string/test-memmove.c

   1 /* Test and measure memmove functions.
   2    Copyright (C) 1999-2012 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 #ifdef TEST_BCOPY
  22 # define TEST_NAME "bcopy"
  23 #else
  24 # define TEST_NAME "memmove"
  25 #endif
  26 #include "test-string.h"
  27
  28 char *simple_memmove (char *, const char *, size_t);
  29
  30 #ifdef TEST_BCOPY
  31 typedef void (*proto_t) (const char *, char *, size_t);
  32 void simple_bcopy (const char *, char *, size_t);
  33
  34 IMPL (simple_bcopy, 0)
  35 IMPL (bcopy, 1)
  36
  37 void
  38 simple_bcopy (const char *src, char *dst, size_t n)
  39 {
  40   simple_memmove (dst, src, n);
  41 }
  42 #else
  43 typedef char *(*proto_t) (char *, const char *, size_t);
  44
  45 IMPL (simple_memmove, 0)
  46 IMPL (memmove, 1)
  47 #endif
  48
  49 char *
  50 simple_memmove (char *dst, const char *src, size_t n)
  51 {
  52   char *ret = dst;
  53   if (src < dst)
  54     {
  55       dst += n;
  56       src += n;
  57       while (n--)
  58         *--dst = *--src;
  59     }
  60   else
  61     while (n--)
  62       *dst++ = *src++;
  63   return ret;
  64 }
  65
  66 static void
  67 do_one_test (impl_t *impl, char *dst, char *src, const char *orig_src,
  68              size_t len)
  69 {
  70   memcpy (src, orig_src, len);
  71 #ifdef TEST_BCOPY
  72   CALL (impl, src, dst, len);
  73 #else
  74   char *res;
  75
  76   res = CALL (impl, dst, src, len);
  77   if (res != dst)
  78     {
  79       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  80              res, dst);
  81       ret = 1;
  82       return;
  83     }
  84 #endif
  85
  86   if (memcmp (dst, orig_src, len) != 0)
  87     {
  88       error (0, 0, "Wrong result in function %s dst \"%s\" src \"%s\"",
  89              impl->name, dst, src);
  90       ret = 1;
  91       return;
  92     }
  93
  94   if (HP_TIMING_AVAIL)
  95     {
  96       hp_timing_t start __attribute ((unused));
  97       hp_timing_t stop __attribute ((unused));
  98       hp_timing_t best_time = ~ (hp_timing_t) 0;
  99       size_t i;
 100
 101       for (i = 0; i < 32; ++i)
 102         {
 103           HP_TIMING_NOW (start);
 104 #ifdef TEST_BCOPY
 105           CALL (impl, src, dst, len);
 106 #else
 107           CALL (impl, dst, src, len);
 108 #endif
 109           HP_TIMING_NOW (stop);
 110           HP_TIMING_BEST (best_time, start, stop);
 111         }
 112
 113       printf ("\t%zd", (size_t) best_time);
 114     }
 115 }
 116
 117 static void
 118 do_test (size_t align1, size_t align2, size_t len)
 119 {
 120   size_t i, j;
 121   char *s1, *s2;
 122
 123   align1 &= 63;
 124   if (align1 + len >= page_size)
 125     return;
 126
 127   align2 &= 63;
 128   if (align2 + len >= page_size)
 129     return;
 130
 131   s1 = (char *) (buf1 + align1);
 132   s2 = (char *) (buf2 + align2);
 133
 134   for (i = 0, j = 1; i < len; i++, j += 23)
 135     s1[i] = j;
 136
 137   if (HP_TIMING_AVAIL)
 138     printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);
 139
 140   FOR_EACH_IMPL (impl, 0)
 141     do_one_test (impl, s2, (char *) (buf2 + align1), s1, len);
 142
 143   if (HP_TIMING_AVAIL)
 144     putchar ('\n');
 145 }
 146
 147 static void
 148 do_random_tests (void)
 149 {
 150   size_t i, n, align1, align2, len, size;
 151   size_t srcstart, srcend, dststart, dstend;
 152   int c;
 153   unsigned char *p1, *p2;
 154 #ifndef TEST_BCOPY
 155   unsigned char *res;
 156 #endif
 157
 158   for (n = 0; n < ITERATIONS; n++)
 159     {
 160       if ((random () & 255) == 0)
 161         size = 65536;
 162       else
 163         size = 512;
 164       if (size > page_size)
 165         size = page_size;
 166       if ((random () & 3) == 0)
 167         {
 168           len = random () & (size - 1);
 169           align1 = size - len - (random () & 31);
 170           align2 = size - len - (random () & 31);
 171           if (align1 > size)
 172             align1 = 0;
 173           if (align2 > size)
 174             align2 = 0;
 175         }
 176       else
 177         {
 178           align1 = random () & (size / 2 - 1);
 179           align2 = random () & (size / 2 - 1);
 180           len = random () & (size - 1);
 181           if (align1 + len > size)
 182             align1 = size - len;
