File: | src/gnu/usr.bin/clang/libclangCodeGen/../../../llvm/clang/lib/CodeGen/CGOpenMPRuntimeGPU.cpp |
Warning: | line 1431, column 5 Value stored to 'Size' is never read |
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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 | |
26 | using namespace clang; |
27 | using namespace CodeGen; |
28 | using namespace llvm::omp; |
29 | |
30 | namespace { |
31 | /// Pre(post)-action for different OpenMP constructs specialized for NVPTX. |
32 | class NVPTXActionTy final : public PrePostActionTy { |
33 | llvm::FunctionCallee EnterCallee = nullptr; |
34 | ArrayRef<llvm::Value *> EnterArgs; |
35 | llvm::FunctionCallee ExitCallee = nullptr; |
36 | ArrayRef<llvm::Value *> ExitArgs; |
37 | bool Conditional = false; |
38 | llvm::BasicBlock *ContBlock = nullptr; |
39 | |
40 | public: |
41 | NVPTXActionTy(llvm::FunctionCallee EnterCallee, |
42 | ArrayRef<llvm::Value *> EnterArgs, |
43 | llvm::FunctionCallee ExitCallee, |
44 | ArrayRef<llvm::Value *> ExitArgs, bool Conditional = false) |
45 | : EnterCallee(EnterCallee), EnterArgs(EnterArgs), ExitCallee(ExitCallee), |
46 | ExitArgs(ExitArgs), Conditional(Conditional) {} |
47 | void Enter(CodeGenFunction &CGF) override { |
48 | llvm::Value *EnterRes = CGF.EmitRuntimeCall(EnterCallee, EnterArgs); |
49 | if (Conditional) { |
50 | llvm::Value *CallBool = CGF.Builder.CreateIsNotNull(EnterRes); |
51 | auto *ThenBlock = CGF.createBasicBlock("omp_if.then"); |
52 | ContBlock = CGF.createBasicBlock("omp_if.end"); |
53 | // Generate the branch (If-stmt) |
54 | CGF.Builder.CreateCondBr(CallBool, ThenBlock, ContBlock); |
55 | CGF.EmitBlock(ThenBlock); |
56 | } |
57 | } |
58 | void Done(CodeGenFunction &CGF) { |
59 | // Emit the rest of blocks/branches |
60 | CGF.EmitBranch(ContBlock); |
61 | CGF.EmitBlock(ContBlock, true); |
62 | } |
63 | void Exit(CodeGenFunction &CGF) override { |
64 | CGF.EmitRuntimeCall(ExitCallee, ExitArgs); |
65 | } |
66 | }; |
67 | |
68 | /// A class to track the execution mode when codegening directives within |
69 | /// a target region. The appropriate mode (SPMD|NON-SPMD) is set on entry |
70 | /// to the target region and used by containing directives such as 'parallel' |
71 | /// to emit optimized code. |
72 | class ExecutionRuntimeModesRAII { |
73 | private: |
74 | CGOpenMPRuntimeGPU::ExecutionMode SavedExecMode = |
75 | CGOpenMPRuntimeGPU::EM_Unknown; |
76 | CGOpenMPRuntimeGPU::ExecutionMode &ExecMode; |
77 | bool SavedRuntimeMode = false; |
78 | bool *RuntimeMode = nullptr; |
79 | |
80 | public: |
81 | /// Constructor for Non-SPMD mode. |
82 | ExecutionRuntimeModesRAII(CGOpenMPRuntimeGPU::ExecutionMode &ExecMode) |
83 | : ExecMode(ExecMode) { |
84 | SavedExecMode = ExecMode; |
85 | ExecMode = CGOpenMPRuntimeGPU::EM_NonSPMD; |
86 | } |
87 | /// Constructor for SPMD mode. |
88 | ExecutionRuntimeModesRAII(CGOpenMPRuntimeGPU::ExecutionMode &ExecMode, |
89 | bool &RuntimeMode, bool FullRuntimeMode) |
90 | : ExecMode(ExecMode), RuntimeMode(&RuntimeMode) { |
91 | SavedExecMode = ExecMode; |
92 | SavedRuntimeMode = RuntimeMode; |
93 | ExecMode = CGOpenMPRuntimeGPU::EM_SPMD; |
94 | RuntimeMode = FullRuntimeMode; |
95 | } |
96 | ~ExecutionRuntimeModesRAII() { |
97 | ExecMode = SavedExecMode; |
98 | if (RuntimeMode) |
99 | *RuntimeMode = SavedRuntimeMode; |
100 | } |
101 | }; |
102 | |
103 | /// GPU Configuration: This information can be derived from cuda registers, |
104 | /// however, providing compile time constants helps generate more efficient |
105 | /// code. For all practical purposes this is fine because the configuration |
106 | /// is the same for all known NVPTX architectures. |
107 | enum MachineConfiguration : unsigned { |
108 | /// See "llvm/Frontend/OpenMP/OMPGridValues.h" for various related target |
109 | /// specific Grid Values like GV_Warp_Size, GV_Warp_Size_Log2, |
110 | /// and GV_Warp_Size_Log2_Mask. |
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() &&((void)0) |
261 | "Parameter captured by value with variably modified type")((void)0); |
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.")__builtin_unreachable(); |
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 &&((void)0) |
340 | "Record for globalized variables is built already.")((void)0); |
341 | ArrayRef<const ValueDecl *> EscapedDeclsForParallel, EscapedDeclsForTeams; |
342 | unsigned WarpSize = CGF.getTarget().getGridValue(llvm::omp::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 &&((void)0) |
507 | "Record for globalized variables must be generated already.")((void)0); |
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 | CGF.getTarget().getGridValue(llvm::omp::GV_Warp_Size_Log2); |
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 LaneIDMask = CGF.getContext().getTargetInfo().getGridValue( |
550 | llvm::omp::GV_Warp_Size_Log2_Mask); |
551 | auto &RT = static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime()); |
552 | return Bld.CreateAnd(RT.getGPUThreadID(CGF), Bld.getInt32(LaneIDMask), |
553 | "nvptx_lane_id"); |
554 | } |
555 | |
556 | CGOpenMPRuntimeGPU::ExecutionMode |
557 | CGOpenMPRuntimeGPU::getExecutionMode() const { |
558 | return CurrentExecutionMode; |
559 | } |
560 | |
561 | static CGOpenMPRuntimeGPU::DataSharingMode |
562 | getDataSharingMode(CodeGenModule &CGM) { |
563 | return CGM.getLangOpts().OpenMPCUDAMode ? CGOpenMPRuntimeGPU::CUDA |
564 | : CGOpenMPRuntimeGPU::Generic; |
565 | } |
566 | |
567 | /// Check for inner (nested) SPMD construct, if any |
568 | static bool hasNestedSPMDDirective(ASTContext &Ctx, |
569 | const OMPExecutableDirective &D) { |
570 | const auto *CS = D.getInnermostCapturedStmt(); |
571 | const auto *Body = |
572 | CS->getCapturedStmt()->IgnoreContainers(/*IgnoreCaptured=*/true); |
573 | const Stmt *ChildStmt = CGOpenMPRuntime::getSingleCompoundChild(Ctx, Body); |
574 | |
575 | if (const auto *NestedDir = |
576 | dyn_cast_or_null<OMPExecutableDirective>(ChildStmt)) { |
577 | OpenMPDirectiveKind DKind = NestedDir->getDirectiveKind(); |
578 | switch (D.getDirectiveKind()) { |
579 | case OMPD_target: |
580 | if (isOpenMPParallelDirective(DKind)) |
581 | return true; |
582 | if (DKind == OMPD_teams) { |
583 | Body = NestedDir->getInnermostCapturedStmt()->IgnoreContainers( |
584 | /*IgnoreCaptured=*/true); |
585 | if (!Body) |
586 | return false; |
587 | ChildStmt = CGOpenMPRuntime::getSingleCompoundChild(Ctx, Body); |
588 | if (const auto *NND = |
589 | dyn_cast_or_null<OMPExecutableDirective>(ChildStmt)) { |
590 | DKind = NND->getDirectiveKind(); |
591 | if (isOpenMPParallelDirective(DKind)) |
592 | return true; |
593 | } |
594 | } |
595 | return false; |
596 | case OMPD_target_teams: |
597 | return isOpenMPParallelDirective(DKind); |
598 | case OMPD_target_simd: |
599 | case OMPD_target_parallel: |
600 | case OMPD_target_parallel_for: |
601 | case OMPD_target_parallel_for_simd: |
602 | case OMPD_target_teams_distribute: |
603 | case OMPD_target_teams_distribute_simd: |
604 | case OMPD_target_teams_distribute_parallel_for: |
605 | case OMPD_target_teams_distribute_parallel_for_simd: |
606 | case OMPD_parallel: |
607 | case OMPD_for: |
608 | case OMPD_parallel_for: |
609 | case OMPD_parallel_master: |
610 | case OMPD_parallel_sections: |
611 | case OMPD_for_simd: |
612 | case OMPD_parallel_for_simd: |
613 | case OMPD_cancel: |
614 | case OMPD_cancellation_point: |
615 | case OMPD_ordered: |
616 | case OMPD_threadprivate: |
617 | case OMPD_allocate: |
618 | case OMPD_task: |
619 | case OMPD_simd: |
620 | case OMPD_sections: |
621 | case OMPD_section: |
622 | case OMPD_single: |
623 | case OMPD_master: |
624 | case OMPD_critical: |
625 | case OMPD_taskyield: |
626 | case OMPD_barrier: |
627 | case OMPD_taskwait: |
628 | case OMPD_taskgroup: |
629 | case OMPD_atomic: |
630 | case OMPD_flush: |
631 | case OMPD_depobj: |
632 | case OMPD_scan: |
633 | case OMPD_teams: |
634 | case OMPD_target_data: |
635 | case OMPD_target_exit_data: |
636 | case OMPD_target_enter_data: |
637 | case OMPD_distribute: |
638 | case OMPD_distribute_simd: |
639 | case OMPD_distribute_parallel_for: |
640 | case OMPD_distribute_parallel_for_simd: |
641 | case OMPD_teams_distribute: |
642 | case OMPD_teams_distribute_simd: |
643 | case OMPD_teams_distribute_parallel_for: |
644 | case OMPD_teams_distribute_parallel_for_simd: |
645 | case OMPD_target_update: |
646 | case OMPD_declare_simd: |
647 | case OMPD_declare_variant: |
648 | case OMPD_begin_declare_variant: |
649 | case OMPD_end_declare_variant: |
650 | case OMPD_declare_target: |
651 | case OMPD_end_declare_target: |
652 | case OMPD_declare_reduction: |
653 | case OMPD_declare_mapper: |
654 | case OMPD_taskloop: |
655 | case OMPD_taskloop_simd: |
656 | case OMPD_master_taskloop: |
657 | case OMPD_master_taskloop_simd: |
658 | case OMPD_parallel_master_taskloop: |
659 | case OMPD_parallel_master_taskloop_simd: |
660 | case OMPD_requires: |
661 | case OMPD_unknown: |
662 | default: |
663 | llvm_unreachable("Unexpected directive.")__builtin_unreachable(); |
664 | } |
665 | } |
666 | |
667 | return false; |
668 | } |
669 | |
670 | static bool supportsSPMDExecutionMode(ASTContext &Ctx, |
671 | const OMPExecutableDirective &D) { |
672 | OpenMPDirectiveKind DirectiveKind = D.getDirectiveKind(); |
673 | switch (DirectiveKind) { |
674 | case OMPD_target: |
675 | case OMPD_target_teams: |
676 | return hasNestedSPMDDirective(Ctx, D); |
677 | case OMPD_target_parallel: |
678 | case OMPD_target_parallel_for: |
679 | case OMPD_target_parallel_for_simd: |
680 | case OMPD_target_teams_distribute_parallel_for: |
681 | case OMPD_target_teams_distribute_parallel_for_simd: |
682 | case OMPD_target_simd: |
683 | case OMPD_target_teams_distribute_simd: |
684 | return true; |
685 | case OMPD_target_teams_distribute: |
686 | return false; |
687 | case OMPD_parallel: |
688 | case OMPD_for: |
689 | case OMPD_parallel_for: |
690 | case OMPD_parallel_master: |
691 | case OMPD_parallel_sections: |
692 | case OMPD_for_simd: |
693 | case OMPD_parallel_for_simd: |
694 | case OMPD_cancel: |
695 | case OMPD_cancellation_point: |
696 | case OMPD_ordered: |
697 | case OMPD_threadprivate: |
698 | case OMPD_allocate: |
699 | case OMPD_task: |
700 | case OMPD_simd: |
701 | case OMPD_sections: |
702 | case OMPD_section: |
703 | case OMPD_single: |
704 | case OMPD_master: |
705 | case OMPD_critical: |
706 | case OMPD_taskyield: |
707 | case OMPD_barrier: |
708 | case OMPD_taskwait: |
709 | case OMPD_taskgroup: |
710 | case OMPD_atomic: |
711 | case OMPD_flush: |
712 | case OMPD_depobj: |
713 | case OMPD_scan: |
714 | case OMPD_teams: |
715 | case OMPD_target_data: |
716 | case OMPD_target_exit_data: |
717 | case OMPD_target_enter_data: |
718 | case OMPD_distribute: |
719 | case OMPD_distribute_simd: |
720 | case OMPD_distribute_parallel_for: |
721 | case OMPD_distribute_parallel_for_simd: |
722 | case OMPD_teams_distribute: |
723 | case OMPD_teams_distribute_simd: |
724 | case OMPD_teams_distribute_parallel_for: |
725 | case OMPD_teams_distribute_parallel_for_simd: |
726 | case OMPD_target_update: |
727 | case OMPD_declare_simd: |
728 | case OMPD_declare_variant: |
729 | case OMPD_begin_declare_variant: |
730 | case OMPD_end_declare_variant: |
731 | case OMPD_declare_target: |
732 | case OMPD_end_declare_target: |
733 | case OMPD_declare_reduction: |
734 | case OMPD_declare_mapper: |
735 | case OMPD_taskloop: |
736 | case OMPD_taskloop_simd: |
737 | case OMPD_master_taskloop: |
738 | case OMPD_master_taskloop_simd: |
739 | case OMPD_parallel_master_taskloop: |
740 | case OMPD_parallel_master_taskloop_simd: |
741 | case OMPD_requires: |
742 | case OMPD_unknown: |
743 | default: |
744 | break; |
745 | } |
746 | llvm_unreachable(__builtin_unreachable() |
747 | "Unknown programming model for OpenMP directive on NVPTX target.")__builtin_unreachable(); |
748 | } |
749 | |
750 | /// Check if the directive is loops based and has schedule clause at all or has |
751 | /// static scheduling. |
752 | static bool hasStaticScheduling(const OMPExecutableDirective &D) { |
753 | assert(isOpenMPWorksharingDirective(D.getDirectiveKind()) &&((void)0) |
754 | isOpenMPLoopDirective(D.getDirectiveKind()) &&((void)0) |
755 | "Expected loop-based directive.")((void)0); |
756 | return !D.hasClausesOfKind<OMPOrderedClause>() && |
757 | (!D.hasClausesOfKind<OMPScheduleClause>() || |
758 | llvm::any_of(D.getClausesOfKind<OMPScheduleClause>(), |
759 | [](const OMPScheduleClause *C) { |
760 | return C->getScheduleKind() == OMPC_SCHEDULE_static; |
761 | })); |
762 | } |
763 | |
764 | /// Check for inner (nested) lightweight runtime construct, if any |
765 | static bool hasNestedLightweightDirective(ASTContext &Ctx, |
766 | const OMPExecutableDirective &D) { |
767 | assert(supportsSPMDExecutionMode(Ctx, D) && "Expected SPMD mode directive.")((void)0); |
768 | const auto *CS = D.getInnermostCapturedStmt(); |
769 | const auto *Body = |
770 | CS->getCapturedStmt()->IgnoreContainers(/*IgnoreCaptured=*/true); |
771 | const Stmt *ChildStmt = CGOpenMPRuntime::getSingleCompoundChild(Ctx, Body); |
772 | |
773 | if (const auto *NestedDir = |
774 | dyn_cast_or_null<OMPExecutableDirective>(ChildStmt)) { |
775 | OpenMPDirectiveKind DKind = NestedDir->getDirectiveKind(); |
776 | switch (D.getDirectiveKind()) { |
777 | case OMPD_target: |
778 | if (isOpenMPParallelDirective(DKind) && |
779 | isOpenMPWorksharingDirective(DKind) && isOpenMPLoopDirective(DKind) && |
780 | hasStaticScheduling(*NestedDir)) |
781 | return true; |
782 | if (DKind == OMPD_teams_distribute_simd || DKind == OMPD_simd) |
783 | return true; |
784 | if (DKind == OMPD_parallel) { |
785 | Body = NestedDir->getInnermostCapturedStmt()->IgnoreContainers( |
786 | /*IgnoreCaptured=*/true); |
787 | if (!Body) |
788 | return false; |
789 | ChildStmt = CGOpenMPRuntime::getSingleCompoundChild(Ctx, Body); |
790 | if (const auto *NND = |
791 | dyn_cast_or_null<OMPExecutableDirective>(ChildStmt)) { |
792 | DKind = NND->getDirectiveKind(); |
793 | if (isOpenMPWorksharingDirective(DKind) && |
794 | isOpenMPLoopDirective(DKind) && hasStaticScheduling(*NND)) |
795 | return true; |
796 | } |
797 | } else if (DKind == OMPD_teams) { |
798 | Body = NestedDir->getInnermostCapturedStmt()->IgnoreContainers( |
799 | /*IgnoreCaptured=*/true); |
800 | if (!Body) |
801 | return false; |
802 | ChildStmt = CGOpenMPRuntime::getSingleCompoundChild(Ctx, Body); |
803 | if (const auto *NND = |
804 | dyn_cast_or_null<OMPExecutableDirective>(ChildStmt)) { |
805 | DKind = NND->getDirectiveKind(); |
806 | if (isOpenMPParallelDirective(DKind) && |
807 | isOpenMPWorksharingDirective(DKind) && |
808 | isOpenMPLoopDirective(DKind) && hasStaticScheduling(*NND)) |
809 | return true; |
810 | if (DKind == OMPD_parallel) { |
811 | Body = NND->getInnermostCapturedStmt()->IgnoreContainers( |
812 | /*IgnoreCaptured=*/true); |
813 | if (!Body) |
814 | return false; |
815 | ChildStmt = CGOpenMPRuntime::getSingleCompoundChild(Ctx, Body); |
816 | if (const auto *NND = |
817 | dyn_cast_or_null<OMPExecutableDirective>(ChildStmt)) { |
818 | DKind = NND->getDirectiveKind(); |
819 | if (isOpenMPWorksharingDirective(DKind) && |
820 | isOpenMPLoopDirective(DKind) && hasStaticScheduling(*NND)) |
821 | return true; |
822 | } |
823 | } |
824 | } |
825 | } |
826 | return false; |
827 | case OMPD_target_teams: |
828 | if (isOpenMPParallelDirective(DKind) && |
829 | isOpenMPWorksharingDirective(DKind) && isOpenMPLoopDirective(DKind) && |
830 | hasStaticScheduling(*NestedDir)) |
831 | return true; |
832 | if (DKind == OMPD_distribute_simd || DKind == OMPD_simd) |
833 | return true; |
834 | if (DKind == OMPD_parallel) { |
835 | Body = NestedDir->getInnermostCapturedStmt()->IgnoreContainers( |
836 | /*IgnoreCaptured=*/true); |
837 | if (!Body) |
838 | return false; |
839 | ChildStmt = CGOpenMPRuntime::getSingleCompoundChild(Ctx, Body); |
840 | if (const auto *NND = |
841 | dyn_cast_or_null<OMPExecutableDirective>(ChildStmt)) { |
842 | DKind = NND->getDirectiveKind(); |
843 | if (isOpenMPWorksharingDirective(DKind) && |
844 | isOpenMPLoopDirective(DKind) && hasStaticScheduling(*NND)) |
845 | return true; |
846 | } |
847 | } |
848 | return false; |
849 | case OMPD_target_parallel: |
850 | if (DKind == OMPD_simd) |
851 | return true; |
852 | return isOpenMPWorksharingDirective(DKind) && |
853 | isOpenMPLoopDirective(DKind) && hasStaticScheduling(*NestedDir); |
854 | case OMPD_target_teams_distribute: |
855 | case OMPD_target_simd: |
856 | case OMPD_target_parallel_for: |
857 | case OMPD_target_parallel_for_simd: |
858 | case OMPD_target_teams_distribute_simd: |
859 | case OMPD_target_teams_distribute_parallel_for: |
860 | case OMPD_target_teams_distribute_parallel_for_simd: |
861 | case OMPD_parallel: |
862 | case OMPD_for: |
863 | case OMPD_parallel_for: |
864 | case OMPD_parallel_master: |
865 | case OMPD_parallel_sections: |
866 | case OMPD_for_simd: |
867 | case OMPD_parallel_for_simd: |
868 | case OMPD_cancel: |
869 | case OMPD_cancellation_point: |
870 | case OMPD_ordered: |
871 | case OMPD_threadprivate: |
872 | case OMPD_allocate: |
873 | case OMPD_task: |
874 | case OMPD_simd: |
875 | case OMPD_sections: |
876 | case OMPD_section: |
877 | case OMPD_single: |
878 | case OMPD_master: |
879 | case OMPD_critical: |
880 | case OMPD_taskyield: |
881 | case OMPD_barrier: |
882 | case OMPD_taskwait: |
883 | case OMPD_taskgroup: |
884 | case OMPD_atomic: |
885 | case OMPD_flush: |
886 | case OMPD_depobj: |
887 | case OMPD_scan: |
888 | case OMPD_teams: |
889 | case OMPD_target_data: |
890 | case OMPD_target_exit_data: |
891 | case OMPD_target_enter_data: |
892 | case OMPD_distribute: |
893 | case OMPD_distribute_simd: |
894 | case OMPD_distribute_parallel_for: |
895 | case OMPD_distribute_parallel_for_simd: |
896 | case OMPD_teams_distribute: |
897 | case OMPD_teams_distribute_simd: |
898 | case OMPD_teams_distribute_parallel_for: |
899 | case OMPD_teams_distribute_parallel_for_simd: |
900 | case OMPD_target_update: |
901 | case OMPD_declare_simd: |
902 | case OMPD_declare_variant: |
903 | case OMPD_begin_declare_variant: |
904 | case OMPD_end_declare_variant: |
905 | case OMPD_declare_target: |
906 | case OMPD_end_declare_target: |
907 | case OMPD_declare_reduction: |
908 | case OMPD_declare_mapper: |
909 | case OMPD_taskloop: |
910 | case OMPD_taskloop_simd: |
911 | case OMPD_master_taskloop: |
912 | case OMPD_master_taskloop_simd: |
913 | case OMPD_parallel_master_taskloop: |
914 | case OMPD_parallel_master_taskloop_simd: |
915 | case OMPD_requires: |
916 | case OMPD_unknown: |
917 | default: |
918 | llvm_unreachable("Unexpected directive.")__builtin_unreachable(); |
919 | } |
920 | } |
921 | |
922 | return false; |
923 | } |
924 | |
925 | /// Checks if the construct supports lightweight runtime. It must be SPMD |
926 | /// construct + inner loop-based construct with static scheduling. |
927 | static bool supportsLightweightRuntime(ASTContext &Ctx, |
928 | const OMPExecutableDirective &D) { |
929 | if (!supportsSPMDExecutionMode(Ctx, D)) |
930 | return false; |
931 | OpenMPDirectiveKind DirectiveKind = D.getDirectiveKind(); |
932 | switch (DirectiveKind) { |
933 | case OMPD_target: |
934 | case OMPD_target_teams: |
935 | case OMPD_target_parallel: |
936 | return hasNestedLightweightDirective(Ctx, D); |
937 | case OMPD_target_parallel_for: |
938 | case OMPD_target_parallel_for_simd: |
939 | case OMPD_target_teams_distribute_parallel_for: |
940 | case OMPD_target_teams_distribute_parallel_for_simd: |
941 | // (Last|First)-privates must be shared in parallel region. |
942 | return hasStaticScheduling(D); |
943 | case OMPD_target_simd: |
944 | case OMPD_target_teams_distribute_simd: |
945 | return true; |
946 | case OMPD_target_teams_distribute: |
947 | return false; |
948 | case OMPD_parallel: |
