| /* Copyright 2022 The TensorFlow Authors. All Rights Reserved. |
| |
| Licensed under the Apache License, Version 2.0 (the "License"); |
| you may not use this file except in compliance with the License. |
| You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| ==============================================================================*/ |
| |
| // This files implements the logic for converting multidimensional |
| // `scf.parallel` loops into 1D loops. |
| |
| #include <memory> |
| #include <numeric> |
| #include <vector> |
| |
| #include "mlir-hlo/Transforms/PassDetail.h" |
| #include "mlir-hlo/Transforms/passes.h" |
| #include "mlir/Dialect/Func/IR/FuncOps.h" |
| #include "mlir/Dialect/SCF/IR/SCF.h" |
| #include "mlir/Dialect/SCF/Utils/Utils.h" |
| |
| using ::mlir::scf::ParallelOp; |
| |
| namespace mlir { |
| namespace { |
| |
| // This is the implementation of the CollapseParallelLoopsTo1D pass declared in |
| // include/mlir-hlo/Transforms/passes.td |
| struct CollapseParallelLoopsTo1D |
| : public CollapseParallelLoopsTo1DPassBase<CollapseParallelLoopsTo1D> { |
| void runOnOperation() override; |
| }; |
| |
| } // namespace |
| } // namespace mlir |
| |
| using namespace mlir; |
| |
| void mlir::CollapseParallelLoopsTo1D::runOnOperation() { |
| getOperation().walk([&](ParallelOp op) { |
| unsigned numLoops = op.getNumLoops(); |
| if (numLoops == 1) return; |
| std::vector<unsigned> combinedLoops(numLoops); |
| std::iota(combinedLoops.begin(), combinedLoops.end(), 0u); |
| mlir::collapseParallelLoops(op, {combinedLoops}); |
| }); |
| } |
| |
| std::unique_ptr<OperationPass<func::FuncOp>> |
| mlir::createCollapseParallelLoopsTo1DPass() { |
| return std::make_unique<CollapseParallelLoopsTo1D>(); |
| } |