string/test-rawmemchr.c

   1 /* Test and measure memchr functions.
   2    Copyright (C) 1999,2002,2003,2005,2009,2011 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 #include <assert.h>
  21
  22 #define TEST_MAIN
  23 #include "test-string.h"
  24
  25 typedef char *(*proto_t) (const char *, int);
  26 char *simple_rawmemchr (const char *, int);
  27
  28 IMPL (simple_rawmemchr, 0)
  29 IMPL (rawmemchr, 1)
  30
  31 char *
  32 simple_rawmemchr (const char *s, int c)
  33 {
  34   while (1)
  35     if (*s++ == (char) c)
  36       return (char *) s - 1;
  37   return NULL;
  38 }
  39
  40 static void
  41 do_one_test (impl_t *impl, const char *s, int c, char *exp_res)
  42 {
  43   char *res = CALL (impl, s, c);
  44   if (res != exp_res)
  45     {
  46       error (0, 0, "Wrong result in function %s %p %p", impl->name,
  47              res, exp_res);
  48       ret = 1;
  49       return;
  50     }
  51
  52   if (HP_TIMING_AVAIL)
  53     {
  54       hp_timing_t start __attribute ((unused));
  55       hp_timing_t stop __attribute ((unused));
  56       hp_timing_t best_time = ~ (hp_timing_t) 0;
  57       size_t i;
  58
  59       for (i = 0; i < 32; ++i)
  60         {
  61           HP_TIMING_NOW (start);
  62           CALL (impl, s, c);
  63           HP_TIMING_NOW (stop);
  64           HP_TIMING_BEST (best_time, start, stop);
  65         }
  66
  67       printf ("\t%zd", (size_t) best_time);
  68     }
  69 }
  70
  71 static void
  72 do_test (size_t align, size_t pos, size_t len, int seek_char)
  73 {
  74   size_t i;
  75   char *result;
  76
  77   align &= 7;
  78   if (align + len >= page_size)
  79     return;
  80
  81   for (i = 0; i < len; ++i)
  82     {
  83       buf1[align + i] = 1 + 23 * i % 127;
  84       if (buf1[align + i] == seek_char)
  85         buf1[align + i] = seek_char + 1;
  86     }
  87   buf1[align + len] = 0;
  88
  89   assert (pos < len);
  90
  91   buf1[align + pos] = seek_char;
  92   buf1[align + len] = -seek_char;
  93   result = (char *) (buf1 + align + pos);
  94
  95   if (HP_TIMING_AVAIL)
  96     printf ("Length %4zd, alignment %2zd:", pos, align);
  97
  98   FOR_EACH_IMPL (impl, 0)
  99     do_one_test (impl, (char *) (buf1 + align), seek_char, result);
 100
 101   if (HP_TIMING_AVAIL)
 102     putchar ('\n');
 103 }
 104
 105 static void
 106 do_random_tests (void)
 107 {
 108   size_t i, j, n, align, pos, len;
 109   int seek_char;
 110   char *result;
 111   unsigned char *p = buf1 + page_size - 512;
 112
 113   for (n = 0; n < ITERATIONS; n++)
 114     {
 115       align = random () & 15;
 116       pos = random () & 511;
 117       if (pos + align >= 512)
 118         pos = 511 - align - (random () & 7);
 119       len = random () & 511;
 120       if (len + align >= 512)
 121         len = 512 - align - (random () & 7);
 122       if (pos >= len)
 123         continue;
 124       seek_char = random () & 255;
 125       j = len + align + 64;
 126       if (j > 512)
 127         j = 512;
 128
 129       for (i = 0; i < j; i++)
 130         {
 131           if (i == pos + align)
 132             p[i] = seek_char;
 133           else
 134             {
 135               p[i] = random () & 255;
 136               if (i < pos + align && p[i] == seek_char)
 137                 p[i] = seek_char + 13;
 138             }
 139         }
 140
 141       assert (pos < len);
 142       size_t r = random ();
 143       if ((r & 31) == 0)
 144         len = ~(uintptr_t) (p + align) - ((r >> 5) & 31);
 145       result = (char *) (p + pos + align);
 146
 147       FOR_EACH_IMPL (impl, 1)
 148         if (CALL (impl, (char *) (p + align), seek_char) != result)
 149           {
 150             error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %d, %zd, %zd) %p != %p, p %p",
 151                    n, impl->name, align, seek_char, len, pos,
 152                    CALL (impl, (char *) (p + align), seek_char),
 153                    result, p);
 154             ret = 1;
 155           }
 156     }
 157 }
 158
 159 int
 160 test_main (void)
 161 {
 162   size_t i;
 163
 164   test_init ();
 165
 166   printf ("%20s", "");
 167   FOR_EACH_IMPL (impl, 0)
 168     printf ("\t%s", impl->name);
 169   putchar ('\n');
 170
 171   for (i = 1; i < 7; ++i)
 172     {
 173       do_test (0, 16 << i, 2048, 23);
 174       do_test (i, 64, 256, 23);
 175       do_test (0, 16 << i, 2048, 0);
 176       do_test (i, 64, 256, 0);
 177     }
 178   for (i = 1; i < 32; ++i)
 179     {
 180       do_test (0, i, i + 1, 23);
 181       do_test (0, i, i + 1, 0);
 182     }
 183
 184   do_random_tests ();
 185   return ret;
 186 }
 187
 188 #include "../test-skeleton.c"