glibc/benchtests/bench-strspn.c

/* Measure strspn functions.
   Copyright (C) 2013-2021 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
   <https://www.gnu.org/licenses/>.  */

#define TEST_MAIN
#ifndef WIDE
# define TEST_NAME "strspn"
#else
# define TEST_NAME "wcsspn"
#endif /* WIDE */
#include "bench-string.h"

#define BIG_CHAR MAX_CHAR

#ifndef WIDE
# define SIMPLE_STRSPN simple_strspn
# define SMALL_CHAR 127
#else
# define SIMPLE_STRSPN simple_wcsspn
# define SMALL_CHAR 1273
#endif /* WIDE */

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

IMPL (SIMPLE_STRSPN, 0)
IMPL (STRSPN, 1)

size_t
SIMPLE_STRSPN (const CHAR *s, const CHAR *acc)
{
  const CHAR *r, *str = s;
  CHAR c;

  while ((c = *s++) != '\0')
    {
      for (r = acc; *r != '\0'; ++r)
	if (*r == c)
	  break;
      if (*r == '\0')
	return s - str - 1;
    }
  return s - str - 1;
}

static void
do_one_test (impl_t *impl, const CHAR *s, const CHAR *acc, size_t exp_res)
{
  size_t res = CALL (impl, s, acc), i, iters = INNER_LOOP_ITERS_MEDIUM;
  timing_t start, stop, cur;

  if (res != exp_res)
    {
      error (0, 0, "Wrong result in function %s %p %p", impl->name,
	     (void *) res, (void *) exp_res);
      ret = 1;
      return;
    }

  TIMING_NOW (start);
  for (i = 0; i < iters; ++i)
    {
      CALL (impl, s, acc);
    }
  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)
{
  size_t i;
  CHAR *acc, *s;

  align &= 7;
  if ((align + pos + 10) * sizeof (CHAR) >= page_size || len > 240 || ! len)
    return;

  acc = (CHAR *) (buf2) + (random () & 255);
  s = (CHAR *) (buf1) + align;

  for (i = 0; i < len; ++i)
    {
      acc[i] = random () & BIG_CHAR;
      if (!acc[i])
	acc[i] = random () & BIG_CHAR;
      if (!acc[i])
	acc[i] = 1 + (random () & SMALL_CHAR);
    }
  acc[len] = '\0';

  for (i = 0; i < pos; ++i)
    s[i] = acc[random () % len];
  s[pos] = random () & BIG_CHAR;
  if (STRCHR (acc, s[pos]))
    s[pos] = '\0';
  else
    {
      for (i = pos + 1; i < pos + 10; ++i)
	s[i] = random () & BIG_CHAR;
      s[i] = '\0';
    }

  printf ("Length %4zd, alignment %2zd, acc len %2zd:", pos, align, len);

  FOR_EACH_IMPL (impl, 0)
    do_one_test (impl, s, acc, pos);

  putchar ('\n');
}

int
test_main (void)
{
  size_t i;

  test_init ();

  printf ("%32s", "");
  FOR_EACH_IMPL (impl, 0)
    printf ("\t%s", impl->name);
  putchar ('\n');

  for (i = 0; i < 32; ++i)
    {
      do_test (0, 512, i);
      do_test (i, 512, i);
    }

  for (i = 1; i < 8; ++i)
    {
      do_test (0, 16 << i, 4);
      do_test (i, 16 << i, 4);
    }

  for (i = 1; i < 8; ++i)
    do_test (i, 64, 10);

  for (i = 0; i < 64; ++i)
    do_test (0, i, 6);

  return ret;
}

#include <support/test-driver.c>