diff --git a/flang/include/flang/Lower/OpenMP.h b/flang/include/flang/Lower/OpenMP.h
--- a/flang/include/flang/Lower/OpenMP.h
+++ b/flang/include/flang/Lower/OpenMP.h
@@ -13,13 +13,9 @@
#ifndef FORTRAN_LOWER_OPENMP_H
#define FORTRAN_LOWER_OPENMP_H
+#include "mlir/Dialect/OpenMP/OpenMPDialect.h"
#include <cinttypes>
-namespace mlir {
-class Value;
-class Operation;
-} // namespace mlir
-
namespace fir {
class FirOpBuilder;
class ConvertOp;
@@ -29,6 +25,7 @@
namespace parser {
struct OpenMPConstruct;
struct OpenMPDeclarativeConstruct;
+struct OpenMPDeclareTargetConstruct;
struct OmpEndLoopDirective;
struct OmpClauseList;
} // namespace parser
@@ -56,6 +53,17 @@
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 &);
+std::optional<mlir::omp::ClauseMemoryOrderKind>
+extractOpenMPRequiresClauses(const Fortran::parser::OmpClauseList &,
+ mlir::omp::ClauseRequires &);
+
+bool isOpenMPTargetConstruct(const parser::OpenMPConstruct &);
+
} // namespace lower
} // namespace Fortran
diff --git a/flang/lib/Lower/Bridge.cpp b/flang/lib/Lower/Bridge.cpp
--- a/flang/lib/Lower/Bridge.cpp
+++ b/flang/lib/Lower/Bridge.cpp
@@ -52,6 +52,7 @@
#include "flang/Semantics/runtime-type-info.h"
#include "flang/Semantics/tools.h"
#include "mlir/Dialect/ControlFlow/IR/ControlFlowOps.h"
+#include "mlir/Dialect/OpenMP/OpenMPDialect.h"
#include "mlir/IR/PatternMatch.h"
#include "mlir/Parser/Parser.h"
#include "mlir/Transforms/RegionUtils.h"
@@ -266,7 +267,8 @@
public:
explicit FirConverter(Fortran::lower::LoweringBridge &bridge)
: Fortran::lower::AbstractConverter(bridge.getLoweringOptions()),
- bridge{bridge}, foldingContext{bridge.createFoldingContext()} {}
+ bridge{bridge}, foldingContext{bridge.createFoldingContext()},
+ ompRequiresFlags{mlir::omp::ClauseRequires::none} {}
virtual ~FirConverter() = default;
/// Convert the PFT to FIR.
@@ -343,6 +345,16 @@
fir::runtime::genEnvironmentDefaults(*builder, toLocation(),
bridge.getEnvironmentDefaults());
});
+
+ // Set the module attributes related to OpenMP requires directives
+ if (auto mod = llvm::dyn_cast<mlir::omp::OffloadModuleInterface>(
+ getModuleOp().getOperation())) {
+ if (ompDeviceCodeFound)
+ mod.setRequires(ompRequiresFlags);
+
+ if (ompAtomicDefaultMemOrder)
+ mod.setAtomicDefaultMemOrder(*ompAtomicDefaultMemOrder);
+ }
}
/// Declare a function.
@@ -2053,10 +2065,57 @@
localSymbols.popScope();
builder->restoreInsertionPoint(insertPt);
+
+ // Register if a target region was found
+ ompDeviceCodeFound =
+ ompDeviceCodeFound || Fortran::lower::isOpenMPTargetConstruct(omp);
+ }
+
+ /// Extract information from OpenMP declarative constructs
+ void analyzeOpenMPDeclarative(
+ const Fortran::parser::OpenMPDeclarativeConstruct &ompDecl) {
+ auto analyzeRequires =
+ [&](const Fortran::parser::OpenMPRequiresConstruct &ompReq) {
+ using mlir::omp::ClauseRequires;
+
+ mlir::omp::ClauseRequires requiresFlags;
+ auto atomicDefaultMemOrder =
+ Fortran::lower::extractOpenMPRequiresClauses(
+ std::get<Fortran::parser::OmpClauseList>(ompReq.t),
+ requiresFlags);
+
+ if (requiresFlags != ClauseRequires::none)
+ ompRequiresFlags = ompRequiresFlags | requiresFlags;
+
+ if (atomicDefaultMemOrder)
