string/test-memset.c

   1 /* Test and measure memset functions.
   2    Copyright (C) 1999, 2002, 2003 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 #define MIN_PAGE_SIZE 131072
  23 #include "test-string.h"
  24
  25 typedef char *(*proto_t) (char *, int, size_t);
  26 char *simple_memset (char *, int, size_t);
  27 char *builtin_memset (char *, int, size_t);
  28
  29 IMPL (simple_memset, 0)
  30 IMPL (builtin_memset, 0)
  31 IMPL (memset, 1)
  32
  33 char *
  34 simple_memset (char *s, int c, size_t n)
  35 {
  36   char *r = s, *end = s + n;
  37   while (r < end)
  38     *r++ = c;
  39   return s;
  40 }
  41
  42 char *
  43 builtin_memset (char *s, int c, size_t n)
  44 {
  45   return __builtin_memset (s, c, n);
  46 }
  47
  48 static void
  49 do_one_test (impl_t *impl, char *s, int c, size_t n)
  50 {
  51   char *res = CALL (impl, s, c, n);
  52   if (res != s)
  53     {
  54       error (0, 0, "Wrong result in function %s %p != %p", impl->name,
  55              res, s);
  56       ret = 1;
  57       return;
  58     }
  59
  60   if (HP_TIMING_AVAIL)
  61     {
  62       hp_timing_t start __attribute ((unused));
  63       hp_timing_t stop __attribute ((unused));
  64       hp_timing_t best_time = ~ (hp_timing_t) 0;
  65       size_t i;
  66
  67       for (i = 0; i < 32; ++i)
  68         {
  69           HP_TIMING_NOW (start);
  70           CALL (impl, s, c, n);
  71           HP_TIMING_NOW (stop);
  72           HP_TIMING_BEST (best_time, start, stop);
  73         }
  74
  75       printf ("\t%zd", (size_t) best_time);
  76     }
  77 }
  78
  79 static void
  80 do_test (size_t align, int c, size_t len)
  81 {
  82   align &= 7;
  83   if (align + len > page_size)
  84     return;
  85
  86   if (HP_TIMING_AVAIL)
  87     printf ("Length %4zd, alignment %2zd, c %2d:", len, align, c);
  88
  89   FOR_EACH_IMPL (impl, 0)
  90     do_one_test (impl, buf1 + align, c, len);
  91
  92   if (HP_TIMING_AVAIL)
  93     putchar ('\n');
  94 }
  95
  96 static void
  97 do_random_tests (void)
  98 {
  99   size_t i, j, k, n, align, len, size;
 100   int c, o;
 101   unsigned char *p, *res;
 102
 103   for (i = 0; i < 65536; ++i)
 104     buf2[i] = random () & 255;
 105
 106   for (n = 0; n < ITERATIONS; n++)
 107     {
 108       if ((random () & 31) == 0)
 109         size = 65536;
 110       else
 111         size = 512;
 112       p = buf1 + page_size - size;
 113       len = random () & (size - 1);
 114       align = size - len - (random () & 31);
 115       if (align > size)
 116         align = size - len;
 117       if ((random () & 7) == 0)
 118         align &= ~63;
 119       if ((random () & 7) == 0)
 120         c = 0;
 121       else
 122         c = random () & 255;
 123       o = random () & 255;
 124       if (o == c)
 125         o = (c + 1) & 255;
 126       j = len + align + 128;
 127       if (j > size)
 128         j = size;
 129       if (align >= 128)
 130         k = align - 128;
 131       else
 132         k = 0;
 133       for (i = k; i < align; ++i)
 134         p[i] = o;
 135       for (i = align + len; i < j; ++i)
 136         p[i] = o;
 137
 138       FOR_EACH_IMPL (impl, 1)
 139         {
 140           for (i = 0; i < len; ++i)
 141             {
 142               p[i + align] = buf2[i];
 143               if (p[i + align] == c)
 144                 p[i + align] = o;
 145             }
 146           res = CALL (impl, p + align, c, len);
 147           if (res != p + align)
 148             {
 149               error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %d, %zd) %p != %p",
 150                      n, impl->name, align, c, len, res, p + align);
 151               ret = 1;
 152             }
 153           for (i = k; i < align; ++i)
 154             if (p[i] != o)
 155               {
 156                 error (0, 0, "Iteration %zd - garbage before %s (%zd, %d, %zd)",
 157                        n, impl->name, align, c, len);
 158                 ret = 1;
 159                 break;
 160               }
 161           for (; i < align + len; ++i)
 162             if (p[i] != c)
 163               {
 164                 error (0, 0, "Iteration %zd - not cleared correctly %s (%zd, %d, %zd)",
 165                        n, impl->name, align, c, len);
 166                 ret = 1;
 167                 break;
 168               }
 169           for (; i < j; ++i)
 170             if (p[i] != o)
 171               {
 172                 error (0, 0, "Iteration %zd - garbage after %s (%zd, %d, %zd)",
 173                        n, impl->name, align, c, len);
 174                 ret = 1;
 175                 break;
 176               }
 177         }
 178     }
 179 }
 180
 181 int
 182 test_main (void)
 183 {
 184   size_t i;
 185   int c;
 186
 187   test_init ();
 188
 189   printf ("%24s", "");
 190   FOR_EACH_IMPL (impl, 0)
 191     printf ("\t%s", impl->name);
 192   putchar ('\n');
 193
 194   for (c = 0; c <= 65; c += 65)
 195     {
 196       for (i = 0; i < 18; ++i)
 197         do_test (0, c, 1 << i);
 198       for (i = 1; i < 32; ++i)
 199         {
 200           do_test (i, c, i);
 201           if (i & (i - 1))
 202             do_test (0, c, i);
 203         }
 204       do_test (1, c, 14);
 205       do_test (3, c, 1024);
 206       do_test (4, c, 64);
 207       do_test (2, c, 25);
 208     }
 209
 210   do_random_tests ();
 211   return ret;
 212 }
 213
 214 #include "../test-skeleton.c"