71 lines
2.3 KiB
C++
71 lines
2.3 KiB
C++
// Copyright (c) 2017 Google Inc.
|
|
//
|
|
// 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/opt/compact_ids_pass.h"
|
|
|
|
#include <cassert>
|
|
#include <unordered_map>
|
|
|
|
#include "source/opt/ir_context.h"
|
|
|
|
namespace spvtools {
|
|
namespace opt {
|
|
|
|
Pass::Status CompactIdsPass::Process() {
|
|
bool modified = false;
|
|
std::unordered_map<uint32_t, uint32_t> result_id_mapping;
|
|
|
|
context()->module()->ForEachInst(
|
|
[&result_id_mapping, &modified](Instruction* inst) {
|
|
auto operand = inst->begin();
|
|
while (operand != inst->end()) {
|
|
const auto type = operand->type;
|
|
if (spvIsIdType(type)) {
|
|
assert(operand->words.size() == 1);
|
|
uint32_t& id = operand->words[0];
|
|
auto it = result_id_mapping.find(id);
|
|
if (it == result_id_mapping.end()) {
|
|
const uint32_t new_id =
|
|
static_cast<uint32_t>(result_id_mapping.size()) + 1;
|
|
const auto insertion_result =
|
|
result_id_mapping.emplace(id, new_id);
|
|
it = insertion_result.first;
|
|
assert(insertion_result.second);
|
|
}
|
|
if (id != it->second) {
|
|
modified = true;
|
|
id = it->second;
|
|
// Update data cached in the instruction object.
|
|
if (type == SPV_OPERAND_TYPE_RESULT_ID) {
|
|
inst->SetResultId(id);
|
|
} else if (type == SPV_OPERAND_TYPE_TYPE_ID) {
|
|
inst->SetResultType(id);
|
|
}
|
|
}
|
|
}
|
|
++operand;
|
|
}
|
|
},
|
|
true);
|
|
|
|
if (modified)
|
|
context()->module()->SetIdBound(
|
|
static_cast<uint32_t>(result_id_mapping.size() + 1));
|
|
|
|
return modified ? Status::SuccessWithChange : Status::SuccessWithoutChange;
|
|
}
|
|
|
|
} // namespace opt
|
|
} // namespace spvtools
|