74687180dd
By defining `CExpressionInterface`, we move the side effect detection logic from `emitc.expression` into the individual operations implementing the interface allowing operations to gradually tune the side effect. It also allows checking for side effects each operation individually.
59 lines
1.9 KiB
C++
59 lines
1.9 KiB
C++
//===- FormExpressions.cpp - Form C-style expressions --------*- C++ -*-===//
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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 that forms EmitC operations modeling C operators
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// into C-style expressions using the emitc.expression op.
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//
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//===----------------------------------------------------------------------===//
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#include "mlir/Dialect/EmitC/IR/EmitC.h"
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#include "mlir/Dialect/EmitC/Transforms/Passes.h"
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#include "mlir/Dialect/EmitC/Transforms/Transforms.h"
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#include "mlir/Transforms/GreedyPatternRewriteDriver.h"
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namespace mlir {
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namespace emitc {
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#define GEN_PASS_DEF_FORMEXPRESSIONSPASS
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#include "mlir/Dialect/EmitC/Transforms/Passes.h.inc"
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} // namespace emitc
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} // namespace mlir
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using namespace mlir;
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using namespace emitc;
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namespace {
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struct FormExpressionsPass
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: public emitc::impl::FormExpressionsPassBase<FormExpressionsPass> {
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void runOnOperation() override {
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Operation *rootOp = getOperation();
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MLIRContext *context = rootOp->getContext();
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// Wrap each C operator op with an expression op.
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OpBuilder builder(context);
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auto matchFun = [&](Operation *op) {
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if (isa<emitc::CExpressionInterface>(*op) &&
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!op->getParentOfType<emitc::ExpressionOp>() &&
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op->getNumResults() == 1)
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createExpression(op, builder);
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};
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rootOp->walk(matchFun);
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// Fold expressions where possible.
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RewritePatternSet patterns(context);
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populateExpressionPatterns(patterns);
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if (failed(applyPatternsGreedily(rootOp, std::move(patterns))))
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return signalPassFailure();
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}
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void getDependentDialects(DialectRegistry ®istry) const override {
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registry.insert<emitc::EmitCDialect>();
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}
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};
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} // namespace
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