| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * 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. |
| */ |
| |
| #include "instruction_simplifier_arm64.h" |
| |
| #include "common_arm64.h" |
| #include "instruction_simplifier_shared.h" |
| #include "mirror/array-inl.h" |
| #include "mirror/string.h" |
| |
| namespace art { |
| |
| using helpers::CanFitInShifterOperand; |
| using helpers::HasShifterOperand; |
| |
| namespace arm64 { |
| |
| using helpers::ShifterOperandSupportsExtension; |
| |
| bool InstructionSimplifierArm64Visitor::TryMergeIntoShifterOperand(HInstruction* use, |
| HInstruction* bitfield_op, |
| bool do_merge) { |
| DCHECK(HasShifterOperand(use, kArm64)); |
| DCHECK(use->IsBinaryOperation() || use->IsNeg()); |
| DCHECK(CanFitInShifterOperand(bitfield_op)); |
| DCHECK(!bitfield_op->HasEnvironmentUses()); |
| |
| DataType::Type type = use->GetType(); |
| if (type != DataType::Type::kInt32 && type != DataType::Type::kInt64) { |
| return false; |
| } |
| |
| HInstruction* left; |
| HInstruction* right; |
| if (use->IsBinaryOperation()) { |
| left = use->InputAt(0); |
| right = use->InputAt(1); |
| } else { |
| DCHECK(use->IsNeg()); |
| right = use->AsNeg()->InputAt(0); |
| left = GetGraph()->GetConstant(right->GetType(), 0); |
| } |
| DCHECK(left == bitfield_op || right == bitfield_op); |
| |
| if (left == right) { |
| // TODO: Handle special transformations in this situation? |
| // For example should we transform `(x << 1) + (x << 1)` into `(x << 2)`? |
| // Or should this be part of a separate transformation logic? |
| return false; |
| } |
| |
| bool is_commutative = use->IsBinaryOperation() && use->AsBinaryOperation()->IsCommutative(); |
| HInstruction* other_input; |
| if (bitfield_op == right) { |
| other_input = left; |
| } else { |
| if (is_commutative) { |
| other_input = right; |
| } else { |
| return false; |
| } |
| } |
| |
| HDataProcWithShifterOp::OpKind op_kind; |
| int shift_amount = 0; |
| HDataProcWithShifterOp::GetOpInfoFromInstruction(bitfield_op, &op_kind, &shift_amount); |
| |
| if (HDataProcWithShifterOp::IsExtensionOp(op_kind) && !ShifterOperandSupportsExtension(use)) { |
| return false; |
| } |
| |
| if (do_merge) { |
| HDataProcWithShifterOp* alu_with_op = |
| new (GetGraph()->GetArena()) HDataProcWithShifterOp(use, |
| other_input, |
| bitfield_op->InputAt(0), |
| op_kind, |
| shift_amount, |
| use->GetDexPc()); |
| use->GetBlock()->ReplaceAndRemoveInstructionWith(use, alu_with_op); |
| if (bitfield_op->GetUses().empty()) { |
| bitfield_op->GetBlock()->RemoveInstruction(bitfield_op); |
| } |
| RecordSimplification(); |
| } |
| |
| return true; |
| } |
| |
| // Merge a bitfield move instruction into its uses if it can be merged in all of them. |
| bool InstructionSimplifierArm64Visitor::TryMergeIntoUsersShifterOperand(HInstruction* bitfield_op) { |
| DCHECK(CanFitInShifterOperand(bitfield_op)); |
| |
| if (bitfield_op->HasEnvironmentUses()) { |
| return false; |
| } |
| |
| const HUseList<HInstruction*>& uses = bitfield_op->GetUses(); |
| |
| // Check whether we can merge the instruction in all its users' shifter operand. |
| for (const HUseListNode<HInstruction*>& use : uses) { |
| HInstruction* user = use.GetUser(); |
| if (!HasShifterOperand(user, kArm64)) { |
| return false; |
| } |
| if (!CanMergeIntoShifterOperand(user, bitfield_op)) { |
| return false; |
