97 lines
3.3 KiB
C++
97 lines
3.3 KiB
C++
//===- OpenACCToSCF.cpp - OpenACC condition to SCF if conversion ----------===//
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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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#include "mlir/Conversion/OpenACCToSCF/ConvertOpenACCToSCF.h"
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#include "mlir/Dialect/Arith/IR/Arith.h"
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#include "mlir/Dialect/OpenACC/OpenACC.h"
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#include "mlir/Dialect/SCF/IR/SCF.h"
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#include "mlir/Pass/Pass.h"
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#include "mlir/Transforms/DialectConversion.h"
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namespace mlir {
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#define GEN_PASS_DEF_CONVERTOPENACCTOSCF
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#include "mlir/Conversion/Passes.h.inc"
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} // namespace mlir
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using namespace mlir;
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//===----------------------------------------------------------------------===//
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// Conversion patterns
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//===----------------------------------------------------------------------===//
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namespace {
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/// Pattern to transform the `getIfCond` on operation without region into a
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/// scf.if and move the operation into the `then` region.
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template <typename OpTy>
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class ExpandIfCondition : public OpRewritePattern<OpTy> {
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using OpRewritePattern<OpTy>::OpRewritePattern;
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LogicalResult matchAndRewrite(OpTy op,
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PatternRewriter &rewriter) const override {
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// Early exit if there is no condition.
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if (!op.getIfCond())
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return success();
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// Condition is not a constant.
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if (!op.getIfCond().template getDefiningOp<arith::ConstantOp>()) {
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auto ifOp = rewriter.create<scf::IfOp>(op.getLoc(), TypeRange(),
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op.getIfCond(), false);
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rewriter.updateRootInPlace(op, [&]() { op.getIfCondMutable().erase(0); });
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auto thenBodyBuilder = ifOp.getThenBodyBuilder();
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thenBodyBuilder.setListener(rewriter.getListener());
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thenBodyBuilder.clone(*op.getOperation());
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rewriter.eraseOp(op);
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}
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return success();
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}
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};
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} // namespace
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void mlir::populateOpenACCToSCFConversionPatterns(RewritePatternSet &patterns) {
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patterns.add<ExpandIfCondition<acc::EnterDataOp>>(patterns.getContext());
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patterns.add<ExpandIfCondition<acc::ExitDataOp>>(patterns.getContext());
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patterns.add<ExpandIfCondition<acc::UpdateOp>>(patterns.getContext());
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}
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namespace {
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struct ConvertOpenACCToSCFPass
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: public impl::ConvertOpenACCToSCFBase<ConvertOpenACCToSCFPass> {
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void runOnOperation() override;
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};
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} // namespace
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void ConvertOpenACCToSCFPass::runOnOperation() {
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auto op = getOperation();
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auto *context = op.getContext();
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RewritePatternSet patterns(context);
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ConversionTarget target(*context);
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populateOpenACCToSCFConversionPatterns(patterns);
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target.addLegalDialect<scf::SCFDialect>();
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target.addLegalDialect<acc::OpenACCDialect>();
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target.addDynamicallyLegalOp<acc::EnterDataOp>(
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[](acc::EnterDataOp op) { return !op.getIfCond(); });
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target.addDynamicallyLegalOp<acc::ExitDataOp>(
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[](acc::ExitDataOp op) { return !op.getIfCond(); });
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target.addDynamicallyLegalOp<acc::UpdateOp>(
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[](acc::UpdateOp op) { return !op.getIfCond(); });
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if (failed(applyPartialConversion(op, target, std::move(patterns))))
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signalPassFailure();
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}
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std::unique_ptr<OperationPass<ModuleOp>> mlir::createConvertOpenACCToSCFPass() {
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return std::make_unique<ConvertOpenACCToSCFPass>();
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}
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