66 lines
2.2 KiB
C++
66 lines
2.2 KiB
C++
//===- TestAffineLoopUnswitching.cpp - Test affine if/else hoisting -------===//
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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 pass to hoist affine if/else structures.
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//
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//===----------------------------------------------------------------------===//
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#include "mlir/Dialect/Affine/Analysis/Utils.h"
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#include "mlir/Dialect/Affine/IR/AffineOps.h"
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#include "mlir/Dialect/Affine/Utils.h"
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#include "mlir/Pass/Pass.h"
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#include "mlir/Transforms/Passes.h"
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#define PASS_NAME "test-affine-loop-unswitch"
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using namespace mlir;
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using namespace mlir::affine;
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namespace {
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/// This pass applies the permutation on the first maximal perfect nest.
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struct TestAffineLoopUnswitching
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: public PassWrapper<TestAffineLoopUnswitching, OperationPass<>> {
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MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID(TestAffineLoopUnswitching)
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StringRef getArgument() const final { return PASS_NAME; }
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StringRef getDescription() const final {
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return "Tests affine loop unswitching / if/else hoisting";
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}
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TestAffineLoopUnswitching() = default;
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TestAffineLoopUnswitching(const TestAffineLoopUnswitching &pass) = default;
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void runOnOperation() override;
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/// The maximum number of iterations to run this for.
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constexpr static unsigned kMaxIterations = 5;
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};
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} // namespace
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void TestAffineLoopUnswitching::runOnOperation() {
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// Each hoisting invalidates a lot of IR around. Just stop the walk after the
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// first if/else hoisting, and repeat until no more hoisting can be done, or
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// the maximum number of iterations have been run.
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Operation *op = getOperation();
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unsigned i = 0;
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do {
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auto walkFn = [](AffineIfOp op) {
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return succeeded(hoistAffineIfOp(op)) ? WalkResult::interrupt()
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: WalkResult::advance();
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};
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if (op->walk(walkFn).wasInterrupted())
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break;
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} while (++i < kMaxIterations);
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}
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namespace mlir {
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void registerTestAffineLoopUnswitchingPass() {
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PassRegistration<TestAffineLoopUnswitching>();
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}
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} // namespace mlir
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