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https://github.com/KhronosGroup/SPIRV-Tools
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a1f9e1342e
The following passes are updated to preserve the inst-to-block and def-use analysies: private-to-local aggressive dead-code elimination dead branch elimination local-single-block elimination local-single-store elimination reduce load size compact ids (inst-to-block only) merge block dead-insert elimination ccp The one execption is that compact ids still kills the def-use manager. This is because it changes so many ids it is faster to kill and rebuild. Does everything in https://github.com/KhronosGroup/SPIRV-Tools/issues/1593 except for the changes to merge return.
73 lines
2.9 KiB
C++
73 lines
2.9 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_PRIVATE_TO_LOCAL_PASS_H_
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#define LIBSPIRV_OPT_PRIVATE_TO_LOCAL_PASS_H_
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#include "ir_context.h"
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#include "pass.h"
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namespace spvtools {
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namespace opt {
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// This pass implements total redundancy elimination. This is the same as
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// local redundancy elimination except it looks across basic block boundaries.
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// An instruction, inst, is totally redundant if there is another instruction
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// that dominates inst, and also computes the same value.
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class PrivateToLocalPass : public Pass {
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public:
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const char* name() const override { return "private-to-local"; }
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Status Process(ir::IRContext*) override;
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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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private:
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// Moves |variable| from the private storage class to the function storage
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// class of |function|.
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void MoveVariable(ir::Instruction* variable, ir::Function* function);
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// |inst| is an instruction declaring a varible. If that variable is
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// referenced in a single function and all of uses are valid as defined by
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// |IsValidUse|, then that function is returned. Otherwise, the return
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// value is |nullptr|.
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ir::Function* FindLocalFunction(const ir::Instruction& inst) const;
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// Returns true is |inst| is a valid use of a pointer. In this case, a
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// valid use is one where the transformation is able to rewrite the type to
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// match a change in storage class of the original variable.
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bool IsValidUse(const ir::Instruction* inst) const;
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// Given the result id of a pointer type, |old_type_id|, this function
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// returns the id of a the same pointer type except the storage class has
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// been changed to function. If the type does not already exist, it will be
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// created.
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uint32_t GetNewType(uint32_t old_type_id);
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// Updates |inst|, and any instruction dependent on |inst|, to reflect the
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// change of the base pointer now pointing to the function storage class.
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void UpdateUse(ir::Instruction* inst);
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void UpdateUses(uint32_t id);
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};
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} // namespace opt
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} // namespace spvtools
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#endif // LIBSPIRV_OPT_PRIVATE_TO_LOCAL_PASS_H_
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