949 | case OMPD_for: |
950 | case OMPD_parallel_for: |
951 | case OMPD_parallel_master: |
952 | case OMPD_parallel_sections: |
953 | case OMPD_for_simd: |
954 | case OMPD_parallel_for_simd: |
955 | case OMPD_cancel: |
956 | case OMPD_cancellation_point: |
957 | case OMPD_ordered: |
958 | case OMPD_threadprivate: |
959 | case OMPD_allocate: |
960 | case OMPD_task: |
961 | case OMPD_simd: |
962 | case OMPD_sections: |
963 | case OMPD_section: |
964 | case OMPD_single: |
965 | case OMPD_master: |
966 | case OMPD_critical: |
967 | case OMPD_taskyield: |
968 | case OMPD_barrier: |
969 | case OMPD_taskwait: |
970 | case OMPD_taskgroup: |
971 | case OMPD_atomic: |
972 | case OMPD_flush: |
973 | case OMPD_depobj: |
974 | case OMPD_scan: |
975 | case OMPD_teams: |
976 | case OMPD_target_data: |
977 | case OMPD_target_exit_data: |
978 | case OMPD_target_enter_data: |
979 | case OMPD_distribute: |
980 | case OMPD_distribute_simd: |
981 | case OMPD_distribute_parallel_for: |
982 | case OMPD_distribute_parallel_for_simd: |
983 | case OMPD_teams_distribute: |
984 | case OMPD_teams_distribute_simd: |
985 | case OMPD_teams_distribute_parallel_for: |
986 | case OMPD_teams_distribute_parallel_for_simd: |
987 | case OMPD_target_update: |
988 | case OMPD_declare_simd: |
989 | case OMPD_declare_variant: |
990 | case OMPD_begin_declare_variant: |
991 | case OMPD_end_declare_variant: |
992 | case OMPD_declare_target: |
993 | case OMPD_end_declare_target: |
994 | case OMPD_declare_reduction: |
995 | case OMPD_declare_mapper: |
996 | case OMPD_taskloop: |
997 | case OMPD_taskloop_simd: |
998 | case OMPD_master_taskloop: |
999 | case OMPD_master_taskloop_simd: |
1000 | case OMPD_parallel_master_taskloop: |
1001 | case OMPD_parallel_master_taskloop_simd: |
1002 | case OMPD_requires: |
1003 | case OMPD_unknown: |
1004 | default: |
1005 | break; |
1006 | } |
1007 | llvm_unreachable(__builtin_unreachable() |
1008 | "Unknown programming model for OpenMP directive on NVPTX target.")__builtin_unreachable(); |
1009 | } |
1010 | |
1011 | void CGOpenMPRuntimeGPU::emitNonSPMDKernel(const OMPExecutableDirective &D, |
1012 | StringRef ParentName, |
1013 | llvm::Function *&OutlinedFn, |
1014 | llvm::Constant *&OutlinedFnID, |
1015 | bool IsOffloadEntry, |
1016 | const RegionCodeGenTy &CodeGen) { |
1017 | ExecutionRuntimeModesRAII ModeRAII(CurrentExecutionMode); |
1018 | EntryFunctionState EST; |
1019 | WrapperFunctionsMap.clear(); |
1020 | |
1021 | // Emit target region as a standalone region. |
1022 | class NVPTXPrePostActionTy : public PrePostActionTy { |
1023 | CGOpenMPRuntimeGPU::EntryFunctionState &EST; |
1024 | |
1025 | public: |
1026 | NVPTXPrePostActionTy(CGOpenMPRuntimeGPU::EntryFunctionState &EST) |
1027 | : EST(EST) {} |
1028 | void Enter(CodeGenFunction &CGF) override { |
1029 | auto &RT = |
1030 | static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime()); |
1031 | RT.emitKernelInit(CGF, EST, /* IsSPMD */ false); |
1032 | // Skip target region initialization. |
1033 | RT.setLocThreadIdInsertPt(CGF, /*AtCurrentPoint=*/true); |
1034 | } |
1035 | void Exit(CodeGenFunction &CGF) override { |
1036 | auto &RT = |
1037 | static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime()); |
1038 | RT.clearLocThreadIdInsertPt(CGF); |
1039 | RT.emitKernelDeinit(CGF, EST, /* IsSPMD */ false); |
1040 | } |
1041 | } Action(EST); |
1042 | CodeGen.setAction(Action); |
1043 | IsInTTDRegion = true; |
1044 | emitTargetOutlinedFunctionHelper(D, ParentName, OutlinedFn, OutlinedFnID, |
1045 | IsOffloadEntry, CodeGen); |
1046 | IsInTTDRegion = false; |
1047 | } |
1048 | |
1049 | void CGOpenMPRuntimeGPU::emitKernelInit(CodeGenFunction &CGF, |
1050 | EntryFunctionState &EST, bool IsSPMD) { |
1051 | CGBuilderTy &Bld = CGF.Builder; |
1052 | Bld.restoreIP(OMPBuilder.createTargetInit(Bld, IsSPMD, requiresFullRuntime())); |
1053 | IsInTargetMasterThreadRegion = IsSPMD; |
1054 | if (!IsSPMD) |
1055 | emitGenericVarsProlog(CGF, EST.Loc); |
1056 | } |
1057 | |
1058 | void CGOpenMPRuntimeGPU::emitKernelDeinit(CodeGenFunction &CGF, |
1059 | EntryFunctionState &EST, |
1060 | bool IsSPMD) { |
1061 | if (!IsSPMD) |
1062 | emitGenericVarsEpilog(CGF); |
1063 | |
1064 | CGBuilderTy &Bld = CGF.Builder; |
1065 | OMPBuilder.createTargetDeinit(Bld, IsSPMD, requiresFullRuntime()); |
1066 | } |
1067 | |
1068 | void CGOpenMPRuntimeGPU::emitSPMDKernel(const OMPExecutableDirective &D, |
1069 | StringRef ParentName, |
1070 | llvm::Function *&OutlinedFn, |
1071 | llvm::Constant *&OutlinedFnID, |
1072 | bool IsOffloadEntry, |
1073 | const RegionCodeGenTy &CodeGen) { |
1074 | ExecutionRuntimeModesRAII ModeRAII( |
1075 | CurrentExecutionMode, RequiresFullRuntime, |
1076 | CGM.getLangOpts().OpenMPCUDAForceFullRuntime || |
1077 | !supportsLightweightRuntime(CGM.getContext(), D)); |
1078 | EntryFunctionState EST; |
1079 | |
1080 | // Emit target region as a standalone region. |
1081 | class NVPTXPrePostActionTy : public PrePostActionTy { |
1082 | CGOpenMPRuntimeGPU &RT; |
1083 | CGOpenMPRuntimeGPU::EntryFunctionState &EST; |
1084 | |
1085 | public: |
1086 | NVPTXPrePostActionTy(CGOpenMPRuntimeGPU &RT, |
1087 | CGOpenMPRuntimeGPU::EntryFunctionState &EST) |
1088 | : RT(RT), EST(EST) {} |
1089 | void Enter(CodeGenFunction &CGF) override { |
1090 | RT.emitKernelInit(CGF, EST, /* IsSPMD */ true); |
1091 | // Skip target region initialization. |
1092 | RT.setLocThreadIdInsertPt(CGF, /*AtCurrentPoint=*/true); |
1093 | } |
1094 | void Exit(CodeGenFunction &CGF) override { |
1095 | RT.clearLocThreadIdInsertPt(CGF); |
1096 | RT.emitKernelDeinit(CGF, EST, /* IsSPMD */ true); |
1097 | } |
1098 | } Action(*this, EST); |
1099 | CodeGen.setAction(Action); |
1100 | IsInTTDRegion = true; |
1101 | emitTargetOutlinedFunctionHelper(D, ParentName, OutlinedFn, OutlinedFnID, |
1102 | IsOffloadEntry, CodeGen); |
1103 | IsInTTDRegion = false; |
1104 | } |
1105 | |
1106 | // Create a unique global variable to indicate the execution mode of this target |
1107 | // region. The execution mode is either 'generic', or 'spmd' depending on the |
1108 | // target directive. This variable is picked up by the offload library to setup |
1109 | // the device appropriately before kernel launch. If the execution mode is |
1110 | // 'generic', the runtime reserves one warp for the master, otherwise, all |
1111 | // warps participate in parallel work. |
1112 | static void setPropertyExecutionMode(CodeGenModule &CGM, StringRef Name, |
1113 | bool Mode) { |
1114 | auto *GVMode = |
1115 | new llvm::GlobalVariable(CGM.getModule(), CGM.Int8Ty, /*isConstant=*/true, |
1116 | llvm::GlobalValue::WeakAnyLinkage, |
1117 | llvm::ConstantInt::get(CGM.Int8Ty, Mode ? 0 : 1), |
1118 | Twine(Name, "_exec_mode")); |
1119 | CGM.addCompilerUsedGlobal(GVMode); |
1120 | } |
1121 | |
1122 | void CGOpenMPRuntimeGPU::createOffloadEntry(llvm::Constant *ID, |
1123 | llvm::Constant *Addr, |
1124 | uint64_t Size, int32_t, |
1125 | llvm::GlobalValue::LinkageTypes) { |
1126 | // TODO: Add support for global variables on the device after declare target |
1127 | // support. |
1128 | if (!isa<llvm::Function>(Addr)) |
1129 | return; |
1130 | llvm::Module &M = CGM.getModule(); |
1131 | llvm::LLVMContext &Ctx = CGM.getLLVMContext(); |
1132 | |
1133 | // Get "nvvm.annotations" metadata node |
1134 | llvm::NamedMDNode *MD = M.getOrInsertNamedMetadata("nvvm.annotations"); |
1135 | |
1136 | llvm::Metadata *MDVals[] = { |
1137 | llvm::ConstantAsMetadata::get(Addr), llvm::MDString::get(Ctx, "kernel"), |
1138 | llvm::ConstantAsMetadata::get( |
1139 | llvm::ConstantInt::get(llvm::Type::getInt32Ty(Ctx), 1))}; |
1140 | // Append metadata to nvvm.annotations |
1141 | MD->addOperand(llvm::MDNode::get(Ctx, MDVals)); |
1142 | } |
1143 | |
1144 | void CGOpenMPRuntimeGPU::emitTargetOutlinedFunction( |
1145 | const OMPExecutableDirective &D, StringRef ParentName, |
1146 | llvm::Function *&OutlinedFn, llvm::Constant *&OutlinedFnID, |
1147 | bool IsOffloadEntry, const RegionCodeGenTy &CodeGen) { |
1148 | if (!IsOffloadEntry) // Nothing to do. |
1149 | return; |
1150 | |
1151 | assert(!ParentName.empty() && "Invalid target region parent name!")((void)0); |
1152 | |
1153 | bool Mode = supportsSPMDExecutionMode(CGM.getContext(), D); |
1154 | if (Mode) |
1155 | emitSPMDKernel(D, ParentName, OutlinedFn, OutlinedFnID, IsOffloadEntry, |
1156 | CodeGen); |
1157 | else |
1158 | emitNonSPMDKernel(D, ParentName, OutlinedFn, OutlinedFnID, IsOffloadEntry, |
1159 | CodeGen); |
1160 | |
1161 | setPropertyExecutionMode(CGM, OutlinedFn->getName(), Mode); |
1162 | } |
1163 | |
1164 | namespace { |
1165 | 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^=; |
1166 | /// Enum for accesseing the reserved_2 field of the ident_t struct. |
1167 | enum ModeFlagsTy : unsigned { |
1168 | /// Bit set to 1 when in SPMD mode. |
1169 | KMP_IDENT_SPMD_MODE = 0x01, |
1170 | /// Bit set to 1 when a simplified runtime is used. |
1171 | KMP_IDENT_SIMPLE_RT_MODE = 0x02, |
1172 | LLVM_MARK_AS_BITMASK_ENUM(/*LargestValue=*/KMP_IDENT_SIMPLE_RT_MODE)LLVM_BITMASK_LARGEST_ENUMERATOR = KMP_IDENT_SIMPLE_RT_MODE |
1173 | }; |
1174 | |
1175 | /// Special mode Undefined. Is the combination of Non-SPMD mode + SimpleRuntime. |
1176 | static const ModeFlagsTy UndefinedMode = |
1177 | (~KMP_IDENT_SPMD_MODE) & KMP_IDENT_SIMPLE_RT_MODE; |
1178 | } // anonymous namespace |
1179 | |
1180 | unsigned CGOpenMPRuntimeGPU::getDefaultLocationReserved2Flags() const { |
1181 | switch (getExecutionMode()) { |
1182 | case EM_SPMD: |
1183 | if (requiresFullRuntime()) |
1184 | return KMP_IDENT_SPMD_MODE & (~KMP_IDENT_SIMPLE_RT_MODE); |
1185 | return KMP_IDENT_SPMD_MODE | KMP_IDENT_SIMPLE_RT_MODE; |
1186 | case EM_NonSPMD: |
1187 | assert(requiresFullRuntime() && "Expected full runtime.")((void)0); |
1188 | return (~KMP_IDENT_SPMD_MODE) & (~KMP_IDENT_SIMPLE_RT_MODE); |
1189 | case EM_Unknown: |
1190 | return UndefinedMode; |
1191 | } |
1192 | llvm_unreachable("Unknown flags are requested.")__builtin_unreachable(); |
1193 | } |
1194 | |
1195 | CGOpenMPRuntimeGPU::CGOpenMPRuntimeGPU(CodeGenModule &CGM) |
1196 | : CGOpenMPRuntime(CGM, "_", "$") { |
1197 | if (!CGM.getLangOpts().OpenMPIsDevice) |
1198 | llvm_unreachable("OpenMP NVPTX can only handle device code.")__builtin_unreachable(); |
1199 | } |
1200 | |
1201 | void CGOpenMPRuntimeGPU::emitProcBindClause(CodeGenFunction &CGF, |
1202 | ProcBindKind ProcBind, |
1203 | SourceLocation Loc) { |
1204 | // Do nothing in case of SPMD mode and L0 parallel. |
1205 | if (getExecutionMode() == CGOpenMPRuntimeGPU::EM_SPMD) |
1206 | return; |
1207 | |
1208 | CGOpenMPRuntime::emitProcBindClause(CGF, ProcBind, Loc); |
1209 | } |
1210 | |
1211 | void CGOpenMPRuntimeGPU::emitNumThreadsClause(CodeGenFunction &CGF, |
1212 | llvm::Value *NumThreads, |
1213 | SourceLocation Loc) { |
1214 | // Do nothing in case of SPMD mode and L0 parallel. |
1215 | if (getExecutionMode() == CGOpenMPRuntimeGPU::EM_SPMD) |
1216 | return; |
1217 | |
1218 | CGOpenMPRuntime::emitNumThreadsClause(CGF, NumThreads, Loc); |
1219 | } |
1220 | |
1221 | void CGOpenMPRuntimeGPU::emitNumTeamsClause(CodeGenFunction &CGF, |
1222 | const Expr *NumTeams, |
1223 | const Expr *ThreadLimit, |
1224 | SourceLocation Loc) {} |
1225 | |
1226 | llvm::Function *CGOpenMPRuntimeGPU::emitParallelOutlinedFunction( |
1227 | const OMPExecutableDirective &D, const VarDecl *ThreadIDVar, |
1228 | OpenMPDirectiveKind InnermostKind, const RegionCodeGenTy &CodeGen) { |
1229 | // Emit target region as a standalone region. |
1230 | class NVPTXPrePostActionTy : public PrePostActionTy { |
1231 | bool &IsInParallelRegion; |
1232 | bool PrevIsInParallelRegion; |
1233 | |
1234 | public: |
1235 | NVPTXPrePostActionTy(bool &IsInParallelRegion) |
1236 | : IsInParallelRegion(IsInParallelRegion) {} |
1237 | void Enter(CodeGenFunction &CGF) override { |
1238 | PrevIsInParallelRegion = IsInParallelRegion; |
1239 | IsInParallelRegion = true; |
1240 | } |
1241 | void Exit(CodeGenFunction &CGF) override { |
1242 | IsInParallelRegion = PrevIsInParallelRegion; |
1243 | } |
1244 | } Action(IsInParallelRegion); |
1245 | CodeGen.setAction(Action); |
1246 | bool PrevIsInTTDRegion = IsInTTDRegion; |
1247 | IsInTTDRegion = false; |
1248 | bool PrevIsInTargetMasterThreadRegion = IsInTargetMasterThreadRegion; |
1249 | IsInTargetMasterThreadRegion = false; |
1250 | auto *OutlinedFun = |
1251 | cast<llvm::Function>(CGOpenMPRuntime::emitParallelOutlinedFunction( |
1252 | D, ThreadIDVar, InnermostKind, CodeGen)); |
1253 | IsInTargetMasterThreadRegion = PrevIsInTargetMasterThreadRegion; |
1254 | IsInTTDRegion = PrevIsInTTDRegion; |
1255 | if (getExecutionMode() != CGOpenMPRuntimeGPU::EM_SPMD && |
1256 | !IsInParallelRegion) { |
1257 | llvm::Function *WrapperFun = |
1258 | createParallelDataSharingWrapper(OutlinedFun, D); |
1259 | WrapperFunctionsMap[OutlinedFun] = WrapperFun; |
1260 | } |
1261 | |
1262 | return OutlinedFun; |
1263 | } |
1264 | |
1265 | /// Get list of lastprivate variables from the teams distribute ... or |
1266 | /// teams {distribute ...} directives. |
1267 | static void |
1268 | getDistributeLastprivateVars(ASTContext &Ctx, const OMPExecutableDirective &D, |
1269 | llvm::SmallVectorImpl<const ValueDecl *> &Vars) { |
1270 | assert(isOpenMPTeamsDirective(D.getDirectiveKind()) &&((void)0) |
1271 | "expected teams directive.")((void)0); |
1272 | const OMPExecutableDirective *Dir = &D; |
1273 | if (!isOpenMPDistributeDirective(D.getDirectiveKind())) { |
1274 | if (const Stmt *S = CGOpenMPRuntime::getSingleCompoundChild( |
1275 | Ctx, |
1276 | D.getInnermostCapturedStmt()->getCapturedStmt()->IgnoreContainers( |
1277 | /*IgnoreCaptured=*/true))) { |
1278 | Dir = dyn_cast_or_null<OMPExecutableDirective>(S); |
1279 | if (Dir && !isOpenMPDistributeDirective(Dir->getDirectiveKind())) |
1280 | Dir = nullptr; |
1281 | } |
1282 | } |
1283 | if (!Dir) |
1284 | return; |
1285 | for (const auto *C : Dir->getClausesOfKind<OMPLastprivateClause>()) { |
1286 | for (const Expr *E : C->getVarRefs()) |
1287 | Vars.push_back(getPrivateItem(E)); |
1288 | } |
1289 | } |
1290 | |
1291 | /// Get list of reduction variables from the teams ... directives. |
1292 | static void |
1293 | getTeamsReductionVars(ASTContext &Ctx, const OMPExecutableDirective &D, |
1294 | llvm::SmallVectorImpl<const ValueDecl *> &Vars) { |
1295 | assert(isOpenMPTeamsDirective(D.getDirectiveKind()) &&((void)0) |
1296 | "expected teams directive.")((void)0); |
1297 | for (const auto *C : D.getClausesOfKind<OMPReductionClause>()) { |
1298 | for (const Expr *E : C->privates()) |
1299 | Vars.push_back(getPrivateItem(E)); |
1300 | } |
1301 | } |
1302 | |
1303 | llvm::Function *CGOpenMPRuntimeGPU::emitTeamsOutlinedFunction( |
1304 | const OMPExecutableDirective &D, const VarDecl *ThreadIDVar, |
1305 | OpenMPDirectiveKind InnermostKind, const RegionCodeGenTy &CodeGen) { |
1306 | SourceLocation Loc = D.getBeginLoc(); |
1307 | |
1308 | const RecordDecl *GlobalizedRD = nullptr; |
1309 | llvm::SmallVector<const ValueDecl *, 4> LastPrivatesReductions; |
1310 | llvm::SmallDenseMap<const ValueDecl *, const FieldDecl *> MappedDeclsFields; |
1311 | unsigned WarpSize = CGM.getTarget().getGridValue(llvm::omp::GV_Warp_Size); |
1312 | // Globalize team reductions variable unconditionally in all modes. |
1313 | if (getExecutionMode() != CGOpenMPRuntimeGPU::EM_SPMD) |
1314 | getTeamsReductionVars(CGM.getContext(), D, LastPrivatesReductions); |
1315 | if (getExecutionMode() == CGOpenMPRuntimeGPU::EM_SPMD) { |
1316 | getDistributeLastprivateVars(CGM.getContext(), D, LastPrivatesReductions); |
1317 | if (!LastPrivatesReductions.empty()) { |
1318 | GlobalizedRD = ::buildRecordForGlobalizedVars( |
1319 | CGM.getContext(), llvm::None, LastPrivatesReductions, |
1320 | MappedDeclsFields, WarpSize); |
1321 | } |
1322 | } else if (!LastPrivatesReductions.empty()) { |
1323 | assert(!TeamAndReductions.first &&((void)0) |
1324 | "Previous team declaration is not expected.")((void)0); |
1325 | TeamAndReductions.first = D.getCapturedStmt(OMPD_teams)->getCapturedDecl(); |
1326 | std::swap(TeamAndReductions.second, LastPrivatesReductions); |
1327 | } |
1328 | |
1329 | // Emit target region as a standalone region. |
1330 | class NVPTXPrePostActionTy : public PrePostActionTy { |
1331 | SourceLocation &Loc; |
1332 | const RecordDecl *GlobalizedRD; |
1333 | llvm::SmallDenseMap<const ValueDecl *, const FieldDecl *> |
1334 | &MappedDeclsFields; |
1335 | |
1336 | public: |
1337 | NVPTXPrePostActionTy( |
1338 | SourceLocation &Loc, const RecordDecl *GlobalizedRD, |
1339 | llvm::SmallDenseMap<const ValueDecl *, const FieldDecl *> |
1340 | &MappedDeclsFields) |
1341 | : Loc(Loc), GlobalizedRD(GlobalizedRD), |
1342 | MappedDeclsFields(MappedDeclsFields) {} |
1343 | void Enter(CodeGenFunction &CGF) override { |
1344 | auto &Rt = |
1345 | static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime()); |
1346 | if (GlobalizedRD) { |
1347 | auto I = Rt.FunctionGlobalizedDecls.try_emplace(CGF.CurFn).first; |
1348 | I->getSecond().MappedParams = |
1349 | std::make_unique<CodeGenFunction::OMPMapVars>(); |
1350 | DeclToAddrMapTy &Data = I->getSecond().LocalVarData; |
1351 | for (const auto &Pair : MappedDeclsFields) { |
1352 | assert(Pair.getFirst()->isCanonicalDecl() &&((void)0) |
1353 | "Expected canonical declaration")((void)0); |
1354 | Data.insert(std::make_pair(Pair.getFirst(), MappedVarData())); |
1355 | } |
1356 | } |
1357 | Rt.emitGenericVarsProlog(CGF, Loc); |
1358 | } |
1359 | void Exit(CodeGenFunction &CGF) override { |
1360 | static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime()) |
1361 | .emitGenericVarsEpilog(CGF); |
1362 | } |
1363 | } Action(Loc, GlobalizedRD, MappedDeclsFields); |
1364 | CodeGen.setAction(Action); |
1365 | llvm::Function *OutlinedFun = CGOpenMPRuntime::emitTeamsOutlinedFunction( |
1366 | D, ThreadIDVar, InnermostKind, CodeGen); |
1367 | |
1368 | return OutlinedFun; |
1369 | } |
1370 | |
1371 | void CGOpenMPRuntimeGPU::emitGenericVarsProlog(CodeGenFunction &CGF, |
1372 | SourceLocation Loc, |
1373 | bool WithSPMDCheck) { |
1374 | if (getDataSharingMode(CGM) != CGOpenMPRuntimeGPU::Generic && |
1375 | getExecutionMode() != CGOpenMPRuntimeGPU::EM_SPMD) |
1376 | return; |
1377 | |
1378 | CGBuilderTy &Bld = CGF.Builder; |
1379 | |
1380 | const auto I = FunctionGlobalizedDecls.find(CGF.CurFn); |
1381 | if (I == FunctionGlobalizedDecls.end()) |
1382 | return; |
1383 | |
1384 | for (auto &Rec : I->getSecond().LocalVarData) { |
1385 | const auto *VD = cast<VarDecl>(Rec.first); |
1386 | bool EscapedParam = I->getSecond().EscapedParameters.count(Rec.first); |
1387 | QualType VarTy = VD->getType(); |
1388 | |
1389 | // Get the local allocation of a firstprivate variable before sharing |
1390 | llvm::Value *ParValue; |
1391 | if (EscapedParam) { |
1392 | LValue ParLVal = |
1393 | CGF.MakeAddrLValue(CGF.GetAddrOfLocalVar(VD), VD->getType()); |
1394 | ParValue = CGF.EmitLoadOfScalar(ParLVal, Loc); |
1395 | } |
1396 | |
1397 | // Allocate space for the variable to be globalized |
1398 | llvm::Value *AllocArgs[] = {CGF.getTypeSize(VD->getType())}; |
1399 | llvm::Instruction *VoidPtr = |
1400 | CGF.EmitRuntimeCall(OMPBuilder.getOrCreateRuntimeFunction( |
1401 | CGM.getModule(), OMPRTL___kmpc_alloc_shared), |
1402 | AllocArgs, VD->getName()); |
1403 | |
1404 | // Cast the void pointer and get the address of the globalized variable. |
1405 | llvm::PointerType *VarPtrTy = CGF.ConvertTypeForMem(VarTy)->getPointerTo(); |
1406 | llvm::Value *CastedVoidPtr = Bld.CreatePointerBitCastOrAddrSpaceCast( |
1407 | VoidPtr, VarPtrTy, VD->getName() + "_on_stack"); |
1408 | LValue VarAddr = CGF.MakeNaturalAlignAddrLValue(CastedVoidPtr, VarTy); |
1409 | Rec.second.PrivateAddr = VarAddr.getAddress(CGF); |
1410 | Rec.second.GlobalizedVal = VoidPtr; |
