771 | // elemptr = ((CopyType*)(elemptrptr)) + I | |||
2772 | ElemPtrPtr = Bld.CreatePointerBitCastOrAddrSpaceCast( | |||
2773 | ElemPtrPtr, CGF.ConvertTypeForMem(Private->getType())->getPointerTo()); | |||
2774 | Address ElemPtr = | |||
2775 | Address(ElemPtrPtr, C.getTypeAlignInChars(Private->getType())); | |||
2776 | const ValueDecl *VD = cast<DeclRefExpr>(Private)->getDecl(); | |||
2777 | // Global = Buffer.VD[Idx]; | |||
2778 | const FieldDecl *FD = VarFieldMap.lookup(VD); | |||
2779 | LValue GlobLVal = CGF.EmitLValueForField( | |||
2780 | CGF.MakeNaturalAlignAddrLValue(BufferArrPtr, StaticTy), FD); | |||
2781 | Address GlobAddr = GlobLVal.getAddress(CGF); | |||
2782 | llvm::Value *BufferPtr = Bld.CreateInBoundsGEP( | |||
2783 | GlobAddr.getElementType(), GlobAddr.getPointer(), Idxs); | |||
2784 | GlobLVal.setAddress(Address(BufferPtr, GlobAddr.getAlignment())); | |||
2785 | switch (CGF.getEvaluationKind(Private->getType())) { | |||
2786 | case TEK_Scalar: { | |||
2787 | llvm::Value *V = CGF.EmitLoadOfScalar(GlobLVal, Loc); | |||
2788 | CGF.EmitStoreOfScalar(V, ElemPtr, /*Volatile=*/false, Private->getType(), | |||
2789 | LValueBaseInfo(AlignmentSource::Type), | |||
2790 | TBAAAccessInfo()); | |||
2791 | break; | |||
2792 | } | |||
2793 | case TEK_Complex: { | |||
2794 | CodeGenFunction::ComplexPairTy V = CGF.EmitLoadOfComplex(GlobLVal, Loc); | |||
2795 | CGF.EmitStoreOfComplex(V, CGF.MakeAddrLValue(ElemPtr, Private->getType()), | |||
2796 | /*isInit=*/false); | |||
2797 | break; | |||
2798 | } | |||
2799 | case TEK_Aggregate: | |||
2800 | CGF.EmitAggregateCopy(CGF.MakeAddrLValue(ElemPtr, Private->getType()), | |||
2801 | GlobLVal, Private->getType(), | |||
2802 | AggValueSlot::DoesNotOverlap); | |||
2803 | break; | |||
2804 | } | |||
2805 | ++Idx; | |||
2806 | } | |||
2807 | ||||
2808 | CGF.FinishFunction(); | |||
2809 | return Fn; | |||
2810 | } | |||
2811 | ||||
2812 | /// This function emits a helper that reduces all the reduction variables from | |||
2813 | /// the team into the provided global buffer for the reduction variables. | |||
2814 | /// | |||
2815 | /// void global_to_list_reduce_func(void *buffer, int Idx, void *reduce_data) | |||
2816 | /// void *GlobPtrs[]; | |||
2817 | /// GlobPtrs[0] = (void*)&buffer.D0[Idx]; | |||
2818 | /// ... | |||
2819 | /// GlobPtrs[N] = (void*)&buffer.DN[Idx]; | |||
2820 | /// reduce_function(reduce_data, GlobPtrs); | |||
2821 | static llvm::Value *emitGlobalToListReduceFunction( | |||
2822 | CodeGenModule &CGM, ArrayRef<const Expr *> Privates, | |||
2823 | QualType ReductionArrayTy, SourceLocation Loc, | |||
2824 | const RecordDecl *TeamReductionRec, | |||
2825 | const llvm::SmallDenseMap<const ValueDecl *, const FieldDecl *> | |||
2826 | &VarFieldMap, | |||
2827 | llvm::Function *ReduceFn) { | |||
2828 | ASTContext &C = CGM.getContext(); | |||
2829 | ||||
2830 | // Buffer: global reduction buffer. | |||
2831 | ImplicitParamDecl BufferArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, | |||
2832 | C.VoidPtrTy, ImplicitParamDecl::Other); | |||
2833 | // Idx: index of the buffer. | |||
2834 | ImplicitParamDecl IdxArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, C.IntTy, | |||
2835 | ImplicitParamDecl::Other); | |||
2836 | // ReduceList: thread local Reduce list. | |||
2837 | ImplicitParamDecl ReduceListArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, | |||
2838 | C.VoidPtrTy, ImplicitParamDecl::Other); | |||
2839 | FunctionArgList Args; | |||
2840 | Args.push_back(&BufferArg); | |||
2841 | Args.push_back(&IdxArg); | |||
2842 | Args.push_back(&ReduceListArg); | |||
2843 | ||||
2844 | const CGFunctionInfo &CGFI = | |||
2845 | CGM.getTypes().arrangeBuiltinFunctionDeclaration(C.VoidTy, Args); | |||
2846 | auto *Fn = llvm::Function::Create( | |||
2847 | CGM.getTypes().GetFunctionType(CGFI), llvm::GlobalValue::InternalLinkage, | |||
2848 | "_omp_reduction_global_to_list_reduce_func", &CGM.getModule()); | |||
2849 | CGM.SetInternalFunctionAttributes(GlobalDecl(), Fn, CGFI); | |||
2850 | Fn->setDoesNotRecurse(); | |||
2851 | CodeGenFunction CGF(CGM); | |||
2852 | CGF.StartFunction(GlobalDecl(), C.VoidTy, Fn, CGFI, Args, Loc, Loc); | |||
2853 | ||||
2854 | CGBuilderTy &Bld = CGF.Builder; | |||
2855 | ||||
2856 | Address AddrBufferArg = CGF.GetAddrOfLocalVar(&BufferArg); | |||
2857 | QualType StaticTy = C.getRecordType(TeamReductionRec); | |||
2858 | llvm::Type *LLVMReductionsBufferTy = | |||
2859 | CGM.getTypes().ConvertTypeForMem(StaticTy); | |||
2860 | llvm::Value *BufferArrPtr = Bld.CreatePointerBitCastOrAddrSpaceCast( | |||
2861 | CGF.EmitLoadOfScalar(AddrBufferArg, /*Volatile=*/false, C.VoidPtrTy, Loc), | |||
2862 | LLVMReductionsBufferTy->getPointerTo()); | |||
2863 | ||||
2864 | // 1. Build a list of reduction variables. | |||
2865 | // void *RedList[<n>] = {<ReductionVars>[0], ..., <ReductionVars>[<n>-1]}; | |||
2866 | Address ReductionList = | |||
2867 | CGF.CreateMemTemp(ReductionArrayTy, ".omp.reduction.red_list"); | |||
2868 | auto IPriv = Privates.begin(); | |||
2869 | llvm::Value *Idxs[] = {llvm::ConstantInt::getNullValue(CGF.Int32Ty), | |||
2870 | CGF.EmitLoadOfScalar(CGF.GetAddrOfLocalVar(&IdxArg), | |||
2871 | /*Volatile=*/false, C.IntTy, | |||
2872 | Loc)}; | |||
2873 | unsigned Idx = 0; | |||
2874 | for (unsigned I = 0, E = Privates.size(); I < E; ++I, ++IPriv, ++Idx) { | |||
2875 | Address Elem = CGF.Builder.CreateConstArrayGEP(ReductionList, Idx); | |||
2876 | // Global = Buffer.VD[Idx]; | |||
2877 | const ValueDecl *VD = cast<DeclRefExpr>(*IPriv)->getDecl(); | |||
2878 | const FieldDecl *FD = VarFieldMap.lookup(VD); | |||
2879 | LValue GlobLVal = CGF.EmitLValueForField( | |||
2880 | CGF.MakeNaturalAlignAddrLValue(BufferArrPtr, StaticTy), FD); | |||
2881 | Address GlobAddr = GlobLVal.getAddress(CGF); | |||
2882 | llvm::Value *BufferPtr = Bld.CreateInBoundsGEP( | |||
2883 | GlobAddr.getElementType(), GlobAddr.getPointer(), Idxs); | |||
2884 | llvm::Value *Ptr = CGF.EmitCastToVoidPtr(BufferPtr); | |||
2885 | CGF.EmitStoreOfScalar(Ptr, Elem, /*Volatile=*/false, C.VoidPtrTy); | |||
2886 | if ((*IPriv)->getType()->isVariablyModifiedType()) { | |||
2887 | // Store array size. | |||
2888 | ++Idx; | |||
2889 | Elem = CGF.Builder.CreateConstArrayGEP(ReductionList, Idx); | |||
2890 | llvm::Value *Size = CGF.Builder.CreateIntCast( | |||
2891 | CGF.getVLASize( | |||
2892 | CGF.getContext().getAsVariableArrayType((*IPriv)->getType())) | |||
2893 | .NumElts, | |||
2894 | CGF.SizeTy, /*isSigned=*/false); | |||
2895 | CGF.Builder.CreateStore(CGF.Builder.CreateIntToPtr(Size, CGF.VoidPtrTy), | |||
2896 | Elem); | |||
2897 | } | |||
2898 | } | |||
2899 | ||||
2900 | // Call reduce_function(ReduceList, GlobalReduceList) | |||
2901 | llvm::Value *GlobalReduceList = | |||
2902 | CGF.EmitCastToVoidPtr(ReductionList.getPointer()); | |||
2903 | Address AddrReduceListArg = CGF.GetAddrOfLocalVar(&ReduceListArg); | |||
2904 | llvm::Value *ReducedPtr = CGF.EmitLoadOfScalar( | |||
2905 | AddrReduceListArg, /*Volatile=*/false, C.VoidPtrTy, Loc); | |||
2906 | CGM.getOpenMPRuntime().emitOutlinedFunctionCall( | |||
2907 | CGF, Loc, ReduceFn, {ReducedPtr, GlobalReduceList}); | |||
2908 | CGF.FinishFunction(); | |||
2909 | return Fn; | |||
2910 | } | |||
2911 | ||||
2912 | /// | |||
2913 | /// Design of OpenMP reductions on the GPU | |||
2914 | /// | |||
2915 | /// Consider a typical OpenMP program with one or more reduction | |||
2916 | /// clauses: | |||
2917 | /// | |||
2918 | /// float foo; | |||
2919 | /// double bar; | |||
2920 | /// #pragma omp target teams distribute parallel for \ | |||
2921 | /// reduction(+:foo) reduction(*:bar) | |||
2922 | /// for (int i = 0; i < N; i++) { | |||
2923 | /// foo += A[i]; bar *= B[i]; | |||
2924 | /// } | |||
2925 | /// | |||
2926 | /// where 'foo' and 'bar' are reduced across all OpenMP threads in | |||
2927 | /// all teams. In our OpenMP implementation on the NVPTX device an | |||
2928 | /// OpenMP team is mapped to a CUDA threadblock and OpenMP threads | |||
