82 lines
3.2 KiB
C++
82 lines
3.2 KiB
C++
// Copyright (c) 2018 Google LLC
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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 SOURCE_REDUCE_REDUCTION_PASS_H_
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#define SOURCE_REDUCE_REDUCTION_PASS_H_
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#include <limits>
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#include "source/opt/ir_context.h"
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#include "source/reduce/reduction_opportunity_finder.h"
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#include "spirv-tools/libspirv.hpp"
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namespace spvtools {
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namespace reduce {
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// Abstract class representing a reduction pass, which can be repeatedly
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// invoked to find and apply particular reduction opportunities to a SPIR-V
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// binary. In the spirit of delta debugging, a pass initially tries to apply
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// large chunks of reduction opportunities, iterating through available
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// opportunities at a given granularity. When an iteration over available
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// opportunities completes, the granularity is reduced and iteration starts
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// again, until the minimum granularity is reached.
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class ReductionPass {
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public:
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// Constructs a reduction pass with a given target environment, |target_env|,
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// and a given finder of reduction opportunities, |finder|.
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explicit ReductionPass(const spv_target_env target_env,
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std::unique_ptr<ReductionOpportunityFinder> finder)
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: target_env_(target_env),
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finder_(std::move(finder)),
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index_(0),
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granularity_(std::numeric_limits<uint32_t>::max()) {}
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// Applies the reduction pass to the given binary by applying a "chunk" of
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// reduction opportunities. Returns the new binary if a chunk was applied; in
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// this case, before the next call the caller must invoke
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// NotifyInteresting(...) to indicate whether the new binary is interesting.
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// Returns an empty vector if there are no more chunks left to apply; in this
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// case, the index will be reset and the granularity lowered for the next
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// round.
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std::vector<uint32_t> TryApplyReduction(const std::vector<uint32_t>& binary);
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// Notifies the reduction pass whether the binary returned from
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// TryApplyReduction is interesting, so that the next call to
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// TryApplyReduction will avoid applying the same chunk of opportunities.
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void NotifyInteresting(bool interesting);
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// Sets a consumer to which relevant messages will be directed.
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void SetMessageConsumer(MessageConsumer consumer);
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// Returns true if the granularity with which reduction opportunities are
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// applied has reached a minimum.
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bool ReachedMinimumGranularity() const;
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// Returns the name associated with this reduction pass (based on its
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// associated finder).
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std::string GetName() const;
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private:
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const spv_target_env target_env_;
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const std::unique_ptr<ReductionOpportunityFinder> finder_;
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MessageConsumer consumer_;
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uint32_t index_;
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uint32_t granularity_;
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};
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} // namespace reduce
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} // namespace spvtools
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#endif // SOURCE_REDUCE_REDUCTION_PASS_H_
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