| 1 | //===- FormExpressions.cpp - Form C-style expressions --------*- C++ -*-===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file implements a pass that forms EmitC operations modeling C operators |
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| 10 | // into C-style expressions using the emitc.expression op. |
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| 11 | // |
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| 12 | //===----------------------------------------------------------------------===// |
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| 13 | |
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| 14 | #include "mlir/Dialect/EmitC/IR/EmitC.h" |
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| 15 | #include "mlir/Dialect/EmitC/Transforms/Passes.h" |
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| 16 | #include "mlir/Dialect/EmitC/Transforms/Transforms.h" |
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| 17 | #include "mlir/Transforms/GreedyPatternRewriteDriver.h" |
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| 18 | |
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| 19 | namespace mlir { |
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| 20 | namespace emitc { |
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| 21 | #define GEN_PASS_DEF_FORMEXPRESSIONSPASS |
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| 22 | #include "mlir/Dialect/EmitC/Transforms/Passes.h.inc" |
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| 23 | } // namespace emitc |
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| 24 | } // namespace mlir |
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| 25 | |
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| 26 | using namespace mlir; |
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| 27 | using namespace emitc; |
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| 28 | |
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| 29 | namespace { |
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| 30 | struct FormExpressionsPass |
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| 31 | : public emitc::impl::FormExpressionsPassBase<FormExpressionsPass> { |
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| 32 | void runOnOperation() override { |
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| 33 | Operation *rootOp = getOperation(); |
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| 34 | MLIRContext *context = rootOp->getContext(); |
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| 35 | |
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| 36 | // Wrap each C operator op with an expression op. |
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| 37 | OpBuilder builder(context); |
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| 38 | auto matchFun = [&](Operation *op) { |
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| 39 | if (op->hasTrait<OpTrait::emitc::CExpression>() && |
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| 40 | !op->getParentOfType<emitc::ExpressionOp>() && |
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| 41 | op->getNumResults() == 1) |
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| 42 | createExpression(op, builder); |
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| 43 | }; |
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| 44 | rootOp->walk(matchFun); |
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| 45 | |
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| 46 | // Fold expressions where possible. |
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| 47 | RewritePatternSet patterns(context); |
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| 48 | populateExpressionPatterns(patterns); |
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| 49 | |
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| 50 | if (failed(applyPatternsGreedily(rootOp, std::move(patterns)))) |
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| 51 | return signalPassFailure(); |
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| 52 | } |
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| 53 | |
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| 54 | void getDependentDialects(DialectRegistry ®istry) const override { |
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| 55 | registry.insert<emitc::EmitCDialect>(); |
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| 56 | } |
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| 57 | }; |
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| 58 | } // namespace |
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| 59 | |
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