text: #ifndef TARANTOOL_CPU_FEATURES_H
  #define TARANTOOL_CPU_FEATURES_H
  /*
   * Copyright 2010-2015, Tarantool AUTHORS, please see AUTHORS file.
   *
   * Redistribution and use in source and binary forms, with or
   * without modification, are permitted provided that the following
   * conditions are met:
   *
   * 1. Redistributions of source code must retain the above
   *    copyright notice, this list of conditions and the
   *    following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above
   *    copyright notice, this list of conditions and the following
   *    disclaimer in the documentation and/or other materials
   *    provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY <COPYRIGHT HOLDER> ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
   * <COPYRIGHT HOLDER> OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
   * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
   * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
   * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  #include <sys/types.h>
  #include <stdbool.h>
  #include <stdint.h>
  
  /* Check whether CPU supports SSE 4.2 (needed to compute CRC32 in hardware).
   *
   * @param	feature		indetifier (see above) of the target feature
   *
   * @return	true if feature is available, false if unavailable.
   */
  bool sse42_enabled_cpu();
  
  #if defined (__x86_64__) || defined (__i386__)
  /* Hardware-calculate CRC32 for the given data buffer.
   *
   * @param	crc 		initial CRC
   * @param	buf			data buffer
   * @param	len			buffer length
   *
   * @pre 	true == cpu_has (cpuf_sse4_2)
   * @return	CRC32 value
   */
  uint32_t crc32c_hw(uint32_t crc, const char *buf, unsigned int len);
  #endif
  
  #endif /* TARANTOOL_CPU_FEATURES_H */
  
  