mirror of
https://github.com/KhronosGroup/SPIRV-Tools
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58 lines
1.8 KiB
C++
58 lines
1.8 KiB
C++
// Copyright (c) 2017 Google Inc.
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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 "compact_ids_pass.h"
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#include <cassert>
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#include <unordered_map>
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namespace spvtools {
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namespace opt {
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using ir::Instruction;
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using ir::Operand;
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Pass::Status CompactIdsPass::Process(ir::Module* module) {
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bool modified = false;
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std::unordered_map<uint32_t, uint32_t> result_id_mapping;
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module->ForEachInst([&result_id_mapping, &modified] (Instruction* inst) {
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auto operand = inst->begin();
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while (operand != inst->end()) {
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if (spvIsIdType(operand->type)) {
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assert(operand->words.size() == 1);
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uint32_t& id = operand->words[0];
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auto it = result_id_mapping.find(id);
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if (it == result_id_mapping.end()) {
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const uint32_t new_id =
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static_cast<uint32_t>(result_id_mapping.size()) + 1;
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const auto insertion_result = result_id_mapping.emplace(id, new_id);
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it = insertion_result.first;
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assert(insertion_result.second);
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}
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if (id != it->second) {
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modified = true;
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id = it->second;
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}
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}
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++operand;
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}
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}, true);
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return modified ? Status::SuccessWithChange : Status::SuccessWithoutChange;
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}
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} // namespace opt
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} // namespace spvtools
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