mirror of
https://github.com/KhronosGroup/SPIRV-Tools
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61 lines
2.1 KiB
C++
61 lines
2.1 KiB
C++
// Copyright (c) 2018 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 "remove_unreferenced_instruction_reduction_pass.h"
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#include "remove_instruction_reduction_opportunity.h"
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#include "source/opcode.h"
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#include "source/opt/instruction.h"
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namespace spvtools {
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namespace reduce {
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using namespace opt;
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std::vector<std::unique_ptr<ReductionOpportunity>>
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RemoveUnreferencedInstructionReductionPass::GetAvailableOpportunities(
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opt::IRContext* context) const {
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std::vector<std::unique_ptr<ReductionOpportunity>> result;
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for (auto& function : *context->module()) {
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for (auto& block : function) {
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for (auto& inst : block) {
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if (context->get_def_use_mgr()->NumUses(&inst) > 0) {
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continue;
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}
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if (spvOpcodeIsBlockTerminator(inst.opcode()) ||
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inst.opcode() == SpvOpSelectionMerge ||
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inst.opcode() == SpvOpLoopMerge) {
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// In this reduction pass we do not want to affect static control
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// flow.
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continue;
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}
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// Given that we're in a block, we should only get here if the
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// instruction is not directly related to control flow; i.e., it's
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// some straightforward instruction with an unused result, like an
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// arithmetic operation or function call.
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result.push_back(
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MakeUnique<RemoveInstructionReductionOpportunity>(&inst));
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}
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}
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}
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return result;
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}
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std::string RemoveUnreferencedInstructionReductionPass::GetName() const {
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return "RemoveUnreferencedInstructionReductionPass";
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}
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} // namespace reduce
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} // namespace spvtools
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