1411 | |
1412 | // Assign the local allocation to the newly globalized location. |
1413 | if (EscapedParam) { |
1414 | CGF.EmitStoreOfScalar(ParValue, VarAddr); |
1415 | I->getSecond().MappedParams->setVarAddr(CGF, VD, VarAddr.getAddress(CGF)); |
1416 | } |
1417 | if (auto *DI = CGF.getDebugInfo()) |
1418 | VoidPtr->setDebugLoc(DI->SourceLocToDebugLoc(VD->getLocation())); |
1419 | } |
1420 | for (const auto *VD : I->getSecond().EscapedVariableLengthDecls) { |
1421 | // Use actual memory size of the VLA object including the padding |
1422 | // for alignment purposes. |
1423 | llvm::Value *Size = CGF.getTypeSize(VD->getType()); |
1424 | CharUnits Align = CGM.getContext().getDeclAlign(VD); |
1425 | Size = Bld.CreateNUWAdd( |
1426 | Size, llvm::ConstantInt::get(CGF.SizeTy, Align.getQuantity() - 1)); |
1427 | llvm::Value *AlignVal = |
1428 | llvm::ConstantInt::get(CGF.SizeTy, Align.getQuantity()); |
1429 | |
1430 | Size = Bld.CreateUDiv(Size, AlignVal); |
1431 | Size = Bld.CreateNUWMul(Size, AlignVal); |
Value stored to 'Size' is never read | |
1432 | |
1433 | // Allocate space for this VLA object to be globalized. |
1434 | llvm::Value *AllocArgs[] = {CGF.getTypeSize(VD->getType())}; |
1435 | llvm::Instruction *VoidPtr = |
1436 | CGF.EmitRuntimeCall(OMPBuilder.getOrCreateRuntimeFunction( |
1437 | CGM.getModule(), OMPRTL___kmpc_alloc_shared), |
1438 | AllocArgs, VD->getName()); |
1439 | |
1440 | I->getSecond().EscapedVariableLengthDeclsAddrs.emplace_back( |
1441 | std::pair<llvm::Value *, llvm::Value *>( |
1442 | {VoidPtr, CGF.getTypeSize(VD->getType())})); |
1443 | LValue Base = CGF.MakeAddrLValue(VoidPtr, VD->getType(), |
1444 | CGM.getContext().getDeclAlign(VD), |
1445 | AlignmentSource::Decl); |
1446 | I->getSecond().MappedParams->setVarAddr(CGF, cast<VarDecl>(VD), |
1447 | Base.getAddress(CGF)); |
1448 | } |
1449 | I->getSecond().MappedParams->apply(CGF); |
1450 | } |
1451 | |
1452 | void CGOpenMPRuntimeGPU::emitGenericVarsEpilog(CodeGenFunction &CGF, |
1453 | bool WithSPMDCheck) { |
1454 | if (getDataSharingMode(CGM) != CGOpenMPRuntimeGPU::Generic && |
1455 | getExecutionMode() != CGOpenMPRuntimeGPU::EM_SPMD) |
1456 | return; |
1457 | |
1458 | const auto I = FunctionGlobalizedDecls.find(CGF.CurFn); |
1459 | if (I != FunctionGlobalizedDecls.end()) { |
1460 | // Deallocate the memory for each globalized VLA object |
1461 | for (auto AddrSizePair : |
1462 | llvm::reverse(I->getSecond().EscapedVariableLengthDeclsAddrs)) { |
1463 | CGF.EmitRuntimeCall(OMPBuilder.getOrCreateRuntimeFunction( |
1464 | CGM.getModule(), OMPRTL___kmpc_free_shared), |
1465 | {AddrSizePair.first, AddrSizePair.second}); |
1466 | } |
1467 | // Deallocate the memory for each globalized value |
1468 | for (auto &Rec : llvm::reverse(I->getSecond().LocalVarData)) { |
1469 | const auto *VD = cast<VarDecl>(Rec.first); |
1470 | I->getSecond().MappedParams->restore(CGF); |
1471 | |
1472 | llvm::Value *FreeArgs[] = {Rec.second.GlobalizedVal, |
1473 | CGF.getTypeSize(VD->getType())}; |
1474 | CGF.EmitRuntimeCall(OMPBuilder.getOrCreateRuntimeFunction( |
1475 | CGM.getModule(), OMPRTL___kmpc_free_shared), |
1476 | FreeArgs); |
1477 | } |
1478 | } |
1479 | } |
1480 | |
1481 | void CGOpenMPRuntimeGPU::emitTeamsCall(CodeGenFunction &CGF, |
1482 | const OMPExecutableDirective &D, |
1483 | SourceLocation Loc, |
1484 | llvm::Function *OutlinedFn, |
1485 | ArrayRef<llvm::Value *> CapturedVars) { |
1486 | if (!CGF.HaveInsertPoint()) |
1487 | return; |
1488 | |
1489 | Address ZeroAddr = CGF.CreateDefaultAlignTempAlloca(CGF.Int32Ty, |
1490 | /*Name=*/".zero.addr"); |
1491 | CGF.InitTempAlloca(ZeroAddr, CGF.Builder.getInt32(/*C*/ 0)); |
1492 | llvm::SmallVector<llvm::Value *, 16> OutlinedFnArgs; |
1493 | OutlinedFnArgs.push_back(emitThreadIDAddress(CGF, Loc).getPointer()); |
1494 | OutlinedFnArgs.push_back(ZeroAddr.getPointer()); |
1495 | OutlinedFnArgs.append(CapturedVars.begin(), CapturedVars.end()); |
1496 | emitOutlinedFunctionCall(CGF, Loc, OutlinedFn, OutlinedFnArgs); |
1497 | } |
1498 | |
1499 | void CGOpenMPRuntimeGPU::emitParallelCall(CodeGenFunction &CGF, |
1500 | SourceLocation Loc, |
1501 | llvm::Function *OutlinedFn, |
1502 | ArrayRef<llvm::Value *> CapturedVars, |
1503 | const Expr *IfCond) { |
1504 | if (!CGF.HaveInsertPoint()) |
1505 | return; |
1506 | |
1507 | auto &&ParallelGen = [this, Loc, OutlinedFn, CapturedVars, |
1508 | IfCond](CodeGenFunction &CGF, PrePostActionTy &Action) { |
1509 | CGBuilderTy &Bld = CGF.Builder; |
1510 | llvm::Function *WFn = WrapperFunctionsMap[OutlinedFn]; |
1511 | llvm::Value *ID = llvm::ConstantPointerNull::get(CGM.Int8PtrTy); |
1512 | if (WFn) |
1513 | ID = Bld.CreateBitOrPointerCast(WFn, CGM.Int8PtrTy); |
1514 | llvm::Value *FnPtr = Bld.CreateBitOrPointerCast(OutlinedFn, CGM.Int8PtrTy); |
1515 | |
1516 | // Create a private scope that will globalize the arguments |
1517 | // passed from the outside of the target region. |
1518 | // TODO: Is that needed? |
1519 | CodeGenFunction::OMPPrivateScope PrivateArgScope(CGF); |
1520 | |
1521 | Address CapturedVarsAddrs = CGF.CreateDefaultAlignTempAlloca( |
1522 | llvm::ArrayType::get(CGM.VoidPtrTy, CapturedVars.size()), |
1523 | "captured_vars_addrs"); |
1524 | // There's something to share. |
1525 | if (!CapturedVars.empty()) { |
1526 | // Prepare for parallel region. Indicate the outlined function. |
1527 | ASTContext &Ctx = CGF.getContext(); |
1528 | unsigned Idx = 0; |
1529 | for (llvm::Value *V : CapturedVars) { |
1530 | Address Dst = Bld.CreateConstArrayGEP(CapturedVarsAddrs, Idx); |
1531 | llvm::Value *PtrV; |
1532 | if (V->getType()->isIntegerTy()) |
1533 | PtrV = Bld.CreateIntToPtr(V, CGF.VoidPtrTy); |
1534 | else |
1535 | PtrV = Bld.CreatePointerBitCastOrAddrSpaceCast(V, CGF.VoidPtrTy); |
1536 | CGF.EmitStoreOfScalar(PtrV, Dst, /*Volatile=*/false, |
1537 | Ctx.getPointerType(Ctx.VoidPtrTy)); |
1538 | ++Idx; |
1539 | } |
1540 | } |
1541 | |
1542 | llvm::Value *IfCondVal = nullptr; |
1543 | if (IfCond) |
1544 | IfCondVal = Bld.CreateIntCast(CGF.EvaluateExprAsBool(IfCond), CGF.Int32Ty, |
1545 | /* isSigned */ false); |
1546 | else |
1547 | IfCondVal = llvm::ConstantInt::get(CGF.Int32Ty, 1); |
1548 | |
1549 | assert(IfCondVal && "Expected a value")((void)0); |
1550 | llvm::Value *RTLoc = emitUpdateLocation(CGF, Loc); |
1551 | llvm::Value *Args[] = { |
1552 | RTLoc, |
1553 | getThreadID(CGF, Loc), |
1554 | IfCondVal, |
1555 | llvm::ConstantInt::get(CGF.Int32Ty, -1), |
1556 | llvm::ConstantInt::get(CGF.Int32Ty, -1), |
1557 | FnPtr, |
1558 | ID, |
1559 | Bld.CreateBitOrPointerCast(CapturedVarsAddrs.getPointer(), |
1560 | CGF.VoidPtrPtrTy), |
1561 | llvm::ConstantInt::get(CGM.SizeTy, CapturedVars.size())}; |
1562 | CGF.EmitRuntimeCall(OMPBuilder.getOrCreateRuntimeFunction( |
1563 | CGM.getModule(), OMPRTL___kmpc_parallel_51), |
1564 | Args); |
1565 | }; |
1566 | |
1567 | RegionCodeGenTy RCG(ParallelGen); |
1568 | RCG(CGF); |
1569 | } |
1570 | |
1571 | void CGOpenMPRuntimeGPU::syncCTAThreads(CodeGenFunction &CGF) { |
1572 | // Always emit simple barriers! |
1573 | if (!CGF.HaveInsertPoint()) |
1574 | return; |
1575 | // Build call __kmpc_barrier_simple_spmd(nullptr, 0); |
1576 | // This function does not use parameters, so we can emit just default values. |
1577 | llvm::Value *Args[] = { |
1578 | llvm::ConstantPointerNull::get( |
1579 | cast<llvm::PointerType>(getIdentTyPointerTy())), |
1580 | llvm::ConstantInt::get(CGF.Int32Ty, /*V=*/0, /*isSigned=*/true)}; |
1581 | CGF.EmitRuntimeCall(OMPBuilder.getOrCreateRuntimeFunction( |
1582 | CGM.getModule(), OMPRTL___kmpc_barrier_simple_spmd), |
1583 | Args); |
1584 | } |
1585 | |
1586 | void CGOpenMPRuntimeGPU::emitBarrierCall(CodeGenFunction &CGF, |
1587 | SourceLocation Loc, |
1588 | OpenMPDirectiveKind Kind, bool, |
1589 | bool) { |
1590 | // Always emit simple barriers! |
1591 | if (!CGF.HaveInsertPoint()) |
1592 | return; |
1593 | // Build call __kmpc_cancel_barrier(loc, thread_id); |
1594 | unsigned Flags = getDefaultFlagsForBarriers(Kind); |
1595 | llvm::Value *Args[] = {emitUpdateLocation(CGF, Loc, Flags), |
1596 | getThreadID(CGF, Loc)}; |
1597 | |
1598 | CGF.EmitRuntimeCall(OMPBuilder.getOrCreateRuntimeFunction( |
1599 | CGM.getModule(), OMPRTL___kmpc_barrier), |
1600 | Args); |
1601 | } |
1602 | |
1603 | void CGOpenMPRuntimeGPU::emitCriticalRegion( |
1604 | CodeGenFunction &CGF, StringRef CriticalName, |
1605 | const RegionCodeGenTy &CriticalOpGen, SourceLocation Loc, |
1606 | const Expr *Hint) { |
1607 | llvm::BasicBlock *LoopBB = CGF.createBasicBlock("omp.critical.loop"); |
1608 | llvm::BasicBlock *TestBB = CGF.createBasicBlock("omp.critical.test"); |
1609 | llvm::BasicBlock *SyncBB = CGF.createBasicBlock("omp.critical.sync"); |
1610 | llvm::BasicBlock *BodyBB = CGF.createBasicBlock("omp.critical.body"); |
1611 | llvm::BasicBlock *ExitBB = CGF.createBasicBlock("omp.critical.exit"); |
1612 | |
1613 | auto &RT = static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime()); |
1614 | |
1615 | // Get the mask of active threads in the warp. |
1616 | llvm::Value *Mask = CGF.EmitRuntimeCall(OMPBuilder.getOrCreateRuntimeFunction( |
1617 | CGM.getModule(), OMPRTL___kmpc_warp_active_thread_mask)); |
1618 | // Fetch team-local id of the thread. |
1619 | llvm::Value *ThreadID = RT.getGPUThreadID(CGF); |
1620 | |
1621 | // Get the width of the team. |
1622 | llvm::Value *TeamWidth = RT.getGPUNumThreads(CGF); |
1623 | |
1624 | // Initialize the counter variable for the loop. |
1625 | QualType Int32Ty = |
1626 | CGF.getContext().getIntTypeForBitwidth(/*DestWidth=*/32, /*Signed=*/0); |
1627 | Address Counter = CGF.CreateMemTemp(Int32Ty, "critical_counter"); |
1628 | LValue CounterLVal = CGF.MakeAddrLValue(Counter, Int32Ty); |
1629 | CGF.EmitStoreOfScalar(llvm::Constant::getNullValue(CGM.Int32Ty), CounterLVal, |
1630 | /*isInit=*/true); |
1631 | |
1632 | // Block checks if loop counter exceeds upper bound. |
1633 | CGF.EmitBlock(LoopBB); |
1634 | llvm::Value *CounterVal = CGF.EmitLoadOfScalar(CounterLVal, Loc); |
1635 | llvm::Value *CmpLoopBound = CGF.Builder.CreateICmpSLT(CounterVal, TeamWidth); |
1636 | CGF.Builder.CreateCondBr(CmpLoopBound, TestBB, ExitBB); |
1637 | |
1638 | // Block tests which single thread should execute region, and which threads |
1639 | // should go straight to synchronisation point. |
1640 | CGF.EmitBlock(TestBB); |
1641 | CounterVal = CGF.EmitLoadOfScalar(CounterLVal, Loc); |
1642 | llvm::Value *CmpThreadToCounter = |
1643 | CGF.Builder.CreateICmpEQ(ThreadID, CounterVal); |
1644 | CGF.Builder.CreateCondBr(CmpThreadToCounter, BodyBB, SyncBB); |
1645 | |
1646 | // Block emits the body of the critical region. |
1647 | CGF.EmitBlock(BodyBB); |
1648 | |
1649 | // Output the critical statement. |
1650 | CGOpenMPRuntime::emitCriticalRegion(CGF, CriticalName, CriticalOpGen, Loc, |
1651 | Hint); |
1652 | |
1653 | // After the body surrounded by the critical region, the single executing |
1654 | // thread will jump to the synchronisation point. |
1655 | // Block waits for all threads in current team to finish then increments the |
1656 | // counter variable and returns to the loop. |
1657 | CGF.EmitBlock(SyncBB); |
1658 | // Reconverge active threads in the warp. |
1659 | (void)CGF.EmitRuntimeCall(OMPBuilder.getOrCreateRuntimeFunction( |
1660 | CGM.getModule(), OMPRTL___kmpc_syncwarp), |
1661 | Mask); |
1662 | |
1663 | llvm::Value *IncCounterVal = |
1664 | CGF.Builder.CreateNSWAdd(CounterVal, CGF.Builder.getInt32(1)); |
1665 | CGF.EmitStoreOfScalar(IncCounterVal, CounterLVal); |
1666 | CGF.EmitBranch(LoopBB); |
1667 | |
1668 | // Block that is reached when all threads in the team complete the region. |
1669 | CGF.EmitBlock(ExitBB, /*IsFinished=*/true); |
1670 | } |
1671 | |
1672 | /// Cast value to the specified type. |
1673 | static llvm::Value *castValueToType(CodeGenFunction &CGF, llvm::Value *Val, |
1674 | QualType ValTy, QualType CastTy, |
1675 | SourceLocation Loc) { |
1676 | assert(!CGF.getContext().getTypeSizeInChars(CastTy).isZero() &&((void)0) |
1677 | "Cast type must sized.")((void)0); |
1678 | assert(!CGF.getContext().getTypeSizeInChars(ValTy).isZero() &&((void)0) |
1679 | "Val type must sized.")((void)0); |
1680 | llvm::Type *LLVMCastTy = CGF.ConvertTypeForMem(CastTy); |
1681 | if (ValTy == CastTy) |
1682 | return Val; |
1683 | if (CGF.getContext().getTypeSizeInChars(ValTy) == |
1684 | CGF.getContext().getTypeSizeInChars(CastTy)) |
1685 | return CGF.Builder.CreateBitCast(Val, LLVMCastTy); |
1686 | if (CastTy->isIntegerType() && ValTy->isIntegerType()) |
1687 | return CGF.Builder.CreateIntCast(Val, LLVMCastTy, |
1688 | CastTy->hasSignedIntegerRepresentation()); |
1689 | Address CastItem = CGF.CreateMemTemp(CastTy); |
1690 | Address ValCastItem = CGF.Builder.CreatePointerBitCastOrAddrSpaceCast( |
1691 | CastItem, Val->getType()->getPointerTo(CastItem.getAddressSpace())); |
1692 | CGF.EmitStoreOfScalar(Val, ValCastItem, /*Volatile=*/false, ValTy, |
1693 | LValueBaseInfo(AlignmentSource::Type), |
1694 | TBAAAccessInfo()); |
1695 | return CGF.EmitLoadOfScalar(CastItem, /*Volatile=*/false, CastTy, Loc, |
1696 | LValueBaseInfo(AlignmentSource::Type), |
1697 | TBAAAccessInfo()); |
1698 | } |
1699 | |
1700 | /// This function creates calls to one of two shuffle functions to copy |
1701 | /// variables between lanes in a warp. |
1702 | static llvm::Value *createRuntimeShuffleFunction(CodeGenFunction &CGF, |
1703 | llvm::Value *Elem, |
1704 | QualType ElemType, |
1705 | llvm::Value *Offset, |
1706 | SourceLocation Loc) { |
1707 | CodeGenModule &CGM = CGF.CGM; |
1708 | CGBuilderTy &Bld = CGF.Builder; |
1709 | CGOpenMPRuntimeGPU &RT = |
1710 | *(static_cast<CGOpenMPRuntimeGPU *>(&CGM.getOpenMPRuntime())); |
1711 | llvm::OpenMPIRBuilder &OMPBuilder = RT.getOMPBuilder(); |
1712 | |
1713 | CharUnits Size = CGF.getContext().getTypeSizeInChars(ElemType); |
1714 | assert(Size.getQuantity() <= 8 &&((void)0) |
1715 | "Unsupported bitwidth in shuffle instruction.")((void)0); |
1716 | |
1717 | RuntimeFunction ShuffleFn = Size.getQuantity() <= 4 |
1718 | ? OMPRTL___kmpc_shuffle_int32 |
1719 | : OMPRTL___kmpc_shuffle_int64; |
1720 | |
1721 | // Cast all types to 32- or 64-bit values before calling shuffle routines. |
1722 | QualType CastTy = CGF.getContext().getIntTypeForBitwidth( |
1723 | Size.getQuantity() <= 4 ? 32 : 64, /*Signed=*/1); |
1724 | llvm::Value *ElemCast = castValueToType(CGF, Elem, ElemType, CastTy, Loc); |
1725 | llvm::Value *WarpSize = |
1726 | Bld.CreateIntCast(RT.getGPUWarpSize(CGF), CGM.Int16Ty, /*isSigned=*/true); |
1727 | |
1728 | llvm::Value *ShuffledVal = CGF.EmitRuntimeCall( |
1729 | OMPBuilder.getOrCreateRuntimeFunction(CGM.getModule(), ShuffleFn), |
1730 | {ElemCast, Offset, WarpSize}); |
1731 | |
1732 | return castValueToType(CGF, ShuffledVal, CastTy, ElemType, Loc); |
1733 | } |
1734 | |
1735 | static void shuffleAndStore(CodeGenFunction &CGF, Address SrcAddr, |
1736 | Address DestAddr, QualType ElemType, |
1737 | llvm::Value *Offset, SourceLocation Loc) { |
1738 | CGBuilderTy &Bld = CGF.Builder; |
1739 | |
1740 | CharUnits Size = CGF.getContext().getTypeSizeInChars(ElemType); |
1741 | // Create the loop over the big sized data. |
1742 | // ptr = (void*)Elem; |
1743 | // ptrEnd = (void*) Elem + 1; |
1744 | // Step = 8; |
1745 | // while (ptr + Step < ptrEnd) |
1746 | // shuffle((int64_t)*ptr); |
1747 | // Step = 4; |
1748 | // while (ptr + Step < ptrEnd) |
1749 | // shuffle((int32_t)*ptr); |
1750 | // ... |
1751 | Address ElemPtr = DestAddr; |
1752 | Address Ptr = SrcAddr; |
1753 | Address PtrEnd = Bld.CreatePointerBitCastOrAddrSpaceCast( |
1754 | Bld.CreateConstGEP(SrcAddr, 1), CGF.VoidPtrTy); |
1755 | for (int IntSize = 8; IntSize >= 1; IntSize /= 2) { |
1756 | if (Size < CharUnits::fromQuantity(IntSize)) |
1757 | continue; |
1758 | QualType IntType = CGF.getContext().getIntTypeForBitwidth( |
1759 | CGF.getContext().toBits(CharUnits::fromQuantity(IntSize)), |
1760 | /*Signed=*/1); |
1761 | llvm::Type *IntTy = CGF.ConvertTypeForMem(IntType); |
1762 | Ptr = Bld.CreatePointerBitCastOrAddrSpaceCast(Ptr, IntTy->getPointerTo()); |
1763 | ElemPtr = |
1764 | Bld.CreatePointerBitCastOrAddrSpaceCast(ElemPtr, IntTy->getPointerTo()); |
1765 | if (Size.getQuantity() / IntSize > 1) { |
1766 | llvm::BasicBlock *PreCondBB = CGF.createBasicBlock(".shuffle.pre_cond"); |
1767 | llvm::BasicBlock *ThenBB = CGF.createBasicBlock(".shuffle.then"); |
1768 | llvm::BasicBlock *ExitBB = CGF.createBasicBlock(".shuffle.exit"); |
1769 | llvm::BasicBlock *CurrentBB = Bld.GetInsertBlock(); |
1770 | CGF.EmitBlock(PreCondBB); |
1771 | llvm::PHINode *PhiSrc = |
1772 | Bld.CreatePHI(Ptr.getType(), /*NumReservedValues=*/2); |
1773 | PhiSrc->addIncoming(Ptr.getPointer(), CurrentBB); |
1774 | llvm::PHINode *PhiDest = |
1775 | Bld.CreatePHI(ElemPtr.getType(), /*NumReservedValues=*/2); |
1776 | PhiDest->addIncoming(ElemPtr.getPointer(), CurrentBB); |
1777 | Ptr = Address(PhiSrc, Ptr.getAlignment()); |
1778 | ElemPtr = Address(PhiDest, ElemPtr.getAlignment()); |
1779 | llvm::Value *PtrDiff = Bld.CreatePtrDiff( |
1780 | PtrEnd.getPointer(), Bld.CreatePointerBitCastOrAddrSpaceCast( |
1781 | Ptr.getPointer(), CGF.VoidPtrTy)); |
1782 | Bld.CreateCondBr(Bld.CreateICmpSGT(PtrDiff, Bld.getInt64(IntSize - 1)), |
1783 | ThenBB, ExitBB); |
1784 | CGF.EmitBlock(ThenBB); |
1785 | llvm::Value *Res = createRuntimeShuffleFunction( |
1786 | CGF, |
1787 | CGF.EmitLoadOfScalar(Ptr, /*Volatile=*/false, IntType, Loc, |
1788 | LValueBaseInfo(AlignmentSource::Type), |
1789 | TBAAAccessInfo()), |
1790 | IntType, Offset, Loc); |
1791 | CGF.EmitStoreOfScalar(Res, ElemPtr, /*Volatile=*/false, IntType, |
1792 | LValueBaseInfo(AlignmentSource::Type), |
1793 | TBAAAccessInfo()); |
1794 | Address LocalPtr = Bld.CreateConstGEP(Ptr, 1); |
1795 | Address LocalElemPtr = Bld.CreateConstGEP(ElemPtr, 1); |
1796 | PhiSrc->addIncoming(LocalPtr.getPointer(), ThenBB); |
1797 | PhiDest->addIncoming(LocalElemPtr.getPointer(), ThenBB); |
1798 | CGF.EmitBranch(PreCondBB); |
1799 | CGF.EmitBlock(ExitBB); |
1800 | } else { |
1801 | llvm::Value *Res = createRuntimeShuffleFunction( |
1802 | CGF, |
1803 | CGF.EmitLoadOfScalar(Ptr, /*Volatile=*/false, IntType, Loc, |
1804 | LValueBaseInfo(AlignmentSource::Type), |
1805 | TBAAAccessInfo()), |
1806 | IntType, Offset, Loc); |
1807 | CGF.EmitStoreOfScalar(Res, ElemPtr, /*Volatile=*/false, IntType, |
1808 | LValueBaseInfo(AlignmentSource::Type), |
1809 | TBAAAccessInfo()); |
1810 | Ptr = Bld.CreateConstGEP(Ptr, 1); |
1811 | ElemPtr = Bld.CreateConstGEP(ElemPtr, 1); |
1812 | } |
1813 | Size = Size % IntSize; |
1814 | } |
1815 | } |
1816 | |
1817 | namespace { |
1818 | enum CopyAction : unsigned { |
1819 | // RemoteLaneToThread: Copy over a Reduce list from a remote lane in |
1820 | // the warp using shuffle instructions. |
1821 | RemoteLaneToThread, |
1822 | // ThreadCopy: Make a copy of a Reduce list on the thread's stack. |
1823 | ThreadCopy, |
1824 | // ThreadToScratchpad: Copy a team-reduced array to the scratchpad. |
1825 | ThreadToScratchpad, |
1826 | // ScratchpadToThread: Copy from a scratchpad array in global memory |
1827 | // containing team-reduced data to a thread's stack. |
1828 | ScratchpadToThread, |
1829 | }; |
1830 | } // namespace |
1831 | |
1832 | struct CopyOptionsTy { |
1833 | llvm::Value *RemoteLaneOffset; |
1834 | llvm::Value *ScratchpadIndex; |
1835 | llvm::Value *ScratchpadWidth; |
1836 | }; |
1837 | |
1838 | /// Emit instructions to copy a Reduce list, which contains partially |
1839 | /// aggregated values, in the specified direction. |
1840 | static void emitReductionListCopy( |
1841 | CopyAction Action, CodeGenFunction &CGF, QualType ReductionArrayTy, |
1842 | ArrayRef<const Expr *> Privates, Address SrcBase, Address DestBase, |
1843 | CopyOptionsTy CopyOptions = {nullptr, nullptr, nullptr}) { |
