mirror of
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71 lines
2.5 KiB
C++
71 lines
2.5 KiB
C++
/*
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* The MIT License (MIT)
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*
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* Copyright (c) 2015-2024 Advanced Micro Devices, Inc. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <migraphx/eliminate_identity.hpp>
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#include <migraphx/program.hpp>
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#include <migraphx/instruction.hpp>
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#include <migraphx/iterator_for.hpp>
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#include <migraphx/stringutils.hpp>
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#include <utility>
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namespace migraphx {
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inline namespace MIGRAPHX_INLINE_NS {
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void eliminate_identity::apply(module& m) const
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{
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auto last = std::prev(m.end());
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for(auto ins : iterator_for(m))
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{
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// Skip the first instruction, since we always process the previous
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// instruction
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if(ins == m.begin())
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continue;
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const auto i = std::prev(ins);
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if(i->name() == "identity")
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{
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m.replace_instruction(i, i->inputs().front());
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m.move_instruction(i, m.end());
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}
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if(ins == last)
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{
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if(ins->name() == "identity")
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{
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const instruction_ref& identity_input = ins->inputs().front();
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if(identity_input->outputs().size() == 1)
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{
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m.move_instruction(identity_input, last);
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// since this is the last instruction, removing it only
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// requires changing "last" and calling remove below
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last = std::prev(last);
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}
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}
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break;
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}
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}
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m.remove_instructions(std::next(last), m.end());
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}
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} // namespace MIGRAPHX_INLINE_NS
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} // namespace migraphx
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