string/test-memcpy.c

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