string/test-memset.c

   1 /* Test and measure memset 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_BZERO
  22 # define TEST_NAME "bzero"
  23 #else
  24 # define TEST_NAME "memset"
  25 #endif
  26 #define MIN_PAGE_SIZE 131072
  27 #include "test-string.h"
  28
  29 char *simple_memset (char *, int, size_t);
  30
  31 #ifdef TEST_BZERO
  32 typedef void (*proto_t) (char *, size_t);
  33 void simple_bzero (char *, size_t);
  34 void builtin_bzero (char *, size_t);
  35
  36 IMPL (simple_bzero, 0)
  37 IMPL (builtin_bzero, 0)
  38 IMPL (bzero, 1)
  39
  40 void
  41 simple_bzero (char *s, size_t n)
  42 {
  43   simple_memset (s, 0, n);
  44 }
  45
  46 void
  47 builtin_bzero (char *s, size_t n)
  48 {
  49   __builtin_bzero (s, n);
  50 }
  51 #else
  52 typedef char *(*proto_t) (char *, int, size_t);
  53 char *builtin_memset (char *, int, size_t);
  54
  55 IMPL (simple_memset, 0)
  56 IMPL (builtin_memset, 0)
  57 IMPL (memset, 1)
  58
  59 char *
  60 builtin_memset (char *s, int c, size_t n)
  61 {
  62   return __builtin_memset (s, c, n);
  63 }
  64 #endif
  65
  66 char *
  67 simple_memset (char *s, int c, size_t n)
  68 {
  69   char *r = s, *end = s + n;
  70   while (r < end)
  71     *r++ = c;
  72   return s;
  73 }
  74
  75 static void
  76 do_one_test (impl_t *impl, char *s, int c __attribute ((unused)), size_t n)
  77 {
  78   char tstbuf[n];
  79 #ifdef TEST_BZERO
  80   simple_bzero (tstbuf, n);
  81   CALL (impl, s, n);
  82   if (memcmp (s, tstbuf, n) != 0)
  83 #else
  84   char *res = CALL (impl, s, c, n);
  85   if (res != s
  86       || simple_memset (tstbuf, c, n) != tstbuf
  87       || memcmp (s, tstbuf, n) != 0)
  88 #endif
  89     {
  90       error (0, 0, "Wrong result in function %s", impl->name);
  91       ret = 1;
  92       return;
  93     }
  94
  95   if (HP_TIMING_AVAIL)
  96     {
  97       hp_timing_t start __attribute ((unused));
  98       hp_timing_t stop __attribute ((unused));
  99       hp_timing_t best_time = ~ (hp_timing_t) 0;
 100       size_t i;
 101
 102       for (i = 0; i < 32; ++i)
 103         {
 104           HP_TIMING_NOW (start);
 105 #ifdef TEST_BZERO
 106           CALL (impl, s, n);
 107 #else
 108           CALL (impl, s, c, n);
 109 #endif
 110
 111           HP_TIMING_NOW (stop);
 112           HP_TIMING_BEST (best_time, start, stop);
 113         }
 114
 115       printf ("\t%zd", (size_t) best_time);
 116     }
 117 }
 118
 119 static void
 120 do_test (size_t align, int c, size_t len)
 121 {
 122   align &= 7;
 123   if (align + len > page_size)
 124     return;
 125
 126   if (HP_TIMING_AVAIL)
 127     printf ("Length %4zd, alignment %2zd, c %2d:", len, align, c);
 128
 129   FOR_EACH_IMPL (impl, 0)
 130     do_one_test (impl, (char *) buf1 + align, c, len);
 131
 132   if (HP_TIMING_AVAIL)
 133     putchar ('\n');
 134 }
 135
 136 #ifndef TEST_BZERO
 137 static void
 138 do_random_tests (void)
 139 {
 140   size_t i, j, k, n, align, len, size;
 141   int c, o;
 142   unsigned char *p, *res;
 143
 144   for (i = 0; i < 65536; ++i)
 145     buf2[i] = random () & 255;
 146
 147   for (n = 0; n < ITERATIONS; n++)
 148     {
 149       if ((random () & 31) == 0)
 150         size = 65536;
 151       else
 152         size = 512;
 153       p = buf1 + page_size - size;
 154       len = random () & (size - 1);
 155       align = size - len - (random () & 31);
 156       if (align > size)
 157         align = size - len;
 158       if ((random () & 7) == 0)
 159         align &= ~63;
 160       if ((random () & 7) == 0)
 161         c = 0;
 162       else
 163         c = random () & 255;
 164       o = random () & 255;
 165       if (o == c)
 166         o = (c + 1) & 255;
 167       j = len + align + 128;
 168       if (j > size)
 169         j = size;
 170       if (align >= 128)
 171         k = align - 128;
 172       else
 173         k = 0;
 174       for (i = k; i < align; ++i)
 175         p[i] = o;
 176       for (i = align + len; i < j; ++i)
 177         p[i] = o;
 178
 179       FOR_EACH_IMPL (impl, 1)
 180         {
 181           for (i = 0; i < len; ++i)
 182             {
 183               p[i + align] = buf2[i];
 184               if (p[i + align] == c)
 185                 p[i + align] = o;
 186             }
 187           res = (unsigned char *) CALL (impl, (char *) p + align, c, len);
 188           if (res != p + align)
 189             {
 190               error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %d, %zd) %p != %p",
 191                      n, impl->name, align, c, len, res, p + align);
 192               ret = 1;
 193             }
 194           for (i = k; i < align; ++i)
 195             if (p[i] != o)
 196               {
 197                 error (0, 0, "Iteration %zd - garbage before %s (%zd, %d, %zd)",
 198                        n, impl->name, align, c, len);
 199                 ret = 1;
 200                 break;
 201               }
 202           for (; i < align + len; ++i)
 203             if (p[i] != c)
 204               {
 205                 error (0, 0, "Iteration %zd - not cleared correctly %s (%zd, %d, %zd)",
 206                        n, impl->name, align, c, len);
 207                 ret = 1;
 208                 break;
 209               }
 210           for (; i < j; ++i)
 211             if (p[i] != o)
 212               {
 213                 error (0, 0, "Iteration %zd - garbage after %s (%zd, %d, %zd)",
 214                        n, impl->name, align, c, len);
 215                 ret = 1;
 216                 break;
 217               }
 218         }
 219     }
 220 }
 221 #endif
 222
 223 int
 224 test_main (void)
 225 {
 226   size_t i;
 227   int c = 0;
 228
 229   test_init ();
 230
 231   printf ("%24s", "");
 232   FOR_EACH_IMPL (impl, 0)
 233     printf ("\t%s", impl->name);
 234   putchar ('\n');
 235
 236 #ifndef TEST_BZERO
 237   for (c = -65; c <= 130; c += 65)
 238 #endif
 239     {
 240       for (i = 0; i < 18; ++i)
 241         do_test (0, c, 1 << i);
 242       for (i = 1; i < 32; ++i)
 243         {
 244           do_test (i, c, i);
 245           if (i & (i - 1))
 246             do_test (0, c, i);
 247         }
 248       do_test (1, c, 14);
 249       do_test (3, c, 1024);
 250       do_test (4, c, 64);
 251       do_test (2, c, 25);
 252     }
 253
 254 #ifndef TEST_BZERO
 255   do_random_tests ();
 256 #endif
 257
 258   return ret;
 259 }
 260
 261 #include "../test-skeleton.c"