/* Measure memchr functions.

   Copyright (C) 2013-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#ifndef WIDE

# define CHAR char

# define SMALL_CHAR 127

#else

# include <wchar.h>

# define CHAR wchar_t

# define SMALL_CHAR 1273

#endif /* WIDE */

#ifndef USE_AS_MEMRCHR

# define TEST_MAIN

# ifndef WIDE

#  define TEST_NAME "memchr"

# else

#  define TEST_NAME "wmemchr"

# endif /* WIDE */

# include "bench-string.h"

# ifndef WIDE

#  define MEMCHR memchr

#  define SIMPLE_MEMCHR simple_memchr

# else

#  define MEMCHR wmemchr

#  define SIMPLE_MEMCHR simple_wmemchr

# endif /* WIDE */

typedef CHAR *(*proto_t) (const CHAR *, int, size_t);

CHAR *SIMPLE_MEMCHR (const CHAR *, int, size_t);

IMPL (SIMPLE_MEMCHR, 0)

IMPL (MEMCHR, 1)

CHAR *

SIMPLE_MEMCHR (const CHAR *s, int c, size_t n)

{

  while (n--)

    if (*s++ == (CHAR) c)

      return (CHAR *) s - 1;

  return NULL;

}

#endif /* !USE_AS_MEMRCHR */

static void

do_one_test (impl_t *impl, const CHAR *s, int c, size_t n)

{

  size_t i, iters = INNER_LOOP_ITERS;

  timing_t start, stop, cur;

  TIMING_NOW (start);

  for (i = 0; i < iters; ++i)

    {

      CALL (impl, s, c, n);

    }

  TIMING_NOW (stop);

  TIMING_DIFF (cur, start, stop);

  TIMING_PRINT_MEAN ((double) cur, (double) iters);

}

static void

do_test (size_t align, size_t pos, size_t len, int seek_char)

{

  size_t i;

  align &= 7;

  if ((align + len) * sizeof (CHAR) >= page_size)

    return;

  CHAR *buf = (CHAR *) (buf1);

  for (i = 0; i < len; ++i)

    {

      buf[align + i] = 1 + 23 * i % SMALL_CHAR;

      if (buf[align + i] == seek_char)

	buf[align + i] = seek_char + 1;

    }

  buf[align + len] = 0;

  if (pos < len)

    {

      buf[align + pos] = seek_char;

      buf[align + len] = -seek_char;

    }

  else

    {

      buf[align + len] = seek_char;

    }

  printf ("Length %4zd, position %4zd, alignment %2zd:",

	  len, pos, align);

  FOR_EACH_IMPL (impl, 0)

    do_one_test (impl, (CHAR *) (buf + align), seek_char, len);

  putchar ('\n');

}

int

test_main (void)

{

  size_t i;

  test_init ();

  printf ("%20s", "");

  FOR_EACH_IMPL (impl, 0)

    printf ("\t%s", impl->name);

  putchar ('\n');

  for (i = 1; i < 8; ++i)

    {

      do_test (0, 16 << i, 2048, 23);

      do_test (i, 64, 256, 23);

      do_test (0, 16 << i, 2048, 0);

      do_test (i, 64, 256, 0);

#ifdef USE_AS_MEMRCHR

      /* Also test the position close to the beginning for memrchr.  */

      do_test (0, i, 256, 23);

      do_test (0, i, 256, 0);

      do_test (i, i, 256, 23);

      do_test (i, i, 256, 0);

#endif

    }

  for (i = 1; i < 32; ++i)

    {

      do_test (0, i, i + 1, 23);

      do_test (0, i, i + 1, 0);

      do_test (i, i, i + 1, 23);

      do_test (i, i, i + 1, 0);

#ifdef USE_AS_MEMRCHR

      /* Also test the position close to the beginning for memrchr.  */

      do_test (0, 1, i + 1, 23);

      do_test (0, 2, i + 1, 0);

#endif

    }

  return ret;

}

#include <support/test-driver.c>