chromium/v8/src/wasm/baseline/parallel-move.h

// Copyright 2023 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef V8_WASM_BASELINE_PARALLEL_MOVE_H_
#define V8_WASM_BASELINE_PARALLEL_MOVE_H_

#include "src/wasm/baseline/liftoff-assembler.h"
#include "src/wasm/baseline/liftoff-register.h"
#include "src/wasm/wasm-value.h"

namespace v8::internal::wasm {

// ParallelMove is a utility class that encodes multiple moves from registers to
// registers (`RegisterMove`), constants to registers (`RegisterLoad` with
// `LoadKind::kConstant`), or stack slots to registers (other
// `RegisterLoad`s).
// It can handle cyclic moves, e.g., swaps between registers.
// The moves are typically prepared/encoded into an instance via the high-level
// entry point `Transfer`, which takes two Wasm value stack configurations
// (`VarState`) as input.
// Code is actually emitted to the underlying `LiftoffAssembler` only at the
// end via `Execute` or implicitly in the destructor.
class ParallelMove { … };

}  // namespace v8::internal::wasm

#endif  // V8_WASM_BASELINE_PARALLEL_MOVE_H_