2929 | /// within a team are mapped to CUDA threads within a threadblock. | |||
2930 | /// Our goal is to efficiently aggregate values across all OpenMP | |||
2931 | /// threads such that: | |||
2932 | /// | |||
2933 | /// - the compiler and runtime are logically concise, and | |||
2934 | /// - the reduction is performed efficiently in a hierarchical | |||
2935 | /// manner as follows: within OpenMP threads in the same warp, | |||
2936 | /// across warps in a threadblock, and finally across teams on | |||
2937 | /// the NVPTX device. | |||
2938 | /// | |||
2939 | /// Introduction to Decoupling | |||
2940 | /// | |||
2941 | /// We would like to decouple the compiler and the runtime so that the | |||
2942 | /// latter is ignorant of the reduction variables (number, data types) | |||
2943 | /// and the reduction operators. This allows a simpler interface | |||
2944 | /// and implementation while still attaining good performance. | |||
2945 | /// | |||
2946 | /// Pseudocode for the aforementioned OpenMP program generated by the | |||
2947 | /// compiler is as follows: | |||
2948 | /// | |||
2949 | /// 1. Create private copies of reduction variables on each OpenMP | |||
2950 | /// thread: 'foo_private', 'bar_private' | |||
2951 | /// 2. Each OpenMP thread reduces the chunk of 'A' and 'B' assigned | |||
2952 | /// to it and writes the result in 'foo_private' and 'bar_private' | |||
2953 | /// respectively. | |||
2954 | /// 3. Call the OpenMP runtime on the GPU to reduce within a team | |||
2955 | /// and store the result on the team master: | |||
2956 | /// | |||
2957 | /// __kmpc_nvptx_parallel_reduce_nowait_v2(..., | |||
2958 | /// reduceData, shuffleReduceFn, interWarpCpyFn) | |||
2959 | /// | |||
2960 | /// where: | |||
2961 | /// struct ReduceData { | |||
2962 | /// double *foo; | |||
2963 | /// double *bar; | |||
2964 | /// } reduceData | |||
2965 | /// reduceData.foo = &foo_private | |||
2966 | /// reduceData.bar = &bar_private | |||
2967 | /// | |||
2968 | /// 'shuffleReduceFn' and 'interWarpCpyFn' are pointers to two | |||
2969 | /// auxiliary functions generated by the compiler that operate on | |||
2970 | /// variables of type 'ReduceData'. They aid the runtime perform | |||
2971 | /// algorithmic steps in a data agnostic manner. | |||
2972 | /// | |||
2973 | /// 'shuffleReduceFn' is a pointer to a function that reduces data | |||
2974 | /// of type 'ReduceData' across two OpenMP threads (lanes) in the | |||
2975 | /// same warp. It takes the following arguments as input: | |||
2976 | /// | |||
2977 | /// a. variable of type 'ReduceData' on the calling lane, | |||
2978 | /// b. its lane_id, | |||
2979 | /// c. an offset relative to the current lane_id to generate a | |||
2980 | /// remote_lane_id. The remote lane contains the second | |||
2981 | /// variable of type 'ReduceData' that is to be reduced. | |||
2982 | /// d. an algorithm version parameter determining which reduction | |||
2983 | /// algorithm to use. | |||
2984 | /// | |||
2985 | /// 'shuffleReduceFn' retrieves data from the remote lane using | |||
2986 | /// efficient GPU shuffle intrinsics and reduces, using the | |||
2987 | /// algorithm specified by the 4th parameter, the two operands | |||
2988 | /// element-wise. The result is written to the first operand. | |||
2989 | /// | |||
2990 | /// Different reduction algorithms are implemented in different | |||
2991 | /// runtime functions, all calling 'shuffleReduceFn' to perform | |||
2992 | /// the essential reduction step. Therefore, based on the 4th | |||
2993 | /// parameter, this function behaves slightly differently to | |||
2994 | /// cooperate with the runtime to ensure correctness under | |||
2995 | /// different circumstances. | |||
2996 | /// | |||
2997 | /// 'InterWarpCpyFn' is a pointer to a function that transfers | |||
2998 | /// reduced variables across warps. It tunnels, through CUDA | |||
2999 | /// shared memory, the thread-private data of type 'ReduceData' | |||
3000 | /// from lane 0 of each warp to a lane in the first warp. | |||
3001 | /// 4. Call the OpenMP runtime on the GPU to reduce across teams. | |||
3002 | /// The last team writes the global reduced value to memory. | |||
3003 | /// | |||
3004 | /// ret = __kmpc_nvptx_teams_reduce_nowait(..., | |||
3005 | /// reduceData, shuffleReduceFn, interWarpCpyFn, | |||
3006 | /// scratchpadCopyFn, loadAndReduceFn) | |||
3007 | /// | |||
3008 | /// 'scratchpadCopyFn' is a helper that stores reduced | |||
3009 | /// data from the team master to a scratchpad array in | |||
3010 | /// global memory. | |||
3011 | /// | |||
3012 | /// 'loadAndReduceFn' is a helper that loads data from | |||
3013 | /// the scratchpad array and reduces it with the input | |||
3014 | /// operand. | |||
3015 | /// | |||
3016 | /// These compiler generated functions hide address | |||
3017 | /// calculation and alignment information from the runtime. | |||
3018 | /// 5. if ret == 1: | |||
3019 | /// The team master of the last team stores the reduced | |||
3020 | /// result to the globals in memory. | |||
3021 | /// foo += reduceData.foo; bar *= reduceData.bar | |||
3022 | /// | |||
3023 | /// | |||
3024 | /// Warp Reduction Algorithms | |||
3025 | /// | |||
3026 | /// On the warp level, we have three algorithms implemented in the | |||
3027 | /// OpenMP runtime depending on the number of active lanes: | |||
3028 | /// | |||
3029 | /// Full Warp Reduction | |||
3030 | /// | |||
3031 | /// The reduce algorithm within a warp where all lanes are active | |||
3032 | /// is implemented in the runtime as follows: | |||
3033 | /// | |||
3034 | /// full_warp_reduce(void *reduce_data, | |||
3035 | /// kmp_ShuffleReductFctPtr ShuffleReduceFn) { | |||
3036 | /// for (int offset = WARPSIZE/2; offset > 0; offset /= 2) | |||
3037 | /// ShuffleReduceFn(reduce_data, 0, offset, 0); | |||
3038 | /// } | |||
3039 | /// | |||
3040 | /// The algorithm completes in log(2, WARPSIZE) steps. | |||
3041 | /// | |||
3042 | /// 'ShuffleReduceFn' is used here with lane_id set to 0 because it is | |||
3043 | /// not used therefore we save instructions by not retrieving lane_id | |||
3044 | /// from the corresponding special registers. The 4th parameter, which | |||
3045 | /// represents the version of the algorithm being used, is set to 0 to | |||
3046 | /// signify full warp reduction. | |||
3047 | /// | |||
3048 | /// In this version, 'ShuffleReduceFn' behaves, per element, as follows: | |||
3049 | /// | |||
3050 | /// #reduce_elem refers to an element in the local lane's data structure | |||
3051 | /// #remote_elem is retrieved from a remote lane | |||
3052 | /// remote_elem = shuffle_down(reduce_elem, offset, WARPSIZE); | |||
3053 | /// reduce_elem = reduce_elem REDUCE_OP remote_elem; | |||
3054 | /// | |||
3055 | /// Contiguous Partial Warp Reduction | |||
3056 | /// | |||
3057 | /// This reduce algorithm is used within a warp where only the first | |||
3058 | /// 'n' (n <= WARPSIZE) lanes are active. It is typically used when the | |||
3059 | /// number of OpenMP threads in a parallel region is not a multiple of | |||
3060 | /// WARPSIZE. The algorithm is implemented in the runtime as follows: | |||
3061 | /// | |||
3062 | /// void | |||
3063 | /// contiguous_partial_reduce(void *reduce_data, | |||
3064 | /// kmp_ShuffleReductFctPtr ShuffleReduceFn, | |||
3065 | /// int size, int lane_id) { | |||
3066 | /// int curr_size; | |||
3067 | /// int offset; | |||
3068 | /// curr_size = size; | |||
3069 | /// mask = curr_size/2; | |||
3070 | /// while (offset>0) { | |||
3071 | /// ShuffleReduceFn(reduce_data, lane_id, offset, 1); | |||
3072 | /// curr_size = (curr_size+1)/2; | |||
3073 | /// offset = curr_size/2; | |||
3074 | /// } | |||
3075 | /// } | |||
3076 | /// | |||
3077 | /// In this version, 'ShuffleReduceFn' behaves, per element, as follows: | |||
3078 | /// | |||
3079 | /// remote_elem = shuffle_down(reduce_elem, offset, WARPSIZE); | |||
3080 | /// if (lane_id < offset) | |||
3081 | /// reduce_elem = reduce_elem REDUCE_OP remote_elem | |||
3082 | /// else | |||
3083 | /// reduce_elem = remote_elem | |||