+ ompAtomicDefaultMemOrder = atomicDefaultMemOrder;
+ };
+
+ auto analyzeDeclareTarget =
+ [&](const Fortran::parser::OpenMPDeclareTargetConstruct &ompReq) {
+ auto targetType =
+ Fortran::lower::getOpenMPDeclareTargetFunctionDevice(
+ *this, getEval(), ompReq);
+
+ ompDeviceCodeFound =
+ ompDeviceCodeFound ||
+ (targetType &&
+ *targetType != mlir::omp::DeclareTargetDeviceType::host);
+ };
+
+ std::visit(
+ Fortran::common::visitors{
+ analyzeRequires,
+ analyzeDeclareTarget,
+ // Add other OpenMP declarative constructs currently skipped
+ [&](const auto &) {},
+ },
+ ompDecl.u);
}
void genFIR(const Fortran::parser::OpenMPDeclarativeConstruct &ompDecl) {
mlir::OpBuilder::InsertPoint insertPt = builder->saveInsertionPoint();
+ analyzeOpenMPDeclarative(ompDecl);
genOpenMPDeclarativeConstruct(*this, getEval(), ompDecl);
for (Fortran::lower::pft::Evaluation &e : getEval().getNestedEvaluations())
genFIR(e);
@@ -4098,6 +4157,17 @@
/// Tuple of host associated variables
mlir::Value hostAssocTuple;
+
+ /// OpenMP Requires flags
+ mlir::omp::ClauseRequires ompRequiresFlags;
+
+ /// OpenMP Default memory order for atomic operations, as defined by a
+ /// 'requires' directive
+ std::optional<mlir::omp::ClauseMemoryOrderKind> ompAtomicDefaultMemOrder;
+
+ /// Whether an OpenMP target region or declare target function/subroutine
+ /// intended for device offloading has been detected
+ bool ompDeviceCodeFound = false;
};
} // namespace
diff --git a/flang/lib/Lower/OpenMP.cpp b/flang/lib/Lower/OpenMP.cpp
--- a/flang/lib/Lower/OpenMP.cpp
+++ b/flang/lib/Lower/OpenMP.cpp
@@ -24,7 +24,9 @@
#include "flang/Semantics/tools.h"
#include "mlir/Dialect/OpenMP/OpenMPDialect.h"
#include "mlir/Dialect/SCF/IR/SCF.h"
+#include "llvm/ADT/SmallVector.h"
#include "llvm/Frontend/OpenMP/OMPConstants.h"
+#include <optional>
using namespace mlir;
@@ -2239,11 +2241,13 @@
converter.bindSymbol(sym, symThreadprivateExv);
}
-void handleDeclareTarget(Fortran::lower::AbstractConverter &converter,
- Fortran::lower::pft::Evaluation &eval,
- const Fortran::parser::OpenMPDeclareTargetConstruct
- &declareTargetConstruct) {
- llvm::SmallVector<Fortran::semantics::Symbol, 0> symbols;
+/// 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::pft::Evaluation &eval,
+ const Fortran::parser::OpenMPDeclareTargetConstruct &declareTargetConstruct,
+ SmallVectorImpl<Fortran::semantics::Symbol> &symbols) {
+ // Gather the symbols
auto findFuncAndVarSyms = [&](const Fortran::parser::OmpObjectList &objList) {
for (const auto &ompObject : objList.v) {
Fortran::common::visit(
@@ -2261,12 +2265,11 @@
}
};
+ // The default capture type
+ auto deviceType = Fortran::parser::OmpDeviceTypeClause::Type::Any;
const auto &spec{std::get<Fortran::parser::OmpDeclareTargetSpecifier>(
declareTargetConstruct.t)};
- auto mod = converter.getFirOpBuilder().getModule();
- // The default capture type
- auto deviceType = Fortran::parser::OmpDeviceTypeClause::Type::Any;
if (const auto *objectList{
Fortran::parser::Unwrap<Fortran::parser::OmpObjectList>(spec.u)}) {
// Case: declare target(func, var1, var2)
@@ -2288,8 +2291,7 @@
std::get_if<Fortran::parser::OmpClause::Link>(
&clause.u)}) {
// Case: declare target link(var1, var2)...
