glibc/string/test-memset.c

/* Test and measure memset functions.
   Copyright (C) 1999, 2002, 2003, 2005 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Written by Jakub Jelinek <jakub@redhat.com>, 1999.

   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/>.  */

#define TEST_MAIN
#define MIN_PAGE_SIZE 131072
#include "test-string.h"

typedef char *(*proto_t) (char *, int, size_t);
char *simple_memset (char *, int, size_t);
char *builtin_memset (char *, int, size_t);

IMPL (simple_memset, 0)
IMPL (builtin_memset, 0)
IMPL (memset, 1)

char *
simple_memset (char *s, int c, size_t n)
{
  char *r = s, *end = s + n;
  while (r < end)
    *r++ = c;
  return s;
}

char *
builtin_memset (char *s, int c, size_t n)
{
  return __builtin_memset (s, c, n);
}

static void
do_one_test (impl_t *impl, char *s, int c, size_t n)
{
  char *res = CALL (impl, s, c, n);
  char tstbuf[n];
  if (res != s
      || simple_memset (tstbuf, c, n) != tstbuf
      || memcmp (s, tstbuf, n) != 0)
    {
      error (0, 0, "Wrong result in function %s", impl->name);
      ret = 1;
      return;
    }

  if (HP_TIMING_AVAIL)
    {
      hp_timing_t start __attribute ((unused));
      hp_timing_t stop __attribute ((unused));
      hp_timing_t best_time = ~ (hp_timing_t) 0;
      size_t i;

      for (i = 0; i < 32; ++i)
	{
	  HP_TIMING_NOW (start);
	  CALL (impl, s, c, n);
	  HP_TIMING_NOW (stop);
	  HP_TIMING_BEST (best_time, start, stop);
	}

      printf ("\t%zd", (size_t) best_time);
    }
}

static void
do_test (size_t align, int c, size_t len)
{
  align &= 7;
  if (align + len > page_size)
    return;

  if (HP_TIMING_AVAIL)
    printf ("Length %4zd, alignment %2zd, c %2d:", len, align, c);

  FOR_EACH_IMPL (impl, 0)
    do_one_test (impl, (char *) buf1 + align, c, len);

  if (HP_TIMING_AVAIL)
    putchar ('\n');
}

static void
do_random_tests (void)
{
  size_t i, j, k, n, align, len, size;
  int c, o;
  unsigned char *p, *res;

  for (i = 0; i < 65536; ++i)
    buf2[i] = random () & 255;

  for (n = 0; n < ITERATIONS; n++)
    {
      if ((random () & 31) == 0)
	size = 65536;
      else
	size = 512;
      p = buf1 + page_size - size;
      len = random () & (size - 1);
      align = size - len - (random () & 31);
      if (align > size)
	align = size - len;
      if ((random () & 7) == 0)
	align &= ~63;
      if ((random () & 7) == 0)
	c = 0;
      else
	c = random () & 255;
      o = random () & 255;
      if (o == c)
        o = (c + 1) & 255;
      j = len + align + 128;
      if (j > size)
	j = size;
      if (align >= 128)
	k = align - 128;
      else
	k = 0;
      for (i = k; i < align; ++i)
	p[i] = o;
      for (i = align + len; i < j; ++i)
	p[i] = o;

      FOR_EACH_IMPL (impl, 1)
	{
	  for (i = 0; i < len; ++i)
	    {
	      p[i + align] = buf2[i];
	      if (p[i + align] == c)
		p[i + align] = o;
	    }
	  res = (unsigned char *) CALL (impl, (char *) p + align, c, len);
	  if (res != p + align)
	    {
	      error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %d, %zd) %p != %p",
		     n, impl->name, align, c, len, res, p + align);
	      ret = 1;
	    }
	  for (i = k; i < align; ++i)
	    if (p[i] != o)
	      {
		error (0, 0, "Iteration %zd - garbage before %s (%zd, %d, %zd)",
		       n, impl->name, align, c, len);
		ret = 1;
		break;
	      }
	  for (; i < align + len; ++i)
	    if (p[i] != c)
	      {
		error (0, 0, "Iteration %zd - not cleared correctly %s (%zd, %d, %zd)",
		       n, impl->name, align, c, len);
		ret = 1;
		break;
	      }
	  for (; i < j; ++i)
	    if (p[i] != o)
	      {
		error (0, 0, "Iteration %zd - garbage after %s (%zd, %d, %zd)",
		       n, impl->name, align, c, len);
		ret = 1;
		break;
	      }
	}
    }
}

int
test_main (void)
{
  size_t i;
  int c;

  test_init ();

  printf ("%24s", "");
  FOR_EACH_IMPL (impl, 0)
    printf ("\t%s", impl->name);
  putchar ('\n');

  for (c = -65; c <= 130; c += 65)
    {
      for (i = 0; i < 18; ++i)
	do_test (0, c, 1 << i);
      for (i = 1; i < 32; ++i)
	{
	  do_test (i, c, i);
	  if (i & (i - 1))
	    do_test (0, c, i);
	}
      do_test (1, c, 14);
      do_test (3, c, 1024);
      do_test (4, c, 64);
      do_test (2, c, 25);
    }

  do_random_tests ();
  return ret;
}

#include "../test-skeleton.c"