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https://github.com/KhronosGroup/SPIRV-Tools
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0e9f2f948a
Adding a map from an id to it set of OpName and OpMemberName instructions. This will be used in KillNameAndDecorates to kill the names for the ids that are being removed. In my test, the compile time for 50 shaders went from 1m57s to 55s. This was on linux using the release build. Fixes #1290.
66 lines
2.6 KiB
C++
66 lines
2.6 KiB
C++
// Copyright (c) 2017 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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#ifndef LIBSPIRV_OPT_LOCAL_REDUNDANCY_ELIMINATION_H_
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#define LIBSPIRV_OPT_LOCAL_REDUNDANCY_ELIMINATION_H_
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#include "ir_context.h"
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#include "pass.h"
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#include "value_number_table.h"
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namespace spvtools {
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namespace opt {
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// This pass implements local redundancy elimination. Its goal is to reduce the
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// number of times the same value is computed. It works on each basic block
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// independently, ie local. For each instruction in a basic block, it gets the
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// value number for the result id, |id|, of the instruction. If that value
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// number has already been computed in the basic block, it tries to replace the
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// uses of |id| by the id that already contains the same value. Then the
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// current instruction is deleted.
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class LocalRedundancyEliminationPass : public Pass {
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public:
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const char* name() const override { return "local-redundancy-elimination"; }
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Status Process(ir::IRContext*) override;
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virtual ir::IRContext::Analysis GetPreservedAnalyses() override {
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return ir::IRContext::kAnalysisDefUse |
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ir::IRContext::kAnalysisInstrToBlockMapping |
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ir::IRContext::kAnalysisDecorations |
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ir::IRContext::kAnalysisCombinators | ir::IRContext::kAnalysisCFG |
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ir::IRContext::kAnalysisDominatorAnalysis |
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ir::IRContext::kAnalysisNameMap;
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}
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protected:
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// Deletes instructions in |block| whose value is in |value_to_ids| or is
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// computed earlier in |block|.
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//
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// |vnTable| must have computed a value number for every result id defined
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// in |bb|.
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//
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// |value_to_ids| is a map from value number to ids. If {vn, id} is in
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// |value_to_ids| then vn is the value number of id, and the definition of id
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// dominates |bb|.
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//
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// Returns true if the module is changed.
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bool EliminateRedundanciesInBB(ir::BasicBlock* block,
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const ValueNumberTable& vnTable,
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std::map<uint32_t, uint32_t>* value_to_ids);
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};
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} // namespace opt
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} // namespace spvtools
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#endif // LIBSPIRV_OPT_LOCAL_REDUNDANCY_ELIMINATION_H_
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