 183           if (align2 + len > size)
 184             align2 = size - len;
 185         }
 186
 187       p1 = buf1 + page_size - size;
 188       p2 = buf2 + page_size - size;
 189       c = random () & 255;
 190       srcend = align1 + len + 256;
 191       if (srcend > size)
 192         srcend = size;
 193       if (align1 > 256)
 194         srcstart = align1 - 256;
 195       else
 196         srcstart = 0;
 197       for (i = srcstart; i < srcend; ++i)
 198         p1[i] = random () & 255;
 199       dstend = align2 + len + 256;
 200       if (dstend > size)
 201         dstend = size;
 202       if (align2 > 256)
 203         dststart = align2 - 256;
 204       else
 205         dststart = 0;
 206
 207       FOR_EACH_IMPL (impl, 1)
 208         {
 209           memset (p2 + dststart, c, dstend - dststart);
 210           memcpy (p2 + srcstart, p1 + srcstart, srcend - srcstart);
 211 #ifdef TEST_BCOPY
 212           CALL (impl, (char *) (p2 + align1), (char *) (p2 + align2), len);
 213 #else
 214           res = (unsigned char *) CALL (impl,
 215                                         (char *) (p2 + align2),
 216                                         (char *) (p2 + align1), len);
 217           if (res != p2 + align2)
 218             {
 219               error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd) %p != %p",
 220                      n, impl->name, align1, align2, len, res, p2 + align2);
 221               ret = 1;
 222             }
 223 #endif
 224           if (memcmp (p1 + align1, p2 + align2, len))
 225             {
 226               error (0, 0, "Iteration %zd - different strings, %s (%zd, %zd, %zd)",
 227                      n, impl->name, align1, align2, len);
 228               ret = 1;
 229             }
 230           for (i = dststart; i < dstend; ++i)
 231             {
 232               if (i >= align2 && i < align2 + len)
 233                 {
 234                   i = align2 + len - 1;
 235                   continue;
 236                 }
 237               if (i >= srcstart && i < srcend)
 238                 {
 239                   i = srcend - 1;
 240                   continue;
 241                 }
 242               if (p2[i] != c)
 243                 {
 244                   error (0, 0, "Iteration %zd - garbage in memset area, %s (%zd, %zd, %zd)",
 245                          n, impl->name, align1, align2, len);
 246                   ret = 1;
 247                   break;
 248                 }
 249             }
 250
 251           if (srcstart < align2
 252               && memcmp (p2 + srcstart, p1 + srcstart,
 253                          (srcend > align2 ? align2 : srcend) - srcstart))
 254             {
 255               error (0, 0, "Iteration %zd - garbage before dst, %s (%zd, %zd, %zd)",
 256                      n, impl->name, align1, align2, len);
 257               ret = 1;
 258               break;
 259             }
 260
 261           i = srcstart > align2 + len ? srcstart : align2 + len;
 262           if (srcend > align2 + len
 263               && memcmp (p2 + i, p1 + i, srcend - i))
 264             {
 265               error (0, 0, "Iteration %zd - garbage after dst, %s (%zd, %zd, %zd)",
 266                      n, impl->name, align1, align2, len);
 267               ret = 1;
 268               break;
 269             }
 270         }
 271     }
 272 }
 273
 274 int
 275 test_main (void)
 276 {
 277   size_t i;
 278
 279   test_init ();
 280
 281   printf ("%23s", "");
 282   FOR_EACH_IMPL (impl, 0)
 283     printf ("\t%s", impl->name);
 284   putchar ('\n');
 285
 286   for (i = 0; i < 14; ++i)
 287     {
 288       do_test (0, 32, 1 << i);
 289       do_test (32, 0, 1 << i);
 290       do_test (0, i, 1 << i);
 291       do_test (i, 0, 1 << i);
 292     }
 293
 294   for (i = 0; i < 32; ++i)
 295     {
 296       do_test (0, 32, i);
 297       do_test (32, 0, i);
 298       do_test (0, i, i);
 299       do_test (i, 0, i);
 300     }
 301
 302   for (i = 3; i < 32; ++i)
 303     {
 304       if ((i & (i - 1)) == 0)
 305         continue;
 306       do_test (0, 32, 16 * i);
 307       do_test (32, 0, 16 * i);
 308       do_test (0, i, 16 * i);
 309       do_test (i, 0, 16 * i);
 310     }
 311
 312   do_random_tests ();
 313   return ret;
 314 }
 315
 316 #include "../test-skeleton.c"