3084 | /// | |||
3085 | /// This algorithm assumes that the data to be reduced are located in a | |||
3086 | /// contiguous subset of lanes starting from the first. When there is | |||
3087 | /// an odd number of active lanes, the data in the last lane is not | |||
3088 | /// aggregated with any other lane's dat but is instead copied over. | |||
3089 | /// | |||
3090 | /// Dispersed Partial Warp Reduction | |||
3091 | /// | |||
3092 | /// This algorithm is used within a warp when any discontiguous subset of | |||
3093 | /// lanes are active. It is used to implement the reduction operation | |||
3094 | /// across lanes in an OpenMP simd region or in a nested parallel region. | |||
3095 | /// | |||
3096 | /// void | |||
3097 | /// dispersed_partial_reduce(void *reduce_data, | |||
3098 | /// kmp_ShuffleReductFctPtr ShuffleReduceFn) { | |||
3099 | /// int size, remote_id; | |||
3100 | /// int logical_lane_id = number_of_active_lanes_before_me() * 2; | |||
3101 | /// do { | |||
3102 | /// remote_id = next_active_lane_id_right_after_me(); | |||
3103 | /// # the above function returns 0 of no active lane | |||
3104 | /// # is present right after the current lane. | |||
3105 | /// size = number_of_active_lanes_in_this_warp(); | |||
3106 | /// logical_lane_id /= 2; | |||
3107 | /// ShuffleReduceFn(reduce_data, logical_lane_id, | |||
3108 | /// remote_id-1-threadIdx.x, 2); | |||
3109 | /// } while (logical_lane_id % 2 == 0 && size > 1); | |||
3110 | /// } | |||
3111 | /// | |||
3112 | /// There is no assumption made about the initial state of the reduction. | |||
3113 | /// Any number of lanes (>=1) could be active at any position. The reduction | |||
3114 | /// result is returned in the first active lane. | |||
3115 | /// | |||
3116 | /// In this version, 'ShuffleReduceFn' behaves, per element, as follows: | |||
3117 | /// | |||
3118 | /// remote_elem = shuffle_down(reduce_elem, offset, WARPSIZE); | |||
3119 | /// if (lane_id % 2 == 0 && offset > 0) | |||
3120 | /// reduce_elem = reduce_elem REDUCE_OP remote_elem | |||
3121 | /// else | |||
3122 | /// reduce_elem = remote_elem | |||
3123 | /// | |||
3124 | /// | |||
3125 | /// Intra-Team Reduction | |||
3126 | /// | |||
3127 | /// This function, as implemented in the runtime call | |||
3128 | /// '__kmpc_nvptx_parallel_reduce_nowait_v2', aggregates data across OpenMP | |||
3129 | /// threads in a team. It first reduces within a warp using the | |||
3130 | /// aforementioned algorithms. We then proceed to gather all such | |||
3131 | /// reduced values at the first warp. | |||
3132 | /// | |||
3133 | /// The runtime makes use of the function 'InterWarpCpyFn', which copies | |||
3134 | /// data from each of the "warp master" (zeroth lane of each warp, where | |||
3135 | /// warp-reduced data is held) to the zeroth warp. This step reduces (in | |||
3136 | /// a mathematical sense) the problem of reduction across warp masters in | |||
3137 | /// a block to the problem of warp reduction. | |||
3138 | /// | |||
3139 | /// | |||
3140 | /// Inter-Team Reduction | |||
3141 | /// | |||
3142 | /// Once a team has reduced its data to a single value, it is stored in | |||
3143 | /// a global scratchpad array. Since each team has a distinct slot, this | |||
3144 | /// can be done without locking. | |||
3145 | /// | |||
3146 | /// The last team to write to the scratchpad array proceeds to reduce the | |||
3147 | /// scratchpad array. One or more workers in the last team use the helper | |||
3148 | /// 'loadAndReduceDataFn' to load and reduce values from the array, i.e., | |||
3149 | /// the k'th worker reduces every k'th element. | |||
3150 | /// | |||
3151 | /// Finally, a call is made to '__kmpc_nvptx_parallel_reduce_nowait_v2' to | |||
3152 | /// reduce across workers and compute a globally reduced value. | |||
3153 | /// | |||
3154 | void CGOpenMPRuntimeGPU::emitReduction( | |||
3155 | CodeGenFunction &CGF, SourceLocation Loc, ArrayRef<const Expr *> Privates, | |||
3156 | ArrayRef<const Expr *> LHSExprs, ArrayRef<const Expr *> RHSExprs, | |||
3157 | ArrayRef<const Expr *> ReductionOps, ReductionOptionsTy Options) { | |||
3158 | if (!CGF.HaveInsertPoint()) | |||
3159 | return; | |||
3160 | ||||
3161 | bool ParallelReduction = isOpenMPParallelDirective(Options.ReductionKind); | |||
3162 | #ifndef NDEBUG | |||
3163 | bool TeamsReduction = isOpenMPTeamsDirective(Options.ReductionKind); | |||
3164 | #endif | |||
3165 | ||||
3166 | if (Options.SimpleReduction) { | |||
3167 | assert(!TeamsReduction && !ParallelReduction &&(static_cast <bool> (!TeamsReduction && !ParallelReduction && "Invalid reduction selection in emitReduction.") ? void (0) : __assert_fail ("!TeamsReduction && !ParallelReduction && \"Invalid reduction selection in emitReduction.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 3168, __extension__ __PRETTY_FUNCTION__)) | |||
3168 | "Invalid reduction selection in emitReduction.")(static_cast <bool> (!TeamsReduction && !ParallelReduction && "Invalid reduction selection in emitReduction.") ? void (0) : __assert_fail ("!TeamsReduction && !ParallelReduction && \"Invalid reduction selection in emitReduction.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 3168, __extension__ __PRETTY_FUNCTION__)); | |||
3169 | CGOpenMPRuntime::emitReduction(CGF, Loc, Privates, LHSExprs, RHSExprs, | |||
3170 | ReductionOps, Options); | |||
3171 | return; | |||
3172 | } | |||
3173 | ||||
3174 | assert((TeamsReduction || ParallelReduction) &&(static_cast <bool> ((TeamsReduction || ParallelReduction ) && "Invalid reduction selection in emitReduction.") ? void (0) : __assert_fail ("(TeamsReduction || ParallelReduction) && \"Invalid reduction selection in emitReduction.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 3175, __extension__ __PRETTY_FUNCTION__)) | |||
3175 | "Invalid reduction selection in emitReduction.")(static_cast <bool> ((TeamsReduction || ParallelReduction ) && "Invalid reduction selection in emitReduction.") ? void (0) : __assert_fail ("(TeamsReduction || ParallelReduction) && \"Invalid reduction selection in emitReduction.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 3175, __extension__ __PRETTY_FUNCTION__)); | |||
3176 | ||||
3177 | // Build res = __kmpc_reduce{_nowait}(<gtid>, <n>, sizeof(RedList), | |||
3178 | // RedList, shuffle_reduce_func, interwarp_copy_func); | |||
3179 | // or | |||
3180 | // Build res = __kmpc_reduce_teams_nowait_simple(<loc>, <gtid>, <lck>); | |||
3181 | llvm::Value *RTLoc = emitUpdateLocation(CGF, Loc); | |||
3182 | llvm::Value *ThreadId = getThreadID(CGF, Loc); | |||
3183 | ||||
3184 | llvm::Value *Res; | |||
3185 | ASTContext &C = CGM.getContext(); | |||
3186 | // 1. Build a list of reduction variables. | |||
3187 | // void *RedList[<n>] = {<ReductionVars>[0], ..., <ReductionVars>[<n>-1]}; | |||
3188 | auto Size = RHSExprs.size(); | |||
3189 | for (const Expr *E : Privates) { | |||
3190 | if (E->getType()->isVariablyModifiedType()) | |||
3191 | // Reserve place for array size. | |||
3192 | ++Size; | |||
3193 | } | |||
3194 | llvm::APInt ArraySize(/*unsigned int numBits=*/32, Size); | |||
3195 | QualType ReductionArrayTy = | |||
3196 | C.getConstantArrayType(C.VoidPtrTy, ArraySize, nullptr, ArrayType::Normal, | |||
3197 | /*IndexTypeQuals=*/0); | |||
3198 | Address ReductionList = | |||
3199 | CGF.CreateMemTemp(ReductionArrayTy, ".omp.reduction.red_list"); | |||
3200 | auto IPriv = Privates.begin(); | |||
3201 | unsigned Idx = 0; | |||
3202 | for (unsigned I = 0, E = RHSExprs.size(); I < E; ++I, ++IPriv, ++Idx) { | |||
3203 | Address Elem = CGF.Builder.CreateConstArrayGEP(ReductionList, Idx); | |||
3204 | CGF.Builder.CreateStore( | |||
3205 | CGF.Builder.CreatePointerBitCastOrAddrSpaceCast( | |||
3206 | CGF.EmitLValue(RHSExprs[I]).getPointer(CGF), CGF.VoidPtrTy), | |||
3207 | Elem); | |||
3208 | if ((*IPriv)->getType()->isVariablyModifiedType()) { | |||
3209 | // Store array size. | |||
3210 | ++Idx; | |||
3211 | Elem = CGF.Builder.CreateConstArrayGEP(ReductionList, Idx); | |||
