mirror of
https://github.com/KhronosGroup/SPIRV-Tools
synced 2024-12-12 19:50:09 +00:00
1a7f71afb4
Constexpr guaranteed no runtime init in addition to const semantics. Moving all opt/ to constexpr. Moving all compile-unit statics to anonymous namespaces to uniformize the method used (anonymous namespace vs static has the same behavior here AFAIK). Signed-off-by: Nathan Gauër <brioche@google.com>
117 lines
4.2 KiB
C++
117 lines
4.2 KiB
C++
// Copyright (c) 2021 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/desc_sroa_util.h"
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namespace spvtools {
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namespace opt {
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namespace {
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constexpr uint32_t kOpAccessChainInOperandIndexes = 1;
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// Returns the length of array type |type|.
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uint32_t GetLengthOfArrayType(IRContext* context, Instruction* type) {
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assert(type->opcode() == spv::Op::OpTypeArray && "type must be array");
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uint32_t length_id = type->GetSingleWordInOperand(1);
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const analysis::Constant* length_const =
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context->get_constant_mgr()->FindDeclaredConstant(length_id);
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assert(length_const != nullptr);
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return length_const->GetU32();
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}
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} // namespace
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namespace descsroautil {
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bool IsDescriptorArray(IRContext* context, Instruction* var) {
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if (var->opcode() != spv::Op::OpVariable) {
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return false;
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}
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uint32_t ptr_type_id = var->type_id();
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Instruction* ptr_type_inst = context->get_def_use_mgr()->GetDef(ptr_type_id);
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if (ptr_type_inst->opcode() != spv::Op::OpTypePointer) {
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return false;
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}
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uint32_t var_type_id = ptr_type_inst->GetSingleWordInOperand(1);
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Instruction* var_type_inst = context->get_def_use_mgr()->GetDef(var_type_id);
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if (var_type_inst->opcode() != spv::Op::OpTypeArray &&
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var_type_inst->opcode() != spv::Op::OpTypeStruct) {
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return false;
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}
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// All structures with descriptor assignments must be replaced by variables,
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// one for each of their members - with the exceptions of buffers.
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if (IsTypeOfStructuredBuffer(context, var_type_inst)) {
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return false;
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}
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if (!context->get_decoration_mgr()->HasDecoration(
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var->result_id(), uint32_t(spv::Decoration::DescriptorSet))) {
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return false;
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}
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return context->get_decoration_mgr()->HasDecoration(
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var->result_id(), uint32_t(spv::Decoration::Binding));
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}
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bool IsTypeOfStructuredBuffer(IRContext* context, const Instruction* type) {
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if (type->opcode() != spv::Op::OpTypeStruct) {
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return false;
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}
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// All buffers have offset decorations for members of their structure types.
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// This is how we distinguish it from a structure of descriptors.
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return context->get_decoration_mgr()->HasDecoration(
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type->result_id(), uint32_t(spv::Decoration::Offset));
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}
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const analysis::Constant* GetAccessChainIndexAsConst(
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IRContext* context, Instruction* access_chain) {
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if (access_chain->NumInOperands() <= 1) {
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return nullptr;
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}
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uint32_t idx_id = GetFirstIndexOfAccessChain(access_chain);
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const analysis::Constant* idx_const =
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context->get_constant_mgr()->FindDeclaredConstant(idx_id);
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return idx_const;
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}
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uint32_t GetFirstIndexOfAccessChain(Instruction* access_chain) {
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assert(access_chain->NumInOperands() > 1 &&
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"OpAccessChain does not have Indexes operand");
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return access_chain->GetSingleWordInOperand(kOpAccessChainInOperandIndexes);
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}
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uint32_t GetNumberOfElementsForArrayOrStruct(IRContext* context,
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Instruction* var) {
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uint32_t ptr_type_id = var->type_id();
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Instruction* ptr_type_inst = context->get_def_use_mgr()->GetDef(ptr_type_id);
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assert(ptr_type_inst->opcode() == spv::Op::OpTypePointer &&
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"Variable should be a pointer to an array or structure.");
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uint32_t pointee_type_id = ptr_type_inst->GetSingleWordInOperand(1);
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Instruction* pointee_type_inst =
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context->get_def_use_mgr()->GetDef(pointee_type_id);
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if (pointee_type_inst->opcode() == spv::Op::OpTypeArray) {
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return GetLengthOfArrayType(context, pointee_type_inst);
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}
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assert(pointee_type_inst->opcode() == spv::Op::OpTypeStruct &&
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"Variable should be a pointer to an array or structure.");
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return pointee_type_inst->NumInOperands();
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}
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} // namespace descsroautil
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} // namespace opt
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} // namespace spvtools
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