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12d54d746e
Transforms are supposed to be immutable, operating on the DataMaps provided for input and output, so make the methods const. Add a ShouldRun() method which the Manager can use to skip over transforms that do not need to be run. Change-Id: I320ac964577e94ac988748d8aca85bd43ee8d3b5 Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/77120 Kokoro: Kokoro <noreply+kokoro@google.com> Reviewed-by: Antonio Maiorano <amaiorano@google.com> Commit-Queue: Ben Clayton <bclayton@google.com>
62 lines
2.2 KiB
C++
62 lines
2.2 KiB
C++
// Copyright 2021 The Tint Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef SRC_TRANSFORM_FOLD_TRIVIAL_SINGLE_USE_LETS_H_
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#define SRC_TRANSFORM_FOLD_TRIVIAL_SINGLE_USE_LETS_H_
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#include <string>
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#include <unordered_map>
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#include "src/transform/transform.h"
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namespace tint {
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namespace transform {
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/// FoldTrivialSingleUseLets is an optimizer for folding away trivial `let`
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/// statements into their single place of use. This transform is intended to
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/// clean up the SSA `let`s produced by the SPIR-V reader.
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/// `let`s can only be folded if:
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/// * There is a single usage of the `let` value.
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/// * The `let` is constructed with a ScalarConstructorExpression, or with an
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/// IdentifierExpression.
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/// * There are only other foldable `let`s between the `let` declaration and its
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/// single usage.
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/// These rules prevent any hoisting of the let that may affect execution
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/// behaviour.
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class FoldTrivialSingleUseLets
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: public Castable<FoldTrivialSingleUseLets, Transform> {
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public:
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/// Constructor
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FoldTrivialSingleUseLets();
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/// Destructor
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~FoldTrivialSingleUseLets() override;
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protected:
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/// Runs the transform using the CloneContext built for transforming a
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/// program. Run() is responsible for calling Clone() on the CloneContext.
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/// @param ctx the CloneContext primed with the input program and
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/// ProgramBuilder
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/// @param inputs optional extra transform-specific input data
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/// @param outputs optional extra transform-specific output data
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void Run(CloneContext& ctx,
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const DataMap& inputs,
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DataMap& outputs) const override;
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};
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} // namespace transform
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} // namespace tint
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#endif // SRC_TRANSFORM_FOLD_TRIVIAL_SINGLE_USE_LETS_H_
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