3212 | llvm::Value *Size = CGF.Builder.CreateIntCast( | |||
3213 | CGF.getVLASize( | |||
3214 | CGF.getContext().getAsVariableArrayType((*IPriv)->getType())) | |||
3215 | .NumElts, | |||
3216 | CGF.SizeTy, /*isSigned=*/false); | |||
3217 | CGF.Builder.CreateStore(CGF.Builder.CreateIntToPtr(Size, CGF.VoidPtrTy), | |||
3218 | Elem); | |||
3219 | } | |||
3220 | } | |||
3221 | ||||
3222 | llvm::Value *RL = CGF.Builder.CreatePointerBitCastOrAddrSpaceCast( | |||
3223 | ReductionList.getPointer(), CGF.VoidPtrTy); | |||
3224 | llvm::Function *ReductionFn = emitReductionFunction( | |||
3225 | Loc, CGF.ConvertTypeForMem(ReductionArrayTy)->getPointerTo(), Privates, | |||
3226 | LHSExprs, RHSExprs, ReductionOps); | |||
3227 | llvm::Value *ReductionArrayTySize = CGF.getTypeSize(ReductionArrayTy); | |||
3228 | llvm::Function *ShuffleAndReduceFn = emitShuffleAndReduceFunction( | |||
3229 | CGM, Privates, ReductionArrayTy, ReductionFn, Loc); | |||
3230 | llvm::Value *InterWarpCopyFn = | |||
3231 | emitInterWarpCopyFunction(CGM, Privates, ReductionArrayTy, Loc); | |||
3232 | ||||
3233 | if (ParallelReduction) { | |||
3234 | llvm::Value *Args[] = {RTLoc, | |||
3235 | ThreadId, | |||
3236 | CGF.Builder.getInt32(RHSExprs.size()), | |||
3237 | ReductionArrayTySize, | |||
3238 | RL, | |||
3239 | ShuffleAndReduceFn, | |||
3240 | InterWarpCopyFn}; | |||
3241 | ||||
3242 | Res = CGF.EmitRuntimeCall( | |||
3243 | OMPBuilder.getOrCreateRuntimeFunction( | |||
3244 | CGM.getModule(), OMPRTL___kmpc_nvptx_parallel_reduce_nowait_v2), | |||
3245 | Args); | |||
3246 | } else { | |||
3247 | assert(TeamsReduction && "expected teams reduction.")(static_cast <bool> (TeamsReduction && "expected teams reduction." ) ? void (0) : __assert_fail ("TeamsReduction && \"expected teams reduction.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 3247, __extension__ __PRETTY_FUNCTION__)); | |||
3248 | llvm::SmallDenseMap<const ValueDecl *, const FieldDecl *> VarFieldMap; | |||
3249 | llvm::SmallVector<const ValueDecl *, 4> PrivatesReductions(Privates.size()); | |||
3250 | int Cnt = 0; | |||
3251 | for (const Expr *DRE : Privates) { | |||
3252 | PrivatesReductions[Cnt] = cast<DeclRefExpr>(DRE)->getDecl(); | |||
3253 | ++Cnt; | |||
3254 | } | |||
3255 | const RecordDecl *TeamReductionRec = ::buildRecordForGlobalizedVars( | |||
3256 | CGM.getContext(), PrivatesReductions, llvm::None, VarFieldMap, | |||
3257 | C.getLangOpts().OpenMPCUDAReductionBufNum); | |||
3258 | TeamsReductions.push_back(TeamReductionRec); | |||
3259 | if (!KernelTeamsReductionPtr) { | |||
3260 | KernelTeamsReductionPtr = new llvm::GlobalVariable( | |||
3261 | CGM.getModule(), CGM.VoidPtrTy, /*isConstant=*/true, | |||
3262 | llvm::GlobalValue::InternalLinkage, nullptr, | |||
3263 | "_openmp_teams_reductions_buffer_$_$ptr"); | |||
3264 | } | |||
3265 | llvm::Value *GlobalBufferPtr = CGF.EmitLoadOfScalar( | |||
3266 | Address(KernelTeamsReductionPtr, CGM.getPointerAlign()), | |||
3267 | /*Volatile=*/false, C.getPointerType(C.VoidPtrTy), Loc); | |||
3268 | llvm::Value *GlobalToBufferCpyFn = ::emitListToGlobalCopyFunction( | |||
3269 | CGM, Privates, ReductionArrayTy, Loc, TeamReductionRec, VarFieldMap); | |||
3270 | llvm::Value *GlobalToBufferRedFn = ::emitListToGlobalReduceFunction( | |||
3271 | CGM, Privates, ReductionArrayTy, Loc, TeamReductionRec, VarFieldMap, | |||
3272 | ReductionFn); | |||
3273 | llvm::Value *BufferToGlobalCpyFn = ::emitGlobalToListCopyFunction( | |||
3274 | CGM, Privates, ReductionArrayTy, Loc, TeamReductionRec, VarFieldMap); | |||
3275 | llvm::Value *BufferToGlobalRedFn = ::emitGlobalToListReduceFunction( | |||
3276 | CGM, Privates, ReductionArrayTy, Loc, TeamReductionRec, VarFieldMap, | |||
3277 | ReductionFn); | |||
3278 | ||||
3279 | llvm::Value *Args[] = { | |||
3280 | RTLoc, | |||
3281 | ThreadId, | |||
3282 | GlobalBufferPtr, | |||
3283 | CGF.Builder.getInt32(C.getLangOpts().OpenMPCUDAReductionBufNum), | |||
3284 | RL, | |||
3285 | ShuffleAndReduceFn, | |||
3286 | InterWarpCopyFn, | |||
3287 | GlobalToBufferCpyFn, | |||
3288 | GlobalToBufferRedFn, | |||
3289 | BufferToGlobalCpyFn, | |||
3290 | BufferToGlobalRedFn}; | |||
3291 | ||||
3292 | Res = CGF.EmitRuntimeCall( | |||
3293 | OMPBuilder.getOrCreateRuntimeFunction( | |||
3294 | CGM.getModule(), OMPRTL___kmpc_nvptx_teams_reduce_nowait_v2), | |||
3295 | Args); | |||
3296 | } | |||
3297 | ||||
3298 | // 5. Build if (res == 1) | |||
3299 | llvm::BasicBlock *ExitBB = CGF.createBasicBlock(".omp.reduction.done"); | |||
3300 | llvm::BasicBlock *ThenBB = CGF.createBasicBlock(".omp.reduction.then"); | |||
3301 | llvm::Value *Cond = CGF.Builder.CreateICmpEQ( | |||
3302 | Res, llvm::ConstantInt::get(CGM.Int32Ty, /*V=*/1)); | |||
3303 | CGF.Builder.CreateCondBr(Cond, ThenBB, ExitBB); | |||
3304 | ||||
3305 | // 6. Build then branch: where we have reduced values in the master | |||
3306 | // thread in each team. | |||
3307 | // __kmpc_end_reduce{_nowait}(<gtid>); | |||
3308 | // break; | |||
3309 | CGF.EmitBlock(ThenBB); | |||
3310 | ||||
3311 | // Add emission of __kmpc_end_reduce{_nowait}(<gtid>); | |||
3312 | auto &&CodeGen = [Privates, LHSExprs, RHSExprs, ReductionOps, | |||
3313 | this](CodeGenFunction &CGF, PrePostActionTy &Action) { | |||
3314 | auto IPriv = Privates.begin(); | |||
3315 | auto ILHS = LHSExprs.begin(); | |||
3316 | auto IRHS = RHSExprs.begin(); | |||
3317 | for (const Expr *E : ReductionOps) { | |||
3318 | emitSingleReductionCombiner(CGF, E, *IPriv, cast<DeclRefExpr>(*ILHS), | |||
3319 | cast<DeclRefExpr>(*IRHS)); | |||
3320 | ++IPriv; | |||
3321 | ++ILHS; | |||
3322 | ++IRHS; | |||
3323 | } | |||
3324 | }; | |||
3325 | llvm::Value *EndArgs[] = {ThreadId}; | |||
3326 | RegionCodeGenTy RCG(CodeGen); | |||
3327 | NVPTXActionTy Action( | |||
3328 | nullptr, llvm::None, | |||
3329 | OMPBuilder.getOrCreateRuntimeFunction( | |||
3330 | CGM.getModule(), OMPRTL___kmpc_nvptx_end_reduce_nowait), | |||
3331 | EndArgs); | |||
3332 | RCG.setAction(Action); | |||
3333 | RCG(CGF); | |||
3334 | // There is no need to emit line number for unconditional branch. | |||
3335 | (void)ApplyDebugLocation::CreateEmpty(CGF); | |||
3336 | CGF.EmitBlock(ExitBB, /*IsFinished=*/true); | |||
3337 | } | |||
3338 | ||||
3339 | const VarDecl * | |||
3340 | CGOpenMPRuntimeGPU::translateParameter(const FieldDecl *FD, | |||
3341 | const VarDecl *NativeParam) const { | |||
3342 | if (!NativeParam->getType()->isReferenceType()) | |||
3343 | return NativeParam; | |||
3344 | QualType ArgType = NativeParam->getType(); | |||
3345 | QualifierCollector QC; | |||
3346 | const Type *NonQualTy = QC.strip(ArgType); | |||
3347 | QualType PointeeTy = cast<ReferenceType>(NonQualTy)->getPointeeType(); | |||
3348 | if (const auto *Attr = FD->getAttr<OMPCaptureKindAttr>()) { | |||
3349 | if (Attr->getCaptureKind() == OMPC_map) { | |||
3350 | PointeeTy = CGM.getContext().getAddrSpaceQualType(PointeeTy, | |||
3351 | LangAS::opencl_global); | |||
3352 | } | |||
3353 | } | |||
3354 | ArgType = CGM.getContext().getPointerType(PointeeTy); | |||
3355 | QC.addRestrict(); | |||
3356 | enum { NVPTX_local_addr = 5 }; | |||
3357 | QC.addAddressSpace(getLangASFromTargetAS(NVPTX_local_addr)); | |||
3358 | ArgType = QC.apply(CGM.getContext(), ArgType); | |||
3359 | if (isa<ImplicitParamDecl>(NativeParam)) | |||
3360 | return ImplicitParamDecl::Create( | |||
3361 | CGM.getContext(), /*DC=*/nullptr, NativeParam->getLocation(), | |||
3362 | NativeParam->getIdentifier(), ArgType, ImplicitParamDecl::Other); | |||
3363 | return ParmVarDecl::Create( | |||
3364 | CGM.getContext(), | |||
3365 | const_cast<DeclContext *>(NativeParam->getDeclContext()), | |||
3366 | NativeParam->getBeginLoc(), NativeParam->getLocation(), | |||
3367 | NativeParam->getIdentifier(), ArgType, | |||
3368 | /*TInfo=*/nullptr, SC_None, /*DefArg=*/nullptr); | |||
3369 | } | |||
3370 | ||||
3371 | Address | |||
3372 | CGOpenMPRuntimeGPU::getParameterAddress(CodeGenFunction &CGF, | |||
3373 | const VarDecl *NativeParam, | |||
3374 | const VarDecl *TargetParam) const { | |||
