glibc/benchtests/bench-strcasecmp.c

/* Measure strcasecmp functions.
   Copyright (C) 2013-2019 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/>.  */

#include <ctype.h>
#define TEST_MAIN
#define TEST_NAME "strcasecmp"
#include "bench-string.h"

typedef int (*proto_t) (const char *, const char *);
static int simple_strcasecmp (const char *, const char *);
static int stupid_strcasecmp (const char *, const char *);

IMPL (stupid_strcasecmp, 0)
IMPL (simple_strcasecmp, 0)
IMPL (strcasecmp, 1)

static int
simple_strcasecmp (const char *s1, const char *s2)
{
  int ret;

  while ((ret = ((unsigned char) tolower (*s1)
		 - (unsigned char) tolower (*s2))) == 0
	 && *s1++)
    ++s2;
  return ret;
}

static int
stupid_strcasecmp (const char *s1, const char *s2)
{
  size_t ns1 = strlen (s1) + 1, ns2 = strlen (s2) + 1;
  size_t n = ns1 < ns2 ? ns1 : ns2;
  int ret = 0;

  while (n--)
    {
      if ((ret = ((unsigned char) tolower (*s1)
		  - (unsigned char) tolower (*s2))) != 0)
	break;
      ++s1;
      ++s2;
    }
  return ret;
}

static void
do_one_test (impl_t *impl, const char *s1, const char *s2, int exp_result)
{
  size_t i, iters = INNER_LOOP_ITERS;
  timing_t start, stop, cur;
  int result = CALL (impl, s1, s2);
  if ((exp_result == 0 && result != 0)
      || (exp_result < 0 && result >= 0)
      || (exp_result > 0 && result <= 0))
    {
      error (0, 0, "Wrong result in function %s %d %d", impl->name,
	     result, exp_result);
      ret = 1;
      return;
    }

  TIMING_NOW (start);
  for (i = 0; i < iters; ++i)
    {
      CALL (impl, s1, s2);
    }
  TIMING_NOW (stop);

  TIMING_DIFF (cur, start, stop);

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

static void
do_test (size_t align1, size_t align2, size_t len, int max_char,
	 int exp_result)
{
  size_t i;
  char *s1, *s2;

  if (len == 0)
    return;

  align1 &= 7;
  if (align1 + len + 1 >= page_size)
    return;

  align2 &= 7;
  if (align2 + len + 1 >= page_size)
    return;

  s1 = (char *) (buf1 + align1);
  s2 = (char *) (buf2 + align2);

  for (i = 0; i < len; i++)
    {
      s1[i] = toupper (1 + 23 * i % max_char);
      s2[i] = tolower (s1[i]);
    }

  s1[len] = s2[len] = 0;
  s1[len + 1] = 23;
  s2[len + 1] = 24 + exp_result;
  if ((s2[len - 1] == 'z' && exp_result == -1)
      || (s2[len - 1] == 'a' && exp_result == 1))
    s1[len - 1] += exp_result;
  else
    s2[len - 1] -= exp_result;

  printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);

  FOR_EACH_IMPL (impl, 0)
    do_one_test (impl, s1, s2, exp_result);

  putchar ('\n');
}

int
test_main (void)
{
  size_t i;

  test_init ();

  printf ("%23s", "");
  FOR_EACH_IMPL (impl, 0)
    printf ("\t%s", impl->name);
  putchar ('\n');

  for (i = 1; i < 16; ++i)
    {
      do_test (i, i, i, 127, 0);
      do_test (i, i, i, 127, 1);
      do_test (i, i, i, 127, -1);
    }

  for (i = 1; i < 10; ++i)
    {
      do_test (0, 0, 2 << i, 127, 0);
      do_test (0, 0, 2 << i, 254, 0);
      do_test (0, 0, 2 << i, 127, 1);
      do_test (0, 0, 2 << i, 254, 1);
      do_test (0, 0, 2 << i, 127, -1);
      do_test (0, 0, 2 << i, 254, -1);
    }

  for (i = 1; i < 8; ++i)
    {
      do_test (i, 2 * i, 8 << i, 127, 0);
      do_test (2 * i, i, 8 << i, 254, 0);
      do_test (i, 2 * i, 8 << i, 127, 1);
      do_test (2 * i, i, 8 << i, 254, 1);
      do_test (i, 2 * i, 8 << i, 127, -1);
      do_test (2 * i, i, 8 << i, 254, -1);
    }

  return ret;
}

#include <support/test-driver.c>