- TODO(converter.getCurrentLocation(),
- "the link clause is currently unsupported");
+ TODO_NOLOC("the link clause is currently unsupported");
} else if (const auto *deviceClause{
std::get_if<Fortran::parser::OmpClause::DeviceType>(
&clause.u)}) {
@@ -2299,6 +2301,24 @@
}
}
+ switch (deviceType) {
+ case Fortran::parser::OmpDeviceTypeClause::Type::Any:
+ return mlir::omp::DeclareTargetDeviceType::any;
+ case Fortran::parser::OmpDeviceTypeClause::Type::Host:
+ return mlir::omp::DeclareTargetDeviceType::host;
+ case Fortran::parser::OmpDeviceTypeClause::Type::Nohost:
+ return mlir::omp::DeclareTargetDeviceType::nohost;
+ }
+}
+
+void handleDeclareTarget(Fortran::lower::AbstractConverter &converter,
+ Fortran::lower::pft::Evaluation &eval,
+ const Fortran::parser::OpenMPDeclareTargetConstruct
+ &declareTargetConstruct) {
+ SmallVector<Fortran::semantics::Symbol, 0> symbols;
+ auto deviceType = getDeclareTargetInfo(eval, declareTargetConstruct, symbols);
+
+ auto mod = converter.getFirOpBuilder().getModule();
for (auto sym : symbols) {
auto *op = mod.lookupSymbol(converter.mangleName(sym));
@@ -2309,20 +2329,6 @@
TODO(converter.getCurrentLocation(),
"only subroutines and functions are currently supported");
- mlir::omp::DeclareTargetDeviceType newDeviceType;
-
- switch (deviceType) {
- case Fortran::parser::OmpDeviceTypeClause::Type::Nohost:
- newDeviceType = mlir::omp::DeclareTargetDeviceType::nohost;
- break;
- case Fortran::parser::OmpDeviceTypeClause::Type::Host:
- newDeviceType = mlir::omp::DeclareTargetDeviceType::host;
- break;
- case Fortran::parser::OmpDeviceTypeClause::Type::Any:
- newDeviceType = mlir::omp::DeclareTargetDeviceType::any;
- break;
- }
-
// The function already has a declare target applied to it, very
// likely through implicit capture (usage in another declare target
// function/subroutine). It should be marked as any if it has been
@@ -2330,13 +2336,13 @@
// change
if (mlir::omp::OpenMPDialect::isDeclareTarget(fOp)) {
if (mlir::omp::OpenMPDialect::getDeclareTargetDeviceType(fOp) !=
- newDeviceType)
+ deviceType)
mlir::omp::OpenMPDialect::setDeclareTarget(
op, mlir::omp::DeclareTargetDeviceType::any);
continue;
}
- mlir::omp::OpenMPDialect::setDeclareTarget(op, newDeviceType);
+ mlir::omp::OpenMPDialect::setDeclareTarget(op, deviceType);
}
}
@@ -2366,7 +2372,11 @@
},
[&](const Fortran::parser::OpenMPRequiresConstruct
&requiresConstruct) {
- TODO(converter.getCurrentLocation(), "OpenMPRequiresConstruct");
+ // Requires directives are analyzed before any statements are
+ // lowered. Then, the result of combining the set of clauses of all
+ // requires directives present in the compilation unit is used to
+ // emit code, so no code is emitted independently for each
+ // "requires" instance.
},
[&](const Fortran::parser::OpenMPThreadprivate &threadprivate) {
// The directive is lowered when instantiating the variable to
@@ -2576,3 +2586,93 @@
}
}
}
+
+std::optional<mlir::omp::DeclareTargetDeviceType>
+Fortran::lower::getOpenMPDeclareTargetFunctionDevice(
+ Fortran::lower::AbstractConverter &converter,
+ Fortran::lower::pft::Evaluation &eval,
+ const Fortran::parser::OpenMPDeclareTargetConstruct
+ &declareTargetConstruct) {
+ SmallVector<Fortran::semantics::Symbol, 0> symbols;
+ auto deviceType = getDeclareTargetInfo(eval, declareTargetConstruct, symbols);
+
+ // Return the device type only if at least one of the targets for the
+ // directive is a function or subroutine
+ auto mod = converter.getFirOpBuilder().getModule();
+ for (auto sym : symbols) {
+ auto *op = mod.lookupSymbol(converter.mangleName(sym));
+
+ if (mlir::isa<mlir::func::FuncOp>(op))
+ return deviceType;
+ }
+
+ return std::nullopt;
+}
+
+std::optional<omp::ClauseMemoryOrderKind>
+Fortran::lower::extractOpenMPRequiresClauses(
+ const Fortran::parser::OmpClauseList &clauseList,
+ omp::ClauseRequires &requiresFlags) {
+ std::optional<omp::ClauseMemoryOrderKind> atomicDefaultMemOrder;
+ requiresFlags = omp::ClauseRequires::none;
