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https://github.com/KhronosGroup/SPIRV-Tools
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c2013e248b
Currently it is impossible to invalidate the constnat and type manager. However, the compact ids pass changes the ids for the types and constants, which makes them invalid. This change will make them analyses that have to been explicitly marked as preserved by passes. This will allow compact ids to invalidate them. Fixes #2220.
108 lines
4.1 KiB
C++
108 lines
4.1 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 SOURCE_OPT_LOCAL_SINGLE_BLOCK_ELIM_PASS_H_
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#define SOURCE_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 <string>
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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 "source/opt/basic_block.h"
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#include "source/opt/def_use_manager.h"
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#include "source/opt/mem_pass.h"
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#include "source/opt/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() override;
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IRContext::Analysis GetPreservedAnalyses() override {
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return IRContext::kAnalysisDefUse |
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IRContext::kAnalysisInstrToBlockMapping |
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IRContext::kAnalysisConstants | IRContext::kAnalysisTypes;
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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(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();
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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, 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, 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 // SOURCE_OPT_LOCAL_SINGLE_BLOCK_ELIM_PASS_H_
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