1844 | |
1845 | CodeGenModule &CGM = CGF.CGM; |
1846 | ASTContext &C = CGM.getContext(); |
1847 | CGBuilderTy &Bld = CGF.Builder; |
1848 | |
1849 | llvm::Value *RemoteLaneOffset = CopyOptions.RemoteLaneOffset; |
1850 | llvm::Value *ScratchpadIndex = CopyOptions.ScratchpadIndex; |
1851 | llvm::Value *ScratchpadWidth = CopyOptions.ScratchpadWidth; |
1852 | |
1853 | // Iterates, element-by-element, through the source Reduce list and |
1854 | // make a copy. |
1855 | unsigned Idx = 0; |
1856 | unsigned Size = Privates.size(); |
1857 | for (const Expr *Private : Privates) { |
1858 | Address SrcElementAddr = Address::invalid(); |
1859 | Address DestElementAddr = Address::invalid(); |
1860 | Address DestElementPtrAddr = Address::invalid(); |
1861 | // Should we shuffle in an element from a remote lane? |
1862 | bool ShuffleInElement = false; |
1863 | // Set to true to update the pointer in the dest Reduce list to a |
1864 | // newly created element. |
1865 | bool UpdateDestListPtr = false; |
1866 | // Increment the src or dest pointer to the scratchpad, for each |
1867 | // new element. |
1868 | bool IncrScratchpadSrc = false; |
1869 | bool IncrScratchpadDest = false; |
1870 | |
1871 | switch (Action) { |
1872 | case RemoteLaneToThread: { |
1873 | // Step 1.1: Get the address for the src element in the Reduce list. |
1874 | Address SrcElementPtrAddr = Bld.CreateConstArrayGEP(SrcBase, Idx); |
1875 | SrcElementAddr = CGF.EmitLoadOfPointer( |
1876 | SrcElementPtrAddr, |
1877 | C.getPointerType(Private->getType())->castAs<PointerType>()); |
1878 | |
1879 | // Step 1.2: Create a temporary to store the element in the destination |
1880 | // Reduce list. |
1881 | DestElementPtrAddr = Bld.CreateConstArrayGEP(DestBase, Idx); |
1882 | DestElementAddr = |
1883 | CGF.CreateMemTemp(Private->getType(), ".omp.reduction.element"); |
1884 | ShuffleInElement = true; |
1885 | UpdateDestListPtr = true; |
1886 | break; |
1887 | } |
1888 | case ThreadCopy: { |
1889 | // Step 1.1: Get the address for the src element in the Reduce list. |
1890 | Address SrcElementPtrAddr = Bld.CreateConstArrayGEP(SrcBase, Idx); |
1891 | SrcElementAddr = CGF.EmitLoadOfPointer( |
1892 | SrcElementPtrAddr, |
1893 | C.getPointerType(Private->getType())->castAs<PointerType>()); |
1894 | |
1895 | // Step 1.2: Get the address for dest element. The destination |
1896 | // element has already been created on the thread's stack. |
1897 | DestElementPtrAddr = Bld.CreateConstArrayGEP(DestBase, Idx); |
1898 | DestElementAddr = CGF.EmitLoadOfPointer( |
1899 | DestElementPtrAddr, |
1900 | C.getPointerType(Private->getType())->castAs<PointerType>()); |
1901 | break; |
1902 | } |
1903 | case ThreadToScratchpad: { |
1904 | // Step 1.1: Get the address for the src element in the Reduce list. |
1905 | Address SrcElementPtrAddr = Bld.CreateConstArrayGEP(SrcBase, Idx); |
1906 | SrcElementAddr = CGF.EmitLoadOfPointer( |
1907 | SrcElementPtrAddr, |
1908 | C.getPointerType(Private->getType())->castAs<PointerType>()); |
1909 | |
1910 | // Step 1.2: Get the address for dest element: |
1911 | // address = base + index * ElementSizeInChars. |
1912 | llvm::Value *ElementSizeInChars = CGF.getTypeSize(Private->getType()); |
1913 | llvm::Value *CurrentOffset = |
1914 | Bld.CreateNUWMul(ElementSizeInChars, ScratchpadIndex); |
1915 | llvm::Value *ScratchPadElemAbsolutePtrVal = |
1916 | Bld.CreateNUWAdd(DestBase.getPointer(), CurrentOffset); |
1917 | ScratchPadElemAbsolutePtrVal = |
1918 | Bld.CreateIntToPtr(ScratchPadElemAbsolutePtrVal, CGF.VoidPtrTy); |
1919 | DestElementAddr = Address(ScratchPadElemAbsolutePtrVal, |
1920 | C.getTypeAlignInChars(Private->getType())); |
1921 | IncrScratchpadDest = true; |
1922 | break; |
1923 | } |
1924 | case ScratchpadToThread: { |
1925 | // Step 1.1: Get the address for the src element in the scratchpad. |
1926 | // address = base + index * ElementSizeInChars. |
1927 | llvm::Value *ElementSizeInChars = CGF.getTypeSize(Private->getType()); |
1928 | llvm::Value *CurrentOffset = |
1929 | Bld.CreateNUWMul(ElementSizeInChars, ScratchpadIndex); |
1930 | llvm::Value *ScratchPadElemAbsolutePtrVal = |
1931 | Bld.CreateNUWAdd(SrcBase.getPointer(), CurrentOffset); |
1932 | ScratchPadElemAbsolutePtrVal = |
1933 | Bld.CreateIntToPtr(ScratchPadElemAbsolutePtrVal, CGF.VoidPtrTy); |
1934 | SrcElementAddr = Address(ScratchPadElemAbsolutePtrVal, |
1935 | C.getTypeAlignInChars(Private->getType())); |
1936 | IncrScratchpadSrc = true; |
1937 | |
1938 | // Step 1.2: Create a temporary to store the element in the destination |
1939 | // Reduce list. |
1940 | DestElementPtrAddr = Bld.CreateConstArrayGEP(DestBase, Idx); |
1941 | DestElementAddr = |
1942 | CGF.CreateMemTemp(Private->getType(), ".omp.reduction.element"); |
1943 | UpdateDestListPtr = true; |
1944 | break; |
1945 | } |
1946 | } |
1947 | |
1948 | // Regardless of src and dest of copy, we emit the load of src |
1949 | // element as this is required in all directions |
1950 | SrcElementAddr = Bld.CreateElementBitCast( |
1951 | SrcElementAddr, CGF.ConvertTypeForMem(Private->getType())); |
1952 | DestElementAddr = Bld.CreateElementBitCast(DestElementAddr, |
1953 | SrcElementAddr.getElementType()); |
1954 | |
1955 | // Now that all active lanes have read the element in the |
1956 | // Reduce list, shuffle over the value from the remote lane. |
1957 | if (ShuffleInElement) { |
1958 | shuffleAndStore(CGF, SrcElementAddr, DestElementAddr, Private->getType(), |
1959 | RemoteLaneOffset, Private->getExprLoc()); |
1960 | } else { |
1961 | switch (CGF.getEvaluationKind(Private->getType())) { |
1962 | case TEK_Scalar: { |
1963 | llvm::Value *Elem = CGF.EmitLoadOfScalar( |
1964 | SrcElementAddr, /*Volatile=*/false, Private->getType(), |
1965 | Private->getExprLoc(), LValueBaseInfo(AlignmentSource::Type), |
1966 | TBAAAccessInfo()); |
1967 | // Store the source element value to the dest element address. |
1968 | CGF.EmitStoreOfScalar( |
1969 | Elem, DestElementAddr, /*Volatile=*/false, Private->getType(), |
1970 | LValueBaseInfo(AlignmentSource::Type), TBAAAccessInfo()); |
1971 | break; |
1972 | } |
1973 | case TEK_Complex: { |
1974 | CodeGenFunction::ComplexPairTy Elem = CGF.EmitLoadOfComplex( |
1975 | CGF.MakeAddrLValue(SrcElementAddr, Private->getType()), |
1976 | Private->getExprLoc()); |
1977 | CGF.EmitStoreOfComplex( |
1978 | Elem, CGF.MakeAddrLValue(DestElementAddr, Private->getType()), |
1979 | /*isInit=*/false); |
1980 | break; |
1981 | } |
1982 | case TEK_Aggregate: |
1983 | CGF.EmitAggregateCopy( |
1984 | CGF.MakeAddrLValue(DestElementAddr, Private->getType()), |
1985 | CGF.MakeAddrLValue(SrcElementAddr, Private->getType()), |
1986 | Private->getType(), AggValueSlot::DoesNotOverlap); |
1987 | break; |
1988 | } |
1989 | } |
1990 | |
1991 | // Step 3.1: Modify reference in dest Reduce list as needed. |
1992 | // Modifying the reference in Reduce list to point to the newly |
1993 | // created element. The element is live in the current function |
1994 | // scope and that of functions it invokes (i.e., reduce_function). |
1995 | // RemoteReduceData[i] = (void*)&RemoteElem |
1996 | if (UpdateDestListPtr) { |
1997 | CGF.EmitStoreOfScalar(Bld.CreatePointerBitCastOrAddrSpaceCast( |
1998 | DestElementAddr.getPointer(), CGF.VoidPtrTy), |
1999 | DestElementPtrAddr, /*Volatile=*/false, |
2000 | C.VoidPtrTy); |
2001 | } |
2002 | |
2003 | // Step 4.1: Increment SrcBase/DestBase so that it points to the starting |
2004 | // address of the next element in scratchpad memory, unless we're currently |
2005 | // processing the last one. Memory alignment is also taken care of here. |
2006 | if ((IncrScratchpadDest || IncrScratchpadSrc) && (Idx + 1 < Size)) { |
2007 | llvm::Value *ScratchpadBasePtr = |
2008 | IncrScratchpadDest ? DestBase.getPointer() : SrcBase.getPointer(); |
2009 | llvm::Value *ElementSizeInChars = CGF.getTypeSize(Private->getType()); |
2010 | ScratchpadBasePtr = Bld.CreateNUWAdd( |
2011 | ScratchpadBasePtr, |
2012 | Bld.CreateNUWMul(ScratchpadWidth, ElementSizeInChars)); |
2013 | |
2014 | // Take care of global memory alignment for performance |
2015 | ScratchpadBasePtr = Bld.CreateNUWSub( |
2016 | ScratchpadBasePtr, llvm::ConstantInt::get(CGM.SizeTy, 1)); |
2017 | ScratchpadBasePtr = Bld.CreateUDiv( |
2018 | ScratchpadBasePtr, |
2019 | llvm::ConstantInt::get(CGM.SizeTy, GlobalMemoryAlignment)); |
2020 | ScratchpadBasePtr = Bld.CreateNUWAdd( |
2021 | ScratchpadBasePtr, llvm::ConstantInt::get(CGM.SizeTy, 1)); |
2022 | ScratchpadBasePtr = Bld.CreateNUWMul( |
2023 | ScratchpadBasePtr, |
2024 | llvm::ConstantInt::get(CGM.SizeTy, GlobalMemoryAlignment)); |
2025 | |
2026 | if (IncrScratchpadDest) |
2027 | DestBase = Address(ScratchpadBasePtr, CGF.getPointerAlign()); |
2028 | else /* IncrScratchpadSrc = true */ |
2029 | SrcBase = Address(ScratchpadBasePtr, CGF.getPointerAlign()); |
2030 | } |
2031 | |
2032 | ++Idx; |
2033 | } |
2034 | } |
2035 | |
2036 | /// This function emits a helper that gathers Reduce lists from the first |
2037 | /// lane of every active warp to lanes in the first warp. |
2038 | /// |
2039 | /// void inter_warp_copy_func(void* reduce_data, num_warps) |
2040 | /// shared smem[warp_size]; |
2041 | /// For all data entries D in reduce_data: |
2042 | /// sync |
2043 | /// If (I am the first lane in each warp) |
2044 | /// Copy my local D to smem[warp_id] |
2045 | /// sync |
2046 | /// if (I am the first warp) |
2047 | /// Copy smem[thread_id] to my local D |
2048 | static llvm::Value *emitInterWarpCopyFunction(CodeGenModule &CGM, |
2049 | ArrayRef<const Expr *> Privates, |
2050 | QualType ReductionArrayTy, |
2051 | SourceLocation Loc) { |
2052 | ASTContext &C = CGM.getContext(); |
2053 | llvm::Module &M = CGM.getModule(); |
2054 | |
2055 | // ReduceList: thread local Reduce list. |
2056 | // At the stage of the computation when this function is called, partially |
2057 | // aggregated values reside in the first lane of every active warp. |
2058 | ImplicitParamDecl ReduceListArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, |
2059 | C.VoidPtrTy, ImplicitParamDecl::Other); |
2060 | // NumWarps: number of warps active in the parallel region. This could |
2061 | // be smaller than 32 (max warps in a CTA) for partial block reduction. |
2062 | ImplicitParamDecl NumWarpsArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, |
2063 | C.getIntTypeForBitwidth(32, /* Signed */ true), |
2064 | ImplicitParamDecl::Other); |
2065 | FunctionArgList Args; |
2066 | Args.push_back(&ReduceListArg); |
2067 | Args.push_back(&NumWarpsArg); |
2068 | |
2069 | const CGFunctionInfo &CGFI = |
2070 | CGM.getTypes().arrangeBuiltinFunctionDeclaration(C.VoidTy, Args); |
2071 | auto *Fn = llvm::Function::Create(CGM.getTypes().GetFunctionType(CGFI), |
2072 | llvm::GlobalValue::InternalLinkage, |
2073 | "_omp_reduction_inter_warp_copy_func", &M); |
2074 | CGM.SetInternalFunctionAttributes(GlobalDecl(), Fn, CGFI); |
2075 | Fn->setDoesNotRecurse(); |
2076 | CodeGenFunction CGF(CGM); |
2077 | CGF.StartFunction(GlobalDecl(), C.VoidTy, Fn, CGFI, Args, Loc, Loc); |
2078 | |
2079 | CGBuilderTy &Bld = CGF.Builder; |
2080 | |
2081 | // This array is used as a medium to transfer, one reduce element at a time, |
2082 | // the data from the first lane of every warp to lanes in the first warp |
2083 | // in order to perform the final step of a reduction in a parallel region |
2084 | // (reduction across warps). The array is placed in NVPTX __shared__ memory |
2085 | // for reduced latency, as well as to have a distinct copy for concurrently |
2086 | // executing target regions. The array is declared with common linkage so |
2087 | // as to be shared across compilation units. |
2088 | StringRef TransferMediumName = |
2089 | "__openmp_nvptx_data_transfer_temporary_storage"; |
2090 | llvm::GlobalVariable *TransferMedium = |
2091 | M.getGlobalVariable(TransferMediumName); |
2092 | unsigned WarpSize = CGF.getTarget().getGridValue(llvm::omp::GV_Warp_Size); |
2093 | if (!TransferMedium) { |
2094 | auto *Ty = llvm::ArrayType::get(CGM.Int32Ty, WarpSize); |
2095 | unsigned SharedAddressSpace = C.getTargetAddressSpace(LangAS::cuda_shared); |
2096 | TransferMedium = new llvm::GlobalVariable( |
2097 | M, Ty, /*isConstant=*/false, llvm::GlobalVariable::WeakAnyLinkage, |
2098 | llvm::UndefValue::get(Ty), TransferMediumName, |
2099 | /*InsertBefore=*/nullptr, llvm::GlobalVariable::NotThreadLocal, |
2100 | SharedAddressSpace); |
2101 | CGM.addCompilerUsedGlobal(TransferMedium); |
2102 | } |
2103 | |
2104 | auto &RT = static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime()); |
2105 | // Get the CUDA thread id of the current OpenMP thread on the GPU. |
2106 | llvm::Value *ThreadID = RT.getGPUThreadID(CGF); |
2107 | // nvptx_lane_id = nvptx_id % warpsize |
2108 | llvm::Value *LaneID = getNVPTXLaneID(CGF); |
2109 | // nvptx_warp_id = nvptx_id / warpsize |
2110 | llvm::Value *WarpID = getNVPTXWarpID(CGF); |
2111 | |
2112 | Address AddrReduceListArg = CGF.GetAddrOfLocalVar(&ReduceListArg); |
2113 | Address LocalReduceList( |
2114 | Bld.CreatePointerBitCastOrAddrSpaceCast( |
2115 | CGF.EmitLoadOfScalar( |
2116 | AddrReduceListArg, /*Volatile=*/false, C.VoidPtrTy, Loc, |
2117 | LValueBaseInfo(AlignmentSource::Type), TBAAAccessInfo()), |
2118 | CGF.ConvertTypeForMem(ReductionArrayTy)->getPointerTo()), |
2119 | CGF.getPointerAlign()); |
2120 | |
2121 | unsigned Idx = 0; |
2122 | for (const Expr *Private : Privates) { |
2123 | // |
2124 | // Warp master copies reduce element to transfer medium in __shared__ |
2125 | // memory. |
2126 | // |
2127 | unsigned RealTySize = |
2128 | C.getTypeSizeInChars(Private->getType()) |
2129 | .alignTo(C.getTypeAlignInChars(Private->getType())) |
2130 | .getQuantity(); |
2131 | for (unsigned TySize = 4; TySize > 0 && RealTySize > 0; TySize /=2) { |
2132 | unsigned NumIters = RealTySize / TySize; |
2133 | if (NumIters == 0) |
2134 | continue; |
2135 | QualType CType = C.getIntTypeForBitwidth( |
2136 | C.toBits(CharUnits::fromQuantity(TySize)), /*Signed=*/1); |
2137 | llvm::Type *CopyType = CGF.ConvertTypeForMem(CType); |
2138 | CharUnits Align = CharUnits::fromQuantity(TySize); |
2139 | llvm::Value *Cnt = nullptr; |
2140 | Address CntAddr = Address::invalid(); |
2141 | llvm::BasicBlock *PrecondBB = nullptr; |
2142 | llvm::BasicBlock *ExitBB = nullptr; |
2143 | if (NumIters > 1) { |
2144 | CntAddr = CGF.CreateMemTemp(C.IntTy, ".cnt.addr"); |
2145 | CGF.EmitStoreOfScalar(llvm::Constant::getNullValue(CGM.IntTy), CntAddr, |
2146 | /*Volatile=*/false, C.IntTy); |
2147 | PrecondBB = CGF.createBasicBlock("precond"); |
2148 | ExitBB = CGF.createBasicBlock("exit"); |
2149 | llvm::BasicBlock *BodyBB = CGF.createBasicBlock("body"); |
2150 | // There is no need to emit line number for unconditional branch. |
2151 | (void)ApplyDebugLocation::CreateEmpty(CGF); |
2152 | CGF.EmitBlock(PrecondBB); |
2153 | Cnt = CGF.EmitLoadOfScalar(CntAddr, /*Volatile=*/false, C.IntTy, Loc); |
2154 | llvm::Value *Cmp = |
2155 | Bld.CreateICmpULT(Cnt, llvm::ConstantInt::get(CGM.IntTy, NumIters)); |
2156 | Bld.CreateCondBr(Cmp, BodyBB, ExitBB); |
2157 | CGF.EmitBlock(BodyBB); |
2158 | } |
2159 | // kmpc_barrier. |
2160 | CGM.getOpenMPRuntime().emitBarrierCall(CGF, Loc, OMPD_unknown, |
2161 | /*EmitChecks=*/false, |
2162 | /*ForceSimpleCall=*/true); |
2163 | llvm::BasicBlock *ThenBB = CGF.createBasicBlock("then"); |
2164 | llvm::BasicBlock *ElseBB = CGF.createBasicBlock("else"); |
2165 | llvm::BasicBlock *MergeBB = CGF.createBasicBlock("ifcont"); |
2166 | |
2167 | // if (lane_id == 0) |
2168 | llvm::Value *IsWarpMaster = Bld.CreateIsNull(LaneID, "warp_master"); |
2169 | Bld.CreateCondBr(IsWarpMaster, ThenBB, ElseBB); |
2170 | CGF.EmitBlock(ThenBB); |
2171 | |
2172 | // Reduce element = LocalReduceList[i] |
2173 | Address ElemPtrPtrAddr = Bld.CreateConstArrayGEP(LocalReduceList, Idx); |
2174 | llvm::Value *ElemPtrPtr = CGF.EmitLoadOfScalar( |
2175 | ElemPtrPtrAddr, /*Volatile=*/false, C.VoidPtrTy, SourceLocation()); |
2176 | // elemptr = ((CopyType*)(elemptrptr)) + I |
2177 | Address ElemPtr = Address(ElemPtrPtr, Align); |
2178 | ElemPtr = Bld.CreateElementBitCast(ElemPtr, CopyType); |
2179 | if (NumIters > 1) { |
2180 | ElemPtr = Address(Bld.CreateGEP(ElemPtr.getElementType(), |
2181 | ElemPtr.getPointer(), Cnt), |
2182 | ElemPtr.getAlignment()); |
2183 | } |
2184 | |
2185 | // Get pointer to location in transfer medium. |
2186 | // MediumPtr = &medium[warp_id] |
2187 | llvm::Value *MediumPtrVal = Bld.CreateInBoundsGEP( |
2188 | TransferMedium->getValueType(), TransferMedium, |
2189 | {llvm::Constant::getNullValue(CGM.Int64Ty), WarpID}); |
2190 | Address MediumPtr(MediumPtrVal, Align); |
2191 | // Casting to actual data type. |
2192 | // MediumPtr = (CopyType*)MediumPtrAddr; |
2193 | MediumPtr = Bld.CreateElementBitCast(MediumPtr, CopyType); |
2194 | |
2195 | // elem = *elemptr |
2196 | //*MediumPtr = elem |
2197 | llvm::Value *Elem = CGF.EmitLoadOfScalar( |
2198 | ElemPtr, /*Volatile=*/false, CType, Loc, |
2199 | LValueBaseInfo(AlignmentSource::Type), TBAAAccessInfo()); |
2200 | // Store the source element value to the dest element address. |
2201 | CGF.EmitStoreOfScalar(Elem, MediumPtr, /*Volatile=*/true, CType, |
2202 | LValueBaseInfo(AlignmentSource::Type), |
2203 | TBAAAccessInfo()); |
2204 | |
2205 | Bld.CreateBr(MergeBB); |
2206 | |
2207 | CGF.EmitBlock(ElseBB); |
2208 | Bld.CreateBr(MergeBB); |
2209 | |
2210 | CGF.EmitBlock(MergeBB); |
2211 | |
2212 | // kmpc_barrier. |
2213 | CGM.getOpenMPRuntime().emitBarrierCall(CGF, Loc, OMPD_unknown, |
2214 | /*EmitChecks=*/false, |
2215 | /*ForceSimpleCall=*/true); |
2216 | |
2217 | // |
2218 | // Warp 0 copies reduce element from transfer medium. |
2219 | // |
2220 | llvm::BasicBlock *W0ThenBB = CGF.createBasicBlock("then"); |
2221 | llvm::BasicBlock *W0ElseBB = CGF.createBasicBlock("else"); |
2222 | llvm::BasicBlock *W0MergeBB = CGF.createBasicBlock("ifcont"); |
2223 | |
2224 | Address AddrNumWarpsArg = CGF.GetAddrOfLocalVar(&NumWarpsArg); |
2225 | llvm::Value *NumWarpsVal = CGF.EmitLoadOfScalar( |
2226 | AddrNumWarpsArg, /*Volatile=*/false, C.IntTy, Loc); |
2227 | |
2228 | // Up to 32 threads in warp 0 are active. |
2229 | llvm::Value *IsActiveThread = |
2230 | Bld.CreateICmpULT(ThreadID, NumWarpsVal, "is_active_thread"); |
2231 | Bld.CreateCondBr(IsActiveThread, W0ThenBB, W0ElseBB); |
2232 | |
2233 | CGF.EmitBlock(W0ThenBB); |
2234 | |
2235 | // SrcMediumPtr = &medium[tid] |
2236 | llvm::Value *SrcMediumPtrVal = Bld.CreateInBoundsGEP( |
2237 | TransferMedium->getValueType(), TransferMedium, |
2238 | {llvm::Constant::getNullValue(CGM.Int64Ty), ThreadID}); |
2239 | Address SrcMediumPtr(SrcMediumPtrVal, Align); |
2240 | // SrcMediumVal = *SrcMediumPtr; |
2241 | SrcMediumPtr = Bld.CreateElementBitCast(SrcMediumPtr, CopyType); |
2242 | |
2243 | // TargetElemPtr = (CopyType*)(SrcDataAddr[i]) + I |
2244 | Address TargetElemPtrPtr = Bld.CreateConstArrayGEP(LocalReduceList, Idx); |
2245 | llvm::Value *TargetElemPtrVal = CGF.EmitLoadOfScalar( |
2246 | TargetElemPtrPtr, /*Volatile=*/false, C.VoidPtrTy, Loc); |
2247 | Address TargetElemPtr = Address(TargetElemPtrVal, Align); |
2248 | TargetElemPtr = Bld.CreateElementBitCast(TargetElemPtr, CopyType); |
2249 | if (NumIters > 1) { |
2250 | TargetElemPtr = Address(Bld.CreateGEP(TargetElemPtr.getElementType(), |
2251 | TargetElemPtr.getPointer(), Cnt), |
2252 | TargetElemPtr.getAlignment()); |
2253 | } |
2254 | |
2255 | // *TargetElemPtr = SrcMediumVal; |
2256 | llvm::Value *SrcMediumValue = |
2257 | CGF.EmitLoadOfScalar(SrcMediumPtr, /*Volatile=*/true, CType, Loc); |
2258 | CGF.EmitStoreOfScalar(SrcMediumValue, TargetElemPtr, /*Volatile=*/false, |
2259 | CType); |
2260 | Bld.CreateBr(W0MergeBB); |
2261 | |
2262 | CGF.EmitBlock(W0ElseBB); |
