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