| // Copyright 2023 The Dawn & Tint Authors |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are met: |
| // |
| // 1. Redistributions of source code must retain the above copyright notice, this |
| // list of conditions and the following disclaimer. |
| // |
| // 2. Redistributions in binary form must reproduce the above copyright notice, |
| // this list of conditions and the following disclaimer in the documentation |
| // and/or other materials provided with the distribution. |
| // |
| // 3. Neither the name of the copyright holder nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
| // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #include "src/tint/lang/core/ir/transform/combine_access_instructions.h" |
| |
| #include <utility> |
| |
| #include "src/tint/lang/core/ir/builder.h" |
| #include "src/tint/lang/core/ir/module.h" |
| #include "src/tint/lang/core/ir/validator.h" |
| |
| using namespace tint::core::fluent_types; // NOLINT |
| using namespace tint::core::number_suffixes; // NOLINT |
| |
| namespace tint::core::ir::transform { |
| |
| namespace { |
| |
| /// PIMPL state for the transform. |
| struct State { |
| /// The IR module. |
| Module& ir; |
| |
| /// Process the module. |
| void Process() { |
| // Loop over every instruction looking for access instructions. |
| for (auto* inst : ir.Instructions()) { |
| if (auto* access = inst->As<ir::Access>()) { |
| // Look for places where the result of this access instruction is used as a base |
| // pointer for another access instruction. |
| access->Result(0)->ForEachUse([&](Usage use) { |
| auto* child = use.instruction->As<ir::Access>(); |
| if (child && use.operand_index == ir::Access::kObjectOperandOffset) { |
| // Push the indices of the parent access instruction into the child. |
| Vector<ir::Value*, 4> operands; |
| operands.Push(access->Object()); |
| for (auto* idx : access->Indices()) { |
| operands.Push(idx); |
| } |
| for (auto* idx : child->Indices()) { |
| operands.Push(idx); |
| } |
| child->SetOperands(std::move(operands)); |
| } |
| }); |
| |
| // If there are no other uses of the access instruction, remove it. |
| if (access->Result(0)->Usages().IsEmpty()) { |
| access->Destroy(); |
| } |
| } |
| } |
| } |
| }; |
| |
| } // namespace |
| |
| Result<SuccessType> CombineAccessInstructions(Module& ir) { |
| auto result = ValidateAndDumpIfNeeded(ir, "CombineAccessInstructions transform"); |
| if (result != Success) { |
| return result; |
| } |
| |
| State{ir}.Process(); |
| |
| return Success; |
| } |
| |
| } // namespace tint::core::ir::transform |