3375 | assert(NativeParam != TargetParam &&(static_cast <bool> (NativeParam != TargetParam && NativeParam->getType()->isReferenceType() && "Native arg must not be the same as target arg." ) ? void (0) : __assert_fail ("NativeParam != TargetParam && NativeParam->getType()->isReferenceType() && \"Native arg must not be the same as target arg.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 3377, __extension__ __PRETTY_FUNCTION__)) | |||
3376 | NativeParam->getType()->isReferenceType() &&(static_cast <bool> (NativeParam != TargetParam && NativeParam->getType()->isReferenceType() && "Native arg must not be the same as target arg." ) ? void (0) : __assert_fail ("NativeParam != TargetParam && NativeParam->getType()->isReferenceType() && \"Native arg must not be the same as target arg.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 3377, __extension__ __PRETTY_FUNCTION__)) | |||
3377 | "Native arg must not be the same as target arg.")(static_cast <bool> (NativeParam != TargetParam && NativeParam->getType()->isReferenceType() && "Native arg must not be the same as target arg." ) ? void (0) : __assert_fail ("NativeParam != TargetParam && NativeParam->getType()->isReferenceType() && \"Native arg must not be the same as target arg.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 3377, __extension__ __PRETTY_FUNCTION__)); | |||
3378 | Address LocalAddr = CGF.GetAddrOfLocalVar(TargetParam); | |||
3379 | QualType NativeParamType = NativeParam->getType(); | |||
3380 | QualifierCollector QC; | |||
3381 | const Type *NonQualTy = QC.strip(NativeParamType); | |||
3382 | QualType NativePointeeTy = cast<ReferenceType>(NonQualTy)->getPointeeType(); | |||
3383 | unsigned NativePointeeAddrSpace = | |||
3384 | CGF.getContext().getTargetAddressSpace(NativePointeeTy); | |||
3385 | QualType TargetTy = TargetParam->getType(); | |||
3386 | llvm::Value *TargetAddr = CGF.EmitLoadOfScalar( | |||
3387 | LocalAddr, /*Volatile=*/false, TargetTy, SourceLocation()); | |||
3388 | // First cast to generic. | |||
3389 | TargetAddr = CGF.Builder.CreatePointerBitCastOrAddrSpaceCast( | |||
3390 | TargetAddr, TargetAddr->getType()->getPointerElementType()->getPointerTo( | |||
3391 | /*AddrSpace=*/0)); | |||
3392 | // Cast from generic to native address space. | |||
3393 | TargetAddr = CGF.Builder.CreatePointerBitCastOrAddrSpaceCast( | |||
3394 | TargetAddr, TargetAddr->getType()->getPointerElementType()->getPointerTo( | |||
3395 | NativePointeeAddrSpace)); | |||
3396 | Address NativeParamAddr = CGF.CreateMemTemp(NativeParamType); | |||
3397 | CGF.EmitStoreOfScalar(TargetAddr, NativeParamAddr, /*Volatile=*/false, | |||
3398 | NativeParamType); | |||
3399 | return NativeParamAddr; | |||
3400 | } | |||
3401 | ||||
3402 | void CGOpenMPRuntimeGPU::emitOutlinedFunctionCall( | |||
3403 | CodeGenFunction &CGF, SourceLocation Loc, llvm::FunctionCallee OutlinedFn, | |||
3404 | ArrayRef<llvm::Value *> Args) const { | |||
3405 | SmallVector<llvm::Value *, 4> TargetArgs; | |||
3406 | TargetArgs.reserve(Args.size()); | |||
3407 | auto *FnType = OutlinedFn.getFunctionType(); | |||
3408 | for (unsigned I = 0, E = Args.size(); I < E; ++I) { | |||
3409 | if (FnType->isVarArg() && FnType->getNumParams() <= I) { | |||
3410 | TargetArgs.append(std::next(Args.begin(), I), Args.end()); | |||
3411 | break; | |||
3412 | } | |||
3413 | llvm::Type *TargetType = FnType->getParamType(I); | |||
3414 | llvm::Value *NativeArg = Args[I]; | |||
3415 | if (!TargetType->isPointerTy()) { | |||
3416 | TargetArgs.emplace_back(NativeArg); | |||
3417 | continue; | |||
3418 | } | |||
3419 | llvm::Value *TargetArg = CGF.Builder.CreatePointerBitCastOrAddrSpaceCast( | |||
3420 | NativeArg, | |||
3421 | NativeArg->getType()->getPointerElementType()->getPointerTo()); | |||
3422 | TargetArgs.emplace_back( | |||
3423 | CGF.Builder.CreatePointerBitCastOrAddrSpaceCast(TargetArg, TargetType)); | |||
3424 | } | |||
3425 | CGOpenMPRuntime::emitOutlinedFunctionCall(CGF, Loc, OutlinedFn, TargetArgs); | |||
3426 | } | |||
3427 | ||||
3428 | /// Emit function which wraps the outline parallel region | |||
3429 | /// and controls the arguments which are passed to this function. | |||
3430 | /// The wrapper ensures that the outlined function is called | |||
3431 | /// with the correct arguments when data is shared. | |||
3432 | llvm::Function *CGOpenMPRuntimeGPU::createParallelDataSharingWrapper( | |||
3433 | llvm::Function *OutlinedParallelFn, const OMPExecutableDirective &D) { | |||
3434 | ASTContext &Ctx = CGM.getContext(); | |||
3435 | const auto &CS = *D.getCapturedStmt(OMPD_parallel); | |||
3436 | ||||
3437 | // Create a function that takes as argument the source thread. | |||
3438 | FunctionArgList WrapperArgs; | |||
3439 | QualType Int16QTy = | |||
3440 | Ctx.getIntTypeForBitwidth(/*DestWidth=*/16, /*Signed=*/false); | |||
3441 | QualType Int32QTy = | |||
3442 | Ctx.getIntTypeForBitwidth(/*DestWidth=*/32, /*Signed=*/false); | |||
3443 | ImplicitParamDecl ParallelLevelArg(Ctx, /*DC=*/nullptr, D.getBeginLoc(), | |||
3444 | /*Id=*/nullptr, Int16QTy, | |||
3445 | ImplicitParamDecl::Other); | |||
3446 | ImplicitParamDecl WrapperArg(Ctx, /*DC=*/nullptr, D.getBeginLoc(), | |||
3447 | /*Id=*/nullptr, Int32QTy, | |||
3448 | ImplicitParamDecl::Other); | |||
3449 | WrapperArgs.emplace_back(&ParallelLevelArg); | |||
3450 | WrapperArgs.emplace_back(&WrapperArg); | |||
3451 | ||||
3452 | const CGFunctionInfo &CGFI = | |||
3453 | CGM.getTypes().arrangeBuiltinFunctionDeclaration(Ctx.VoidTy, WrapperArgs); | |||
3454 | ||||
3455 | auto *Fn = llvm::Function::Create( | |||
3456 | CGM.getTypes().GetFunctionType(CGFI), llvm::GlobalValue::InternalLinkage, | |||
3457 | Twine(OutlinedParallelFn->getName(), "_wrapper"), &CGM.getModule()); | |||
3458 | ||||
3459 | // Ensure we do not inline the function. This is trivially true for the ones | |||
3460 | // passed to __kmpc_fork_call but the ones calles in serialized regions | |||
3461 | // could be inlined. This is not a perfect but it is closer to the invariant | |||
3462 | // we want, namely, every data environment starts with a new function. | |||
3463 | // TODO: We should pass the if condition to the runtime function and do the | |||
3464 | // handling there. Much cleaner code. | |||
3465 | Fn->addFnAttr(llvm::Attribute::NoInline); | |||
3466 | ||||
3467 | CGM.SetInternalFunctionAttributes(GlobalDecl(), Fn, CGFI); | |||
3468 | Fn->setLinkage(llvm::GlobalValue::InternalLinkage); | |||
3469 | Fn->setDoesNotRecurse(); | |||
3470 | ||||
3471 | CodeGenFunction CGF(CGM, /*suppressNewContext=*/true); | |||
3472 | CGF.StartFunction(GlobalDecl(), Ctx.VoidTy, Fn, CGFI, WrapperArgs, | |||
3473 | D.getBeginLoc(), D.getBeginLoc()); | |||
3474 | ||||
3475 | const auto *RD = CS.getCapturedRecordDecl(); | |||
3476 | auto CurField = RD->field_begin(); | |||
3477 | ||||
3478 | Address ZeroAddr = CGF.CreateDefaultAlignTempAlloca(CGF.Int32Ty, | |||
3479 | /*Name=*/".zero.addr"); | |||
3480 | CGF.InitTempAlloca(ZeroAddr, CGF.Builder.getInt32(/*C*/ 0)); | |||
3481 | // Get the array of arguments. | |||
3482 | SmallVector<llvm::Value *, 8> Args; | |||
3483 | ||||
3484 | Args.emplace_back(CGF.GetAddrOfLocalVar(&WrapperArg).getPointer()); | |||
3485 | Args.emplace_back(ZeroAddr.getPointer()); | |||
3486 | ||||
3487 | CGBuilderTy &Bld = CGF.Builder; | |||
3488 | auto CI = CS.capture_begin(); | |||
3489 | ||||
3490 | // Use global memory for data sharing. | |||
3491 | // Handle passing of global args to workers. | |||
3492 | Address GlobalArgs = | |||
3493 | CGF.CreateDefaultAlignTempAlloca(CGF.VoidPtrPtrTy, "global_args"); | |||
3494 | llvm::Value *GlobalArgsPtr = GlobalArgs.getPointer(); | |||
3495 | llvm::Value *DataSharingArgs[] = {GlobalArgsPtr}; | |||
3496 | CGF.EmitRuntimeCall(OMPBuilder.getOrCreateRuntimeFunction( | |||
3497 | CGM.getModule(), OMPRTL___kmpc_get_shared_variables), | |||
3498 | DataSharingArgs); | |||
3499 | ||||
3500 | // Retrieve the shared variables from the list of references returned | |||
3501 | // by the runtime. Pass the variables to the outlined function. | |||
