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//===-- CUFDeviceGlobal.cpp -----------------------------------------------===//
//
// 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/Optimizer/Builder/CUFCommon.h"
#include "flang/Optimizer/Dialect/CUF/CUFOps.h"
#include "flang/Optimizer/Dialect/FIRDialect.h"
#include "flang/Optimizer/Dialect/FIROps.h"
#include "flang/Optimizer/HLFIR/HLFIROps.h"
#include "flang/Optimizer/Support/InternalNames.h"
#include "flang/Runtime/CUDA/common.h"
#include "flang/Runtime/allocatable.h"
#include "flang/Support/Fortran.h"
#include "mlir/Dialect/LLVMIR/NVVMDialect.h"
#include "mlir/IR/SymbolTable.h"
#include "mlir/Pass/Pass.h"
#include "mlir/Transforms/DialectConversion.h"
#include "llvm/ADT/DenseSet.h"
namespace fir {
#define GEN_PASS_DEF_CUFDEVICEGLOBAL
#include "flang/Optimizer/Transforms/Passes.h.inc"
} // namespace fir
namespace {
static void processAddrOfOp(fir::AddrOfOp addrOfOp,
mlir::SymbolTable &symbolTable,
llvm::DenseSet<fir::GlobalOp> &candidates,
bool recurseInGlobal) {
// Check if there is a real use of the global.
if (addrOfOp.getOperation()->hasOneUse()) {
mlir::OpOperand &addrUse = *addrOfOp.getOperation()->getUses().begin();
if (mlir::isa<fir::DeclareOp>(addrUse.getOwner()) &&
addrUse.getOwner()->use_empty())
return;
}
if (auto globalOp = symbolTable.lookup<fir::GlobalOp>(
addrOfOp.getSymbol().getRootReference().getValue())) {
// TO DO: limit candidates to non-scalars. Scalars appear to have been
// folded in already.
if (recurseInGlobal)
globalOp.walk([&](fir::AddrOfOp op) {
processAddrOfOp(op, symbolTable, candidates, recurseInGlobal);
});
candidates.insert(globalOp);
}
}
static void processTypeDescriptor(fir::RecordType recTy,
mlir::SymbolTable &symbolTable,
llvm::DenseSet<fir::GlobalOp> &candidates) {
if (auto globalOp = symbolTable.lookup<fir::GlobalOp>(
fir::NameUniquer::getTypeDescriptorName(recTy.getName()))) {
if (!candidates.contains(globalOp)) {
globalOp.walk([&](fir::AddrOfOp op) {
processAddrOfOp(op, symbolTable, candidates,
/*recurseInGlobal=*/true);
});
candidates.insert(globalOp);
}
}
}
static void processEmboxOp(fir::EmboxOp emboxOp, mlir::SymbolTable &symbolTable,
llvm::DenseSet<fir::GlobalOp> &candidates) {
if (auto recTy = mlir::dyn_cast<fir::RecordType>(
fir::unwrapRefType(emboxOp.getMemref().getType())))
processTypeDescriptor(recTy, symbolTable, candidates);
}
static void
prepareImplicitDeviceGlobals(mlir::func::FuncOp funcOp,
mlir::SymbolTable &symbolTable,
llvm::DenseSet<fir::GlobalOp> &candidates) {
auto cudaProcAttr{
funcOp->getAttrOfType<cuf::ProcAttributeAttr>(cuf::getProcAttrName())};
if (cudaProcAttr && cudaProcAttr.getValue() != cuf::ProcAttribute::Host) {
funcOp.walk([&](fir::AddrOfOp op) {
processAddrOfOp(op, symbolTable, candidates, /*recurseInGlobal=*/false);
});
funcOp.walk(
[&](fir::EmboxOp op) { processEmboxOp(op, symbolTable, candidates); });
}
}
static void
processPotentialTypeDescriptor(mlir::Type candidateType,
mlir::SymbolTable &symbolTable,
llvm::DenseSet<fir::GlobalOp> &candidates) {
if (auto boxTy = mlir::dyn_cast<fir::BaseBoxType>(candidateType))
candidateType = boxTy.getEleTy();
candidateType = fir::unwrapSequenceType(fir::unwrapRefType(candidateType));
if (auto recTy = mlir::dyn_cast<fir::RecordType>(candidateType))
processTypeDescriptor(recTy, symbolTable, candidates);
}
class CUFDeviceGlobal : public fir::impl::CUFDeviceGlobalBase<CUFDeviceGlobal> {
public:
void runOnOperation() override {
mlir::Operation *op = getOperation();
mlir::ModuleOp mod = mlir::dyn_cast<mlir::ModuleOp>(op);
if (!mod)
return signalPassFailure();
llvm::DenseSet<fir::GlobalOp> candidates;
mlir::SymbolTable symTable(mod);
mod.walk([&](mlir::func::FuncOp funcOp) {
prepareImplicitDeviceGlobals(funcOp, symTable, candidates);
return mlir::WalkResult::advance();
});
mod.walk([&](cuf::KernelOp kernelOp) {
kernelOp.walk([&](fir::AddrOfOp addrOfOp) {
processAddrOfOp(addrOfOp, symTable, candidates,
/*recurseInGlobal=*/false);
});
});
// Copying the device global variable into the gpu module
mlir::SymbolTable parentSymTable(mod);
auto gpuMod = cuf::getOrCreateGPUModule(mod, parentSymTable);
if (!gpuMod)
return signalPassFailure();
mlir::SymbolTable gpuSymTable(gpuMod);
for (auto globalOp : mod.getOps<fir::GlobalOp>()) {
if (cuf::isRegisteredDeviceGlobal(globalOp)) {
candidates.insert(globalOp);
processPotentialTypeDescriptor(globalOp.getType(), parentSymTable,
candidates);
} else if (globalOp.getConstant() &&
mlir::isa<fir::SequenceType>(
fir::unwrapRefType(globalOp.resultType()))) {
mlir::Attribute initAttr =
globalOp.getInitVal().value_or(mlir::Attribute());
if (initAttr && mlir::dyn_cast<mlir::DenseElementsAttr>(initAttr))
candidates.insert(globalOp);
}
}
for (auto globalOp : candidates) {
auto globalName{globalOp.getSymbol().getValue()};
if (gpuSymTable.lookup<fir::GlobalOp>(globalName)) {
break;
}
gpuSymTable.insert(globalOp->clone());
}
}
};
} // namespace
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