github.com/johnnyeven/libtools@v0.0.0-20191126065708-61829c1adf46/third_party/mlir/lib/Analysis/TestParallelismDetection.cpp (about)

     1  //===- ParallelismDetection.cpp - Parallelism Detection pass ------------*-===//
     2  //
     3  // Copyright 2019 The MLIR Authors.
     4  //
     5  // Licensed under the Apache License, Version 2.0 (the "License");
     6  // you may not use this file except in compliance with the License.
     7  // You may obtain a copy of the License at
     8  //
     9  //   http://www.apache.org/licenses/LICENSE-2.0
    10  //
    11  // Unless required by applicable law or agreed to in writing, software
    12  // distributed under the License is distributed on an "AS IS" BASIS,
    13  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14  // See the License for the specific language governing permissions and
    15  // limitations under the License.
    16  // =============================================================================
    17  //
    18  // This file implements a pass to detect parallel affine 'affine.for' ops.
    19  //
    20  //===----------------------------------------------------------------------===//
    21  
    22  #include "mlir/Analysis/Passes.h"
    23  #include "mlir/Analysis/Utils.h"
    24  #include "mlir/Dialect/AffineOps/AffineOps.h"
    25  #include "mlir/IR/Builders.h"
    26  #include "mlir/Pass/Pass.h"
    27  
    28  using namespace mlir;
    29  
    30  namespace {
    31  
    32  struct TestParallelismDetection
    33      : public FunctionPass<TestParallelismDetection> {
    34    void runOnFunction() override;
    35  };
    36  
    37  } // end anonymous namespace
    38  
    39  FunctionPassBase *mlir::createParallelismDetectionTestPass() {
    40    return new TestParallelismDetection();
    41  }
    42  
    43  // Walks the function and emits a note for all 'affine.for' ops detected as
    44  // parallel.
    45  void TestParallelismDetection::runOnFunction() {
    46    FuncOp f = getFunction();
    47    OpBuilder b(f.getBody());
    48    f.walk([&](AffineForOp forOp) {
    49      if (isLoopParallel(forOp))
    50        forOp.emitRemark("parallel loop");
    51      else
    52        forOp.emitRemark("sequential loop");
    53    });
    54  }
    55  
    56  static PassRegistration<TestParallelismDetection>
    57      pass("test-detect-parallel", "Test parallelism detection ");