87 lines
2.6 KiB
C++
87 lines
2.6 KiB
C++
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// 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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#include <algorithm>
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#include "reduction_pass.h"
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#include "source/opt/build_module.h"
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namespace spvtools {
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namespace reduce {
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std::vector<uint32_t> ReductionPass::TryApplyReduction(
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const std::vector<uint32_t>& binary) {
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// We represent modules as binaries because (a) attempts at reduction need to
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// end up in binary form to be passed on to SPIR-V-consuming tools, and (b)
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// when we apply a reduction step we need to do it on a fresh version of the
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// module as if the reduction step proves to be uninteresting we need to
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// backtrack; re-parsing from binary provides a very clean way of cloning the
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// module.
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std::unique_ptr<opt::IRContext> context =
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BuildModule(target_env_, consumer_, binary.data(), binary.size());
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assert(context);
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std::vector<std::unique_ptr<ReductionOpportunity>> opportunities =
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GetAvailableOpportunities(context.get());
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if (!is_initialized_) {
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is_initialized_ = true;
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index_ = 0;
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granularity_ = (uint32_t)opportunities.size();
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}
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if (opportunities.empty()) {
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granularity_ = 1;
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return std::vector<uint32_t>();
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}
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assert(granularity_ > 0);
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if (index_ >= opportunities.size()) {
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index_ = 0;
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granularity_ = std::max((uint32_t)1, granularity_ / 2);
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return std::vector<uint32_t>();
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}
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for (uint32_t i = index_;
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i < std::min(index_ + granularity_, (uint32_t)opportunities.size());
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++i) {
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opportunities[i]->TryToApply();
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}
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index_ += granularity_;
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std::vector<uint32_t> result;
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context->module()->ToBinary(&result, false);
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return result;
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}
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void ReductionPass::SetMessageConsumer(MessageConsumer consumer) {
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consumer_ = std::move(consumer);
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}
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bool ReductionPass::ReachedMinimumGranularity() const {
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if (!is_initialized_) {
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// Conceptually we can think that if the pass has not yet been initialized,
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// it is operating at unbounded granularity.
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return false;
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}
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assert(granularity_ != 0);
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return granularity_ == 1;
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}
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} // namespace reduce
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} // namespace spvtools
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