string/test-strcmp.c

   1 /* Test and measure strcmp 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 *);
  25 int simple_strcmp (const char *, const char *);
  26 int stupid_strcmp (const char *, const char *);
  27
  28 IMPL (stupid_strcmp, 0)
  29 IMPL (simple_strcmp, 0)
  30 IMPL (strcmp, 1)
  31
  32 int
  33 simple_strcmp (const char *s1, const char *s2)
  34 {
  35   int ret;
  36
  37   while ((ret = *(unsigned char *) s1 - *(unsigned char *) s2++) == 0
  38          && *s1++);
  39   return ret;
  40 }
  41
  42 int
  43 stupid_strcmp (const char *s1, const char *s2)
  44 {
  45   size_t ns1 = strlen (s1) + 1, ns2 = strlen (s2) + 1;
  46   size_t n = ns1 < ns2 ? ns1 : ns2;
  47   int ret = 0;
  48
  49   while (n--)
  50     if ((ret = *(unsigned char *) s1++ - *(unsigned char *) s2++) != 0)
  51       break;
  52   return ret;
  53 }
  54
  55 static void
  56 do_one_test (impl_t *impl, const char *s1, const char *s2, int exp_result)
  57 {
  58   int result = CALL (impl, s1, s2);
  59   if ((exp_result == 0 && result != 0)
  60       || (exp_result < 0 && result >= 0)
  61       || (exp_result > 0 && result <= 0))
  62     {
  63       error (0, 0, "Wrong result in function %s %d %d", impl->name,
  64              result, exp_result);
  65       ret = 1;
  66       return;
  67     }
  68
  69   if (HP_TIMING_AVAIL)
  70     {
  71       hp_timing_t start __attribute ((unused));
  72       hp_timing_t stop __attribute ((unused));
  73       hp_timing_t best_time = ~ (hp_timing_t) 0;
  74       size_t i;
  75
  76       for (i = 0; i < 32; ++i)
  77         {
  78           HP_TIMING_NOW (start);
  79           CALL (impl, s1, s2);
  80           HP_TIMING_NOW (stop);
  81           HP_TIMING_BEST (best_time, start, stop);
  82         }
  83
  84       printf ("\t%zd", (size_t) best_time);
  85     }
  86 }
  87
  88 static void
  89 do_test (size_t align1, size_t align2, size_t len, int max_char,
  90          int exp_result)
  91 {
  92   size_t i;
  93   char *s1, *s2;
  94
  95   if (len == 0)
  96     return;
  97
  98   align1 &= 7;
  99   if (align1 + len + 1 >= page_size)
 100     return;
 101
 102   align2 &= 7;
 103   if (align2 + len + 1 >= page_size)
 104     return;
 105
 106   s1 = (char *) (buf1 + align1);
 107   s2 = (char *) (buf2 + align2);
 108
 109   for (i = 0; i < len; i++)
 110     s1[i] = s2[i] = 1 + 23 * i % max_char;
 111
 112   s1[len] = s2[len] = 0;
 113   s1[len + 1] = 23;
 114   s2[len + 1] = 24 + exp_result;
 115   s2[len - 1] -= exp_result;
 116
 117   if (HP_TIMING_AVAIL)
 118     printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);
 119
 120   FOR_EACH_IMPL (impl, 0)
 121     do_one_test (impl, s1, s2, exp_result);
 122
 123   if (HP_TIMING_AVAIL)
 124     putchar ('\n');
 125 }
 126
 127 static void
 128 do_random_tests (void)
 129 {
 130   size_t i, j, n, align1, align2, pos, len1, len2;
 131   int result;
 132   long r;
 133   unsigned char *p1 = buf1 + page_size - 512;
 134   unsigned char *p2 = buf2 + page_size - 512;
 135
 136   for (n = 0; n < ITERATIONS; n++)
 137     {
 138       align1 = random () & 31;
 139       if (random () & 1)
 140         align2 = random () & 31;
 141       else
 142         align2 = align1 + (random () & 24);
 143       pos = random () & 511;
 144       j = align1 > align2 ? align1 : align2;
 145       if (pos + j >= 511)
 146         pos = 510 - j - (random () & 7);
 147       len1 = random () & 511;
 148       if (pos >= len1 && (random () & 1))
 149         len1 = pos + (random () & 7);
