chromium/third_party/spirv-tools/src/source/opt/block_merge_util.cpp

// Copyright (c) 2017 The Khronos Group Inc.
// Copyright (c) 2017 Valve Corporation
// Copyright (c) 2017 LunarG Inc.
// Copyright (c) 2019 Google LLC
//
// 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 "block_merge_util.h"

namespace spvtools {
namespace opt {
namespace blockmergeutil {
namespace {

// Returns true if |block| contains a merge instruction.
bool IsHeader(BasicBlock* block) { … }

// Returns true if |id| contains a merge instruction.
bool IsHeader(IRContext* context, uint32_t id) { … }

// Returns true if |id| is the merge target of a merge instruction.
bool IsMerge(IRContext* context, uint32_t id) { … }

// Returns true if |block| is the merge target of a merge instruction.
bool IsMerge(IRContext* context, BasicBlock* block) { … }

// Returns true if |id| is the continue target of a merge instruction.
bool IsContinue(IRContext* context, uint32_t id) { … }

// Removes any OpPhi instructions in |block|, which should have exactly one
// predecessor, replacing uses of OpPhi ids with the ids associated with the
// predecessor.
void EliminateOpPhiInstructions(IRContext* context, BasicBlock* block) { … }

}  // Anonymous namespace

bool CanMergeWithSuccessor(IRContext* context, BasicBlock* block) { … }

void MergeWithSuccessor(IRContext* context, Function* func,
                        Function::iterator bi) { … }

}  // namespace blockmergeutil
}  // namespace opt
}  // namespace spvtools