src/third_party/zlib/crc32_simd.h

/* crc32_simd.h
 *
 * Copyright 2017 The Chromium Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be
 * found in the Chromium source repository LICENSE file.
 */

#include <stdint.h>

#include "zconf.h"
#include "zutil.h"
#include "deflate.h"

/*
 * crc32_sse42_simd_(): compute the crc32 of the buffer, where the buffer
 * length must be at least 64, and a multiple of 16.
 */
uint32_t ZLIB_INTERNAL crc32_sse42_simd_(
    const unsigned char *buf,
    z_size_t len,
    uint32_t crc);

/*
 * crc32_sse42_simd_ buffer size constraints: see the use in zlib/crc32.c
 * for computing the crc32 of an arbitrary length buffer.
 */
#define Z_CRC32_SSE42_MINIMUM_LENGTH 64
#define Z_CRC32_SSE42_CHUNKSIZE_MASK 15

/*
 * CRC32 checksums using ARMv8-a crypto instructions.
 */
uint32_t ZLIB_INTERNAL armv8_crc32_little(unsigned long crc,
                                          const unsigned char* buf,
                                          z_size_t len);

/*
 * Insert hash string.
 */
Pos ZLIB_INTERNAL insert_string_arm(deflate_state *const s, const Pos str);