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https://github.com/KhronosGroup/SPIRV-Tools
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048dcd38ce
WebGPU requires certain variables to be initialized, whereas there are known issues with using initializers in Vulkan. This PR is the first of three implementing a pass to decompose initialized variables into a variable declaration followed by a store. This has been broken up into multiple PRs, because there 3 distinct cases that need to be handled, which require separate implementations. This first PR implements the basic infrastructure that is needed, and handling of Function storage class variables. Private and Output will be handled in future PRs. This is part of resolving #2388
58 lines
2.1 KiB
C++
58 lines
2.1 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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#include "source/opt/strip_atomic_counter_memory_pass.h"
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#include "source/opt/ir_context.h"
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namespace spvtools {
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namespace opt {
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Pass::Status StripAtomicCounterMemoryPass::Process() {
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bool changed = false;
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context()->module()->ForEachInst([this, &changed](Instruction* inst) {
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auto indices = spvOpcodeMemorySemanticsOperandIndices(inst->opcode());
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if (indices.empty()) return;
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for (auto idx : indices) {
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auto mem_sem_id = inst->GetSingleWordOperand(idx);
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const auto& mem_sem_inst =
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context()->get_def_use_mgr()->GetDef(mem_sem_id);
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// The spec explicitly says that this id must be an OpConstant
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auto mem_sem_val = mem_sem_inst->GetSingleWordOperand(2);
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if (!(mem_sem_val & SpvMemorySemanticsAtomicCounterMemoryMask)) {
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continue;
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}
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mem_sem_val &= ~SpvMemorySemanticsAtomicCounterMemoryMask;
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analysis::Integer int_type(32, false);
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const analysis::Type* uint32_type =
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context()->get_type_mgr()->GetRegisteredType(&int_type);
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auto* new_const = context()->get_constant_mgr()->GetConstant(
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uint32_type, {mem_sem_val});
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auto* new_const_inst =
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context()->get_constant_mgr()->GetDefiningInstruction(new_const);
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auto new_const_id = new_const_inst->result_id();
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inst->SetOperand(idx, {new_const_id});
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context()->UpdateDefUse(inst);
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changed = true;
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}
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});
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return changed ? Status::SuccessWithChange : Status::SuccessWithoutChange;
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}
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} // namespace opt
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} // namespace spvtools
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