chromium/third_party/spirv-tools/src/source/opt/ssa_rewrite_pass.h

// Copyright (c) 2018 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.

#ifndef SOURCE_OPT_SSA_REWRITE_PASS_H_
#define SOURCE_OPT_SSA_REWRITE_PASS_H_

#include <queue>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>

#include "source/opt/basic_block.h"
#include "source/opt/ir_context.h"
#include "source/opt/mem_pass.h"

namespace spvtools {
namespace opt {

// Utility class for passes that need to rewrite a function into SSA.  This
// converts load/store operations on function-local variables into SSA IDs,
// which allows them to be the target of optimizing transformations.
//
// Store and load operations to these variables are converted into
// operations on SSA IDs.  Phi instructions are added when needed.  See the
// SSA construction paper for algorithmic details
// (https://link.springer.com/chapter/10.1007/978-3-642-37051-9_6)
class SSARewriter { … };

class SSARewritePass : public MemPass { … };

}  // namespace opt
}  // namespace spvtools

#endif  // SOURCE_OPT_SSA_REWRITE_PASS_H_