mirror of
https://github.com/KhronosGroup/SPIRV-Tools
synced 2024-11-29 22:41:03 +00:00
85 lines
3.2 KiB
C
85 lines
3.2 KiB
C
|
// Copyright (c) 2020 Google LLC
|
||
|
|
//
|
||
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
// you may not use this file except in compliance with the License.
|
||
|
|
// You may obtain a copy of the License at
|
||
|
|
//
|
||
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
//
|
||
|
|
// Unless required by applicable law or agreed to in writing, software
|
||
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
// See the License for the specific language governing permissions and
|
||
|
|
// limitations under the License.
|
||
|
|
|
||
|
|
#ifndef SOURCE_REDUCE_REMOVE_STRUCT_MEMBER_REDUCTION_OPPORTUNITY_H_
|
||
|
|
#define SOURCE_REDUCE_REMOVE_STRUCT_MEMBER_REDUCTION_OPPORTUNITY_H_
|
||
|
|
|
||
|
|
#include "source/reduce/reduction_opportunity.h"
|
||
|
|
|
||
|
|
#include "source/opt/instruction.h"
|
||
|
|
|
||
|
|
namespace spvtools {
|
||
|
|
namespace reduce {
|
||
|
|
|
||
|
|
// An opportunity for removing a member from a struct type, adjusting all uses
|
||
|
|
// of the struct accordingly.
|
||
|
|
class RemoveStructMemberReductionOpportunity : public ReductionOpportunity {
|
||
|
|
public:
|
||
|
|
// Constructs a reduction opportunity from the struct type |struct_type|, for
|
||
|
|
// removal of member |member_index|.
|
||
|
|
RemoveStructMemberReductionOpportunity(opt::Instruction* struct_type,
|
||
|
|
uint32_t member_index)
|
||
|
|
: struct_type_(struct_type),
|
||
|
|
member_index_(member_index),
|
||
|
|
original_number_of_members_(struct_type->NumInOperands()) {}
|
||
|
|
|
||
|
|
// Opportunities to remove fields from a common struct type mutually
|
||
|
|
// invalidate each other. We guard against this by requiring that the struct
|
||
|
|
// still has the number of members it had when the opportunity was created.
|
||
|
|
bool PreconditionHolds() override;
|
||
|
|
|
||
|
|
protected:
|
||
|
|
void Apply() override;
|
||
|
|
|
||
|
|
private:
|
||
|
|
// |composite_access_instruction| is an instruction that accesses a composite
|
||
|
|
// id using either a series of literal indices (e.g. in the case of
|
||
|
|
// OpCompositeInsert) or a series of index ids (e.g. in the case of
|
||
|
|
// OpAccessChain).
|
||
|
|
//
|
||
|
|
// This function adjusts the indices that are used by
|
||
|
|
// |composite_access_instruction| to that whenever an index is accessing a
|
||
|
|
// member of |struct_type_|, it is decremented if the member is beyond
|
||
|
|
// |member_index_|, to account for the removal of the |member_index_|-th
|
||
|
|
// member.
|
||
|
|
//
|
||
|
|
// |composite_type_id| is the id of the composite type that the series of
|
||
|
|
// indices is to be applied to.
|
||
|
|
//
|
||
|
|
// |first_index_input_operand| specifies the first input operand that is an
|
||
|
|
// index.
|
||
|
|
//
|
||
|
|
// |literal_indices| specifies whether indices are given as literals (true),
|
||
|
|
// or as ids (false).
|
||
|
|
//
|
||
|
|
// If id-based indexing is used, this function will add a constant for
|
||
|
|
// |member_index_| - 1 to the module if needed.
|
||
|
|
void AdjustAccessedIndices(
|
||
|
|
uint32_t composite_type_id, uint32_t first_index_input_operand,
|
||
|
|
bool literal_indices, opt::IRContext* context,
|
||
|
|
opt::Instruction* composite_access_instruction) const;
|
||
|
|
|
||
|
|
// The struct type from which a member is to be removed.
|
||
|
|
opt::Instruction* struct_type_;
|
||
|
|
|
||
|
|
uint32_t member_index_;
|
||
|
|
|
||
|
|
uint32_t original_number_of_members_;
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace reduce
|
||
|
|
} // namespace spvtools
|
||
|
|
|
||
|
|
#endif // SOURCE_REDUCE_REMOVE_STRUCT_MEMBER_REDUCTION_OPPORTUNITY_H_
|