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/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   StringRef getArgument() const final {
28     return "test-extract-fixed-outer-loops";
29   }
30   StringRef getDescription() const final {
31     return "test application of parametric tiling to the outer loops so that "
32            "the ranges of outer loops become static";
33   }
34   SimpleParametricLoopTilingPass() = default;
35   SimpleParametricLoopTilingPass(const SimpleParametricLoopTilingPass &) {}
36   explicit SimpleParametricLoopTilingPass(ArrayRef<int64_t> outerLoopSizes) {
37     sizes = outerLoopSizes;
38   }
39 
40   void runOnOperation() override {
41     getOperation()->walk([this](scf::ForOp op) {
42       // Ignore nested loops.
43       if (op->getParentRegion()->getParentOfType<scf::ForOp>())
44         return;
45       extractFixedOuterLoops(op, sizes);
46     });
47   }
48 
49   ListOption<int64_t> sizes{
50       *this, "test-outer-loop-sizes", llvm::cl::MiscFlags::CommaSeparated,
51       llvm::cl::desc(
52           "fixed number of iterations that the outer loops should have")};
53 };
54 } // namespace
55 
56 namespace mlir {
57 namespace test {
58 void registerSimpleParametricTilingPass() {
59   PassRegistration<SimpleParametricLoopTilingPass>();
60 }
61 } // namespace test
62 } // namespace mlir
63