chromium/third_party/abseil-cpp/absl/crc/internal/crc_memcpy_fallback.cc

// Copyright 2022 The Abseil Authors
//
// 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
//
//     https://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 <cstring>
#include <memory>

#include "absl/base/config.h"
#include "absl/crc/crc32c.h"
#include "absl/crc/internal/crc_memcpy.h"
#include "absl/strings/string_view.h"

namespace absl {
ABSL_NAMESPACE_BEGIN
namespace crc_internal {

absl::crc32c_t FallbackCrcMemcpyEngine::Compute(void* __restrict dst,
                                                const void* __restrict src,
                                                std::size_t length,
                                                crc32c_t initial_crc) const { … }

// Compile the following only if we don't have
#if !defined(ABSL_INTERNAL_HAVE_X86_64_ACCELERATED_CRC_MEMCPY_ENGINE) && \
    !defined(ABSL_INTERNAL_HAVE_ARM_ACCELERATED_CRC_MEMCPY_ENGINE)

CrcMemcpy::ArchSpecificEngines CrcMemcpy::GetArchSpecificEngines() { … }

std::unique_ptr<CrcMemcpyEngine> CrcMemcpy::GetTestEngine(int /*vector*/,
                                                          int /*integer*/) { … }

#endif  // !ABSL_INTERNAL_HAVE_X86_64_ACCELERATED_CRC_MEMCPY_ENGINE &&
        // !ABSL_INTERNAL_HAVE_ARM_ACCELERATED_CRC_MEMCPY_ENGINE

}  // namespace crc_internal
ABSL_NAMESPACE_END
}  // namespace absl