2263 | Bld.CreateBr(W0MergeBB); |
2264 | |
2265 | CGF.EmitBlock(W0MergeBB); |
2266 | |
2267 | if (NumIters > 1) { |
2268 | Cnt = Bld.CreateNSWAdd(Cnt, llvm::ConstantInt::get(CGM.IntTy, /*V=*/1)); |
2269 | CGF.EmitStoreOfScalar(Cnt, CntAddr, /*Volatile=*/false, C.IntTy); |
2270 | CGF.EmitBranch(PrecondBB); |
2271 | (void)ApplyDebugLocation::CreateEmpty(CGF); |
2272 | CGF.EmitBlock(ExitBB); |
2273 | } |
2274 | RealTySize %= TySize; |
2275 | } |
2276 | ++Idx; |
2277 | } |
2278 | |
2279 | CGF.FinishFunction(); |
2280 | return Fn; |
2281 | } |
2282 | |
2283 | /// Emit a helper that reduces data across two OpenMP threads (lanes) |
2284 | /// in the same warp. It uses shuffle instructions to copy over data from |
2285 | /// a remote lane's stack. The reduction algorithm performed is specified |
2286 | /// by the fourth parameter. |
2287 | /// |
2288 | /// Algorithm Versions. |
2289 | /// Full Warp Reduce (argument value 0): |
2290 | /// This algorithm assumes that all 32 lanes are active and gathers |
2291 | /// data from these 32 lanes, producing a single resultant value. |
2292 | /// Contiguous Partial Warp Reduce (argument value 1): |
2293 | /// This algorithm assumes that only a *contiguous* subset of lanes |
2294 | /// are active. This happens for the last warp in a parallel region |
2295 | /// when the user specified num_threads is not an integer multiple of |
2296 | /// 32. This contiguous subset always starts with the zeroth lane. |
2297 | /// Partial Warp Reduce (argument value 2): |
2298 | /// This algorithm gathers data from any number of lanes at any position. |
2299 | /// All reduced values are stored in the lowest possible lane. The set |
2300 | /// of problems every algorithm addresses is a super set of those |
2301 | /// addressable by algorithms with a lower version number. Overhead |
2302 | /// increases as algorithm version increases. |
2303 | /// |
2304 | /// Terminology |
2305 | /// Reduce element: |
2306 | /// Reduce element refers to the individual data field with primitive |
2307 | /// data types to be combined and reduced across threads. |
2308 | /// Reduce list: |
2309 | /// Reduce list refers to a collection of local, thread-private |
2310 | /// reduce elements. |
2311 | /// Remote Reduce list: |
2312 | /// Remote Reduce list refers to a collection of remote (relative to |
2313 | /// the current thread) reduce elements. |
2314 | /// |
2315 | /// We distinguish between three states of threads that are important to |
2316 | /// the implementation of this function. |
2317 | /// Alive threads: |
2318 | /// Threads in a warp executing the SIMT instruction, as distinguished from |
2319 | /// threads that are inactive due to divergent control flow. |
2320 | /// Active threads: |
2321 | /// The minimal set of threads that has to be alive upon entry to this |
2322 | /// function. The computation is correct iff active threads are alive. |
2323 | /// Some threads are alive but they are not active because they do not |
2324 | /// contribute to the computation in any useful manner. Turning them off |
2325 | /// may introduce control flow overheads without any tangible benefits. |
2326 | /// Effective threads: |
2327 | /// In order to comply with the argument requirements of the shuffle |
2328 | /// function, we must keep all lanes holding data alive. But at most |
2329 | /// half of them perform value aggregation; we refer to this half of |
2330 | /// threads as effective. The other half is simply handing off their |
2331 | /// data. |
2332 | /// |
2333 | /// Procedure |
2334 | /// Value shuffle: |
2335 | /// In this step active threads transfer data from higher lane positions |
2336 | /// in the warp to lower lane positions, creating Remote Reduce list. |
2337 | /// Value aggregation: |
2338 | /// In this step, effective threads combine their thread local Reduce list |
2339 | /// with Remote Reduce list and store the result in the thread local |
2340 | /// Reduce list. |
2341 | /// Value copy: |
2342 | /// In this step, we deal with the assumption made by algorithm 2 |
2343 | /// (i.e. contiguity assumption). When we have an odd number of lanes |
2344 | /// active, say 2k+1, only k threads will be effective and therefore k |
2345 | /// new values will be produced. However, the Reduce list owned by the |
2346 | /// (2k+1)th thread is ignored in the value aggregation. Therefore |
2347 | /// we copy the Reduce list from the (2k+1)th lane to (k+1)th lane so |
2348 | /// that the contiguity assumption still holds. |
2349 | static llvm::Function *emitShuffleAndReduceFunction( |
2350 | CodeGenModule &CGM, ArrayRef<const Expr *> Privates, |
2351 | QualType ReductionArrayTy, llvm::Function *ReduceFn, SourceLocation Loc) { |
2352 | ASTContext &C = CGM.getContext(); |
2353 | |
2354 | // Thread local Reduce list used to host the values of data to be reduced. |
2355 | ImplicitParamDecl ReduceListArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, |
2356 | C.VoidPtrTy, ImplicitParamDecl::Other); |
2357 | // Current lane id; could be logical. |
2358 | ImplicitParamDecl LaneIDArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, C.ShortTy, |
2359 | ImplicitParamDecl::Other); |
2360 | // Offset of the remote source lane relative to the current lane. |
2361 | ImplicitParamDecl RemoteLaneOffsetArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, |
2362 | C.ShortTy, ImplicitParamDecl::Other); |
2363 | // Algorithm version. This is expected to be known at compile time. |
2364 | ImplicitParamDecl AlgoVerArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, |
2365 | C.ShortTy, ImplicitParamDecl::Other); |
2366 | FunctionArgList Args; |
2367 | Args.push_back(&ReduceListArg); |
2368 | Args.push_back(&LaneIDArg); |
2369 | Args.push_back(&RemoteLaneOffsetArg); |
2370 | Args.push_back(&AlgoVerArg); |
2371 | |
2372 | const CGFunctionInfo &CGFI = |
2373 | CGM.getTypes().arrangeBuiltinFunctionDeclaration(C.VoidTy, Args); |
2374 | auto *Fn = llvm::Function::Create( |
2375 | CGM.getTypes().GetFunctionType(CGFI), llvm::GlobalValue::InternalLinkage, |
2376 | "_omp_reduction_shuffle_and_reduce_func", &CGM.getModule()); |
2377 | CGM.SetInternalFunctionAttributes(GlobalDecl(), Fn, CGFI); |
2378 | Fn->setDoesNotRecurse(); |
2379 | |
2380 | CodeGenFunction CGF(CGM); |
2381 | CGF.StartFunction(GlobalDecl(), C.VoidTy, Fn, CGFI, Args, Loc, Loc); |
2382 | |
2383 | CGBuilderTy &Bld = CGF.Builder; |
2384 | |
2385 | Address AddrReduceListArg = CGF.GetAddrOfLocalVar(&ReduceListArg); |
2386 | Address LocalReduceList( |
2387 | Bld.CreatePointerBitCastOrAddrSpaceCast( |
2388 | CGF.EmitLoadOfScalar(AddrReduceListArg, /*Volatile=*/false, |
2389 | C.VoidPtrTy, SourceLocation()), |
2390 | CGF.ConvertTypeForMem(ReductionArrayTy)->getPointerTo()), |
2391 | CGF.getPointerAlign()); |
2392 | |
2393 | Address AddrLaneIDArg = CGF.GetAddrOfLocalVar(&LaneIDArg); |
2394 | llvm::Value *LaneIDArgVal = CGF.EmitLoadOfScalar( |
2395 | AddrLaneIDArg, /*Volatile=*/false, C.ShortTy, SourceLocation()); |
2396 | |
2397 | Address AddrRemoteLaneOffsetArg = CGF.GetAddrOfLocalVar(&RemoteLaneOffsetArg); |
2398 | llvm::Value *RemoteLaneOffsetArgVal = CGF.EmitLoadOfScalar( |
2399 | AddrRemoteLaneOffsetArg, /*Volatile=*/false, C.ShortTy, SourceLocation()); |
2400 | |
2401 | Address AddrAlgoVerArg = CGF.GetAddrOfLocalVar(&AlgoVerArg); |
2402 | llvm::Value *AlgoVerArgVal = CGF.EmitLoadOfScalar( |
2403 | AddrAlgoVerArg, /*Volatile=*/false, C.ShortTy, SourceLocation()); |
2404 | |
2405 | // Create a local thread-private variable to host the Reduce list |
2406 | // from a remote lane. |
2407 | Address RemoteReduceList = |
2408 | CGF.CreateMemTemp(ReductionArrayTy, ".omp.reduction.remote_reduce_list"); |
2409 | |
2410 | // This loop iterates through the list of reduce elements and copies, |
2411 | // element by element, from a remote lane in the warp to RemoteReduceList, |
2412 | // hosted on the thread's stack. |
2413 | emitReductionListCopy(RemoteLaneToThread, CGF, ReductionArrayTy, Privates, |
2414 | LocalReduceList, RemoteReduceList, |
2415 | {/*RemoteLaneOffset=*/RemoteLaneOffsetArgVal, |
2416 | /*ScratchpadIndex=*/nullptr, |
2417 | /*ScratchpadWidth=*/nullptr}); |
2418 | |
2419 | // The actions to be performed on the Remote Reduce list is dependent |
2420 | // on the algorithm version. |
2421 | // |
2422 | // if (AlgoVer==0) || (AlgoVer==1 && (LaneId < Offset)) || (AlgoVer==2 && |
2423 | // LaneId % 2 == 0 && Offset > 0): |
2424 | // do the reduction value aggregation |
2425 | // |
2426 | // The thread local variable Reduce list is mutated in place to host the |
2427 | // reduced data, which is the aggregated value produced from local and |
2428 | // remote lanes. |
2429 | // |
2430 | // Note that AlgoVer is expected to be a constant integer known at compile |
2431 | // time. |
2432 | // When AlgoVer==0, the first conjunction evaluates to true, making |
2433 | // the entire predicate true during compile time. |
2434 | // When AlgoVer==1, the second conjunction has only the second part to be |
2435 | // evaluated during runtime. Other conjunctions evaluates to false |
2436 | // during compile time. |
2437 | // When AlgoVer==2, the third conjunction has only the second part to be |
2438 | // evaluated during runtime. Other conjunctions evaluates to false |
2439 | // during compile time. |
2440 | llvm::Value *CondAlgo0 = Bld.CreateIsNull(AlgoVerArgVal); |
2441 | |
2442 | llvm::Value *Algo1 = Bld.CreateICmpEQ(AlgoVerArgVal, Bld.getInt16(1)); |
2443 | llvm::Value *CondAlgo1 = Bld.CreateAnd( |
2444 | Algo1, Bld.CreateICmpULT(LaneIDArgVal, RemoteLaneOffsetArgVal)); |
2445 | |
2446 | llvm::Value *Algo2 = Bld.CreateICmpEQ(AlgoVerArgVal, Bld.getInt16(2)); |
2447 | llvm::Value *CondAlgo2 = Bld.CreateAnd( |
2448 | Algo2, Bld.CreateIsNull(Bld.CreateAnd(LaneIDArgVal, Bld.getInt16(1)))); |
2449 | CondAlgo2 = Bld.CreateAnd( |
2450 | CondAlgo2, Bld.CreateICmpSGT(RemoteLaneOffsetArgVal, Bld.getInt16(0))); |
2451 | |
2452 | llvm::Value *CondReduce = Bld.CreateOr(CondAlgo0, CondAlgo1); |
2453 | CondReduce = Bld.CreateOr(CondReduce, CondAlgo2); |
2454 | |
2455 | llvm::BasicBlock *ThenBB = CGF.createBasicBlock("then"); |
2456 | llvm::BasicBlock *ElseBB = CGF.createBasicBlock("else"); |
2457 | llvm::BasicBlock *MergeBB = CGF.createBasicBlock("ifcont"); |
2458 | Bld.CreateCondBr(CondReduce, ThenBB, ElseBB); |
2459 | |
2460 | CGF.EmitBlock(ThenBB); |
2461 | // reduce_function(LocalReduceList, RemoteReduceList) |
2462 | llvm::Value *LocalReduceListPtr = Bld.CreatePointerBitCastOrAddrSpaceCast( |
2463 | LocalReduceList.getPointer(), CGF.VoidPtrTy); |
2464 | llvm::Value *RemoteReduceListPtr = Bld.CreatePointerBitCastOrAddrSpaceCast( |
2465 | RemoteReduceList.getPointer(), CGF.VoidPtrTy); |
2466 | CGM.getOpenMPRuntime().emitOutlinedFunctionCall( |
2467 | CGF, Loc, ReduceFn, {LocalReduceListPtr, RemoteReduceListPtr}); |
2468 | Bld.CreateBr(MergeBB); |
2469 | |
2470 | CGF.EmitBlock(ElseBB); |
2471 | Bld.CreateBr(MergeBB); |
2472 | |
2473 | CGF.EmitBlock(MergeBB); |
2474 | |
2475 | // if (AlgoVer==1 && (LaneId >= Offset)) copy Remote Reduce list to local |
2476 | // Reduce list. |
2477 | Algo1 = Bld.CreateICmpEQ(AlgoVerArgVal, Bld.getInt16(1)); |
2478 | llvm::Value *CondCopy = Bld.CreateAnd( |
2479 | Algo1, Bld.CreateICmpUGE(LaneIDArgVal, RemoteLaneOffsetArgVal)); |
2480 | |
2481 | llvm::BasicBlock *CpyThenBB = CGF.createBasicBlock("then"); |
2482 | llvm::BasicBlock *CpyElseBB = CGF.createBasicBlock("else"); |
2483 | llvm::BasicBlock *CpyMergeBB = CGF.createBasicBlock("ifcont"); |
2484 | Bld.CreateCondBr(CondCopy, CpyThenBB, CpyElseBB); |
2485 | |
2486 | CGF.EmitBlock(CpyThenBB); |
2487 | emitReductionListCopy(ThreadCopy, CGF, ReductionArrayTy, Privates, |
2488 | RemoteReduceList, LocalReduceList); |
2489 | Bld.CreateBr(CpyMergeBB); |
2490 | |
2491 | CGF.EmitBlock(CpyElseBB); |
2492 | Bld.CreateBr(CpyMergeBB); |
2493 | |
2494 | CGF.EmitBlock(CpyMergeBB); |
2495 | |
2496 | CGF.FinishFunction(); |
2497 | return Fn; |
2498 | } |
2499 | |
2500 | /// This function emits a helper that copies all the reduction variables from |
2501 | /// the team into the provided global buffer for the reduction variables. |
2502 | /// |
2503 | /// void list_to_global_copy_func(void *buffer, int Idx, void *reduce_data) |
2504 | /// For all data entries D in reduce_data: |
2505 | /// Copy local D to buffer.D[Idx] |
2506 | static llvm::Value *emitListToGlobalCopyFunction( |
2507 | CodeGenModule &CGM, ArrayRef<const Expr *> Privates, |
2508 | QualType ReductionArrayTy, SourceLocation Loc, |
2509 | const RecordDecl *TeamReductionRec, |
2510 | const llvm::SmallDenseMap<const ValueDecl *, const FieldDecl *> |
2511 | &VarFieldMap) { |
2512 | ASTContext &C = CGM.getContext(); |
2513 | |
2514 | // Buffer: global reduction buffer. |
2515 | ImplicitParamDecl BufferArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, |
2516 | C.VoidPtrTy, ImplicitParamDecl::Other); |
2517 | // Idx: index of the buffer. |
2518 | ImplicitParamDecl IdxArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, C.IntTy, |
2519 | ImplicitParamDecl::Other); |
2520 | // ReduceList: thread local Reduce list. |
2521 | ImplicitParamDecl ReduceListArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, |
2522 | C.VoidPtrTy, ImplicitParamDecl::Other); |
2523 | FunctionArgList Args; |
2524 | Args.push_back(&BufferArg); |
2525 | Args.push_back(&IdxArg); |
2526 | Args.push_back(&ReduceListArg); |
2527 | |
2528 | const CGFunctionInfo &CGFI = |
2529 | CGM.getTypes().arrangeBuiltinFunctionDeclaration(C.VoidTy, Args); |
2530 | auto *Fn = llvm::Function::Create( |
2531 | CGM.getTypes().GetFunctionType(CGFI), llvm::GlobalValue::InternalLinkage, |
2532 | "_omp_reduction_list_to_global_copy_func", &CGM.getModule()); |
2533 | CGM.SetInternalFunctionAttributes(GlobalDecl(), Fn, CGFI); |
2534 | Fn->setDoesNotRecurse(); |
2535 | CodeGenFunction CGF(CGM); |
2536 | CGF.StartFunction(GlobalDecl(), C.VoidTy, Fn, CGFI, Args, Loc, Loc); |
2537 | |
2538 | CGBuilderTy &Bld = CGF.Builder; |
2539 | |
2540 | Address AddrReduceListArg = CGF.GetAddrOfLocalVar(&ReduceListArg); |
2541 | Address AddrBufferArg = CGF.GetAddrOfLocalVar(&BufferArg); |
2542 | Address LocalReduceList( |
2543 | Bld.CreatePointerBitCastOrAddrSpaceCast( |
2544 | CGF.EmitLoadOfScalar(AddrReduceListArg, /*Volatile=*/false, |
2545 | C.VoidPtrTy, Loc), |
2546 | CGF.ConvertTypeForMem(ReductionArrayTy)->getPointerTo()), |
2547 | CGF.getPointerAlign()); |
2548 | QualType StaticTy = C.getRecordType(TeamReductionRec); |
2549 | llvm::Type *LLVMReductionsBufferTy = |
2550 | CGM.getTypes().ConvertTypeForMem(StaticTy); |
2551 | llvm::Value *BufferArrPtr = Bld.CreatePointerBitCastOrAddrSpaceCast( |
2552 | CGF.EmitLoadOfScalar(AddrBufferArg, /*Volatile=*/false, C.VoidPtrTy, Loc), |
2553 | LLVMReductionsBufferTy->getPointerTo()); |
2554 | llvm::Value *Idxs[] = {llvm::ConstantInt::getNullValue(CGF.Int32Ty), |
2555 | CGF.EmitLoadOfScalar(CGF.GetAddrOfLocalVar(&IdxArg), |
2556 | /*Volatile=*/false, C.IntTy, |
2557 | Loc)}; |
2558 | unsigned Idx = 0; |
2559 | for (const Expr *Private : Privates) { |
2560 | // Reduce element = LocalReduceList[i] |
2561 | Address ElemPtrPtrAddr = Bld.CreateConstArrayGEP(LocalReduceList, Idx); |
2562 | llvm::Value *ElemPtrPtr = CGF.EmitLoadOfScalar( |
2563 | ElemPtrPtrAddr, /*Volatile=*/false, C.VoidPtrTy, SourceLocation()); |
2564 | // elemptr = ((CopyType*)(elemptrptr)) + I |
2565 | ElemPtrPtr = Bld.CreatePointerBitCastOrAddrSpaceCast( |
2566 | ElemPtrPtr, CGF.ConvertTypeForMem(Private->getType())->getPointerTo()); |
2567 | Address ElemPtr = |
2568 | Address(ElemPtrPtr, C.getTypeAlignInChars(Private->getType())); |
2569 | const ValueDecl *VD = cast<DeclRefExpr>(Private)->getDecl(); |
2570 | // Global = Buffer.VD[Idx]; |
2571 | const FieldDecl *FD = VarFieldMap.lookup(VD); |
2572 | LValue GlobLVal = CGF.EmitLValueForField( |
2573 | CGF.MakeNaturalAlignAddrLValue(BufferArrPtr, StaticTy), FD); |
2574 | Address GlobAddr = GlobLVal.getAddress(CGF); |
2575 | llvm::Value *BufferPtr = Bld.CreateInBoundsGEP( |
2576 | GlobAddr.getElementType(), GlobAddr.getPointer(), Idxs); |
2577 | GlobLVal.setAddress(Address(BufferPtr, GlobAddr.getAlignment())); |
2578 | switch (CGF.getEvaluationKind(Private->getType())) { |
2579 | case TEK_Scalar: { |
2580 | llvm::Value *V = CGF.EmitLoadOfScalar( |
2581 | ElemPtr, /*Volatile=*/false, Private->getType(), Loc, |
2582 | LValueBaseInfo(AlignmentSource::Type), TBAAAccessInfo()); |
2583 | CGF.EmitStoreOfScalar(V, GlobLVal); |
2584 | break; |
2585 | } |
2586 | case TEK_Complex: { |
2587 | CodeGenFunction::ComplexPairTy V = CGF.EmitLoadOfComplex( |
2588 | CGF.MakeAddrLValue(ElemPtr, Private->getType()), Loc); |
2589 | CGF.EmitStoreOfComplex(V, GlobLVal, /*isInit=*/false); |
2590 | break; |
2591 | } |
2592 | case TEK_Aggregate: |
2593 | CGF.EmitAggregateCopy(GlobLVal, |
2594 | CGF.MakeAddrLValue(ElemPtr, Private->getType()), |
2595 | Private->getType(), AggValueSlot::DoesNotOverlap); |
2596 | break; |
2597 | } |
2598 | ++Idx; |
2599 | } |
2600 | |
2601 | CGF.FinishFunction(); |
2602 | return Fn; |
2603 | } |
2604 | |
2605 | /// This function emits a helper that reduces all the reduction variables from |
2606 | /// the team into the provided global buffer for the reduction variables. |
2607 | /// |
2608 | /// void list_to_global_reduce_func(void *buffer, int Idx, void *reduce_data) |
2609 | /// void *GlobPtrs[]; |
2610 | /// GlobPtrs[0] = (void*)&buffer.D0[Idx]; |
2611 | /// ... |
2612 | /// GlobPtrs[N] = (void*)&buffer.DN[Idx]; |
2613 | /// reduce_function(GlobPtrs, reduce_data); |
2614 | static llvm::Value *emitListToGlobalReduceFunction( |
2615 | CodeGenModule &CGM, ArrayRef<const Expr *> Privates, |
2616 | QualType ReductionArrayTy, SourceLocation Loc, |
2617 | const RecordDecl *TeamReductionRec, |
2618 | const llvm::SmallDenseMap<const ValueDecl *, const FieldDecl *> |
2619 | &VarFieldMap, |
2620 | llvm::Function *ReduceFn) { |
2621 | ASTContext &C = CGM.getContext(); |
2622 | |
2623 | // Buffer: global reduction buffer. |
2624 | ImplicitParamDecl BufferArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, |
2625 | C.VoidPtrTy, ImplicitParamDecl::Other); |
2626 | // Idx: index of the buffer. |
2627 | ImplicitParamDecl IdxArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, C.IntTy, |
2628 | ImplicitParamDecl::Other); |
2629 | // ReduceList: thread local Reduce list. |
2630 | ImplicitParamDecl ReduceListArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, |
2631 | C.VoidPtrTy, ImplicitParamDecl::Other); |
2632 | FunctionArgList Args; |
2633 | Args.push_back(&BufferArg); |
2634 | Args.push_back(&IdxArg); |
2635 | Args.push_back(&ReduceListArg); |
2636 | |
2637 | const CGFunctionInfo &CGFI = |
2638 | CGM.getTypes().arrangeBuiltinFunctionDeclaration(C.VoidTy, Args); |
2639 | auto *Fn = llvm::Function::Create( |
2640 | CGM.getTypes().GetFunctionType(CGFI), llvm::GlobalValue::InternalLinkage, |
2641 | "_omp_reduction_list_to_global_reduce_func", &CGM.getModule()); |
2642 | CGM.SetInternalFunctionAttributes(GlobalDecl(), Fn, CGFI); |
2643 | Fn->setDoesNotRecurse(); |
2644 | CodeGenFunction CGF(CGM); |
2645 | CGF.StartFunction(GlobalDecl(), C.VoidTy, Fn, CGFI, Args, Loc, Loc); |
2646 | |
2647 | CGBuilderTy &Bld = CGF.Builder; |
2648 | |
2649 | Address AddrBufferArg = CGF.GetAddrOfLocalVar(&BufferArg); |
2650 | QualType StaticTy = C.getRecordType(TeamReductionRec); |
2651 | llvm::Type *LLVMReductionsBufferTy = |
2652 | CGM.getTypes().ConvertTypeForMem(StaticTy); |
2653 | llvm::Value *BufferArrPtr = Bld.CreatePointerBitCastOrAddrSpaceCast( |
2654 | CGF.EmitLoadOfScalar(AddrBufferArg, /*Volatile=*/false, C.VoidPtrTy, Loc), |
2655 | LLVMReductionsBufferTy->getPointerTo()); |
2656 | |
2657 | // 1. Build a list of reduction variables. |
