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//===- OpenACCToSCF.cpp - OpenACC condition to SCF if conversion ----------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "../PassDetail.h"
#include "mlir/Conversion/OpenACCToSCF/ConvertOpenACCToSCF.h"
#include "mlir/Dialect/Arithmetic/IR/Arithmetic.h"
#include "mlir/Dialect/OpenACC/OpenACC.h"
#include "mlir/Dialect/SCF/IR/SCF.h"
#include "mlir/Transforms/DialectConversion.h"
using namespace mlir;
//===----------------------------------------------------------------------===//
// Conversion patterns
//===----------------------------------------------------------------------===//
namespace {
/// Pattern to transform the `ifCond` on operation without region into a scf.if
/// and move the operation into the `then` region.
template <typename OpTy>
class ExpandIfCondition : public OpRewritePattern<OpTy> {
using OpRewritePattern<OpTy>::OpRewritePattern;
LogicalResult matchAndRewrite(OpTy op,
PatternRewriter &rewriter) const override {
// Early exit if there is no condition.
if (!op.ifCond())
return success();
// Condition is not a constant.
if (!op.ifCond().template getDefiningOp<arith::ConstantOp>()) {
auto ifOp = rewriter.create<scf::IfOp>(op.getLoc(), TypeRange(),
op.ifCond(), false);
rewriter.updateRootInPlace(op, [&]() { op.ifCondMutable().erase(0); });
auto thenBodyBuilder = ifOp.getThenBodyBuilder();
thenBodyBuilder.setListener(rewriter.getListener());
thenBodyBuilder.clone(*op.getOperation());
rewriter.eraseOp(op);
}
return success();
}
};
} // namespace
void mlir::populateOpenACCToSCFConversionPatterns(RewritePatternSet &patterns) {
patterns.add<ExpandIfCondition<acc::EnterDataOp>>(patterns.getContext());
patterns.add<ExpandIfCondition<acc::ExitDataOp>>(patterns.getContext());
patterns.add<ExpandIfCondition<acc::UpdateOp>>(patterns.getContext());
}
namespace {
struct ConvertOpenACCToSCFPass
: public ConvertOpenACCToSCFBase<ConvertOpenACCToSCFPass> {
void runOnOperation() override;
};
} // namespace
void ConvertOpenACCToSCFPass::runOnOperation() {
auto op = getOperation();
auto *context = op.getContext();
RewritePatternSet patterns(context);
ConversionTarget target(*context);
populateOpenACCToSCFConversionPatterns(patterns);
target.addLegalDialect<scf::SCFDialect>();
target.addLegalDialect<acc::OpenACCDialect>();
target.addDynamicallyLegalOp<acc::EnterDataOp>(
[](acc::EnterDataOp op) { return !op.ifCond(); });
target.addDynamicallyLegalOp<acc::ExitDataOp>(
[](acc::ExitDataOp op) { return !op.ifCond(); });
target.addDynamicallyLegalOp<acc::UpdateOp>(
[](acc::UpdateOp op) { return !op.ifCond(); });
if (failed(applyPartialConversion(op, target, std::move(patterns))))
signalPassFailure();
}
std::unique_ptr<OperationPass<ModuleOp>> mlir::createConvertOpenACCToSCFPass() {
return std::make_unique<ConvertOpenACCToSCFPass>();
}
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