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 
25 namespace spvtools {
26 namespace opt {
27 
MergeBlocks(Function * func)28 bool 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 
Process()42 Pass::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 
49 BlockMergePass::BlockMergePass() = default;
50 
51 }  // namespace opt
52 }  // namespace spvtools
53