string/test-memset.c

   1 /* Test and measure memset functions.
   2    Copyright (C) 1999, 2002 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Written by Jakub Jelinek <jakub@redhat.com>, 1999.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #define TEST_MAIN
  22 #define MIN_PAGE_SIZE 131072
  23 #include "test-string.h"
  24
  25 typedef char *(*proto_t) (char *, int, size_t);
  26 char *simple_memset (char *, int, size_t);
  27 char *builtin_memset (char *, int, size_t);
  28
  29 IMPL (simple_memset, 0)
  30 IMPL (builtin_memset, 0)
  31 IMPL (memset, 1)
  32
  33 char *
  34 simple_memset (char *s, int c, size_t n)
  35 {
  36   char *r = s, *end = s + n;
  37   while (r < end)
  38     *r++ = c;
  39   return s;
  40 }
  41
  42 char *
  43 builtin_memset (char *s, int c, size_t n)
  44 {
  45   return __builtin_memset (s, c, n);
  46 }
  47
  48 static void
  49 do_one_test (impl_t *impl, char *s, int c, size_t n)
  50 {
  51   char *res = CALL (impl, s, c, n);
  52   if (res != s)
  53     {
  54       error (0, 0, "Wrong result in function %s %p != %p", impl->name,
  55              res, s);
  56       ret = 1;
  57       return;
  58     }
  59
  60   if (HP_TIMING_AVAIL)
  61     {
  62       hp_timing_t start, stop, best_time = ~ (hp_timing_t) 0;
  63       size_t i;
  64
  65       for (i = 0; i < 32; ++i)
  66         {
  67           HP_TIMING_NOW (start);
  68           CALL (impl, s, c, n);
  69           HP_TIMING_NOW (stop);
  70           HP_TIMING_BEST (best_time, start, stop);
  71         }
  72
  73       printf ("\t%zd", (size_t) best_time);
  74     }
  75 }
  76
  77 static void
  78 do_test (size_t align, int c, size_t len)
  79 {
  80   align &= 7;
  81   if (align + len > page_size)
  82     return;
  83
  84   if (HP_TIMING_AVAIL)
  85     printf ("Length %4zd, alignment %2zd, c %2d:", len, align, c);
  86
  87   FOR_EACH_IMPL (impl, 0)
  88     do_one_test (impl, buf1 + align, c, len);
  89
  90   if (HP_TIMING_AVAIL)
  91     putchar ('\n');
  92 }
  93
  94 static void
  95 do_random_tests (void)
  96 {
  97   size_t i, j, k, n, align, len, size;
  98   int c, o;
  99   unsigned char *p, *res;
 100
 101   for (i = 0; i < 65536; ++i)
 102     buf2[i] = random () & 255;
 103
 104   for (n = 0; n < ITERATIONS; n++)
 105     {
 106       if ((random () & 31) == 0)
 107         size = 65536;
 108       else
 109         size = 512;
 110       p = buf1 + page_size - size;
 111       len = random () & (size - 1);
 112       align = size - len - (random () & 31);
 113       if (align > size)
 114         align = size - len;
 115       if ((random () & 7) == 0)
 116         align &= ~63;
 117       if ((random () & 7) == 0)
 118         c = 0;
 119       else
 120         c = random () & 255;
 121       o = random () & 255;
 122       if (o == c)
 123         o = (c + 1) & 255;
 124       j = len + align + 128;
 125       if (j > size)
 126         j = size;
 127       if (align >= 128)
 128         k = align - 128;
 129       else
 130         k = 0;
 131       for (i = k; i < align; ++i)
 132         p[i] = o;
 133       for (i = align + len; i < j; ++i)
 134         p[i] = o;
 135
 136       FOR_EACH_IMPL (impl, 1)
 137         {
 138           for (i = 0; i < len; ++i)
 139             {
 140               p[i + align] = buf2[i];
 141               if (p[i + align] == c)
 142                 p[i + align] = o;
 143             }
 144           res = CALL (impl, p + align, c, len);
 145           if (res != p + align)
 146             {
 147               error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %d, %zd) %p != %p",
 148                      n, impl->name, align, c, len, res, p + align);
 149               ret = 1;
 150             }
 151           for (i = k; i < align; ++i)
 152             if (p[i] != o)
 153               {
 154                 error (0, 0, "Iteration %zd - garbage before %s (%zd, %d, %zd)",
 155                        n, impl->name, align, c, len);
 156                 ret = 1;
 157                 break;
 158               }
 159           for (; i < align + len; ++i)
 160             if (p[i] != c)
 161               {
 162                 error (0, 0, "Iteration %zd - not cleared correctly %s (%zd, %d, %zd)",
 163                        n, impl->name, align, c, len);
 164                 ret = 1;
 165                 break;
 166               }
 167           for (; i < j; ++i)
 168             if (p[i] != o)
 169               {
 170                 error (0, 0, "Iteration %zd - garbage after %s (%zd, %d, %zd)",
 171                        n, impl->name, align, c, len);
 172                 ret = 1;
 173                 break;
 174               }
 175         }
 176     }
 177 }
 178
 179 int
 180 test_main (void)
 181 {
 182   size_t i;
 183   int c;
 184
 185   test_init ();
 186
 187   printf ("%24s", "");
 188   FOR_EACH_IMPL (impl, 0)
 189     printf ("\t%s", impl->name);
 190   putchar ('\n');
 191
 192   for (c = 0; c <= 65; c += 65)
 193     {
 194       for (i = 0; i < 18; ++i)
 195         do_test (0, c, 1 << i);
 196       for (i = 1; i < 32; ++i)
 197         {
 198           do_test (i, c, i);
 199           if (i & (i - 1))
 200             do_test (0, c, i);
 201         }
 202       do_test (1, c, 14);
 203       do_test (3, c, 1024);
 204       do_test (4, c, 64);
 205       do_test (2, c, 25);
 206     }
 207
 208   do_random_tests ();
 209   return ret;
 210 }
 211
 212 #include "../test-skeleton.c"