SPIRV-Tools/source/reduce/remove_function_reduction_opportunity_finder.cpp
Alastair Donaldson 5dcb576b69
spirv-reduce: Support reducing a specific function (#3774)
Motivated by integrating spirv-reduce into spirv-fuzz, so that an
added function can be made smaller during shrinking, this adds support
in spirv-reduce for asking reduction to be restricted to the
instructions of a single specified function.
2020-09-11 06:29:43 +01:00

51 lines
1.7 KiB
C++

// Copyright (c) 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "source/reduce/remove_function_reduction_opportunity_finder.h"
#include "source/reduce/remove_function_reduction_opportunity.h"
namespace spvtools {
namespace reduce {
std::vector<std::unique_ptr<ReductionOpportunity>>
RemoveFunctionReductionOpportunityFinder::GetAvailableOpportunities(
opt::IRContext* context, uint32_t target_function) const {
if (target_function) {
// If we are targeting a specific function then we are only interested in
// opportunities that simplify the internals of that function; removing
// whole functions does not fit the bill.
return {};
}
std::vector<std::unique_ptr<ReductionOpportunity>> result;
// Consider each function.
for (auto& function : *context->module()) {
if (context->get_def_use_mgr()->NumUses(function.result_id()) > 0) {
// If the function is referenced, ignore it.
continue;
}
result.push_back(
MakeUnique<RemoveFunctionReductionOpportunity>(context, &function));
}
return result;
}
std::string RemoveFunctionReductionOpportunityFinder::GetName() const {
return "RemoveFunctionReductionOpportunityFinder";
}
} // namespace reduce
} // namespace spvtools