chromium/v8/src/wasm/simd-shuffle.h

// Copyright 2020 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.

#if !V8_ENABLE_WEBASSEMBLY
#error This header should only be included if WebAssembly is enabled.
#endif  // !V8_ENABLE_WEBASSEMBLY

#ifndef V8_WASM_SIMD_SHUFFLE_H_
#define V8_WASM_SIMD_SHUFFLE_H_

#include "src/base/macros.h"
#include "src/common/globals.h"
#include "src/compiler/backend/instruction-codes.h"

namespace v8 {
namespace internal {
namespace wasm {

#ifdef V8_TARGET_ARCH_X64
template <int simd_size,
          typename = std::enable_if_t<simd_size == kSimd128Size ||
                                      simd_size == kSimd256Size>>
struct ShuffleEntry {};
template <>
struct ShuffleEntry<kSimd128Size> {
  uint8_t shuffle[kSimd128Size];
  compiler::ArchOpcode opcode;
  bool src0_needs_reg;
  bool src1_needs_reg;
  // If AVX is supported, this shuffle can use AVX's three-operand encoding,
  // so does not require same as first. We conservatively set this to false
  // (original behavior), and selectively enable for specific arch shuffles.
  bool no_same_as_first_if_avx;
};

template <>
struct ShuffleEntry<kSimd256Size> {
  uint8_t shuffle[kSimd256Size];
  compiler::ArchOpcode opcode;
};
#endif  // V8_TARGET_ARCH_X64

class V8_EXPORT_PRIVATE SimdShuffle { … };

class V8_EXPORT_PRIVATE SimdSwizzle { … };

}  // namespace wasm
}  // namespace internal
}  // namespace v8

#endif  // V8_WASM_SIMD_SHUFFLE_H_