1// Copyright (c) 2017 The Khronos Group Inc.
2// Copyright (c) 2017 Valve Corporation
3// Copyright (c) 2017 LunarG Inc.
4// Copyright (c) 2019 Google LLC
5//
6// Licensed under the Apache License, Version 2.0 (the "License");
7// you may not use this file except in compliance with the License.
8// You may obtain a copy of the License at
9//
10// http://www.apache.org/licenses/LICENSE-2.0
11//
12// Unless required by applicable law or agreed to in writing, software
13// distributed under the License is distributed on an "AS IS" BASIS,
14// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15// See the License for the specific language governing permissions and
16// limitations under the License.
17
18#ifndef SOURCE_OPT_BLOCK_MERGE_UTIL_H_
19#define SOURCE_OPT_BLOCK_MERGE_UTIL_H_
20
21#include "source/opt/ir_context.h"
22
23namespace spvtools {
24namespace opt {
25
26// Provides functions for determining when it is safe to merge blocks, and for
27// actually merging blocks, for use by various analyses and passes.
28namespace blockmergeutil {
29
30// Returns true if and only if |block| has exactly one successor and merging
31// this successor into |block| has no impact on the semantics or validity of the
32// SPIR-V module.
33bool CanMergeWithSuccessor(IRContext* context, BasicBlock* block);
34
35// Requires that |bi| has a successor that can be safely merged into |bi|, and
36// performs the merge.
37void MergeWithSuccessor(IRContext* context, Function* func,
38 Function::iterator bi);
39
40} // namespace blockmergeutil
41} // namespace opt
42} // namespace spvtools
43
44#endif // SOURCE_OPT_BLOCK_MERGE_UTIL_H_
45