 150       if (len1 + j >= 512)
 151         len1 = 511 - j - (random () & 7);
 152       if (pos >= len1)
 153         len2 = len1;
 154       else
 155         len2 = len1 + (len1 != 511 - j ? random () % (511 - j - len1) : 0);
 156       j = (pos > len2 ? pos : len2) + align1 + 64;
 157       if (j > 512)
 158         j = 512;
 159       for (i = 0; i < j; ++i)
 160         {
 161           p1[i] = random () & 255;
 162           if (i < len1 + align1 && !p1[i])
 163             {
 164               p1[i] = random () & 255;
 165               if (!p1[i])
 166                 p1[i] = 1 + (random () & 127);
 167             }
 168         }
 169       for (i = 0; i < j; ++i)
 170         {
 171           p2[i] = random () & 255;
 172           if (i < len2 + align2 && !p2[i])
 173             {
 174               p2[i] = random () & 255;
 175               if (!p2[i])
 176                 p2[i] = 1 + (random () & 127);
 177             }
 178         }
 179
 180       result = 0;
 181       memcpy (p2 + align2, p1 + align1, pos);
 182       if (pos < len1)
 183         {
 184           if (p2[align2 + pos] == p1[align1 + pos])
 185             {
 186               p2[align2 + pos] = random () & 255;
 187               if (p2[align2 + pos] == p1[align1 + pos])
 188                 p2[align2 + pos] = p1[align1 + pos] + 3 + (random () & 127);
 189             }
 190
 191           if (p1[align1 + pos] < p2[align2 + pos])
 192             result = -1;
 193           else
 194             result = 1;
 195         }
 196       p1[len1 + align1] = 0;
 197       p2[len2 + align2] = 0;
 198
 199       FOR_EACH_IMPL (impl, 1)
 200         {
 201           r = CALL (impl, (char *) (p1 + align1), (char *) (p2 + align2));
 202           /* Test whether on 64-bit architectures where ABI requires
 203              callee to promote has the promotion been done.  */
 204           asm ("" : "=g" (r) : "0" (r));
 205           if ((r == 0 && result)
 206               || (r < 0 && result >= 0)
 207               || (r > 0 && result <= 0))
 208             {
 209               error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd, %zd, %zd) %ld != %d, p1 %p p2 %p",
 210                      n, impl->name, align1, align2, len1, len2, pos, r, result, p1, p2);
 211               ret = 1;
 212             }
 213         }
 214     }
 215 }
 216
 217 int
 218 test_main (void)
 219 {
 220   size_t i;
 221
 222   test_init ();
 223
 224   printf ("%23s", "");
 225   FOR_EACH_IMPL (impl, 0)
 226     printf ("\t%s", impl->name);
 227   putchar ('\n');
 228
 229   for (i = 1; i < 16; ++i)
 230     {
 231       do_test (i, i, i, 127, 0);
 232       do_test (i, i, i, 127, 1);
 233       do_test (i, i, i, 127, -1);
 234     }
 235
 236   for (i = 1; i < 10; ++i)
 237     {
 238       do_test (0, 0, 2 << i, 127, 0);
 239       do_test (0, 0, 2 << i, 254, 0);
 240       do_test (0, 0, 2 << i, 127, 1);
 241       do_test (0, 0, 2 << i, 254, 1);
 242       do_test (0, 0, 2 << i, 127, -1);
 243       do_test (0, 0, 2 << i, 254, -1);
 244     }
 245
 246   for (i = 1; i < 8; ++i)
 247     {
 248       do_test (i, 2 * i, 8 << i, 127, 0);
 249       do_test (2 * i, i, 8 << i, 254, 0);
 250       do_test (i, 2 * i, 8 << i, 127, 1);
 251       do_test (2 * i, i, 8 << i, 254, 1);
 252       do_test (i, 2 * i, 8 << i, 127, -1);
 253       do_test (2 * i, i, 8 << i, 254, -1);
 254     }
 255
 256   do_random_tests ();
 257   return ret;
 258 }
 259
 260 #include "../test-skeleton.c"