skatrak updated this revision to Diff 556436.
skatrak added a comment.
Update patch. Ping for review and unblocking remaining accepted REQUIRES
patches, thank you!
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D147218/new/
https://reviews.llvm.org/D147218
Files:
flang/include/flang/Lower/OpenMP.h
flang/lib/Lower/Bridge.cpp
flang/lib/Lower/OpenMP.cpp
flang/test/Lower/OpenMP/requires-notarget.f90
flang/test/Lower/OpenMP/requires.f90
Index: flang/test/Lower/OpenMP/requires.f90
===================================================================
--- /dev/null
+++ flang/test/Lower/OpenMP/requires.f90
@@ -0,0 +1,13 @@
+! RUN: %flang_fc1 -emit-fir -fopenmp %s -o - | FileCheck %s
+
+! This test checks the lowering of requires into MLIR
+
+!CHECK: module attributes {
+!CHECK-SAME: omp.requires = #omp<clause_requires reverse_offload|unified_shared_memory>
+program requires
+ !$omp requires unified_shared_memory reverse_offload atomic_default_mem_order(seq_cst)
+end program requires
+
+subroutine f
+ !$omp declare target
+end subroutine f
Index: flang/test/Lower/OpenMP/requires-notarget.f90
===================================================================
--- /dev/null
+++ flang/test/Lower/OpenMP/requires-notarget.f90
@@ -0,0 +1,11 @@
+! RUN: %flang_fc1 -emit-fir -fopenmp %s -o - | FileCheck %s
+
+! This test checks that requires lowering into MLIR skips creating the
+! omp.requires attribute with target-related clauses if there are no device
+! functions in the compilation unit
+
+!CHECK: module attributes {
+!CHECK-NOT: omp.requires
+program requires
+ !$omp requires unified_shared_memory reverse_offload atomic_default_mem_order(seq_cst)
+end program requires
Index: flang/lib/Lower/OpenMP.cpp
===================================================================
--- flang/lib/Lower/OpenMP.cpp
+++ flang/lib/Lower/OpenMP.cpp
@@ -2473,6 +2473,47 @@
reductionDeclSymbols));
}
+/// Extract the list of function and variable symbols affected by the given
+/// 'declare target' directive and return the intended device type for them.
+static mlir::omp::DeclareTargetDeviceType getDeclareTargetInfo(
+ Fortran::lower::AbstractConverter &converter,
+ Fortran::lower::pft::Evaluation &eval,
+ const Fortran::parser::OpenMPDeclareTargetConstruct &declareTargetConstruct,
+ llvm::SmallVectorImpl<DeclareTargetCapturePair> &symbolAndClause) {
+
+ // The default capture type
+ mlir::omp::DeclareTargetDeviceType deviceType =
+ mlir::omp::DeclareTargetDeviceType::any;
+ const auto &spec = std::get<Fortran::parser::OmpDeclareTargetSpecifier>(
+ declareTargetConstruct.t);
+
+ if (const auto *objectList{
+ Fortran::parser::Unwrap<Fortran::parser::OmpObjectList>(spec.u)}) {
+ // Case: declare target(func, var1, var2)
+ gatherFuncAndVarSyms(*objectList, mlir::omp::DeclareTargetCaptureClause::to,
+ symbolAndClause);
+ } else if (const auto *clauseList{
+ Fortran::parser::Unwrap<Fortran::parser::OmpClauseList>(
+ spec.u)}) {
+ if (clauseList->v.empty()) {
+ // Case: declare target, implicit capture of function
+ symbolAndClause.emplace_back(
+ mlir::omp::DeclareTargetCaptureClause::to,
+ eval.getOwningProcedure()->getSubprogramSymbol());
+ }
+
+ ClauseProcessor cp(converter, *clauseList);
+ cp.processTo(symbolAndClause);