3502 | Address SharedArgListAddress = Address::invalid(); | |||
3503 | if (CS.capture_size() > 0 || | |||
3504 | isOpenMPLoopBoundSharingDirective(D.getDirectiveKind())) { | |||
3505 | SharedArgListAddress = CGF.EmitLoadOfPointer( | |||
3506 | GlobalArgs, CGF.getContext() | |||
3507 | .getPointerType(CGF.getContext().getPointerType( | |||
3508 | CGF.getContext().VoidPtrTy)) | |||
3509 | .castAs<PointerType>()); | |||
3510 | } | |||
3511 | unsigned Idx = 0; | |||
3512 | if (isOpenMPLoopBoundSharingDirective(D.getDirectiveKind())) { | |||
3513 | Address Src = Bld.CreateConstInBoundsGEP(SharedArgListAddress, Idx); | |||
3514 | Address TypedAddress = Bld.CreatePointerBitCastOrAddrSpaceCast( | |||
3515 | Src, CGF.SizeTy->getPointerTo()); | |||
3516 | llvm::Value *LB = CGF.EmitLoadOfScalar( | |||
3517 | TypedAddress, | |||
3518 | /*Volatile=*/false, | |||
3519 | CGF.getContext().getPointerType(CGF.getContext().getSizeType()), | |||
3520 | cast<OMPLoopDirective>(D).getLowerBoundVariable()->getExprLoc()); | |||
3521 | Args.emplace_back(LB); | |||
3522 | ++Idx; | |||
3523 | Src = Bld.CreateConstInBoundsGEP(SharedArgListAddress, Idx); | |||
3524 | TypedAddress = Bld.CreatePointerBitCastOrAddrSpaceCast( | |||
3525 | Src, CGF.SizeTy->getPointerTo()); | |||
3526 | llvm::Value *UB = CGF.EmitLoadOfScalar( | |||
3527 | TypedAddress, | |||
3528 | /*Volatile=*/false, | |||
3529 | CGF.getContext().getPointerType(CGF.getContext().getSizeType()), | |||
3530 | cast<OMPLoopDirective>(D).getUpperBoundVariable()->getExprLoc()); | |||
3531 | Args.emplace_back(UB); | |||
3532 | ++Idx; | |||
3533 | } | |||
3534 | if (CS.capture_size() > 0) { | |||
3535 | ASTContext &CGFContext = CGF.getContext(); | |||
3536 | for (unsigned I = 0, E = CS.capture_size(); I < E; ++I, ++CI, ++CurField) { | |||
3537 | QualType ElemTy = CurField->getType(); | |||
3538 | Address Src = Bld.CreateConstInBoundsGEP(SharedArgListAddress, I + Idx); | |||
3539 | Address TypedAddress = Bld.CreatePointerBitCastOrAddrSpaceCast( | |||
3540 | Src, CGF.ConvertTypeForMem(CGFContext.getPointerType(ElemTy))); | |||
3541 | llvm::Value *Arg = CGF.EmitLoadOfScalar(TypedAddress, | |||
3542 | /*Volatile=*/false, | |||
3543 | CGFContext.getPointerType(ElemTy), | |||
3544 | CI->getLocation()); | |||
3545 | if (CI->capturesVariableByCopy() && | |||
3546 | !CI->getCapturedVar()->getType()->isAnyPointerType()) { | |||
3547 | Arg = castValueToType(CGF, Arg, ElemTy, CGFContext.getUIntPtrType(), | |||
3548 | CI->getLocation()); | |||
3549 | } | |||
3550 | Args.emplace_back(Arg); | |||
3551 | } | |||
3552 | } | |||
3553 | ||||
3554 | emitOutlinedFunctionCall(CGF, D.getBeginLoc(), OutlinedParallelFn, Args); | |||
3555 | CGF.FinishFunction(); | |||
3556 | return Fn; | |||
3557 | } | |||
3558 | ||||
3559 | void CGOpenMPRuntimeGPU::emitFunctionProlog(CodeGenFunction &CGF, | |||
3560 | const Decl *D) { | |||
3561 | if (getDataSharingMode(CGM) != CGOpenMPRuntimeGPU::Generic) | |||
3562 | return; | |||
3563 | ||||
3564 | assert(D && "Expected function or captured|block decl.")(static_cast <bool> (D && "Expected function or captured|block decl." ) ? void (0) : __assert_fail ("D && \"Expected function or captured|block decl.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 3564, __extension__ __PRETTY_FUNCTION__)); | |||
3565 | assert(FunctionGlobalizedDecls.count(CGF.CurFn) == 0 &&(static_cast <bool> (FunctionGlobalizedDecls.count(CGF. CurFn) == 0 && "Function is registered already.") ? void (0) : __assert_fail ("FunctionGlobalizedDecls.count(CGF.CurFn) == 0 && \"Function is registered already.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 3566, __extension__ __PRETTY_FUNCTION__)) | |||
3566 | "Function is registered already.")(static_cast <bool> (FunctionGlobalizedDecls.count(CGF. CurFn) == 0 && "Function is registered already.") ? void (0) : __assert_fail ("FunctionGlobalizedDecls.count(CGF.CurFn) == 0 && \"Function is registered already.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 3566, __extension__ __PRETTY_FUNCTION__)); | |||
3567 | assert((!TeamAndReductions.first || TeamAndReductions.first == D) &&(static_cast <bool> ((!TeamAndReductions.first || TeamAndReductions .first == D) && "Team is set but not processed.") ? void (0) : __assert_fail ("(!TeamAndReductions.first || TeamAndReductions.first == D) && \"Team is set but not processed.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 3568, __extension__ __PRETTY_FUNCTION__)) | |||
3568 | "Team is set but not processed.")(static_cast <bool> ((!TeamAndReductions.first || TeamAndReductions .first == D) && "Team is set but not processed.") ? void (0) : __assert_fail ("(!TeamAndReductions.first || TeamAndReductions.first == D) && \"Team is set but not processed.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 3568, __extension__ __PRETTY_FUNCTION__)); | |||
3569 | const Stmt *Body = nullptr; | |||
3570 | bool NeedToDelayGlobalization = false; | |||
3571 | if (const auto *FD = dyn_cast<FunctionDecl>(D)) { | |||
3572 | Body = FD->getBody(); | |||
3573 | } else if (const auto *BD = dyn_cast<BlockDecl>(D)) { | |||
3574 | Body = BD->getBody(); | |||
3575 | } else if (const auto *CD = dyn_cast<CapturedDecl>(D)) { | |||
3576 | Body = CD->getBody(); | |||
3577 | NeedToDelayGlobalization = CGF.CapturedStmtInfo->getKind() == CR_OpenMP; | |||
3578 | if (NeedToDelayGlobalization && | |||
3579 | getExecutionMode() == CGOpenMPRuntimeGPU::EM_SPMD) | |||
3580 | return; | |||
3581 | } | |||
3582 | if (!Body) | |||
3583 | return; | |||
3584 | CheckVarsEscapingDeclContext VarChecker(CGF, TeamAndReductions.second); | |||
3585 | VarChecker.Visit(Body); | |||
3586 | const RecordDecl *GlobalizedVarsRecord = | |||
3587 | VarChecker.getGlobalizedRecord(IsInTTDRegion); | |||
3588 | TeamAndReductions.first = nullptr; | |||
3589 | TeamAndReductions.second.clear(); | |||
3590 | ArrayRef<const ValueDecl *> EscapedVariableLengthDecls = | |||
3591 | VarChecker.getEscapedVariableLengthDecls(); | |||
3592 | if (!GlobalizedVarsRecord && EscapedVariableLengthDecls.empty()) | |||
3593 | return; | |||
3594 | auto I = FunctionGlobalizedDecls.try_emplace(CGF.CurFn).first; | |||
3595 | I->getSecond().MappedParams = | |||
3596 | std::make_unique<CodeGenFunction::OMPMapVars>(); | |||
3597 | I->getSecond().EscapedParameters.insert( | |||
3598 | VarChecker.getEscapedParameters().begin(), | |||
3599 | VarChecker.getEscapedParameters().end()); | |||
3600 | I->getSecond().EscapedVariableLengthDecls.append( | |||
3601 | EscapedVariableLengthDecls.begin(), EscapedVariableLengthDecls.end()); | |||
3602 | DeclToAddrMapTy &Data = I->getSecond().LocalVarData; | |||
3603 | for (const ValueDecl *VD : VarChecker.getEscapedDecls()) { | |||
3604 | assert(VD->isCanonicalDecl() && "Expected canonical declaration")(static_cast <bool> (VD->isCanonicalDecl() && "Expected canonical declaration") ? void (0) : __assert_fail ("VD->isCanonicalDecl() && \"Expected canonical declaration\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 3604, __extension__ __PRETTY_FUNCTION__)); | |||
3605 | Data.insert(std::make_pair(VD, MappedVarData())); | |||
3606 | } | |||
3607 | if (!IsInTTDRegion && !NeedToDelayGlobalization && !IsInParallelRegion) { | |||
3608 | CheckVarsEscapingDeclContext VarChecker(CGF, llvm::None); | |||
3609 | VarChecker.Visit(Body); | |||
3610 | I->getSecond().SecondaryLocalVarData.emplace(); | |||
3611 | DeclToAddrMapTy &Data = I->getSecond().SecondaryLocalVarData.getValue(); | |||
3612 | for (const ValueDecl *VD : VarChecker.getEscapedDecls()) { | |||
3613 | assert(VD->isCanonicalDecl() && "Expected canonical declaration")(static_cast <bool> (VD->isCanonicalDecl() && "Expected canonical declaration") ? void (0) : __assert_fail ("VD->isCanonicalDecl() && \"Expected canonical declaration\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 3613, __extension__ __PRETTY_FUNCTION__)); | |||
3614 | Data.insert(std::make_pair(VD, MappedVarData())); | |||
3615 | } | |||
3616 | } | |||
3617 | if (!NeedToDelayGlobalization) { | |||
