| // Copyright (c) 2017 The Khronos Group Inc. |
| // Copyright (c) 2017 Valve Corporation |
| // Copyright (c) 2017 LunarG Inc. |
| // |
| // 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 "source/opt/block_merge_pass.h" |
| |
| #include "source/opt/block_merge_util.h" |
| #include "source/opt/ir_context.h" |
| |
| namespace spvtools { |
| namespace opt { |
| |
| bool BlockMergePass::MergeBlocks(Function* func) { |
| bool modified = false; |
| for (auto bi = func->begin(); bi != func->end();) { |
| // Don't bother trying to merge unreachable blocks. |
| if (context()->IsReachable(*bi) && |
| blockmergeutil::CanMergeWithSuccessor(context(), &*bi)) { |
| blockmergeutil::MergeWithSuccessor(context(), func, bi); |
| // Reprocess block. |
| modified = true; |
| } else { |
| ++bi; |
| } |
| } |
| return modified; |
| } |
| |
| Pass::Status BlockMergePass::Process() { |
| // Process all entry point functions. |
| ProcessFunction pfn = [this](Function* fp) { return MergeBlocks(fp); }; |
| bool modified = context()->ProcessReachableCallTree(pfn); |
| return modified ? Status::SuccessWithChange : Status::SuccessWithoutChange; |
| } |
| |
| BlockMergePass::BlockMergePass() = default; |
| |
| } // namespace opt |
| } // namespace spvtools |