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// Copyright (c) 2018 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/reduction_util.h"
#include "source/opt/ir_context.h"
namespace spvtools {
namespace reduce {
using namespace opt;
uint32_t FindOrCreateGlobalUndef(IRContext* context, uint32_t type_id) {
for (auto& inst : context->module()->types_values()) {
if (inst.opcode() != SpvOpUndef) {
continue;
}
if (inst.type_id() == type_id) {
return inst.result_id();
}
}
// TODO(2182): this is adapted from MemPass::Type2Undef. In due course it
// would be good to factor out this duplication.
const uint32_t undef_id = context->TakeNextId();
std::unique_ptr<Instruction> undef_inst(
new Instruction(context, SpvOpUndef, type_id, undef_id, {}));
assert(undef_id == undef_inst->result_id());
context->module()->AddGlobalValue(std::move(undef_inst));
return undef_id;
}
} // namespace reduce
} // namespace spvtools