mlir/test/lib/Dialect/Affine/TestLoopPermutation.cpp

   1 //===- TestLoopPermutation.cpp - Test affine loop permutation -------------===//
   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 test the affine for op permutation utility.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "mlir/Dialect/Affine/Analysis/Utils.h"
  14 #include "mlir/Dialect/Affine/IR/AffineOps.h"
  15 #include "mlir/Dialect/Affine/LoopUtils.h"
  16 #include "mlir/Pass/Pass.h"
  17
  18 #define PASS_NAME "test-loop-permutation"
  19
  20 using namespace mlir;
  21
  22 namespace {
  23
  24 /// This pass applies the permutation on the first maximal perfect nest.
  25 struct TestLoopPermutation
  26     : public PassWrapper<TestLoopPermutation, OperationPass<>> {
  27   MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID(TestLoopPermutation)
  28
  29   StringRef getArgument() const final { return PASS_NAME; }
  30   StringRef getDescription() const final {
  31     return "Tests affine loop permutation utility";
  32   }
  33   TestLoopPermutation() = default;
  34   TestLoopPermutation(const TestLoopPermutation &pass) : PassWrapper(pass){};
  35
  36   void runOnOperation() override;
  37
  38 private:
  39   /// Permutation specifying loop i is mapped to permList[i] in
  40   /// transformed nest (with i going from outermost to innermost).
  41   ListOption<unsigned> permList{*this, "permutation-map",
  42                                 llvm::cl::desc("Specify the loop permutation"),
  43                                 llvm::cl::OneOrMore};
  44 };
  45
  46 } // namespace
  47
  48 void TestLoopPermutation::runOnOperation() {
  49
  50   SmallVector<unsigned, 4> permMap(permList.begin(), permList.end());
  51
  52   SmallVector<AffineForOp, 2> forOps;
  53   getOperation()->walk([&](AffineForOp forOp) { forOps.push_back(forOp); });
  54
  55   for (auto forOp : forOps) {
  56     SmallVector<AffineForOp, 6> nest;
  57     // Get the maximal perfect nest.
  58     getPerfectlyNestedLoops(nest, forOp);
  59     // Permute if the nest's size is consistent with the specified
  60     // permutation.
  61     if (nest.size() >= 2 && nest.size() == permMap.size()) {
  62       permuteLoops(nest, permMap);
  63     }
  64   }
  65 }
  66
  67 namespace mlir {
  68 void registerTestLoopPermutationPass() {
  69   PassRegistration<TestLoopPermutation>();
  70 }
  71 } // namespace mlir