mirror of
https://github.com/KhronosGroup/SPIRV-Tools
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145 lines
6.6 KiB
C++
145 lines
6.6 KiB
C++
// Copyright (c) 2019 Google LLC
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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_DESC_SROA_H_
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#define SOURCE_OPT_DESC_SROA_H_
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#include <cstdio>
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#include <memory>
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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 <vector>
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#include "source/opt/function.h"
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#include "source/opt/pass.h"
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#include "source/opt/type_manager.h"
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namespace spvtools {
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namespace opt {
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// Documented in optimizer.hpp
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class DescriptorScalarReplacement : public Pass {
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public:
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DescriptorScalarReplacement() {}
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const char* name() const override { return "descriptor-scalar-replacement"; }
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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::kAnalysisCombinators | IRContext::kAnalysisCFG |
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IRContext::kAnalysisConstants | IRContext::kAnalysisTypes;
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}
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private:
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// Replaces all references to |var| by new variables, one for each element of
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// the array |var|. The binding for the new variables corresponding to
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// element i will be the binding of |var| plus i. Returns true if successful.
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bool ReplaceCandidate(Instruction* var);
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// Replaces the base address |var| in the OpAccessChain or
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// OpInBoundsAccessChain instruction |use| by the variable that the access
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// chain accesses. The first index in |use| must be an |OpConstant|. Returns
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// |true| if successful.
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bool ReplaceAccessChain(Instruction* var, Instruction* use);
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// Replaces the given compososite variable |var| loaded by OpLoad |value| with
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// replacement variables, one for each component that's accessed in the
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// shader. Assumes that |value| is only used by OpCompositeExtract
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// instructions, one index at a time. Returns true on success, and false
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// otherwise.
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bool ReplaceLoadedValue(Instruction* var, Instruction* value);
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// Replaces the given OpCompositeExtract |extract| and all of its references
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// with an OpLoad of a replacement variable. |var| is the variable with
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// composite type whose value is being used by |extract|. Assumes that
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// |extract| is extracting one index only. Returns true on success, and false
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// otherwise.
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bool ReplaceCompositeExtract(Instruction* var, Instruction* extract);
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// Returns the id of the variable that will be used to replace the |idx|th
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// element of |var|. The variable is created if it has not already been
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// created.
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uint32_t GetReplacementVariable(Instruction* var, uint32_t idx);
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// Returns the id of a new variable that can be used to replace the |idx|th
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// element of |var|.
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uint32_t CreateReplacementVariable(Instruction* var, uint32_t idx);
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// Returns the number of bindings used by the given |type_id|.
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// All types are considered to use 1 binding slot, except:
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// 1- A pointer type consumes as many binding numbers as its pointee.
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// 2- An array of size N consumes N*M binding numbers, where M is the number
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// of bindings used by each array element.
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// 3- The number of bindings consumed by a structure is the sum of the
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// bindings used by its members.
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uint32_t GetNumBindingsUsedByType(uint32_t type_id);
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// Copy all of the decorations of variable |old_var| and make them as
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// decorations for the new variable whose id is |new_var_id|. The new variable
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// is supposed to replace |index|th element of |old_var|.
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// |new_var_ptr_type_id| is the id of the pointer to the type of the new
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// variable. |is_old_var_array| is true if |old_var| has an array type.
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// |is_old_var_struct| is true if |old_var| has a structure type.
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// |old_var_type| is the pointee type of |old_var|.
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void CopyDecorationsForNewVariable(Instruction* old_var, uint32_t index,
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uint32_t new_var_id,
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uint32_t new_var_ptr_type_id,
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const bool is_old_var_array,
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const bool is_old_var_struct,
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Instruction* old_var_type);
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// Get the new binding number for a new variable that will be replaced with an
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// |index|th element of an old variable. The old variable has |old_binding|
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// as its binding number. |ptr_elem_type_id| the id of the pointer to the
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// element type. |is_old_var_array| is true if the old variable has an array
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// type. |is_old_var_struct| is true if the old variable has a structure type.
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// |old_var_type| is the pointee type of the old variable.
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uint32_t GetNewBindingForElement(uint32_t old_binding, uint32_t index,
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uint32_t ptr_elem_type_id,
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const bool is_old_var_array,
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const bool is_old_var_struct,
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Instruction* old_var_type);
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// Create a new OpDecorate(String) instruction by cloning |old_decoration|.
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// The new OpDecorate(String) instruction will be used for a variable whose id
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// is |new_var_ptr_type_id|. If |old_decoration| is a decoration for a
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// binding, the new OpDecorate(String) instruction will have |new_binding| as
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// its binding.
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void CreateNewDecorationForNewVariable(Instruction* old_decoration,
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uint32_t new_var_id,
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uint32_t new_binding);
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// Create a new OpDecorate instruction whose operand is the same as an
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// OpMemberDecorate instruction |old_member_decoration| except Target operand.
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// The Target operand of the new OpDecorate instruction will be |new_var_id|.
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void CreateNewDecorationForMemberDecorate(Instruction* old_decoration,
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uint32_t new_var_id);
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// A map from an OpVariable instruction to the set of variables that will be
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// used to replace it. The entry |replacement_variables_[var][i]| is the id of
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// a variable that will be used in the place of the ith element of the
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// array |var|. If the entry is |0|, then the variable has not been
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// created yet.
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std::map<Instruction*, std::vector<uint32_t>> replacement_variables_;
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};
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} // namespace opt
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} // namespace spvtools
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#endif // SOURCE_OPT_DESC_SROA_H_
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