+ cp.processLink(symbolAndClause);
+ cp.processDeviceType(deviceType);
+ cp.processTODO<Fortran::parser::OmpClause::Indirect>(
+ converter.getCurrentLocation(),
+ llvm::omp::Directive::OMPD_declare_target);
+ }
+
+ return deviceType;
+}
+
//===----------------------------------------------------------------------===//
// genOMP() Code generation helper functions
//===----------------------------------------------------------------------===//
@@ -3453,35 +3494,8 @@
&declareTargetConstruct) {
llvm::SmallVector<DeclareTargetCapturePair, 0> symbolAndClause;
mlir::ModuleOp mod = converter.getFirOpBuilder().getModule();
-
- // The default capture type
- mlir::omp::DeclareTargetDeviceType deviceType =
- mlir::omp::DeclareTargetDeviceType::any;
- const auto &spec = std::get<Fortran::parser::OmpDeclareTargetSpecifier>(
- declareTargetConstruct.t);
- if (const auto *objectList{
- Fortran::parser::Unwrap<Fortran::parser::OmpObjectList>(spec.u)}) {
- // Case: declare target(func, var1, var2)
- gatherFuncAndVarSyms(*objectList, mlir::omp::DeclareTargetCaptureClause::to,
- symbolAndClause);
- } else if (const auto *clauseList{
- Fortran::parser::Unwrap<Fortran::parser::OmpClauseList>(
- spec.u)}) {
- if (clauseList->v.empty()) {
- // Case: declare target, implicit capture of function
- symbolAndClause.emplace_back(
- mlir::omp::DeclareTargetCaptureClause::to,
- eval.getOwningProcedure()->getSubprogramSymbol());
- }
-
- ClauseProcessor cp(converter, *clauseList);
- cp.processTo(symbolAndClause);
- cp.processLink(symbolAndClause);
- cp.processDeviceType(deviceType);
- cp.processTODO<Fortran::parser::OmpClause::Indirect>(
- converter.getCurrentLocation(),
- llvm::omp::Directive::OMPD_declare_target);
- }
+ mlir::omp::DeclareTargetDeviceType deviceType = getDeclareTargetInfo(
+ converter, eval, declareTargetConstruct, symbolAndClause);
for (const DeclareTargetCapturePair &symClause : symbolAndClause) {
mlir::Operation *op = mod.lookupSymbol(
@@ -3585,6 +3599,28 @@
ompConstruct.u);
}
+void Fortran::lower::analyzeOpenMPDeclarativeConstruct(
+ Fortran::lower::AbstractConverter &converter,
+ Fortran::lower::pft::Evaluation &eval,
+ const Fortran::parser::OpenMPDeclarativeConstruct &ompDecl,
+ bool &ompDeviceCodeFound) {
+ std::visit(
+ Fortran::common::visitors{
+ [&](const Fortran::parser::OpenMPDeclareTargetConstruct &ompReq) {
+ mlir::omp::DeclareTargetDeviceType targetType =
+ Fortran::lower::getOpenMPDeclareTargetFunctionDevice(
+ converter, eval, ompReq)
+ .value_or(mlir::omp::DeclareTargetDeviceType::host);
+
+ ompDeviceCodeFound =
+ ompDeviceCodeFound ||
+ targetType != mlir::omp::DeclareTargetDeviceType::host;
+ },
+ [&](const auto &) {},
+ },
+ ompDecl.u);
+}
+
void Fortran::lower::genOpenMPDeclarativeConstruct(
Fortran::lower::AbstractConverter &converter,
Fortran::lower::pft::Evaluation &eval,
@@ -3610,7 +3646,10 @@
},
[&](const Fortran::parser::OpenMPRequiresConstruct
&requiresConstruct) {
- TODO(converter.getCurrentLocation(), "OpenMPRequiresConstruct");
+ // Requires directives are gathered and processed in semantics and
+ // then combined in the lowering bridge before triggering codegen
+ // just once. Hence, there is no need to lower each individual
+ // occurrence here.