3618 | emitGenericVarsProlog(CGF, D->getBeginLoc(), /*WithSPMDCheck=*/true); | |||
3619 | struct GlobalizationScope final : EHScopeStack::Cleanup { | |||
3620 | GlobalizationScope() = default; | |||
3621 | ||||
3622 | void Emit(CodeGenFunction &CGF, Flags flags) override { | |||
3623 | static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime()) | |||
3624 | .emitGenericVarsEpilog(CGF, /*WithSPMDCheck=*/true); | |||
3625 | } | |||
3626 | }; | |||
3627 | CGF.EHStack.pushCleanup<GlobalizationScope>(NormalAndEHCleanup); | |||
3628 | } | |||
3629 | } | |||
3630 | ||||
3631 | Address CGOpenMPRuntimeGPU::getAddressOfLocalVariable(CodeGenFunction &CGF, | |||
3632 | const VarDecl *VD) { | |||
3633 | if (VD && VD->hasAttr<OMPAllocateDeclAttr>()) { | |||
| ||||
3634 | const auto *A = VD->getAttr<OMPAllocateDeclAttr>(); | |||
3635 | auto AS = LangAS::Default; | |||
3636 | switch (A->getAllocatorType()) { | |||
3637 | // Use the default allocator here as by default local vars are | |||
3638 | // threadlocal. | |||
3639 | case OMPAllocateDeclAttr::OMPNullMemAlloc: | |||
3640 | case OMPAllocateDeclAttr::OMPDefaultMemAlloc: | |||
3641 | case OMPAllocateDeclAttr::OMPThreadMemAlloc: | |||
3642 | case OMPAllocateDeclAttr::OMPHighBWMemAlloc: | |||
3643 | case OMPAllocateDeclAttr::OMPLowLatMemAlloc: | |||
3644 | // Follow the user decision - use default allocation. | |||
3645 | return Address::invalid(); | |||
3646 | case OMPAllocateDeclAttr::OMPUserDefinedMemAlloc: | |||
3647 | // TODO: implement aupport for user-defined allocators. | |||
3648 | return Address::invalid(); | |||
3649 | case OMPAllocateDeclAttr::OMPConstMemAlloc: | |||
3650 | AS = LangAS::cuda_constant; | |||
3651 | break; | |||
3652 | case OMPAllocateDeclAttr::OMPPTeamMemAlloc: | |||
3653 | AS = LangAS::cuda_shared; | |||
3654 | break; | |||
3655 | case OMPAllocateDeclAttr::OMPLargeCapMemAlloc: | |||
3656 | case OMPAllocateDeclAttr::OMPCGroupMemAlloc: | |||
3657 | break; | |||
3658 | } | |||
3659 | llvm::Type *VarTy = CGF.ConvertTypeForMem(VD->getType()); | |||
3660 | auto *GV = new llvm::GlobalVariable( | |||
3661 | CGM.getModule(), VarTy, /*isConstant=*/false, | |||
3662 | llvm::GlobalValue::InternalLinkage, llvm::Constant::getNullValue(VarTy), | |||
3663 | VD->getName(), | |||
3664 | /*InsertBefore=*/nullptr, llvm::GlobalValue::NotThreadLocal, | |||
3665 | CGM.getContext().getTargetAddressSpace(AS)); | |||
3666 | CharUnits Align = CGM.getContext().getDeclAlign(VD); | |||
3667 | GV->setAlignment(Align.getAsAlign()); | |||
3668 | return Address( | |||
3669 | CGF.Builder.CreatePointerBitCastOrAddrSpaceCast( | |||
3670 | GV, VarTy->getPointerTo(CGM.getContext().getTargetAddressSpace( | |||
3671 | VD->getType().getAddressSpace()))), | |||
3672 | Align); | |||
3673 | } | |||
3674 | ||||
3675 | if (getDataSharingMode(CGM) != CGOpenMPRuntimeGPU::Generic) | |||
3676 | return Address::invalid(); | |||
3677 | ||||
3678 | VD = VD->getCanonicalDecl(); | |||
| ||||
3679 | auto I = FunctionGlobalizedDecls.find(CGF.CurFn); | |||
3680 | if (I == FunctionGlobalizedDecls.end()) | |||
3681 | return Address::invalid(); | |||
3682 | auto VDI = I->getSecond().LocalVarData.find(VD); | |||
3683 | if (VDI != I->getSecond().LocalVarData.end()) | |||
3684 | return VDI->second.PrivateAddr; | |||
3685 | if (VD->hasAttrs()) { | |||
3686 | for (specific_attr_iterator<OMPReferencedVarAttr> IT(VD->attr_begin()), | |||
3687 | E(VD->attr_end()); | |||
3688 | IT != E; ++IT) { | |||
3689 | auto VDI = I->getSecond().LocalVarData.find( | |||
3690 | cast<VarDecl>(cast<DeclRefExpr>(IT->getRef())->getDecl()) | |||
3691 | ->getCanonicalDecl()); | |||
3692 | if (VDI != I->getSecond().LocalVarData.end()) | |||
3693 | return VDI->second.PrivateAddr; | |||
3694 | } | |||
3695 | } | |||
3696 | ||||
3697 | return Address::invalid(); | |||
3698 | } | |||
3699 | ||||
3700 | void CGOpenMPRuntimeGPU::functionFinished(CodeGenFunction &CGF) { | |||
3701 | FunctionGlobalizedDecls.erase(CGF.CurFn); | |||
3702 | CGOpenMPRuntime::functionFinished(CGF); | |||
3703 | } | |||
3704 | ||||
3705 | void CGOpenMPRuntimeGPU::getDefaultDistScheduleAndChunk( | |||
3706 | CodeGenFunction &CGF, const OMPLoopDirective &S, | |||
3707 | OpenMPDistScheduleClauseKind &ScheduleKind, | |||
3708 | llvm::Value *&Chunk) const { | |||
3709 | auto &RT = static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime()); | |||
3710 | if (getExecutionMode() == CGOpenMPRuntimeGPU::EM_SPMD) { | |||
3711 | ScheduleKind = OMPC_DIST_SCHEDULE_static; | |||
3712 | Chunk = CGF.EmitScalarConversion( | |||
3713 | RT.getGPUNumThreads(CGF), | |||
3714 | CGF.getContext().getIntTypeForBitwidth(32, /*Signed=*/0), | |||
3715 | S.getIterationVariable()->getType(), S.getBeginLoc()); | |||
3716 | return; | |||
3717 | } | |||
3718 | CGOpenMPRuntime::getDefaultDistScheduleAndChunk( | |||
3719 | CGF, S, ScheduleKind, Chunk); | |||
3720 | } | |||
3721 | ||||
3722 | void CGOpenMPRuntimeGPU::getDefaultScheduleAndChunk( | |||
3723 | CodeGenFunction &CGF, const OMPLoopDirective &S, | |||
3724 | OpenMPScheduleClauseKind &ScheduleKind, | |||
3725 | const Expr *&ChunkExpr) const { | |||
3726 | ScheduleKind = OMPC_SCHEDULE_static; | |||
3727 | // Chunk size is 1 in this case. | |||
3728 | llvm::APInt ChunkSize(32, 1); | |||
3729 | ChunkExpr = IntegerLiteral::Create(CGF.getContext(), ChunkSize, | |||
3730 | CGF.getContext().getIntTypeForBitwidth(32, /*Signed=*/0), | |||
3731 | SourceLocation()); | |||
3732 | } | |||
3733 | ||||
3734 | void CGOpenMPRuntimeGPU::adjustTargetSpecificDataForLambdas( | |||
3735 | CodeGenFunction &CGF, const OMPExecutableDirective &D) const { | |||
3736 | assert(isOpenMPTargetExecutionDirective(D.getDirectiveKind()) &&(static_cast <bool> (isOpenMPTargetExecutionDirective(D .getDirectiveKind()) && " Expected target-based directive." ) ? void (0) : __assert_fail ("isOpenMPTargetExecutionDirective(D.getDirectiveKind()) && \" Expected target-based directive.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 3737, __extension__ __PRETTY_FUNCTION__)) | |||
3737 | " Expected target-based directive.")(static_cast <bool> (isOpenMPTargetExecutionDirective(D .getDirectiveKind()) && " Expected target-based directive." ) ? void (0) : __assert_fail ("isOpenMPTargetExecutionDirective(D.getDirectiveKind()) && \" Expected target-based directive.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 3737, __extension__ __PRETTY_FUNCTION__)); | |||
3738 | const CapturedStmt *CS = D.getCapturedStmt(OMPD_target); | |||
3739 | for (const CapturedStmt::Capture &C : CS->captures()) { | |||
3740 | // Capture variables captured by reference in lambdas for target-based | |||
3741 | // directives. | |||
3742 | if (!C.capturesVariable()) | |||
3743 | continue; | |||
3744 | const VarDecl *VD = C.getCapturedVar(); | |||
3745 | const auto *RD = VD->getType() | |||
3746 | .getCanonicalType() | |||
3747 | .getNonReferenceType() | |||
3748 | ->getAsCXXRecordDecl(); | |||
3749 | if (!RD || !RD->isLambda()) | |||
3750 | continue; | |||
3751 | Address VDAddr = CGF.GetAddrOfLocalVar(VD); | |||
3752 | LValue VDLVal; | |||
3753 | if (VD->getType().getCanonicalType()->isReferenceType()) | |||
3754 | VDLVal = CGF.EmitLoadOfReferenceLValue(VDAddr, VD->getType()); | |||
3755 | else | |||
3756 | VDLVal = CGF.MakeAddrLValue( | |||
3757 | VDAddr, VD->getType().getCanonicalType().getNonReferenceType()); | |||
3758 | llvm::DenseMap<const VarDecl *, FieldDecl *> Captures; | |||
3759 | FieldDecl *ThisCapture = nullptr; | |||
3760 | RD->getCaptureFields(Captures, ThisCapture); | |||
3761 | if (ThisCapture && CGF.CapturedStmtInfo->isCXXThisExprCaptured()) { | |||
3762 | LValue ThisLVal = | |||
3763 | CGF.EmitLValueForFieldInitialization(VDLVal, ThisCapture); | |||
3764 | llvm::Value *CXXThis = CGF.LoadCXXThis(); | |||
3765 | CGF.EmitStoreOfScalar(CXXThis, ThisLVal); | |||
3766 | } | |||
3767 | for (const LambdaCapture &LC : RD->captures()) { | |||
3768 | if (LC.getCaptureKind() != LCK_ByRef) | |||
3769 | continue; | |||
3770 | const VarDecl *VD = LC.getCapturedVar(); | |||
3771 | if (!CS->capturesVariable(VD)) | |||
