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, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #define TEST_MAIN
  21 #define MIN_PAGE_SIZE 131072
  22 #include "test-string.h"
  23
  24 typedef char *(*proto_t) (char *, int, size_t);
  25 char *simple_memset (char *, int, size_t);
  26 char *builtin_memset (char *, int, size_t);
  27
  28 IMPL (simple_memset, 0)
  29 IMPL (builtin_memset, 0)
  30 IMPL (memset, 1)
  31
  32 char *
  33 simple_memset (char *s, int c, size_t n)
  34 {
  35   char *r = s, *end = s + n;
  36   while (r < end)
  37     *r++ = c;
  38   return s;
  39 }
  40
  41 char *
  42 builtin_memset (char *s, int c, size_t n)
  43 {
  44   return __builtin_memset (s, c, n);
  45 }
  46
  47 static void
  48 do_one_test (impl_t *impl, char *s, int c, size_t n)
  49 {
  50   char *res = CALL (impl, s, c, n);
  51   char tstbuf[n];
  52   if (res != s
  53       || simple_memset (tstbuf, c, n) != tstbuf
  54       || memcmp (s, tstbuf, n) != 0)
  55     {
  56       error (0, 0, "Wrong result in function %s", impl->name);
  57       ret = 1;
  58       return;
  59     }
  60
  61   if (HP_TIMING_AVAIL)
  62     {
  63       hp_timing_t start __attribute ((unused));
  64       hp_timing_t stop __attribute ((unused));
  65       hp_timing_t best_time = ~ (hp_timing_t) 0;
  66       size_t i;
  67
  68       for (i = 0; i < 32; ++i)
  69         {
  70           HP_TIMING_NOW (start);
  71           CALL (impl, s, c, n);
  72           HP_TIMING_NOW (stop);
  73           HP_TIMING_BEST (best_time, start, stop);
  74         }
  75
  76       printf ("\t%zd", (size_t) best_time);
  77     }
  78 }
  79
  80 static void
  81 do_test (size_t align, int c, size_t len)
  82 {
  83   align &= 7;
  84   if (align + len > page_size)
  85     return;
  86
  87   if (HP_TIMING_AVAIL)
  88     printf ("Length %4zd, alignment %2zd, c %2d:", len, align, c);
  89
  90   FOR_EACH_IMPL (impl, 0)
  91     do_one_test (impl, (char *) buf1 + align, c, len);
  92
  93   if (HP_TIMING_AVAIL)
  94     putchar ('\n');
  95 }
  96
  97 static void
  98 do_random_tests (void)
  99 {
 100   size_t i, j, k, n, align, len, size;
 101   int c, o;
 102   unsigned char *p, *res;
 103
 104   for (i = 0; i < 65536; ++i)
 105     buf2[i] = random () & 255;
 106
 107   for (n = 0; n < ITERATIONS; n++)
 108     {
 109       if ((random () & 31) == 0)
 110         size = 65536;
 111       else
 112         size = 512;
 113       p = buf1 + page_size - size;
 114       len = random () & (size - 1);
 115       align = size - len - (random () & 31);
 116       if (align > size)
 117         align = size - len;
 118       if ((random () & 7) == 0)
 119         align &= ~63;
 120       if ((random () & 7) == 0)
 121         c = 0;
 122       else
 123         c = random () & 255;
 124       o = random () & 255;
 125       if (o == c)
 126         o = (c + 1) & 255;
 127       j = len + align + 128;
 128       if (j > size)
 129         j = size;
 130       if (align >= 128)
 131         k = align - 128;
 132       else
 133         k = 0;
 134       for (i = k; i < align; ++i)
 135         p[i] = o;
 136       for (i = align + len; i < j; ++i)
 137         p[i] = o;
 138
 139       FOR_EACH_IMPL (impl, 1)
 140         {
 141           for (i = 0; i < len; ++i)
 142             {
 143               p[i + align] = buf2[i];
 144               if (p[i + align] == c)
 145                 p[i + align] = o;
 146             }
 147           res = (unsigned char *) CALL (impl, (char *) p + align, c, len);
 148           if (res != p + align)
 149             {
 150               error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %d, %zd) %p != %p",
 151                      n, impl->name, align, c, len, res, p + align);
 152               ret = 1;
 153             }
 154           for (i = k; i < align; ++i)
 155             if (p[i] != o)
 156               {
 157                 error (0, 0, "Iteration %zd - garbage before %s (%zd, %d, %zd)",
 158                        n, impl->name, align, c, len);
 159                 ret = 1;
 160                 break;
 161               }
 162           for (; i < align + len; ++i)
 163             if (p[i] != c)
 164               {
 165                 error (0, 0, "Iteration %zd - not cleared correctly %s (%zd, %d, %zd)",
 166                        n, impl->name, align, c, len);
 167                 ret = 1;
 168                 break;
 169               }
 170           for (; i < j; ++i)
 171             if (p[i] != o)
 172               {
 173                 error (0, 0, "Iteration %zd - garbage after %s (%zd, %d, %zd)",
 174                        n, impl->name, align, c, len);
 175                 ret = 1;
 176                 break;
 177               }
 178         }
 179     }
 180 }
 181
 182 int
 183 test_main (void)
 184 {
 185   size_t i;
 186   int c;
 187
 188   test_init ();
 189
 190   printf ("%24s", "");
 191   FOR_EACH_IMPL (impl, 0)
 192     printf ("\t%s", impl->name);
 193   putchar ('\n');
 194
 195   for (c = -65; c <= 130; c += 65)
 196     {
 197       for (i = 0; i < 18; ++i)
 198         do_test (0, c, 1 << i);
 199       for (i = 1; i < 32; ++i)
 200         {
 201           do_test (i, c, i);
 202           if (i & (i - 1))
 203             do_test (0, c, i);
 204         }
 205       do_test (1, c, 14);
 206       do_test (3, c, 1024);
 207       do_test (4, c, 64);
 208       do_test (2, c, 25);
 209     }
 210
 211   do_random_tests ();
 212   return ret;
 213 }
 214
 215 #include "../test-skeleton.c"