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

     1  //===- TestLoopParametricTiling.cpp --- Parametric loop tiling 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 tile nests of standard loops.
    19  //
    20  //===----------------------------------------------------------------------===//
    21  
    22  #include "mlir/Dialect/LoopOps/LoopOps.h"
    23  #include "mlir/IR/Builders.h"
    24  #include "mlir/Pass/Pass.h"
    25  #include "mlir/Transforms/LoopUtils.h"
    26  #include "mlir/Transforms/Passes.h"
    27  
    28  using namespace mlir;
    29  
    30  static llvm::cl::list<int> clOuterLoopSizes(
    31      "test-outer-loop-sizes", llvm::cl::MiscFlags::CommaSeparated,
    32      llvm::cl::desc(
    33          "fixed number of iterations that the outer loops should have"));
    34  
    35  namespace {
    36  // Extracts fixed-range loops for top-level loop nests with ranges defined in
    37  // the pass constructor.  Assumes loops are permutable.
    38  class SimpleParametricLoopTilingPass
    39      : public FunctionPass<SimpleParametricLoopTilingPass> {
    40  public:
    41    explicit SimpleParametricLoopTilingPass(ArrayRef<int64_t> outerLoopSizes)
    42        : sizes(outerLoopSizes.begin(), outerLoopSizes.end()) {}
    43  
    44    void runOnFunction() override {
    45      FuncOp func = getFunction();
    46      func.walk([this](loop::ForOp op) {
    47        // Ignore nested loops.
    48        if (op.getParentRegion()->getParentOfType<loop::ForOp>())
    49          return;
    50        extractFixedOuterLoops(op, sizes);
    51      });
    52    }
    53  
    54    SmallVector<int64_t, 4> sizes;
    55  };
    56  } // end namespace
    57  
    58  std::unique_ptr<FunctionPassBase>
    59  mlir::createSimpleParametricTilingPass(ArrayRef<int64_t> outerLoopSizes) {
    60    return std::make_unique<SimpleParametricLoopTilingPass>(outerLoopSizes);
    61  }
    62  
    63  static PassRegistration<SimpleParametricLoopTilingPass>
    64      reg("test-extract-fixed-outer-loops",
    65          "test application of parametric tiling to the outer loops so that the "
    66          "ranges of outer loops become static",
    67          [] {
    68            auto pass = std::make_unique<SimpleParametricLoopTilingPass>(
    69                ArrayRef<int64_t>{});
    70            pass->sizes.assign(clOuterLoopSizes.begin(), clOuterLoopSizes.end());
    71            return pass;
    72          });