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/IR/Builders.h"
15 #include "mlir/Pass/Pass.h"
16 #include "mlir/Transforms/LoopUtils.h"
17 #include "mlir/Transforms/Passes.h"
18 
19 using namespace mlir;
20 
21 namespace {
22 
23 // Extracts fixed-range loops for top-level loop nests with ranges defined in
24 // the pass constructor.  Assumes loops are permutable.
25 class SimpleParametricLoopTilingPass
26     : public PassWrapper<SimpleParametricLoopTilingPass, FunctionPass> {
27 public:
28   SimpleParametricLoopTilingPass() = default;
SimpleParametricLoopTilingPass(const SimpleParametricLoopTilingPass &)29   SimpleParametricLoopTilingPass(const SimpleParametricLoopTilingPass &) {}
SimpleParametricLoopTilingPass(ArrayRef<int64_t> outerLoopSizes)30   explicit SimpleParametricLoopTilingPass(ArrayRef<int64_t> outerLoopSizes) {
31     sizes = outerLoopSizes;
32   }
33 
runOnFunction()34   void runOnFunction() override {
35     FuncOp func = getFunction();
36     func.walk([this](scf::ForOp op) {
37       // Ignore nested loops.
38       if (op->getParentRegion()->getParentOfType<scf::ForOp>())
39         return;
40       extractFixedOuterLoops(op, sizes);
41     });
42   }
43 
44   ListOption<int64_t> sizes{
45       *this, "test-outer-loop-sizes", llvm::cl::MiscFlags::CommaSeparated,
46       llvm::cl::desc(
47           "fixed number of iterations that the outer loops should have")};
48 };
49 } // namespace
50 
51 namespace mlir {
52 namespace test {
registerSimpleParametricTilingPass()53 void registerSimpleParametricTilingPass() {
54   PassRegistration<SimpleParametricLoopTilingPass>(
55       "test-extract-fixed-outer-loops",
56       "test application of parametric tiling to the outer loops so that the "
57       "ranges of outer loops become static");
58 }
59 } // namespace test
60 } // namespace mlir
61