string/test-memcpy.c

   1 /* Test and measure memcpy functions.
   2    Copyright (C) 1999-2024 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 /* test-memcpy-support.h contains all test functions.  */
  20 #include "test-memcpy-support.h"
  21
  22 static void
  23 do_random_tests (void)
  24 {
  25   size_t i, j, n, align1, align2, len, size1, size2, size;
  26   int c;
  27   unsigned char *p1, *p2;
  28   unsigned char *res;
  29
  30   for (n = 0; n < ITERATIONS; n++)
  31     {
  32       if (n == 0)
  33         {
  34           len = getpagesize ();
  35           size = len + 512;
  36           size1 = size;
  37           size2 = size;
  38           align1 = 512;
  39           align2 = 512;
  40         }
  41       else
  42         {
  43           if ((random () & 255) == 0)
  44             size = 65536;
  45           else
  46             size = 768;
  47           if (size > page_size)
  48             size = page_size;
  49           size1 = size;
  50           size2 = size;
  51           i = random ();
  52           if (i & 3)
  53             size -= 256;
  54           if (i & 1)
  55             size1 -= 256;
  56           if (i & 2)
  57             size2 -= 256;
  58           if (i & 4)
  59             {
  60               len = random () % size;
  61               align1 = size1 - len - (random () & 31);
  62               align2 = size2 - len - (random () & 31);
  63               if (align1 > size1)
  64                 align1 = 0;
  65               if (align2 > size2)
  66                 align2 = 0;
  67             }
  68           else
  69             {
  70               align1 = random () & 63;
  71               align2 = random () & 63;
  72               len = random () % size;
  73               if (align1 + len > size1)
  74                 align1 = size1 - len;
  75               if (align2 + len > size2)
  76                 align2 = size2 - len;
  77             }
  78         }
  79       p1 = buf1 + page_size - size1;
  80       p2 = buf2 + page_size - size2;
  81       c = random () & 255;
  82       j = align1 + len + 256;
  83       if (j > size1)
  84         j = size1;
  85       for (i = 0; i < j; ++i)
  86         p1[i] = random () & 255;
  87
  88       FOR_EACH_IMPL (impl, 1)
  89       {
  90         j = align2 + len + 256;
  91         if (j > size2)
  92           j = size2;
  93         memset (p2, c, j);
  94         res = (unsigned char *)CALL (impl, (char *)(p2 + align2),
  95                                      (char *)(p1 + align1), len);
  96         if (res != MEMCPY_RESULT (p2 + align2, len))
  97           {
  98             error (0, 0,
  99                    "Iteration %zd - wrong result in function %s (%zd, %zd, "
 100                    "%zd) %p != %p",
 101                    n, impl->name, align1, align2, len, res,
 102                    MEMCPY_RESULT (p2 + align2, len));
 103             ret = 1;
 104           }
 105         for (i = 0; i < align2; ++i)
 106           {
 107             if (p2[i] != c)
 108               {
 109                 error (0, 0,
 110                        "Iteration %zd - garbage before, %s (%zd, %zd, %zd)", n,
 111                        impl->name, align1, align2, len);
 112                 ret = 1;
 113                 break;
 114               }
 115           }
 116         for (i = align2 + len; i < j; ++i)
 117           {
 118             if (p2[i] != c)
 119               {
 120                 error (0, 0,
 121                        "Iteration %zd - garbage after, %s (%zd, %zd, %zd)", n,
 122                        impl->name, align1, align2, len);
 123                 ret = 1;
 124                 break;
 125               }
 126           }
 127         if (memcmp (p1 + align1, p2 + align2, len))
 128           {
 129             error (0, 0,
 130                    "Iteration %zd - different strings, %s (%zd, %zd, %zd)", n,
 131                    impl->name, align1, align2, len);
 132             ret = 1;
 133           }
 134       }
 135     }
 136 }
 137
 138 int
 139 test_main (void)
 140 {
 141   size_t i, j;
 142
 143   test_init ();
 144
 145   printf ("%23s", "");
 146   FOR_EACH_IMPL (impl, 0)
 147   printf ("\t%s", impl->name);
 148   putchar ('\n');
 149
 150   for (i = 0; i < 18; ++i)
 151     {
 152       do_test (0, 0, 1 << i);
 153       do_test (i, 0, 1 << i);
 154       do_test (0, i, 1 << i);
 155       do_test (i, i, 1 << i);
 156     }
 157   for (i = 0; i < 32; ++i)
 158     {
 159       do_test (0, 0, i);
 160       do_test (i, 0, i);
 161       do_test (0, i, i);
 162       do_test (i, i, i);
 163     }
 164
 165   for (i = 3; i < 32; ++i)
 166     {
 167       if ((i & (i - 1)) == 0)
 168         continue;
 169       do_test (0, 0, 16 * i);
 170       do_test (i, 0, 16 * i);
 171       do_test (0, i, 16 * i);
 172       do_test (i, i, 16 * i);
 173     }
 174
 175   for (i = 19; i <= 25; ++i)
 176     {
 177       do_test (255, 0, 1 << i);
 178       do_test (0, 4000, 1 << i);
 179       do_test (0, 255, i);
 180       do_test (0, 4000, i);
 181     }
 182
 183   do_test (0, 0, getpagesize ());
 184   do_random_tests ();
 185
 186   do_test1 (0, 0, 0x100000);
 187   do_test1 (0, 0, 0x2000000);
 188
 189   for (i = 4096; i < 32768; i += 4096)
 190     {
 191       for (j = 1; j <= 1024; j <<= 1)
 192         {
 193           do_test1 (0, j, i);
 194           do_test1 (4095, j, i);
 195           do_test1 (4096 - j, 0, i);
 196
 197           do_test1 (0, j - 1, i);
 198           do_test1 (4095, j - 1, i);
 199           do_test1 (4096 - j - 1, 0, i);
 200
 201           do_test1 (0, j + 1, i);
 202           do_test1 (4095, j + 1, i);
 203           do_test1 (4096 - j, 1, i);
 204         }
 205     }
 206
 207   for (i = 0x300000; i < 0x2000000; i += 0x235689)
 208     {
 209       for (j = 64; j <= 1024; j <<= 1)
 210         {
 211           do_test1 (0, j, i);
 212           do_test1 (4095, j, i);
 213           do_test1 (4096 - j, 0, i);
 214
 215           do_test1 (0, j - 1, i);
 216           do_test1 (4095, j - 1, i);
 217           do_test1 (4096 - j - 1, 0, i);
 218
 219           do_test1 (0, j + 1, i);
 220           do_test1 (4095, j + 1, i);
 221           do_test1 (4096 - j, 1, i);
 222         }
 223     }
 224
 225   return ret;
 226 }
 227
 228 #include <support/test-driver.c>