3772 | continue; | |||
3773 | auto It = Captures.find(VD); | |||
3774 | assert(It != Captures.end() && "Found lambda capture without field.")(static_cast <bool> (It != Captures.end() && "Found lambda capture without field." ) ? void (0) : __assert_fail ("It != Captures.end() && \"Found lambda capture without field.\"" , "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 3774, __extension__ __PRETTY_FUNCTION__)); | |||
3775 | LValue VarLVal = CGF.EmitLValueForFieldInitialization(VDLVal, It->second); | |||
3776 | Address VDAddr = CGF.GetAddrOfLocalVar(VD); | |||
3777 | if (VD->getType().getCanonicalType()->isReferenceType()) | |||
3778 | VDAddr = CGF.EmitLoadOfReferenceLValue(VDAddr, | |||
3779 | VD->getType().getCanonicalType()) | |||
3780 | .getAddress(CGF); | |||
3781 | CGF.EmitStoreOfScalar(VDAddr.getPointer(), VarLVal); | |||
3782 | } | |||
3783 | } | |||
3784 | } | |||
3785 | ||||
3786 | bool CGOpenMPRuntimeGPU::hasAllocateAttributeForGlobalVar(const VarDecl *VD, | |||
3787 | LangAS &AS) { | |||
3788 | if (!VD || !VD->hasAttr<OMPAllocateDeclAttr>()) | |||
3789 | return false; | |||
3790 | const auto *A = VD->getAttr<OMPAllocateDeclAttr>(); | |||
3791 | switch(A->getAllocatorType()) { | |||
3792 | case OMPAllocateDeclAttr::OMPNullMemAlloc: | |||
3793 | case OMPAllocateDeclAttr::OMPDefaultMemAlloc: | |||
3794 | // Not supported, fallback to the default mem space. | |||
3795 | case OMPAllocateDeclAttr::OMPThreadMemAlloc: | |||
3796 | case OMPAllocateDeclAttr::OMPLargeCapMemAlloc: | |||
3797 | case OMPAllocateDeclAttr::OMPCGroupMemAlloc: | |||
3798 | case OMPAllocateDeclAttr::OMPHighBWMemAlloc: | |||
3799 | case OMPAllocateDeclAttr::OMPLowLatMemAlloc: | |||
3800 | AS = LangAS::Default; | |||
3801 | return true; | |||
3802 | case OMPAllocateDeclAttr::OMPConstMemAlloc: | |||
3803 | AS = LangAS::cuda_constant; | |||
3804 | return true; | |||
3805 | case OMPAllocateDeclAttr::OMPPTeamMemAlloc: | |||
3806 | AS = LangAS::cuda_shared; | |||
3807 | return true; | |||
3808 | case OMPAllocateDeclAttr::OMPUserDefinedMemAlloc: | |||
3809 | llvm_unreachable("Expected predefined allocator for the variables with the "::llvm::llvm_unreachable_internal("Expected predefined allocator for the variables with the " "static storage.", "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 3810) | |||
3810 | "static storage.")::llvm::llvm_unreachable_internal("Expected predefined allocator for the variables with the " "static storage.", "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 3810); | |||
3811 | } | |||
3812 | return false; | |||
3813 | } | |||
3814 | ||||
3815 | // Get current CudaArch and ignore any unknown values | |||
3816 | static CudaArch getCudaArch(CodeGenModule &CGM) { | |||
3817 | if (!CGM.getTarget().hasFeature("ptx")) | |||
3818 | return CudaArch::UNKNOWN; | |||
3819 | for (const auto &Feature : CGM.getTarget().getTargetOpts().FeatureMap) { | |||
3820 | if (Feature.getValue()) { | |||
3821 | CudaArch Arch = StringToCudaArch(Feature.getKey()); | |||
3822 | if (Arch != CudaArch::UNKNOWN) | |||
3823 | return Arch; | |||
3824 | } | |||
3825 | } | |||
3826 | return CudaArch::UNKNOWN; | |||
3827 | } | |||
3828 | ||||
3829 | /// Check to see if target architecture supports unified addressing which is | |||
3830 | /// a restriction for OpenMP requires clause "unified_shared_memory". | |||
3831 | void CGOpenMPRuntimeGPU::processRequiresDirective( | |||
3832 | const OMPRequiresDecl *D) { | |||
3833 | for (const OMPClause *Clause : D->clauselists()) { | |||
3834 | if (Clause->getClauseKind() == OMPC_unified_shared_memory) { | |||
3835 | CudaArch Arch = getCudaArch(CGM); | |||
3836 | switch (Arch) { | |||
3837 | case CudaArch::SM_20: | |||
3838 | case CudaArch::SM_21: | |||
3839 | case CudaArch::SM_30: | |||
3840 | case CudaArch::SM_32: | |||
3841 | case CudaArch::SM_35: | |||
3842 | case CudaArch::SM_37: | |||
3843 | case CudaArch::SM_50: | |||
3844 | case CudaArch::SM_52: | |||
3845 | case CudaArch::SM_53: { | |||
3846 | SmallString<256> Buffer; | |||
3847 | llvm::raw_svector_ostream Out(Buffer); | |||
3848 | Out << "Target architecture " << CudaArchToString(Arch) | |||
3849 | << " does not support unified addressing"; | |||
3850 | CGM.Error(Clause->getBeginLoc(), Out.str()); | |||
3851 | return; | |||
3852 | } | |||
3853 | case CudaArch::SM_60: | |||
3854 | case CudaArch::SM_61: | |||
3855 | case CudaArch::SM_62: | |||
3856 | case CudaArch::SM_70: | |||
3857 | case CudaArch::SM_72: | |||
3858 | case CudaArch::SM_75: | |||
3859 | case CudaArch::SM_80: | |||
3860 | case CudaArch::SM_86: | |||
3861 | case CudaArch::GFX600: | |||
3862 | case CudaArch::GFX601: | |||
3863 | case CudaArch::GFX602: | |||
3864 | case CudaArch::GFX700: | |||
3865 | case CudaArch::GFX701: | |||
3866 | case CudaArch::GFX702: | |||
3867 | case CudaArch::GFX703: | |||
3868 | case CudaArch::GFX704: | |||
3869 | case CudaArch::GFX705: | |||
3870 | case CudaArch::GFX801: | |||
3871 | case CudaArch::GFX802: | |||
3872 | case CudaArch::GFX803: | |||
3873 | case CudaArch::GFX805: | |||
3874 | case CudaArch::GFX810: | |||
3875 | case CudaArch::GFX900: | |||
3876 | case CudaArch::GFX902: | |||
3877 | case CudaArch::GFX904: | |||
3878 | case CudaArch::GFX906: | |||
3879 | case CudaArch::GFX908: | |||
3880 | case CudaArch::GFX909: | |||
3881 | case CudaArch::GFX90a: | |||
3882 | case CudaArch::GFX90c: | |||
3883 | case CudaArch::GFX1010: | |||
3884 | case CudaArch::GFX1011: | |||
3885 | case CudaArch::GFX1012: | |||
3886 | case CudaArch::GFX1013: | |||
3887 | case CudaArch::GFX1030: | |||
3888 | case CudaArch::GFX1031: | |||
3889 | case CudaArch::GFX1032: | |||
3890 | case CudaArch::GFX1033: | |||
3891 | case CudaArch::GFX1034: | |||
3892 | case CudaArch::GFX1035: | |||
3893 | case CudaArch::UNUSED: | |||
3894 | case CudaArch::UNKNOWN: | |||
3895 | break; | |||
3896 | case CudaArch::LAST: | |||
3897 | llvm_unreachable("Unexpected Cuda arch.")::llvm::llvm_unreachable_internal("Unexpected Cuda arch.", "/build/llvm-toolchain-snapshot-14~++20210828111110+16086d47c0d0/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp" , 3897); | |||
3898 | } | |||
3899 | } | |||
3900 | } | |||
3901 | CGOpenMPRuntime::processRequiresDirective(D); | |||
3902 | } | |||
3903 | ||||
3904 | void CGOpenMPRuntimeGPU::clear() { | |||
3905 | ||||
3906 | if (!TeamsReductions.empty()) { | |||
3907 | ASTContext &C = CGM.getContext(); | |||
3908 | RecordDecl *StaticRD = C.buildImplicitRecord( | |||
3909 | "_openmp_teams_reduction_type_$_", RecordDecl::TagKind::TTK_Union); | |||
3910 | StaticRD->startDefinition(); | |||
3911 | for (const RecordDecl *TeamReductionRec : TeamsReductions) { | |||
3912 | QualType RecTy = C.getRecordType(TeamReductionRec); | |||
3913 | auto *Field = FieldDecl::Create( | |||
3914 | C, StaticRD, SourceLocation(), SourceLocation(), nullptr, RecTy, | |||
3915 | C.getTrivialTypeSourceInfo(RecTy, SourceLocation()), | |||
3916 | /*BW=*/nullptr, /*Mutable=*/false, | |||
3917 | /*InitStyle=*/ICIS_NoInit); | |||
3918 | Field->setAccess(AS_public); | |||
3919 | StaticRD->addDecl(Field); | |||
3920 | } | |||
3921 | StaticRD->completeDefinition(); | |||
3922 | QualType StaticTy = C.getRecordType(StaticRD); | |||
3923 | llvm::Type *LLVMReductionsBufferTy = | |||
3924 | CGM.getTypes().ConvertTypeForMem(StaticTy); | |||
3925 | // FIXME: nvlink does not handle weak linkage correctly (object with the | |||
3926 | // different size are reported as erroneous). | |||
3927 | // Restore CommonLinkage as soon as nvlink is fixed. | |||
3928 | auto *GV = new llvm::GlobalVariable( | |||
3929 | CGM.getModule(), LLVMReductionsBufferTy, | |||
3930 | /*isConstant=*/false, llvm::GlobalValue::InternalLinkage, | |||
3931 | llvm::Constant::getNullValue(LLVMReductionsBufferTy), | |||
3932 | "_openmp_teams_reductions_buffer_$_"); | |||
3933 | KernelTeamsReductionPtr->setInitializer( | |||
3934 | llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(GV, | |||
3935 | CGM.VoidPtrTy)); | |||
3936 | } | |||
3937 | CGOpenMPRuntime::clear(); | |||
3938 | } |