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/*
* Copyright (c) 2018 Samsung Electronics Co., Ltd. All Rights Reserved
*
* 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 "IndirectCopyElimination.h"
#include <cassert>
namespace
{
coco::Copy *as_copy(coco::Instr *ins) { return ins ? ins->asCopy() : nullptr; }
/**
* @brief Return a set of copy instructions that are accessible from top-level module
*/
std::set<coco::Copy *> linked_copy_instrs(coco::Module *m)
{
std::set<coco::Copy *> res;
for (uint32_t n = 0; n < m->entity()->instr()->size(); ++n)
{
auto ins = m->entity()->instr()->at(n);
assert(ins != nullptr);
if (ins->parent() && ins->parent()->parent())
{
if (auto copy = ins->asCopy())
{
res.insert(copy);
}
}
}
return res;
}
} // namespace
namespace enco
{
void eliminate_indirect_copy(enco::Code *code)
{
auto m = code->module();
for (auto child : linked_copy_instrs(m))
{
auto from = child->from();
assert(from != nullptr);
// Find the irreducible origin
while (true)
{
if (auto producer = coco::producer(from))
{
if (auto parent = as_copy(producer->loc()))
{
assert(parent->from() != nullptr);
from = parent->from();
continue;
}
}
break;
}
child->from(from);
}
}
} // namespace enco
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