1// Copyright (c) 2017 The Khronos Group Inc.
2// Copyright (c) 2017 Valve Corporation
3// Copyright (c) 2017 LunarG Inc.
4//
5// Licensed under the Apache License, Version 2.0 (the "License");
6// you may not use this file except in compliance with the License.
7// You may obtain a copy of the License at
8//
9// http://www.apache.org/licenses/LICENSE-2.0
10//
11// Unless required by applicable law or agreed to in writing, software
12// distributed under the License is distributed on an "AS IS" BASIS,
13// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14// See the License for the specific language governing permissions and
15// limitations under the License.
16
17#include "source/opt/block_merge_pass.h"
18
19#include <vector>
20
21#include "source/opt/block_merge_util.h"
22#include "source/opt/ir_context.h"
23#include "source/opt/iterator.h"
24
25namespace spvtools {
26namespace opt {
27
28bool BlockMergePass::MergeBlocks(Function* func) {
29 bool modified = false;
30 for (auto bi = func->begin(); bi != func->end();) {
31 if (blockmergeutil::CanMergeWithSuccessor(context(), &*bi)) {
32 blockmergeutil::MergeWithSuccessor(context(), func, bi);
33 // Reprocess block.
34 modified = true;
35 } else {
36 ++bi;
37 }
38 }
39 return modified;
40}
41
42Pass::Status BlockMergePass::Process() {
43 // Process all entry point functions.
44 ProcessFunction pfn = [this](Function* fp) { return MergeBlocks(fp); };
45 bool modified = context()->ProcessEntryPointCallTree(pfn);
46 return modified ? Status::SuccessWithChange : Status::SuccessWithoutChange;
47}
48
49BlockMergePass::BlockMergePass() = default;
50
51} // namespace opt
52} // namespace spvtools
53