| } |
| } |
| |
| // Merge the instruction into its uses. |
| for (auto it = uses.begin(), end = uses.end(); it != end; /* ++it below */) { |
| HInstruction* user = it->GetUser(); |
| // Increment `it` now because `*it` will disappear thanks to MergeIntoShifterOperand(). |
| ++it; |
| bool merged = MergeIntoShifterOperand(user, bitfield_op); |
| DCHECK(merged); |
| } |
| |
| return true; |
| } |
| |
| void InstructionSimplifierArm64Visitor::VisitAnd(HAnd* instruction) { |
| if (TryMergeNegatedInput(instruction)) { |
| RecordSimplification(); |
| } |
| } |
| |
| void InstructionSimplifierArm64Visitor::VisitArrayGet(HArrayGet* instruction) { |
| size_t data_offset = CodeGenerator::GetArrayDataOffset(instruction); |
| if (TryExtractArrayAccessAddress(instruction, |
| instruction->GetArray(), |
| instruction->GetIndex(), |
| data_offset)) { |
| RecordSimplification(); |
| } |
| } |
| |
| void InstructionSimplifierArm64Visitor::VisitArraySet(HArraySet* instruction) { |
| size_t access_size = DataType::Size(instruction->GetComponentType()); |
| size_t data_offset = mirror::Array::DataOffset(access_size).Uint32Value(); |
| if (TryExtractArrayAccessAddress(instruction, |
| instruction->GetArray(), |
| instruction->GetIndex(), |
| data_offset)) { |
| RecordSimplification(); |
| } |
| } |
| |
| void InstructionSimplifierArm64Visitor::VisitMul(HMul* instruction) { |
| if (TryCombineMultiplyAccumulate(instruction, kArm64)) { |
| RecordSimplification(); |
| } |
| } |
| |
| void InstructionSimplifierArm64Visitor::VisitOr(HOr* instruction) { |
| if (TryMergeNegatedInput(instruction)) { |
| RecordSimplification(); |
| } |
| } |
| |
| void InstructionSimplifierArm64Visitor::VisitShl(HShl* instruction) { |
| if (instruction->InputAt(1)->IsConstant()) { |
| TryMergeIntoUsersShifterOperand(instruction); |
| } |
| } |
| |
| void InstructionSimplifierArm64Visitor::VisitShr(HShr* instruction) { |
| if (instruction->InputAt(1)->IsConstant()) { |
| TryMergeIntoUsersShifterOperand(instruction); |
| } |
| } |
| |
| void InstructionSimplifierArm64Visitor::VisitTypeConversion(HTypeConversion* instruction) { |
| DataType::Type result_type = instruction->GetResultType(); |
| DataType::Type input_type = instruction->GetInputType(); |
| |
| if (input_type == result_type) { |
| // We let the arch-independent code handle this. |
| return; |
| } |
| |
| if (DataType::IsIntegralType(result_type) && DataType::IsIntegralType(input_type)) { |
| TryMergeIntoUsersShifterOperand(instruction); |
| } |
| } |
| |
| void InstructionSimplifierArm64Visitor::VisitUShr(HUShr* instruction) { |
| if (instruction->InputAt(1)->IsConstant()) { |
| TryMergeIntoUsersShifterOperand(instruction); |
| } |
| } |
| |
| void InstructionSimplifierArm64Visitor::VisitXor(HXor* instruction) { |
| if (TryMergeNegatedInput(instruction)) { |
| RecordSimplification(); |
| } |
| } |
| |
| void InstructionSimplifierArm64Visitor::VisitVecLoad(HVecLoad* instruction) { |
| if (!instruction->IsStringCharAt() |
| && TryExtractVecArrayAccessAddress(instruction, instruction->GetIndex())) { |
| RecordSimplification(); |
| } |
| } |
| |
| void InstructionSimplifierArm64Visitor::VisitVecStore(HVecStore* instruction) { |
| if (TryExtractVecArrayAccessAddress(instruction, instruction->GetIndex())) { |
| RecordSimplification(); |
| } |
| } |
| |
| } // namespace arm64 |
| } // namespace art |