string/test-memset.c

   1 /* Test and measure memset functions.
   2    Copyright (C) 1999, 2002, 2003, 2005 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   char tstbuf[n];
  53   if (res != s
  54       || simple_memset (tstbuf, c, n) != tstbuf
  55       || memcmp (s, tstbuf, n) != 0)
  56     {
  57       error (0, 0, "Wrong result in function %s", impl->name);
  58       ret = 1;
  59       return;
  60     }
  61
  62   if (HP_TIMING_AVAIL)
  63     {
  64       hp_timing_t start __attribute ((unused));
  65       hp_timing_t stop __attribute ((unused));
  66       hp_timing_t best_time = ~ (hp_timing_t) 0;
  67       size_t i;
  68
  69       for (i = 0; i < 32; ++i)
  70         {
  71           HP_TIMING_NOW (start);
  72           CALL (impl, s, c, n);
  73           HP_TIMING_NOW (stop);
  74           HP_TIMING_BEST (best_time, start, stop);
  75         }
  76
  77       printf ("\t%zd", (size_t) best_time);
  78     }
  79 }
  80
  81 static void
  82 do_test (size_t align, int c, size_t len)
  83 {
  84   align &= 7;
  85   if (align + len > page_size)
  86     return;
  87
  88   if (HP_TIMING_AVAIL)
  89     printf ("Length %4zd, alignment %2zd, c %2d:", len, align, c);
  90
  91   FOR_EACH_IMPL (impl, 0)
  92     do_one_test (impl, (char *) buf1 + align, c, len);
  93
  94   if (HP_TIMING_AVAIL)
  95     putchar ('\n');
  96 }
  97
  98 static void
  99 do_random_tests (void)
 100 {
 101   size_t i, j, k, n, align, len, size;
 102   int c, o;
 103   unsigned char *p, *res;
 104
 105   for (i = 0; i < 65536; ++i)
 106     buf2[i] = random () & 255;
 107
 108   for (n = 0; n < ITERATIONS; n++)
 109     {
 110       if ((random () & 31) == 0)
 111         size = 65536;
 112       else
 113         size = 512;
 114       p = buf1 + page_size - size;
 115       len = random () & (size - 1);
 116       align = size - len - (random () & 31);
 117       if (align > size)
 118         align = size - len;
 119       if ((random () & 7) == 0)
 120         align &= ~63;
 121       if ((random () & 7) == 0)
 122         c = 0;
 123       else
 124         c = random () & 255;
 125       o = random () & 255;
 126       if (o == c)
 127         o = (c + 1) & 255;
 128       j = len + align + 128;
 129       if (j > size)
 130         j = size;
 131       if (align >= 128)
 132         k = align - 128;
 133       else
 134         k = 0;
 135       for (i = k; i < align; ++i)
 136         p[i] = o;
 137       for (i = align + len; i < j; ++i)
 138         p[i] = o;
 139
 140       FOR_EACH_IMPL (impl, 1)
 141         {
 142           for (i = 0; i < len; ++i)
 143             {
 144               p[i + align] = buf2[i];
 145               if (p[i + align] == c)
 146                 p[i + align] = o;
 147             }
 148           res = (unsigned char *) CALL (impl, (char *) p + align, c, len);
 149           if (res != p + align)
 150             {
 151               error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %d, %zd) %p != %p",
 152                      n, impl->name, align, c, len, res, p + align);
 153               ret = 1;
 154             }
 155           for (i = k; i < align; ++i)
 156             if (p[i] != o)
 157               {
 158                 error (0, 0, "Iteration %zd - garbage before %s (%zd, %d, %zd)",
 159                        n, impl->name, align, c, len);
 160                 ret = 1;
 161                 break;
 162               }
 163           for (; i < align + len; ++i)
 164             if (p[i] != c)
 165               {
 166                 error (0, 0, "Iteration %zd - not cleared correctly %s (%zd, %d, %zd)",
 167                        n, impl->name, align, c, len);
 168                 ret = 1;
 169                 break;
 170               }
 171           for (; i < j; ++i)
 172             if (p[i] != o)
 173               {
 174                 error (0, 0, "Iteration %zd - garbage after %s (%zd, %d, %zd)",
 175                        n, impl->name, align, c, len);
 176                 ret = 1;
 177                 break;
 178               }
 179         }
 180     }
 181 }
 182
 183 int
 184 test_main (void)
 185 {
 186   size_t i;
 187   int c;
 188
 189   test_init ();
 190
 191   printf ("%24s", "");
 192   FOR_EACH_IMPL (impl, 0)
 193     printf ("\t%s", impl->name);
 194   putchar ('\n');
 195
 196   for (c = -65; c <= 130; c += 65)
 197     {
 198       for (i = 0; i < 18; ++i)
 199         do_test (0, c, 1 << i);
 200       for (i = 1; i < 32; ++i)
 201         {
 202           do_test (i, c, i);
 203           if (i & (i - 1))
 204             do_test (0, c, i);
 205         }
 206       do_test (1, c, 14);
 207       do_test (3, c, 1024);
 208       do_test (4, c, 64);
 209       do_test (2, c, 25);
 210     }
 211
 212   do_random_tests ();
 213   return ret;
 214 }
 215
 216 #include "../test-skeleton.c"