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https://github.com/KhronosGroup/SPIRV-Tools
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efe12ff5a1
Originally the passes that extended from MemPass were those that are of the def-use manager. I am assuming they would be able to preserve it because of that. Added a check to verify consistency of the IRContext. The IRContext relies on the pass to tell it if something is invalidated. It is possible that the pass lied. To help identify those situations, we will check if the valid analyses are correct after each pass. This will be enabled by default for the debug build, and disabled in the production build. It can be disabled in the debug build by adding "-DSPIRV_CHECK_CONTEXT=OFF" to the cmake command.
104 lines
4.0 KiB
C++
104 lines
4.0 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_LOCAL_SINGLE_BLOCK_ELIM_PASS_H_
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#define LIBSPIRV_OPT_LOCAL_SINGLE_BLOCK_ELIM_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 "mem_pass.h"
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#include "module.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 LocalSingleBlockLoadStoreElimPass : public MemPass {
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public:
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LocalSingleBlockLoadStoreElimPass();
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const char* name() const override { return "eliminate-local-single-block"; }
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Status Process(ir::IRContext* c) override;
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ir::IRContext::Analysis GetPreservedAnalyses() override {
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return ir::IRContext::kAnalysisDefUse;
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}
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private:
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// Return true if all uses of |varId| are only through supported reference
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// operations ie. loads and store. Also cache in supported_ref_ptrs_.
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// TODO(dnovillo): This function is replicated in other passes and it's
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// slightly different in every pass. Is it possible to make one common
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// implementation?
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bool HasOnlySupportedRefs(uint32_t varId);
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// On all entry point functions, within each basic block, eliminate
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// loads and stores to function variables where possible. For
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// loads, if previous load or store to same variable, replace
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// load id with previous id and delete load. Finally, check if
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// remaining stores are useless, and delete store and variable
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// where possible. Assumes logical addressing.
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bool LocalSingleBlockLoadStoreElim(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 supported by this pass.
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bool AllExtensionsSupported() const;
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void Initialize(ir::IRContext* c);
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Pass::Status ProcessImpl();
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// Map from function scope variable to a store of that variable in the
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// current block whose value is currently valid. This map is cleared
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// at the start of each block and incrementally updated as the block
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// is scanned. The stores are candidates for elimination. The map is
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// conservatively cleared when a function call is encountered.
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std::unordered_map<uint32_t, ir::Instruction*> var2store_;
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// Map from function scope variable to a load of that variable in the
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// current block whose value is currently valid. This map is cleared
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// at the start of each block and incrementally updated as the block
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// is scanned. The stores are candidates for elimination. The map is
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// conservatively cleared when a function call is encountered.
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std::unordered_map<uint32_t, ir::Instruction*> var2load_;
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// Set of variables whose most recent store in the current block cannot be
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// deleted, for example, if there is a load of the variable which is
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// dependent on the store and is not replaced and deleted by this pass,
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// for example, a load through an access chain. A variable is removed
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// from this set each time a new store of that variable is encountered.
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std::unordered_set<uint32_t> pinned_vars_;
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// Extensions supported by this pass.
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std::unordered_set<std::string> extensions_whitelist_;
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// Variables that are only referenced by supported operations for this
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// pass ie. loads and stores.
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std::unordered_set<uint32_t> supported_ref_ptrs_;
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};
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} // namespace opt
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} // namespace spvtools
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#endif // LIBSPIRV_OPT_LOCAL_SINGLE_BLOCK_ELIM_PASS_H_
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