67d0d7ac0a
The patch introduces the required changes to update the pass declarations and definitions to use the new autogenerated files and allow dropping the old infrastructure. Reviewed By: mehdi_amini, rriddle Differential Review: https://reviews.llvm.org/D132838
60 lines
2.2 KiB
C++
60 lines
2.2 KiB
C++
//===- ControlFlowSink.cpp - Code to perform control-flow sinking ---------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements a basic control-flow sink pass. Control-flow sinking
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// moves operations whose only uses are in conditionally-executed blocks in to
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// those blocks so that they aren't executed on paths where their results are
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// not needed.
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//
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//===----------------------------------------------------------------------===//
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#include "mlir/Transforms/Passes.h"
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#include "mlir/IR/Dominance.h"
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#include "mlir/Interfaces/ControlFlowInterfaces.h"
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#include "mlir/Interfaces/SideEffectInterfaces.h"
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#include "mlir/Transforms/ControlFlowSinkUtils.h"
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#include "mlir/Transforms/SideEffectUtils.h"
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namespace mlir {
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#define GEN_PASS_DEF_CONTROLFLOWSINK
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#include "mlir/Transforms/Passes.h.inc"
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} // namespace mlir
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using namespace mlir;
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namespace {
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/// A control-flow sink pass.
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struct ControlFlowSink : public impl::ControlFlowSinkBase<ControlFlowSink> {
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void runOnOperation() override;
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};
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} // end anonymous namespace
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void ControlFlowSink::runOnOperation() {
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auto &domInfo = getAnalysis<DominanceInfo>();
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getOperation()->walk([&](RegionBranchOpInterface branch) {
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SmallVector<Region *> regionsToSink;
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// Get the regions are that known to be executed at most once.
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getSinglyExecutedRegionsToSink(branch, regionsToSink);
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// Sink side-effect free operations.
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numSunk = controlFlowSink(
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regionsToSink, domInfo,
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[](Operation *op, Region *) { return isSideEffectFree(op); },
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[](Operation *op, Region *region) {
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// Move the operation to the beginning of the region's entry block.
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// This guarantees the preservation of SSA dominance of all of the
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// operation's uses are in the region.
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op->moveBefore(®ion->front(), region->front().begin());
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});
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});
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}
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std::unique_ptr<Pass> mlir::createControlFlowSinkPass() {
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return std::make_unique<ControlFlowSink>();
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}
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