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

     1  //===- TestLoopMapping.cpp --- Parametric loop mapping 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 parametrically map loop.for loops to virtual
    19  // processing element dimensions.
    20  //
    21  //===----------------------------------------------------------------------===//
    22  
    23  #include "mlir/Dialect/LoopOps/LoopOps.h"
    24  #include "mlir/IR/Builders.h"
    25  #include "mlir/Pass/Pass.h"
    26  #include "mlir/Transforms/LoopUtils.h"
    27  #include "mlir/Transforms/Passes.h"
    28  
    29  #include "llvm/ADT/SetVector.h"
    30  
    31  using namespace mlir;
    32  
    33  namespace {
    34  class TestLoopMappingPass : public FunctionPass<TestLoopMappingPass> {
    35  public:
    36    explicit TestLoopMappingPass() {}
    37  
    38    void runOnFunction() override {
    39      FuncOp func = getFunction();
    40  
    41      // SSA values for the transformation are created out of thin air by
    42      // unregistered "new_processor_id_and_range" operations. This is enough to
    43      // emulate mapping conditions.
    44      SmallVector<Value *, 8> processorIds, numProcessors;
    45      func.walk([&processorIds, &numProcessors](Operation *op) {
    46        if (op->getName().getStringRef() != "new_processor_id_and_range")
    47          return;
    48        processorIds.push_back(op->getResult(0));
    49        numProcessors.push_back(op->getResult(1));
    50      });
    51  
    52      func.walk([&processorIds, &numProcessors](loop::ForOp op) {
    53        // Ignore nested loops.
    54        if (op.getParentRegion()->getParentOfType<loop::ForOp>())
    55          return;
    56        mapLoopToProcessorIds(op, processorIds, numProcessors);
    57      });
    58    }
    59  };
    60  } // end namespace
    61  
    62  static PassRegistration<TestLoopMappingPass>
    63      reg("test-mapping-to-processing-elements",
    64          "test mapping a single loop on a virtual processor grid",
    65          [] { return std::make_unique<TestLoopMappingPass>(); });