string/test-memcpy.c

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