+
+ for (const auto &clause : clauseList.v) {
+ if (const auto &atomicClause =
+ std::get_if<Fortran::parser::OmpClause::AtomicDefaultMemOrder>(
+ &clause.u)) {
+ switch (atomicClause->v.v) {
+ case Fortran::parser::OmpAtomicDefaultMemOrderClause::Type::SeqCst:
+ atomicDefaultMemOrder = omp::ClauseMemoryOrderKind::Seq_cst;
+ break;
+ case Fortran::parser::OmpAtomicDefaultMemOrderClause::Type::AcqRel:
+ atomicDefaultMemOrder = omp::ClauseMemoryOrderKind::Acq_rel;
+ break;
+ case Fortran::parser::OmpAtomicDefaultMemOrderClause::Type::Relaxed:
+ atomicDefaultMemOrder = omp::ClauseMemoryOrderKind::Relaxed;
+ break;
+ }
+ } else if (std::get_if<Fortran::parser::OmpClause::DynamicAllocators>(
+ &clause.u)) {
+ requiresFlags = requiresFlags | omp::ClauseRequires::dynamic_allocators;
+ } else if (std::get_if<Fortran::parser::OmpClause::ReverseOffload>(
+ &clause.u)) {
+ requiresFlags = requiresFlags | omp::ClauseRequires::reverse_offload;
+ } else if (std::get_if<Fortran::parser::OmpClause::UnifiedAddress>(
+ &clause.u)) {
+ requiresFlags = requiresFlags | omp::ClauseRequires::unified_address;
+ } else if (std::get_if<Fortran::parser::OmpClause::UnifiedSharedMemory>(
+ &clause.u)) {
+ requiresFlags =
+ requiresFlags | omp::ClauseRequires::unified_shared_memory;
+ }
+ }
+
+ return atomicDefaultMemOrder;
+}
+
+bool Fortran::lower::isOpenMPTargetConstruct(
+ const Fortran::parser::OpenMPConstruct &omp) {
+ if (const auto *blockDir =
+ std::get_if<Fortran::parser::OpenMPBlockConstruct>(&omp.u)) {
+ const auto &beginBlockDir{
+ std::get<Fortran::parser::OmpBeginBlockDirective>(blockDir->t)};
+ const auto &beginDir{
+ std::get<Fortran::parser::OmpBlockDirective>(beginBlockDir.t)};
+
+ switch (beginDir.v) {
+ case llvm::omp::Directive::OMPD_target:
+ case llvm::omp::Directive::OMPD_target_parallel:
+ case llvm::omp::Directive::OMPD_target_parallel_do:
+ case llvm::omp::Directive::OMPD_target_parallel_do_simd:
+ case llvm::omp::Directive::OMPD_target_simd:
+ case llvm::omp::Directive::OMPD_target_teams:
+ case llvm::omp::Directive::OMPD_target_teams_distribute:
+ case llvm::omp::Directive::OMPD_target_teams_distribute_simd:
+ return true;
+ default:
+ break;
+ }
+ }
+
+ return false;
+}
diff --git a/flang/test/Lower/OpenMP/requires-error.f90 b/flang/test/Lower/OpenMP/requires-error.f90
new file mode 100644
--- /dev/null
+++ b/flang/test/Lower/OpenMP/requires-error.f90
@@ -0,0 +1,15 @@
+! RUN: not %flang_fc1 -emit-fir -fopenmp %s -o - 2>&1 | 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: error: {{.*}} conflicting atomic_default_mem_order clause found:
+!CHECK-SAME: acq_rel != seq_cst
+program requires
+ !$omp requires atomic_default_mem_order(seq_cst)
+end program requires
+
+subroutine f()
+ !$omp requires atomic_default_mem_order(acq_rel)
+end subroutine f
diff --git a/flang/test/Lower/OpenMP/requires-notarget.f90 b/flang/test/Lower/OpenMP/requires-notarget.f90
new file mode 100644
--- /dev/null
+++ b/flang/test/Lower/OpenMP/requires-notarget.f90
@@ -0,0 +1,12 @@
+! 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-SAME: omp.atomic_default_mem_order = #omp<memoryorderkind seq_cst>
+!CHECK-NOT: omp.requires
+program requires
+ !$omp requires unified_shared_memory reverse_offload atomic_default_mem_order(seq_cst)
+end program requires
diff --git a/flang/test/Lower/OpenMP/requires.f90 b/flang/test/Lower/OpenMP/requires.f90
new file mode 100644
--- /dev/null
+++ b/flang/test/Lower/OpenMP/requires.f90
@@ -0,0 +1,14 @@
+! RUN: %flang_fc1 -emit-fir -fopenmp %s -o - | FileCheck %s
+
+! This test checks the lowering of requires into MLIR
+
+!CHECK: module attributes {
+!CHECK-SAME: omp.atomic_default_mem_order = #omp<memoryorderkind seq_cst>
+!CHECK-SAME: omp.requires = #omp<clause_requires reverse_offload|unified_shared_memory>
+program requires
+ !$omp requires unified_shared_memory reverse_offload atomic_default_mem_order(seq_cst)
+end program requires
+
+subroutine f
+ !$omp declare target
+end subroutine f