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