},
[&](const Fortran::parser::OpenMPThreadprivate &threadprivate) {
// The directive is lowered when instantiating the variable to
@@ -3924,3 +3963,81 @@
}
}
}
+
+std::optional<mlir::omp::DeclareTargetDeviceType>
+Fortran::lower::getOpenMPDeclareTargetFunctionDevice(
+ Fortran::lower::AbstractConverter &converter,
+ Fortran::lower::pft::Evaluation &eval,
+ const Fortran::parser::OpenMPDeclareTargetConstruct
+ &declareTargetConstruct) {
+ llvm::SmallVector<DeclareTargetCapturePair, 0> symbolAndClause;
+ mlir::omp::DeclareTargetDeviceType deviceType = getDeclareTargetInfo(
+ converter, eval, declareTargetConstruct, symbolAndClause);
+
+ // Return the device type only if at least one of the targets for the
+ // directive is a function or subroutine
+ mlir::ModuleOp mod = converter.getFirOpBuilder().getModule();
+ for (std::pair<mlir::omp::DeclareTargetCaptureClause,
+ Fortran::semantics::Symbol>
+ sym : symbolAndClause) {
+ mlir::Operation *op =
+ mod.lookupSymbol(converter.mangleName(std::get<1>(sym)));
+
+ if (mlir::isa<mlir::func::FuncOp>(op))
+ return deviceType;
+ }
+
+ return std::nullopt;
+}
+
+bool Fortran::lower::isOpenMPTargetConstruct(
+ const Fortran::parser::OpenMPConstruct &omp) {
+ llvm::omp::Directive dir = llvm::omp::Directive::OMPD_unknown;
+ if (const auto *block =
+ std::get_if<Fortran::parser::OpenMPBlockConstruct>(&omp.u)) {
+ const auto &begin =
+ std::get<Fortran::parser::OmpBeginBlockDirective>(block->t);
+ dir = std::get<Fortran::parser::OmpBlockDirective>(begin.t).v;
+ } else if (const auto *loop =
+ std::get_if<Fortran::parser::OpenMPLoopConstruct>(&omp.u)) {
+ const auto &begin =
+ std::get<Fortran::parser::OmpBeginLoopDirective>(loop->t);
+ dir = std::get<Fortran::parser::OmpLoopDirective>(begin.t).v;
+ }
+ return llvm::omp::allTargetSet.test(dir);
+}
+
+void Fortran::lower::genOpenMPRequires(
+ mlir::Operation *mod, const Fortran::semantics::Symbol *symbol) {
+ using MlirRequires = mlir::omp::ClauseRequires;
+ using SemaRequires = Fortran::semantics::WithOmpDeclarative::RequiresFlag;
+
+ if (auto offloadMod =
+ llvm::dyn_cast<mlir::omp::OffloadModuleInterface>(mod)) {
+ Fortran::semantics::WithOmpDeclarative::RequiresFlags semaFlags;
+ if (symbol) {
+ Fortran::common::visit(
+ [&](const auto &details) {
+ if constexpr (std::is_base_of_v<
+ Fortran::semantics::WithOmpDeclarative,
+ std::decay_t<decltype(details)>>) {
+ if (details.has_ompRequires())
+ semaFlags = *details.ompRequires();
+ }
+ },
+ symbol->details());
+ }
+
+ MlirRequires mlirFlags = MlirRequires::none;
+ if (semaFlags.test(SemaRequires::ReverseOffload))
+ mlirFlags = mlirFlags | MlirRequires::reverse_offload;
+ if (semaFlags.test(SemaRequires::UnifiedAddress))
+ mlirFlags = mlirFlags | MlirRequires::unified_address;
+ if (semaFlags.test(SemaRequires::UnifiedSharedMemory))
+ mlirFlags = mlirFlags | MlirRequires::unified_shared_memory;
+ if (semaFlags.test(SemaRequires::DynamicAllocators))
+ mlirFlags = mlirFlags | MlirRequires::dynamic_allocators;
+
+ offloadMod.setRequires(mlirFlags);
+ }
+}
Index: flang/lib/Lower/Bridge.cpp
===================================================================
--- flang/lib/Lower/Bridge.cpp
+++ flang/lib/Lower/Bridge.cpp
@@ -50,6 +50,7 @@
#include "flang/Parser/parse-tree.h"
#include "flang/Runtime/iostat.h"
#include "flang/Semantics/runtime-type-info.h"
+#include "flang/Semantics/symbol.h"
#include "flang/Semantics/tools.h"
#include "mlir/Dialect/ControlFlow/IR/ControlFlowOps.h"
#include "mlir/IR/PatternMatch.h"
@@ -294,12 +295,15 @@
// that they are available before lowering any function that may use
// them.
bool hasMainProgram = false;
+ const Fortran::semantics::Symbol *globalOmpRequiresSymbol = nullptr;
for (Fortran::lower::pft::Program::Units &u : pft.getUnits()) {
std::visit(Fortran::common::visitors{
[&](Fortran::lower::pft::FunctionLikeUnit &f) {
if (f.isMainProgram())
hasMainProgram = true;
declareFunction(f);
+ if (!globalOmpRequiresSymbol)
+ globalOmpRequiresSymbol = f.getScope().symbol();
},
[&](Fortran::lower::pft::ModuleLikeUnit &m) {
lowerModuleDeclScope(m);
@@ -307,7 +311,10 @@
m.nestedFunctions)
declareFunction(f);
},
- [&](Fortran::lower::pft::BlockDataUnit &b) {},
+ [&](Fortran::lower::pft::BlockDataUnit &b) {
+ if (!globalOmpRequiresSymbol)
+ globalOmpRequiresSymbol = b.symTab.symbol();
+ },
[&](Fortran::lower::pft::CompilerDirectiveUnit &d) {},
},
u);
@@ -352,6 +359,7 @@
});
finalizeOpenACCLowering();
+ finalizeOpenMPLowering(globalOmpRequiresSymbol);
}
/// Declare a function.
