string/test-memcpy.c

   1 /* Test and measure memcpy functions.
   2    Copyright (C) 1999-2013 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 #ifndef MEMCPY_RESULT
  21 # define MEMCPY_RESULT(dst, len) dst
  22 # define MIN_PAGE_SIZE 131072
  23 # define TEST_MAIN
  24 # define TEST_NAME "memcpy"
  25 # include "test-string.h"
  26
  27 char *simple_memcpy (char *, const char *, size_t);
  28 char *builtin_memcpy (char *, const char *, size_t);
  29
  30 IMPL (simple_memcpy, 0)
  31 IMPL (builtin_memcpy, 0)
  32 IMPL (memcpy, 1)
  33
  34 char *
  35 simple_memcpy (char *dst, const char *src, size_t n)
  36 {
  37   char *ret = dst;
  38   while (n--)
  39     *dst++ = *src++;
  40   return ret;
  41 }
  42
  43 char *
  44 builtin_memcpy (char *dst, const char *src, size_t n)
  45 {
  46   return __builtin_memcpy (dst, src, n);
  47 }
  48 #endif
  49
  50 typedef char *(*proto_t) (char *, const char *, size_t);
  51
  52 static void
  53 do_one_test (impl_t *impl, char *dst, const char *src,
  54              size_t len)
  55 {
  56   if (CALL (impl, dst, src, len) != MEMCPY_RESULT (dst, len))
  57     {
  58       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  59              CALL (impl, dst, src, len), MEMCPY_RESULT (dst, len));
  60       ret = 1;
  61       return;
  62     }
  63
  64   if (memcmp (dst, src, len) != 0)
  65     {
  66       error (0, 0, "Wrong result in function %s dst \"%s\" src \"%s\"",
  67              impl->name, dst, src);
  68       ret = 1;
  69       return;
  70     }
  71
  72   if (HP_TIMING_AVAIL)
  73     {
  74       hp_timing_t start __attribute ((unused));
  75       hp_timing_t stop __attribute ((unused));
  76       hp_timing_t best_time = ~ (hp_timing_t) 0;
  77       size_t i;
  78
  79       for (i = 0; i < 32; ++i)
  80         {
  81           HP_TIMING_NOW (start);
  82           CALL (impl, dst, src, len);
  83           HP_TIMING_NOW (stop);
  84           HP_TIMING_BEST (best_time, start, stop);
  85         }
  86
  87       printf ("\t%zd", (size_t) best_time);
  88     }
  89 }
  90
  91 static void
  92 do_test (size_t align1, size_t align2, size_t len)
  93 {
  94   size_t i, j;
  95   char *s1, *s2;
  96
  97   align1 &= 63;
  98   if (align1 + len >= page_size)
  99     return;
 100
 101   align2 &= 63;
 102   if (align2 + len >= page_size)
 103     return;
 104
 105   s1 = (char *) (buf1 + align1);
 106   s2 = (char *) (buf2 + align2);
 107
 108   for (i = 0, j = 1; i < len; i++, j += 23)
 109     s1[i] = j;
 110
 111   if (HP_TIMING_AVAIL)
 112     printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);
 113
 114   FOR_EACH_IMPL (impl, 0)
 115     do_one_test (impl, s2, s1, len);
 116
 117   if (HP_TIMING_AVAIL)
 118     putchar ('\n');
 119 }
 120
 121 static void
 122 do_random_tests (void)
 123 {
 124   size_t i, j, n, align1, align2, len, size1, size2, size;
 125   int c;
 126   unsigned char *p1, *p2;
 127   unsigned char *res;
 128
 129   for (n = 0; n < ITERATIONS; n++)
 130     {
 131       if (n == 0)
 132         {
 133           len = getpagesize ();
 134           size = len + 512;
 135           size1 = size;
 136           size2 = size;
 137           align1 = 512;
 138           align2 = 512;
 139         }
 140       else
 141         {
 142           if ((random () & 255) == 0)
 143             size = 65536;
 144           else
 145             size = 768;
 146           if (size > page_size)
 147             size = page_size;
 148           size1 = size;
 149           size2 = size;
 150           i = random ();
 151           if (i & 3)
 152             size -= 256;
 153           if (i & 1)
 154             size1 -= 256;
 155           if (i & 2)
 156             size2 -= 256;
 157           if (i & 4)
