string/test-memcmp.c

   1 /* Test and measure memcmp functions.
   2    Copyright (C) 1999, 2002, 2003, 2005 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 __attribute ((unused));
  58       hp_timing_t stop __attribute ((unused));
  59       hp_timing_t best_time = ~ (hp_timing_t) 0;
  60       size_t i;
  61
  62       for (i = 0; i < 32; ++i)
  63         {
  64           HP_TIMING_NOW (start);
  65           CALL (impl, s1, s2, len);
  66           HP_TIMING_NOW (stop);
  67           HP_TIMING_BEST (best_time, start, stop);
  68         }
  69
  70       printf ("\t%zd", (size_t) best_time);
  71     }
  72 }
  73
  74 static void
  75 do_test (size_t align1, size_t align2, size_t len, int exp_result)
  76 {
  77   size_t i;
  78   char *s1, *s2;
  79
  80   if (len == 0)
  81     return;
  82
  83   align1 &= 7;
  84   if (align1 + len >= page_size)
  85     return;
  86
  87   align2 &= 7;
  88   if (align2 + len >= page_size)
  89     return;
  90
  91   s1 = (char *) (buf1 + align1);
  92   s2 = (char *) (buf2 + align2);
  93
  94   for (i = 0; i < len; i++)
  95     s1[i] = s2[i] = 1 + 23 * i % 255;
  96
  97   s1[len] = align1;
  98   s2[len] = align2;
  99   s2[len - 1] -= exp_result;
 100
 101   if (HP_TIMING_AVAIL)
 102     printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);
 103
 104   FOR_EACH_IMPL (impl, 0)
 105     do_one_test (impl, s1, s2, len, exp_result);
 106
 107   if (HP_TIMING_AVAIL)
 108     putchar ('\n');
 109 }
 110
 111 static void
 112 do_random_tests (void)
 113 {
 114   size_t i, j, n, align1, align2, pos, len;
 115   int result;
 116   long r;
 117   unsigned char *p1 = buf1 + page_size - 512;
 118   unsigned char *p2 = buf2 + page_size - 512;
 119
 120   for (n = 0; n < ITERATIONS; n++)
 121     {
 122       align1 = random () & 31;
 123       if (random () & 1)
 124         align2 = random () & 31;
 125       else
 126         align2 = align1 + (random () & 24);
 127       pos = random () & 511;
 128       j = align1;
 129       if (align2 > j)
 130         j = align2;
 131       if (pos + j >= 512)
 132         pos = 511 - j - (random () & 7);
 133       len = random () & 511;
 134       if (len + j >= 512)
 135         len = 511 - j - (random () & 7);
 136       j = len + align1 + 64;
 137       if (j > 512) j = 512;
 138       for (i = 0; i < j; ++i)
 139         p1[i] = random () & 255;
 140       for (i = 0; i < j; ++i)
 141         p2[i] = random () & 255;
 142
 143       result = 0;
 144       if (pos >= len)
 145         memcpy (p2 + align2, p1 + align1, len);
 146       else
 147         {
 148           memcpy (p2 + align2, p1 + align1, pos);
 149           if (p2[align2 + pos] == p1[align1 + pos])
 150             {
 151               p2[align2 + pos] = random () & 255;
 152               if (p2[align2 + pos] == p1[align1 + pos])
 153                 p2[align2 + pos] = p1[align1 + pos] + 3 + (random () & 127);
 154             }
 155
 156           if (p1[align1 + pos] < p2[align2 + pos])
 157             result = -1;
 158           else
 159             result = 1;
 160         }
 161
 162       FOR_EACH_IMPL (impl, 1)
 163         {
 164           r = CALL (impl, (char *) (p1 + align1), (char *) (p2 + align2), len);
 165           /* Test whether on 64-bit architectures where ABI requires
 166              callee to promote has the promotion been done.  */
 167           asm ("" : "=g" (r) : "0" (r));
 168           if ((r == 0 && result)
 169               || (r < 0 && result >= 0)
 170               || (r > 0 && result <= 0))
 171             {
 172               error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd, %zd) %ld != %d, p1 %p p2 %p",
 173                      n, impl->name, align1, align2, len, pos, r, result, p1, p2);
 174               ret = 1;
 175             }
 176         }
 177     }
 178 }
 179
 180 int
 181 test_main (void)
 182 {
 183   size_t i;
 184
 185   test_init ();
 186
 187   printf ("%23s", "");
 188   FOR_EACH_IMPL (impl, 0)
 189     printf ("\t%s", impl->name);
 190   putchar ('\n');
 191
 192   for (i = 1; i < 16; ++i)
 193     {
 194       do_test (i, i, i, 0);
 195       do_test (i, i, i, 1);
 196       do_test (i, i, i, -1);
 197     }
 198
 199   for (i = 0; i < 16; ++i)
 200     {
 201       do_test (0, 0, i, 0);
 202       do_test (0, 0, i, 1);
 203       do_test (0, 0, i, -1);
 204     }
 205
 206   for (i = 1; i < 10; ++i)
 207     {
 208       do_test (0, 0, 2 << i, 0);
 209       do_test (0, 0, 2 << i, 1);
 210       do_test (0, 0, 2 << i, -1);
 211       do_test (0, 0, 16 << i, 0);
 212       do_test (8 - i, 2 * i, 16 << i, 0);
 213       do_test (0, 0, 16 << i, 1);
 214       do_test (0, 0, 16 << i, -1);
 215     }
 216
 217   for (i = 1; i < 8; ++i)
 218     {
 219       do_test (i, 2 * i, 8 << i, 0);
 220       do_test (i, 2 * i, 8 << i, 1);
 221       do_test (i, 2 * i, 8 << i, -1);
 222     }
 223
 224   do_random_tests ();
 225   return ret;
 226 }
 227
 228 #include "../test-skeleton.c"