benchtests/bench-strncasecmp.c

   1 /* Measure strncasecmp functions.
   2    Copyright (C) 2013 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <ctype.h>
  20 #define TEST_MAIN
  21 #define TEST_NAME "strncasecmp"
  22 #include "bench-string.h"
  23
  24 typedef int (*proto_t) (const char *, const char *, size_t);
  25 static int simple_strncasecmp (const char *, const char *, size_t);
  26 static int stupid_strncasecmp (const char *, const char *, size_t);
  27
  28 IMPL (stupid_strncasecmp, 0)
  29 IMPL (simple_strncasecmp, 0)
  30 IMPL (strncasecmp, 1)
  31
  32 static int
  33 simple_strncasecmp (const char *s1, const char *s2, size_t n)
  34 {
  35   int ret;
  36
  37   if (n == 0)
  38     return 0;
  39
  40   while ((ret = ((unsigned char) tolower (*s1)
  41                  - (unsigned char) tolower (*s2))) == 0
  42          && *s1++)
  43     {
  44       if (--n == 0)
  45         return 0;
  46       ++s2;
  47     }
  48   return ret;
  49 }
  50
  51 static int
  52 stupid_strncasecmp (const char *s1, const char *s2, size_t max)
  53 {
  54   size_t ns1 = strlen (s1) + 1;
  55   size_t ns2 = strlen (s2) + 1;
  56   size_t n = ns1 < ns2 ? ns1 : ns2;
  57   if (n > max)
  58     n = max;
  59   int ret = 0;
  60
  61   while (n--)
  62     {
  63       if ((ret = ((unsigned char) tolower (*s1)
  64                   - (unsigned char) tolower (*s2))) != 0)
  65         break;
  66       ++s1;
  67       ++s2;
  68     }
  69   return ret;
  70 }
  71
  72 static void
  73 do_one_test (impl_t *impl, const char *s1, const char *s2, size_t n,
  74              int exp_result)
  75 {
  76   if (HP_TIMING_AVAIL)
  77     {
  78       hp_timing_t start __attribute ((unused));
  79       hp_timing_t stop __attribute ((unused));
  80       hp_timing_t best_time = ~ (hp_timing_t) 0;
  81       size_t i;
  82
  83       for (i = 0; i < 32; ++i)
  84         {
  85           HP_TIMING_NOW (start);
  86           CALL (impl, s1, s2, n);
  87           HP_TIMING_NOW (stop);
  88           HP_TIMING_BEST (best_time, start, stop);
  89         }
  90
  91       printf ("\t%zd", (size_t) best_time);
  92     }
  93 }
  94
  95 static void
  96 do_test (size_t align1, size_t align2, size_t n, size_t len, int max_char,
  97          int exp_result)
  98 {
  99   size_t i;
 100   char *s1, *s2;
 101
 102   if (len == 0)
 103     return;
 104
 105   align1 &= 7;
 106   if (align1 + len + 1 >= page_size)
 107     return;
 108
 109   align2 &= 7;
 110   if (align2 + len + 1 >= page_size)
 111     return;
 112
 113   s1 = (char *) (buf1 + align1);
 114   s2 = (char *) (buf2 + align2);
 115
 116   for (i = 0; i < len; i++)
 117     {
 118       s1[i] = toupper (1 + 23 * i % max_char);
 119       s2[i] = tolower (s1[i]);
 120     }
 121
 122   s1[len] = s2[len] = 0;
 123   s1[len + 1] = 23;
 124   s2[len + 1] = 24 + exp_result;
 125   if ((s2[len - 1] == 'z' && exp_result == -1)
 126       || (s2[len - 1] == 'a' && exp_result == 1))
 127     s1[len - 1] += exp_result;
 128   else
 129     s2[len - 1] -= exp_result;
 130
 131   if (HP_TIMING_AVAIL)
 132     printf ("Length %4zd, alignment %2zd/%2zd:", len, align1, align2);
 133
 134   FOR_EACH_IMPL (impl, 0)
 135     do_one_test (impl, s1, s2, n, exp_result);
 136
 137   if (HP_TIMING_AVAIL)
 138     putchar ('\n');
 139 }
 140
 141 int
 142 test_main (void)
 143 {
 144   size_t i;
 145
 146   test_init ();
 147
 148   printf ("%23s", "");
 149   FOR_EACH_IMPL (impl, 0)
 150     printf ("\t%s", impl->name);
 151   putchar ('\n');
 152
 153   for (i = 1; i < 16; ++i)
 154     {
 155       do_test (i, i, i - 1, i, 127, 0);
 156
 157       do_test (i, i, i, i, 127, 0);
 158       do_test (i, i, i, i, 127, 1);
 159       do_test (i, i, i, i, 127, -1);
 160
 161       do_test (i, i, i + 1, i, 127, 0);
 162       do_test (i, i, i + 1, i, 127, 1);
 163       do_test (i, i, i + 1, i, 127, -1);
 164     }
 165
 166   for (i = 1; i < 10; ++i)
 167     {
 168       do_test (0, 0, (2 << i) - 1, 2 << i, 127, 0);
 169       do_test (0, 0, 2 << i, 2 << i, 254, 0);
 170       do_test (0, 0, (2 << i) + 1, 2 << i, 127, 0);
 171
 172       do_test (0, 0, (2 << i) + 1, 2 << i, 254, 0);
 173
 174       do_test (0, 0, 2 << i, 2 << i, 127, 1);
 175       do_test (0, 0, (2 << i) + 10, 2 << i, 127, 1);
 176
 177       do_test (0, 0, 2 << i, 2 << i, 254, 1);
 178       do_test (0, 0, (2 << i) + 10, 2 << i, 254, 1);
 179
 180       do_test (0, 0, 2 << i, 2 << i, 127, -1);
 181       do_test (0, 0, (2 << i) + 10, 2 << i, 127, -1);
 182
 183       do_test (0, 0, 2 << i, 2 << i, 254, -1);
 184       do_test (0, 0, (2 << i) + 10, 2 << i, 254, -1);
 185     }
 186
 187   for (i = 1; i < 8; ++i)
 188     {
 189       do_test (i, 2 * i, (8 << i) - 1, 8 << i, 127, 0);
 190       do_test (i, 2 * i, 8 << i, 8 << i, 127, 0);
 191       do_test (i, 2 * i, (8 << i) + 100, 8 << i, 127, 0);
 192
 193       do_test (2 * i, i, (8 << i) - 1, 8 << i, 254, 0);
 194       do_test (2 * i, i, 8 << i, 8 << i, 254, 0);
 195       do_test (2 * i, i, (8 << i) + 100, 8 << i, 254, 0);
 196
 197       do_test (i, 2 * i, 8 << i, 8 << i, 127, 1);
 198       do_test (i, 2 * i, (8 << i) + 100, 8 << i, 127, 1);
 199
 200       do_test (2 * i, i, 8 << i, 8 << i, 254, 1);
 201       do_test (2 * i, i, (8 << i) + 100, 8 << i, 254, 1);
 202
 203       do_test (i, 2 * i, 8 << i, 8 << i, 127, -1);
 204       do_test (i, 2 * i, (8 << i) + 100, 8 << i, 127, -1);
 205
 206       do_test (2 * i, i, 8 << i, 8 << i, 254, -1);
 207       do_test (2 * i, i, (8 << i) + 100, 8 << i, 254, -1);
 208     }
 209
 210   return ret;
 211 }
 212
 213 #include "../test-skeleton.c"