mlir/test/lib/Dialect/SCF/TestLoopParametricTiling.cpp

   1 //===- TestLoopParametricTiling.cpp --- Parametric loop tiling pass -------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file implements a pass to parametrically tile nests of standard loops.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "mlir/Dialect/SCF/IR/SCF.h"
  14 #include "mlir/Dialect/SCF/Utils/Utils.h"
  15 #include "mlir/IR/Builders.h"
  16 #include "mlir/Pass/Pass.h"
  17
  18 using namespace mlir;
  19
  20 namespace {
  21
  22 // Extracts fixed-range loops for top-level loop nests with ranges defined in
  23 // the pass constructor.  Assumes loops are permutable.
  24 class SimpleParametricLoopTilingPass
  25     : public PassWrapper<SimpleParametricLoopTilingPass, OperationPass<>> {
  26 public:
  27   MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID(SimpleParametricLoopTilingPass)
  28
  29   StringRef getArgument() const final {
  30     return "test-extract-fixed-outer-loops";
  31   }
  32   StringRef getDescription() const final {
  33     return "test application of parametric tiling to the outer loops so that "
  34            "the ranges of outer loops become static";
  35   }
  36   SimpleParametricLoopTilingPass() = default;
  37   SimpleParametricLoopTilingPass(const SimpleParametricLoopTilingPass &) {}
  38   explicit SimpleParametricLoopTilingPass(ArrayRef<int64_t> outerLoopSizes) {
  39     sizes = outerLoopSizes;
  40   }
  41
  42   void runOnOperation() override {
  43     if (sizes.empty()) {
  44       emitError(
  45           UnknownLoc::get(&getContext()),
  46           "missing `test-outer-loop-sizes` pass-option for outer loop sizes");
  47       signalPassFailure();
  48       return;
  49     }
  50     getOperation()->walk([this](scf::ForOp op) {
  51       // Ignore nested loops.
  52       if (op->getParentRegion()->getParentOfType<scf::ForOp>())
  53         return;
  54       extractFixedOuterLoops(op, sizes);
  55     });
  56   }
  57
  58   ListOption<int64_t> sizes{
  59       *this, "test-outer-loop-sizes",
  60       llvm::cl::desc(
  61           "fixed number of iterations that the outer loops should have")};
  62 };
  63 } // namespace
  64
  65 namespace mlir {
  66 namespace test {
  67 void registerSimpleParametricTilingPass() {
  68   PassRegistration<SimpleParametricLoopTilingPass>();
  69 }
  70 } // namespace test
  71 } // namespace mlir