| /* |
| * Copyright (C) 2014 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 "prepare_for_register_allocation.h" |
| |
| namespace art { |
| |
| void PrepareForRegisterAllocation::Run() { |
| // Order does not matter. |
| for (HReversePostOrderIterator it(*GetGraph()); !it.Done(); it.Advance()) { |
| HBasicBlock* block = it.Current(); |
| // No need to visit the phis. |
| for (HInstructionIterator it(block->GetInstructions()); !it.Done(); it.Advance()) { |
| it.Current()->Accept(this); |
| } |
| } |
| } |
| |
| void PrepareForRegisterAllocation::VisitNullCheck(HNullCheck* check) { |
| check->ReplaceWith(check->InputAt(0)); |
| } |
| |
| void PrepareForRegisterAllocation::VisitBoundsCheck(HBoundsCheck* check) { |
| check->ReplaceWith(check->InputAt(0)); |
| } |
| |
| void PrepareForRegisterAllocation::VisitClinitCheck(HClinitCheck* check) { |
| check->ReplaceWith(check->InputAt(0)); |
| } |
| |
| void PrepareForRegisterAllocation::VisitCondition(HCondition* condition) { |
| bool needs_materialization = false; |
| if (!condition->HasOnlyOneUse()) { |
| needs_materialization = true; |
| } else { |
| HUseListNode<HInstruction>* uses = condition->GetUses(); |
| HInstruction* user = uses->GetUser(); |
| if (!user->IsIf()) { |
| needs_materialization = true; |
| } else { |
| // TODO: if there is no intervening instructions with side-effect between this condition |
| // and the If instruction, we should move the condition just before the If. |
| if (condition->GetNext() != user) { |
| needs_materialization = true; |
| } |
| } |
| } |
| if (!needs_materialization) { |
| condition->ClearNeedsMaterialization(); |
| } |
| } |
| |
| } // namespace art |