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//===-- lib/Utisl/OpenMP.cpp ------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "flang/Utils/OpenMP.h"
#include "flang/Lower/ConvertExprToHLFIR.h"
#include "flang/Optimizer/Builder/DirectivesCommon.h"
#include "flang/Optimizer/Builder/FIRBuilder.h"
#include "flang/Optimizer/Dialect/FIROps.h"
#include "flang/Optimizer/Dialect/FIRType.h"
#include "mlir/Dialect/OpenMP/OpenMPDialect.h"
#include "mlir/Transforms/RegionUtils.h"
namespace Fortran::utils::openmp {
mlir::omp::MapInfoOp createMapInfoOp(mlir::OpBuilder &builder,
mlir::Location loc, mlir::Value baseAddr, mlir::Value varPtrPtr,
llvm::StringRef name, llvm::ArrayRef<mlir::Value> bounds,
llvm::ArrayRef<mlir::Value> members, mlir::ArrayAttr membersIndex,
mlir::omp::ClauseMapFlags mapType,
mlir::omp::VariableCaptureKind mapCaptureType, mlir::Type retTy,
bool partialMap, mlir::FlatSymbolRefAttr mapperId) {
if (auto boxTy = llvm::dyn_cast<fir::BaseBoxType>(baseAddr.getType())) {
baseAddr = fir::BoxAddrOp::create(builder, loc, baseAddr);
retTy = baseAddr.getType();
}
mlir::TypeAttr varType = mlir::TypeAttr::get(
llvm::cast<mlir::omp::PointerLikeType>(retTy).getElementType());
// For types with unknown extents such as <2x?xi32> we discard the incomplete
// type info and only retain the base type. The correct dimensions are later
// recovered through the bounds info.
if (auto seqType = llvm::dyn_cast<fir::SequenceType>(varType.getValue()))
if (seqType.hasDynamicExtents())
varType = mlir::TypeAttr::get(seqType.getEleTy());
mlir::omp::MapInfoOp op =
mlir::omp::MapInfoOp::create(builder, loc, retTy, baseAddr, varType,
builder.getAttr<mlir::omp::ClauseMapFlagsAttr>(mapType),
builder.getAttr<mlir::omp::VariableCaptureKindAttr>(mapCaptureType),
varPtrPtr, members, membersIndex, bounds, mapperId,
builder.getStringAttr(name), builder.getBoolAttr(partialMap));
return op;
}
mlir::Value mapTemporaryValue(fir::FirOpBuilder &firOpBuilder,
mlir::omp::TargetOp targetOp, mlir::Value val, llvm::StringRef name) {
mlir::OpBuilder::InsertionGuard guard(firOpBuilder);
mlir::Operation *valOp = val.getDefiningOp();
if (valOp)
firOpBuilder.setInsertionPointAfter(valOp);
else
// This means val is a block argument
firOpBuilder.setInsertionPoint(targetOp);
auto copyVal = firOpBuilder.createTemporary(val.getLoc(), val.getType());
firOpBuilder.createStoreWithConvert(copyVal.getLoc(), val, copyVal);
fir::factory::AddrAndBoundsInfo info = fir::factory::getDataOperandBaseAddr(
firOpBuilder, val, /*isOptional=*/false, val.getLoc());
llvm::SmallVector<mlir::Value> bounds =
fir::factory::genImplicitBoundsOps<mlir::omp::MapBoundsOp,
mlir::omp::MapBoundsType>(firOpBuilder, info,
hlfir::translateToExtendedValue(
val.getLoc(), firOpBuilder, hlfir::Entity{val})
.first,
/*dataExvIsAssumedSize=*/false, val.getLoc());
firOpBuilder.setInsertionPoint(targetOp);
mlir::omp::ClauseMapFlags mapFlag = mlir::omp::ClauseMapFlags::implicit;
mlir::omp::VariableCaptureKind captureKind =
mlir::omp::VariableCaptureKind::ByRef;
mlir::Type eleType = copyVal.getType();
if (auto refType = mlir::dyn_cast<fir::ReferenceType>(copyVal.getType())) {
eleType = refType.getElementType();
}
if (fir::isa_trivial(eleType) || fir::isa_char(eleType)) {
captureKind = mlir::omp::VariableCaptureKind::ByCopy;
} else if (!fir::isa_builtin_cptr_type(eleType)) {
mapFlag |= mlir::omp::ClauseMapFlags::to;
}
mlir::Value mapOp = createMapInfoOp(firOpBuilder, copyVal.getLoc(), copyVal,
/*varPtrPtr=*/mlir::Value{}, name.str(), bounds,
/*members=*/llvm::SmallVector<mlir::Value>{},
/*membersIndex=*/mlir::ArrayAttr{}, mapFlag, captureKind,
copyVal.getType());
auto argIface = llvm::cast<mlir::omp::BlockArgOpenMPOpInterface>(*targetOp);
mlir::Region ®ion = targetOp.getRegion();
// Get the index of the first non-map argument before modifying mapVars,
// then append an element to mapVars and an associated entry block
// argument at that index.
unsigned insertIndex =
argIface.getMapBlockArgsStart() + argIface.numMapBlockArgs();
targetOp.getMapVarsMutable().append(mapOp);
mlir::Value clonedValArg =
region.insertArgument(insertIndex, copyVal.getType(), copyVal.getLoc());
mlir::Block *entryBlock = ®ion.getBlocks().front();
firOpBuilder.setInsertionPointToStart(entryBlock);
auto loadOp =
fir::LoadOp::create(firOpBuilder, clonedValArg.getLoc(), clonedValArg);
return loadOp.getResult();
}
void cloneOrMapRegionOutsiders(
fir::FirOpBuilder &firOpBuilder, mlir::omp::TargetOp targetOp) {
mlir::Region ®ion = targetOp.getRegion();
mlir::Block *entryBlock = ®ion.getBlocks().front();
llvm::SetVector<mlir::Value> valuesDefinedAbove;
mlir::getUsedValuesDefinedAbove(region, valuesDefinedAbove);
while (!valuesDefinedAbove.empty()) {
for (mlir::Value val : valuesDefinedAbove) {
mlir::Operation *valOp = val.getDefiningOp();
// NOTE: We skip BoxDimsOp's as the lesser of two evils is to map the
// indices separately, as the alternative is to eventually map the Box,
// which comes with a fairly large overhead comparatively. We could be
// more robust about this and check using a BackwardsSlice to see if we
// run the risk of mapping a box.
if (valOp && mlir::isMemoryEffectFree(valOp) &&
!mlir::isa<fir::BoxDimsOp>(valOp)) {
mlir::Operation *clonedOp = valOp->clone();
entryBlock->push_front(clonedOp);
auto replace = [entryBlock](mlir::OpOperand &use) {
return use.getOwner()->getBlock() == entryBlock;
};
valOp->getResults().replaceUsesWithIf(clonedOp->getResults(), replace);
valOp->replaceUsesWithIf(clonedOp, replace);
} else {
mlir::Value mappedTemp = mapTemporaryValue(firOpBuilder, targetOp, val,
/*name=*/{});
val.replaceUsesWithIf(mappedTemp, [entryBlock](mlir::OpOperand &use) {
return use.getOwner()->getBlock() == entryBlock;
});
}
}
valuesDefinedAbove.clear();
mlir::getUsedValuesDefinedAbove(region, valuesDefinedAbove);
}
}
} // namespace Fortran::utils::openmp
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