2658 | // void *RedList[<n>] = {<ReductionVars>[0], ..., <ReductionVars>[<n>-1]}; |
2659 | Address ReductionList = |
2660 | CGF.CreateMemTemp(ReductionArrayTy, ".omp.reduction.red_list"); |
2661 | auto IPriv = Privates.begin(); |
2662 | llvm::Value *Idxs[] = {llvm::ConstantInt::getNullValue(CGF.Int32Ty), |
2663 | CGF.EmitLoadOfScalar(CGF.GetAddrOfLocalVar(&IdxArg), |
2664 | /*Volatile=*/false, C.IntTy, |
2665 | Loc)}; |
2666 | unsigned Idx = 0; |
2667 | for (unsigned I = 0, E = Privates.size(); I < E; ++I, ++IPriv, ++Idx) { |
2668 | Address Elem = CGF.Builder.CreateConstArrayGEP(ReductionList, Idx); |
2669 | // Global = Buffer.VD[Idx]; |
2670 | const ValueDecl *VD = cast<DeclRefExpr>(*IPriv)->getDecl(); |
2671 | const FieldDecl *FD = VarFieldMap.lookup(VD); |
2672 | LValue GlobLVal = CGF.EmitLValueForField( |
2673 | CGF.MakeNaturalAlignAddrLValue(BufferArrPtr, StaticTy), FD); |
2674 | Address GlobAddr = GlobLVal.getAddress(CGF); |
2675 | llvm::Value *BufferPtr = Bld.CreateInBoundsGEP( |
2676 | GlobAddr.getElementType(), GlobAddr.getPointer(), Idxs); |
2677 | llvm::Value *Ptr = CGF.EmitCastToVoidPtr(BufferPtr); |
2678 | CGF.EmitStoreOfScalar(Ptr, Elem, /*Volatile=*/false, C.VoidPtrTy); |
2679 | if ((*IPriv)->getType()->isVariablyModifiedType()) { |
2680 | // Store array size. |
2681 | ++Idx; |
2682 | Elem = CGF.Builder.CreateConstArrayGEP(ReductionList, Idx); |
2683 | llvm::Value *Size = CGF.Builder.CreateIntCast( |
2684 | CGF.getVLASize( |
2685 | CGF.getContext().getAsVariableArrayType((*IPriv)->getType())) |
2686 | .NumElts, |
2687 | CGF.SizeTy, /*isSigned=*/false); |
2688 | CGF.Builder.CreateStore(CGF.Builder.CreateIntToPtr(Size, CGF.VoidPtrTy), |
2689 | Elem); |
2690 | } |
2691 | } |
2692 | |
2693 | // Call reduce_function(GlobalReduceList, ReduceList) |
2694 | llvm::Value *GlobalReduceList = |
2695 | CGF.EmitCastToVoidPtr(ReductionList.getPointer()); |
2696 | Address AddrReduceListArg = CGF.GetAddrOfLocalVar(&ReduceListArg); |
2697 | llvm::Value *ReducedPtr = CGF.EmitLoadOfScalar( |
2698 | AddrReduceListArg, /*Volatile=*/false, C.VoidPtrTy, Loc); |
2699 | CGM.getOpenMPRuntime().emitOutlinedFunctionCall( |
2700 | CGF, Loc, ReduceFn, {GlobalReduceList, ReducedPtr}); |
2701 | CGF.FinishFunction(); |
2702 | return Fn; |
2703 | } |
2704 | |
2705 | /// This function emits a helper that copies all the reduction variables from |
2706 | /// the team into the provided global buffer for the reduction variables. |
2707 | /// |
2708 | /// void list_to_global_copy_func(void *buffer, int Idx, void *reduce_data) |
2709 | /// For all data entries D in reduce_data: |
2710 | /// Copy buffer.D[Idx] to local D; |
2711 | static llvm::Value *emitGlobalToListCopyFunction( |
2712 | CodeGenModule &CGM, ArrayRef<const Expr *> Privates, |
2713 | QualType ReductionArrayTy, SourceLocation Loc, |
2714 | const RecordDecl *TeamReductionRec, |
2715 | const llvm::SmallDenseMap<const ValueDecl *, const FieldDecl *> |
2716 | &VarFieldMap) { |
2717 | ASTContext &C = CGM.getContext(); |
2718 | |
2719 | // Buffer: global reduction buffer. |
2720 | ImplicitParamDecl BufferArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, |
2721 | C.VoidPtrTy, ImplicitParamDecl::Other); |
2722 | // Idx: index of the buffer. |
2723 | ImplicitParamDecl IdxArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, C.IntTy, |
2724 | ImplicitParamDecl::Other); |
2725 | // ReduceList: thread local Reduce list. |
2726 | ImplicitParamDecl ReduceListArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, |
2727 | C.VoidPtrTy, ImplicitParamDecl::Other); |
2728 | FunctionArgList Args; |
2729 | Args.push_back(&BufferArg); |
2730 | Args.push_back(&IdxArg); |
2731 | Args.push_back(&ReduceListArg); |
2732 | |
2733 | const CGFunctionInfo &CGFI = |
2734 | CGM.getTypes().arrangeBuiltinFunctionDeclaration(C.VoidTy, Args); |
2735 | auto *Fn = llvm::Function::Create( |
2736 | CGM.getTypes().GetFunctionType(CGFI), llvm::GlobalValue::InternalLinkage, |
2737 | "_omp_reduction_global_to_list_copy_func", &CGM.getModule()); |
2738 | CGM.SetInternalFunctionAttributes(GlobalDecl(), Fn, CGFI); |
2739 | Fn->setDoesNotRecurse(); |
2740 | CodeGenFunction CGF(CGM); |
2741 | CGF.StartFunction(GlobalDecl(), C.VoidTy, Fn, CGFI, Args, Loc, Loc); |
2742 | |
2743 | CGBuilderTy &Bld = CGF.Builder; |
2744 | |
2745 | Address AddrReduceListArg = CGF.GetAddrOfLocalVar(&ReduceListArg); |
2746 | Address AddrBufferArg = CGF.GetAddrOfLocalVar(&BufferArg); |
2747 | Address LocalReduceList( |
2748 | Bld.CreatePointerBitCastOrAddrSpaceCast( |
2749 | CGF.EmitLoadOfScalar(AddrReduceListArg, /*Volatile=*/false, |
2750 | C.VoidPtrTy, Loc), |
2751 | CGF.ConvertTypeForMem(ReductionArrayTy)->getPointerTo()), |
2752 | CGF.getPointerAlign()); |
2753 | QualType StaticTy = C.getRecordType(TeamReductionRec); |
2754 | llvm::Type *LLVMReductionsBufferTy = |
2755 | CGM.getTypes().ConvertTypeForMem(StaticTy); |
2756 | llvm::Value *BufferArrPtr = Bld.CreatePointerBitCastOrAddrSpaceCast( |
2757 | CGF.EmitLoadOfScalar(AddrBufferArg, /*Volatile=*/false, C.VoidPtrTy, Loc), |
2758 | LLVMReductionsBufferTy->getPointerTo()); |
2759 | |
2760 | llvm::Value *Idxs[] = {llvm::ConstantInt::getNullValue(CGF.Int32Ty), |
2761 | CGF.EmitLoadOfScalar(CGF.GetAddrOfLocalVar(&IdxArg), |
2762 | /*Volatile=*/false, C.IntTy, |
2763 | Loc)}; |
2764 | unsigned Idx = 0; |
2765 | for (const Expr *Private : Privates) { |
2766 | // Reduce element = LocalReduceList[i] |
2767 | Address ElemPtrPtrAddr = Bld.CreateConstArrayGEP(LocalReduceList, Idx); |
2768 | llvm::Value *ElemPtrPtr = CGF.EmitLoadOfScalar( |
2769 | ElemPtrPtrAddr, /*Volatile=*/false, C.VoidPtrTy, SourceLocation()); |
2770 | // elemptr = ((CopyType*)(elemptrptr)) + I |
2771 | ElemPtrPtr = Bld.CreatePointerBitCastOrAddrSpaceCast( |
2772 | ElemPtrPtr, CGF.ConvertTypeForMem(Private->getType())->getPointerTo()); |
2773 | Address ElemPtr = |
2774 | Address(ElemPtrPtr, C.getTypeAlignInChars(Private->getType())); |
2775 | const ValueDecl *VD = cast<DeclRefExpr>(Private)->getDecl(); |
2776 | // Global = Buffer.VD[Idx]; |
2777 | const FieldDecl *FD = VarFieldMap.lookup(VD); |
2778 | LValue GlobLVal = CGF.EmitLValueForField( |
2779 | CGF.MakeNaturalAlignAddrLValue(BufferArrPtr, StaticTy), FD); |
2780 | Address GlobAddr = GlobLVal.getAddress(CGF); |
2781 | llvm::Value *BufferPtr = Bld.CreateInBoundsGEP( |
2782 | GlobAddr.getElementType(), GlobAddr.getPointer(), Idxs); |
2783 | GlobLVal.setAddress(Address(BufferPtr, GlobAddr.getAlignment())); |
2784 | switch (CGF.getEvaluationKind(Private->getType())) { |
2785 | case TEK_Scalar: { |
2786 | llvm::Value *V = CGF.EmitLoadOfScalar(GlobLVal, Loc); |
2787 | CGF.EmitStoreOfScalar(V, ElemPtr, /*Volatile=*/false, Private->getType(), |
2788 | LValueBaseInfo(AlignmentSource::Type), |
2789 | TBAAAccessInfo()); |
2790 | break; |
2791 | } |
2792 | case TEK_Complex: { |
2793 | CodeGenFunction::ComplexPairTy V = CGF.EmitLoadOfComplex(GlobLVal, Loc); |
2794 | CGF.EmitStoreOfComplex(V, CGF.MakeAddrLValue(ElemPtr, Private->getType()), |
2795 | /*isInit=*/false); |
2796 | break; |
2797 | } |
2798 | case TEK_Aggregate: |
2799 | CGF.EmitAggregateCopy(CGF.MakeAddrLValue(ElemPtr, Private->getType()), |
2800 | GlobLVal, Private->getType(), |
2801 | AggValueSlot::DoesNotOverlap); |
2802 | break; |
2803 | } |
2804 | ++Idx; |
2805 | } |
2806 | |
2807 | CGF.FinishFunction(); |
2808 | return Fn; |
2809 | } |
2810 | |
2811 | /// This function emits a helper that reduces all the reduction variables from |
2812 | /// the team into the provided global buffer for the reduction variables. |
2813 | /// |
2814 | /// void global_to_list_reduce_func(void *buffer, int Idx, void *reduce_data) |
2815 | /// void *GlobPtrs[]; |
2816 | /// GlobPtrs[0] = (void*)&buffer.D0[Idx]; |
2817 | /// ... |
2818 | /// GlobPtrs[N] = (void*)&buffer.DN[Idx]; |
2819 | /// reduce_function(reduce_data, GlobPtrs); |
2820 | static llvm::Value *emitGlobalToListReduceFunction( |
2821 | CodeGenModule &CGM, ArrayRef<const Expr *> Privates, |
2822 | QualType ReductionArrayTy, SourceLocation Loc, |
2823 | const RecordDecl *TeamReductionRec, |
2824 | const llvm::SmallDenseMap<const ValueDecl *, const FieldDecl *> |
2825 | &VarFieldMap, |
2826 | llvm::Function *ReduceFn) { |
2827 | ASTContext &C = CGM.getContext(); |
2828 | |
2829 | // Buffer: global reduction buffer. |
2830 | ImplicitParamDecl BufferArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, |
2831 | C.VoidPtrTy, ImplicitParamDecl::Other); |
2832 | // Idx: index of the buffer. |
2833 | ImplicitParamDecl IdxArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, C.IntTy, |
2834 | ImplicitParamDecl::Other); |
2835 | // ReduceList: thread local Reduce list. |
2836 | ImplicitParamDecl ReduceListArg(C, /*DC=*/nullptr, Loc, /*Id=*/nullptr, |
2837 | C.VoidPtrTy, ImplicitParamDecl::Other); |
2838 | FunctionArgList Args; |
2839 | Args.push_back(&BufferArg); |
2840 | Args.push_back(&IdxArg); |
2841 | Args.push_back(&ReduceListArg); |
2842 | |
2843 | const CGFunctionInfo &CGFI = |
2844 | CGM.getTypes().arrangeBuiltinFunctionDeclaration(C.VoidTy, Args); |
2845 | auto *Fn = llvm::Function::Create( |
2846 | CGM.getTypes().GetFunctionType(CGFI), llvm::GlobalValue::InternalLinkage, |
2847 | "_omp_reduction_global_to_list_reduce_func", &CGM.getModule()); |
2848 | CGM.SetInternalFunctionAttributes(GlobalDecl(), Fn, CGFI); |
2849 | Fn->setDoesNotRecurse(); |
2850 | CodeGenFunction CGF(CGM); |
2851 | CGF.StartFunction(GlobalDecl(), C.VoidTy, Fn, CGFI, Args, Loc, Loc); |
2852 | |
2853 | CGBuilderTy &Bld = CGF.Builder; |
2854 | |
2855 | Address AddrBufferArg = CGF.GetAddrOfLocalVar(&BufferArg); |
2856 | QualType StaticTy = C.getRecordType(TeamReductionRec); |
2857 | llvm::Type *LLVMReductionsBufferTy = |
2858 | CGM.getTypes().ConvertTypeForMem(StaticTy); |
2859 | llvm::Value *BufferArrPtr = Bld.CreatePointerBitCastOrAddrSpaceCast( |
2860 | CGF.EmitLoadOfScalar(AddrBufferArg, /*Volatile=*/false, C.VoidPtrTy, Loc), |
2861 | LLVMReductionsBufferTy->getPointerTo()); |
2862 | |
2863 | // 1. Build a list of reduction variables. |
2864 | // void *RedList[<n>] = {<ReductionVars>[0], ..., <ReductionVars>[<n>-1]}; |
2865 | Address ReductionList = |
2866 | CGF.CreateMemTemp(ReductionArrayTy, ".omp.reduction.red_list"); |
2867 | auto IPriv = Privates.begin(); |
2868 | llvm::Value *Idxs[] = {llvm::ConstantInt::getNullValue(CGF.Int32Ty), |
2869 | CGF.EmitLoadOfScalar(CGF.GetAddrOfLocalVar(&IdxArg), |
2870 | /*Volatile=*/false, C.IntTy, |
2871 | Loc)}; |
2872 | unsigned Idx = 0; |
2873 | for (unsigned I = 0, E = Privates.size(); I < E; ++I, ++IPriv, ++Idx) { |
2874 | Address Elem = CGF.Builder.CreateConstArrayGEP(ReductionList, Idx); |
2875 | // Global = Buffer.VD[Idx]; |
2876 | const ValueDecl *VD = cast<DeclRefExpr>(*IPriv)->getDecl(); |
2877 | const FieldDecl *FD = VarFieldMap.lookup(VD); |
2878 | LValue GlobLVal = CGF.EmitLValueForField( |
2879 | CGF.MakeNaturalAlignAddrLValue(BufferArrPtr, StaticTy), FD); |
2880 | Address GlobAddr = GlobLVal.getAddress(CGF); |
2881 | llvm::Value *BufferPtr = Bld.CreateInBoundsGEP( |
2882 | GlobAddr.getElementType(), GlobAddr.getPointer(), Idxs); |
2883 | llvm::Value *Ptr = CGF.EmitCastToVoidPtr(BufferPtr); |
2884 | CGF.EmitStoreOfScalar(Ptr, Elem, /*Volatile=*/false, C.VoidPtrTy); |
2885 | if ((*IPriv)->getType()->isVariablyModifiedType()) { |
2886 | // Store array size. |
2887 | ++Idx; |
2888 | Elem = CGF.Builder.CreateConstArrayGEP(ReductionList, Idx); |
2889 | llvm::Value *Size = CGF.Builder.CreateIntCast( |
2890 | CGF.getVLASize( |
2891 | CGF.getContext().getAsVariableArrayType((*IPriv)->getType())) |
2892 | .NumElts, |
2893 | CGF.SizeTy, /*isSigned=*/false); |
2894 | CGF.Builder.CreateStore(CGF.Builder.CreateIntToPtr(Size, CGF.VoidPtrTy), |
2895 | Elem); |
2896 | } |
2897 | } |
2898 | |
2899 | // Call reduce_function(ReduceList, GlobalReduceList) |
2900 | llvm::Value *GlobalReduceList = |
2901 | CGF.EmitCastToVoidPtr(ReductionList.getPointer()); |
2902 | Address AddrReduceListArg = CGF.GetAddrOfLocalVar(&ReduceListArg); |
2903 | llvm::Value *ReducedPtr = CGF.EmitLoadOfScalar( |
2904 | AddrReduceListArg, /*Volatile=*/false, C.VoidPtrTy, Loc); |
2905 | CGM.getOpenMPRuntime().emitOutlinedFunctionCall( |
2906 | CGF, Loc, ReduceFn, {ReducedPtr, GlobalReduceList}); |
2907 | CGF.FinishFunction(); |
2908 | return Fn; |
2909 | } |
2910 | |
2911 | /// |
2912 | /// Design of OpenMP reductions on the GPU |
2913 | /// |
2914 | /// Consider a typical OpenMP program with one or more reduction |
2915 | /// clauses: |
2916 | /// |
2917 | /// float foo; |
2918 | /// double bar; |
2919 | /// #pragma omp target teams distribute parallel for \ |
2920 | /// reduction(+:foo) reduction(*:bar) |
2921 | /// for (int i = 0; i < N; i++) { |
2922 | /// foo += A[i]; bar *= B[i]; |
2923 | /// } |
2924 | /// |
2925 | /// where 'foo' and 'bar' are reduced across all OpenMP threads in |
2926 | /// all teams. In our OpenMP implementation on the NVPTX device an |
2927 | /// OpenMP team is mapped to a CUDA threadblock and OpenMP threads |
2928 | /// within a team are mapped to CUDA threads within a threadblock. |
2929 | /// Our goal is to efficiently aggregate values across all OpenMP |
2930 | /// threads such that: |
2931 | /// |
2932 | /// - the compiler and runtime are logically concise, and |
2933 | /// - the reduction is performed efficiently in a hierarchical |
2934 | /// manner as follows: within OpenMP threads in the same warp, |
2935 | /// across warps in a threadblock, and finally across teams on |
2936 | /// the NVPTX device. |
2937 | /// |
2938 | /// Introduction to Decoupling |
2939 | /// |
2940 | /// We would like to decouple the compiler and the runtime so that the |
2941 | /// latter is ignorant of the reduction variables (number, data types) |
2942 | /// and the reduction operators. This allows a simpler interface |
2943 | /// and implementation while still attaining good performance. |
2944 | /// |
2945 | /// Pseudocode for the aforementioned OpenMP program generated by the |
2946 | /// compiler is as follows: |
2947 | /// |
2948 | /// 1. Create private copies of reduction variables on each OpenMP |
2949 | /// thread: 'foo_private', 'bar_private' |
2950 | /// 2. Each OpenMP thread reduces the chunk of 'A' and 'B' assigned |
2951 | /// to it and writes the result in 'foo_private' and 'bar_private' |
2952 | /// respectively. |
2953 | /// 3. Call the OpenMP runtime on the GPU to reduce within a team |
2954 | /// and store the result on the team master: |
2955 | /// |
2956 | /// __kmpc_nvptx_parallel_reduce_nowait_v2(..., |
2957 | /// reduceData, shuffleReduceFn, interWarpCpyFn) |
2958 | /// |
2959 | /// where: |
2960 | /// struct ReduceData { |
2961 | /// double *foo; |
2962 | /// double *bar; |
2963 | /// } reduceData |
2964 | /// reduceData.foo = &foo_private |
2965 | /// reduceData.bar = &bar_private |
2966 | /// |
2967 | /// 'shuffleReduceFn' and 'interWarpCpyFn' are pointers to two |
2968 | /// auxiliary functions generated by the compiler that operate on |
2969 | /// variables of type 'ReduceData'. They aid the runtime perform |
2970 | /// algorithmic steps in a data agnostic manner. |
2971 | /// |
2972 | /// 'shuffleReduceFn' is a pointer to a function that reduces data |
2973 | /// of type 'ReduceData' across two OpenMP threads (lanes) in the |
2974 | /// same warp. It takes the following arguments as input: |
2975 | /// |
2976 | /// a. variable of type 'ReduceData' on the calling lane, |
2977 | /// b. its lane_id, |
2978 | /// c. an offset relative to the current lane_id to generate a |
2979 | /// remote_lane_id. The remote lane contains the second |
2980 | /// variable of type 'ReduceData' that is to be reduced. |
2981 | /// d. an algorithm version parameter determining which reduction |
2982 | /// algorithm to use. |
2983 | /// |
2984 | /// 'shuffleReduceFn' retrieves data from the remote lane using |
2985 | /// efficient GPU shuffle intrinsics and reduces, using the |
2986 | /// algorithm specified by the 4th parameter, the two operands |
2987 | /// element-wise. The result is written to the first operand. |
2988 | /// |
2989 | /// Different reduction algorithms are implemented in different |
2990 | /// runtime functions, all calling 'shuffleReduceFn' to perform |
2991 | /// the essential reduction step. Therefore, based on the 4th |
2992 | /// parameter, this function behaves slightly differently to |
2993 | /// cooperate with the runtime to ensure correctness under |
2994 | /// different circumstances. |
2995 | /// |
2996 | /// 'InterWarpCpyFn' is a pointer to a function that transfers |
2997 | /// reduced variables across warps. It tunnels, through CUDA |
2998 | /// shared memory, the thread-private data of type 'ReduceData' |
2999 | /// from lane 0 of each warp to a lane in the first warp. |
3000 | /// 4. Call the OpenMP runtime on the GPU to reduce across teams. |
3001 | /// The last team writes the global reduced value to memory. |
3002 | /// |
3003 | /// ret = __kmpc_nvptx_teams_reduce_nowait(..., |
3004 | /// reduceData, shuffleReduceFn, interWarpCpyFn, |
3005 | /// scratchpadCopyFn, loadAndReduceFn) |
3006 | /// |
3007 | /// 'scratchpadCopyFn' is a helper that stores reduced |
3008 | /// data from the team master to a scratchpad array in |
3009 | /// global memory. |
3010 | /// |
3011 | /// 'loadAndReduceFn' is a helper that loads data from |
3012 | /// the scratchpad array and reduces it with the input |
3013 | /// operand. |
3014 | /// |
3015 | /// These compiler generated functions hide address |
3016 | /// calculation and alignment information from the runtime. |
3017 | /// 5. if ret == 1: |
3018 | /// The team master of the last team stores the reduced |
3019 | /// result to the globals in memory. |
3020 | /// foo += reduceData.foo; bar *= reduceData.bar |
3021 | /// |
3022 | /// |
3023 | /// Warp Reduction Algorithms |
3024 | /// |
3025 | /// On the warp level, we have three algorithms implemented in the |
3026 | /// OpenMP runtime depending on the number of active lanes: |
3027 | /// |
3028 | /// Full Warp Reduction |
3029 | /// |
3030 | /// The reduce algorithm within a warp where all lanes are active |
3031 | /// is implemented in the runtime as follows: |
3032 | /// |
3033 | /// full_warp_reduce(void *reduce_data, |
3034 | /// kmp_ShuffleReductFctPtr ShuffleReduceFn) { |
3035 | /// for (int offset = WARPSIZE/2; offset > 0; offset /= 2) |
3036 | /// ShuffleReduceFn(reduce_data, 0, offset, 0); |
3037 | /// } |
3038 | /// |
3039 | /// The algorithm completes in log(2, WARPSIZE) steps. |
3040 | /// |
3041 | /// 'ShuffleReduceFn' is used here with lane_id set to 0 because it is |
3042 | /// not used therefore we save instructions by not retrieving lane_id |
3043 | /// from the corresponding special registers. The 4th parameter, which |
3044 | /// represents the version of the algorithm being used, is set to 0 to |
3045 | /// signify full warp reduction. |
3046 | /// |
3047 | /// In this version, 'ShuffleReduceFn' behaves, per element, as follows: |
3048 | /// |
3049 | /// #reduce_elem refers to an element in the local lane's data structure |
3050 | /// #remote_elem is retrieved from a remote lane |
3051 | /// remote_elem = shuffle_down(reduce_elem, offset, WARPSIZE); |
3052 | /// reduce_elem = reduce_elem REDUCE_OP remote_elem; |
3053 | /// |
3054 | /// Contiguous Partial Warp Reduction |
3055 | /// |
3056 | /// This reduce algorithm is used within a warp where only the first |
3057 | /// 'n' (n <= WARPSIZE) lanes are active. It is typically used when the |
3058 | /// number of OpenMP threads in a parallel region is not a multiple of |
3059 | /// WARPSIZE. The algorithm is implemented in the runtime as follows: |
3060 | /// |
3061 | /// void |
3062 | /// contiguous_partial_reduce(void *reduce_data, |
3063 | /// kmp_ShuffleReductFctPtr ShuffleReduceFn, |
