2017-05-19 23:31:28 +00:00
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// 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_STORE_ELIM_PASS_H_
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#define LIBSPIRV_OPT_LOCAL_SINGLE_STORE_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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2017-07-27 19:30:12 +00:00
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#include "mem_pass.h"
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2017-11-08 17:40:02 +00:00
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#include "module.h"
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2017-05-19 23:31:28 +00:00
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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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2018-04-11 15:58:47 +00:00
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class LocalSingleStoreElimPass : public Pass {
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2017-05-19 23:31:28 +00:00
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using cbb_ptr = const ir::BasicBlock*;
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public:
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LocalSingleStoreElimPass();
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const char* name() const override { return "eliminate-local-single-store"; }
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2017-10-30 15:13:24 +00:00
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Status Process(ir::IRContext* irContext) override;
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2017-11-27 15:16:41 +00:00
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2017-11-09 16:24:41 +00:00
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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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2017-05-19 23:31:28 +00:00
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private:
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// Do "single-store" optimization of function variables defined only
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// with a single non-access-chain store in |func|. Replace all their
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// non-access-chain loads with the value that is stored and eliminate
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// any resulting dead code.
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bool LocalSingleStoreElim(ir::Function* func);
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2017-07-19 00:57:26 +00:00
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// Initialize extensions whitelist
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2018-04-11 15:58:47 +00:00
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void InitExtensionWhiteList();
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2017-07-19 00:57:26 +00:00
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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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2017-10-30 15:13:24 +00:00
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void Initialize(ir::IRContext* irContext);
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2017-05-19 23:31:28 +00:00
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Pass::Status ProcessImpl();
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2018-04-11 15:58:47 +00:00
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// If there is a single store to |var_inst|, and it covers the entire
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// variable, then replace all of the loads of the entire variable that are
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// dominated by the store by the value that was stored. Returns true if the
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// module was changed.
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bool ProcessVariable(ir::Instruction* var_inst);
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// Collects all of the uses of |var_inst| into |uses|. This looks through
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// OpObjectCopy's that copy the address of the variable, and collects those
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// uses as well.
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void FindUses(const ir::Instruction* var_inst,
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std::vector<ir::Instruction*>* uses) const;
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// Returns a store to |var_inst| if
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// - it is a store to the entire variable,
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// - and there are no other instructions that may modify |var_inst|.
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ir::Instruction* FindSingleStoreAndCheckUses(
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ir::Instruction* var_inst,
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const std::vector<ir::Instruction*>& users) const;
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// Returns true if the address that results from |inst| may be used as a base
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// address in a store instruction or may be used to compute the base address
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// of a store instruction.
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bool FeedsAStore(ir::Instruction* inst) const;
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// Replaces all of the loads in |uses| by the value stored in |store_inst|.
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// The load instructions are then killed.
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bool RewriteLoads(ir::Instruction* store_inst,
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const std::vector<ir::Instruction*>& uses);
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2017-05-19 23:31:28 +00:00
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2017-07-19 00:57:26 +00:00
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// Extensions supported by this pass.
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std::unordered_set<std::string> extensions_whitelist_;
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2017-05-19 23:31:28 +00:00
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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_STORE_ELIM_PASS_H_
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