string/test-memcmp.c

   1 /* Test and measure memcmp functions.
   2    Copyright (C) 1999, 2002 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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #define TEST_MAIN
  22 #include "test-string.h"
  23
  24 typedef int (*proto_t) (const char *, const char *, size_t);
  25 int simple_memcmp (const char *, const char *, size_t);
  26
  27 IMPL (simple_memcmp, 0)
  28 IMPL (memcmp, 1)
  29
  30 int
  31 simple_memcmp (const char *s1, const char *s2, size_t n)
  32 {
  33   int ret = 0;
  34
  35   while (n--
  36          && (ret = *(unsigned char *) s1++ - *(unsigned char *) s2++) == 0);
  37   return ret;
  38 }
  39
  40 static void
  41 do_one_test (impl_t *impl, const char *s1, const char *s2, size_t len,
  42              int exp_result)
  43 {
  44   int result = CALL (impl, s1, s2, len);
  45   if ((exp_result == 0 && result != 0)
  46       || (exp_result < 0 && result >= 0)
  47       || (exp_result > 0 && result <= 0))
  48     {
  49       error (0, 0, "Wrong result in function %s %d %d", impl->name,
  50              result, exp_result);
  51       ret = 1;
  52       return;
  53     }
  54
  55   if (HP_TIMING_AVAIL)
  56     {
  57       hp_timing_t start, stop, best_time = ~ (hp_timing_t) 0;
  58       size_t i;
  59
  60       for (i = 0; i < 32; ++i)
  61         {
  62           HP_TIMING_NOW (start);
  63           CALL (impl, s1, s2, len);
  64           HP_TIMING_NOW (stop);
  65           HP_TIMING_BEST (best_time, start, stop);
  66         }
  67
  68       printf ("\t%zd", (size_t) best_time);
  69     }
  70 }
  71
  72 static void
  73 do_test (size_t align1, size_t align2, size_t len, int exp_result)
  74 {
  75   size_t i;
  76   char *s1, *s2;
  77
  78   if (len == 0)
  79     return;
  80
  81   align1 &= 7;
  82   if (align1 + len >= page_size)
  83     return;
  84
  85   align2 &= 7;
  86   if (align2 + len >= page_size)
  87     return;
  88
  89   s1 = buf1 + align1;
  90   s2 = buf2 + align2;
  91
  92   for (i = 0; i < len; i++)
  93     s1[i] = s2[i] = 1 + 23 * i % 255;
  94
  95   s1[len] = align1;
  96   s2[len] = align2;
  97   s2[len - 1] -= exp_result;
  98
  99   if (HP_TIMING_AVAIL)
 100     printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);
 101
 102   FOR_EACH_IMPL (impl, 0)
 103     do_one_test (impl, s1, s2, len, exp_result);
 104
 105   if (HP_TIMING_AVAIL)
 106     putchar ('\n');
 107 }
 108
 109 static void
 110 do_random_tests (void)
 111 {
 112   size_t i, j, n, align1, align2, pos, len;
 113   int result, r;
 114   unsigned char *p1 = buf1 + page_size - 512;
 115   unsigned char *p2 = buf2 + page_size - 512;
 116
 117   for (n = 0; n < ITERATIONS; n++)
 118     {
 119       align1 = random () & 31;
 120       if (random () & 1)
 121         align2 = random () & 31;
 122       else
 123         align2 = align1 + (random () & 24);
 124       pos = random () & 511;
 125       j = align1;
 126       if (align2 > j)
 127         j = align2;
 128       if (pos + j >= 512)
 129         pos = 511 - j - (random () & 7);
 130       len = random () & 511;
 131       if (len + j >= 512)
 132         len = 511 - j - (random () & 7);
 133       j = len + align1 + 64;
 134       if (j > 512) j = 512;
 135       for (i = 0; i < j; ++i)
 136         p1[i] = random () & 255;
 137       for (i = 0; i < j; ++i)
 138         p2[i] = random () & 255;
 139
 140       result = 0;
 141       if (pos >= len)
 142         memcpy (p2 + align2, p1 + align1, len);
 143       else
 144         {
 145           memcpy (p2 + align2, p1 + align1, pos);
 146           if (p2[align2 + pos] == p1[align1 + pos])
 147             {
 148               p2[align2 + pos] = random () & 255;
 149               if (p2[align2 + pos] == p1[align1 + pos])
 150                 p2[align2 + pos] = p1[align1 + pos] + 3 + (random () & 127);
 151             }
 152
 153           if (p1[align1 + pos] < p2[align2 + pos])
 154             result = -1;
 155           else
 156             result = 1;
 157         }
 158
 159       FOR_EACH_IMPL (impl, 1)
 160         {
 161           r = CALL (impl, p1 + align1, p2 + align2, len);
 162           if ((r == 0 && result)
 163               || (r < 0 && result >= 0)
 164               || (r > 0 && result <= 0))
 165             {
 166               error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd, %zd) %d != %d, p1 %p p2 %p",
 167                      n, impl->name, align1, align2, len, pos, r, result, p1, p2);
 168               ret = 1;
 169             }
 170         }
 171     }
 172 }
 173
 174 int
 175 test_main (void)
 176 {
 177   size_t i;
 178
 179   test_init ();
 180
 181   printf ("%23s", "");
 182   FOR_EACH_IMPL (impl, 0)
 183     printf ("\t%s", impl->name);
 184   putchar ('\n');
 185
 186   for (i = 1; i < 16; ++i)
 187     {
 188       do_test (i, i, i, 0);
 189       do_test (i, i, i, 1);
 190       do_test (i, i, i, -1);
 191     }
 192
 193   for (i = 0; i < 16; ++i)
 194     {
 195       do_test (0, 0, i, 0);
 196       do_test (0, 0, i, 1);
 197       do_test (0, 0, i, -1);
 198     }
 199
 200   for (i = 1; i < 10; ++i)
 201     {
 202       do_test (0, 0, 2 << i, 0);
 203       do_test (0, 0, 2 << i, 1);
 204       do_test (0, 0, 2 << i, -1);
 205       do_test (0, 0, 16 << i, 0);
 206       do_test (8 - i, 2 * i, 16 << i, 0);
 207       do_test (0, 0, 16 << i, 1);
 208       do_test (0, 0, 16 << i, -1);
 209     }
 210
 211   for (i = 1; i < 8; ++i)
 212     {
 213       do_test (i, 2 * i, 8 << i, 0);
 214       do_test (i, 2 * i, 8 << i, 1);
 215       do_test (i, 2 * i, 8 << i, -1);
 216     }
 217
 218   do_random_tests ();
 219   return ret;
 220 }
 221
 222 #include "../test-skeleton.c"