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https://github.com/KhronosGroup/SPIRV-Tools
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c90d7305e7
These flags are expanded to a series of spirv-opt flags with the
following semantics:
-O: expands to passes that attempt to improve the performance of the
generated code.
-Os: expands to passes that attempt to reduce the size of the generated
code.
-Oconfig=<file> expands to the sequence of passes determined by the
flags specified in the user-provided file.
80 lines
2.3 KiB
C++
80 lines
2.3 KiB
C++
// Copyright (c) 2017 The Khronos Group Inc.
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// Copyright (c) 2017 Valve Corporation
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// Copyright (c) 2017 LunarG 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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#ifndef LIBSPIRV_OPT_BLOCK_MERGE_PASS_H_
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#define LIBSPIRV_OPT_BLOCK_MERGE_PASS_H_
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#include <algorithm>
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#include <map>
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#include <queue>
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#include <unordered_map>
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#include <unordered_set>
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#include <utility>
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#include "basic_block.h"
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#include "def_use_manager.h"
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#include "module.h"
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#include "pass.h"
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namespace spvtools {
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namespace opt {
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// See optimizer.hpp for documentation.
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class BlockMergePass : public Pass {
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public:
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BlockMergePass();
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const char* name() const override { return "merge-blocks"; }
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Status Process(ir::Module*) override;
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private:
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// Return true if |block_ptr| is loop header block
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bool IsLoopHeader(ir::BasicBlock* block_ptr);
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// Return true if |labId| has multiple refs. Do not count OpName.
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bool HasMultipleRefs(uint32_t labId);
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// Kill any OpName instruction referencing |inst|, then kill |inst|.
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void KillInstAndName(ir::Instruction* inst);
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// Search |func| for blocks which have a single Branch to a block
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// with no other predecessors. Merge these blocks into a single block.
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bool MergeBlocks(ir::Function* func);
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// Initialize extensions whitelist
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void InitExtensions();
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// Return true if all extensions in this module are allowed by this pass.
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bool AllExtensionsSupported() const;
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void Initialize(ir::Module* module);
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Pass::Status ProcessImpl();
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// Module this pass is processing
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ir::Module* module_;
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// Def-Uses for the module we are processing
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std::unique_ptr<analysis::DefUseManager> def_use_mgr_;
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// Extensions supported by this pass.
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std::unordered_set<std::string> extensions_whitelist_;
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};
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} // namespace opt
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} // namespace spvtools
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#endif // LIBSPIRV_OPT_BLOCK_MERGE_PASS_H_
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