 158             {
 159               len = random () % size;
 160               align1 = size1 - len - (random () & 31);
 161               align2 = size2 - len - (random () & 31);
 162               if (align1 > size1)
 163                 align1 = 0;
 164               if (align2 > size2)
 165                 align2 = 0;
 166             }
 167           else
 168             {
 169               align1 = random () & 63;
 170               align2 = random () & 63;
 171               len = random () % size;
 172               if (align1 + len > size1)
 173                 align1 = size1 - len;
 174               if (align2 + len > size2)
 175                 align2 = size2 - len;
 176             }
 177         }
 178       p1 = buf1 + page_size - size1;
 179       p2 = buf2 + page_size - size2;
 180       c = random () & 255;
 181       j = align1 + len + 256;
 182       if (j > size1)
 183         j = size1;
 184       for (i = 0; i < j; ++i)
 185         p1[i] = random () & 255;
 186
 187       FOR_EACH_IMPL (impl, 1)
 188         {
 189           j = align2 + len + 256;
 190           if (j > size2)
 191             j = size2;
 192           memset (p2, c, j);
 193           res = (unsigned char *) CALL (impl,
 194                                         (char *) (p2 + align2),
 195                                         (char *) (p1 + align1), len);
 196           if (res != MEMCPY_RESULT (p2 + align2, len))
 197             {
 198               error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd) %p != %p",
 199                      n, impl->name, align1, align2, len, res,
 200                      MEMCPY_RESULT (p2 + align2, len));
 201               ret = 1;
 202             }
 203           for (i = 0; i < align2; ++i)
 204             {
 205               if (p2[i] != c)
 206                 {
 207                   error (0, 0, "Iteration %zd - garbage before, %s (%zd, %zd, %zd)",
 208                          n, impl->name, align1, align2, len);
 209                   ret = 1;
 210                   break;
 211                 }
 212             }
 213           for (i = align2 + len; i < j; ++i)
 214             {
 215               if (p2[i] != c)
 216                 {
 217                   error (0, 0, "Iteration %zd - garbage after, %s (%zd, %zd, %zd)",
 218                          n, impl->name, align1, align2, len);
 219                   ret = 1;
 220                   break;
 221                 }
 222             }
 223           if (memcmp (p1 + align1, p2 + align2, len))
 224             {
 225               error (0, 0, "Iteration %zd - different strings, %s (%zd, %zd, %zd)",
 226                      n, impl->name, align1, align2, len);
 227               ret = 1;
 228             }
 229         }
 230     }
 231 }
 232
 233 int
 234 test_main (void)
 235 {
 236   size_t i;
 237
 238   test_init ();
 239
 240   printf ("%23s", "");
 241   FOR_EACH_IMPL (impl, 0)
 242     printf ("\t%s", impl->name);
 243   putchar ('\n');
 244
 245   for (i = 0; i < 18; ++i)
 246     {
 247       do_test (0, 0, 1 << i);
 248       do_test (i, 0, 1 << i);
 249       do_test (0, i, 1 << i);
 250       do_test (i, i, 1 << i);
 251     }
 252
 253   for (i = 0; i < 32; ++i)
 254     {
 255       do_test (0, 0, i);
 256       do_test (i, 0, i);
 257       do_test (0, i, i);
 258       do_test (i, i, i);
 259     }
 260
 261   for (i = 3; i < 32; ++i)
 262     {
 263       if ((i & (i - 1)) == 0)
 264         continue;
 265       do_test (0, 0, 16 * i);
 266       do_test (i, 0, 16 * i);
 267       do_test (0, i, 16 * i);
 268       do_test (i, i, 16 * i);
 269     }
 270
 271   do_test (0, 0, getpagesize ());
 272
 273   do_random_tests ();
 274   return ret;
 275 }
 276
 277 #include "../test-skeleton.c"