| 1 | //===- TestControlFlowSink.cpp - Test control-flow sink 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 pass tests the control-flow sink utilities by implementing an example |
| 10 | // control-flow sink pass. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
| 14 | #include "mlir/Dialect/Func/IR/FuncOps.h" |
| 15 | #include "mlir/IR/Dominance.h" |
| 16 | #include "mlir/Pass/Pass.h" |
| 17 | #include "mlir/Transforms/ControlFlowSinkUtils.h" |
| 18 | |
| 19 | using namespace mlir; |
| 20 | |
| 21 | namespace { |
| 22 | /// An example control-flow sink pass to test the control-flow sink utilites. |
| 23 | /// This pass will sink ops named `test.sink_me` and tag them with an attribute |
| 24 | /// `was_sunk` into the first region of `test.sink_target` ops. |
| 25 | struct TestControlFlowSinkPass |
| 26 | : public PassWrapper<TestControlFlowSinkPass, OperationPass<func::FuncOp>> { |
| 27 | MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID(TestControlFlowSinkPass) |
| 28 | |
| 29 | /// Get the command-line argument of the test pass. |
| 30 | StringRef getArgument() const final { return "test-control-flow-sink"; } |
| 31 | /// Get the description of the test pass. |
| 32 | StringRef getDescription() const final { |
| 33 | return "Test control-flow sink pass"; |
| 34 | } |
| 35 | |
| 36 | /// Runs the pass on the function. |
| 37 | void runOnOperation() override { |
| 38 | auto &domInfo = getAnalysis<DominanceInfo>(); |
| 39 | auto shouldMoveIntoRegion = [](Operation *op, Region *region) { |
| 40 | return region->getRegionNumber() == 0 && |
| 41 | op->getName().getStringRef() == "test.sink_me"; |
| 42 | }; |
| 43 | auto moveIntoRegion = [](Operation *op, Region *region) { |
| 44 | Block &entry = region->front(); |
| 45 | op->moveBefore(block: &entry, iterator: entry.begin()); |
| 46 | op->setAttr("was_sunk", |
| 47 | Builder(op).getI32IntegerAttr(region->getRegionNumber())); |
| 48 | }; |
| 49 | |
| 50 | getOperation()->walk([&](Operation *op) { |
| 51 | if (op->getName().getStringRef() != "test.sink_target") |
| 52 | return; |
| 53 | SmallVector<Region *> regions = |
| 54 | llvm::to_vector(Range: RegionRange(op->getRegions())); |
| 55 | controlFlowSink(regions, domInfo, shouldMoveIntoRegion, moveIntoRegion); |
| 56 | }); |
| 57 | } |
| 58 | }; |
| 59 | } // end anonymous namespace |
| 60 | |
| 61 | namespace mlir { |
| 62 | namespace test { |
| 63 | void registerTestControlFlowSink() { |
| 64 | PassRegistration<TestControlFlowSinkPass>(); |
| 65 | } |
| 66 | } // end namespace test |
| 67 | } // end namespace mlir |
| 68 |