3064 | /// int size, int lane_id) { |
3065 | /// int curr_size; |
3066 | /// int offset; |
3067 | /// curr_size = size; |
3068 | /// mask = curr_size/2; |
3069 | /// while (offset>0) { |
3070 | /// ShuffleReduceFn(reduce_data, lane_id, offset, 1); |
3071 | /// curr_size = (curr_size+1)/2; |
3072 | /// offset = curr_size/2; |
3073 | /// } |
3074 | /// } |
3075 | /// |
3076 | /// In this version, 'ShuffleReduceFn' behaves, per element, as follows: |
3077 | /// |
3078 | /// remote_elem = shuffle_down(reduce_elem, offset, WARPSIZE); |
3079 | /// if (lane_id < offset) |
3080 | /// reduce_elem = reduce_elem REDUCE_OP remote_elem |
3081 | /// else |
3082 | /// reduce_elem = remote_elem |
3083 | /// |
3084 | /// This algorithm assumes that the data to be reduced are located in a |
3085 | /// contiguous subset of lanes starting from the first. When there is |
3086 | /// an odd number of active lanes, the data in the last lane is not |
3087 | /// aggregated with any other lane's dat but is instead copied over. |
3088 | /// |
3089 | /// Dispersed Partial Warp Reduction |
3090 | /// |
3091 | /// This algorithm is used within a warp when any discontiguous subset of |
3092 | /// lanes are active. It is used to implement the reduction operation |
3093 | /// across lanes in an OpenMP simd region or in a nested parallel region. |
3094 | /// |
3095 | /// void |
3096 | /// dispersed_partial_reduce(void *reduce_data, |
3097 | /// kmp_ShuffleReductFctPtr ShuffleReduceFn) { |
3098 | /// int size, remote_id; |
3099 | /// int logical_lane_id = number_of_active_lanes_before_me() * 2; |
3100 | /// do { |
3101 | /// remote_id = next_active_lane_id_right_after_me(); |
3102 | /// # the above function returns 0 of no active lane |
3103 | /// # is present right after the current lane. |
3104 | /// size = number_of_active_lanes_in_this_warp(); |
3105 | /// logical_lane_id /= 2; |
3106 | /// ShuffleReduceFn(reduce_data, logical_lane_id, |
3107 | /// remote_id-1-threadIdx.x, 2); |
3108 | /// } while (logical_lane_id % 2 == 0 && size > 1); |
3109 | /// } |
3110 | /// |
3111 | /// There is no assumption made about the initial state of the reduction. |
3112 | /// Any number of lanes (>=1) could be active at any position. The reduction |
3113 | /// result is returned in the first active lane. |
3114 | /// |
3115 | /// In this version, 'ShuffleReduceFn' behaves, per element, as follows: |
3116 | /// |
3117 | /// remote_elem = shuffle_down(reduce_elem, offset, WARPSIZE); |
3118 | /// if (lane_id % 2 == 0 && offset > 0) |
3119 | /// reduce_elem = reduce_elem REDUCE_OP remote_elem |
3120 | /// else |
3121 | /// reduce_elem = remote_elem |
3122 | /// |
3123 | /// |
3124 | /// Intra-Team Reduction |
3125 | /// |
3126 | /// This function, as implemented in the runtime call |
3127 | /// '__kmpc_nvptx_parallel_reduce_nowait_v2', aggregates data across OpenMP |
3128 | /// threads in a team. It first reduces within a warp using the |
3129 | /// aforementioned algorithms. We then proceed to gather all such |
3130 | /// reduced values at the first warp. |
3131 | /// |
3132 | /// The runtime makes use of the function 'InterWarpCpyFn', which copies |
3133 | /// data from each of the "warp master" (zeroth lane of each warp, where |
3134 | /// warp-reduced data is held) to the zeroth warp. This step reduces (in |
3135 | /// a mathematical sense) the problem of reduction across warp masters in |
3136 | /// a block to the problem of warp reduction. |
3137 | /// |
3138 | /// |
3139 | /// Inter-Team Reduction |
3140 | /// |
3141 | /// Once a team has reduced its data to a single value, it is stored in |
3142 | /// a global scratchpad array. Since each team has a distinct slot, this |
3143 | /// can be done without locking. |
3144 | /// |
3145 | /// The last team to write to the scratchpad array proceeds to reduce the |
3146 | /// scratchpad array. One or more workers in the last team use the helper |
3147 | /// 'loadAndReduceDataFn' to load and reduce values from the array, i.e., |
3148 | /// the k'th worker reduces every k'th element. |
3149 | /// |
3150 | /// Finally, a call is made to '__kmpc_nvptx_parallel_reduce_nowait_v2' to |
3151 | /// reduce across workers and compute a globally reduced value. |
3152 | /// |
3153 | void CGOpenMPRuntimeGPU::emitReduction( |
3154 | CodeGenFunction &CGF, SourceLocation Loc, ArrayRef<const Expr *> Privates, |
3155 | ArrayRef<const Expr *> LHSExprs, ArrayRef<const Expr *> RHSExprs, |
3156 | ArrayRef<const Expr *> ReductionOps, ReductionOptionsTy Options) { |
3157 | if (!CGF.HaveInsertPoint()) |
3158 | return; |
3159 | |
3160 | bool ParallelReduction = isOpenMPParallelDirective(Options.ReductionKind); |
3161 | #ifndef NDEBUG1 |
3162 | bool TeamsReduction = isOpenMPTeamsDirective(Options.ReductionKind); |
3163 | #endif |
3164 | |
3165 | if (Options.SimpleReduction) { |
3166 | assert(!TeamsReduction && !ParallelReduction &&((void)0) |
3167 | "Invalid reduction selection in emitReduction.")((void)0); |
3168 | CGOpenMPRuntime::emitReduction(CGF, Loc, Privates, LHSExprs, RHSExprs, |
3169 | ReductionOps, Options); |
3170 | return; |
3171 | } |
3172 | |
3173 | assert((TeamsReduction || ParallelReduction) &&((void)0) |
3174 | "Invalid reduction selection in emitReduction.")((void)0); |
3175 | |
3176 | // Build res = __kmpc_reduce{_nowait}(<gtid>, <n>, sizeof(RedList), |
3177 | // RedList, shuffle_reduce_func, interwarp_copy_func); |
3178 | // or |
3179 | // Build res = __kmpc_reduce_teams_nowait_simple(<loc>, <gtid>, <lck>); |
3180 | llvm::Value *RTLoc = emitUpdateLocation(CGF, Loc); |
3181 | llvm::Value *ThreadId = getThreadID(CGF, Loc); |
3182 | |
3183 | llvm::Value *Res; |
3184 | ASTContext &C = CGM.getContext(); |
3185 | // 1. Build a list of reduction variables. |
3186 | // void *RedList[<n>] = {<ReductionVars>[0], ..., <ReductionVars>[<n>-1]}; |
3187 | auto Size = RHSExprs.size(); |
3188 | for (const Expr *E : Privates) { |
3189 | if (E->getType()->isVariablyModifiedType()) |
3190 | // Reserve place for array size. |
3191 | ++Size; |
3192 | } |
3193 | llvm::APInt ArraySize(/*unsigned int numBits=*/32, Size); |
3194 | QualType ReductionArrayTy = |
3195 | C.getConstantArrayType(C.VoidPtrTy, ArraySize, nullptr, ArrayType::Normal, |
3196 | /*IndexTypeQuals=*/0); |
3197 | Address ReductionList = |
3198 | CGF.CreateMemTemp(ReductionArrayTy, ".omp.reduction.red_list"); |
3199 | auto IPriv = Privates.begin(); |
3200 | unsigned Idx = 0; |
3201 | for (unsigned I = 0, E = RHSExprs.size(); I < E; ++I, ++IPriv, ++Idx) { |
3202 | Address Elem = CGF.Builder.CreateConstArrayGEP(ReductionList, Idx); |
3203 | CGF.Builder.CreateStore( |
3204 | CGF.Builder.CreatePointerBitCastOrAddrSpaceCast( |
3205 | CGF.EmitLValue(RHSExprs[I]).getPointer(CGF), CGF.VoidPtrTy), |
3206 | Elem); |
3207 | if ((*IPriv)->getType()->isVariablyModifiedType()) { |
3208 | // Store array size. |
3209 | ++Idx; |
3210 | Elem = CGF.Builder.CreateConstArrayGEP(ReductionList, Idx); |
3211 | llvm::Value *Size = CGF.Builder.CreateIntCast( |
3212 | CGF.getVLASize( |
3213 | CGF.getContext().getAsVariableArrayType((*IPriv)->getType())) |
3214 | .NumElts, |
3215 | CGF.SizeTy, /*isSigned=*/false); |
3216 | CGF.Builder.CreateStore(CGF.Builder.CreateIntToPtr(Size, CGF.VoidPtrTy), |
3217 | Elem); |
3218 | } |
3219 | } |
3220 | |
3221 | llvm::Value *RL = CGF.Builder.CreatePointerBitCastOrAddrSpaceCast( |
3222 | ReductionList.getPointer(), CGF.VoidPtrTy); |
3223 | llvm::Function *ReductionFn = emitReductionFunction( |
3224 | Loc, CGF.ConvertTypeForMem(ReductionArrayTy)->getPointerTo(), Privates, |
3225 | LHSExprs, RHSExprs, ReductionOps); |
3226 | llvm::Value *ReductionArrayTySize = CGF.getTypeSize(ReductionArrayTy); |
3227 | llvm::Function *ShuffleAndReduceFn = emitShuffleAndReduceFunction( |
3228 | CGM, Privates, ReductionArrayTy, ReductionFn, Loc); |
3229 | llvm::Value *InterWarpCopyFn = |
3230 | emitInterWarpCopyFunction(CGM, Privates, ReductionArrayTy, Loc); |
3231 | |
3232 | if (ParallelReduction) { |
3233 | llvm::Value *Args[] = {RTLoc, |
3234 | ThreadId, |
3235 | CGF.Builder.getInt32(RHSExprs.size()), |
3236 | ReductionArrayTySize, |
3237 | RL, |
3238 | ShuffleAndReduceFn, |
3239 | InterWarpCopyFn}; |
3240 | |
3241 | Res = CGF.EmitRuntimeCall( |
3242 | OMPBuilder.getOrCreateRuntimeFunction( |
3243 | CGM.getModule(), OMPRTL___kmpc_nvptx_parallel_reduce_nowait_v2), |
3244 | Args); |
3245 | } else { |
3246 | assert(TeamsReduction && "expected teams reduction.")((void)0); |
3247 | llvm::SmallDenseMap<const ValueDecl *, const FieldDecl *> VarFieldMap; |
3248 | llvm::SmallVector<const ValueDecl *, 4> PrivatesReductions(Privates.size()); |
3249 | int Cnt = 0; |
3250 | for (const Expr *DRE : Privates) { |
3251 | PrivatesReductions[Cnt] = cast<DeclRefExpr>(DRE)->getDecl(); |
3252 | ++Cnt; |
3253 | } |
3254 | const RecordDecl *TeamReductionRec = ::buildRecordForGlobalizedVars( |
3255 | CGM.getContext(), PrivatesReductions, llvm::None, VarFieldMap, |
3256 | C.getLangOpts().OpenMPCUDAReductionBufNum); |
3257 | TeamsReductions.push_back(TeamReductionRec); |
3258 | if (!KernelTeamsReductionPtr) { |
3259 | KernelTeamsReductionPtr = new llvm::GlobalVariable( |
3260 | CGM.getModule(), CGM.VoidPtrTy, /*isConstant=*/true, |
3261 | llvm::GlobalValue::InternalLinkage, nullptr, |
3262 | "_openmp_teams_reductions_buffer_$_$ptr"); |
3263 | } |
3264 | llvm::Value *GlobalBufferPtr = CGF.EmitLoadOfScalar( |
3265 | Address(KernelTeamsReductionPtr, CGM.getPointerAlign()), |
3266 | /*Volatile=*/false, C.getPointerType(C.VoidPtrTy), Loc); |
3267 | llvm::Value *GlobalToBufferCpyFn = ::emitListToGlobalCopyFunction( |
3268 | CGM, Privates, ReductionArrayTy, Loc, TeamReductionRec, VarFieldMap); |
3269 | llvm::Value *GlobalToBufferRedFn = ::emitListToGlobalReduceFunction( |
3270 | CGM, Privates, ReductionArrayTy, Loc, TeamReductionRec, VarFieldMap, |
3271 | ReductionFn); |
3272 | llvm::Value *BufferToGlobalCpyFn = ::emitGlobalToListCopyFunction( |
3273 | CGM, Privates, ReductionArrayTy, Loc, TeamReductionRec, VarFieldMap); |
3274 | llvm::Value *BufferToGlobalRedFn = ::emitGlobalToListReduceFunction( |
3275 | CGM, Privates, ReductionArrayTy, Loc, TeamReductionRec, VarFieldMap, |
3276 | ReductionFn); |
3277 | |
3278 | llvm::Value *Args[] = { |
3279 | RTLoc, |
3280 | ThreadId, |
3281 | GlobalBufferPtr, |
3282 | CGF.Builder.getInt32(C.getLangOpts().OpenMPCUDAReductionBufNum), |
3283 | RL, |
3284 | ShuffleAndReduceFn, |
3285 | InterWarpCopyFn, |
3286 | GlobalToBufferCpyFn, |
3287 | GlobalToBufferRedFn, |
3288 | BufferToGlobalCpyFn, |
3289 | BufferToGlobalRedFn}; |
3290 | |
3291 | Res = CGF.EmitRuntimeCall( |
3292 | OMPBuilder.getOrCreateRuntimeFunction( |
3293 | CGM.getModule(), OMPRTL___kmpc_nvptx_teams_reduce_nowait_v2), |
3294 | Args); |
3295 | } |
3296 | |
3297 | // 5. Build if (res == 1) |
3298 | llvm::BasicBlock *ExitBB = CGF.createBasicBlock(".omp.reduction.done"); |
3299 | llvm::BasicBlock *ThenBB = CGF.createBasicBlock(".omp.reduction.then"); |
3300 | llvm::Value *Cond = CGF.Builder.CreateICmpEQ( |
3301 | Res, llvm::ConstantInt::get(CGM.Int32Ty, /*V=*/1)); |
3302 | CGF.Builder.CreateCondBr(Cond, ThenBB, ExitBB); |
3303 | |
3304 | // 6. Build then branch: where we have reduced values in the master |
3305 | // thread in each team. |
3306 | // __kmpc_end_reduce{_nowait}(<gtid>); |
3307 | // break; |
3308 | CGF.EmitBlock(ThenBB); |
3309 | |
3310 | // Add emission of __kmpc_end_reduce{_nowait}(<gtid>); |
3311 | auto &&CodeGen = [Privates, LHSExprs, RHSExprs, ReductionOps, |
3312 | this](CodeGenFunction &CGF, PrePostActionTy &Action) { |
3313 | auto IPriv = Privates.begin(); |
3314 | auto ILHS = LHSExprs.begin(); |
3315 | auto IRHS = RHSExprs.begin(); |
3316 | for (const Expr *E : ReductionOps) { |
3317 | emitSingleReductionCombiner(CGF, E, *IPriv, cast<DeclRefExpr>(*ILHS), |
3318 | cast<DeclRefExpr>(*IRHS)); |
3319 | ++IPriv; |
3320 | ++ILHS; |
3321 | ++IRHS; |
3322 | } |
3323 | }; |
3324 | llvm::Value *EndArgs[] = {ThreadId}; |
3325 | RegionCodeGenTy RCG(CodeGen); |
3326 | NVPTXActionTy Action( |
3327 | nullptr, llvm::None, |
3328 | OMPBuilder.getOrCreateRuntimeFunction( |
3329 | CGM.getModule(), OMPRTL___kmpc_nvptx_end_reduce_nowait), |
3330 | EndArgs); |
3331 | RCG.setAction(Action); |
3332 | RCG(CGF); |
3333 | // There is no need to emit line number for unconditional branch. |
3334 | (void)ApplyDebugLocation::CreateEmpty(CGF); |
3335 | CGF.EmitBlock(ExitBB, /*IsFinished=*/true); |
3336 | } |
3337 | |
3338 | const VarDecl * |
3339 | CGOpenMPRuntimeGPU::translateParameter(const FieldDecl *FD, |
3340 | const VarDecl *NativeParam) const { |
3341 | if (!NativeParam->getType()->isReferenceType()) |
3342 | return NativeParam; |
3343 | QualType ArgType = NativeParam->getType(); |
3344 | QualifierCollector QC; |
3345 | const Type *NonQualTy = QC.strip(ArgType); |
3346 | QualType PointeeTy = cast<ReferenceType>(NonQualTy)->getPointeeType(); |
3347 | if (const auto *Attr = FD->getAttr<OMPCaptureKindAttr>()) { |
3348 | if (Attr->getCaptureKind() == OMPC_map) { |
3349 | PointeeTy = CGM.getContext().getAddrSpaceQualType(PointeeTy, |
3350 | LangAS::opencl_global); |
3351 | } |
3352 | } |
3353 | ArgType = CGM.getContext().getPointerType(PointeeTy); |
3354 | QC.addRestrict(); |
3355 | enum { NVPTX_local_addr = 5 }; |
3356 | QC.addAddressSpace(getLangASFromTargetAS(NVPTX_local_addr)); |
3357 | ArgType = QC.apply(CGM.getContext(), ArgType); |
3358 | if (isa<ImplicitParamDecl>(NativeParam)) |
3359 | return ImplicitParamDecl::Create( |
3360 | CGM.getContext(), /*DC=*/nullptr, NativeParam->getLocation(), |
3361 | NativeParam->getIdentifier(), ArgType, ImplicitParamDecl::Other); |
3362 | return ParmVarDecl::Create( |
3363 | CGM.getContext(), |
3364 | const_cast<DeclContext *>(NativeParam->getDeclContext()), |
3365 | NativeParam->getBeginLoc(), NativeParam->getLocation(), |
3366 | NativeParam->getIdentifier(), ArgType, |
3367 | /*TInfo=*/nullptr, SC_None, /*DefArg=*/nullptr); |
3368 | } |
3369 | |
3370 | Address |
3371 | CGOpenMPRuntimeGPU::getParameterAddress(CodeGenFunction &CGF, |
3372 | const VarDecl *NativeParam, |
3373 | const VarDecl *TargetParam) const { |
3374 | assert(NativeParam != TargetParam &&((void)0) |
3375 | NativeParam->getType()->isReferenceType() &&((void)0) |
3376 | "Native arg must not be the same as target arg.")((void)0); |
3377 | Address LocalAddr = CGF.GetAddrOfLocalVar(TargetParam); |
3378 | QualType NativeParamType = NativeParam->getType(); |
3379 | QualifierCollector QC; |
3380 | const Type *NonQualTy = QC.strip(NativeParamType); |
3381 | QualType NativePointeeTy = cast<ReferenceType>(NonQualTy)->getPointeeType(); |
3382 | unsigned NativePointeeAddrSpace = |
3383 | CGF.getContext().getTargetAddressSpace(NativePointeeTy); |
3384 | QualType TargetTy = TargetParam->getType(); |
3385 | llvm::Value *TargetAddr = CGF.EmitLoadOfScalar( |
3386 | LocalAddr, /*Volatile=*/false, TargetTy, SourceLocation()); |
3387 | // First cast to generic. |
3388 | TargetAddr = CGF.Builder.CreatePointerBitCastOrAddrSpaceCast( |
3389 | TargetAddr, TargetAddr->getType()->getPointerElementType()->getPointerTo( |
3390 | /*AddrSpace=*/0)); |
3391 | // Cast from generic to native address space. |
3392 | TargetAddr = CGF.Builder.CreatePointerBitCastOrAddrSpaceCast( |
3393 | TargetAddr, TargetAddr->getType()->getPointerElementType()->getPointerTo( |
3394 | NativePointeeAddrSpace)); |
3395 | Address NativeParamAddr = CGF.CreateMemTemp(NativeParamType); |
3396 | CGF.EmitStoreOfScalar(TargetAddr, NativeParamAddr, /*Volatile=*/false, |
3397 | NativeParamType); |
3398 | return NativeParamAddr; |
3399 | } |
3400 | |
3401 | void CGOpenMPRuntimeGPU::emitOutlinedFunctionCall( |
3402 | CodeGenFunction &CGF, SourceLocation Loc, llvm::FunctionCallee OutlinedFn, |
3403 | ArrayRef<llvm::Value *> Args) const { |
3404 | SmallVector<llvm::Value *, 4> TargetArgs; |
3405 | TargetArgs.reserve(Args.size()); |
3406 | auto *FnType = OutlinedFn.getFunctionType(); |
3407 | for (unsigned I = 0, E = Args.size(); I < E; ++I) { |
3408 | if (FnType->isVarArg() && FnType->getNumParams() <= I) { |
3409 | TargetArgs.append(std::next(Args.begin(), I), Args.end()); |
3410 | break; |
3411 | } |
3412 | llvm::Type *TargetType = FnType->getParamType(I); |
3413 | llvm::Value *NativeArg = Args[I]; |
3414 | if (!TargetType->isPointerTy()) { |
3415 | TargetArgs.emplace_back(NativeArg); |
3416 | continue; |
3417 | } |
3418 | llvm::Value *TargetArg = CGF.Builder.CreatePointerBitCastOrAddrSpaceCast( |
3419 | NativeArg, |
3420 | NativeArg->getType()->getPointerElementType()->getPointerTo()); |
3421 | TargetArgs.emplace_back( |
3422 | CGF.Builder.CreatePointerBitCastOrAddrSpaceCast(TargetArg, TargetType)); |
3423 | } |
3424 | CGOpenMPRuntime::emitOutlinedFunctionCall(CGF, Loc, OutlinedFn, TargetArgs); |
3425 | } |
3426 | |
3427 | /// Emit function which wraps the outline parallel region |
3428 | /// and controls the arguments which are passed to this function. |
3429 | /// The wrapper ensures that the outlined function is called |
3430 | /// with the correct arguments when data is shared. |
3431 | llvm::Function *CGOpenMPRuntimeGPU::createParallelDataSharingWrapper( |
3432 | llvm::Function *OutlinedParallelFn, const OMPExecutableDirective &D) { |
3433 | ASTContext &Ctx = CGM.getContext(); |
3434 | const auto &CS = *D.getCapturedStmt(OMPD_parallel); |
3435 | |
3436 | // Create a function that takes as argument the source thread. |
3437 | FunctionArgList WrapperArgs; |
3438 | QualType Int16QTy = |
3439 | Ctx.getIntTypeForBitwidth(/*DestWidth=*/16, /*Signed=*/false); |
3440 | QualType Int32QTy = |
3441 | Ctx.getIntTypeForBitwidth(/*DestWidth=*/32, /*Signed=*/false); |
3442 | ImplicitParamDecl ParallelLevelArg(Ctx, /*DC=*/nullptr, D.getBeginLoc(), |
3443 | /*Id=*/nullptr, Int16QTy, |
3444 | ImplicitParamDecl::Other); |
3445 | ImplicitParamDecl WrapperArg(Ctx, /*DC=*/nullptr, D.getBeginLoc(), |
3446 | /*Id=*/nullptr, Int32QTy, |
3447 | ImplicitParamDecl::Other); |
3448 | WrapperArgs.emplace_back(&ParallelLevelArg); |
3449 | WrapperArgs.emplace_back(&WrapperArg); |
3450 | |
3451 | const CGFunctionInfo &CGFI = |
3452 | CGM.getTypes().arrangeBuiltinFunctionDeclaration(Ctx.VoidTy, WrapperArgs); |
3453 | |
3454 | auto *Fn = llvm::Function::Create( |
3455 | CGM.getTypes().GetFunctionType(CGFI), llvm::GlobalValue::InternalLinkage, |
3456 | Twine(OutlinedParallelFn->getName(), "_wrapper"), &CGM.getModule()); |
3457 | |
3458 | // Ensure we do not inline the function. This is trivially true for the ones |
3459 | // passed to __kmpc_fork_call but the ones calles in serialized regions |
3460 | // could be inlined. This is not a perfect but it is closer to the invariant |
3461 | // we want, namely, every data environment starts with a new function. |
3462 | // TODO: We should pass the if condition to the runtime function and do the |
3463 | // handling there. Much cleaner code. |
3464 | Fn->addFnAttr(llvm::Attribute::NoInline); |
3465 | |
3466 | CGM.SetInternalFunctionAttributes(GlobalDecl(), Fn, CGFI); |
3467 | Fn->setLinkage(llvm::GlobalValue::InternalLinkage); |
3468 | Fn->setDoesNotRecurse(); |
3469 | |
3470 | CodeGenFunction CGF(CGM, /*suppressNewContext=*/true); |
3471 | CGF.StartFunction(GlobalDecl(), Ctx.VoidTy, Fn, CGFI, WrapperArgs, |
3472 | D.getBeginLoc(), D.getBeginLoc()); |
3473 | |
3474 | const auto *RD = CS.getCapturedRecordDecl(); |
3475 | auto CurField = RD->field_begin(); |
3476 | |
3477 | Address ZeroAddr = CGF.CreateDefaultAlignTempAlloca(CGF.Int32Ty, |
3478 | /*Name=*/".zero.addr"); |
3479 | CGF.InitTempAlloca(ZeroAddr, CGF.Builder.getInt32(/*C*/ 0)); |
3480 | // Get the array of arguments. |
3481 | SmallVector<llvm::Value *, 8> Args; |
3482 | |
3483 | Args.emplace_back(CGF.GetAddrOfLocalVar(&WrapperArg).getPointer()); |
3484 | Args.emplace_back(ZeroAddr.getPointer()); |