@@ -2345,10 +2353,16 @@
localSymbols.popScope();
builder->restoreInsertionPoint(insertPt);
+
+ // Register if a target region was found
+ ompDeviceCodeFound =
+ ompDeviceCodeFound || Fortran::lower::isOpenMPTargetConstruct(omp);
}
void genFIR(const Fortran::parser::OpenMPDeclarativeConstruct &ompDecl) {
mlir::OpBuilder::InsertPoint insertPt = builder->saveInsertionPoint();
+ analyzeOpenMPDeclarativeConstruct(*this, getEval(), ompDecl,
+ ompDeviceCodeFound);
genOpenMPDeclarativeConstruct(*this, getEval(), ompDecl);
for (Fortran::lower::pft::Evaluation &e : getEval().getNestedEvaluations())
genFIR(e);
@@ -4756,6 +4770,16 @@
accRoutineInfos);
}
+ /// Performing OpenMP lowering actions that were deferred to the end of
+ /// lowering.
+ void finalizeOpenMPLowering(
+ const Fortran::semantics::Symbol *globalOmpRequiresSymbol) {
+ // Set the module attribute related to OpenMP requires directives
+ if (ompDeviceCodeFound)
+ Fortran::lower::genOpenMPRequires(getModuleOp().getOperation(),
+ globalOmpRequiresSymbol);
+ }
+
//===--------------------------------------------------------------------===//
Fortran::lower::LoweringBridge &bridge;
@@ -4802,6 +4826,10 @@
/// Deferred OpenACC routine attachment.
Fortran::lower::AccRoutineInfoMappingList accRoutineInfos;
+
+ /// Whether an OpenMP target region or declare target function/subroutine
+ /// intended for device offloading has been detected
+ bool ompDeviceCodeFound = false;
};
} // namespace
Index: flang/include/flang/Lower/OpenMP.h
===================================================================
--- flang/include/flang/Lower/OpenMP.h
+++ flang/include/flang/Lower/OpenMP.h
@@ -13,6 +13,7 @@
#ifndef FORTRAN_LOWER_OPENMP_H
#define FORTRAN_LOWER_OPENMP_H
+#include "mlir/Dialect/OpenMP/OpenMPDialect.h"
#include <cinttypes>
namespace mlir {
@@ -30,10 +31,15 @@
namespace parser {
struct OpenMPConstruct;
struct OpenMPDeclarativeConstruct;
+struct OpenMPDeclareTargetConstruct;
struct OmpEndLoopDirective;
struct OmpClauseList;
} // namespace parser
+namespace semantics {
+class Symbol;
+} // namespace semantics
+
namespace lower {
class AbstractConverter;
@@ -49,6 +55,9 @@
void genOpenMPConstruct(AbstractConverter &, pft::Evaluation &,
const parser::OpenMPConstruct &);
+void analyzeOpenMPDeclarativeConstruct(
+ Fortran::lower::AbstractConverter &, Fortran::lower::pft::Evaluation &,
+ const parser::OpenMPDeclarativeConstruct &, bool &);
void genOpenMPDeclarativeConstruct(AbstractConverter &, pft::Evaluation &,
const parser::OpenMPDeclarativeConstruct &);
int64_t getCollapseValue(const Fortran::parser::OmpClauseList &clauseList);
@@ -62,6 +71,15 @@
void updateReduction(mlir::Operation *, fir::FirOpBuilder &, mlir::Value,
mlir::Value, fir::ConvertOp * = nullptr);
void removeStoreOp(mlir::Operation *, mlir::Value);
+
+std::optional<mlir::omp::DeclareTargetDeviceType>
+getOpenMPDeclareTargetFunctionDevice(
+ Fortran::lower::AbstractConverter &, Fortran::lower::pft::Evaluation &,
+ const Fortran::parser::OpenMPDeclareTargetConstruct &);
+bool isOpenMPTargetConstruct(const parser::OpenMPConstruct &);
+
+void genOpenMPRequires(mlir::Operation *, const Fortran::semantics::Symbol *);
+
} // namespace lower
} // namespace Fortran
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