3485 | |
3486 | CGBuilderTy &Bld = CGF.Builder; |
3487 | auto CI = CS.capture_begin(); |
3488 | |
3489 | // Use global memory for data sharing. |
3490 | // Handle passing of global args to workers. |
3491 | Address GlobalArgs = |
3492 | CGF.CreateDefaultAlignTempAlloca(CGF.VoidPtrPtrTy, "global_args"); |
3493 | llvm::Value *GlobalArgsPtr = GlobalArgs.getPointer(); |
3494 | llvm::Value *DataSharingArgs[] = {GlobalArgsPtr}; |
3495 | CGF.EmitRuntimeCall(OMPBuilder.getOrCreateRuntimeFunction( |
3496 | CGM.getModule(), OMPRTL___kmpc_get_shared_variables), |
3497 | DataSharingArgs); |
3498 | |
3499 | // Retrieve the shared variables from the list of references returned |
3500 | // by the runtime. Pass the variables to the outlined function. |
3501 | Address SharedArgListAddress = Address::invalid(); |
3502 | if (CS.capture_size() > 0 || |
3503 | isOpenMPLoopBoundSharingDirective(D.getDirectiveKind())) { |
3504 | SharedArgListAddress = CGF.EmitLoadOfPointer( |
3505 | GlobalArgs, CGF.getContext() |
3506 | .getPointerType(CGF.getContext().getPointerType( |
3507 | CGF.getContext().VoidPtrTy)) |
3508 | .castAs<PointerType>()); |
3509 | } |
3510 | unsigned Idx = 0; |
3511 | if (isOpenMPLoopBoundSharingDirective(D.getDirectiveKind())) { |
3512 | Address Src = Bld.CreateConstInBoundsGEP(SharedArgListAddress, Idx); |
3513 | Address TypedAddress = Bld.CreatePointerBitCastOrAddrSpaceCast( |
3514 | Src, CGF.SizeTy->getPointerTo()); |
3515 | llvm::Value *LB = CGF.EmitLoadOfScalar( |
3516 | TypedAddress, |
3517 | /*Volatile=*/false, |
3518 | CGF.getContext().getPointerType(CGF.getContext().getSizeType()), |
3519 | cast<OMPLoopDirective>(D).getLowerBoundVariable()->getExprLoc()); |
3520 | Args.emplace_back(LB); |
3521 | ++Idx; |
3522 | Src = Bld.CreateConstInBoundsGEP(SharedArgListAddress, Idx); |
3523 | TypedAddress = Bld.CreatePointerBitCastOrAddrSpaceCast( |
3524 | Src, CGF.SizeTy->getPointerTo()); |
3525 | llvm::Value *UB = CGF.EmitLoadOfScalar( |
3526 | TypedAddress, |
3527 | /*Volatile=*/false, |
3528 | CGF.getContext().getPointerType(CGF.getContext().getSizeType()), |
3529 | cast<OMPLoopDirective>(D).getUpperBoundVariable()->getExprLoc()); |
3530 | Args.emplace_back(UB); |
3531 | ++Idx; |
3532 | } |
3533 | if (CS.capture_size() > 0) { |
3534 | ASTContext &CGFContext = CGF.getContext(); |
3535 | for (unsigned I = 0, E = CS.capture_size(); I < E; ++I, ++CI, ++CurField) { |
3536 | QualType ElemTy = CurField->getType(); |
3537 | Address Src = Bld.CreateConstInBoundsGEP(SharedArgListAddress, I + Idx); |
3538 | Address TypedAddress = Bld.CreatePointerBitCastOrAddrSpaceCast( |
3539 | Src, CGF.ConvertTypeForMem(CGFContext.getPointerType(ElemTy))); |
3540 | llvm::Value *Arg = CGF.EmitLoadOfScalar(TypedAddress, |
3541 | /*Volatile=*/false, |
3542 | CGFContext.getPointerType(ElemTy), |
3543 | CI->getLocation()); |
3544 | if (CI->capturesVariableByCopy() && |
3545 | !CI->getCapturedVar()->getType()->isAnyPointerType()) { |
3546 | Arg = castValueToType(CGF, Arg, ElemTy, CGFContext.getUIntPtrType(), |
3547 | CI->getLocation()); |
3548 | } |
3549 | Args.emplace_back(Arg); |
3550 | } |
3551 | } |
3552 | |
3553 | emitOutlinedFunctionCall(CGF, D.getBeginLoc(), OutlinedParallelFn, Args); |
3554 | CGF.FinishFunction(); |
3555 | return Fn; |
3556 | } |
3557 | |
3558 | void CGOpenMPRuntimeGPU::emitFunctionProlog(CodeGenFunction &CGF, |
3559 | const Decl *D) { |
3560 | if (getDataSharingMode(CGM) != CGOpenMPRuntimeGPU::Generic) |
3561 | return; |
3562 | |
3563 | assert(D && "Expected function or captured|block decl.")((void)0); |
3564 | assert(FunctionGlobalizedDecls.count(CGF.CurFn) == 0 &&((void)0) |
3565 | "Function is registered already.")((void)0); |
3566 | assert((!TeamAndReductions.first || TeamAndReductions.first == D) &&((void)0) |
3567 | "Team is set but not processed.")((void)0); |
3568 | const Stmt *Body = nullptr; |
3569 | bool NeedToDelayGlobalization = false; |
3570 | if (const auto *FD = dyn_cast<FunctionDecl>(D)) { |
3571 | Body = FD->getBody(); |
3572 | } else if (const auto *BD = dyn_cast<BlockDecl>(D)) { |
3573 | Body = BD->getBody(); |
3574 | } else if (const auto *CD = dyn_cast<CapturedDecl>(D)) { |
3575 | Body = CD->getBody(); |
3576 | NeedToDelayGlobalization = CGF.CapturedStmtInfo->getKind() == CR_OpenMP; |
3577 | if (NeedToDelayGlobalization && |
3578 | getExecutionMode() == CGOpenMPRuntimeGPU::EM_SPMD) |
3579 | return; |
3580 | } |
3581 | if (!Body) |
3582 | return; |
3583 | CheckVarsEscapingDeclContext VarChecker(CGF, TeamAndReductions.second); |
3584 | VarChecker.Visit(Body); |
3585 | const RecordDecl *GlobalizedVarsRecord = |
3586 | VarChecker.getGlobalizedRecord(IsInTTDRegion); |
3587 | TeamAndReductions.first = nullptr; |
3588 | TeamAndReductions.second.clear(); |
3589 | ArrayRef<const ValueDecl *> EscapedVariableLengthDecls = |
3590 | VarChecker.getEscapedVariableLengthDecls(); |
3591 | if (!GlobalizedVarsRecord && EscapedVariableLengthDecls.empty()) |
3592 | return; |
3593 | auto I = FunctionGlobalizedDecls.try_emplace(CGF.CurFn).first; |
3594 | I->getSecond().MappedParams = |
3595 | std::make_unique<CodeGenFunction::OMPMapVars>(); |
3596 | I->getSecond().EscapedParameters.insert( |
3597 | VarChecker.getEscapedParameters().begin(), |
3598 | VarChecker.getEscapedParameters().end()); |
3599 | I->getSecond().EscapedVariableLengthDecls.append( |
3600 | EscapedVariableLengthDecls.begin(), EscapedVariableLengthDecls.end()); |
3601 | DeclToAddrMapTy &Data = I->getSecond().LocalVarData; |
3602 | for (const ValueDecl *VD : VarChecker.getEscapedDecls()) { |
3603 | assert(VD->isCanonicalDecl() && "Expected canonical declaration")((void)0); |
3604 | Data.insert(std::make_pair(VD, MappedVarData())); |
3605 | } |
3606 | if (!IsInTTDRegion && !NeedToDelayGlobalization && !IsInParallelRegion) { |
3607 | CheckVarsEscapingDeclContext VarChecker(CGF, llvm::None); |
3608 | VarChecker.Visit(Body); |
3609 | I->getSecond().SecondaryLocalVarData.emplace(); |
3610 | DeclToAddrMapTy &Data = I->getSecond().SecondaryLocalVarData.getValue(); |
3611 | for (const ValueDecl *VD : VarChecker.getEscapedDecls()) { |
3612 | assert(VD->isCanonicalDecl() && "Expected canonical declaration")((void)0); |
3613 | Data.insert(std::make_pair(VD, MappedVarData())); |
3614 | } |
3615 | } |
3616 | if (!NeedToDelayGlobalization) { |
3617 | emitGenericVarsProlog(CGF, D->getBeginLoc(), /*WithSPMDCheck=*/true); |
3618 | struct GlobalizationScope final : EHScopeStack::Cleanup { |
3619 | GlobalizationScope() = default; |
3620 | |
3621 | void Emit(CodeGenFunction &CGF, Flags flags) override { |
3622 | static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime()) |
3623 | .emitGenericVarsEpilog(CGF, /*WithSPMDCheck=*/true); |
3624 | } |
3625 | }; |
3626 | CGF.EHStack.pushCleanup<GlobalizationScope>(NormalAndEHCleanup); |
3627 | } |
3628 | } |
3629 | |
3630 | Address CGOpenMPRuntimeGPU::getAddressOfLocalVariable(CodeGenFunction &CGF, |
3631 | const VarDecl *VD) { |
3632 | if (VD && VD->hasAttr<OMPAllocateDeclAttr>()) { |
3633 | const auto *A = VD->getAttr<OMPAllocateDeclAttr>(); |
3634 | auto AS = LangAS::Default; |
3635 | switch (A->getAllocatorType()) { |
3636 | // Use the default allocator here as by default local vars are |
3637 | // threadlocal. |
3638 | case OMPAllocateDeclAttr::OMPNullMemAlloc: |
3639 | case OMPAllocateDeclAttr::OMPDefaultMemAlloc: |
3640 | case OMPAllocateDeclAttr::OMPThreadMemAlloc: |
3641 | case OMPAllocateDeclAttr::OMPHighBWMemAlloc: |
3642 | case OMPAllocateDeclAttr::OMPLowLatMemAlloc: |
3643 | // Follow the user decision - use default allocation. |
3644 | return Address::invalid(); |
3645 | case OMPAllocateDeclAttr::OMPUserDefinedMemAlloc: |
3646 | // TODO: implement aupport for user-defined allocators. |
3647 | return Address::invalid(); |
3648 | case OMPAllocateDeclAttr::OMPConstMemAlloc: |
3649 | AS = LangAS::cuda_constant; |
3650 | break; |
3651 | case OMPAllocateDeclAttr::OMPPTeamMemAlloc: |
3652 | AS = LangAS::cuda_shared; |
3653 | break; |
3654 | case OMPAllocateDeclAttr::OMPLargeCapMemAlloc: |
3655 | case OMPAllocateDeclAttr::OMPCGroupMemAlloc: |
3656 | break; |
3657 | } |
3658 | llvm::Type *VarTy = CGF.ConvertTypeForMem(VD->getType()); |
3659 | auto *GV = new llvm::GlobalVariable( |
3660 | CGM.getModule(), VarTy, /*isConstant=*/false, |
3661 | llvm::GlobalValue::InternalLinkage, llvm::Constant::getNullValue(VarTy), |
3662 | VD->getName(), |
3663 | /*InsertBefore=*/nullptr, llvm::GlobalValue::NotThreadLocal, |
3664 | CGM.getContext().getTargetAddressSpace(AS)); |
3665 | CharUnits Align = CGM.getContext().getDeclAlign(VD); |
3666 | GV->setAlignment(Align.getAsAlign()); |
3667 | return Address( |
3668 | CGF.Builder.CreatePointerBitCastOrAddrSpaceCast( |
3669 | GV, VarTy->getPointerTo(CGM.getContext().getTargetAddressSpace( |
3670 | VD->getType().getAddressSpace()))), |
3671 | Align); |
3672 | } |
3673 | |
3674 | if (getDataSharingMode(CGM) != CGOpenMPRuntimeGPU::Generic) |
3675 | return Address::invalid(); |
3676 | |
3677 | VD = VD->getCanonicalDecl(); |
3678 | auto I = FunctionGlobalizedDecls.find(CGF.CurFn); |
3679 | if (I == FunctionGlobalizedDecls.end()) |
3680 | return Address::invalid(); |
3681 | auto VDI = I->getSecond().LocalVarData.find(VD); |
3682 | if (VDI != I->getSecond().LocalVarData.end()) |
3683 | return VDI->second.PrivateAddr; |
3684 | if (VD->hasAttrs()) { |
3685 | for (specific_attr_iterator<OMPReferencedVarAttr> IT(VD->attr_begin()), |
3686 | E(VD->attr_end()); |
3687 | IT != E; ++IT) { |
3688 | auto VDI = I->getSecond().LocalVarData.find( |
3689 | cast<VarDecl>(cast<DeclRefExpr>(IT->getRef())->getDecl()) |
3690 | ->getCanonicalDecl()); |
3691 | if (VDI != I->getSecond().LocalVarData.end()) |
3692 | return VDI->second.PrivateAddr; |
3693 | } |
3694 | } |
3695 | |
3696 | return Address::invalid(); |
3697 | } |
3698 | |
3699 | void CGOpenMPRuntimeGPU::functionFinished(CodeGenFunction &CGF) { |
3700 | FunctionGlobalizedDecls.erase(CGF.CurFn); |
3701 | CGOpenMPRuntime::functionFinished(CGF); |
3702 | } |
3703 | |
3704 | void CGOpenMPRuntimeGPU::getDefaultDistScheduleAndChunk( |
3705 | CodeGenFunction &CGF, const OMPLoopDirective &S, |
3706 | OpenMPDistScheduleClauseKind &ScheduleKind, |
3707 | llvm::Value *&Chunk) const { |
3708 | auto &RT = static_cast<CGOpenMPRuntimeGPU &>(CGF.CGM.getOpenMPRuntime()); |
3709 | if (getExecutionMode() == CGOpenMPRuntimeGPU::EM_SPMD) { |
3710 | ScheduleKind = OMPC_DIST_SCHEDULE_static; |
3711 | Chunk = CGF.EmitScalarConversion( |
3712 | RT.getGPUNumThreads(CGF), |
3713 | CGF.getContext().getIntTypeForBitwidth(32, /*Signed=*/0), |
3714 | S.getIterationVariable()->getType(), S.getBeginLoc()); |
3715 | return; |
3716 | } |
3717 | CGOpenMPRuntime::getDefaultDistScheduleAndChunk( |
3718 | CGF, S, ScheduleKind, Chunk); |
3719 | } |
3720 | |
3721 | void CGOpenMPRuntimeGPU::getDefaultScheduleAndChunk( |
3722 | CodeGenFunction &CGF, const OMPLoopDirective &S, |
3723 | OpenMPScheduleClauseKind &ScheduleKind, |
3724 | const Expr *&ChunkExpr) const { |
3725 | ScheduleKind = OMPC_SCHEDULE_static; |
3726 | // Chunk size is 1 in this case. |
3727 | llvm::APInt ChunkSize(32, 1); |
3728 | ChunkExpr = IntegerLiteral::Create(CGF.getContext(), ChunkSize, |
3729 | CGF.getContext().getIntTypeForBitwidth(32, /*Signed=*/0), |
3730 | SourceLocation()); |
3731 | } |
3732 | |
3733 | void CGOpenMPRuntimeGPU::adjustTargetSpecificDataForLambdas( |
3734 | CodeGenFunction &CGF, const OMPExecutableDirective &D) const { |
3735 | assert(isOpenMPTargetExecutionDirective(D.getDirectiveKind()) &&((void)0) |
3736 | " Expected target-based directive.")((void)0); |
3737 | const CapturedStmt *CS = D.getCapturedStmt(OMPD_target); |
3738 | for (const CapturedStmt::Capture &C : CS->captures()) { |
3739 | // Capture variables captured by reference in lambdas for target-based |
3740 | // directives. |
3741 | if (!C.capturesVariable()) |
3742 | continue; |
3743 | const VarDecl *VD = C.getCapturedVar(); |
3744 | const auto *RD = VD->getType() |
3745 | .getCanonicalType() |
3746 | .getNonReferenceType() |
3747 | ->getAsCXXRecordDecl(); |
3748 | if (!RD || !RD->isLambda()) |
3749 | continue; |
3750 | Address VDAddr = CGF.GetAddrOfLocalVar(VD); |
3751 | LValue VDLVal; |
3752 | if (VD->getType().getCanonicalType()->isReferenceType()) |
3753 | VDLVal = CGF.EmitLoadOfReferenceLValue(VDAddr, VD->getType()); |
3754 | else |
3755 | VDLVal = CGF.MakeAddrLValue( |
3756 | VDAddr, VD->getType().getCanonicalType().getNonReferenceType()); |
3757 | llvm::DenseMap<const VarDecl *, FieldDecl *> Captures; |
3758 | FieldDecl *ThisCapture = nullptr; |
3759 | RD->getCaptureFields(Captures, ThisCapture); |
3760 | if (ThisCapture && CGF.CapturedStmtInfo->isCXXThisExprCaptured()) { |
3761 | LValue ThisLVal = |
3762 | CGF.EmitLValueForFieldInitialization(VDLVal, ThisCapture); |
3763 | llvm::Value *CXXThis = CGF.LoadCXXThis(); |
3764 | CGF.EmitStoreOfScalar(CXXThis, ThisLVal); |
3765 | } |
3766 | for (const LambdaCapture &LC : RD->captures()) { |
3767 | if (LC.getCaptureKind() != LCK_ByRef) |
3768 | continue; |
3769 | const VarDecl *VD = LC.getCapturedVar(); |
3770 | if (!CS->capturesVariable(VD)) |
3771 | continue; |
3772 | auto It = Captures.find(VD); |
3773 | assert(It != Captures.end() && "Found lambda capture without field.")((void)0); |
3774 | LValue VarLVal = CGF.EmitLValueForFieldInitialization(VDLVal, It->second); |
3775 | Address VDAddr = CGF.GetAddrOfLocalVar(VD); |
3776 | if (VD->getType().getCanonicalType()->isReferenceType()) |
3777 | VDAddr = CGF.EmitLoadOfReferenceLValue(VDAddr, |
3778 | VD->getType().getCanonicalType()) |
3779 | .getAddress(CGF); |
3780 | CGF.EmitStoreOfScalar(VDAddr.getPointer(), VarLVal); |
3781 | } |
3782 | } |
3783 | } |
3784 | |
3785 | bool CGOpenMPRuntimeGPU::hasAllocateAttributeForGlobalVar(const VarDecl *VD, |
3786 | LangAS &AS) { |
3787 | if (!VD || !VD->hasAttr<OMPAllocateDeclAttr>()) |
3788 | return false; |
3789 | const auto *A = VD->getAttr<OMPAllocateDeclAttr>(); |
3790 | switch(A->getAllocatorType()) { |
3791 | case OMPAllocateDeclAttr::OMPNullMemAlloc: |
3792 | case OMPAllocateDeclAttr::OMPDefaultMemAlloc: |
3793 | // Not supported, fallback to the default mem space. |
3794 | case OMPAllocateDeclAttr::OMPThreadMemAlloc: |
3795 | case OMPAllocateDeclAttr::OMPLargeCapMemAlloc: |
3796 | case OMPAllocateDeclAttr::OMPCGroupMemAlloc: |
3797 | case OMPAllocateDeclAttr::OMPHighBWMemAlloc: |
3798 | case OMPAllocateDeclAttr::OMPLowLatMemAlloc: |
3799 | AS = LangAS::Default; |
3800 | return true; |
3801 | case OMPAllocateDeclAttr::OMPConstMemAlloc: |
3802 | AS = LangAS::cuda_constant; |
3803 | return true; |
3804 | case OMPAllocateDeclAttr::OMPPTeamMemAlloc: |
3805 | AS = LangAS::cuda_shared; |
3806 | return true; |
3807 | case OMPAllocateDeclAttr::OMPUserDefinedMemAlloc: |
3808 | llvm_unreachable("Expected predefined allocator for the variables with the "__builtin_unreachable() |
3809 | "static storage.")__builtin_unreachable(); |
3810 | } |
3811 | return false; |
3812 | } |
3813 | |
3814 | // Get current CudaArch and ignore any unknown values |
3815 | static CudaArch getCudaArch(CodeGenModule &CGM) { |
3816 | if (!CGM.getTarget().hasFeature("ptx")) |
3817 | return CudaArch::UNKNOWN; |
3818 | for (const auto &Feature : CGM.getTarget().getTargetOpts().FeatureMap) { |
3819 | if (Feature.getValue()) { |
3820 | CudaArch Arch = StringToCudaArch(Feature.getKey()); |
3821 | if (Arch != CudaArch::UNKNOWN) |
3822 | return Arch; |
3823 | } |
3824 | } |
3825 | return CudaArch::UNKNOWN; |
3826 | } |
3827 | |
3828 | /// Check to see if target architecture supports unified addressing which is |
3829 | /// a restriction for OpenMP requires clause "unified_shared_memory". |
3830 | void CGOpenMPRuntimeGPU::processRequiresDirective( |
3831 | const OMPRequiresDecl *D) { |
3832 | for (const OMPClause *Clause : D->clauselists()) { |
3833 | if (Clause->getClauseKind() == OMPC_unified_shared_memory) { |
3834 | CudaArch Arch = getCudaArch(CGM); |
3835 | switch (Arch) { |
3836 | case CudaArch::SM_20: |
3837 | case CudaArch::SM_21: |
3838 | case CudaArch::SM_30: |
3839 | case CudaArch::SM_32: |
3840 | case CudaArch::SM_35: |
3841 | case CudaArch::SM_37: |
3842 | case CudaArch::SM_50: |
3843 | case CudaArch::SM_52: |
3844 | case CudaArch::SM_53: { |
3845 | SmallString<256> Buffer; |
3846 | llvm::raw_svector_ostream Out(Buffer); |
3847 | Out << "Target architecture " << CudaArchToString(Arch) |
3848 | << " does not support unified addressing"; |
3849 | CGM.Error(Clause->getBeginLoc(), Out.str()); |
3850 | return; |
3851 | } |
3852 | case CudaArch::SM_60: |
3853 | case CudaArch::SM_61: |
3854 | case CudaArch::SM_62: |
3855 | case CudaArch::SM_70: |
3856 | case CudaArch::SM_72: |
3857 | case CudaArch::SM_75: |
3858 | case CudaArch::SM_80: |
3859 | case CudaArch::SM_86: |
3860 | case CudaArch::GFX600: |
3861 | case CudaArch::GFX601: |
3862 | case CudaArch::GFX602: |
3863 | case CudaArch::GFX700: |
3864 | case CudaArch::GFX701: |
3865 | case CudaArch::GFX702: |
3866 | case CudaArch::GFX703: |
3867 | case CudaArch::GFX704: |
3868 | case CudaArch::GFX705: |
3869 | case CudaArch::GFX801: |
3870 | case CudaArch::GFX802: |
3871 | case CudaArch::GFX803: |
3872 | case CudaArch::GFX805: |
3873 | case CudaArch::GFX810: |
3874 | case CudaArch::GFX900: |
3875 | case CudaArch::GFX902: |
3876 | case CudaArch::GFX904: |
3877 | case CudaArch::GFX906: |
3878 | case CudaArch::GFX908: |
3879 | case CudaArch::GFX909: |
3880 | case CudaArch::GFX90a: |
3881 | case CudaArch::GFX90c: |
3882 | case CudaArch::GFX1010: |
3883 | case CudaArch::GFX1011: |
3884 | case CudaArch::GFX1012: |
3885 | case CudaArch::GFX1013: |
3886 | case CudaArch::GFX1030: |
3887 | case CudaArch::GFX1031: |
3888 | case CudaArch::GFX1032: |
3889 | case CudaArch::GFX1033: |
3890 | case CudaArch::GFX1034: |
3891 | case CudaArch::GFX1035: |
3892 | case CudaArch::UNUSED: |
3893 | case CudaArch::UNKNOWN: |
3894 | break; |
3895 | case CudaArch::LAST: |
3896 | llvm_unreachable("Unexpected Cuda arch.")__builtin_unreachable(); |
3897 | } |
3898 | } |
3899 | } |
3900 | CGOpenMPRuntime::processRequiresDirective(D); |
3901 | } |
3902 | |
3903 | void CGOpenMPRuntimeGPU::clear() { |
3904 | |
3905 | if (!TeamsReductions.empty()) { |
3906 | ASTContext &C = CGM.getContext(); |
3907 | RecordDecl *StaticRD = C.buildImplicitRecord( |
3908 | "_openmp_teams_reduction_type_$_", RecordDecl::TagKind::TTK_Union); |
3909 | StaticRD->startDefinition(); |
3910 | for (const RecordDecl *TeamReductionRec : TeamsReductions) { |
3911 | QualType RecTy = C.getRecordType(TeamReductionRec); |
3912 | auto *Field = FieldDecl::Create( |
3913 | C, StaticRD, SourceLocation(), SourceLocation(), nullptr, RecTy, |
3914 | C.getTrivialTypeSourceInfo(RecTy, SourceLocation()), |
3915 | /*BW=*/nullptr, /*Mutable=*/false, |
3916 | /*InitStyle=*/ICIS_NoInit); |
3917 | Field->setAccess(AS_public); |
3918 | StaticRD->addDecl(Field); |
3919 | } |
3920 | StaticRD->completeDefinition(); |
3921 | QualType StaticTy = C.getRecordType(StaticRD); |
3922 | llvm::Type *LLVMReductionsBufferTy = |
3923 | CGM.getTypes().ConvertTypeForMem(StaticTy); |
3924 | // FIXME: nvlink does not handle weak linkage correctly (object with the |
3925 | // different size are reported as erroneous). |
3926 | // Restore CommonLinkage as soon as nvlink is fixed. |
3927 | auto *GV = new llvm::GlobalVariable( |
3928 | CGM.getModule(), LLVMReductionsBufferTy, |
3929 | /*isConstant=*/false, llvm::GlobalValue::InternalLinkage, |
3930 | llvm::Constant::getNullValue(LLVMReductionsBufferTy), |
3931 | "_openmp_teams_reductions_buffer_$_"); |
3932 | KernelTeamsReductionPtr->setInitializer( |
3933 | llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(GV, |
3934 | CGM.VoidPtrTy)); |
3935 | } |
3936 | CGOpenMPRuntime::clear(); |
3937 | } |